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PHP-Parser/grammar
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Nikita Popov 977cbab8e7 Decrement errorState when recovering from -> error 
It's likely that an error after -> will trigger another one due to
missing semicolon without shifting a single token. We prevent an
immediate failure in this case by manually setting errorState to 2,
which will suppress the duplicate error message, but allow error
recovery.
2016-07-25 17:37:54 +02:00
..
parser.template Move token constants into separate class 2015-06-13 18:39:55 +02:00
php5.y Decrement errorState when recovering from -> error 2016-07-25 17:37:54 +02:00
php7.y Decrement errorState when recovering from -> error 2016-07-25 17:37:54 +02:00
README.md Remove analyze.php 2016-07-25 13:38:05 +02:00
rebuildParsers.php Add string kinds and doc string labels 2016-04-07 12:09:00 +09:00
tokens.template Move token constants into separate class 2015-06-13 18:39:55 +02:00
tokens.y Implement generalized yield operator 2015-06-13 18:11:40 +02:00

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
  • rebuildParser.php: Preprocesses the grammar and builds the parser using kmyacc

.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.