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Improve performance of SourceText.LineInfo indexer. #74267

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Merged
merged 3 commits into from
Jul 17, 2024
Merged

Improve performance of SourceText.LineInfo indexer. #74267

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8064585
Improve performance of SourceText.LineInfo indexer.
ToddGrun Jul 3, 2024
9e60abe
Add some asserts for parameter validation
ToddGrun Jul 4, 2024
a2d8a31
Rename method to better indicate implications of usage
ToddGrun Jul 15, 2024
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4 changes: 2 additions & 2 deletions src/Compilers/Core/Portable/Text/SourceText.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -966,12 +966,12 @@ public override TextLine this[int index]
int start = _lineStarts[index];
if (index == _lineStarts.Count - 1)
{
return TextLine.FromSpan(_text, TextSpan.FromBounds(start, _text.Length));
return TextLine.FromSpanUnsafe(_text, TextSpan.FromBounds(start, _text.Length));
}
else
{
int end = _lineStarts[index + 1];
return TextLine.FromSpan(_text, TextSpan.FromBounds(start, end));
return TextLine.FromSpanUnsafe(_text, TextSpan.FromBounds(start, end));
}
}
}
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12 changes: 12 additions & 0 deletions src/Compilers/Core/Portable/Text/TextLine.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
// See the LICENSE file in the project root for more information.

using System;
using System.Diagnostics;
using Roslyn.Utilities;

namespace Microsoft.CodeAnalysis.Text
Expand Down Expand Up @@ -81,6 +82,17 @@ public static TextLine FromSpan(SourceText text, TextSpan span)
}
}

// Do not use unless you are certain the span you are passing in is valid!
// This was added to allow SourceText.LineInfo's indexer to directly create TextLines
// without the performance implications of calling FromSpan.
internal static TextLine FromSpanUnsafe(SourceText text, TextSpan span)
{
Debug.Assert(span.Start == 0 || TextUtilities.IsAnyLineBreakCharacter(text[span.Start - 1]));
Debug.Assert(span.End == text.Length || TextUtilities.IsAnyLineBreakCharacter(text[span.End - 1]));

return new TextLine(text, span.Start, span.End);
}

/// <summary>
/// Gets the source text.
/// </summary>
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