Four new CodeMirror 6 language packages: C, Lua, Luau, and Scala

v6
1

Hi everyone!

I’ve recently created four new language packages for CodeMirror 6:

  • @fazelstudio/codemirror-lang-c — C language support

  • @fazelstudio/codemirror-lang-lua — Lua 5.4 language support

  • @fazelstudio/codemirror-lang-luau — Luau language support

  • @fazelstudio/codemirror-lang-scala — Scala 3 language support

All four packages use native Lezer grammars and are designed specifically for CodeMirror 6.

C

@fazelstudio/codemirror-lang-c provides C17 syntax support with:

  • Syntax highlighting

  • Incremental parsing

  • Code indentation

  • Code folding

  • Preprocessor directive recognition

  • Support for several commonly used compiler extensions such as __attribute__, __declspec, typeof, and asm

The parser primarily targets ISO C17, with selected C11/C23 features.

GitHub: GitHub - fazel-studio/codemirror-lang-c: C language support for the CodeMirror code editor · GitHub

Lua

@fazelstudio/codemirror-lang-lua targets Lua 5.4 and includes:

  • Full Lua 5.4 syntax

  • Syntax highlighting

  • Autocomplete with Lua standard-library and keyword completions

  • Snippets

  • Automatic indentation

  • Code folding

  • Bracket matching

  • Long strings and comments

  • Labels and goto

  • Lua 5.4 attributes such as <const> and <close>

GitHub: GitHub - fazel-studio/codemirror-lang-lua: Lua language support for CodeMirror 6 · GitHub

Luau

@fazelstudio/codemirror-lang-luau supports Luau syntax, including Lua 5.1 compatibility and Luau-specific features such as:

  • Gradual typing and type annotations

  • Type aliases and generic types

  • Union, intersection, and optional types

  • Type casts

  • export type

  • String interpolation

  • If expressions

  • Compound assignment operators

  • Bitwise operators

  • continue

  • Function attributes

  • Syntax highlighting

  • Automatic indentation

  • Code folding

GitHub: GitHub - fazel-studio/codemirror-lang-luau: Luau language support for the CodeMirror code editor · GitHub

Scala

@fazelstudio/codemirror-lang-scala provides Scala 3 language support, including:

  • Classes, traits, objects, enums, and case classes

  • Pattern matching

  • For-comprehensions

  • Significant indentation / optional braces

  • String interpolation

  • XML literals

  • Generic types with variance

  • Union and intersection types

  • Type lambdas

  • given / using

  • Extension methods

  • Opaque types

  • Scaladoc comments

GitHub: GitHub - fazel-studio/codemirror-lang-scala: Scala language support for the CodeMirror code editor · GitHub

All four packages are released under the MIT license.

The packages are available on npm:

  • @fazelstudio/codemirror-lang-c

  • @fazelstudio/codemirror-lang-lua

  • @fazelstudio/codemirror-lang-luau

  • @fazelstudio/codemirror-lang-scala

I’d really appreciate feedback from the CodeMirror community, especially regarding grammar coverage, parsing edge cases, highlighting, indentation, and areas where these language packages could be improved.

Thanks!

2

Wow, they just keep coming. Are you LLM-coding these, or are you just really good at writing grammars by this point?

3

I am currently building a code editor application that uses CodeMirror 6 as its engine. You can check it out at github/fazel-studio.

I created it for my own application’s needs, but I decided to publish it so others can use it as well.