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About the developer

connorskees
140 Stars 10 Forks MIT License 1.6K Commits 13 Opened issues

Description

A near-feature-complete Sass compiler written purely in Rust

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grass

This crate aims to provide a high level interface for compiling Sass into plain CSS. It offers a very limited API, currently exposing only 2 functions.

In addition to a library, also included is a binary that is intended to act as an invisible replacement to the Sass commandline executable.

This crate aims to achieve complete feature parity with the

dart-sass
reference implementation. A deviation from the
dart-sass
implementation can be considered a bug except for in the following situations:
  • Error messages
  • Error spans
  • Certain aspects of the indented syntax
  • Potentially others in the future

Documentation
crates.io

Status

The large features remaining are

indented syntax
css imports
@forward
compressed output

This is in addition to dozens of smaller features, edge cases, and miscompilations.

Starting from

grass v0.9.4
, it is possible to compile Twitter Bootstrap 4 as well as bulma-scss.

The output is not exact byte-for-byte, and the remaining differences in output are tracked here.

Web Assembly

grass
experimentally releases a WASM version of the library to npm, compiled using wasm-bindgen. To use
grass
in your JavaScript projects, just run
npm install @connorskees/grass
to your package.json. Better documentation for this version will be provided when the library becomes more stable.

Features

commandline

(enabled by default): build a binary using clap

random

(enabled by default): enable the builtin functions

random([$limit])
and
unique-id()

In the future this feature will be removed when it is no longer necessary to rely on

rand
for random numbers.

Testing

As much as possible this library attempts to follow the same philosophy for testing as

rust-analyzer
. Namely, all one should have to do is run

cargo test
to run all its tests. This library maintains a test suite distinct from the
sass-spec
, though it does include some spec tests verbatim. This has the benefit of allowing tests to be run without ruby as well as allowing the tests more granular than they are in the official spec.

Having said that, to run the official test suite,

git clone https://github.com/connorskees/grass --recursive
cd grass
cargo b --release
./sass-spec/sass-spec.rb -c './target/release/grass'

Note: you will have to install ruby, bundler and run

bundle install
in
./sass-spec/
. This might also require you to install the requirements separately for curses.

These numbers come from a default run of the Sass specification as shown above.

2020-11-16
PASSING: 3415
FAILING: 1678
TOTAL: 5093
2020-08-15
PASSING: 3384
FAILING: 1703
TOTAL: 5093
2020-07-24
PASSING: 2935
FAILING: 2158
TOTAL: 5093
2020-06-07
PASSING: 2442
FAILING: 2651
TOTAL: 5093
2020-05-01
PASSING: 2193
FAILING: 2900
TOTAL: 5093
2020-04-01
PASSING: 1711
FAILING: 3382
TOTAL: 5093
2020-03-22
PASSING: 1442
FAILING: 3651
TOTAL: 5093
2020-02-03
PASSING: 242
FAILING: 4851
TOTAL: 5093
2020-01-20
PASSING: 143
FAILING: 4950
TOTAL: 5093

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