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CONTRIBUTING.md

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Coding Style

This project uses PSR-12 with consistent brace placement. This means that the opening brace is always on the same line, even for class and method declarations.

Tools

This project uses PHP-CS-Fixer and PHPStan. You can invoke them using make:

make php-cs-fixer
make phpstan

Adding support for new PHP syntax

  1. If necessary, add emulation support for new tokens.
    • Add a new subclass of Lexer\TokenEmulator. Take inspiration from existing classes.
    • Add the new class to the array in Lexer\Emulative.
    • Add tests for the emulation in Lexer\EmulativeTest. You'll want to modify provideTestReplaceKeywords() for new reserved keywords and provideTestLexNewFeatures() for other emulations.
  2. Add any new node classes that are needed.
  3. Add support for the new syntax in grammar/php.y. Regenerate the parser by running php grammar/rebuildParsers.php. Use --debug if there are conflicts.
  4. Add pretty-printing support by implementing a pFooBar() method in PrettyPrinter\Standard.
  5. Add tests both in test/code/parser and test/code/prettyPrinter.
  6. Add support for formatting-preserving pretty-printing. This is done by modifying the data tables at the end of PrettyPrinterAbstract. Add a test in test/code/formatPreservation.
  7. Does the new syntax feature namespaced names? If so, add support for name resolution in NodeVisitor\NameResolver. Test it in NodeVisitor\NameResolverTest.
  8. Does the new syntax require any changes to builders? Is so, make them :)