Fix glitch in code blocks

Author: theletterf

src/Elastic.Markdown/Myst/MarkdownParser.cs

@@ -180,10 +180,21 @@ public static MarkdownPipeline Pipeline
 
 	/// <summary>
 	/// Preprocesses substitutions specifically in link patterns [text](url) before Markdig parsing
+	/// Only processes links that are not inside code blocks with subs=false
 	/// </summary>
-	private static string PreprocessLinkSubstitutions(string markdown, ParserContext context) =>
-		LinkPattern().Replace(markdown, match =>
+	private static string PreprocessLinkSubstitutions(string markdown, ParserContext context)
+	{
+		// Find all code block boundaries to avoid processing links inside subs=false blocks
+		var codeBlockRanges = GetCodeBlockRanges(markdown);
+
+		return LinkPattern().Replace(markdown, match =>
 		{
+			// Check if this link is inside a code block with subs=false
+			if (IsInsideSubsDisabledCodeBlock(match.Index, codeBlockRanges))
+			{
+				return match.Value; // Don't process links in subs=false code blocks
+			}
+
 			var linkText = match.Groups[1].Value;
 			var linkUrl = match.Groups[2].Value;
 
@@ -200,4 +211,54 @@ private static string PreprocessLinkSubstitutions(string markdown, ParserContext
 			// Return original match for internal links
 			return match.Value;
 		});
+	}
+
+	private static List<(int start, int end, bool subsDisabled)> GetCodeBlockRanges(string markdown)
+	{
+		var ranges = new List<(int start, int end, bool subsDisabled)>();
+		var lines = markdown.Split('\n');
+		var currentPos = 0;
+
+		for (var i = 0; i < lines.Length; i++)
+		{
+			var line = lines[i];
+
+			// Check for code block start (``` or ````)
+			if (line.TrimStart().StartsWith("```"))
+			{
+				// Check if this line contains subs=false
+				var subsDisabled = line.Contains("subs=false");
+				var blockStart = currentPos;
+
+				// Find the end of the code block
+				var blockEnd = currentPos + line.Length;
+				for (var j = i + 1; j < lines.Length; j++)
+				{
+					blockEnd += lines[j].Length + 1; // +1 for newline
+					if (lines[j].TrimStart().StartsWith("```"))
+					{
+						break;
+					}
+				}
+
+				ranges.Add((blockStart, blockEnd, subsDisabled));
+			}
+
+			currentPos += line.Length + 1; // +1 for newline
+		}
+
+		return ranges;
+	}
+
+	private static bool IsInsideSubsDisabledCodeBlock(int index, List<(int start, int end, bool subsDisabled)> codeBlockRanges)
+	{
+		foreach (var (start, end, subsDisabled) in codeBlockRanges)
+		{
+			if (index >= start && index <= end && subsDisabled)
+			{
+				return true;
+			}
+		}
+		return false;
+	}
 }