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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Globalization;
namespace System.Web.Razor.Text
{
[Serializable]
public struct SourceLocation : IEquatable<SourceLocation>, IComparable<SourceLocation>
{
public static readonly SourceLocation Undefined = CreateUndefined();
public static readonly SourceLocation Zero = new SourceLocation(0, 0, 0);
private int _absoluteIndex;
private int _lineIndex;
private int _characterIndex;
public SourceLocation(int absoluteIndex, int lineIndex, int characterIndex)
{
_absoluteIndex = absoluteIndex;
_lineIndex = lineIndex;
_characterIndex = characterIndex;
}
public int AbsoluteIndex
{
get { return _absoluteIndex; }
}
public int LineIndex
{
get { return _lineIndex; }
}
public int CharacterIndex
{
get { return _characterIndex; }
}
public override string ToString()
{
return String.Format(CultureInfo.CurrentCulture, "({0}:{1},{2})", AbsoluteIndex, LineIndex, CharacterIndex);
}
public override bool Equals(object obj)
{
return (obj is SourceLocation) && Equals((SourceLocation)obj);
}
public override int GetHashCode()
{
// LineIndex and CharacterIndex can be calculated from AbsoluteIndex and the document content.
return AbsoluteIndex;
}
public bool Equals(SourceLocation other)
{
if (other == null)
{
throw new ArgumentNullException("other");
}
return AbsoluteIndex == other.AbsoluteIndex &&
LineIndex == other.LineIndex &&
CharacterIndex == other.CharacterIndex;
}
public int CompareTo(SourceLocation other)
{
return AbsoluteIndex.CompareTo(other.AbsoluteIndex);
}
public static SourceLocation Advance(SourceLocation left, string text)
{
SourceLocationTracker tracker = new SourceLocationTracker(left);
tracker.UpdateLocation(text);
return tracker.CurrentLocation;
}
public static SourceLocation Add(SourceLocation left, SourceLocation right)
{
if (right.LineIndex > 0)
{
// Column index doesn't matter
return new SourceLocation(left.AbsoluteIndex + right.AbsoluteIndex, left.LineIndex + right.LineIndex, right.CharacterIndex);
}
else
{
return new SourceLocation(left.AbsoluteIndex + right.AbsoluteIndex, left.LineIndex + right.LineIndex, left.CharacterIndex + right.CharacterIndex);
}
}
public static SourceLocation Subtract(SourceLocation left, SourceLocation right)
{
return new SourceLocation(left.AbsoluteIndex - right.AbsoluteIndex,
left.LineIndex - right.LineIndex,
left.LineIndex != right.LineIndex ? left.CharacterIndex : left.CharacterIndex - right.CharacterIndex);
}
private static SourceLocation CreateUndefined()
{
SourceLocation sl = new SourceLocation();
sl._absoluteIndex = -1;
sl._lineIndex = -1;
sl._characterIndex = -1;
return sl;
}
public static bool operator <(SourceLocation left, SourceLocation right)
{
return left.CompareTo(right) < 0;
}
public static bool operator >(SourceLocation left, SourceLocation right)
{
return left.CompareTo(right) > 0;
}
public static bool operator ==(SourceLocation left, SourceLocation right)
{
return left.Equals(right);
}
public static bool operator !=(SourceLocation left, SourceLocation right)
{
return !left.Equals(right);
}
public static SourceLocation operator +(SourceLocation left, SourceLocation right)
{
return Add(left, right);
}
public static SourceLocation operator -(SourceLocation left, SourceLocation right)
{
return Subtract(left, right);
}
}
}
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