A Sass* to Lua compiler

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Stylesheets are pretty cool. Writing them in Lua is not.
Here’s a compiler to make stylesheets from a sass-like (lass) language to lua if you (like me) have some niche reason to not use Studio’s style editor

Installation

  1. Install rust
  2. Run cargo install rbx-lass
  3. Run rbx-lass <input files> -o <output file>

Example lass file

// Only double slash comments are supported, and are not emitted
:root
    --MyFavoriteColor: Color3.new(0, 1, 0)

TextButton, TextLabel
    TextColor3: Color3.new(1, 1, 1)
    BackgroundTransparency: 1
    &:Hover
        BackgroundTransparency: 0.5

// You can specify priority like this
@priority(10)
TextButton.special
    // Instead of var(--MyVar) you do "$MyVar"
    TextColor3: "$MyFavoriteColor"

another sample input
and its output

After that you can put this in the rest of your codebase

local stylesheet: StyleSheet = require(path.to.output)

Limitations

  • Style rules can only be one line
  • Lua expressions are not validated at all
  • Fancy stuff like constants, mixins, functions and such are not supported
  • Really unhelpful compiler responses
  • Multiple input files are merged into one output instead of doing complicated StyleDerive stuff which I honestly don’t understand
  • Probably really buggy

I heavy referenced css comparisons so if there’s something wrong with that page there is something wrong with lass as well

Can I use CSS/SCSS instead?
No

I found bugs
From my testing things should work decently well but if there are problems, go here

and then, of course
source