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Code Issues 690 Packages Projects Releases 20 Wiki Activity

Make AlertBlock parsing a bit cheaper

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This commit is contained in:
Miha Zupan
2025-04-14 22:02:21 +02:00
parent 7a83a1fd3d
commit 0d6343b421
2 changed files with 24 additions and 17 deletions
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2
src/Markdig/Extensions/Alerts/AlertBlock.cs
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@@ -22,7 +22,7 @@ public class AlertBlock : QuoteBlock
}
/// <summary>
/// Gets or sets the kind of the alert block (e.g `NOTE`, `TIP`, `IMPORTANT`, `WARNING`, `CAUTION`)
/// Gets or sets the kind of the alert block (e.g `NOTE`, `TIP`, `IMPORTANT`, `WARNING`, `CAUTION`).
/// </summary>
public StringSlice Kind { get; set; }

39
src/Markdig/Extensions/Alerts/AlertInlineParser.cs
View File

@@ -15,6 +15,9 @@ namespace Markdig.Extensions.Alerts;
/// <seealso cref="InlineParser" />
public class AlertInlineParser : InlineParser
{
private static readonly TransformedStringCache s_alertTypeClassCache = new(
type => $"markdown-alert-{type.ToLowerInvariant()}");
/// <summary>
/// Initializes a new instance of the <see cref="AlertInlineParser"/> class.
/// </summary>
@@ -25,27 +28,30 @@ public class AlertInlineParser : InlineParser
public override bool Match(InlineProcessor processor, ref StringSlice slice)
{
if (slice.PeekChar() != '!')
{
return false;
}
// We expect the alert to be the first child of a quote block. Example:
// > [!NOTE]
// > This is a note
if (processor.Block is not ParagraphBlock paragraphBlock || paragraphBlock.Parent is not QuoteBlock quoteBlock || paragraphBlock.Inline?.FirstChild != null
|| quoteBlock is AlertBlock || quoteBlock.Parent is not MarkdownDocument)
if (processor.Block is not ParagraphBlock paragraphBlock ||
paragraphBlock.Parent is not QuoteBlock quoteBlock ||
paragraphBlock.Inline?.FirstChild != null ||
quoteBlock is AlertBlock ||
quoteBlock.Parent is not MarkdownDocument)
{
return false;
}
var saved = slice;
var c = slice.NextChar();
if (c != '!')
{
slice = saved;
return false;
}
StringSlice saved = slice;
c = slice.NextChar(); // Skip !
slice.SkipChar(); // Skip [
char c = slice.NextChar(); // Skip !
var start = slice.Start;
var end = start;
int start = slice.Start;
int end = start;
while (c.IsAlpha())
{
end = slice.Start;
@@ -76,13 +82,13 @@ public class AlertInlineParser : InlineParser
end = slice.Start;
if (c == '\n')
{
slice.NextChar(); // Skip \n
slice.SkipChar(); // Skip \n
}
}
}
else if (c == '\n')
{
slice.NextChar(); // Skip \n
slice.SkipChar(); // Skip \n
}
break;
}
@@ -103,8 +109,9 @@ public class AlertInlineParser : InlineParser
Column = quoteBlock.Column,
};
alertBlock.GetAttributes().AddClass("markdown-alert");
alertBlock.GetAttributes().AddClass($"markdown-alert-{alertType.ToString().ToLowerInvariant()}");
HtmlAttributes attributes = alertBlock.GetAttributes();
attributes.AddClass("markdown-alert");
attributes.AddClass(s_alertTypeClassCache.Get(alertType.AsSpan()));
// Replace the quote block with the alert block
var parentQuoteBlock = quoteBlock.Parent!;