phabel/php-parser
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php-parser/grammar/README.md
Nikita Popov 51ec2a25fe Move parser to Parser\Php5 
Old name still exists.
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What do all those files mean?

  • php5.y: PHP 5 grammer written in a pseudo language
  • analyze.php: Analyzes the grammer and outputs some info about it
  • rebuildParser.php: Preprocesses the grammar and builds the parser using kmyacc
  • kmyacc.php.parser: A kmyacc parser prototype file for PHP

.phpy pseudo language

The .y file is a normal grammer in kmyacc (yacc) style, with some transformations applied to it:

  • Nodes are created using the syntax Name[..., ...]. This is transformed into new Name(..., ..., attributes())
  • Some function-like constructs are resolved (see rebuildParser.php for a list)

Building the parser

In order to rebuild the parser, you need moriyoshi's fork of kmyacc. After you compiled/installed it, run the rebuildParser.php script.

By default only the Parser.php is built. If you want to additionally emit debug symbols and create y.output, run the script with --debug. If you want to retain the preprocessed grammar pass --keep-tmp-grammar.