UwU Linter — Syntax Highlighter for UwU Language

UwU Linter is a lightweight Visual Studio Code extension that adds syntax highlighting and semantic decorations for the custom UwU language.

It identifies keywords, variables, types, operators, numbers, comments, strings, functions, and more — applying a fun, visually distinct color palette to make code easier to read.

Features

UwU Linter provides semantic highlighting for the UwU DSL, including:

✔ Keywords

bring, fun, nofun, loop, noloop, if, elif, else, noif, from, to

✔ Types

int, float, string, bool, nothing, list, dict, char

✔ Operators

+, - (not part of ->), *, /, ==, !=, <=, >=, <, >

✔ Special Syntax

• Function definitions (fun name -> returnType)
• Variable declarations
• Strings ("hello" or 'hello')
• Comments (<.< ... >.> or >.< comment)
• The ~ tilt operator
• Numbers

✔ Custom Palette

Colors are loaded from:

config/palette.json

Allowing full customization of the theme.

Usage

Once installed:

1. Open any .uwu file (or any file you want highlighted)
2. Press Ctrl + Shift + P
3. Run:

Uwu Linter: Decorate Text

The extension will parse your document and apply semantic decorations based on the defined palette.

How It Works

UwU Linter includes a custom tokenizer that:

1. Scans the document for:

   • Comments
   • Strings
   • Keywords
   • Variables
   • Function names
   • Operators
   • Types
   • Numbers

2. Ignores matches inside comments or strings (so false positives won’t get highlighted)

3. Applies decorations using TextEditorDecorationType objects created from the color palette.

Everything is driven by regular expressions and a two-pass tokenizer:

• First pass: detect comments + strings
• Second pass: detect syntax tokens outside of them

This keeps highlights fast and accurate.

Customizing Colors

You can edit:

config/palette.json

Example:

{
  "colors": {
    "keyword": "#ff79c6",
    "comment": "#6272a4",
    "variables": "#8be9fd",
    "type": "#bd93f9",
    "functions": "#50fa7b",
    "tilt": "#ffb86c",
    "string": "#f1fa8c",
    "operators": "#ff5555",
    "number": "#8be9fd"
  }
}

Restart the extension or reload the window to apply new colors.

Command List