108 lines
2.5 KiB
C#
108 lines
2.5 KiB
C#
// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
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// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
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using System;
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namespace ICSharpCode.AvalonEdit.Utils
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{
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/// <summary>
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/// Represents a string with a segment.
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/// Similar to System.ArraySegment<T>, but for strings instead of arrays.
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/// </summary>
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public struct StringSegment : IEquatable<StringSegment>
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{
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readonly string text;
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readonly int offset;
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readonly int count;
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/// <summary>
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/// Creates a new StringSegment.
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/// </summary>
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public StringSegment(string text, int offset, int count)
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{
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if (text == null)
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throw new ArgumentNullException("text");
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if (offset < 0 || offset > text.Length)
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throw new ArgumentOutOfRangeException("offset");
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if (offset + count > text.Length)
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throw new ArgumentOutOfRangeException("count");
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this.text = text;
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this.offset = offset;
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this.count = count;
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}
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/// <summary>
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/// Creates a new StringSegment.
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/// </summary>
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public StringSegment(string text)
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{
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if (text == null)
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throw new ArgumentNullException("text");
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this.text = text;
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this.offset = 0;
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this.count = text.Length;
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}
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/// <summary>
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/// Gets the string used for this segment.
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/// </summary>
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public string Text {
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get { return text; }
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}
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/// <summary>
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/// Gets the start offset of the segment with the text.
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/// </summary>
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public int Offset {
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get { return offset; }
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}
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/// <summary>
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/// Gets the length of the segment.
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/// </summary>
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public int Count {
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get { return count; }
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}
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#region Equals and GetHashCode implementation
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/// <inheritdoc/>
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public override bool Equals(object obj)
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{
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if (obj is StringSegment)
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return Equals((StringSegment)obj); // use Equals method below
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else
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return false;
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}
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/// <inheritdoc/>
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public bool Equals(StringSegment other)
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{
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// add comparisions for all members here
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return object.ReferenceEquals(this.text, other.text) && offset == other.offset && count == other.count;
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}
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/// <inheritdoc/>
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public override int GetHashCode()
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{
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return text.GetHashCode() ^ offset ^ count;
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}
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/// <summary>
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/// Equality operator.
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/// </summary>
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public static bool operator ==(StringSegment left, StringSegment right)
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{
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return left.Equals(right);
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}
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/// <summary>
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/// Inequality operator.
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/// </summary>
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public static bool operator !=(StringSegment left, StringSegment right)
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{
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return !left.Equals(right);
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}
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#endregion
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}
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}
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