scssphp is a compiler for SCSS written in PHP.

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v1.12.1 2024-01-13 12:36 UTC


Build License

scssphp is a compiler for SCSS written in PHP.

Checkout the homepage,, for directions on how to use.

Running Tests

scssphp uses PHPUnit for testing.

Run the following command from the root directory to run every test:

vendor/bin/phpunit tests

There are several tests in the tests/ directory:

  • ApiTest.php contains various unit tests that test the PHP interface.
  • ExceptionTest.php contains unit tests that test for exceptions thrown by the parser and compiler.
  • FailingTest.php contains tests reported in Github issues that demonstrate compatibility bugs.
  • InputTest.php compiles every .scss file in the tests/inputs directory then compares to the respective .css file in the tests/outputs directory.
  • SassSpecTest.php extracts tests from the sass/sass-spec repository.

When changing any of the tests in tests/inputs, the tests will most likely fail because the output has changed. Once you verify that the output is correct you can run the following command to rebuild all the tests:

BUILD=1 vendor/bin/phpunit tests

This will compile all the tests, and save results into tests/outputs. It also updates the list of excluded specs from sass-spec.

To enable the full sass-spec compatibility tests:

TEST_SASS_SPEC=1 vendor/bin/phpunit tests

Coding Standard

scssphp source conforms to PSR12.

Run the following command from the root directory to check the code for "sniffs".

vendor/bin/phpcs --standard=PSR12 --extensions=php bin src tests *.php

Static Analysis

scssphp uses phpstan for static analysis.

Run the following command from the root directory to analyse the codebase:

make phpstan

As most of the codebase is composed of legacy code which cannot be type-checked fully, the setup contains a baseline file with all errors we want to ignore. In particular, we ignore all errors related to not specifying the types inside arrays when these arrays correspond to the representation of Sass values and Sass AST nodes in the parser and compiler. When contributing, the proper process to deal with static analysis is the following:

  1. Make your change in the codebase
  2. Run make phpstan
  3. Fix errors reported by phpstan when possible
  4. Repeat step 2 and 3 until nothing gets fixed anymore at step 3
  5. Run make phpstan-baseline to regenerate the phpstan baseline

Additions to the baseline will be reviewed to avoid ignoring errors that should have been fixed.