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Fix JavaScript highlighting in Razor files after C# control structures without braces #8865

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Fix JavaScript highlighting in Razor files after C# control structures without braces #8865

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Copilot AI commented Dec 19, 2025 •
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JavaScript in <script> blocks loses syntax highlighting when preceded by C# control structures without braces in Razor files. This occurs because the TextMate grammar pattern for control structures only ended after seeing a closing brace }, causing single-statement control structures to consume subsequent content.

Changes

  • Modified control structure end patterns: Updated end condition from '(?<=})' to '(?<=})|(?<=;)|(?=^\s*\})' for all C# control structures (if, else, for, foreach, using, lock, do, switch, try, catch, finally)
  • Added test coverage: Two new test cases verify JavaScript highlighting after control structures without braces

Example

Before (JavaScript not highlighted):

@{
    if (l == 1)
        Console.WriteLine("test");
}

<script>
$(document).on("ready", function() {
    console.log("not working");  // No highlighting
});
</script>

After (JavaScript properly highlighted):

@{
    if (l == 1)
        Console.WriteLine("test");
}

<script>
$(document).on("ready", function() {
    console.log("working");  // Full syntax highlighting
});
</script>

The pattern now terminates after semicolons (single statements) and before closing braces at line start (parent block boundaries), in addition to the existing behavior for control structure blocks.

Original prompt

This section details on the original issue you should resolve

<issue_title>JavaScript coloring does not work in all .cshtml files</issue_title>
<issue_description>This issue has been moved from a ticket on Developer Community.

[severity:It bothers me. A fix would be nice]
In some .cshtml files, JavaScript coloring does not work.

Examples:

Working
image.png

Not working
image.png

Both files are partial views. Checked code syntax - everything is good.
Tried re-opening file - nothing.
Tried solutions in this SO thread - nothing. (https://stackoverflow.com/questions/78189420/syntax-highlighting-visual-studio-2022-in-cshtml-files-not-working)

Original Comments

Feedback Bot on 11/11/2025, 00:44 PM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

Jonas Gucu on 11/12/2025, 05:12 AM:

After a bit of experimentation, it looks like sometimes C# code breaks the rest of the code.
In this case it’s an if statement not having curly braces.

Working example:
Image

Not working example:
Image

<agent_instructions>Please fix our textmate grammar so script blocks after C# if statements, without braces, are colored correctly.</agent_instructions>

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Copilot AI changed the title [WIP] Fix JavaScript coloring in .cshtml files Fix JavaScript highlighting in Razor files after C# control structures without braces Dec 19, 2025
Copilot AI requested a review from davidwengier December 19, 2025 05:13
@davidwengier
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davidwengier commented Dec 19, 2025

If for no other reason, copilot is worth its weight in gold for textmate updates

@davidwengier davidwengier marked this pull request as ready for review December 19, 2025 05:20
@davidwengier davidwengier requested review from a team as code owners December 19, 2025 05:20
@davidwengier davidwengier mentioned this pull request Dec 19, 2025
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JavaScript coloring does not work in all .cshtml files

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