pascalabcnet/CodeCompletion/DomSyntaxTreeVisitor.cs

// Copyright (c) Ivan Bondarev, Stanislav Mikhalkovich (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using PascalABCCompiler;
using PascalABCCompiler.Parsers;
using PascalABCCompiler.SyntaxTree;
using PascalABCCompiler.SyntaxTreeConverters;
using PascalABCCompiler.TreeRealization;
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;

namespace CodeCompletion
{
	
	public class DomSyntaxTreeVisitor : AbstractVisitor
    {
		private SymScope returned_scope;//vozvrashaemyj scope posle vyzova visit
        private Stack<SymScope> saved_returned_scopes = new Stack<SymScope>();//nuzhen dlja lambd
		private List<SymScope> returned_scopes = new List<SymScope>();//hranit spisok scopov (metodov) posle vyzova visit, esli search_all=true
        public SymScope entry_scope;//korenvoj scope unita
		public SymScope impl_scope;
		private string cur_type_name;
		private location cur_loc;
		private DomConverter converter;
		private bool is_proc_realization=false;
		private string meth_name;
		private string cur_unit_file_name;
        private Languages.Facade.ILanguage currentUnitLanguage;
		private RetValue cnst_val;
		private ExpressionEvaluator ev = new ExpressionEvaluator();
		public bool add_doc_from_text=true;
		private bool search_all = false;//flag, iskat vse peregruzki ili tolko odnu. sdelal dlja effektivnosti. true zadaetsja tolko v visit(method_call)
        internal bool parse_only_interface = false;
        private template_type_reference converted_template_type = null;
        private List<var_def_statement> pending_is_pattern_vars = new List<var_def_statement>();
        private static Compiler compiler;
        public static bool use_semantic_for_intellisense;
        private Dictionary<method_call, SymScope> method_call_cache = new Dictionary<method_call, SymScope>();
        public HashSet<Assembly> cur_used_assemblies;

        public DomSyntaxTreeVisitor(DomConverter converter)
		{
			//tcst = new TreeConverterSymbolTable(false);
			this.converter = converter;
		}

        public override void visit(default_operator node)
        {
        	node.type_name.visit(this);
        }

		public void Convert(compilation_unit cu)
        {
            method_call_cache.Clear();

            try
            {
				cu.visit(this);
            }
            catch(Exception e)
            {
#if DEBUG
                File.AppendAllText("log.txt", e.Message + Environment.NewLine + e.StackTrace + Environment.NewLine);
#endif
                //throw e;
            	//System.Diagnostics.Debug.WriteLine(e.StackTrace);
            }
            cur_used_assemblies = new HashSet<Assembly>(PascalABCCompiler.NetHelper.NetHelper.cur_used_assemblies);
            if (use_semantic_for_intellisense && !parse_only_interface)
            try
            {
                CorrectTreeWithSemantic(cu);
            }
            catch (Exception e)
            {
#if DEBUG
                File.AppendAllText("log.txt", e.Message + Environment.NewLine + e.StackTrace + Environment.NewLine);
#endif
            }
        }

        private type_definition BuildSyntaxNodeForTypeReference(type_node tn)
        {
            if (tn.instance_params != null && tn.instance_params.Count > 0)
            {
                var ttr = new template_type_reference();
                var ntr = new named_type_reference();
                ttr.name = ntr;
                ttr.params_list = new template_param_list();
                var arr = tn.original_generic.full_name.Split('.');
                for (int i = 0; i < arr.Length; i++)
                {
                    var s = arr[i];
                    if (i < arr.Length - 1)
                        ntr.names.Add(new ident(s));
                    else
                    {
                        var id = new ident_with_templateparams();
                        ntr.Add(new ident(s));
                        foreach (var gen_td in tn.instance_params)
                        {
                            if (gen_td.PrintableName.StartsWith("AnonymousType#"))
                            {
                                SymScope tmp = cur_scope;
                                TypeScope ts = null;
                                cur_scope = ts = new TypeScope(SymbolKind.Class, cur_scope, null);
                                tmp.AddName(gen_td.PrintableName, cur_scope);
                                ts.loc = get_location(gen_td.location);
                                ts.si = new SymInfo("class", SymbolKind.Class, "");
                                foreach (var prop in (gen_td as common_type_node).properties)
                                {
                                    ElementScope es = new ElementScope();
                                    es.si = new SymInfo(prop.name, SymbolKind.Property, "");
                                    BuildSyntaxNodeForTypeReference(prop.property_type).visit(this);
                                    es.sc = returned_scope;
                                    ts.AddName(prop.name, es);
                                }
                                returned_scope = cur_scope;
                                cur_scope = tmp;
                                ttr.params_list.Add(new named_type_reference(gen_td.PrintableName));
                            }
                            else
                                ttr.params_list.Add(BuildSyntaxNodeForTypeReference(gen_td));
                        }
                            
                    }
                }
                return ttr;
            }
            else
            {
                var ntr = new named_type_reference();
                if (tn.IsDelegate)
                {
                    var invokeMeth = tn.find_first_in_type("Invoke");
                    if (invokeMeth != null)
                    {
                        var fn = invokeMeth.sym_info as function_node;
                        procedure_header header;
                        if (fn.return_value_type != null)
                        {
                            header = new function_header(BuildSyntaxNodeForTypeReference(fn.return_value_type));
                        }
                        else
                        {
                            header = new procedure_header();
                        }
                        header.parameters = new formal_parameters();
                        foreach (var param in fn.parameters)
                        {
                            var tparam = new typed_parameters();
                            tparam.vars_type = BuildSyntaxNodeForTypeReference(param.type);
                            tparam.idents = new ident_list();
                            tparam.idents.Add(new ident(param.name));
                            header.parameters.Add(tparam);
                            
                        }
                        return header;
                    }
                    ntr.names.Add(new ident(tn.PrintableName.Replace("()", "")));
                    return ntr;
                }
                else if (tn.type_special_kind == PascalABCCompiler.SemanticTree.type_special_kind.array_kind)
                {
                    array_type arr_type = new array_type(null, BuildSyntaxNodeForTypeReference(tn.element_type));
                    return arr_type;
                }
                var arr = tn.full_name.Split('.');
                foreach (string s in arr)
                {
                    if (s.IndexOf("implementation__") == -1)
                        ntr.names.Add(new ident(s));
                }
                return ntr;
            }
        }

        private TypeScope GetIntellisenseTypeByType(Type t)
        {
            if (t.GetGenericArguments().Length == 0)
                return TypeTable.get_compiled_type(t);
            else
            {
                List<TypeScope> gen_args = new List<TypeScope>();
                foreach (var gen_tn in t.GetGenericArguments())
                {
                    gen_args.Add(TypeTable.get_compiled_type(gen_tn));
                }
                return CompiledScope.get_type_instance(t.GetGenericTypeDefinition(), gen_args);
            }
        }

        private TypeScope GetCorrectedType(TypeScope ts, type_node tn, SymScope topScope)
        {
            if (ts is TypeSynonim)
            {
                var corrected_type = GetCorrectedType((ts as TypeSynonim).actType, tn, topScope);
                if (!corrected_type.IsEqual((ts as TypeSynonim).actType))
                    return corrected_type;
                return ts;
            }
            else if (tn is compiled_type_node)
            {
                var ctn = tn as compiled_type_node;
                if (ctn.compiled_type.IsArray)
                {
                    if (ctn.rank > 1)
                        return new ArrayScope(GetIntellisenseTypeByType((ctn.element_type as compiled_type_node).compiled_type), new TypeScope[ctn.rank]);
                    return new ArrayScope(GetIntellisenseTypeByType((ctn.element_type as compiled_type_node).compiled_type), null);
                }
                if (ctn.compiled_type.GetGenericArguments().Length == 0)
                    return TypeTable.get_compiled_type(ctn.compiled_type);
                else
                {
                    List<TypeScope> gen_args = new List<TypeScope>();
                    foreach (var gen_tn in ctn.compiled_type.GetGenericArguments())
                    {
                        gen_args.Add(GetIntellisenseTypeByType(gen_tn));
                    }
                    return CompiledScope.get_type_instance(ctn.compiled_type.GetGenericTypeDefinition(), gen_args);
                }
            }
            else if (tn is ref_type_node && ts is PointerScope)
            {
                var corrected_type = GetCorrectedType((ts as PointerScope).elementType, tn.element_type, topScope);
                if (!corrected_type.IsEqual((ts as PointerScope).elementType))
                    return new PointerScope(corrected_type);
                return ts;
            }
            else
            {
                
                if (tn.full_name.IndexOf("$") != -1 && !tn.IsDelegate|| tn.full_name.IndexOf("#") != -1 && tn.full_name.IndexOf("AnonymousType#") == -1)
                    return ts;
                if (ts is FileScope && tn.type_special_kind == PascalABCCompiler.SemanticTree.type_special_kind.typed_file)
                    return ts;
                if (ts is FileScope && tn.type_special_kind == PascalABCCompiler.SemanticTree.type_special_kind.binary_file)
                    return ts;
                var ntr = BuildSyntaxNodeForTypeReference(tn);
                cur_scope = topScope;
                
                ntr.visit(this);
                if (returned_scope != null && returned_scope is TypeScope)
                {
                    var correctedType = returned_scope as TypeScope;
                    if (!correctedType.IsTypeStrictEqual(ts))
                        return correctedType;
                }
                else if (returned_scope != null && returned_scope is ProcScope)
                {
                    var procType = new ProcType(returned_scope as ProcScope);
                    if (!procType.IsEqual(ts))
                        return procType;
                }
                return ts;
            }
        }

        /*private TypeScope CreateTypeScopeBySemanticType(type_node tn)
        {
            if (tn is common_generic_instance_type_node)
            {
                var ts = new TypeScope();
                var gitn = tn as common_generic_instance_type_node;
                ts.gener
                foreach (var field in gitn.fields)
                {
                    ts.AddName(field.name, CreateTypeScopeBySemanticType(field.type));
                }
            }
            return null;
        }*/


        private void CorrectVariableType(var_definition_node vdn)
        {
            location loc = null;
            if (vdn is namespace_variable)
            {
                loc = (vdn as namespace_variable).loc;
            }
            else if (vdn is local_variable)
            {
                loc = (vdn as local_variable).loc;
            }
            else if (vdn is local_block_variable)
            {
                loc = (vdn as local_block_variable).loc;
            }
            if (loc == null)
                return;
            var es = FindScopeByLocation(loc.begin_line_num,loc.begin_column_num) as ElementScope;
            if (es != null)
            {
                es.sc = GetCorrectedType(es.sc as TypeScope, vdn.type, es.topScope);
                es.MakeDescription();
            }
        }


        private void CorrectTreeWithSemantic(compilation_unit cu)
        {
            var co = new CompilerOptions();
            co.SavePCU = false;
            co.GenerateCode = false;
            co.UnitSyntaxTree = cu;
            co.SourceFileName = cu.source_context.FileName;
            co.ForIntellisense = true;
            co.SaveDocumentation = false;
            //if (compiler == null)
                compiler = new Compiler();
            compiler.CompilerOptions = co;
            compiler.ClearAfterCompilation = false;
            compiler.Compile();
            foreach (var lv in compiler.CompiledVariables)
                CorrectVariableType(lv);
            
            compiler.ClearAll(/*false*/);
        }

		public SymScope FindScopeByLocation(int line, int col)
		{
			try
			{
				SymScope ss = entry_scope.FindScopeByLocation(line,col);
				if (ss != null) return ss;
				if (impl_scope != null) return impl_scope.FindScopeByLocation(line,col);
				//if (impl_scope != null) return impl_scope.FindScopeByLocation(line,col);
			}
			catch
			{
				
			}
			return null;
		}
		
        private void save_return_value()
        {
            saved_returned_scopes.Push(returned_scope);
        }

        private void restore_return_value()
        {
            returned_scope = saved_returned_scopes.Pop();
        }

        public override void visit(syntax_tree_node _syntax_tree_node)
        {
            throw new Exception("The method or operation is not implemented.");
        }
		
        private bool HasVariablesInBlock(statement_list _statement_list)
        {
        	foreach (statement stmt in _statement_list.subnodes)
        		if (stmt is var_statement) return true;
        	return false;
        }

        private bool has_lambdas(expression node)
        {
            if (node is function_lambda_definition)
                return true;
            else if (node is dot_node)
            {
                dot_node dn = node as dot_node;
                if (has_lambdas(dn.left))
                    return true;
                if (has_lambdas(dn.right))
                    return true;
            }
            else if (node is method_call)
            {
                method_call mc = node as method_call;
                if (has_lambdas(mc.dereferencing_value))
                    return true;
                if (mc.parameters != null)
                foreach (expression e in mc.parameters.expressions)
                {
                    if (has_lambdas(e))
                        return true;
                }
            }
            else if (node is new_expr)
            {
                new_expr ne = node as new_expr;
                if (ne.params_list != null)
                    foreach (expression e in ne.params_list.expressions)
                    {
                        if (has_lambdas(e))
                            return true;
                    }
            }
            else if (node is tuple_node)
            {
                tuple_node tn = node as tuple_node;
                foreach (expression e in tn.el.expressions)
                {
                    if (has_lambdas(e))
                        return true;
                }
            }
            else if (node is PascalABCCompiler.SyntaxTree.question_colon_expression)
            {
                PascalABCCompiler.SyntaxTree.question_colon_expression expr = node as PascalABCCompiler.SyntaxTree.question_colon_expression;
                if (has_lambdas(expr.ret_if_true))
                    return true;
                if (has_lambdas(expr.ret_if_false))
                    return true;
            }
            return false;
        }

        public override void visit(template_type_name node)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(statement_list _statement_list)
        {
        	SymScope tmp = cur_scope;
        	
        	if (HasVariablesInBlock(_statement_list))
        	{
        		SymScope stmt_scope = new BlockScope(cur_scope);
        		cur_scope.AddName("$block_scope",stmt_scope);
        		stmt_scope.loc = get_location(_statement_list);
        		cur_scope = stmt_scope;
            }
        	//try
        	{
        		foreach (statement stmt in _statement_list.subnodes)
        			stmt.visit(this);
        	}
        	//catch(Exception e)
        	{
        		
        	}
        	cur_scope = tmp;
        }

        public override void visit(expression _expression)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(assign _assign)
        {
            visit_is_patterns(_assign.from);
            if (pending_is_pattern_vars.Count > 0)
            {
                foreach (var_def_statement vds in pending_is_pattern_vars)
                    vds.visit(this);
                pending_is_pattern_vars.Clear();
            }
            if (_assign.from is function_lambda_definition)
            {
                _assign.to.visit(this);
                TypeScope tmp_awaitedProcType = awaitedProcType;
                if (returned_scope != null && returned_scope is TypeScope)
                {
                    if (returned_scope is ProcScope)
                        returned_scope = new ProcType(returned_scope as ProcScope);
                    awaitedProcType = returned_scope as TypeScope;
                }
                _assign.from.visit(this);
                awaitedProcType = tmp_awaitedProcType;
            }
            else if (has_lambdas(_assign.from))
                _assign.from.visit(this);
            else if (_assign.to is ident && cur_scope != null && cur_scope.Name.StartsWith("<>lambda")
                && (_assign.to as ident).name.Equals(currentUnitLanguage.LanguageInformation.ResultVariableName, currentUnitLanguage.CaseSensitive ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase))
            {
                var sc = cur_scope.FindNameOnlyInThisType(currentUnitLanguage.LanguageInformation.ResultVariableName);
                if (sc is ElementScope)
                {
                    ElementScope es = sc as ElementScope;
                    if (es.sc is TypeScope && (es.sc as TypeScope).IsDelegate)
                    {
                        _assign.from.visit(this);
                        (cur_scope as ProcScope).return_type = returned_scope as TypeScope;
                        es.sc = returned_scope;
                        es.MakeDescription();
                    }
                }
            }
        }

        public override void visit(bin_expr _bin_expr)
        {
            try
            {
                _bin_expr.left.visit(this);
                RetValue left = cnst_val;
                TypeScope tleft = returned_scope as TypeScope;
                cnst_val.prim_val = null;
                _bin_expr.right.visit(this);
                TypeScope tright = returned_scope as TypeScope;
                RetValue right = cnst_val;
                cnst_val.prim_val = null;
                if (left.prim_val != null && right.prim_val != null)
                {
                    ev.eval_stack.Push(left);
                    ev.eval_stack.Push(right);
                    switch (_bin_expr.operation_type)
                    {
                        case Operators.Plus: ev.EvalPlus(); break;
                        case Operators.Minus: ev.EvalMinus(); break;
                        case Operators.Multiplication: ev.EvalMult(); break;
                        case Operators.Division: ev.EvalDiv(); break;
                        case Operators.IntegerDivision: ev.EvalIDiv(); break;
                        case Operators.BitwiseAND: ev.EvalAnd(); break;
                        case Operators.BitwiseOR: ev.EvalOr(); break;
                        case Operators.BitwiseXOR: ev.EvalXor(); break;
                        case Operators.BitwiseLeftShift: ev.EvalBitwiseLeft(); break;
                        case Operators.BitwiseRightShift: ev.EvalBitwiseRight(); break;
                        case Operators.Equal: ev.EvalEqual(); break;
                        case Operators.NotEqual: ev.EvalNotEqual(); break;
                        case Operators.Less: ev.EvalLess(); break;
                        case Operators.LessEqual: ev.EvalLessEqual(); break;
                        case Operators.Greater: ev.EvalGreater(); break;
                        case Operators.GreaterEqual: ev.EvalGreaterEqual(); break;
                        case Operators.LogicalAND: ev.EvalAnd(); break;
                        case Operators.LogicalOR: ev.EvalOr(); break;
                        case Operators.ModulusRemainder: ev.EvalRem(); break;
                        default:
                            ev.eval_stack.Clear();
                            break;
                    }
                    if (ev.eval_stack.Count > 0)
                    {
                        cnst_val = ev.eval_stack.Pop();
                        returned_scope = TypeTable.get_type(cnst_val.prim_val);
                    }
                    else
                    {
                        cnst_val.prim_val = null;

                    }
                }
                else
                {
                    cnst_val.prim_val = null;
                }

                if (tleft != null && tright != null)
                {
                    RetValue tmp = cnst_val;
                    string name = PascalABCCompiler.TreeConverter.name_reflector.get_name(_bin_expr.operation_type);
                    List<SymScope> lst = tleft.FindOverloadNamesOnlyInType(name);
                    List<SymScope> lst_right = tright.FindOverloadNamesOnlyInType(name);
                    if (lst.Count == 0 && !char.IsLetter(name[0]))
                        lst = tleft.FindOverloadNamesOnlyInType("operator" + name);
                    if (lst_right.Count == 0 && !char.IsLetter(name[0]))
                        lst_right = tright.FindOverloadNamesOnlyInType("operator" + name);
                    if (!char.IsLetter(name[0]))
                        name = "operator" + name;
                    else
                        name = "operator " + name;
                    List<ProcScope> meths = entry_scope.GetExtensionMethods(name, tleft);
                    foreach (ProcScope meth in meths)
                        lst.Add(meth);
                    lst.AddRange(lst_right);
                    meths = entry_scope.GetExtensionMethods(name, tright);
                    foreach (ProcScope meth in meths)
                        lst.Add(meth);
                    ProcScope ps = select_method(lst.ToArray(), tleft, tright, null, false, null, _bin_expr.left, _bin_expr.right);
                    if (ps != null)
                        returned_scope = ps.return_type;
                    else
                    {
                        if (_bin_expr.operation_type == Operators.Division)
                            returned_scope = TypeTable.real_type;
                        else
                            returned_scope = tleft;
                    }
                        
                    cnst_val = tmp;
                }
                else if (tleft != null)
                    returned_scope = tleft;
                else
                    returned_scope = tright;
            }
            catch (Exception e)
            {
#if DEBUG
                File.AppendAllText("log.txt", e.Message + Environment.NewLine + e.StackTrace + Environment.NewLine);
#endif
                cnst_val.prim_val = null;
                ev.eval_stack.Clear();
                returned_scope = null;
            }

        }

        public override void visit(un_expr _un_expr)
        {
            try
            {
                _un_expr.subnode.visit(this);
                TypeScope tleft = returned_scope as TypeScope;
                if (cnst_val.prim_val != null)
                {
                    ev.eval_stack.Push(cnst_val);
                    switch (_un_expr.operation_type)
                    {
                        case Operators.BitwiseNOT:
                            ev.EvalNot(); break;
                        case Operators.LogicalNOT:
                            ev.EvalNot(); returned_scope = entry_scope.FindName(StringConstants.bool_type_name); break;
                        case Operators.Minus:
                            ev.EvalUnmin(); break;
                    }
                    if (ev.eval_stack.Count > 0)
                    {
                        cnst_val = ev.eval_stack.Pop();
                        returned_scope = TypeTable.get_type(cnst_val.prim_val);
                    }
                    else
                    {
                        cnst_val.prim_val = null;
                        returned_scope = tleft;
                    }
                }
            }
            catch (Exception e)
            {
                cnst_val.prim_val = null;
                ev.eval_stack.Clear();
                returned_scope = null;
            }
			
        }

        public override void visit(token_taginfo node)
        {
        }
        public override void visit(declaration_specificator node)
        {
        }


        public override void visit(const_node _const_node)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(bool_const _bool_const)
        {
            returned_scope = TypeTable.bool_type;//entry_scope.FindName(StringConstants.bool_type_name);
            cnst_val.prim_val = _bool_const.val;
        }

        public override void visit(int32_const _int32_const)
        {
        	returned_scope = TypeTable.int_type;//entry_scope.FindName(StringConstants.integer_type_name);
        	cnst_val.prim_val = _int32_const.val;
        }

        public override void visit(double_const _double_const)
        {
            returned_scope = TypeTable.real_type;//entry_scope.FindName(StringConstants.real_type_name);
            cnst_val.prim_val = _double_const.val;
        }

        public override void visit(statement _statement)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(subprogram_body _subprogram_body)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(ident _ident)
        {
            if (!search_all)
            {
                returned_scope = cur_scope.FindName(_ident.name);
                if (returned_scope == null)
                {
                    //cnst_val.prim_val = _ident.name;
                    cnst_val.prim_val = null;
                    return;
                }
                if (returned_scope is ElementScope)
                {
                    ElementScope es = returned_scope as ElementScope;
                    cnst_val.prim_val = es.cnst_val;
                    returned_scope = es.sc;
                    if (es.IsIndexedProperty)
                        returned_scope = new IndexedPropertyType(es.sc as TypeScope);
                    return;
                }
                else
                    if (returned_scope is ProcScope)
                {
                    ProcScope ps = returned_scope as ProcScope;
                    if (ps.parameters.Count == 0 || ps.parameters[0].param_kind == parametr_kind.params_parametr || ps.parameters[0].cnst_val != null)
                    {
                        if (ps.return_type != null)
                            returned_scope = ps.return_type;
                        else
                            returned_scope = new ProcType(ps);
                    }
                    else
                    {
                        returned_scopes = cur_scope.FindOverloadNames(_ident.name);
                        returned_scope = returned_scopes.Find(x => x is ProcScope && ((x as ProcScope).parameters.Count == 0 || (x as ProcScope).parameters[0].param_kind == parametr_kind.params_parametr || (x as ProcScope).parameters[0].cnst_val != null));
                        if (returned_scope == null)
                        {
                            returned_scope = returned_scopes[0];
                            if (returned_scope is ProcScope && (returned_scope as ProcScope).return_type == null)
                                returned_scope = new ProcType(returned_scope as ProcScope);
                        }
                        else if (returned_scope is ProcScope && (returned_scope as ProcScope).return_type != null)
                            returned_scope = (returned_scope as ProcScope).return_type;
                        else if (returned_scopes.Count > 0 && returned_scopes[0] is ProcScope && (returned_scopes[0] as ProcScope).return_type == null)
                            returned_scope = new ProcType(returned_scopes[0] as ProcScope);
                    }
                }
                else if (returned_scope is TypeScope)
                    is_type = true;
            }
            else
            {
                returned_scopes = cur_scope.FindOverloadNames(_ident.name);
                for (int i = 0; i < returned_scopes.Count; i++)
                {
                    if (returned_scopes[i] is ElementScope)
                    {
                        cnst_val.prim_val = (returned_scopes[i] as ElementScope).cnst_val;
                        returned_scope = (returned_scopes[i] as ElementScope).sc;
                        returned_scopes[i] = returned_scope;
                        return;
                    }
                    else
                    if (returned_scopes[i] is TypeScope)
                    {
                        is_type = true;
                    }
                }
                search_all = false;
            }
            //cnst_val.prim_val = _ident.name;
        }

        public override void visit(addressed_value _addressed_value)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(type_definition _type_definition)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(named_type_reference _named_type_reference)
        {
            //throw new Exception("The method or operation is not implemented.");
            returned_scope = cur_scope;
            string suffix = "";
            SymScope tmp_scope = returned_scope;
            for (int i = 0; i < _named_type_reference.names.Count; i++)
            {
                if (i == _named_type_reference.names.Count - 1 && converted_template_type != null)
                    suffix = "`" + converted_template_type.params_list.params_list.Count;
                if (i > 0)
                    returned_scope = returned_scope.FindNameOnlyInType(_named_type_reference.names[i].name+suffix);
                else
                    returned_scope = returned_scope.FindName(_named_type_reference.names[i].name+suffix);
                if (returned_scope == null)
                {
                    if (suffix != "")
                    {
                        returned_scope = tmp_scope;
                        if (i > 0)
                            returned_scope = returned_scope.FindNameOnlyInType(_named_type_reference.names[i].name);
                        else
                            returned_scope = returned_scope.FindName(_named_type_reference.names[i].name);
                        if (returned_scope == null)
                        {
                            break;
                        }
                    }
                    else
                        break;
                }
                tmp_scope = returned_scope;
            }

            if (returned_scope == null || !(returned_scope is TypeScope))
                returned_scope = new UnknownScope(new SymInfo(_named_type_reference.names[_named_type_reference.names.Count - 1].name, SymbolKind.Type, _named_type_reference.names[_named_type_reference.names.Count - 1].name));
        }

        public override void visit(variable_definitions _variable_definitions)
        {
            bool is_event = false;
            foreach (var_def_statement vds in _variable_definitions.var_definitions)
            {
                if (vds.is_event && !is_event)
                    is_event = true;
                else if (is_event)
                    vds.is_event = true;
                vds.visit(this);
            }
        }

        public override void visit(ident_list _ident_list)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public System.Collections.Hashtable vars = new System.Collections.Hashtable();
        private TypeScope awaitedProcType;

        public override void visit(var_def_statement _var_def_statement)
        {
            try
            {
                returned_scope = null;
                if (_var_def_statement.vars_type != null)
                    _var_def_statement.vars_type.visit(this);
                if (_var_def_statement.vars_type == null && _var_def_statement.inital_value != null || _var_def_statement.inital_value is function_lambda_definition)
                {
                    SymScope tmp_scope = returned_scope;
                    TypeScope tmp_awaitedProcType = awaitedProcType;
                    if (_var_def_statement.inital_value is function_lambda_definition)
                    {
                        if (tmp_scope is ProcScope)
                            tmp_scope = new ProcType(tmp_scope as ProcScope);
                        awaitedProcType = tmp_scope as TypeScope;
                    }

                    _var_def_statement.inital_value.visit(this);
                    awaitedProcType = tmp_awaitedProcType;
                    if (tmp_scope != null && _var_def_statement.inital_value is function_lambda_definition)
                        returned_scope = tmp_scope;
                }
                // if (si == null) dn = compiled_type_node.get_type_node(PascalABCCompiler.NetHelper.NetHelper.FindType((_var_def_statement.vars_type as named_type_reference).names[0].name,unl));

                //if (returned_scope == null) return;
                if (returned_scope is ProcScope)
                {
                    returned_scope = new ProcType(returned_scope as ProcScope);
                }

                if (_var_def_statement.vars != null)
                    foreach (ident s in _var_def_statement.vars.idents)
                    {
                        SymInfo si = new SymInfo(s.name, SymbolKind.Variable, s.name);
                        if (cur_scope is TypeScope) si.kind = SymbolKind.Field;
                        if (_var_def_statement.is_event) si.kind = SymbolKind.Event;
                        if (returned_scope == null && false)
                            returned_scope = new UnknownScope(new SymInfo("",SymbolKind.Class, ""));
                        ElementScope es = new ElementScope(si, returned_scope, cur_scope);
                        if (add_doc_from_text && this.converter.controller.docs != null && this.converter.controller.docs.ContainsKey(_var_def_statement))
                            es.AddDocumentation(this.converter.controller.docs[_var_def_statement]);
                        es.acc_mod = cur_access_mod;
                        es.is_static = _var_def_statement.var_attr == definition_attribute.Static;
                        es.si.acc_mod = cur_access_mod;
                        es.loc = get_location(s);
                        cur_scope.AddName(s.name, es);
                        es.declaringUnit = cur_scope;
                    }
            }
            catch (Exception e)
            {
#if DEBUG
                File.AppendAllText("log.txt", e.Message + Environment.NewLine + e.StackTrace + Environment.NewLine);
#endif
            }
        }
		
        public document doc;

        public location get_location(SourceContext sc)
        {
            if (sc == null)
            {
                return null;
            }
            return new location(sc.begin_position.line_num, sc.begin_position.column_num,
                sc.end_position.line_num, sc.end_position.column_num, doc);
        }


        public location get_location(syntax_tree_node tn)
		{
			if (tn.source_context==null)
			{
				return null;
			}
			return new location(tn.source_context.begin_position.line_num,tn.source_context.begin_position.column_num,
				tn.source_context.end_position.line_num,tn.source_context.end_position.column_num,doc);
		}
        
        public override void visit(declaration _declaration)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(declarations _declarations)
        {
            //throw new Exception("The method or operation is not implemented.");
            foreach (declaration decl in _declarations.defs)
            	decl.visit(this);
        }

        public override void visit(program_tree _program_tree)
        {
            
        }

        public override void visit(program_name _program_name)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(string_const _string_const)
        {
            returned_scope = TypeTable.string_type;//entry_scope.FindName(StringConstants.string_type_name);
            //cnst_val.prim_val = "'"+_string_const.Value+"'";
        	cnst_val.prim_val = this.converter.controller.Parser.LanguageInformation.GetStringForString(_string_const.Value);
        }

        public override void visit(expression_list _expression_list)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(dereference _dereference)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(roof_dereference _roof_dereference)
        {
            //throw new Exception("The method or operation is not implemented.");
            _roof_dereference.dereferencing_value.visit(this);
            TypeScope ts = returned_scope as TypeScope;
            while (ts is TypeSynonim)
                ts = (ts as TypeSynonim).actType;
            if (ts is PointerScope)
            	returned_scope = (ts as PointerScope).ref_type;
            else returned_scope = null;
        }

        public override void visit(indexer _indexer)
        {
            //throw new Exception("The method or operation is not implemented.");
            _indexer.dereferencing_value.visit(this);
            if (returned_scope != null && returned_scope is TypeScope)
            {
                TypeScope ts = returned_scope as TypeScope;
                if (ts is IndexedPropertyType)
                    returned_scope = (ts as IndexedPropertyType).propertyType;
                else if (ts.GetFullName() != null && (ts.GetFullName().IndexOf("System.Tuple") == 0 || ts.original_type != null && ts.original_type.GetFullName() != null && ts.original_type.GetFullName().IndexOf("(T1,") == 0))
                {
                    if (_indexer.indexes.expressions[0] is int32_const)
                    {
                        if ((_indexer.indexes.expressions[0] as int32_const).val >= 0)
                        {
                            dot_node dn = new dot_node(_indexer.dereferencing_value, new ident("Item" + ((_indexer.indexes.expressions[0] as int32_const).val + 1)));
                            dn.visit(this);
                        }
                        else
                            returned_scope = null;
                    }
                    else
                        returned_scope = null;
                }
                else if (returned_scope.GetElementType() != null)
                    returned_scope = returned_scope.GetElementType();
            	    
            }
        }

        public override void visit(PascalABCCompiler.SyntaxTree.for_node _for_node)
        {
            //throw new Exception("The method or operation is not implemented.");
            SymScope tmp = cur_scope;
            //if (_for_node.type_name != null)
            {
                SymScope stmt_scope = new BlockScope(cur_scope);
                cur_scope.AddName("$block_scope", stmt_scope);
                stmt_scope.loc = get_location(_for_node);
                returned_scope = null;
                if (_for_node.type_name != null)
                    _for_node.type_name.visit(this);
                if (returned_scope != null)
                {
                    cur_scope = stmt_scope;
                    ElementScope es = new ElementScope(new SymInfo(_for_node.loop_variable.name, SymbolKind.Variable, _for_node.loop_variable.name), returned_scope, cur_scope);
                    stmt_scope.AddName(_for_node.loop_variable.name, es);
                    es.loc = get_location(_for_node.loop_variable);
                    returned_scope = null;
                }
                else
                {
                    _for_node.initial_value.visit(this);
                    if (returned_scope != null)
                    {
                        cur_scope = stmt_scope;
                        if (_for_node.create_loop_variable)
                        {
                            ElementScope es = new ElementScope(new SymInfo(_for_node.loop_variable.name, SymbolKind.Variable, _for_node.loop_variable.name), returned_scope, cur_scope);
                            stmt_scope.AddName(_for_node.loop_variable.name, es);
                            es.loc = get_location(_for_node.loop_variable);
                        }
                        returned_scope = null;
                    }
                }
            }
            if (_for_node.statements != null)
                _for_node.statements.visit(this);
            cur_scope = tmp;
        }

        public override void visit(PascalABCCompiler.SyntaxTree.repeat_node _repeat_node)
        {
            if (_repeat_node.statements != null)
                _repeat_node.statements.visit(this);
        }

        public override void visit(PascalABCCompiler.SyntaxTree.while_node _while_node)
        {
            if (_while_node.statements != null)
                _while_node.statements.visit(this);
        }

        public override void visit(is_pattern_expr _is_pattern_expr)
        {
            _is_pattern_expr.right.visit(this);
        }

        public override void visit(deconstructor_pattern _deconstructor_pattern)
        {
            _deconstructor_pattern.type.visit(this);
            if (_deconstructor_pattern.parameters.Count == 1)
            {
                var pdp = _deconstructor_pattern.parameters[0];
                if (pdp is var_deconstructor_parameter)
                {
                    var_deconstructor_parameter vdp = pdp as var_deconstructor_parameter;
                    pending_is_pattern_vars.Add(new var_def_statement(vdp.identifier, _deconstructor_pattern.type, _deconstructor_pattern.source_context));
                }
            }
            else
            {
                foreach (pattern_parameter pdp in _deconstructor_pattern.parameters)
                {
                    if (pdp is var_deconstructor_parameter)
                    {
                        var_deconstructor_parameter vdp = pdp as var_deconstructor_parameter;
                        SymScope ss = returned_scope.FindName(vdp.identifier.name);
                        if (ss is ElementScope)
                        {
                            TypeScope ts = (ss as ElementScope).sc as TypeScope;
                            pending_is_pattern_vars.Add(new var_def_statement(vdp.identifier, new named_type_reference(new ident(ts.si.name)), _deconstructor_pattern.source_context));
                        }
                            
                    }
                }
            }
            
        }

        public override void visit(match_with _match_with)
        {
            if (_match_with.case_list != null)
            {
                foreach (pattern_case pc in _match_with.case_list.elements)
                    pc.visit(this);
            }
           
        }

        public override void visit(pattern_case _pattern_case)
        {
            _pattern_case.pattern.visit(this);
            statement stmt = merge_with_is_variables(_pattern_case.case_action);
            stmt.visit(this);
        }

        public void visit_is_patterns(expression expr)
        {
            if (expr is bin_expr)
            {
                bin_expr bexpr = expr as bin_expr;
                visit_is_patterns(bexpr.left);
                visit_is_patterns(bexpr.right);
            }
            else if (expr is is_pattern_expr)
                expr.visit(this);
        }

        public statement merge_with_is_variables(statement stmt)
        {
            if (pending_is_pattern_vars.Count > 0)
            {
                if (stmt is statement_list)
                {
                    foreach (var_def_statement vds in pending_is_pattern_vars)
                        (stmt as statement_list).Insert(0, new var_statement(vds, vds.source_context));
                }
                else
                {
                    statement_list slist = new statement_list();
                    slist.source_context = stmt.source_context;
                    foreach (var_def_statement vds in pending_is_pattern_vars)
                    {
                        slist.Insert(0, new var_statement(vds, vds.source_context));
                        if (slist.source_context == null)
                            slist.source_context = vds.source_context;
                    }   
                    slist.Add(stmt);
                    stmt = slist;
                }
                pending_is_pattern_vars.Clear();
            }
            return stmt;
        }

        public override void visit(PascalABCCompiler.SyntaxTree.if_node _if_node)
        {
            visit_is_patterns(_if_node.condition);
            statement then_stmt = _if_node.then_body;
            if (pending_is_pattern_vars.Count > 0 && then_stmt != null)
            {
                statement_list slist = new statement_list();
                if (_if_node.then_body.source_context != null)
                    slist.source_context = new SourceContext(_if_node.source_context.LeftSourceContext, _if_node.then_body.source_context.RightSourceContext);
                else if (_if_node.else_body != null && _if_node.else_body.source_context != null)
                    slist.source_context = new SourceContext(_if_node.source_context.LeftSourceContext, _if_node.else_body.source_context.LeftSourceContext);
                else
                    slist.source_context = _if_node.source_context;
                slist.Add(then_stmt);
                then_stmt = merge_with_is_variables(slist);
            }
            if (then_stmt != null)
                then_stmt.visit(this);
            if (_if_node.else_body != null)
                _if_node.else_body.visit(this);
        }

        public override void visit(ref_type _ref_type)
        {
            //throw new Exception("The method or operation is not implemented.");
            _ref_type.pointed_to.visit(this);
            if (returned_scope != null && returned_scope is TypeScope)
            {
            	returned_scope = new PointerScope(returned_scope as TypeScope);
            	returned_scope.loc = get_location(_ref_type);
            }
            else 
            {
            	returned_scope = new PointerScope();
            	returned_scope.loc = get_location(_ref_type);
            }
            returned_scope.topScope = cur_scope;
        }

        public override void visit(diapason _diapason)
        {
            object left = null, right = null;
            
            try
            {
            	_diapason.left.visit(this);
            	left = cnst_val.prim_val;
            	cnst_val.prim_val = null;
            	_diapason.right.visit(this);
            	right = cnst_val.prim_val;
            }
            catch (Exception e)
            {
            	
            }
            if (left != null && right != null)
            {
            	returned_scope = new DiapasonScope(left, right);
            	returned_scope.loc = get_location(_diapason);
            	returned_scope.topScope = cur_scope;
            }
            else returned_scope = null;
        }

        public override void visit(indexers_types _indexers_types)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(array_type _array_type)
        {
            //throw new Exception("The method or operation is not implemented.");
            _array_type.elements_type.visit(this);
            if (returned_scope == null) return;
           	SymScope of_type = returned_scope;
            List<TypeScope> indexes = new List<TypeScope>();
            if (_array_type.indexers != null)
            {
            	foreach (type_definition td in _array_type.indexers.indexers)
            	{
            		if (td != null)
            		{
            			td.visit(this);
            			if (returned_scope != null) indexes.Add((TypeScope)returned_scope);
            			else
            			{
            				returned_scope = null;
            				return;
            			}
            		}
            		else
            			indexes.Add(null);
            	}
            }
            else indexes.Add((TypeScope)entry_scope.FindName(StringConstants.integer_type_name));
            TypeScope ts = of_type as TypeScope;
            if (of_type is ProcScope)
                ts = new ProcType(of_type as ProcScope);
            returned_scope = new ArrayScope(ts as TypeScope,indexes.ToArray());
            returned_scope.topScope = cur_scope;
            if (_array_type.indexers == null) (returned_scope as ArrayScope).is_dynamic_arr = true;
            returned_scope.loc = get_location(_array_type);
        }

        public override void visit(label_definitions _label_definitions)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(procedure_attribute _procedure_attribute)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(typed_parameters _typed_parametres)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(formal_parameters _formal_parametres)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(procedure_attributes_list _procedure_attributes_list)
        {
            throw new Exception("The method or operation is not implemented.");
        }
		
        private bool IsForward(procedure_header hdr)
        {
        	if (hdr.proc_attributes == null) return false;
        	for (int i=0; i<hdr.proc_attributes.proc_attributes.Count; i++)
        		if (hdr.proc_attributes.proc_attributes[i].attribute_type == proc_attribute.attr_forward)
        		return true;
        	return false;
        }
        
        private bool IsForward(function_header hdr)
        {
        	if (hdr.proc_attributes == null) return false;
        	for (int i=0; i<hdr.proc_attributes.proc_attributes.Count; i++)
        		if (hdr.proc_attributes.proc_attributes[i].attribute_type == proc_attribute.attr_forward)
        		return true;
        	return false;
        }
        
        private bool IsStatic(procedure_attributes_list attrs)
        {
        	if (attrs == null) return false;
        	for (int i=0; i<attrs.proc_attributes.Count; i++)
        		if (attrs.proc_attributes[i].attribute_type == proc_attribute.attr_static)
        		return true;
        	return false;
        }

        private void SetAttributes(ProcScope ps, procedure_attributes_list attrs)
        {
            if (attrs == null) return;
            for (int i = 0; i < attrs.proc_attributes.Count; i++)
                if (attrs.proc_attributes[i].attribute_type == proc_attribute.attr_static)
                    ps.is_static = true;
                else if (attrs.proc_attributes[i].attribute_type == proc_attribute.attr_virtual)
                    ps.is_virtual = true;
                else if (attrs.proc_attributes[i].attribute_type == proc_attribute.attr_abstract)
                {
                    ps.is_abstract = true;
                    if (ps.topScope is TypeScope)
                        (ps.topScope as TypeScope).is_abstract = true;
                }  
                else if (attrs.proc_attributes[i].attribute_type == proc_attribute.attr_override)
                    ps.is_override = true;
                else if (attrs.proc_attributes[i].attribute_type == proc_attribute.attr_reintroduce)
                    ps.is_reintroduce = true;
        }

        private ProcScope select_function_definition(ProcScope ps, formal_parameters prms, TypeScope return_type, TypeScope declType, bool function=false, bool static_constructor=false)
        {
            SymScope tmp = returned_scope;
            List<ElementScope> lst = new List<ElementScope>();
            if (prms != null)
            {
                foreach (typed_parameters pars in prms.params_list)
                {
                    pars.vars_type.visit(this);

                    if (returned_scope != null)
                    {
                        foreach (ident id in pars.idents.idents)
                        {
                            if (returned_scope is ProcScope)
                                returned_scope = new ProcType(returned_scope as ProcScope);
                            ElementScope si = new ElementScope(new SymInfo(id.name, SymbolKind.Parameter, id.name), returned_scope, ps);
                            si.loc = get_location(id);
                            si.param_kind = pars.param_kind;
                            if (pars.inital_value != null)
                            {
                                cnst_val.prim_val = null;
                                if (pars.inital_value is nil_const)
                                    si.cnst_val = "nil";
                                else
                                {
                                    pars.inital_value.visit(this);
                                    if (cnst_val.prim_val != null)
                                        si.cnst_val = cnst_val.prim_val;
                                    else
                                        si.cnst_val = pars.inital_value.ToString();
                                }
                                    
                            }
                            lst.Add(si);
                        }
                    }
                }
                while (ps != null)
                {
                    if (ps.parameters != null)
                    {
                        if (ps.parameters.Count == lst.Count)
                        {
                            bool eq = true;
                            for (int i = 0; i < lst.Count; i++)
                            {
                                TypeScope left = ps.parameters[i].sc as TypeScope;
                                TypeScope right = lst[i].sc as TypeScope;
                                if (!left.IsEqual(right) || ps.parameters[i].param_kind != lst[i].param_kind)
                                {
                                    eq = false;
                                    break;
                                }
                            }
                            if (eq)
                            {
                                if (return_type == null) return ps;
                                if (ps.return_type != null && return_type != null)
                                {
                                    if ((ps.return_type as TypeScope).IsEqual(return_type))
                                        return ps;
                                }
                            }
                        }
                    }
                    ps = ps.nextProc;
                }
            }
            else
            {
                while (ps != null)
                {
                    if (ps.is_constructor && ps.is_static != static_constructor)
                    {
                        ps = ps.nextProc;
                        continue;
                    }
                    else if (ps.is_constructor && ps.is_static && static_constructor)
                    {
                        return ps;
                    }
                    if (ps.parameters == null || ps.parameters.Count == 0)
                    {
                        if (function && ps.return_type != null && return_type == null)
                            return ps;
                        if (ps.return_type == null && return_type == null)
                            return ps;
                        if (ps.return_type != null && return_type != null)
                        {
                            if ((ps.return_type as TypeScope).IsEqual(return_type))
                                return ps;
                        }
                        else
                            return null;
                    }
                    ps = ps.nextProc;
                }
            }
            returned_scope = tmp;
            return ps;
        }

        public override void visit(procedure_header _procedure_header)
        {
            //throw new Exception("The method or operation is not implemented.");
            SymScope topScope;
            ProcScope ps = null;
            ElementScope[] predef_params = null;
            bool not_def = false;
            ProcRealization pr = null;
            bool is_realization = false;
            location loc = get_location(_procedure_header);
            if (_procedure_header.name != null)
            {
                _procedure_header.name.visit(this);

                if (_procedure_header.name.class_name != null)
                {
                    topScope = null;
                    if (_procedure_header.name.ln != null && _procedure_header.name.ln.Count > 0)
                    {
                        SymScope tmp_scope = cur_scope;
                        for (int i = 0; i < _procedure_header.name.ln.Count; i++)
                        {
                            tmp_scope = tmp_scope.FindName(_procedure_header.name.ln[i].name);
                            if (tmp_scope == null)
                                break;
                        }
                        topScope = tmp_scope;
                    }
                    else
                        topScope = cur_scope.FindName(_procedure_header.name.class_name.name);
                    if (topScope != null)
                    {
                        ps = topScope.FindNameOnlyInThisType(meth_name) as ProcScope;
                        if (ps != null && ps is CompiledMethodScope)
                            ps = null;
                        if (ps == null)
                        {
                            ps = new ProcScope(meth_name, topScope);
                            ps.head_loc = loc;
                            bool ext = false;
                            if (topScope is CompiledScope || topScope is ArrayScope || topScope is TypeSynonim /*&& ((topScope as TypeSynonim).actType is CompiledScope || (topScope as TypeSynonim).actType is ArrayScope || (topScope as TypeSynonim).actType is DiapasonScope)*/)
                                ext = true;
                            else if (!(topScope is TypeSynonim) && !(topScope is PointerScope) && !(topScope is SetScope) && !(topScope is FileScope))
                                ext = true;
                            if (ext)
                            {
                                not_def = true;
                                ps.is_extension = true;
                                ps.AddName("self", new ElementScope(new SymInfo("self", SymbolKind.Parameter, "self"), topScope, cur_scope));
                                ps.declaringType = topScope as TypeScope;
                                TypeScope ts = topScope as TypeScope;
                                if (topScope is TypeSynonim)
                                    ts = (ts as TypeSynonim).actType;
                                this.entry_scope.AddExtensionMethod(meth_name, ps, ts);
                                ts.AddExtensionMethod(meth_name, ps, ts);
                            }
                        }
                        //while (ps != null && ps.already_defined) ps = ps.nextProc;
                        else
                        {
                            if (ps.parameters != null)
                                predef_params = ps.parameters.ToArray();
                            ps = select_function_definition(ps, _procedure_header.parameters, null, topScope as TypeScope);
                        }
                            
                        if (ps == null)
                        {
                            ps = new ProcScope(meth_name, cur_scope);
                            ps.head_loc = loc;
                        }
                        if (ps.parameters.Count != 0 && _procedure_header.parameters != null && is_proc_realization)
                        {
                            predef_params = ps.parameters.ToArray();
                            ps.parameters.Clear();
                            ps.already_defined = true;
                        }
                        if (impl_scope == null)
                        {
                            pr = new ProcRealization(ps, cur_scope);
                            pr.already_defined = true;
                            pr.loc = cur_loc;
                            pr.head_loc = loc;
                            if (topScope.ElemKind == SymbolKind.Interface)
                                pr.si.not_include = true;
                            is_realization = true;
                            entry_scope.AddName("$method", pr);
                        }
                        else
                        {
                            pr = new ProcRealization(ps, impl_scope);
                            pr.already_defined = true;
                            pr.loc = cur_loc;
                            is_realization = true;
                            pr.head_loc = loc;
                            impl_scope.AddName("$method", pr);
                        }
                    }
                    else
                    {
                        ps = new ProcScope(meth_name, cur_scope);
                        ps.head_loc = loc;
                    }
                }
                else
                {
                    ps = new ProcScope(meth_name, cur_scope);
                    if (_procedure_header.proc_attributes != null && has_extensionmethod_attr(_procedure_header.proc_attributes.proc_attributes) && _procedure_header.parameters.params_list.Count > 0)
                    {
                        ps.is_extension = true;
                        if (_procedure_header.parameters.params_list[0].vars_type is enum_type_definition)
                        {
                            template_type_reference tuple = new template_type_reference();
                            tuple.name = new named_type_reference(new ident_list(new ident("System"), new ident("Tuple")).idents);
                            template_param_list tpl = new template_param_list();
                            enum_type_definition etd = _procedure_header.parameters.params_list[0].vars_type as enum_type_definition;
                            foreach (enumerator en in etd.enumerators.enumerators)
                            {
                                tpl.Add(en.name);
                            }
                            tuple.params_list = tpl;
                            tuple.visit(this);
                        }
                        else
                            _procedure_header.parameters.params_list[0].vars_type.visit(this);
                        topScope = returned_scope;
                        ps.declaringType = topScope as TypeScope;
                        TypeScope ts = topScope as TypeScope;
                        if (topScope is TypeSynonim)
                            ts = (ts as TypeSynonim).actType;
                        if (ts.original_type != null && ts.instances != null)
                        {
                            bool pure_instance = true;
                            foreach (TypeScope gen_arg in ts.instances)
                            {
                                if (!(gen_arg is TemplateParameterScope))
                                    pure_instance = false;
                            }
                            if (pure_instance)
                                ts = ts.original_type;
                        }
                        this.entry_scope.AddExtensionMethod(meth_name, ps, ts);
                        topScope.AddExtensionMethod(meth_name, ps, ts);
                        pr = new ProcRealization(ps, cur_scope);
                        pr.already_defined = true;
                        pr.loc = cur_loc;
                        pr.head_loc = loc;
                        if (impl_scope != null)
                            impl_scope.AddName("$method", pr);
                        else
                            this.entry_scope.AddName("$method", pr);
                    }
                    ps.head_loc = loc;
                    if (!ps.is_extension)
                    {
                        if (IsForward(_procedure_header))
                        {
                            cur_scope.AddName(meth_name, ps);
                            ps.is_forward = true;
                        }
                        else
                        {
                            bool found_in_top = false;
                            SymScope ss = null;
                            if (cur_scope is ImplementationUnitScope)
                            {
                                ss = (cur_scope as ImplementationUnitScope).topScope.FindNameOnlyInThisType(meth_name);
                                if (ss != null && ss is ProcScope)
                                {

                                    ps = select_function_definition(ss as ProcScope, _procedure_header.parameters, null, null);
                                    if (ps == null && _procedure_header.parameters == null)
                                        ps = ss as ProcScope;
                                    if (ps == null)
                                    {
                                        ps = new ProcScope(meth_name, cur_scope);
                                        ps.head_loc = loc;
                                    }
                                    
                                    //ps = ss as ProcScope;
                                    if (ps.parameters.Count != 0 && _procedure_header.parameters != null)
                                    {
                                        predef_params = ps.parameters.ToArray();
                                        ps.parameters.Clear();
                                        ps.already_defined = true;
                                    }
                                    pr = new ProcRealization(ps, cur_scope);
                                    pr.already_defined = true;
                                    pr.loc = cur_loc;
                                    pr.head_loc = loc;
                                    is_realization = true;
                                    cur_scope.AddName("$method", pr);
                                    found_in_top = true;
                                }
                            }
                            if (!found_in_top) //ne nashli opisanie v interface chasti modilja
                            {
                                //ss = cur_scope.FindNameOnlyInType(meth_name);
                                ss = cur_scope.FindName(meth_name);
                                if (ss != null && ss is ProcScope)
                                {
                                    if ((ss as ProcScope).is_forward && ss == select_function_definition(ss as ProcScope, _procedure_header.parameters, null, null))
                                    {
                                        //if ((ss as ProcScope).parameters.Count != 0 && _procedure_header.parameters != null) (ss as ProcScope).parameters.Clear();
                                        pr = new ProcRealization(ss as ProcScope, cur_scope);
                                        pr.already_defined = true;
                                        pr.loc = cur_loc;
                                        cur_scope.AddName("$method", pr);
                                        returned_scope = pr;
                                        pr.head_loc = loc;
                                        return;
                                    }
                                    else
                                    {
                                        ps = new ProcScope(meth_name, cur_scope);
                                        ps.head_loc = loc;
                                        if (ps.topScope == ss.topScope)
                                        {
                                            while ((ss as ProcScope).nextProc != null && (ss as ProcScope).nextProc.topScope == ps.topScope) ss = (ss as ProcScope).nextProc;
                                            ProcScope tmp_ps = (ss as ProcScope).nextProc;
                                            (ss as ProcScope).nextProc = ps;
                                            ps.nextProc = tmp_ps;
                                            cur_scope.AddName(meth_name, ps);
                                            ps.si.name = meth_name;
                                        }
                                        else
                                        {
                                            ps.nextProc = ss as ProcScope;
                                            cur_scope.AddName(meth_name, ps);
                                        }
                                        //ps = select_function_definition(ss as ProcScope,_procedure_header.parameters);
                                    }
                                }
                                else
                                {
                                    cur_scope.AddName(meth_name, ps);
                                }
                            }
                        }
                    }
                }
            }
            else
            {
                ps = new ProcScope("", cur_scope);
                ps.head_loc = loc;
            }
            if ((!is_realization || not_def) && ps.loc == null)
                ps.loc = cur_loc;
            //ps.head_loc = loc;
            ps.declaringUnit = entry_scope;
            if (_procedure_header.template_args != null && !ps.IsGeneric())
            {
                Dictionary<string, List<TypeScope>> where_types = new Dictionary<string, List<TypeScope>>();
                if (_procedure_header.where_defs != null)
                {
                    foreach (where_definition wd in _procedure_header.where_defs.defs)
                    {
                        for (int i = 0; i < wd.names.idents.Count; i++)
                        {
                            string name = wd.names.idents[i].name;
                            for (int j = 0; j < wd.types.defs.Count; j++)
                            {
                                wd.types.defs[j].visit(this);
                                if (!where_types.ContainsKey(name))
                                    where_types[name] = new List<TypeScope>();
                                where_types[name].Add(returned_scope as TypeScope);
                            }
                        }
                    }
                }
                foreach (ident s in _procedure_header.template_args.idents)
                {
                    ps.AddTemplateParameter(s.name);
                    List<TypeScope> where_ts_list = null;
                    where_types.TryGetValue(s.name, out where_ts_list);
                    TypeScope base_ts = TypeTable.obj_type;
                    if (where_ts_list != null)
                        foreach (TypeScope ts in where_ts_list)
                        {
                            TypeScope where_ts = ts;
                            if (where_ts == null)
                                where_ts = TypeTable.obj_type;
                            base_ts = new TypeScope(where_ts.si.kind, where_ts.topScope, base_ts);
                            base_ts.AddImplementedInterface(where_ts);

                        }
                    TemplateParameterScope tps = new TemplateParameterScope(s.name, base_ts, ps);
                    tps.loc = get_location(s);
                    ps.AddName(s.name, tps);

                }
            }
            SetAttributes(ps, _procedure_header.proc_attributes);
            ps.is_static = _procedure_header.class_keyword;
            if (add_doc_from_text && this.converter.controller.docs != null && this.converter.controller.docs.ContainsKey(_procedure_header))
                ps.AddDocumentation(this.converter.controller.docs[_procedure_header]);

            if (is_proc_realization) ps.already_defined = true;
            else
            {
                ps.loc = loc;
            }
            if (_procedure_header.name == null || _procedure_header.name.class_name == null)
            {
                ps.acc_mod = cur_access_mod;
                ps.si.acc_mod = cur_access_mod;
            }
            SymScope tmp = cur_scope;
            cur_scope = ps;
            if (_procedure_header.parameters != null)
                add_parameters(ps, _procedure_header.parameters, predef_params);
            cur_scope = tmp;
            if (cur_scope is TypeScope && !ps.is_static)
                ps.AddName("self", new ElementScope(new SymInfo("self", SymbolKind.Parameter, "self"), cur_scope, ps));
            //cur_scope = ps;
            returned_scope = ps;
            ps.Complete();
            if (pr != null && not_def)
                pr.Complete();
        }

        bool has_extensionmethod_attr(List<procedure_attribute> attrs)
        {
            foreach (procedure_attribute attr in attrs)
            {
                if (attr.attribute_type == PascalABCCompiler.SyntaxTree.proc_attribute.attr_extension)
                {
                    return true;
                }
            }
            return false;
        }

        public override void visit(function_header _function_header)
        {
            SymScope topScope;
            ProcScope ps = null;
            ElementScope[] predef_params = null;
            bool is_realization = false;
            TypeScope return_type = null;
            bool not_def = false;
            ProcRealization pr = null;
            location loc = get_location(_function_header);
            returned_scope = null;
            if (_function_header.return_type != null && !(_function_header.return_type is enum_type_definition && _function_header.template_args != null && _function_header.template_args.Count > 0))
                _function_header.return_type.visit(this);
            if (returned_scope != null)
            {
                if (returned_scope is ProcScope)
                    returned_scope = new ProcType(returned_scope as ProcScope);
                return_type = returned_scope as TypeScope;
            }
            if (_function_header.name != null)
            {
                _function_header.name.visit(this);
                if (_function_header.name.class_name != null)
                {
                    topScope = null;
                    if (_function_header.name.ln != null && _function_header.name.ln.Count > 0)
                    {
                        SymScope tmp_scope = cur_scope;
                        for (int i = 0; i < _function_header.name.ln.Count; i++)
                        {
                            tmp_scope = tmp_scope.FindName(_function_header.name.ln[i].name);
                            if (tmp_scope == null)
                                break;
                        }
                        topScope = tmp_scope;
                    }
                    else
                        topScope = cur_scope.FindName(_function_header.name.class_name.name);
                    if (topScope != null)
                    {
                        ps = topScope.FindNameOnlyInThisType(meth_name) as ProcScope;
                        if (ps != null && ps is CompiledMethodScope)
                            ps = null;
                        if (ps == null)
                        {
                            ps = new ProcScope(meth_name, topScope);

                            ps.head_loc = loc;
                            bool ext = false;
                            if (topScope is CompiledScope || topScope is ArrayScope || topScope is TypeSynonim /*&& ((topScope as TypeSynonim).actType is CompiledScope || (topScope as TypeSynonim).actType is ArrayScope || (topScope as TypeSynonim).actType is DiapasonScope)*/)
                                ext = true;
                            else if (!(topScope is TypeSynonim) && !(topScope is PointerScope) && !(topScope is SetScope) && !(topScope is FileScope))
                                ext = true;
                            if (ext)
                            {
                                not_def = true;
                                ps.AddName("self", new ElementScope(new SymInfo("self", SymbolKind.Parameter, "self"), topScope, cur_scope));
                                ps.declaringType = topScope as TypeScope;
                                ps.is_extension = true;
                                TypeScope ts = topScope as TypeScope;
                                if (topScope is TypeSynonim)
                                    ts = (ts as TypeSynonim).actType;
                                this.entry_scope.AddExtensionMethod(meth_name, ps, ts);
                                ts.AddExtensionMethod(meth_name, ps, ts);
                            }
                        }
                        else
                        {
                            ps = select_function_definition(ps, _function_header.parameters, return_type, topScope as TypeScope, true);
                        }
                            
                        //while (ps != null && ps.already_defined) ps = ps.nextProc;
                        if (ps == null)
                        {
                            ps = new ProcScope(meth_name, cur_scope);
                            ps.head_loc = loc;

                        }
                        if (ps.parameters.Count != 0 && _function_header.parameters != null && is_proc_realization)
                        {
                            predef_params = ps.parameters.ToArray();
                            ps.parameters.Clear();
                            ps.already_defined = true;
                        }
                        if (impl_scope == null)
                        {
                            pr = new ProcRealization(ps, cur_scope);
                            pr.already_defined = true;
                            pr.loc = cur_loc;
                            is_realization = true;
                            pr.head_loc = loc;
                            entry_scope.AddName("$method", pr);
                        }
                        else
                        {
                            pr = new ProcRealization(ps, impl_scope);
                            pr.already_defined = true;
                            pr.loc = cur_loc;
                            pr.head_loc = loc;
                            is_realization = true;
                            impl_scope.AddName("$method", pr);
                        }
                    }
                    else
                    {
                        ps = new ProcScope(meth_name, cur_scope);
                        ps.head_loc = loc;
                    }
                }
                else
                {
                    ps = new ProcScope(meth_name, cur_scope);
                    ps.head_loc = loc;
                    if (_function_header.proc_attributes != null && has_extensionmethod_attr(_function_header.proc_attributes.proc_attributes) && _function_header.parameters.params_list.Count > 0)
                    {
                        ps.is_extension = true;
                        if (_function_header.parameters.params_list[0].vars_type is enum_type_definition)
                        {
                            template_type_reference tuple = new template_type_reference();
                            tuple.name = new named_type_reference(new ident_list(new ident("System"), new ident("Tuple")).idents);
                            template_param_list tpl = new template_param_list();
                            enum_type_definition etd = _function_header.parameters.params_list[0].vars_type as enum_type_definition;
                            foreach (enumerator en in etd.enumerators.enumerators)
                            {
                                tpl.Add(en.name);
                            }
                            tuple.params_list = tpl;
                            tuple.visit(this);
                        }
                        else
                            _function_header.parameters.params_list[0].vars_type.visit(this);
                        topScope = returned_scope;
                        if (topScope is ProcScope)
                            topScope = new ProcType(topScope as ProcScope);
                        ps.declaringType = topScope as TypeScope;

                        TypeScope ts = topScope as TypeScope;
                        if (topScope is TypeSynonim)
                            ts = (ts as TypeSynonim).actType;
                        if (ts.original_type != null && ts.instances != null)
                        {
                            bool pure_instance = true;
                            foreach (TypeScope gen_arg in ts.instances)
                            {
                                if (!(gen_arg is TemplateParameterScope) && !(gen_arg is UnknownScope))
                                    pure_instance = false;
                            }
                            if (pure_instance)
                                ts = ts.original_type;
                        }
                        this.entry_scope.AddExtensionMethod(meth_name, ps, ts);
                        topScope.AddExtensionMethod(meth_name, ps, ts);
                        /*if (topScope is TemplateParameterScope || topScope is UnknownScope)
                            TypeTable.obj_type.AddExtensionMethod(meth_name, ps, ts);*/
                        pr = new ProcRealization(ps, cur_scope);
                        pr.already_defined = true;
                        pr.loc = cur_loc;
                        pr.head_loc = loc;
                        if (impl_scope != null)
                            impl_scope.AddName("$method", pr);
                        else
                            this.entry_scope.AddName("$method", pr);
                    }
                    if (!ps.is_extension)
                    {
                        if (IsForward(_function_header))
                        {
                            cur_scope.AddName(meth_name, ps);
                            ps.is_forward = true;
                        }
                        else
                        {
                            bool found_in_top = false;
                            SymScope ss = null;
                            if (cur_scope is ImplementationUnitScope)
                            {
                                ss = (cur_scope as ImplementationUnitScope).topScope.FindNameOnlyInThisType(meth_name);
                                if (ss != null && ss is ProcScope)
                                {
                                    //while ((ss as ProcScope).already_defined && (ss as ProcScope).nextProc != null) ss = (ss as ProcScope).nextProc;
                                    //ps = ss as ProcScope;
                                    if (ps.parameters != null)
                                        predef_params = ps.parameters.ToArray();
                                    ps = select_function_definition(ss as ProcScope, _function_header.parameters, return_type, null, true);
                                    if (ps == null && _function_header.parameters == null && _function_header.return_type == null)
                                        ps = ss as ProcScope;
                                    if (ps == null)
                                    {
                                        ps = new ProcScope(meth_name, cur_scope);
                                        ps.head_loc = loc;
                                    }
                                    if (ps.parameters.Count != 0 && _function_header.parameters != null)
                                    {
                                        ps.parameters.Clear();
                                        ps.already_defined = true;
                                    }
                                    pr = new ProcRealization(ps, cur_scope);
                                    pr.already_defined = true;
                                    pr.loc = cur_loc;
                                    pr.head_loc = loc;
                                    is_realization = true;
                                    cur_scope.AddName("$method", pr);
                                    found_in_top = true;
                                }
                            }
                            if (!found_in_top)
                            {
                                //ss = cur_scope.FindNameOnlyInType(meth_name);
                                ss = cur_scope.FindName(meth_name);
                                if (ss != null && ss is ProcScope)
                                {
                                    if ((ss as ProcScope).is_forward && ss == select_function_definition(ss as ProcScope, _function_header.parameters, (ss as ProcScope).return_type, null, true))
                                    {
                                        //if ((ss as ProcScope).parameters.Count != 0 && _function_header.parameters != null) (ss as ProcScope).parameters.Clear();
                                        pr = new ProcRealization(ss as ProcScope, cur_scope);
                                        pr.already_defined = true;
                                        pr.loc = cur_loc;
                                        cur_scope.AddName("$method", pr);
                                        pr.head_loc = loc;
                                        returned_scope = pr;
                                        return;
                                    }
                                    else
                                    {
                                        ps = new ProcScope(meth_name, cur_scope);
                                        ps.head_loc = loc;
                                        if (ps.topScope == ss.topScope)
                                        {
                                            while ((ss as ProcScope).nextProc != null && (ss as ProcScope).nextProc.topScope == ps.topScope)
                                                ss = (ss as ProcScope).nextProc;
                                            ProcScope tmp_ps = (ss as ProcScope).nextProc;
                                            (ss as ProcScope).nextProc = ps;
                                            ps.nextProc = tmp_ps;
                                            cur_scope.AddName(meth_name, ps);
                                            ps.si.name = meth_name;
                                        }
                                        else
                                        {
                                            ps.nextProc = ss as ProcScope;
                                            cur_scope.AddName(meth_name, ps);
                                        }
                                    }
                                }
                                else
                                {
                                    cur_scope.AddName(meth_name, ps);
                                }
                            }
                        }
                    }
                }
            }
            else
            {
                ps = new ProcScope("", cur_scope);
                ps.head_loc = loc;
            }
            if ((!is_realization || not_def) && ps.loc == null)
                ps.loc = cur_loc;
            //ps.head_loc = loc;
            ps.declaringUnit = entry_scope;
            SymScope tmp = cur_scope;
            if (_function_header.template_args != null && !ps.IsGeneric())
            {
                Dictionary<string, List<TypeScope>> where_types = new Dictionary<string, List<TypeScope>>();
                if (_function_header.where_defs != null)
                {
                    foreach (where_definition wd in _function_header.where_defs.defs)
                    {
                        for (int i = 0; i < wd.names.idents.Count; i++)
                        {
                            string name = wd.names.idents[i].name;
                            for (int j = 0; j < wd.types.defs.Count; j++)
                            {
                                wd.types.defs[j].visit(this);
                                if (!where_types.ContainsKey(name))
                                    where_types[name] = new List<TypeScope>();
                                where_types[name].Add(returned_scope as TypeScope);
                            }
                        }
                    }
                }
                foreach (ident s in _function_header.template_args.idents)
                {
                    ps.AddTemplateParameter(s.name);
                    List<TypeScope> where_ts_list = null;
                    where_types.TryGetValue(s.name, out where_ts_list);
                    TypeScope base_ts = TypeTable.obj_type;
                    if (where_ts_list != null)
                        foreach (TypeScope ts in where_ts_list)
                        {
                            TypeScope where_ts = ts;
                            if (where_ts == null)
                                where_ts = TypeTable.obj_type;
                            base_ts = new TypeScope(where_ts.si.kind, where_ts.topScope, base_ts);
                            base_ts.AddImplementedInterface(where_ts);

                        }
                    TemplateParameterScope tps = new TemplateParameterScope(s.name, base_ts, ps);
                    tps.loc = get_location(s);
                    ps.AddName(s.name, tps);

                }
                if (ps.return_type == null)
                {
                    cur_scope = ps;
                    if (_function_header.return_type != null)
                        _function_header.return_type.visit(this);
                    return_type = returned_scope as TypeScope;

                    cur_scope = tmp;
                }
            }

            SetAttributes(ps, _function_header.proc_attributes);
            ps.is_static = _function_header.class_keyword;
            if (add_doc_from_text && this.converter.controller.docs != null && this.converter.controller.docs.ContainsKey(_function_header))
                ps.AddDocumentation(this.converter.controller.docs[_function_header]);
            if (is_proc_realization)
            {
                ps.already_defined = true;
                if (ps.loc == null)
                    ps.loc = loc;
            }
            else
            {
                ps.loc = loc;
            }
            if (_function_header.name == null || _function_header.name.class_name == null)
            {
                ps.acc_mod = cur_access_mod;
                ps.si.acc_mod = cur_access_mod;
            }

            cur_scope = ps;
            if (_function_header.parameters != null)
                add_parameters(ps, _function_header.parameters, predef_params);
            cur_scope = tmp;
            if (ps.procRealization == null || ps.return_type == null)
                ps.return_type = return_type;
            //cur_scope = ps;
            if (cur_scope is TypeScope && !ps.is_static)
                ps.AddName("self", new ElementScope(new SymInfo("self", SymbolKind.Parameter, "self"), cur_scope, ps));

            returned_scope = ps;
           
            var resultName = currentUnitLanguage.LanguageInformation.ResultVariableName;
            if (resultName != null)
            {
                ps.AddName(resultName, new ElementScope(new SymInfo(resultName, SymbolKind.Variable, resultName), ps.return_type, ps));
            }
            ps.Complete();
            if (pr != null && not_def)
                pr.Complete();
        }
		
        private void add_parameters(ProcScope ps, formal_parameters parameters, ElementScope[] predef_params)
        {
            int i = 0;
            foreach (typed_parameters pars in parameters.params_list)
            {
                pars.vars_type.visit(this);
                if (returned_scope != null)
                {
                    if (returned_scope is ProcScope)
                        returned_scope = new ProcType(returned_scope as ProcScope);
                    foreach (ident id in pars.idents.idents)
                    {
                        ElementScope si = new ElementScope(new SymInfo(id.name, SymbolKind.Parameter, id.name), returned_scope, ps);
                        si.loc = get_location(id);
                        if (pars.inital_value != null)
                        {
                            cnst_val.prim_val = null;
                            if (!(pars.inital_value is nil_const))
                            {
                                pars.inital_value.visit(this);
                                if (cnst_val.prim_val != null)
                                    si.cnst_val = cnst_val.prim_val;
                                else
                                    si.cnst_val = pars.inital_value.ToString();
                            }
                            else
                                si.cnst_val = "nil";
                        }
                        ps.AddName(id.name, si);
                        si.param_kind = pars.param_kind;
                        si.MakeDescription();
                        if (si.cnst_val == null && predef_params != null && i < predef_params.Length)
                            si.cnst_val = predef_params[i].cnst_val;
                        ps.AddParameter(si);
                        i++;
                    }
                }
            }
        }

        
        public override void visit(procedure_definition _procedure_definition)
        {
            //throw new Exception("The method or operation is not implemented.");
            SymScope tmp = cur_scope;
            cur_loc = get_location(_procedure_definition);
            if (!parse_only_method_body)
            {
                is_proc_realization = true;
                _procedure_definition.proc_header.visit(this);
                is_proc_realization = false;
            }
            
            if (_procedure_definition.proc_body != null)
            {
                if (!parse_only_method_body && _procedure_definition.proc_header is function_header && (_procedure_definition.proc_header as function_header).return_type == null)
                {
                    var fh = (_procedure_definition.proc_header as function_header);
                    if (fh != null && fh.return_type == null && !(returned_scope is ProcScope && (returned_scope as ProcScope).procRealization != null && !(returned_scope as ProcScope).is_extension))
                    {
                        var bl = _procedure_definition.proc_body as block;
                        if (bl != null && bl.program_code != null)
                        {
                            if (bl.program_code.subnodes.Count == 1)
                            {
                                var ass = bl.program_code.subnodes[0] as assign;
                                if (ass != null && ass.to is ident && (ass.to as ident).name.Equals(currentUnitLanguage.LanguageInformation.ResultVariableName, currentUnitLanguage.CaseSensitive ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase))
                                {
                                    if (!(ass.from is nil_const))
                                    {
                                        ProcScope tmp_scope = returned_scope as ProcScope;
                                        cur_scope = returned_scope;
                                        ass.from.visit(this);
                                        if (returned_scope != null && returned_scope is TypeScope)
                                        {
                                            
                                            tmp_scope.return_type = returned_scope as TypeScope;
                                            if (tmp_scope.return_type is ProcType && (tmp_scope.return_type as ProcType).target == tmp_scope)
                                                tmp_scope.return_type = null;
                                            tmp_scope.Complete();
                                            returned_scope = tmp_scope;
                                        }
                                    }
                                }
                            } 
                        }
                    }
                }
                if (!parse_only_method_body)
                    cur_scope = returned_scope;
            	/*if ((ret_tn as ProcScope).return_type != null)
            	{
            		ret_tn.AddName("Result",new ElementScope(new SymInfo("Result", SymbolKind.Variable,"Result"),(ret_tn as ProcScope).return_type,cur_scope));
            	}*/
                if (!parse_only_interface && !parse_only_method_header)
                {
                	try
                	{
                		_procedure_definition.proc_body.visit(this);
                	}
                	catch (Exception ex)
                	{
                		
                	}
                }
            	    
                if (cur_scope != null && cur_scope is ProcScope)
                {
                    ProcRealization pr = (cur_scope as ProcScope).procRealization;
                    if (pr == null)
                        cur_scope.body_loc = get_location(_procedure_definition.proc_body);
                    else
                        pr.body_loc = get_location(_procedure_definition.proc_body);
                }
            }
            cur_scope = tmp;
        }
		
        private List<PointerScope> ref_type_wait_list = new List<PointerScope>();
        
        private ident_list template_args = null;

        public override void visit(type_declaration _type_declaration)
        {
            //throw new Exception("The method or operation is not implemented.");
            cur_type_name = _type_declaration.type_name.name;
            List<string> generic_params = new List<string>();
            if (_type_declaration.type_name is template_type_name)
            {
                template_args = (_type_declaration.type_name as template_type_name).template_args;
                foreach (ident id in (_type_declaration.type_name as template_type_name).template_args.list)
                {
                    generic_params.Add(id.name);
                }
            }
            _type_declaration.type_def.visit(this);
            if (returned_scope != null && returned_scope is PointerScope && (returned_scope as PointerScope).ref_type is UnknownScope)
            {
                ref_type_wait_list.Add(returned_scope as PointerScope);
            }
            //else
            if (returned_scope != null && returned_scope is TypeScope)
            {
                /*if (!(_type_declaration.type_def is named_type_reference) && !(_type_declaration.type_def is sequence_type)
                    && !(_type_declaration.type_def is sequence_type) && !(_type_declaration.type_def is array_type)
                    && !(returned_scope is CompiledScope && _type_declaration.type_def is enum_type_definition))*/
                if (_type_declaration.type_def is class_definition)
                {
                    //(ret_tn as TypeScope).name = _type_declaration.type_name.name;
                    returned_scope.si.name = _type_declaration.type_name.name;
                    returned_scope.si.description = returned_scope.GetDescription();
                    if (!(_type_declaration.type_def is class_definition))
                        returned_scope.MakeSynonimDescription();
                    returned_scope.loc = get_location(_type_declaration);//new location(loc.begin_line_num,loc.begin_column_num,ret_tn.loc.end_line_num,ret_tn.loc.end_column_num,ret_tn.loc.doc);
                    if (_type_declaration.type_def is class_definition)
                    {
                        class_definition cl_def = _type_declaration.type_def as class_definition;
                        string key = this.converter.controller.Parser.LanguageInformation.GetClassKeyword(cl_def.keyword);
                        if (cl_def.attribute == class_attribute.Auto)
                            key = "auto " + key;
                        else if ((cl_def.attribute & class_attribute.Abstract) == class_attribute.Abstract)
                            key = "abstract " + key;
                        else if ((cl_def.attribute & class_attribute.Sealed) == class_attribute.Sealed)
                            key = "sealed " + key;
                        else if ((cl_def.attribute & class_attribute.Static) == class_attribute.Static)
                            key = "static " + key;
                        if (key != null && returned_scope.body_loc != null)
                        {
                            returned_scope.head_loc = new location(returned_scope.body_loc.begin_line_num, returned_scope.body_loc.begin_column_num, returned_scope.body_loc.begin_line_num, returned_scope.body_loc.begin_column_num + key.Length, doc);
                        }
                        if ((cl_def.attribute & class_attribute.Partial) == class_attribute.Partial)
                        {
                            List<SymScope> lst = cur_scope.FindOverloadNames(cur_type_name);
                            if (lst != null)
                            {
                                var this_ts = returned_scope as TypeScope;
                                foreach (SymScope ss in lst)
                                {
                                    var ts = ss as TypeScope;
                                    if (ts != null)
                                    {
                                        ts.AddPartial(this_ts);
                                        this_ts.AddPartial(ts);
                                    }
                                }
                            }
                        }
                    }
                    if (add_doc_from_text && this.converter.controller.docs != null && this.converter.controller.docs.ContainsKey(_type_declaration))
                        returned_scope.AddDocumentation(this.converter.controller.docs[_type_declaration]);
                    if (!(_type_declaration.type_def is class_definition))
                        cur_scope.AddName(_type_declaration.type_name.name, returned_scope);
                }
                else
                {
                    TypeSynonim ts = new TypeSynonim(new SymInfo(_type_declaration.type_name.name, returned_scope.si.kind, _type_declaration.type_name.name), returned_scope, generic_params);
                    ts.loc = get_location(_type_declaration);
                    ts.topScope = cur_scope;
                    ts.declaringUnit = entry_scope;
                    //ts.si.describe = "type "+ret_tn.si.name+" = "+ret_tn.si.describe;
                    if (_type_declaration.type_def is enum_type_definition && ts.loc.begin_line_num != ts.loc.end_line_num)
                    {
                        location loc = get_location(_type_declaration.type_def);
                        ts.head_loc = new location(loc.begin_line_num, loc.begin_column_num, loc.begin_line_num, loc.begin_column_num, doc);
                        ts.body_loc = loc;
                    }
                    cur_scope.AddName(_type_declaration.type_name.name, ts);
                    if (add_doc_from_text && this.converter.controller.docs != null && this.converter.controller.docs.ContainsKey(_type_declaration))
                        ts.AddDocumentation(this.converter.controller.docs[_type_declaration]);
                }

            }
            else if (returned_scope != null)
            {
                if (returned_scope is ProcScope)
                {
                    returned_scope = new ProcType(returned_scope as ProcScope, generic_params);
                    returned_scope.topScope = cur_scope;
                }
                cur_scope.AddName(_type_declaration.type_name.name, returned_scope);
                if (returned_scope is ProcType)
                {
                    returned_scope.MakeSynonimDescription();
                }
                location loc = get_location(_type_declaration);
                if (returned_scope.loc == null)
                {
                    returned_scope.loc = loc;
                    //ret_tn.loc = new location(loc.begin_line_num,loc.begin_column_num,ret_tn.loc.end_line_num,ret_tn.loc.end_column_num,ret_tn.loc.doc);
                }
            }
            returned_scope.declaringUnit = entry_scope;
            if (ref_type_wait_list.Count == 0) returned_scope = null;
            cur_type_name = null;
            template_args = null;
        }

        public override void visit(type_declarations _type_declarations)
        {
            //throw new Exception("The method or operation is not implemented.");
            Hashtable ht = new Hashtable(StringComparer.OrdinalIgnoreCase);
            foreach (type_declaration td in _type_declarations.types_decl)
            {
            	
            	td.visit(this);
            	if (td.type_name != null)
            	ht[td.type_name.name] = returned_scope;
            }
            if (ref_type_wait_list.Count > 0)
            {
            	for (int i=0; i<ref_type_wait_list.Count; i++)
            	{
            		PointerScope ps = ref_type_wait_list[i];
            		TypeScope ts = ht[ps.ref_type.si.name] as TypeScope;
            		if (ts != null)
            		{
            			ps.ref_type = ts;
            		}
            	}
            }
            returned_scope = null;
            ref_type_wait_list.Clear();
        }

        public override void visit(simple_const_definition _simple_const_definition)
        {
            //throw new Exception("The method or operation is not implemented.");
            try
            {
                _simple_const_definition.const_value.visit(this);
            }
            catch (Exception e)
            {
#if DEBUG
                File.AppendAllText("log.txt", e.Message + Environment.NewLine + e.StackTrace + Environment.NewLine);
#endif
            }
            if (returned_scope != null /*&& cnst_val.prim_val != null*/)
            {
                ElementScope es = new ElementScope(new SymInfo(_simple_const_definition.const_name.name, SymbolKind.Constant, _simple_const_definition.const_name.name), returned_scope, cnst_val.prim_val != null? cnst_val.prim_val: get_constant_as_string(_simple_const_definition.const_value), cur_scope);
                es.is_static = true;
                cur_scope.AddName(_simple_const_definition.const_name.name, es);
                es.loc = get_location(_simple_const_definition.const_name);
                es.declaringUnit = entry_scope;
                if (add_doc_from_text && this.converter.controller.docs != null && this.converter.controller.docs.ContainsKey(_simple_const_definition))
                    es.AddDocumentation(this.converter.controller.docs[_simple_const_definition]);
            }
            returned_scope = null;
            cnst_val.prim_val = null;
        }

        private string get_constant_as_string(expression e)
        {
            if (e is pascal_set_constant || e is PascalABCCompiler.SyntaxTree.array_const)
            {
                List<string> elems = new List<string>();
                pascal_set_constant set = e as pascal_set_constant;
                PascalABCCompiler.SyntaxTree.array_const arr = e as PascalABCCompiler.SyntaxTree.array_const;
                expression_list values = null;
                if (set != null)
                    values = set.values;
                else
                    values = arr.elements;
                if (values == null)
                    return "[]";
                if (values.Count > 10)//dlinnye konstanty ne pokazyvaem
                    return null;//prosto const c: <type>
                foreach (expression elem in values.expressions)
                {
                    if (elem is ident || elem is int32_const || elem is char_const || elem is string_const)
                        elems.Add(get_constant_as_string(elem));//tolko primitivy
                    else
                        return null;
                }
                //govnostudia ne daet podkluchit Core.dll i ne mogu vyzvat Join. urody
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < elems.Count; i++)
                {
                    sb.Append(elems[i]);
                    if (i < elems.Count - 1)
                        sb.Append(", ");
                }
                if (set != null)
                    return "[" + sb.ToString() + "]";
                else
                    return "(" + sb.ToString() + ")";
            }
            else if (e is char_const)
                return "'" + (e as char_const).cconst + "'";
            else if (e.ToString().Contains("PascalABCCompiler.SyntaxTree"))
                return null;
            else
                return e.ToString();
        }

        public override void visit(typed_const_definition _typed_const_definition)
        {
            //throw new Exception("The method or operation is not implemented.");
            _typed_const_definition.const_type.visit(this);
            if (returned_scope == null) return;
            cnst_val.prim_val = null;
            SymScope cnst_type = returned_scope;
            try
            {
                _typed_const_definition.const_value.visit(this);
            }
            catch (Exception e)
            {
#if DEBUG
                File.AppendAllText("log.txt", e.Message + Environment.NewLine + e.StackTrace + Environment.NewLine);
#endif
            }
            ElementScope es = new ElementScope(new SymInfo(_typed_const_definition.const_name.name, SymbolKind.Constant, _typed_const_definition.const_name.name), cnst_type, cnst_val.prim_val != null?cnst_val.prim_val: get_constant_as_string(_typed_const_definition.const_value), cur_scope);
            cur_scope.AddName(_typed_const_definition.const_name.name, es);
            es.loc = get_location(_typed_const_definition);
            es.is_static = true;
            es.declaringUnit = entry_scope;
            if (add_doc_from_text && this.converter.controller.docs != null && this.converter.controller.docs.ContainsKey(_typed_const_definition))
                es.AddDocumentation(this.converter.controller.docs[_typed_const_definition]);
            cnst_val.prim_val = null;
        }

        public override void visit(const_definition _const_definition)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(consts_definitions_list _consts_definitions_list)
        {
            //throw new Exception("The method or operation is not implemented.");
            foreach (const_definition cnst in _consts_definitions_list.const_defs)
            	cnst.visit(this);
        }

        public override void visit(unit_name _unit_name)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(unit_or_namespace _unit_or_namespace)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(uses_unit_in _uses_unit_in)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(uses_list _uses_list)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(program_body _program_body)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(compilation_unit _compilation_unit)
        {
            throw new Exception("The method or operation is not implemented.");
        }
		
        private Hashtable ns_cache;
        private bool is_namespace = false;

        public override void visit(unit_module _unit_module)
        {
            string path = get_assembly_path("mscorlib.dll", _unit_module.file_name);
            Assembly _as = PascalABCCompiler.NetHelper.NetHelper.LoadAssembly(path);
            AssemblyDocCache.Load(_as, path);
            PascalABCCompiler.NetHelper.NetHelper.init_namespaces(_as);
            List<string> namespaces = new List<string>();

            currentUnitLanguage = Languages.Facade.LanguageProvider.Instance.SelectLanguageByExtension(_unit_module.file_name);

            string unitName = _unit_module.unit_name.idunit_name.name;

            var languageUsingStandardUnit = Languages.Facade.LanguageProvider.Instance.Languages.Find(lang => lang.SystemUnitNames.Contains(unitName));

            // Пока что добавили возможость грубо отключить добавление NET пространств имен по умолчанию здесь (второе условие нужно, чтобы в стандартные модули языка они тоже не добавлялись) EVA
            if (currentUnitLanguage.LanguageInformation.AddStandardNetNamespacesToUserScope && (languageUsingStandardUnit?.LanguageInformation.AddStandardNetNamespacesToUserScope ?? true))
                namespaces.AddRange(PascalABCCompiler.NetHelper.NetHelper.GetNamespaces(_as));
            
            InterfaceUnitScope unit_scope = null;
            bool existed_ns = false;
            is_namespace = _unit_module.unit_name.HeaderKeyword == UnitHeaderKeyword.Namespace;
            if (_unit_module.unit_name.HeaderKeyword != UnitHeaderKeyword.Namespace || !CodeCompletionController.pabcNamespaces.TryGetValue(_unit_module.unit_name.idunit_name.name.ToLower(), out unit_scope))
            {
                cur_scope = unit_scope = new InterfaceUnitScope(new SymInfo(_unit_module.unit_name.idunit_name.name, SymbolKind.Namespace, _unit_module.unit_name.idunit_name.name), null, _unit_module.unit_name.HeaderKeyword == UnitHeaderKeyword.Namespace, _unit_module.file_name);
                if (_unit_module.unit_name.HeaderKeyword == UnitHeaderKeyword.Namespace /*&& CodeCompletionController.comp != null && CodeCompletionController.comp.CompilerOptions.CurrentProject != null*/)
                {
                    CodeCompletionController.pabcNamespaces.Add(_unit_module.unit_name.idunit_name.name.ToLower(), unit_scope);
                }
            }
            else
            {
                cur_scope = new InterfaceUnitScope(new SymInfo(_unit_module.unit_name.idunit_name.name, SymbolKind.Namespace, _unit_module.unit_name.idunit_name.name), null, _unit_module.unit_name.HeaderKeyword == UnitHeaderKeyword.Namespace, _unit_module.file_name);
                existed_ns = true;
                //cur_scope = unit_scope;
                cur_scope.symbol_table = unit_scope.symbol_table;
                unit_scope.AddNamespaceUnit(cur_scope as InterfaceUnitScope);
                unit_scope = cur_scope as InterfaceUnitScope;
                //cur_scope.members.RemoveAll(x => x.loc != null && x.loc.doc.file_name == _unit_module.file_name);
            }
            this.cur_unit_file_name = _unit_module.file_name;
            //if (XmlDoc.LookupLocalizedXmlDocForUnitWithSources(_unit_module.file_name) != null)
            if (!add_doc_from_text)
            {
                UnitDocCache.LoadWithSources(cur_scope, _unit_module.file_name);
                //this.add_doc_from_text = false;
            }
            //add_standart_types_simple();
            Stack<Position> regions_stack = new Stack<Position>();
            if (CodeCompletionController.comp != null && CodeCompletionController.comp.CompilerOptions.CurrentProject != null && CodeCompletionController.comp.CompilerOptions.CurrentProject.ContainsSourceFile(_unit_module.file_name))
            {
                IReferenceInfo[] refs = CodeCompletionController.comp.CompilerOptions.CurrentProject.References;
                if (_unit_module.compiler_directives == null)
                    _unit_module.compiler_directives = new List<PascalABCCompiler.SyntaxTree.compiler_directive>();
                foreach (IReferenceInfo ri in refs)
                {
                    _unit_module.compiler_directives.Add
                        (new PascalABCCompiler.SyntaxTree.compiler_directive(new token_info("reference"), new token_info(ri.FullAssemblyName)));
                }
            }
            List<string> included_files = new List<string>();
            if (_unit_module.compiler_directives != null)
                foreach (PascalABCCompiler.SyntaxTree.compiler_directive dir in _unit_module.compiler_directives)
                {
                    if (dir.Name.text.ToLower() == "reference")
                    {
                        try
                        {
                            //System.Reflection.Assembly assm = System.Reflection.Assembly.LoadFrom(get_assembly_path(dir.Directive.text,_unit_module.file_name));
                            path = get_assembly_path(dir.Directive.text, _unit_module.file_name);
                            System.Reflection.Assembly assm = PascalABCCompiler.NetHelper.NetHelper.LoadAssembly(path);
                            PascalABCCompiler.NetHelper.NetHelper.init_namespaces(assm);
                            AssemblyDocCache.Load(assm, path);
                            namespaces.AddRange(PascalABCCompiler.NetHelper.NetHelper.GetNamespaces(assm));
                            unit_scope.AddReferencedAssembly(assm);
                        }
                        catch (Exception)
                        {

                        }
                        //ns=new PascalABCCompiler.NetHelper.NetScope(unl,assm,tcst);
                    }
                    else
                    if (dir.Name.text.ToLower() == "region")
                    {
                        if (cur_scope.regions == null)
                            cur_scope.regions = new List<Position>();
                        regions_stack.Push(new Position(dir.source_context.begin_position.line_num, dir.source_context.begin_position.column_num, dir.source_context.end_position.line_num, dir.source_context.end_position.column_num, dir.source_context.FileName, dir.Directive.text));
                    }
                    else if (dir.Name.text.ToLower() == "endregion")
                    {
                        if (regions_stack.Count > 0)
                        {
                            Position pos = regions_stack.Pop();
                            if (cur_scope.regions != null)
                            {
                                cur_scope.regions.Add(new Position(pos.line, pos.column - 1, dir.source_context.end_position.line_num, dir.source_context.end_position.column_num, pos.file_name, pos.fold_text));
                            }
                        }
                    }
                    else if (dir.Name.text.ToLower() == "includenamespace")
                    {
                        string directive = dir.Directive.text.Replace('/', Path.DirectorySeparatorChar).Replace('\\', Path.DirectorySeparatorChar);
                        Compiler.TryThrowInvalidPath(directive, dir.source_context);

                        if (directive == "*.pas" || directive.EndsWith(Path.DirectorySeparatorChar + "*.pas"))
                        {
                            string udir = Path.Combine(Path.GetDirectoryName(_unit_module.file_name), directive.Replace(Path.DirectorySeparatorChar + "*.pas", ""));
                            foreach (string file in Directory.EnumerateFiles(udir, "*.pas"))
                                included_files.Add(file);
                        }
                        else
                            included_files.Add(Path.Combine(Path.GetDirectoryName(_unit_module.file_name), directive));
                    }
                }
            ns_cache = new Hashtable(StringComparer.CurrentCultureIgnoreCase);

            doc = new document(_unit_module.file_name);

            cur_scope.head_loc = get_location(_unit_module.unit_name);
            cur_scope.file_name = _unit_module.file_name;
            cur_scope.loc = get_location(_unit_module);
            //if (!existed_ns)
            cur_scope.AddName(_unit_module.unit_name.idunit_name.name, cur_scope);

            if (add_doc_from_text && this.converter.controller.docs != null && this.converter.controller.docs.ContainsKey(_unit_module.unit_name))
                cur_scope.AddDocumentation(this.converter.controller.docs[_unit_module.unit_name]);
            entry_scope = cur_scope;
            if (_unit_module.unit_name.HeaderKeyword == UnitHeaderKeyword.Library)
                foreach (string file in included_files)
                {
                    DomConverter dc = CodeCompletionController.comp_modules[file] as DomConverter;
                    if (dc == null)
                    {
                        dc = new CodeCompletionController().CompileAllIfNeed(file, true);
                    }
                    if (dc.visitor != null)
                    {

                    }
                }

            // считаем основной модуль идущим первым в списке EVA
            var language = Languages.Facade.LanguageProvider.Instance.Languages.Find(lang => lang.SystemUnitNames.First() == unitName);

            if (language != null)
            {
                // добавление стандартных типов можно делать в отдельный фиктивный модуль, как в основном компиляторе
                // это позволит работать директиве DisableStandardUnits, а также не будет засорять сам стандартный модуль типами EVA
                add_standart_types(entry_scope, language.LanguageInformation);

                if (language == Languages.Facade.LanguageProvider.Instance.MainLanguage)
                {
                    AddPascalStandardProcedures();
                }
            }

            CodeCompletionController.comp_modules[_unit_module.file_name] = this.converter;

            if (!existed_ns)
            {
                foreach (string s in namespaces)
                {
                    if (!ns_cache.ContainsKey(s))
                    {
                        NamespaceScope ns_scope = new NamespaceScope(s);
                        entry_scope.AddName(s, ns_scope);
                        ns_cache[s] = s;
                    }
                }
            }

            if (currentUnitLanguage.ApplySyntaxTreeConvertersForIntellisense)
            {
                foreach (ISyntaxTreeConverter converter in currentUnitLanguage.SyntaxTreeConverters)
                {
                    _unit_module = (unit_module)converter.Convert(_unit_module, true);
                }
            }

            List<string> usedUnitsNames = new List<string>();

            interface_node _interface_node = _unit_module.interface_part;

            if (_interface_node.uses_modules != null)
            {
                usedUnitsNames = _interface_node.uses_modules.units.Select(unit => unit.name.idents[0].name).ToList();

                (cur_scope as InterfaceUnitScope).uses_source_range = get_location(_interface_node.uses_modules);

                // компиляция зависимостей из секции uses
                for (int j = _interface_node.uses_modules.units.Count - 1; j >= 0; j--)
                {
                    unit_or_namespace s = _interface_node.uses_modules.units[j];
                    CompileUsedUnitOrNamespace(s, Path.GetDirectoryName(_unit_module.file_name),
                        cur_scope, ns_cache, unl, currentUnitLanguage.CaseSensitive);
                }
            }

            // компиляция зависимостей из конструкций import и from import
            if (cur_scope != null && _unit_module.initialization_part != null)
            {
                CompileImportedDependencies(_unit_module.initialization_part, _unit_module.file_name, ns_cache, usedUnitsNames, currentUnitLanguage.CaseSensitive);
            }

            StringComparer comparer = currentUnitLanguage.CaseSensitive ? StringComparer.Ordinal : StringComparer.OrdinalIgnoreCase;

            // если это стандартный модуль, то подразумевается, что в нем явно указано какие из других стандартных модулей он использует EVA
            if (!currentUnitLanguage.SystemUnitNames.Contains(Path.GetFileNameWithoutExtension(_unit_module.file_name)))
            {
                // Добавление всех стандартных модулей EVA
                foreach (var standardUnitName in currentUnitLanguage.SystemUnitNames.Except(usedUnitsNames, comparer))
                {
                    AddStandardUnit(standardUnitName, currentUnitLanguage.CaseSensitive, currentUnitLanguage.LanguageInformation.AddStandardUnitNamesToUserScope);
                }
            }

            if (currentUnitLanguage.ApplySyntaxTreeConvertersForIntellisense)
            {
                var namesFromUsedUnits = CollectNamesFromUsedUnits(cur_scope);

                var artifacts = new CompilationArtifactsUsedBySyntaxConverters(namesFromUsedUnits);

                foreach (ISyntaxTreeConverter converter in currentUnitLanguage.SyntaxTreeConverters)
                {
                    _unit_module = (unit_module)converter.ConvertAfterUsedModulesCompilation(_unit_module, true, in artifacts);
                }
            }
            

            DateTime start_time = DateTime.Now;

            System.Diagnostics.Debug.WriteLine("intellisense parsing interface started " + System.Convert.ToInt32((DateTime.Now - start_time).TotalMilliseconds));
            if (is_namespace)
            {
                parse_only_class_headers = true;
                _unit_module.interface_part.visit(this);
                parse_only_class_headers = false;
                parse_only_method_headers = true;
                _unit_module.interface_part.visit(this);
                parse_only_method_headers = false;
                parse_only_method_bodies = true;
                _unit_module.interface_part.visit(this);
            }
            else
                _unit_module.interface_part.visit(this);
            System.Diagnostics.Debug.WriteLine("intellisense parsing interface ended " + System.Convert.ToInt32((DateTime.Now - start_time).TotalMilliseconds));

            start_time = DateTime.Now;
            System.Diagnostics.Debug.WriteLine("intellisense parsing implementation started " + System.Convert.ToInt32((DateTime.Now - start_time).TotalMilliseconds));
            if (_unit_module.implementation_part != null)
                _unit_module.implementation_part.visit(this);
            System.Diagnostics.Debug.WriteLine("intellisense parsing implementation ended " + System.Convert.ToInt32((DateTime.Now - start_time).TotalMilliseconds));
            if (_unit_module.initialization_part != null)
            {
                SymScope tmp = cur_scope;
                SymScope stmt_scope = new BlockScope(cur_scope);
                cur_scope.AddName("$block_scope", stmt_scope);
                if (_unit_module.initialization_part.left_logical_bracket != null)
                {
                    stmt_scope.loc = get_location(_unit_module.initialization_part.left_logical_bracket.source_context.Merge(_unit_module.initialization_part.right_logical_bracket.source_context));
                }
                else
                {
                    stmt_scope.loc = get_location(_unit_module.initialization_part.source_context);
                }
                cur_scope = stmt_scope;
                _unit_module.initialization_part.visit(this);
                cur_scope = tmp;
            }
            if (_unit_module.finalization_part != null)
            {
                SymScope tmp = cur_scope;
                SymScope stmt_scope = new BlockScope(cur_scope);
                cur_scope.AddName("$block_scope", stmt_scope);
                if (_unit_module.finalization_part.left_logical_bracket != null)
                {
                    stmt_scope.loc = get_location(_unit_module.finalization_part.left_logical_bracket.source_context.Merge(_unit_module.finalization_part.right_logical_bracket.source_context));
                }
                else
                {
                    stmt_scope.loc = get_location(_unit_module.finalization_part.source_context);
                }
                cur_scope = stmt_scope;
                _unit_module.finalization_part.visit(this);
                cur_scope = tmp;
            }

        }

        private Dictionary<string, HashSet<string>> CollectNamesFromUsedUnits(SymScope currentUnitScope)
        {
            var namesFromUsedUnits = new Dictionary<string, HashSet<string>>();

            foreach (var unitScope in currentUnitScope.used_units)
            {

                if (unitScope is InterfaceUnitScope interfaceScope)
                {
                    namesFromUsedUnits.Add(unitScope.Name, new HashSet<string>());

                    foreach (var symbol in unitScope.symbol_table)
                    {
                        var scopesOrScope = ((DictionaryEntry)symbol).Value;

                        string name;

                        if (scopesOrScope is List<SymScope> scopes)
                        {
                            name = scopes[0].Name;
                        }
                        else
                        {
                            name = ((SymScope)scopesOrScope).Name;
                        }

                        if (name == unitScope.Name)
                            continue;

                        namesFromUsedUnits[unitScope.Name].Add(name);
                    }
                }
            }

            return namesFromUsedUnits;
        }

        public string get_assembly_path(string name, string CompFile)
        {
        	string fname = (string.Format("{0}\\{1}",System.IO.Path.GetDirectoryName(CompFile), name)).ToLower();
        	if (System.IO.File.Exists(fname))
            	return fname;
        	return Compiler.get_assembly_path(name,true);
        }

        PascalABCCompiler.TreeRealization.using_namespace_list unl = new PascalABCCompiler.TreeRealization.using_namespace_list();
		public SymScope cur_scope;

        public static string FindPCUFileName(string UnitName, string curr_path, bool caseSensitiveSearch)
        {
        	return CodeCompletionController.comp.FindPCUFileName(UnitName, curr_path, out _, caseSensitiveSearch);
        }
        
        private void AddStandardUnit(string unitName, bool caseSensitiveSearch, bool addStandardUnitNameToCurrentScope)
        {
            string unitPath = CodeCompletionNameHelper.FindSourceFileName(unitName, out _, caseSensitiveSearch);
            if (unitPath != null)
            {
                DomConverter dc = CodeCompletionController.comp_modules[unitPath] as DomConverter;
                if (dc == null)
                {
                    CodeCompletionController ccc = new CodeCompletionController();
                    dc = ccc.CompileAllIfNeed(unitPath, true);
                    //dc.CompileAllIfNeed(unit_name);
                    if (dc.visitor != null && dc.visitor.entry_scope != null)
                    {
                        dc.visitor.entry_scope.InitAssemblies();
                        entry_scope.AddUsedUnit(dc.visitor.entry_scope);
                        
                        // стандартные типы добавляются в PABCSystem - это не требуется, поскольку они там уже есть после Compile  EVA
                        //if (unitName == StringConstants.pascalSystemUnitName)
                        //    add_standart_types(dc.visitor.entry_scope);
                        //get_standart_types(dc.stv);
                        
                        // для SPython, например, не нужно подсказывать стандартные модули в программе, это условие для этого EVA
                        if (addStandardUnitNameToCurrentScope)
                        {
                            entry_scope.AddName(unitName, dc.visitor.entry_scope);
                        }
                        else
                        {
                            dc.visitor.entry_scope.AddName(unitName, dc.visitor.entry_scope);
                        }
                        
                    }
                    CodeCompletionController.comp_modules[unitPath] = dc;

                }
                else if (dc.visitor != null && dc.visitor.entry_scope != null)
                {
                    dc.visitor.entry_scope.InitAssemblies();
                    entry_scope.AddUsedUnit(dc.visitor.entry_scope);
                    //get_standart_types(dc.stv);
                    if (addStandardUnitNameToCurrentScope)
                    {
                        entry_scope.AddName(unitName, dc.visitor.entry_scope);
                    }
                }
            }
        }

        private void CompileUsedUnitOrNamespace(unit_or_namespace s, string curr_path,
            SymScope cur_scope, Hashtable ns_cache, using_namespace_list unl, bool caseSensitiveSearch)
        {

            try
            {
                if (s is uses_unit_in uui)
                {
                    string unit_name = CodeCompletionNameHelper.FindSourceFileName(uui.in_file.Value, out _, caseSensitiveSearch, curr_path);
                    if (unit_name == null) throw new InvalidOperationException($"uses '{uui.in_file.Value}';");
                    
                    CompileUnit(unit_name, cur_scope);
                }
                else
                {
                    string usedName = "";

                    if (s.name.idents.Count == 1)
                    {
                        usedName = s.name.idents[0].name;

                        // на случай имен модулей, отличающихся от имен файла  EVA
                        string realName = GetRealNameForModule(usedName);

                        string pcu_unit_name = FindPCUFileName(realName, curr_path, caseSensitiveSearch);
                        string unit_name = CodeCompletionNameHelper.FindSourceFileName(realName, out _, caseSensitiveSearch, curr_path);

                        /*if (pcu_unit_name != null && unit_name != null && string.Compare(System.IO.Path.GetDirectoryName(_program_module.file_name), System.IO.Path.GetDirectoryName(pcu_unit_name), true) == 0
                            && string.Compare(System.IO.Path.GetDirectoryName(_program_module.file_name), System.IO.Path.GetDirectoryName(unit_name), true) != 0)
                            unit_name = null;*/
                        if (unit_name != null)
                        {
                            CompileUnit(unit_name, cur_scope);
                        }
                        else
                        {
                            unit_name = pcu_unit_name;
                            
                            if (unit_name != null)
                            {
                                IntellisensePCUReader pcu_rdr = new IntellisensePCUReader();
                                SymScope ss = pcu_rdr.GetUnit(unit_name);
                                UnitDocCache.Load(ss, unit_name);
                                cur_scope.AddUsedUnit(ss);
                                cur_scope.AddName(usedName, ss);
                            }
                            else
                            {
                                // У пространств имен Паскаля может быть разделение по точке, но этот случай не учитывается в ветке else EVA
                                if (CodeCompletionController.pabcNamespaces.ContainsKey(usedName.ToLower()))
                                {
                                    InterfaceUnitScope un_scope = CodeCompletionController.pabcNamespaces[usedName.ToLower()];
                                    cur_scope.AddUsedUnit(un_scope);
                                    cur_scope.AddName(usedName, un_scope);
                                }
                                else if (PascalABCCompiler.NetHelper.NetHelper.IsNetNamespace(usedName))
                                {
                                    var ns_scope = new NamespaceScope(usedName);
                                    ns_cache[usedName] = usedName;
                                    cur_scope.AddName(usedName, ns_scope);
                                    cur_scope.AddUsedUnit(ns_scope);
                                }
                                // Не поддерживается в основном компиляторе EVA
                                /*else if (PascalABCCompiler.NetHelper.NetHelper.IsType(usedName) && allow_import_types)
                                {
                                    Type t = PascalABCCompiler.NetHelper.NetHelper.FindType(usedName);
                                    cur_scope.AddUsedUnit(new NamespaceTypeScope(TypeTable.get_compiled_type(new SymInfo(t.Name, SymbolKind.Class, t.FullName), t)));
                                }*/
                            }
                        }
                    }
                    else
                    {
                        usedName = string.Join(".", s.name.idents.Select(id => id.name));

                        cur_scope.AddUsedUnit(new NamespaceScope(usedName));
                    }

                    unl.AddElement(new using_namespace(usedName));
                }
            }
            catch (Exception e)
            {
#if DEBUG
                File.AppendAllText("log.txt", e.Message + Environment.NewLine + e.StackTrace + Environment.NewLine);
#endif
            }
        }

        private void CompileUnit(string unit_name, SymScope cur_scope)
        {
            var dc = (DomConverter)CodeCompletionController.comp_modules[unit_name] 
                ?? new CodeCompletionController().CompileAllIfNeed(unit_name, true);

            if (dc.visitor != null)
            {
                dc.visitor.entry_scope.InitAssemblies();
                cur_scope.AddUsedUnit(dc.visitor.entry_scope);
                cur_scope.AddName(Path.GetFileNameWithoutExtension(unit_name), dc.visitor.entry_scope);
            }
        }

        private string GetRealNameForModule(string nameInUses)
        {
            // для такого пока не реализована поддержка в конверторах синтаксического дерева EVA
            /*var specialModulesAliases = Languages.Facade.LanguageProvider.Instance.Languages.SelectMany(l =>
                                    l.LanguageInformation.SpecialModulesAliases != null ? l.LanguageInformation.SpecialModulesAliases : new Dictionary<string, string>());

            if (specialModulesAliases.Count() > 0)
            {
                var foundPair = specialModulesAliases.FirstOrDefault(kv => kv.Key == str);

                if (!foundPair.Equals(default(KeyValuePair<string, string>)))
                {
                    realName = foundPair.Value;
                }
            }*/

            if (currentUnitLanguage.LanguageInformation.SpecialModulesAliases != null 
                && currentUnitLanguage.LanguageInformation.SpecialModulesAliases.TryGetValue(nameInUses, out var realName))
                return realName;
                
            return nameInUses;
        }

        private void CompileImportedUnit(string importedName, statement importStatement, as_statement_list asStatementsList, string curr_path,
            SymScope cur_scope, using_namespace_list unl, bool caseSensitiveSearch)
        {
            try
            {
                // на случай имен модулей, отличающихся от имен файла  EVA
                string realName = GetRealNameForModule(importedName);

                string pcu_unit_name = FindPCUFileName(realName, curr_path, caseSensitiveSearch);
                string unit_name = CodeCompletionNameHelper.FindSourceFileName(realName, out _, caseSensitiveSearch, curr_path);

                if (unit_name != null)
                {
                    DomConverter dc = (DomConverter)CodeCompletionController.comp_modules[unit_name]
                        ?? new CodeCompletionController().CompileAllIfNeed(unit_name, true);
       
                    if (dc.visitor != null)
                    {
                        dc.visitor.entry_scope.InitAssemblies();
                        AddImportedNamesToCurScope(importStatement, asStatementsList, cur_scope, importedName, dc.visitor.entry_scope);
                    }
                }
                else
                {
                    unit_name = pcu_unit_name;

                    if (unit_name != null)
                    {
                        IntellisensePCUReader pcu_rdr = new IntellisensePCUReader();
                        SymScope ss = pcu_rdr.GetUnit(unit_name);
                        UnitDocCache.Load(ss, unit_name);
                        AddImportedNamesToCurScope(importStatement, asStatementsList, cur_scope, importedName, ss);
                    }
                }

                unl.AddElement(new using_namespace(importedName));
            }
            catch (Exception e)
            {
#if DEBUG
                File.AppendAllText("log.txt", e.Message + Environment.NewLine + e.StackTrace + Environment.NewLine);
#endif
            }
        }

        private static void AddImportedNamesToCurScope(statement importStatement, as_statement_list asStatementsList, SymScope currentScope, string importedModuleName, SymScope importedModuleScope)
        {
            int fictiveUnitIndex = currentScope.used_units.FindIndex(unit => unit.Name == importedModuleName);

            SymScope fictiveUnit = fictiveUnitIndex > -1 ? currentScope.used_units[fictiveUnitIndex] : null;

            if (importStatement is import_statement import)
            {
                if (fictiveUnit == null)
                {
                    fictiveUnit = new InterfaceUnitScope(new SymInfo(importedModuleName, SymbolKind.Namespace, ""), null);    
                    currentScope.AddUsedUnit(fictiveUnit);
                }

                string aliasName = asStatementsList.as_statements.Find(st => st.real_name.name == importedModuleName).alias.name;

                SymScope moduleScope = importedModuleScope.CopyWithNewSymInfo();

                fictiveUnit.AddName(aliasName, moduleScope);

                // Поправляем реальное имя, которое портится в InterfaceUnitScope.AddName() EVA
                moduleScope.si.name = importedModuleName;
                moduleScope.si.aliasName = aliasName;
            }
            else if (importStatement is from_import_statement fromImport)
            {
                if (fromImport.is_star)
                {
                    if (fictiveUnit != null)
                        currentScope.used_units.RemoveAt(fictiveUnitIndex);

                    currentScope.AddUsedUnit(importedModuleScope);
                }
                else
                {
                    if (fictiveUnit == null)
                    {
                        fictiveUnit = new InterfaceUnitScope(new SymInfo(importedModuleName, SymbolKind.Namespace, ""), null);
                        currentScope.AddUsedUnit(fictiveUnit);
                    }
                    
                    foreach (var asStatement in asStatementsList.as_statements)
                    {
                        SymScope nameScope = importedModuleScope.FindNameOnlyInType(asStatement.real_name.name)?.CopyWithNewSymInfo();
                        if (nameScope != null)
                        {
                            fictiveUnit.AddName(asStatement.alias.name, nameScope);
                            // Поправляем реальное имя, которое портится в InterfaceUnitScope.AddName() EVA
                            nameScope.si.name = asStatement.real_name.name;
                            nameScope.si.aliasName = asStatement.alias.name;
                        }
                    }
                }
            }
        }

        public override void visit(program_module _program_module)
        {
            //Assembly _as = System.Reflection.Assembly.LoadFrom(get_assembly_path("mscorlib.dll",_program_module.file_name));
            string path = get_assembly_path("mscorlib.dll", _program_module.file_name);
            System.Reflection.Assembly _as = PascalABCCompiler.NetHelper.NetHelper.LoadAssembly(path);
            List<string> namespaces = new List<string>();
            PascalABCCompiler.NetHelper.NetHelper.init_namespaces(_as);
            AssemblyDocCache.Load(_as, path);

            currentUnitLanguage = Languages.Facade.LanguageProvider.Instance.SelectLanguageByName(_program_module.Language);

            // Пока что добавили возможость грубо отключить добавление NET пространств имен по умолчанию здесь EVA
            if (currentUnitLanguage.LanguageInformation.AddStandardNetNamespacesToUserScope)
                namespaces.AddRange(PascalABCCompiler.NetHelper.NetHelper.GetNamespaces(_as));
            
            //List<Scope> netScopes = new List<Scope>();
            //PascalABCCompiler.NetHelper.NetScope ns=new PascalABCCompiler.NetHelper.NetScope(unl,_as,tcst);
            InterfaceUnitScope unit_scope = null;
            cur_scope = unit_scope = new InterfaceUnitScope(new SymInfo(_program_module.program_name != null ? _program_module.program_name.prog_name.name : "", SymbolKind.Namespace, "program"), null);
            CodeCompletionController.comp_modules[_program_module.file_name] = this.converter;
            Stack<Position> regions_stack = new Stack<Position>();
            if (CodeCompletionController.comp != null && CodeCompletionController.comp.CompilerOptions.CurrentProject != null && CodeCompletionController.comp.CompilerOptions.CurrentProject.ContainsSourceFile(_program_module.file_name))
            {
                IReferenceInfo[] refs = CodeCompletionController.comp.CompilerOptions.CurrentProject.References;
                if (_program_module.compiler_directives == null)
                    _program_module.compiler_directives = new List<PascalABCCompiler.SyntaxTree.compiler_directive>();
                foreach (IReferenceInfo ri in refs)
                {
                    _program_module.compiler_directives.Add
                        (new PascalABCCompiler.SyntaxTree.compiler_directive(new token_info("reference"), new token_info(ri.FullAssemblyName)));
                }
            }
            List<string> included_files = new List<string>();
            if (_program_module.compiler_directives != null)
                foreach (PascalABCCompiler.SyntaxTree.compiler_directive dir in _program_module.compiler_directives)
                {
#if DEBUG
                    // SSM test 05.08.17
                    if (dir == null)
                        File.AppendAllText("log.txt", "dir == null" + Environment.NewLine + _program_module.compiler_directives.Count + Environment.NewLine);
#endif
                    if (dir.Name.text.ToLower() == "reference")
                    {
                        try
                        {
                            //System.Reflection.Assembly assm = System.Reflection.Assembly.LoadFrom(get_assembly_path(dir.Directive.text,_program_module.file_name));
                            path = get_assembly_path(dir.Directive.text, _program_module.file_name);
                            System.Reflection.Assembly assm = PascalABCCompiler.NetHelper.NetHelper.LoadAssembly(path);
                            if (assm != null)
                            {
                                PascalABCCompiler.NetHelper.NetHelper.init_namespaces(assm);
                                AssemblyDocCache.Load(assm, path);
                                namespaces.AddRange(PascalABCCompiler.NetHelper.NetHelper.GetNamespaces(assm));
                                unit_scope.AddReferencedAssembly(assm);
                            }
                        }
                        catch (Exception e)
                        {

                        }
                    }
                    else
                    if (dir.Name.text.ToLower() == "region")
                    {
                        if (cur_scope.regions == null)
                            cur_scope.regions = new List<Position>();
                        regions_stack.Push(new Position(dir.source_context.begin_position.line_num, dir.source_context.begin_position.column_num, dir.source_context.end_position.line_num, dir.source_context.end_position.column_num, dir.source_context.FileName, dir.Directive.text));
                    }
                    else if (dir.Name.text.ToLower() == "endregion")
                    {
                        if (regions_stack.Count > 0)
                        {
                            Position pos = regions_stack.Pop();
                            if (cur_scope.regions != null)
                            {
                                cur_scope.regions.Add(new Position(pos.line, pos.column - 1, dir.source_context.end_position.line_num, dir.source_context.end_position.column_num, pos.file_name, pos.fold_text));
                            }
                        }
                    }
                    else if (dir.Name.text.ToLower() == "includenamespace")
                    {
                        string directive = dir.Directive.text.Replace('/', Path.DirectorySeparatorChar).Replace('\\', Path.DirectorySeparatorChar);
                        Compiler.TryThrowInvalidPath(directive, dir.source_context);

                        if (directive == "*.pas" || directive.EndsWith(Path.DirectorySeparatorChar + "*.pas"))
                        {
                            string udir = Path.Combine(Path.GetDirectoryName(_program_module.file_name), directive.Replace(Path.DirectorySeparatorChar + "*.pas", ""));
                            foreach (string file in Directory.EnumerateFiles(udir, "*.pas"))
                                included_files.Add(file);
                        }
                        else
                            included_files.Add(Path.Combine(Path.GetDirectoryName(_program_module.file_name), directive));
                    }
                }

            doc = new document(_program_module.file_name);
            cur_scope.loc = get_location(_program_module);
            cur_scope.file_name = _program_module.file_name;
            entry_scope = cur_scope;
            if (_program_module.program_name != null)
            {
                cur_scope.head_loc = get_location(_program_module.program_name);
                cur_scope.AddName(_program_module.program_name.prog_name.name, cur_scope);
            }


            Hashtable ns_cache = new Hashtable(StringComparer.CurrentCultureIgnoreCase);
            foreach (string file in included_files)
            {
                DomConverter dc = CodeCompletionController.comp_modules[file] as DomConverter;
                if (dc == null)
                {
                    dc = new CodeCompletionController().CompileAllIfNeed(file, true);
                }
                if (dc.visitor != null)
                {

                }
            }

            if (currentUnitLanguage.ApplySyntaxTreeConvertersForIntellisense)
            {
                foreach (ISyntaxTreeConverter converter in currentUnitLanguage.SyntaxTreeConverters)
                {
                    _program_module = (program_module)converter.Convert(_program_module, true);
                }
            }

            List<string> usedUnitsNames = new List<string>();

            if (_program_module.used_units != null)
            {
                usedUnitsNames = _program_module.used_units.units.Select(unit => unit.name.idents[0].name).ToList();

                unit_scope.uses_source_range = get_location(_program_module.used_units);

                // компиляция зависимостей из секции uses
                for (int j = _program_module.used_units.units.Count - 1; j >= 0; j--)
                {
                    unit_or_namespace s = _program_module.used_units.units[j];
                    CompileUsedUnitOrNamespace(s, Path.GetDirectoryName(_program_module.file_name),
                        cur_scope, ns_cache, unl, currentUnitLanguage.CaseSensitive);
                }
            }

            // компиляция зависимостей из конструкций import и from import
            if (cur_scope != null && _program_module.program_block.program_code != null)
            {
                CompileImportedDependencies(_program_module.program_block.program_code, _program_module.file_name, ns_cache, usedUnitsNames, currentUnitLanguage.CaseSensitive);
            }

            StringComparer comparer = currentUnitLanguage.CaseSensitive ? StringComparer.Ordinal : StringComparer.OrdinalIgnoreCase;

            // Добавление всех стандартных модулей EVA
            foreach (var unitName in currentUnitLanguage.SystemUnitNames.Except(usedUnitsNames, comparer))
            {
                AddStandardUnit(unitName, currentUnitLanguage.CaseSensitive, currentUnitLanguage.LanguageInformation.AddStandardUnitNamesToUserScope);
            }

            foreach (string s in namespaces)
            {
                if (!ns_cache.ContainsKey(s))
                {
                    NamespaceScope ns_scope = new NamespaceScope(s);
                    cur_scope.AddName(s, ns_scope);
                    ns_cache[s] = s;
                }
            }

            if (currentUnitLanguage.ApplySyntaxTreeConvertersForIntellisense)
            {
                var namesFromUsedUnits = CollectNamesFromUsedUnits(cur_scope);

                var artifacts = new CompilationArtifactsUsedBySyntaxConverters(namesFromUsedUnits);

                foreach (ISyntaxTreeConverter converter in currentUnitLanguage.SyntaxTreeConverters)
                {
                    _program_module = (program_module)converter.ConvertAfterUsedModulesCompilation(_program_module, true, in artifacts);
                }
            }

            //PascalABCCompiler.TreeRealization.common_type_node ctn = new ;
            if (_program_module.program_block.defs != null)
                foreach (declaration decl in _program_module.program_block.defs.defs)
                {
                    try
                    {
                        decl.visit(this);
                    }
                    catch (Exception e)
                    {
#if DEBUG
                        File.AppendAllText("log.txt", e.Message + Environment.NewLine + e.StackTrace + Environment.NewLine);
#endif
                    }
                }
            if (cur_scope != null && _program_module.program_block.program_code != null)
            {
                var left_line_num = _program_module.program_block.program_code.left_logical_bracket.source_context != null ? _program_module.program_block.program_code.left_logical_bracket.source_context.end_position.line_num : 1;
                var left_column_num = _program_module.program_block.program_code.left_logical_bracket.source_context != null ? _program_module.program_block.program_code.left_logical_bracket.source_context.end_position.column_num : 1;
                var right_line_num = _program_module.program_block.program_code.source_context.end_position.line_num;
                var right_column_num = _program_module.program_block.program_code.source_context.end_position.column_num;
                if (_program_module.program_block.program_code.right_logical_bracket == null || _program_module.program_block.program_code.right_logical_bracket.source_context == null)
                {
                    right_line_num += 2;
                    right_column_num += 2;
                    _program_module.program_block.program_code.source_context = new SourceContext(_program_module.program_block.program_code.source_context.begin_position.line_num,
                               _program_module.program_block.program_code.source_context.begin_position.column_num, right_line_num, right_column_num);
                }
                cur_scope.body_loc = new location(left_line_num,
                                                  left_column_num,
                                                  right_line_num, right_column_num,
                                                 doc);
                cur_scope.loc = new location(cur_scope.loc.begin_line_num, cur_scope.loc.begin_column_num, right_line_num, right_column_num, doc);
                _program_module.program_block.program_code.visit(this);
            }
        }

        private void CompileImportedDependencies(statement_list statementList, string fileName, Hashtable ns_cache, List<string> usedUnitNames, bool caseSensitiveSearch)
        {
            var importStatements = statementList.list.Where(st => st is import_statement || st is from_import_statement);

            foreach (var importStatement in importStatements.Reverse())
            {
                if (importStatement is import_statement import)
                {
                    foreach (var unitNode in import.modules_names.as_statements.Select(st => st.real_name).Reverse())
                    {
                        CompileImportedUnit(unitNode.name, import, import.modules_names,
                            Path.GetDirectoryName(fileName),
                            cur_scope, unl, caseSensitiveSearch);

                        usedUnitNames.Add(unitNode.name);
                    }
                }
                else if (importStatement is from_import_statement fromImport)
                {
                    CompileImportedUnit(fromImport.module_name.name, fromImport, fromImport.imported_names,
                        Path.GetDirectoryName(fileName),
                        cur_scope, unl, caseSensitiveSearch);

                    usedUnitNames.Add(fromImport.module_name.name);
                }
            }
        }

        private void add_standart_types(SymScope cur_scope, ILanguageInformation languageInfo)
        {

            var standardTypesData = new List<Tuple<PascalABCCompiler.Parsers.KeywordKind, CompiledScope>>()
            {
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.ObjectType, TypeTable.obj_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.IntType, TypeTable.int_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.DoubleType, TypeTable.real_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.StringType, TypeTable.string_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.CharType, TypeTable.char_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.BoolType, TypeTable.bool_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.ByteType, TypeTable.byte_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.ShortType, TypeTable.int16_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.SByteType, TypeTable.sbyte_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.UShortType, TypeTable.uint16_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.UIntType, TypeTable.uint32_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.Int64Type, TypeTable.int64_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.UIntType, TypeTable.uint32_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.UInt64Type, TypeTable.uint64_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.FloatType, TypeTable.float_type),
                Tuple.Create(PascalABCCompiler.Parsers.KeywordKind.PointerType, TypeTable.ptr_type)
            };

            foreach (var data in standardTypesData)
            {
                var keywordKind = data.Item1;
                var type = data.Item2;

                var type_name = languageInfo.GetStandardTypeByKeyword(keywordKind);

                if (type_name != null)
                {
                    var typeClone = TypeTable.StandardTypeClone(type);

                    cur_scope.AddName(type_name, typeClone);
                }
            }
        }

        public void AddPascalStandardProcedures()
        {
            ProcScope ps = new ProcScope(StringConstants.set_length_procedure_name, null);
            ps.AddParameter(new ElementScope(new SymInfo("arr", SymbolKind.Parameter, "arr"), new ArrayScope(), null, ps));
            ps.parameters[0].param_kind = parametr_kind.var_parametr;
            ps.AddParameter(new ElementScope(new SymInfo("length", SymbolKind.Parameter, "length"), TypeTable.int_type, null, ps));
            ps.Complete();
            cur_scope.AddName(StringConstants.set_length_procedure_name, ps);
            cur_scope.AddName(StringConstants.true_const_name, new ElementScope(new SymInfo(StringConstants.true_const_name, SymbolKind.Constant, StringConstants.true_const_name), TypeTable.bool_type, true, null));
            cur_scope.AddName(StringConstants.false_const_name, new ElementScope(new SymInfo(StringConstants.false_const_name, SymbolKind.Constant, StringConstants.false_const_name), TypeTable.bool_type, false, null));
            ps = new ProcScope(StringConstants.new_procedure_name, null);
            ElementScope prm = new ElementScope(new SymInfo("p", SymbolKind.Parameter, "p"), TypeTable.ptr_type, null, ps);
            prm.param_kind = parametr_kind.var_parametr;
            ps.AddParameter(prm);
            ps.Complete();
            cur_scope.AddName(StringConstants.new_procedure_name, ps);
            ps = new ProcScope(StringConstants.dispose_procedure_name, null);
            prm = new ElementScope(new SymInfo("p", SymbolKind.Parameter, "p"), TypeTable.ptr_type, null, ps);
            prm.param_kind = parametr_kind.var_parametr;
            ps.AddParameter(prm);
            ps.Complete();
            cur_scope.AddName(StringConstants.dispose_procedure_name, ps);

            ps = new ProcScope(StringConstants.IncProcedure, null);
            prm = new ElementScope(new SymInfo("i", SymbolKind.Parameter, "i"), TypeTable.int16_type, null, ps);
            prm.param_kind = parametr_kind.var_parametr;
            ps.AddParameter(prm);
            ps.Complete();
            ps.si.not_include = true;
            cur_scope.AddName(StringConstants.IncProcedure, ps);

            ps = new ProcScope(StringConstants.IncProcedure, null);
            prm = new ElementScope(new SymInfo("i", SymbolKind.Parameter, "i"), TypeTable.uint16_type, null, ps);
            prm.param_kind = parametr_kind.var_parametr;
            ps.AddParameter(prm);
            ps.Complete();
            ps.si.not_include = true;
            cur_scope.AddName(StringConstants.IncProcedure, ps);

            ps = new ProcScope(StringConstants.IncProcedure, null);
            prm = new ElementScope(new SymInfo("i", SymbolKind.Parameter, "i"), TypeTable.sbyte_type, null, ps);
            prm.param_kind = parametr_kind.var_parametr;
            ps.AddParameter(prm);
            ps.Complete();
            ps.si.not_include = true;
            cur_scope.AddName(StringConstants.IncProcedure, ps);

            ps = new ProcScope(StringConstants.IncProcedure, null);
            prm = new ElementScope(new SymInfo("i", SymbolKind.Parameter, "i"), TypeTable.int64_type, null, ps);
            prm.param_kind = parametr_kind.var_parametr;
            ps.AddParameter(prm);
            ps.Complete();
            ps.si.not_include = true;
            cur_scope.AddName(StringConstants.IncProcedure, ps);

            ps = new ProcScope(StringConstants.IncProcedure, null);
            prm = new ElementScope(new SymInfo("i", SymbolKind.Parameter, "i"), TypeTable.uint64_type, null, ps);
            prm.param_kind = parametr_kind.var_parametr;
            ps.AddParameter(prm);
            ps.Complete();
            ps.si.not_include = true;
            cur_scope.AddName(StringConstants.IncProcedure, ps);

            ps = new ProcScope(StringConstants.IncProcedure, null);
            prm = new ElementScope(new SymInfo("i", SymbolKind.Parameter, "i"), TypeTable.uint32_type, null, ps);
            prm.param_kind = parametr_kind.var_parametr;
            ps.AddParameter(prm);
            ps.Complete();
            ps.si.not_include = true;
            cur_scope.AddName(StringConstants.IncProcedure, ps);
        }

        public override void visit(hex_constant _hex_constant)
        {
            //throw new Exception("The method or operation is not implemented.");
            returned_scope = TypeTable.uint64_type;//entry_scope.FindName(StringConstants.ulong_type_name);
            cnst_val.prim_val = _hex_constant.val;
        }

        public override void visit(get_address _get_address)
        {
            //throw new Exception("The method or operation is not implemented.");
            _get_address.address_of.visit(this);
            if (returned_scope != null && returned_scope is TypeScope)
            {
            	returned_scope = new PointerScope(returned_scope as TypeScope);
            }
            else returned_scope = null;
        }

        public override void visit(case_variant _case_variant)
        {
            //throw new Exception("The method or operation is not implemented.");
        }
		
        public override void visit(compiler_directive_if _compiler_directive_if)
        {
        	
        }
        
        public override void visit(compiler_directive_list _compiler_directive_list)
        {
        	
        }

        public override void visit(case_node _case_node)
        {
            if (_case_node.conditions != null)
                for (int i = 0; i < _case_node.conditions.variants.Count; i++)
                    _case_node.conditions.variants[i].exec_if_true.visit(this);
            if (_case_node.else_statement != null)
                _case_node.else_statement.visit(this);
        }

        public override void visit(method_name _method_name)
        {
        	if (_method_name.meth_name is operator_name_ident)
        		_method_name.meth_name.visit(this);
        	else
                meth_name = _method_name.meth_name.name;
        }

        public override void visit(dot_node _dot_node)
        {
            bool tmp = search_all;
        	search_all = false;
        	_dot_node.left.visit(this);
            search_all = tmp;
        	if (returned_scope != null)
			{
				if (_dot_node.right is ident)
				{
					if (!search_all)
					{
                        if (returned_scope is NamespaceScope)
                        {
                            returned_scope = returned_scope.FindNameOnlyInType((_dot_node.right as ident).name);
                            return;
                        }
                        if (returned_scope is InterfaceUnitScope)
                        {
                            returned_scope = returned_scope.FindNameOnlyInType((_dot_node.right as ident).name);
                        }
                        else
                        {
                            TypeScope ts = returned_scope as TypeScope;
                            if (returned_scope is ProcScope)
                                ts = (returned_scope as ProcScope).return_type;
                            if (ts != null)
                                returned_scope = ts.FindNameOnlyInType((_dot_node.right as ident).name);
                            if (returned_scope == null)
                            {
                                List<ProcScope> meths = entry_scope.GetExtensionMethods((_dot_node.right as ident).name, ts);
                                if (meths.Count > 0)
                                {
                                    method_call mc = new method_call(_dot_node, new expression_list());
                                    search_all = true;
                                    mc.visit(this);
                                    return;
                                }

                            }
                            else if (returned_scope is ProcScope)
                            {
                                method_call mc = new method_call(_dot_node, new expression_list());
                                search_all = true;
                                mc.visit(this);
                                return;
                            }
                        }
                        
                        if (returned_scope != null && returned_scope is ProcScope && (returned_scope as ProcScope).return_type != null)
						{
                            ProcScope ps = returned_scope as ProcScope;
                            if (ps.parameters.Count == 0 || ps.is_extension || ps.parameters[0].param_kind == parametr_kind.params_parametr || ps.parameters[0].cnst_val != null)
                                returned_scope = ps.return_type;
							return;
						}
						else if (returned_scope is ElementScope)
						{
                            ElementScope es = returned_scope as ElementScope;
							this.cnst_val.prim_val = es.cnst_val;
							returned_scope = es.sc;
                            if (es.IsIndexedProperty)
                                returned_scope = new IndexedPropertyType(es.sc as TypeScope);
							return;
						}
						else if (returned_scope is TypeScope)
							is_type = true;
                        else if (returned_scope is ProcScope && (returned_scope as ProcScope).is_constructor)
                        {
                            returned_scope = (returned_scope as ProcScope).declaringType;
                            return;
                        }
					}
					else
					{
                        TypeScope ts = returned_scope as TypeScope;
                        if (returned_scope is ProcScope)
                            ts = (returned_scope as ProcScope).return_type;
                        returned_scopes = returned_scope.FindOverloadNamesOnlyInType((_dot_node.right as ident).name);
                        if (ts != null)
                        {
                            List<ProcScope> meths = entry_scope.GetExtensionMethods((_dot_node.right as ident).name, ts);
                            if (meths.Count > 0)
                            {
                                if (returned_scopes == null)
                                    returned_scopes = new List<SymScope>();
                                foreach (ProcScope meth in meths)
                                    returned_scopes.Add(meth);
                            }
                        }
                        search_all = false;
					}
				}
			}
        }

        public override void visit(PascalABCCompiler.SyntaxTree.empty_statement _empty_statement)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(PascalABCCompiler.SyntaxTree.goto_statement _goto_statement)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(PascalABCCompiler.SyntaxTree.labeled_statement _labeled_statement)
        {
            //throw new Exception("The method or operation is not implemented.");
            if (_labeled_statement.to_statement != null)
            	_labeled_statement.to_statement.visit(this);
        }
		
        private bool is_type = false;
        
        public override void visit(with_statement _with_statement)
        {
            //throw new Exception("The method or operation is not implemented.");
            SymScope tmp = cur_scope;
            WithScope ws = new WithScope(cur_scope);
            for (int i=_with_statement.do_with.expressions.Count-1; i>=0; i--)
            {
            	is_type = false;
            	_with_statement.do_with.expressions[i].visit(this);
            	if (returned_scope != null)
            	{
            		ws.AddWithScope(returned_scope,is_type);
            	}
            	is_type = false;
            }
            cur_scope.AddName("$with_block",ws);
            ws.loc = get_location(_with_statement);
            cur_scope = ws;
            _with_statement.what_do.visit(this);
            cur_scope = tmp;
        }

        internal static bool is_good_overload(ProcScope ps, List<SymScope> args)
        {
            if (ps.parameters == null || ps.parameters.Count == 0)
                if (args.Count == 0)
                    return true;
                else
                    return false;
            if (args.Count == 0)
                if (ps.parameters.Count == 1 && ps.parameters[0].param_kind == parametr_kind.params_parametr)
                    return true;
                else if (ps.IsExtension && ps.parameters.Count == 1)
                    return true;
                else
                    return false;
            if (args.Count == ps.parameters.Count || ps.IsExtension && args.Count == ps.parameters.Count - 1)
            {
                int off = 0;
                if (ps.IsExtension && args.Count == ps.parameters.Count - 1)
                    off = 1;
                for (int i = 0; i < args.Count; i++)
                {
                    if (args[i] is UnknownScope)
                        continue;
                    if (!(args[i] is TypeScope))
                        return false;
                    TypeScope ts = args[i] as TypeScope;
                    ElementScope parameter = ps.parameters[i + off];
                    if (!ts.IsConvertable(parameter.sc as TypeScope))
                    {
                        if (parameter.param_kind == parametr_kind.params_parametr)
                        {
                            if (!(parameter.sc is TypeScope && (parameter.sc as TypeScope).IsArray && ts.IsConvertable((parameter.sc as TypeScope).elementType)))
                                return false;
                        }
                        else
                            return false;
                    }
                    if (parameter.param_kind == parametr_kind.var_parametr || parameter.param_kind == parametr_kind.const_parametr)
                    {
                        TypeScope param_ts = parameter.sc as TypeScope;
                        if (param_ts is CompiledScope && ps is CompiledMethodScope)
                            param_ts = param_ts.GetElementType();
                        if (param_ts == null || !ts.IsEqual(param_ts))
                            return false;
                    }
                }
                return true;
            }
            else
            {
                //if (args.Count < ps.parameters.Count)
                //    return false;
                int min_arg_cnt = Math.Min(args.Count, ps.parameters.Count);

                for (int i = 0; i < min_arg_cnt; i++)
                {
                    if (!(args[i] is TypeScope))
                        return false;
                    TypeScope ts = args[i] as TypeScope;
                    if (!ts.IsConvertable(ps.parameters[i].sc as TypeScope))
                    {
                        if (ps.parameters[i].param_kind == parametr_kind.params_parametr)
                        {
                            TypeScope pts = ps.parameters[i].sc as TypeScope;
                            if (!(pts != null && pts.elementType != null && ts.IsConvertable(pts.elementType)))
                                return false; 
                        }
                        else
                            return false;
                    }
                    //else if (args.Count > ps.parameters.Count && i == min_arg_cnt - 1 && ps.parameters[i].param_kind != parametr_kind.params_parametr)
                    //    return false;
                }
                if (args.Count < ps.parameters.Count)
                {
                    for (int i = min_arg_cnt; i < ps.parameters.Count; i++)
                    {
                        if (ps.parameters[i].cnst_val != null || ps.parameters[i].param_kind == parametr_kind.params_parametr && i == ps.parameters.Count - 1)
                            return true;
                        else
                            return false;
                    }
                }
                else if (args.Count > ps.parameters.Count)
                {
                    for (int i = min_arg_cnt; i < args.Count; i++)
                    {
                        if (ps.parameters[min_arg_cnt - 1].param_kind == parametr_kind.params_parametr)
                        {
                            if (!(args[i] is TypeScope))
                                return false;
                            TypeScope ts = args[i] as TypeScope;
                            TypeScope pts = ps.parameters[min_arg_cnt - 1].sc as TypeScope;
                            if (!(pts != null && pts.elementType != null && ts.IsConvertable(pts.elementType)))
                                return false;
                                
                        }
                        else
                            return false;
                    }
                }
                return true;
            }
        }

        internal static bool is_good_exact_overload(ProcScope ps, List<SymScope> args)
        {
            if (ps.parameters == null || ps.parameters.Count == 0)
                if (args.Count == 0)
                    return true;
                else
                    return false;
            if (args.Count == 0)
                if (ps.parameters.Count == 1 && ps.parameters[0].param_kind == parametr_kind.params_parametr)
                    return true;
                else
                    return false;
            if (args.Count == ps.parameters.Count || ps.IsExtension && args.Count == ps.parameters.Count - 1)
            {
                int off = 0;
                if (ps.IsExtension && args.Count == ps.parameters.Count - 1)
                    off = 1;
                for (int i = 0; i < args.Count; i++)
                {
                    if (!(args[i] is TypeScope))
                        return false;
                    TypeScope ts = args[i] as TypeScope;
                    ElementScope parameter = ps.parameters[i + off];
                    if (ps.IsExtension && i == 0 && ts.IsEqual((parameter.sc as TypeScope).GetElementType()))
                        continue;
                    if (!ts.IsEqual(parameter.sc as TypeScope))
                    {
                        if (parameter.param_kind == parametr_kind.params_parametr)
                        {
                            TypeScope pts = parameter.sc as TypeScope;
                            if (!(pts != null && pts.elementType != null && ts.IsEqual(pts.elementType)))
                                return false;
                        }
                        else
                            return false;
                    }
                }
                return true;
            }
            else
            {
                if (args.Count < ps.parameters.Count)
                    return false;
                int min_arg_cnt = Math.Min(args.Count, ps.parameters.Count);

                for (int i = 0; i < min_arg_cnt; i++)
                {
                    if (!(args[i] is TypeScope))
                        return false;
                    TypeScope ts = args[i] as TypeScope;
                    if (!ts.IsEqual(ps.parameters[i].sc as TypeScope))
                    {
                        if (ps.parameters[i].param_kind == parametr_kind.params_parametr)
                        {
                            TypeScope pts = ps.parameters[i].sc as TypeScope;
                            if (!(pts != null && pts.elementType != null && ts.IsEqual(pts.elementType)))
                                return false;
                        }
                        else
                            return false;
                    }
                    else if (i == ps.parameters.Count - 1 && ps.parameters[i].param_kind != parametr_kind.params_parametr)
                        return false;

                }
                return true;
            }
        }

        private SymScope[] selected_methods = null;
        private bool disable_lambda_compilation = false;

        private ProcScope select_method(SymScope[] meths, TypeScope tleft, TypeScope tright, TypeScope obj, bool obj_instanced, List<SymScope> arg_types, params expression[] args)
        {
            if (arg_types == null)
                arg_types = new List<SymScope>();
            List<TypeScope> arg_types2 = new List<TypeScope>();
            SymScope[] saved_selected_methods = selected_methods;
            selected_methods = meths;
            if (arg_types.Count > 0)
            {
                foreach (TypeScope ts in arg_types)
                    arg_types2.Add(ts);
            }
            else if (tleft != null || tright != null)
            {
                if (tleft != null)
                {
                    arg_types.Add(tleft);
                    arg_types2.Add(tleft);
                }
                if (tright != null)
                {
                    arg_types.Add(tright);
                    arg_types2.Add(tright);
                }
            }
            else if (args != null)
            {
                bool tmp_disable_lambda_compilation = disable_lambda_compilation;
                disable_lambda_compilation = true;
                foreach (expression e in args)
                {
                    e.visit(this);
                    returned_scopes.Clear();
                    arg_types.Add(returned_scope);
                    arg_types2.Add(returned_scope as TypeScope);
                }
                disable_lambda_compilation = false;
                disable_lambda_compilation = tmp_disable_lambda_compilation;
            }
            selected_methods = saved_selected_methods;
            List<ProcScope> good_procs = new List<ProcScope>();
            for (int i = 0; i < meths.Length; i++)
            {
                if (meths[i] is ProcScope)
                {
                    if (is_good_overload(meths[i] as ProcScope, arg_types))
                        good_procs.Add(meths[i] as ProcScope);
                }
                else if (meths[i] is ProcType)
                {
                    if (is_good_overload((meths[i] as ProcType).target, arg_types))
                        good_procs.Add((meths[i] as ProcType).target);
                }
            }
            if (good_procs.Count > 1)
                for (int i = 0; i < good_procs.Count; i++)
                    if (DomSyntaxTreeVisitor.is_good_exact_overload(good_procs[i] as ProcScope, arg_types))
                        return good_procs[i].GetInstance(arg_types2);
            if (good_procs.Count == 0)
            {
                for (int i = 0; i < meths.Length; i++)
                {
                    if (meths[i] is ProcScope)
                    {
                        if (obj != null && !(meths[i] as ProcScope).IsStatic)
                        {
                            good_procs.Add(meths[i] as ProcScope);
                        }
                    }
                }
            }
            /*if (good_procs.Count == 0)
            {
                for (int i = 0; i < meths.Length; i++)
                {
                    if (meths[i] is ProcScope)
                    {
                        if ((meths[i] as ProcScope).parameters.Count == arg_types.Count)
                        {
                            good_procs.Add(meths[i] as ProcScope);
                            break;
                        }
                    }
                }
            }*/
            if (good_procs.Count > 0)
            {
                if (obj != null)
                {
                    if (!obj_instanced && obj.GetElementType() != null && good_procs[0].IsExtension && !(good_procs[0].parameters[0].sc is TemplateParameterScope))
                        obj = obj.GetElementType();
                    arg_types2.Insert(0, obj);
                    arg_types.Insert(0, obj);
                    for (int i = 0; i < good_procs.Count; i++)
                        if (DomSyntaxTreeVisitor.is_good_exact_overload(good_procs[i] as ProcScope, arg_types))
                            return good_procs[i].GetInstance(arg_types2);
                }
                
                return good_procs[0].GetInstance(arg_types2);
            }
            return null;
        }

        public override void visit(method_call _method_call)
        {
            if (method_call_cache.ContainsKey(_method_call))
            {
                returned_scope = method_call_cache[_method_call];
                return;
            }
            search_all = true;
            returned_scope = null;
            _method_call.dereferencing_value.visit(this);
            search_all = false;
            this.cnst_val.prim_val = null;
            SymScope[] names = returned_scopes.ToArray();
            List<expression> parameters = new List<expression>();
            TypeScope obj = null;
            bool obj_instanced = false;
            if (names.Length > 0 && names[0] is TypeScope)
            {
                returned_scope = names[0];
                method_call_cache.Add(_method_call, returned_scope);
                return;
            }
            foreach (SymScope ss in names)
            {
                if (ss is ProcScope && (ss as ProcScope).is_extension)
                {
                    ProcScope proc = ss as ProcScope;
                    if (_method_call.dereferencing_value is dot_node)
                    {
                        (_method_call.dereferencing_value as dot_node).left.visit(this);
                        obj = returned_scope as TypeScope;
                        if (obj != null && proc.parameters != null && proc.parameters.Count > 0 && !(proc.parameters[0].sc is TemplateParameterScope || proc.parameters[0].sc is UnknownScope))
                        {
                            TypeScope param_type = proc.parameters[0].sc as TypeScope;
                            if (obj.implemented_interfaces != null)
                            {
                                foreach (TypeScope interf in obj.implemented_interfaces)
                                {
                                    if (interf.original_type != null && param_type.original_type != null && interf.original_type == param_type.original_type)
                                    {
                                        List<TypeScope> generic_args = interf.GetInstances();
                                        if (generic_args != null && generic_args.Count > 0)
                                        {
                                            obj = generic_args[0];
                                            obj_instanced = true;
                                        }
                                            
                                    }
                                }
                            }
                        }
                    }
                }
            }
            if (_method_call.parameters != null)
            {
                parameters.AddRange(_method_call.parameters.expressions);
            }
            List<TypeScope> lambda_types = new List<TypeScope>();
            List<SymScope> param_types = new List<SymScope>();
            ProcScope ps = select_method(names, null, null, obj, obj_instanced, param_types, parameters.ToArray());
            bool has_lambda = false;

            if (_method_call.parameters != null && ps != null)
                for (int i = 0; i < _method_call.parameters.expressions.Count; i++)
                {
                    expression e = _method_call.parameters.expressions[i];
                    if (e is function_lambda_definition)
                    {
                        TypeScope tmp_awaitedProcType = awaitedProcType;
                        if (ps.parameters != null && ps.parameters.Count > i + (ps.IsExtension ? 1 : 0))
                            awaitedProcType = ps.parameters[i + (ps.IsExtension ? 1 : 0)].sc as TypeScope;
                        bool tmp_disable_lambda_compilation = disable_lambda_compilation;
                        disable_lambda_compilation = false;
                        e.visit(this);
                        disable_lambda_compilation = tmp_disable_lambda_compilation;
                        awaitedProcType = tmp_awaitedProcType;
                        has_lambda = true;
                        param_types[obj == null ? i : i + 1] = returned_scope;
                    }
                }
            if (has_lambda)
                ps = select_method(names, null, null, obj, obj_instanced, param_types, parameters.ToArray());
            returned_scopes.Clear();

            if (ps != null)
            {
                if (ps.return_type != null)
                {
                    if (ps.name == "Copy" && ps.return_type.Name == "Array" && _method_call.parameters.expressions.Count > 0)
                    {
                        _method_call.parameters.expressions[0].visit(this);

                    }
                    else
                    {
                        returned_scope = ps.return_type;
                        if (ps.return_type.lazy_instance)
                            returned_scope = ps.return_type.original_type.GetInstance(ps.return_type.instances);
                    }
                        
                }
                else if (ps.is_constructor)
                    returned_scope = ps.declaringType;
                else
                    returned_scope = null;
            }
            else if (names.Length > 0)
            {
                returned_scope = null;
                foreach (SymScope ss in names)
                    if (ss is ProcScope)
                    {
                        ps = ss as ProcScope;
                        if (ps.return_type != null)
                        {
                            returned_scope = ps.return_type;
                            if (ps.IsExtension && ps.IsGeneric() && obj != null)
                            {
                                TypeScope elem_ts = obj.GetElementType();
                                if (elem_ts == null)
                                    elem_ts = obj;
                                returned_scope = ps.return_type.GetInstance(new List<TypeScope>() { elem_ts });
                            }
                            break;
                        }
                        else
                            returned_scope = null;
                    }
                    else if (ss is TypeScope)
                    {
                        returned_scope = ss;
                    }
            }
            method_call_cache.Add(_method_call, returned_scope);
            cnst_val.prim_val = null;
        }

        public override void visit(pascal_set_constant _pascal_set_constant)
        {
            TypeScope element_type = null;
            List<TypeScope> element_types = new List<TypeScope>();
            if (_pascal_set_constant.values != null)
                foreach (expression ex in _pascal_set_constant.values.expressions)
                {
                    ex.visit(this);
                    if (returned_scope != null && returned_scope is TypeScope)
                        element_types.Add(returned_scope as TypeScope);
                }
            if (element_types.Count > 0)
            {
                element_type = element_types[0];
                for (int i = 1; i < element_types.Count; i++)
                {
                    if (element_type.IsConvertable(element_types[i], true))
                        element_type = element_types[i];
                    else if (!element_types[i].IsConvertable(element_type, true))
                    {
                        element_type = TypeTable.obj_type;
                        break;
                    }
                    //else element_type = TypeTable.obj_type;
                }
            }
            
            if (element_type != null)
                returned_scope = new SetScope(element_type);
            else
                returned_scope = cur_scope.FindName(StringConstants.set_name);
            cnst_val.prim_val = null;
        }

        public override void visit(PascalABCCompiler.SyntaxTree.array_const _array_const)
        {
            //throw new Exception("The method or operation is not implemented.");
            cnst_val.prim_val = null;
        }

        public override void visit(write_accessor_name _write_accessor_name)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(read_accessor_name _read_accessor_name)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(property_accessors _property_accessors)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(simple_property _simple_property)
        {
            //throw new Exception("The method or operation is not implemented.");
            _simple_property.property_type.visit(this);
            if (returned_scope == null)
                return;
            ElementScope es = new ElementScope(new SymInfo(_simple_property.property_name.name, SymbolKind.Property, _simple_property.property_name.name),
                                                                                   returned_scope, cur_scope);
            es.declaringUnit = entry_scope;
            if (_simple_property.array_default != null)
            {
                TypeScope ts = cur_scope as TypeScope;
                if (_simple_property.parameter_list != null)
                {
                    ts.elementType = returned_scope as TypeScope;
                    for (int i = 0; i < _simple_property.parameter_list.parameters.Count; i++)
                    {
                        _simple_property.parameter_list.parameters[i].type.visit(this);
                        if (returned_scope == null || !(returned_scope is TypeScope)) return;
                        for (int j = 0; j < _simple_property.parameter_list.parameters[i].names.idents.Count; j++)
                            ts.AddIndexer(returned_scope as TypeScope, _simple_property.attr == definition_attribute.Static);
                    }

                }
            }
            if (_simple_property.parameter_list != null)
            {
                es.elementType = returned_scope as TypeScope;
                ProcScope ps = new ProcScope("#getset" + _simple_property.property_name.name, cur_scope);
                ps.procRealization = new ProcRealization(ps, ps.topScope);
                ps.already_defined = true;
                cur_scope.AddName("#getset" + _simple_property.property_name.name, ps);
                for (int i = 0; i < _simple_property.parameter_list.parameters.Count; i++)
                {
                    _simple_property.parameter_list.parameters[i].type.visit(this);
                    if (returned_scope == null || !(returned_scope is TypeScope))
                        return;

                    for (int j = 0; j < _simple_property.parameter_list.parameters[i].names.idents.Count; j++)
                    {
                        
                        ps.loc = get_location(_simple_property);
                        ps.si.not_include = true;
                        
                        string param_name = _simple_property.parameter_list.parameters[i].names.idents[j].name;
                        ps.AddName(param_name, new ElementScope(new SymInfo(param_name, SymbolKind.Parameter, null),returned_scope, ps));
                        
                        es.AddIndexer(returned_scope as TypeScope);
                    } 
                }
                es.MakeDescription();
            }
            es.loc = get_location(_simple_property);
            if (add_doc_from_text && this.converter.controller.docs != null && this.converter.controller.docs.ContainsKey(_simple_property))
                es.AddDocumentation(this.converter.controller.docs[_simple_property]);
            if (_simple_property.attr == definition_attribute.Static)
                es.is_static = true;
            es.acc_mod = cur_access_mod;
            es.si.acc_mod = cur_access_mod;
            if (_simple_property.accessors != null && _simple_property.accessors.write_accessor == null)
            {
                es.is_readonly = true;
                es.MakeDescription();
            }
                
            cur_scope.AddName(_simple_property.property_name.name, es);
            //if (_simple_property.accessors != null && _simple_property.accessors.write_accessor != null && _simple_property.accessors.write_accessor.pr != null)
            //    _simple_property.accessors.write_accessor.pr.visit(this);
        }

        public override void visit(index_property _index_property)
        {
            //throw new Exception("The method or operation is not implemented.");
            if (_index_property.is_default != null)
            {
                TypeScope ts = cur_scope as TypeScope;
                if (_index_property.parameter_list != null)
                {
                    for (int i = 0; i < _index_property.parameter_list.parameters.Count; i++)
                    {
                        _index_property.parameter_list.parameters[i].type.visit(this);
                        if (returned_scope == null || !(returned_scope is TypeScope))
                            return;
                        for (int j = 0; j < _index_property.parameter_list.parameters[i].names.idents.Count; j++)
                            ts.AddIndexer(returned_scope as TypeScope, _index_property.attr == definition_attribute.Static);
                    }

                }
            }
        }

        public override void visit(class_members _class_members)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(access_modifer_node _access_modifer_node)
        {
            //throw new Exception("The method or operation is not implemented.");
        }
		
        private access_modifer cur_access_mod = access_modifer.none;
        private bool parse_only_method_header = false;
        private bool parse_only_method_body = false;
        private bool parse_only_class_headers = false;
        private bool parse_only_method_headers = false;
        private bool parse_only_method_bodies = false;
        private Dictionary<declaration, SymScope> class_members = new Dictionary<declaration, SymScope>();

        public override void visit(class_body_list _class_body)
        {
            Dictionary<declaration, SymScope> scopes = new Dictionary<declaration, SymScope>();
            if (!parse_only_method_bodies)
            {
                parse_only_method_header = true;
                
                foreach (class_members mems in _class_body.class_def_blocks)
                {
                    if (mems.access_mod != null)
                        cur_access_mod = mems.access_mod.access_level;

                    foreach (declaration decl in mems.members)
                    {
                        try
                        {
                            decl.visit(this);
                            scopes.Add(decl, returned_scope);
                            if (parse_only_method_headers)
                                class_members.Add(decl, returned_scope);
                        }
                        catch (Exception e)
                        {

                        }
                    }

                    cur_access_mod = access_modifer.none;
                }
            }
            parse_only_method_header = false;
            parse_only_method_body = true;
            if (!parse_only_method_headers)
            {
                
                foreach (class_members mems in _class_body.class_def_blocks)
                {
                    if (mems.access_mod != null)
                        cur_access_mod = mems.access_mod.access_level;
                    foreach (declaration decl in mems.members)
                    {
                        try
                        {
                            if (decl is procedure_definition)
                            {
                                if (parse_only_method_bodies)
                                    cur_scope = class_members[decl];
                                else
                                    cur_scope = scopes[decl];
                                decl.visit(this);
                            }

                        }
                        catch (Exception e)
                        {

                        }
                    }
                    cur_access_mod = access_modifer.none;
                }
            }
            parse_only_method_body = false;
        }
		
        private bool has_cyclic_inheritance(TypeScope ts)
        {
        	TypeScope tmp = ts.baseScope;
        	while (tmp != null)
        		if (tmp == ts) 
        		return true;
        		else tmp = tmp.baseScope;
        	return false;
        }

        public override void visit(class_definition _class_definition)
        {
            //throw new Exception("The method or operation is not implemented.");
            SymScope tmp = cur_scope;
            TypeScope ss = null;
            returned_scope = null;
            if (_class_definition.class_parents != null && _class_definition.class_parents.types.Count > 0)
                _class_definition.class_parents.types[0].visit(this);
            if (returned_scope is TypeScope && has_cyclic_inheritance(returned_scope as TypeScope))
                returned_scope = null;
            if (cur_type_name != null)
            {
                ss = cur_scope.FindNameOnlyInType(cur_type_name) as TypeScope;
                if (parse_only_class_headers && ss != null)
                {
                    ss.Clear();
                    //ss.declaringUnit.members.Remove(ss);
                    ss.declaringUnit = cur_scope;
                    ss.topScope = cur_scope;
                    cur_scope.members.Add(ss);
                }
                    
            }
                
            if (ss == null || !(ss.members != null && ss.members.Count == 0) && !parse_only_class_headers && !parse_only_method_bodies)
            {
                if (_class_definition.keyword == class_keyword.Record)
                {
                    ss = new TypeScope(SymbolKind.Struct, cur_scope, returned_scope);
                    if (cur_type_name == null)
                        cur_type_name = "$record";
                }
                else if (_class_definition.keyword == class_keyword.Class)
                {
                    ss = new TypeScope(SymbolKind.Class, cur_scope, returned_scope);
                    if ((_class_definition.attribute & class_attribute.Sealed) == class_attribute.Sealed)
                        ss.is_final = true;
                    if ((_class_definition.attribute & class_attribute.Abstract) == class_attribute.Abstract)
                        ss.is_abstract = true;
                    if (cur_type_name == null)
                        cur_type_name = "$class";
                }
                else if (_class_definition.keyword == class_keyword.Interface || _class_definition.keyword == class_keyword.TemplateInterface)
                {
                    ss = new TypeScope(SymbolKind.Interface, cur_scope, returned_scope);
                    if (cur_type_name == null) cur_type_name = "$interface";
                }
                else if (_class_definition.keyword == class_keyword.TemplateClass)
                {
                    ss = new TypeScope(SymbolKind.Class, cur_scope, returned_scope);
                    if (cur_type_name == null) cur_type_name = "$class";
                }
                else if (_class_definition.keyword == class_keyword.TemplateRecord)
                {
                    ss = new TypeScope(SymbolKind.Struct, cur_scope, returned_scope);
                    if (cur_type_name == null) cur_type_name = "$record";
                }
                if (ss != null)
                {
                    if (template_args != null && template_args.Count > 0)
                        cur_scope.AddName(cur_type_name+"`"+ template_args.Count, ss);
                    else
                        cur_scope.AddName(cur_type_name, ss);
                }
                    
            }
            else
            {
                ss.baseScope = returned_scope as TypeScope;
                if ((_class_definition.attribute & class_attribute.Sealed) == class_attribute.Sealed)
                    ss.is_final = true;
                if ((_class_definition.attribute & class_attribute.Abstract) == class_attribute.Abstract)
                    ss.is_abstract = true;
                if (ss.baseScope == null)
                    ss.baseScope = TypeTable.obj_type;
            }
            if ((_class_definition.attribute & class_attribute.Static) == class_attribute.Static)
            {
                ss.is_static = true;
                ss.si.is_static = true;
            }
                
            int num = 0;
            if (_class_definition.keyword != class_keyword.Interface)
                num = 1;
            else
                ss.baseScope = null;
            if (parse_only_class_headers)
            {
                returned_scope = ss;
                return;
            }
                
            if (_class_definition.class_parents != null && _class_definition.class_parents.types.Count > num)
            {
                for (int i = num; i < _class_definition.class_parents.types.Count; i++)
                {
                    _class_definition.class_parents.types[i].visit(this);
                    if (returned_scope != null && returned_scope is TypeScope && has_cyclic_inheritance(returned_scope as TypeScope))
                        returned_scope = null;
                    if (returned_scope != null && returned_scope is TypeScope && (returned_scope as TypeScope).si.kind == SymbolKind.Interface)
                        ss.AddImplementedInterface(returned_scope as TypeScope);
                }
            }
            if (has_cyclic_inheritance(ss))
                ss.baseScope = null;
            if (ss.loc != null)
                ss.predef_loc = ss.loc;
            ss.loc = get_location(_class_definition);
            cur_scope = ss;
            
            if (!parse_only_method_bodies)
            {
                if (_class_definition.template_args != null)
                {
                    foreach (ident id in _class_definition.template_args.idents)
                        ss.AddGenericParameter(id.name, get_location(id));
                }
                else if (template_args != null)
                {
                    foreach (ident id in template_args.idents)
                        ss.AddGenericParameter(id.name, get_location(id));
                }
            }
            
            string tmp_name = cur_type_name;
            cur_type_name = null;
            if (_class_definition.body != null)
            {
                _class_definition.body.visit(this);
                ss.body_loc = get_location(_class_definition);
                ss.real_body_loc = get_location(_class_definition.body);
                ss.AddDefaultConstructorIfNeed();
                if (((_class_definition.attribute & PascalABCCompiler.SyntaxTree.class_attribute.Auto) == class_attribute.Auto))
                {
                    ProcScope ps = new ProcScope(StringConstants.default_constructor_name, ss, true);
                    foreach (class_members members in _class_definition.body.class_def_blocks)
                    {
                        foreach (declaration decl in members.members)
                        {
                            var_def_statement vds = decl as var_def_statement;
                            if (vds == null)
                                continue;
                            if (vds.vars_type != null)
                                vds.vars_type.visit(this);
                            else
                                vds.inital_value.visit(this);
                            foreach (ident id in vds.vars.list)
                            {
                                ps.parameters.Add(new ElementScope(new SymInfo(id.name, SymbolKind.Parameter, id.name), returned_scope, ps));
                            }
                        }
                    }
                    ps.return_type = ss;
                    ps.Complete();
                    ss.AddName(StringConstants.default_constructor_name, ps);
                }
            }
            mark_as_possible_abstract(ss);
            cur_type_name = tmp_name;
            returned_scope = ss;
            cur_scope = tmp;
        }

        private void mark_as_possible_abstract(TypeScope ts)
        {
            if (ts.is_abstract)
                return;
            if (ts.baseScope == null || !ts.baseScope.is_abstract)
                return;
            List<ProcScope> meths = ts.baseScope.GetAbstractMethods();
            foreach (ProcScope abstr_meth in meths)
            {
                bool has_override = false;
                foreach (ProcScope meth in ts.GetMethods())
                {
                    if (meth.name == abstr_meth.name && meth.IsParamsEquals(abstr_meth))
                    {
                        has_override = true;
                        break;
                    }
                }
                if (!has_override)
                {
                    ts.is_abstract = true;
                    break;
                }
                    
            }
        }

        public override void visit(default_indexer_property_node _default_indexer_property_node)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(known_type_definition _known_type_definition)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(set_type_definition _set_type_definition)
        {
            //throw new Exception("The method or operation is not implemented.");
            _set_type_definition.of_type.visit(this);
            TypeScope ts = returned_scope as TypeScope;
            if (returned_scope is ProcScope)
                ts = new ProcType(returned_scope as ProcScope);
            returned_scope = new SetScope(ts);
            returned_scope.topScope = cur_scope;
        }

        public override void visit(record_const_definition _record_const_definition)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(record_const _record_const)
        {
           // throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(record_type _record_type)
        {
            //throw new Exception("The method or operation is not implemented.");
            SymScope tmp = cur_scope;
            RecordScope rs = new RecordScope();
            rs.loc = get_location(_record_type);
            cur_scope.AddName("$record",rs);
            cur_scope = rs;
            if (_record_type.parts.fixed_part != null)
            	foreach (var_def_statement vds in _record_type.parts.fixed_part.vars)
            {
            	vds.visit(this);
            }
            returned_scope = cur_scope;
            cur_scope = tmp;
        }

        public override void visit(enum_type_definition _enum_type_definition)
        {
            bool is_tuple = false;
            template_type_reference tuple = new template_type_reference();
            tuple.name = new named_type_reference(new ident_list(new ident("System"), new ident("Tuple")).idents);
            template_param_list tpl = new template_param_list();
            tuple.params_list = tpl;
            if (_enum_type_definition.enumerators != null)
                foreach (enumerator en in _enum_type_definition.enumerators.enumerators)
                {
                    if (!(en.name is named_type_reference))
                    {
                        is_tuple = true;
                    }
                    else
                    {
                        named_type_reference ntr = en.name as named_type_reference;
                        if (ntr.names.Count > 1 || ntr.names.Count == 0)
                        {
                            is_tuple = true;
                        }
                        else
                        {
                            SymScope ss = cur_scope.FindName(ntr.FirstIdent.name);
                            if (ss != null && ss is TypeScope)
                            {
                                is_tuple = true;
                            }
                        }
                    }
                    tpl.Add(en.name);
                }
            if (is_tuple)
            {
                tuple.visit(this);
                return;
            }
            //throw new Exception("The method or operation is not implemented.");
            EnumScope enum_scope = new EnumScope(SymbolKind.Enum, cur_scope,
                                         TypeTable.get_compiled_type(new SymInfo(typeof(Enum).Name, SymbolKind.Enum, typeof(Enum).FullName), typeof(Enum)));
            enum_scope.loc = get_location(_enum_type_definition);
            enum_scope.topScope = cur_scope;
            List<ElementScope> elems = new List<ElementScope>();
            if (_enum_type_definition.enumerators != null)
                foreach (enumerator en in _enum_type_definition.enumerators.enumerators)
                {
                    var name = (en.name as named_type_reference).FirstIdent.name;
                    ElementScope ss = new ElementScope(new SymInfo(name, SymbolKind.Constant, name),/*cur_scope.FindName(StringConstants.integer_type_name)*/enum_scope, cur_scope);
                    ss.is_static = true;
                    ss.cnst_val = name;
                    elems.Add(ss);
                    ss.loc = get_location(en);
                    cur_scope.AddName(name, ss);
                    enum_scope.AddName(name, ss);
                    enum_scope.AddEnumConstant(name);
                    if (this.converter.controller.docs.ContainsKey(en))
                        ss.AddDocumentation(this.converter.controller.docs[en]);
                }
            for (int i = 0; i < elems.Count; i++)
                elems[i].MakeDescription();
            returned_scope = enum_scope;
        }

        public override void visit(char_const _char_const)
        {
            returned_scope = TypeTable.char_type;//entry_scope.FindName(StringConstants.char_type_name);
            if (in_kav)
            	cnst_val.prim_val = this.converter.controller.Parser.LanguageInformation.GetStringForChar(_char_const.cconst);
            //cnst_val.prim_val = "'"+_char_const.cconst.ToString()+"'";
            else cnst_val.prim_val = _char_const.cconst;
        }

        public override void visit(raise_statement _raise_statement)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(sharp_char_const _sharp_char_const)
        {
            returned_scope = TypeTable.char_type;//entry_scope.FindName(StringConstants.char_type_name);
            cnst_val.prim_val = this.converter.controller.Parser.LanguageInformation.GetStringForSharpChar(_sharp_char_const.char_num);
        }
		
        private bool in_kav=true;
        public override void visit(literal_const_line _literal_const_line)
        {
            //entry_scope.FindName(StringConstants.string_type_name);
            StringBuilder sb = new StringBuilder();
            in_kav = false;
            for (int i = 0; i < _literal_const_line.literals.Count; i++)
            {
                _literal_const_line.literals[i].visit(this);
                if (cnst_val.prim_val != null && cnst_val.prim_val is char)
                    sb.Append((char)cnst_val.prim_val);
                else if (cnst_val.prim_val != null && cnst_val.prim_val is string)
                    sb.Append((string)cnst_val.prim_val);
            }
            in_kav = true;
            returned_scope = TypeTable.string_type;
            cnst_val.prim_val = sb.ToString();
        }

        public override void visit(string_num_definition _string_num_definition)
        {
            //throw new Exception("The method or operation is not implemented.");
            try
            {
            	_string_num_definition.num_of_symbols.visit(this);
            }
            catch(Exception e)
            {
            	
            }
            returned_scope = new ShortStringScope(TypeTable.string_type,cnst_val.prim_val);//entry_scope.FindName(StringConstants.string_type_name);
            returned_scope.topScope = cur_scope;
            returned_scope.loc = get_location(_string_num_definition);
        }

        public override void visit(variant _variant)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(variant_list _variant_list)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(variant_type _variant_type)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(variant_types _variant_types)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(variant_record_type _variant_record_type)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(procedure_call _procedure_call)
        {
            //throw new Exception("The method or operation is not implemented.");
            if (has_lambdas(_procedure_call.func_name))
            {
                _procedure_call.func_name.visit(this);
            }
        }

        public override void visit(class_predefinition _class_predefinition)
        {
            //throw new Exception("The method or operation is not implemented.");
           
        }

        public override void visit(nil_const _nil_const)
        {
        	returned_scope = new NullTypeScope();
        }

        public override void visit(file_type_definition _file_type_definition)
        {
            //throw new Exception("The method or operation is not implemented.");
            if (_file_type_definition.elem_type != null)
            _file_type_definition.elem_type.visit(this);
            returned_scope = new FileScope(returned_scope as TypeScope, cur_scope);
        }

        public override void visit(constructor _constructor)
        {
            SymScope topScope = cur_scope;
            ProcScope ps = null;
            location loc = get_location(_constructor);
            bool is_realization = false;
            if (_constructor.name != null)
            {
                _constructor.name.visit(this);
                if (_constructor.name.class_name != null)
                {
                    topScope = cur_scope.FindName(_constructor.name.class_name.name);
                    if (topScope != null)
                    {
                        ps = topScope.FindNameOnlyInThisType(meth_name) as ProcScope;
                        if (ps == null)
                        {
                            ps = new ProcScope(StringConstants.default_constructor_name, cur_scope, true);
                            ps.head_loc = loc;
                        }
                        else
                            ps = select_function_definition(ps, _constructor.parameters, topScope as TypeScope, topScope as TypeScope, false, _constructor.class_keyword);
                        //while (ps != null && ps.already_defined) ps = ps.nextProc;
                        if (ps == null)
                        {
                            ps = new ProcScope(meth_name, cur_scope);
                            ps.head_loc = loc;
                        }
                        if (ps.parameters.Count != 0 && _constructor.parameters != null)
                        {
                            ps.parameters.Clear();
                            ps.already_defined = true;
                        }
                        if (impl_scope == null)
                        {
                            ProcRealization pr = new ProcRealization(ps, cur_scope);
                            pr.already_defined = true;
                            ps.procRealization = pr;
                            pr.loc = cur_loc;
                            pr.head_loc = loc;
                            is_realization = true;
                            entry_scope.AddName("$method", pr);
                        }
                        else
                        {
                            ProcRealization pr = new ProcRealization(ps, impl_scope);
                            pr.already_defined = true;
                            ps.procRealization = pr;
                            pr.loc = cur_loc;
                            pr.head_loc = loc;
                            is_realization = true;
                            impl_scope.AddName("$method", pr);
                        }
                    }
                    else
                    {
                        ps = new ProcScope(StringConstants.default_constructor_name, cur_scope, true);
                        ps.head_loc = loc;
                    }
                }
                else
                {
                    ps = new ProcScope(StringConstants.default_constructor_name, cur_scope, true);
                    ps.head_loc = loc;
                    SymScope ss = cur_scope.FindNameOnlyInThisType(StringConstants.default_constructor_name);
                    if (ss != null && ss is ProcScope)
                    {
                        if (ps.topScope == ss.topScope)
                        {
                            while ((ss as ProcScope).nextProc != null) ss = (ss as ProcScope).nextProc;
                            (ss as ProcScope).nextProc = ps;
                        }
                        else
                            ps.nextProc = ss as ProcScope;
                        cur_scope.AddName("$method", ps);
                        ps.si.name = StringConstants.default_constructor_name;
                    }
                    else
                    {
                        cur_scope.AddName(meth_name, ps);
                    }
                    ps.return_type = cur_scope as TypeScope;
                }
            }
            else
            {
                ps = new ProcScope(StringConstants.default_constructor_name, cur_scope, true);
                ps.head_loc = loc;
                SymScope ss = cur_scope.FindNameOnlyInType(StringConstants.default_constructor_name);
                if (ss != null && ss is ProcScope)
                {
                    while ((ss as ProcScope).nextProc != null) ss = (ss as ProcScope).nextProc;
                    (ss as ProcScope).nextProc = ps;
                    cur_scope.AddName("$method", ps);
                    ps.si.name = StringConstants.default_constructor_name;
                }
                else
                {
                    cur_scope.AddName(StringConstants.default_constructor_name, ps);
                }
                ps.return_type = cur_scope as TypeScope;
            }
            if (!is_realization && ps.loc == null)
            {
                ps.loc = cur_loc;
            }
            //ps.head_loc = loc;
            ps.declaringUnit = entry_scope;
            ps.is_static = _constructor.class_keyword;
            SetAttributes(ps, _constructor.proc_attributes);
            if (add_doc_from_text && this.converter.controller.docs != null && this.converter.controller.docs.ContainsKey(_constructor))
                ps.AddDocumentation(this.converter.controller.docs[_constructor]);
            if (is_proc_realization) ps.already_defined = true;
            else ps.loc = loc;
            if (_constructor.name == null || _constructor.name.class_name == null)
            {
                ps.acc_mod = cur_access_mod;
                ps.si.acc_mod = cur_access_mod;
            }
            if (_constructor.parameters != null)
                foreach (typed_parameters pars in _constructor.parameters.params_list)
                {
                    pars.vars_type.visit(this);
                    if (returned_scope != null)
                    {
                        if (returned_scope is ProcScope)
                            returned_scope = new ProcType(returned_scope as ProcScope);
                        foreach (ident id in pars.idents.idents)
                        {
                            ElementScope si = new ElementScope(new SymInfo(id.name, SymbolKind.Parameter, id.name), returned_scope, ps);
                            si.loc = get_location(id);
                            ps.AddName(id.name, si);
                            if (pars.inital_value != null)
                            {
                                pars.inital_value.visit(this);
                                if (returned_scope is NullTypeScope)
                                    si.cnst_val = "nil";
                                else
                                    si.cnst_val = cnst_val.prim_val;
                            }
                            si.param_kind = pars.param_kind;
                            si.MakeDescription();
                            ps.AddParameter(si);
                        }
                    }
                }
            if (cur_scope is TypeScope && !ps.is_static)
                ps.AddName("self", new ElementScope(new SymInfo("self", SymbolKind.Parameter, "self"), cur_scope, ps));

            //cur_scope = ps;
            returned_scope = ps;
            ps.Complete();
        }

        public override void visit(destructor _destructor)
        {
            //throw new Exception("The method or operation is not implemented.");
            SymScope topScope = cur_scope;
            ProcScope ps = null;
            location loc = get_location(_destructor);
            bool is_realization = false;
            _destructor.name.visit(this);
            if (_destructor.name.class_name != null)
            {
                topScope = cur_scope.FindName(_destructor.name.class_name.name);
                if (topScope != null)
                {
                    ps = topScope.FindNameOnlyInThisType(meth_name) as ProcScope;
                    if (ps == null)
                    {
                        ps = new ProcScope(meth_name, cur_scope);
                        ps.head_loc = loc;
                    }
                    else ps = select_function_definition(ps, _destructor.parameters, null, topScope as TypeScope);
                    //while (ps != null && ps.already_defined) ps = ps.nextProc;
                    if (ps == null)
                    {
                        ps = new ProcScope(meth_name, cur_scope);
                        ps.head_loc = loc;
                    }
                    if (ps.parameters.Count != 0 && _destructor.parameters != null)
                    {
                        ps.parameters.Clear();
                        ps.already_defined = true;
                    }
                    if (impl_scope == null)
                    {
                        ProcRealization pr = new ProcRealization(ps, cur_scope);
                        pr.already_defined = true;
                        pr.loc = cur_loc;
                        pr.head_loc = loc;
                        is_realization = true;
                        entry_scope.AddName("$method", pr);

                    }
                    else
                    {
                        ProcRealization pr = new ProcRealization(ps, impl_scope);
                        pr.already_defined = true;
                        pr.loc = cur_loc;
                        pr.head_loc = loc;
                        is_realization = true;
                        impl_scope.AddName("$method", pr);
                    }
                }
                else
                {
                    ps = new ProcScope(meth_name, cur_scope);
                    ps.head_loc = loc;
                }
            }
            else
            {
                ps = new ProcScope(meth_name, cur_scope);
                ps.head_loc = loc;
                SymScope ss = cur_scope.FindNameOnlyInThisType(meth_name);
                if (ss != null && ss is ProcScope)
                {
                    while ((ss as ProcScope).nextProc != null) ss = (ss as ProcScope).nextProc;
                    (ss as ProcScope).nextProc = ps;
                    cur_scope.AddName("$method", ps);
                    ps.si.name = meth_name;
                }
                else
                {
                    cur_scope.AddName(meth_name, ps);
                }
            }
            if (!is_realization && ps.loc == null)
                ps.loc = cur_loc;
            //ps.head_loc = loc;
            ps.declaringUnit = entry_scope;
            SetAttributes(ps, _destructor.proc_attributes);
            if (add_doc_from_text && this.converter.controller.docs != null && this.converter.controller.docs.ContainsKey(_destructor))
                ps.AddDocumentation(this.converter.controller.docs[_destructor]);
            if (is_proc_realization) ps.already_defined = true;
            else ps.loc = loc;
            if (_destructor.name == null || _destructor.name.class_name == null)
            {
                ps.acc_mod = cur_access_mod;
                ps.si.acc_mod = cur_access_mod;
            }
            if (_destructor.parameters != null)
                foreach (typed_parameters pars in _destructor.parameters.params_list)
                {
                    pars.vars_type.visit(this);
                    if (returned_scope != null)
                    {
                        if (returned_scope is ProcScope)
                            returned_scope = new ProcType(returned_scope as ProcScope);
                        foreach (ident id in pars.idents.idents)
                        {
                            ElementScope si = new ElementScope(new SymInfo(id.name, SymbolKind.Parameter, id.name), returned_scope, ps);
                            si.loc = get_location(id);
                            ps.AddName(id.name, si);
                            si.param_kind = pars.param_kind;
                            si.MakeDescription();
                            ps.AddParameter(si);
                        }
                    }
                }
            if (cur_scope is TypeScope)
                ps.AddName("self", new ElementScope(new SymInfo("self", SymbolKind.Parameter, "self"), cur_scope, ps));
            //cur_scope = ps;
            returned_scope = ps;
            ps.Complete();
        }

        public override void visit(inherited_method_call _inherited_method_call)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(typecast_node _typecast_node)
        {
            if (_typecast_node.cast_op == op_typecast.is_op)
            {
                returned_scope = TypeTable.bool_type;
            }
            else
                _typecast_node.type_def.visit(this);
        }

        public override void visit(interface_node _interface_node)
        {
            

            if (_interface_node.interface_definitions != null)
                foreach (declaration decl in _interface_node.interface_definitions.defs)
                {
                    try
                    {
                        decl.visit(this);
                    }
                    catch (Exception e)
                    {
#if DEBUG
                        File.AppendAllText("log.txt", e.Message + Environment.NewLine + e.StackTrace + Environment.NewLine);
#endif
                    }
                }

        }

        public override void visit(implementation_node _implementation_node)
        {
            var currentLanguage = Languages.Facade.LanguageProvider.Instance.SelectLanguageByExtension(this.cur_unit_file_name);

            SymScope tmp = cur_scope;
            unl.Clear();
            cur_scope = new ImplementationUnitScope(new SymInfo("$implementation", SymbolKind.Namespace, "implementation"), cur_scope);
            tmp.AddName("$implementation", cur_scope);
            (tmp as InterfaceUnitScope).impl_scope = cur_scope as ImplementationUnitScope;
            cur_scope.loc = get_location(_implementation_node);
            if (_implementation_node.uses_modules != null)
            {
                (cur_scope as ImplementationUnitScope).uses_source_range = get_location(_implementation_node.uses_modules);
                for (int j = _implementation_node.uses_modules.units.Count - 1; j >= 0; j--)
                {
                    unit_or_namespace s = _implementation_node.uses_modules.units[j];
                    CompileUsedUnitOrNamespace(s, Path.GetDirectoryName(this.cur_unit_file_name),
                        cur_scope, ns_cache, unl, currentLanguage.CaseSensitive);
                }
            }
            impl_scope = cur_scope;
            if (_implementation_node.implementation_definitions != null)
                foreach (declaration decl in _implementation_node.implementation_definitions.defs)
                {
                    try
                    {
                        if (parse_only_interface && !need_to_parse(decl))
                            continue;
                        decl.visit(this);
                    }
                    catch (Exception e)
                    {
#if DEBUG
                        File.AppendAllText("log.txt", e.Message + Environment.NewLine + e.StackTrace + Environment.NewLine);
#endif
                        cur_scope = impl_scope;
                    }
                }
        }

        private bool need_to_parse(declaration _declaration)
        {
            if (!(_declaration is procedure_definition))
                return false;
            procedure_definition proc = _declaration as procedure_definition;
            if (proc.proc_header.name.class_name != null)
                return true;
            if (proc.proc_header.proc_attributes == null)
                return false;
            if (has_extensionmethod_attr(proc.proc_header.proc_attributes.proc_attributes))
                return true;
            return false;
        }

        public override void visit(diap_expr _diap_expr)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(block _block)
        {
            //throw new Exception("The method or operation is not implemented.");
            if (_block.defs != null)
                _block.defs.visit(this);
            if (_block.program_code != null)
                _block.program_code.visit(this);
            //cur_scope.loc = get_location(_block.program_code);
        }

        public override void visit(proc_block _proc_block)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(array_of_named_type_definition _array_of_named_type_definition)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(array_of_const_type_definition _array_of_const_type_definition)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(literal _literal)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(case_variants _case_variants)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(diapason_expr _diapason_expr)
        {
            _diapason_expr.left.visit(this);
        }

        public override void visit(var_def_list_for_record _var_def_list)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(record_type_parts _record_type_parts)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(property_array_default _property_array_default)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(property_interface _property_interface)
        {
           // throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(property_parameter _property_parameter)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(property_parameter_list _property_parameter_list)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(inherited_ident _inherited_ident)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(format_expr _format_expr)
        {
            //throw new Exception("The method or operation is not implemented.");
            returned_scope = TypeTable.string_type;
        }

        public override void visit(initfinal_part _initfinal_part)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(token_info _token_info)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(raise_stmt _raise_stmt)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(op_type_node _op_type_node)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(file_type _file_type)
        {
        	 if (_file_type.file_of_type != null)
            _file_type.file_of_type.visit(this);
            returned_scope = new FileScope(returned_scope as TypeScope, cur_scope);
        }

        public override void visit(known_type_ident _known_type_ident)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(exception_handler _exception_handler)
        {
            SymScope tmp = cur_scope;
            SymScope stmt_scope = new BlockScope(cur_scope);
            cur_scope.AddName("$block_scope", stmt_scope);
            stmt_scope.loc = get_location(_exception_handler);
            if (_exception_handler.statements.source_context != null)
                stmt_scope.loc = new location(stmt_scope.loc.begin_line_num, stmt_scope.loc.begin_column_num,
                                              _exception_handler.statements.source_context.end_position.line_num,
                                              _exception_handler.statements.source_context.end_position.column_num, stmt_scope.loc.doc);
            returned_scope = null;
            if (_exception_handler.variable == null) return;
            if (_exception_handler.type_name != null)
                _exception_handler.type_name.visit(this);
            else returned_scope = cur_scope.FindName(_exception_handler.variable.name);
            if (returned_scope != null)
            {
                cur_scope = stmt_scope;
                ElementScope es = new ElementScope(new SymInfo(_exception_handler.variable.name, SymbolKind.Variable, _exception_handler.variable.name), returned_scope, cur_scope);
                es.loc = get_location(_exception_handler.variable);
                stmt_scope.AddName(_exception_handler.variable.name, es);
            }
            _exception_handler.statements.visit(this);
            cur_scope = tmp;
        }

        public override void visit(exception_ident _exception_ident)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(exception_handler_list _exception_handler_list)
        {
            foreach (exception_handler eh in _exception_handler_list.handlers)
				eh.visit(this);
        }

        public override void visit(exception_block _exception_block)
        {
            if (_exception_block.handlers != null)
                _exception_block.handlers.visit(this);
            if (_exception_block.stmt_list != null)
                _exception_block.stmt_list.visit(this);
            if (_exception_block.else_stmt_list != null)
                _exception_block.else_stmt_list.visit(this);
        }

        public override void visit(try_handler _try_handler)
        {
            
        }

        public override void visit(try_handler_finally _try_handler_finally)
        {
            _try_handler_finally.stmt_list.visit(this);
        }

        public override void visit(try_handler_except _try_handler_except)
        {
            _try_handler_except.except_block.visit(this);
        }

        public override void visit(try_stmt _try_stmt)
        {
            if (_try_stmt.stmt_list != null)
                _try_stmt.stmt_list.visit(this);
            if (_try_stmt.handler != null)
                _try_stmt.handler.visit(this);
        }

        public override void visit(inherited_message _inherited_message)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(external_directive _external_directive)
        {
            
        }

        public override void visit(using_list _using_list)
        {
            throw new Exception("The method or operation is not implemented.");
        }


        public override void visit(jump_stmt _jump_stmt)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(loop_stmt _loop_stmt)
        {
            SymScope tmp = cur_scope;
            SymScope stmt_scope = new BlockScope(cur_scope);
            cur_scope.AddName("$block_scope", stmt_scope);
            stmt_scope.loc = get_location(_loop_stmt);
            cur_scope = stmt_scope;
            if (_loop_stmt.stmt != null)
                _loop_stmt.stmt.visit(this);
            cur_scope = tmp;
        }

        public override void visit(foreach_stmt _foreach_stmt)
        {
            //throw new Exception("The method or operation is not implemented.");
            SymScope tmp = cur_scope;
            if (_foreach_stmt.type_name != null)
            {
                SymScope stmt_scope = new BlockScope(cur_scope);
                cur_scope.AddName("$block_scope", stmt_scope);
                stmt_scope.loc = get_location(_foreach_stmt);
                if (_foreach_stmt.type_name is no_type_foreach)
                {
                    cur_scope = stmt_scope;
                    _foreach_stmt.in_what.visit(this);
                    if (returned_scope != null)
                        returned_scope = returned_scope.GetElementType();
                    if (returned_scope == null)
                        returned_scope = TypeTable.obj_type;
                }
                else
                {
                    if (has_lambdas(_foreach_stmt.in_what))
                    {
                        cur_scope = stmt_scope;
                        _foreach_stmt.in_what.visit(this);
                    }
                    _foreach_stmt.type_name.visit(this);

                }
                if (returned_scope != null)
                {
                    cur_scope = stmt_scope;
                    if (returned_scope is ProcScope)
                        returned_scope = new ProcType(returned_scope as ProcScope);
                    ElementScope es = new ElementScope(new SymInfo(_foreach_stmt.identifier.name, SymbolKind.Variable, _foreach_stmt.identifier.name), returned_scope, cur_scope);
                    es.loc = get_location(_foreach_stmt.identifier);
                    stmt_scope.AddName(_foreach_stmt.identifier.name, es);
                }
            }
            if (_foreach_stmt.stmt != null)
                _foreach_stmt.stmt.visit(this);
            cur_scope = tmp;
        }

        public override void visit(addressed_value_funcname _addressed_value_funcname)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(named_type_reference_list _named_type_reference_list)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(template_param_list _template_param_list)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(template_type_reference _template_type_reference)
        {
            returned_scope = null;
            converted_template_type = _template_type_reference;
            _template_type_reference.name.visit(this);
            converted_template_type = null;
            List<TypeScope> gen_args = new List<TypeScope>();
            if (returned_scope != null && returned_scope is TypeScope)
            {
            	TypeScope ts = returned_scope as TypeScope;
            	
            	if (_template_type_reference.params_list != null)
            	{
            		List<TypeScope> instances = new List<TypeScope>();
            		foreach (type_definition td in _template_type_reference.params_list.params_list)
            		{
            			returned_scope = null;
            			td.visit(this);
                        if (returned_scope is TypeScope)
                            //instances.Add(ret_tn as TypeScope);
                            //ts.AddGenericInstanciation(ret_tn as TypeScope);
                            gen_args.Add(returned_scope as TypeScope);
                        else if (returned_scope is ProcScope)
                            gen_args.Add(new ProcType(returned_scope as ProcScope));
            		}
            		
            	}
            	if (gen_args.Count > 0)
            		ts = ts.GetInstance(gen_args, true);
            	//ts.MakeInstance();
            	//ret_tn = ts.GetGenericInstance(gen_args);
            	//ts.si.describe = ts.ToString();
            	//else
            	returned_scope = ts;
            }
        }

        public override void visit(int64_const _int64_const)
        {
            //throw new Exception("The method or operation is not implemented.");
            returned_scope = TypeTable.int64_type;//entry_scope.FindName(StringConstants.long_type_name);
        	cnst_val.prim_val = _int64_const.val;
        }

        public override void visit(uint64_const _uint64_const)
        {
            returned_scope = TypeTable.uint64_type;//entry_scope.FindName(StringConstants.ulong_type_name);
           cnst_val.prim_val = _uint64_const.val;
        }

        public override void visit(new_expr _new_expr)
        {
            _new_expr.type.visit(this);
            if (_new_expr.new_array && returned_scope != null && returned_scope is TypeScope)
            {
                List<TypeScope> indexes = new List<TypeScope>();
                indexes.Add(TypeTable.int_type);
                for (int i = 1; i < _new_expr.params_list.expressions.Count; i++)
                    indexes.Add(TypeTable.int_type);
                if (indexes.Count > 1)
                {
                    for (int i = 0; i < indexes.Count; i++)
                    {
                        indexes[i] = null;
                    }
                }
            	returned_scope = new ArrayScope(returned_scope as TypeScope, indexes.ToArray());
                if (indexes.Count == 1)
            	    (returned_scope as ArrayScope).is_dynamic_arr = true;
            }
            save_return_value();
            if (_new_expr.params_list != null)
            foreach (expression ex in _new_expr.params_list.expressions)
            {
                if (ex is function_lambda_definition)
                    ex.visit(this);
            }
            restore_return_value();
			/*if (ret_tn != null && ret_tn is TypeScope)
			{
				TypeScope ts = ret_tn as TypeScope;
				ret_tn = ts.GetConstructor();
			}*/
        }

        public override void visit(where_type_specificator_list _type_definition_list)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(where_definition _where_definition)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(where_definition_list _where_definition_list)
        {
            //throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(PascalABCCompiler.SyntaxTree.sizeof_operator _sizeof_operator)
        {
           returned_scope = TypeTable.int_type;
        }

        public override void visit(PascalABCCompiler.SyntaxTree.typeof_operator _typeof_operator)
        {
            //throw new Exception("The method or operation is not implemented.");
            returned_scope = TypeTable.get_compiled_type(new SymInfo(null, SymbolKind.Class,null),typeof(Type));
        }

        public override void visit(PascalABCCompiler.SyntaxTree.compiler_directive _compiler_directive)
        {
            //throw new Exception("The method or operation is not implemented.");
        }
		
        private string get_operator_sign(Operators op)
        {
        	switch(op)
        	{
        		case Operators.Plus : return StringConstants.plus_name;
        		case Operators.Minus : return StringConstants.minus_name;
        		case Operators.Division : return StringConstants.div_name;
                case Operators.IntegerDivision: return StringConstants.div_name;
                case Operators.Multiplication : return StringConstants.mul_name;
        		case Operators.ModulusRemainder : return StringConstants.mod_name;
        		case Operators.Less : return StringConstants.sm_name;
        		case Operators.LessEqual : return StringConstants.smeq_name;
        		case Operators.Greater : return StringConstants.gr_name;
        		case Operators.GreaterEqual : return StringConstants.greq_name;
        		case Operators.Equal : return StringConstants.eq_name;
        		case Operators.NotEqual : return StringConstants.noteq_name;
        		case Operators.AssignmentAddition : return StringConstants.plusassign_name;
        		case Operators.AssignmentMultiplication : return StringConstants.multassign_name;
        		case Operators.AssignmentSubtraction : return StringConstants.minusassign_name;
        		case Operators.AssignmentDivision : return StringConstants.divassign_name;
        		case Operators.Implicit : return "implicit";
        		case Operators.Explicit : return "explicit";
                case Operators.In: return StringConstants.in_name;
                case Operators.Power: return StringConstants.power_name;
                case Operators.LogicalOR: return StringConstants.or_name;
                case Operators.LogicalAND: return StringConstants.and_name;
                case Operators.BitwiseXOR: return StringConstants.xor_name;
                case Operators.LogicalNOT: return StringConstants.not_name;
            }
        	return "";
        }
        
        public override void visit(operator_name_ident _operator_name_ident)
        {
            //throw new Exception("The method or operation is not implemented.");
            string sign = get_operator_sign(_operator_name_ident.operator_type);
            if (sign.Length > 0 && char.IsLetter(sign[0]))
                sign = " " + sign;
            meth_name = "operator"+sign;
        }

        public override void visit(var_statement _var_statement)
        {
            //throw new Exception("The method or operation is not implemented.");
            _var_statement.var_def.visit(this);
            foreach (var_def_statement vds in pending_is_pattern_vars)
            {
                vds.visit(this);
            }
        }

        public override void visit(PascalABCCompiler.SyntaxTree.question_colon_expression _question_colon_expression)
        {
            _question_colon_expression.ret_if_true.visit(this);
            TypeScope type1 = returned_scope as TypeScope;
            _question_colon_expression.ret_if_false.visit(this);
            TypeScope type2 = returned_scope as TypeScope;
            if (type1 == null)
            {
                returned_scope = type2;
                return;
            }   
            if (type2 == null)
            {
                returned_scope = type1;
                return;
            }
                
            if (type1.IsConvertable(type2, true))
            {
                if (!(type2 is NullTypeScope))
                    returned_scope = type2;
                else
                    returned_scope = type1;
                return;
            }
            returned_scope = type1;
        }

        public override void visit(expression_as_statement _expression_as_statement)
        {
            //throw new Exception("The method or operation is not implemented.");
            if (has_lambdas(_expression_as_statement.expr) || _expression_as_statement.expr is unnamed_type_object)
                _expression_as_statement.expr.visit(this);
        }

        public override void visit(declarations_as_statement _declarations_as_statement)
        {
            foreach (declaration decl in _declarations_as_statement.defs.defs)
                decl.visit(this);
        }

        public override void visit(array_size _array_size)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(enumerator _enumerator)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(enumerator_list _enumerator_list)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(switch_stmt _switch_stmt)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(type_definition_attr_list _type_definition_attr_list)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(type_definition_attr _type_definition_attr)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public override void visit(lock_stmt _lock_stmt)
        {
        	if (_lock_stmt != null)
        	 _lock_stmt.stmt.visit(this);
        }
        

        public override void visit(documentation_comment_list node)
        {
            throw new NotImplementedException();
        }
        public override void visit(documentation_comment_section node)
        {
            throw new NotImplementedException();
        }
        public override void visit(documentation_comment_tag node)
        {
            throw new NotImplementedException();
        }
        public override void visit(documentation_comment_tag_param node)
        {
            throw new NotImplementedException();
        }
        public override void visit(ident_with_templateparams node)
        {
            bool tmp_search_all = search_all;
            node.name.visit(this);
            if ((tmp_search_all || returned_scope == null) && returned_scopes.Count > 0)
            {
                List<TypeScope> template_params = new List<TypeScope>();
                foreach (type_definition td in node.template_params.params_list)
                {
                    td.visit(this);
                    if (returned_scope is TypeScope)
                        template_params.Add(returned_scope as TypeScope);
                    else
                    {
                        return;
                    }
                }
                for (int i = 0; i < returned_scopes.Count; i++)
                {
                    ProcScope ps = returned_scopes[i] as ProcScope;
                    TypeScope ts = returned_scopes[i] as TypeScope;

                    if (ps != null)
                        returned_scopes[i] = ps.GetInstance(template_params);
                    else
                        returned_scopes[i] = ts.GetInstance(template_params, true);
                }
                
            }
            else if (returned_scope is ProcScope)
            {
                ProcScope ps = returned_scope as ProcScope;
                List<TypeScope> template_params = new List<TypeScope>();
                foreach (type_definition td in node.template_params.params_list)
                {
                    td.visit(this);
                    if (returned_scope is TypeScope)
                        template_params.Add(returned_scope as TypeScope);
                    else
                    {
                        returned_scope = ps;
                        return;
                    }
                }
                returned_scope = ps.GetInstance(template_params);
            }
            else if (returned_scope is TypeScope)
            {
                TypeScope ts = returned_scope as TypeScope;
                List<TypeScope> template_params = new List<TypeScope>();
                foreach (type_definition td in node.template_params.params_list)
                {
                    td.visit(this);
                    if (returned_scope is TypeScope)
                        template_params.Add(returned_scope as TypeScope);
                    else if (returned_scope is ProcScope)
                        template_params.Add(new ProcType(returned_scope as ProcScope));
                    else
                    {
                        returned_scope = ts;
                        return;
                    }
                }
                returned_scope = ts.GetInstance(template_params, true);
            }
        }
		public override void visit(bracket_expr _bracket_expr)
        {
        	_bracket_expr.expr.visit(this);
        }
		public override void visit(attribute _attribute)
        {
        	
        }
        
        public override void visit(attribute_list _attribute_list)
        {
        	
        }
        
        public override void visit(simple_attribute_list _simple_attribute_list)
        {
        	
        }
        public override void visit(function_lambda_definition _function_lambda_definition)
        {
            ProcScope ps = new ProcScope(_function_lambda_definition.lambda_name, this.cur_scope);
            ps.loc = get_location(_function_lambda_definition);
            ps.si.not_include = true;
            if (!disable_lambda_compilation)
                cur_scope.AddName(_function_lambda_definition.lambda_name, ps);
            if (_function_lambda_definition.ident_list != null)
                for (int i=0; i<_function_lambda_definition.ident_list.idents.Count; i++)
                {
                    ident id = _function_lambda_definition.ident_list.idents[i];
                    TypeScope param_type = new UnknownScope(new SymInfo("T", SymbolKind.Type, "T"));
                    if (awaitedProcType != null)
                    {
                        if (awaitedProcType is TypeSynonim)
                            awaitedProcType = (awaitedProcType as TypeSynonim).GetLeafActType();
                        if (awaitedProcType is ProcType)
                        {
                            if ((awaitedProcType as ProcType).target.parameters.Count > 0)
                                param_type = (awaitedProcType as ProcType).target.parameters[i].sc as TypeScope;
                        }
                        else if (awaitedProcType.IsDelegate && awaitedProcType.instances != null && awaitedProcType.instances.Count > 0)
                        {
                            param_type = awaitedProcType.instances[Math.Min(i, awaitedProcType.instances.Count - 1)];
                        }
                        else if (awaitedProcType.IsDelegate)
                        {
                            var invokeMeth = awaitedProcType.FindNameOnlyInType("Invoke") as ProcScope;
                            if (invokeMeth != null && invokeMeth.parameters != null && invokeMeth.parameters.Count > i)
                            {
                                param_type = invokeMeth.parameters[i].sc as TypeScope;
                            }
                        }
                    }
                    /*if (selected_methods != null)
                    {
                        foreach (ProcScope meth in selected_methods)
                        {
                            if (meth.parameters != null && meth.parameters.Count > 0 && (meth.parameters[1].sc as TypeScope).IsDelegate
                                && (meth.parameters[1].sc as TypeScope).IsGeneric)
                            {
                                
                            }
                        }
                    }*/
                    ElementScope es = new ElementScope(new SymInfo(id.name, SymbolKind.Parameter, ""), param_type, ps);
                    ps.AddName(id.name, es);
                    ps.AddParameter(es);
                    es.loc = get_location(id);
                }
            SymScope tmp = cur_scope;
            cur_scope = ps;
            TypeScope saved_return_type = ps.return_type;
            if (!disable_lambda_compilation)
            {
                string resultName = currentUnitLanguage.LanguageInformation.ResultVariableName;
                if (awaitedProcType != null)
                {
                    var invokeMeth = awaitedProcType.FindNameOnlyInType("Invoke") as ProcScope;
                    if (invokeMeth != null && invokeMeth.return_type != null && resultName != null)
                    {
                        
                        cur_scope.AddName(resultName, new ElementScope(new SymInfo(resultName,SymbolKind.Variable,resultName), invokeMeth.return_type, cur_scope));
                    }
                }
                statement_list sl = _function_lambda_definition.proc_body as statement_list;
                if (sl != null && sl.list.Count == 1 && sl.list[0] is assign && (sl.list[0] as assign).to is ident
                    && ((sl.list[0] as assign).to as ident).name.Equals(resultName, currentUnitLanguage.CaseSensitive ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase))
                {
                    (sl.list[0] as assign).from.visit(this);
                    ps.return_type = returned_scope as TypeScope;
                }
                else
                    _function_lambda_definition.proc_body.visit(this);
            }
                
            cur_scope = tmp;
            if (_function_lambda_definition.usedkeyword == 2)
                ps.return_type = null;
            else if (saved_return_type == ps.return_type)
                ps.return_type = new UnknownScope(new SymInfo("",SymbolKind.Class,""));// returned_scope as TypeScope;
            returned_scope = new ProcType(ps);
        }

        public override void visit(function_lambda_call _function_lambda_call)
        {
            //
        }
        public override void visit(semantic_check _semantic_check)
        {
        }
		
		public override void visit(lambda_inferred_type lit) //lroman//
        {
        }
        public override void visit(same_type_node stn) //SS 22/06/13//
        {
        }
        public override void visit(name_assign_expr _name_assign_expr) // SSM 27.06.13
        {
            returned_scope = null;
            if (_name_assign_expr.expr == null)
                _name_assign_expr.expr = new ident(_name_assign_expr.name.name);
            _name_assign_expr.expr.visit(this);
            if (returned_scope != null)
            {
                ElementScope es = new ElementScope(new SymInfo(_name_assign_expr.name.name, SymbolKind.Property, ""), returned_scope, cur_scope);
                cur_scope.AddName(_name_assign_expr.name.name, es);
            }
            else
            {
                ElementScope es = new ElementScope(new SymInfo(_name_assign_expr.name.name, SymbolKind.Property, ""), new UnknownScope(new SymInfo("",SymbolKind.Type,"")), cur_scope);
                cur_scope.AddName(_name_assign_expr.name.name, es);
            }
        }
        public override void visit(name_assign_expr_list _name_assign_expr_list) // SSM 27.06.13
        {
            foreach (name_assign_expr expr in _name_assign_expr_list.name_expr)
                expr.visit(this);
        }
        public override void visit(unnamed_type_object _unnamed_type_object) // SSM 27.06.13
        {
            SymScope tmp = cur_scope;
            TypeScope ts = null;
            cur_scope = ts = new TypeScope(SymbolKind.Class, cur_scope, null);
            tmp.AddName("class", cur_scope);
            ts.loc = get_location(_unnamed_type_object);
            ts.si = new SymInfo("class", SymbolKind.Class, "");
            if (_unnamed_type_object.ne_list != null)
                _unnamed_type_object.ne_list.visit(this);
            returned_scope = cur_scope;
            cur_scope = tmp;
        }
        public override void visit(semantic_type_node stn) // SSM 
        {
        }
        public override void visit(sequence_type _sequence_type)
        {
            template_type_reference ttr = new template_type_reference();
            List<ident> names = new List<ident>();
            names.Add(new ident("System"));
            names.Add(new ident("Collections"));
            names.Add(new ident("Generic"));
            names.Add(new ident("IEnumerable"));
            ttr.name = new named_type_reference(names);
            ttr.source_context = _sequence_type.source_context;
            ttr.params_list = new template_param_list();
            ttr.params_list.params_list.Add(_sequence_type.elements_type);
            visit(ttr);
        }
        public override void visit(assign_var_tuple _assign_var_tuple)
        {
            _assign_var_tuple.expr.visit(this);
            TypeScope ts = returned_scope as TypeScope;
            if (ts != null && ts.instances != null && ts.instances.Count > 0)
            {
                for (int i = 0; i < _assign_var_tuple.idents.idents.Count; i++)
                {
                    ident id = _assign_var_tuple.idents.idents[i];
                    if (id != null)
                    {
                        SymInfo si = new SymInfo(id.name, SymbolKind.Variable, id.name);

                        ElementScope es = new ElementScope(si, ts.instances[Math.Min(i, ts.instances.Count-1)], cur_scope);
                        es.acc_mod = cur_access_mod;
                        es.si.acc_mod = cur_access_mod;
                        es.loc = get_location(id);
                        cur_scope.AddName(id.name, es);
                        es.declaringUnit = cur_scope;
                    }
                }
            }
            
        }
        public override void visit(tuple_node _tuple_node)
        {
            method_call mc = new method_call();
            mc.parameters = _tuple_node.el;
            mc.dereferencing_value = new dot_node(new ident("Tuple"), new ident(StringConstants.default_constructor_name));
            mc.visit(this);
        }
		
		public override void visit(slice_expr _slice_expr)
		{
			_slice_expr.v.visit(this);
		}

        public override void visit(slice_expr_question _slice_expr_question)
        {
            _slice_expr_question.v.visit(this);
        }

        public override void visit(dot_question_node _dot_question_node)
        {
            dot_node dn = new dot_node(_dot_question_node.left, _dot_question_node.right, _dot_question_node.source_context);
            dn.visit(this);
        }

        public override void visit(modern_proc_type _modern_proc_type)
        {
            template_type_reference ttr = new template_type_reference();
            List<ident> names = new List<ident>();
            if (_modern_proc_type.res != null)
            {
                names.Add(new ident("System"));
                names.Add(new ident("Func"));
            }
            else
            {
                names.Add(new ident("System"));
                names.Add(new ident("Action"));
            }
            ttr.name = new named_type_reference(names);
            ttr.source_context = _modern_proc_type.source_context;
            ttr.params_list = new template_param_list();
            if (_modern_proc_type.aloneparam != null)
            {
                ttr.params_list.params_list.Add(_modern_proc_type.aloneparam);
                if (_modern_proc_type.res != null)
                    ttr.params_list.params_list.Add(_modern_proc_type.res);
            }
            else
            {
                if (_modern_proc_type.el != null)
                foreach (enumerator en in _modern_proc_type.el.enumerators)
                {
                    ttr.params_list.params_list.Add(en.name); // Здесь исправил SSM 15.1.16
                }
                if (_modern_proc_type.res != null)
                    ttr.params_list.params_list.Add(_modern_proc_type.res);
            }
            if (ttr.params_list.params_list.Count > 0)
                visit(ttr);
            else
                visit(ttr.name);
        }

        public override void visit(diapason_expr_new _diapason_expr_new)
        {
            method_call mc = new method_call();
            mc.parameters = new expression_list(new List<expression> { _diapason_expr_new.left, _diapason_expr_new.right });
            mc.dereferencing_value = new dot_node(new ident(StringConstants.pascalSystemUnitName), new ident("InternalRange"));
            mc.visit(this);
        }

        public override void visit(array_const_new acn)
        {
            TypeScope element_type = null;
            List<TypeScope> element_types = new List<TypeScope>();
            foreach (expression ex in acn.elements.expressions)
            {
                ex.visit(this);
                if (returned_scope != null && returned_scope is TypeScope)
                    element_types.Add(returned_scope as TypeScope);
            }

            element_type = element_types[0];
            for (int i = 1; i < element_types.Count; i++)
            {
                if (element_type.IsConvertable(element_types[i], true))
                    element_type = element_types[i];
                else if (!element_types[i].IsConvertable(element_type, true))
                {
                    element_type = TypeTable.obj_type;
                    break;
                }
            }

            returned_scope = new ArrayScope(element_type,null);

            cnst_val.prim_val = null;
        }

        public override void visit(bigint_const bi)
        {
            /*method_call mc = new method_call();
            mc.parameters = new expression_list(new uint64_const(bi.val, bi.source_context),bi.source_context);
            mc.dereferencing_value = new dot_node(new ident("System"), new ident("Numerics"), new ident("BigInteger"), new ident("Create"));
            mc.visit(this);*/
            var names = new List<ident> { new ident("System"), new ident("Numerics"), new ident("BigInteger") };
            var ntr = new named_type_reference(names, bi.source_context);
            var ne = new new_expr(ntr, new expression_list(new uint64_const(bi.val)), bi.source_context);
            ne.visit(this);
        }

        public override void visit(let_var_expr _let_var_expr)
        {
            var_def_statement vds = new var_def_statement(_let_var_expr.id, _let_var_expr.ex, _let_var_expr.source_context);
            vds.visit(this);
        }
    }
}