README.md



What do all those files mean?


php5.y:             PHP 5 grammar written in a pseudo language

php7.y:             PHP 7 grammar written in a pseudo language

tokens.y:           Tokens definition shared between PHP 5 and PHP 7 grammars

parser.template:    A kmyacc parser prototype file for PHP

tokens.template:    A kmyacc prototype file for the Tokens class

rebuildParsers.php: Preprocesses the grammar and builds the parser using kmyacc


.phpy pseudo language

The .y file is a normal grammar 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 rebuildParsers.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 rebuildParsers.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.