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PHP-Parser/grammar
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Nikita Popov 60d025a914 Fix attributes for zero-length nop nodes 
Previously zero-length nop nodes used the lookahead start attributes
and current end attributes. This choice ends up being somewhat weird,
because the end attributes will be the at the last non-whitespace,
non-comment token, which might be quite far back. More problematically,
we may not have encountered any non-discarded token if we're at the
start of the file, in which case we will have no end attributes to
assign.

Change things to use a canonical "zero-length" node representation,
where the end position (token & file) will be exactly one before the
start position.

Fixes #589.
2019-05-11 20:01:25 +02:00
..
parser.template Rename YYNLSTATES to numNonLeafStates 2017-11-12 16:09:00 +01:00
php5.y Fix attributes for zero-length nop nodes 2019-05-11 20:01:25 +02:00
php7.y Fix attributes for zero-length nop nodes 2019-05-11 20:01:25 +02:00
README.md Fix spelling in documentation (#434) 2017-10-31 22:47:42 +01:00
rebuildParsers.php Fix attributes for zero-length nop nodes 2019-05-11 20:01:25 +02:00
tokens.template Move token constants into separate class 2015-06-13 18:39:55 +02:00
tokens.y [PHP 7.4] Add support for arrow functions (#602) 2019-05-09 14:17:28 +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

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.