https://github.com/squarespace/less-compiler

Less compiler in Java
https://github.com/squarespace/less-compiler

Last synced: 3 months ago
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Less compiler in Java

• Host: GitHub
• URL: https://github.com/squarespace/less-compiler
• Owner: Squarespace
• License: apache-2.0
• Created: 2015-05-21T13:51:11.000Z (about 10 years ago)
• Default Branch: main
• Last Pushed: 2024-01-03T11:11:56.000Z (over 1 year ago)
• Last Synced: 2025-03-26T01:41:32.244Z (4 months ago)
• Language: Java
• Homepage:
• Size: 2.41 MB
• Stars: 19
• Watchers: 14
• Forks: 9
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt
  • Codeowners: CODEOWNERS
  • Roadmap: ROADMAP.md

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README

        

# Squarespace LESS Compiler

A Java implementation of the LESS CSS preprocessor language.

[![Build Status](https://travis-ci.org/Squarespace/less-compiler.svg?branch=master)](https://travis-ci.org/Squarespace/less-compiler)

[![Coverage Status](https://coveralls.io/repos/Squarespace/less-compiler/badge.svg?branch=1.x&service=github)](https://coveralls.io/github/Squarespace/less-compiler?branch=1.x)

Current [Less.js][lessjs] compatibility level: 1.3.3

License: [Apache 2.0](LICENSE.txt) ([summary][license-tldr])

Copyright (c) 2021 Squarespace, Inc.

## Project Goals

 * Migrate away from use of [Node.js][nodejs] + [Less.js][lessjs] for server-side

conversion of LESS to CSS.

 * Maintain compatibility with [Less.js][lessjs], tracking version 1.3.3

   (Squarespace's supported version at the time of development).

 * Improve performance, reduce memory usage where possible.

 * Design must support additional features needed for server-side compilation.

 * Design parsing package to closely track the [Less.js][lessjs] parser

   structure, to simplify verifying correctness.

## Features

 * Performance improvement of 2-5x over Less.js when used in server context

 * Improved error messages with [full stack traces](docs/error-stack-trace.md)

 * [Execution trace mode](docs/execution-trace.md)

 * Modular parser that supports fine-grained unit testing of syntax fragments

 * High test coverage.

## Differences

 * JavaScript evaluation support is missing.  It may return if / when we can

   guarantee speed and safety of JS evaluation in the JVM (Java 8's Nashorn may

   provide this).

 * Final CSS structure is generated by feeding blocks and rules to a simple

   model that ensures they are emitted at the correct scope in the output

   document.

 * Color keywords can participate in math operations.

 * See more complete [list of differences](DIFFERENCES.md)

## Usage

    git clone [email protected]:Squarespace/squarespace-less.git

    cd squarespace-less

    gradle makeCli

    ./lessc -h

[lessjs]: http://lesscss.org/  "Less.js"

[nodejs]: http://nodejs.org/ "Node.js"

[license-tldr]: https://tldrlegal.com/license/apache-license-2.0-(apache-2.0) "Apache 2.0 tl;dr"