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