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PHP-Parser/grammar
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Nikita Popov 8863f92b58 Support readonly before DNF type 
This makes us match the PHP 8.2 handling of readonly. Handling of
"readonly" functions is moved to the parser to allow distinguishing
them from readonly properties with DNF types. We have to uglify the
grammar to avoid some shift/reduce conflicts. Thank you WordPress.

(cherry-picked from 0dd85ebd34d7463d53ec92035105b04799a687e1)
2023-01-16 22:19:17 +01:00
..
parser.template
Rename YYNLSTATES to numNonLeafStates
2017-11-12 16:09:00 +01:00
php5.y
Support readonly before DNF type
2023-01-16 22:19:17 +01:00
php7.y
Support readonly before DNF type
2023-01-16 22:19:17 +01:00
phpyLang.php
[String_] Add rawValue attribute (#831)
2022-05-15 23:04:59 +02:00
README.md
Default to using php-yacc to generate the parsers
2019-10-19 15:24:38 +02:00
rebuildParsers.php
Moved phpy pseudo lang functions to separate file
2021-04-10 13:40:52 +02:00
tokens.template
Move token constants into separate class
2015-06-13 18:39:55 +02:00
tokens.y
Add support for new PHP 8.1 modifiers (#796)
2021-07-21 12:43:29 +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
  • 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

Run php grammar/rebuildParsers.php to rebuild the parsers. Additional options:

  • The KMYACC environment variable can be used to specify an alternative kmyacc binary. By default the phpyacc dev dependency will be used. To use the original kmyacc, you need to compile moriyoshi's fork.
  • The --debug option enables emission of debug symbols and creates the y.output file.
  • The --keep-tmp-grammar option preserves the preprocessed grammar file.