Add Razor language support for .razor and .cshtml

[meeksoft]

Adds Razor syntax highlighting for Blazor components (.razor) and ASP.NET Core Razor Pages / MVC views (.cshtml), following the guidance in zed-industries/extensions#7567 to bring this into the C# extension.

Fixes #41.

What's included

• Razor language (languages/razor/) registered for .razor and .cshtml, with highlighting for directives, implicit/explicit expressions, control-flow blocks, and C# code blocks; plus bracket matching, auto-indentation, and razor code fences.
• Grammar pins in extension.toml:
  • razor → Meeksoft/tree-sitter-razor @ 97ce5a5 — fork of tris203/tree-sitter-razor @ d4664e4 (current main), adding parsing of Razor expressions inside quoted HTML attribute values and queryable attribute names.
  • html_razor → Meeksoft/tree-sitter-html @ bb3ca3e — fork of tree-sitter/tree-sitter-html @ bfa075d (the revision Zed's html extension pins), whose quoted attribute values may contain Razor expressions.
• Markup is highlighted by injecting a hidden html-razor language (languages/html-razor/, ~50 lines of queries) instead of plain html, so values like data-date="@x.ToString("o")" keep their string colors instead of terminating at the first inner quote. CSS in <style> and JS in <script> still highlight through the standard injection chain.

Scope

Editing support only. No language server is attached to Razor buffers, and .cs, .csproj, and .slnx behavior is unchanged.

Screenshots

Dashboard.cshtml + ProductCatalog.razor in VS Code Dark Modern:

The same files in Ayu Mirage:

Verification

Installed as a dev extension and verified:

• .cs, .csproj, .slnx highlighting and language servers unchanged
• .razor / .cshtml recognized as Razor; directives, expressions, and control flow highlighted
• CSS/JS injections inside <style> / <script> work
• Attribute expressions with nested quotes colored correctly
• No language server starts for Razor buffers

[Copilot]

🟡 Changes recommended

languages/html-razor/highlights.scm uses nonstandard capture names (@punctuation.*.html) that are inconsistent with the repo’s other queries and may not be themed correctly in Zed.

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Pull request overview

This PR adds a Razor language definition to the C# Zed extension so .razor (Blazor components) and .cshtml (ASP.NET Razor Pages/MVC views) get syntax highlighting and basic editor behaviors, while leaving existing C# / project-file behavior unchanged.

Changes:

• Registers a new Razor language for .razor and .cshtml, including syntax highlighting, bracket matching, and indentation rules.
• Adds a hidden html-razor language used for markup highlighting/injection so Razor expressions inside quoted attribute values don’t break string coloring.
• Pins tree-sitter grammars for razor and a forked html_razor in extension.toml.

File summaries

File	Description
README.md	Updates extension description to mention Razor highlighting.
extension.toml	Adds grammar pins for razor and html_razor.
languages/razor/config.toml	Registers the Razor language and file suffixes.
languages/razor/highlights.scm	Adds Razor + inlined C# highlighting queries and overrides.
languages/razor/injections.scm	Injects markup regions into html-razor for consistent HTML/CSS/JS highlighting.
languages/razor/indents.scm	Defines indentation behavior for braces/brackets/parentheses.
languages/razor/brackets.scm	Defines bracket matching pairs for Razor buffers.
languages/html-razor/config.toml	Adds hidden html-razor language used only for injections.
languages/html-razor/highlights.scm	Provides markup highlighting used by injected html-razor layers.
languages/html-razor/injections.scm	Injects CSS/JS inside <style>/<script> and common attribute contexts.

Review details

Suppressed comments (1)

languages/html-razor/highlights.scm:25

• html-razor uses @punctuation.bracket.html for tag delimiters; other query files in this repo use standard captures like @punctuation.bracket/@punctuation.delimiter without language suffixes. Using the standard capture improves theme compatibility and keeps punctuation coloring consistent.

[
  "<"
  ">"
  "<!"
  "</"
  "/>"
] @punctuation.bracket.html

• Files reviewed: 10/12 changed files
• Comments generated: 1
• Review effort level: Lite

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