.. | ||
parser.template | ||
php5.y | ||
php7.y | ||
phpyLang.php | ||
README.md | ||
rebuildParsers.php | ||
tokens.template | ||
tokens.y |
What do all those files mean?
php5.y
: PHP 5 grammar written in a pseudo languagephp7.y
: PHP 7 grammar written in a pseudo languagetokens.y
: Tokens definition shared between PHP 5 and PHP 7 grammarsparser.template
: Akmyacc
parser prototype file for PHPtokens.template
: Akmyacc
prototype file for theTokens
classrebuildParsers.php
: Preprocesses the grammar and builds the parser usingkmyacc
.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 intonew 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 alternativekmyacc
binary. By default thephpyacc
dev dependency will be used. To use the originalkmyacc
, you need to compile moriyoshi's fork. - The
--debug
option enables emission of debug symbols and creates they.output
file. - The
--keep-tmp-grammar
option preserves the preprocessed grammar file.