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e16513a0eb
php-parser/grammar
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nikic e16513a0eb Fix parsing of new expressions in parenthesis 
The new dereferencing syntaxes (new Foo)->bar and (new Foo)['bar'] were
causing a shift/reduce conflict with the '(' expr ')' rule. When
(new Foo) was encountered (without dereference operators following) the
parser thus threw a parse error.

The fix simply adds a special '(' new_expr ')' rule to expr. This does not
remove the shift/reduce conflict itself, but makes it irrelevant.

This fixes issue #20.
2012-05-12 14:11:10 +02:00
..
analyze.php Remove node analysis from analyze.php and fix some other things about it 2011-08-14 15:52:57 +02:00
kmyacc.php.parser Generalize the attribute generation for nodes 2012-05-05 17:34:27 +02:00
README.md Store line and doc comment as attributes 2012-05-04 10:16:59 +02:00
rebuildParser.php Store line and doc comment as attributes 2012-05-04 10:16:59 +02:00
zend_language_parser.phpy Fix parsing of new expressions in parenthesis 2012-05-12 14:11:10 +02:00

README.md

What do all those files mean?

  • zend_language_parser.y: Original PHP grammer this parser is based on
  • zend_language_parser.phpy: PHP grammer written in a pseudo language
  • analyze.php: Analyzes the .phpy-grammer and outputs some info about it
  • rebuildParser.php: Preprocesses the .phpy-grammar and builds the parser using kmyacc
  • kmyacc.php.parser: A kmyacc parser prototype file for PHP

.phpy pseudo language

The .phpy 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 PHPParser_Node_Name(..., ..., $attributes)
  • Name::abc is transformed to PHPParser_Node_Name::abc
  • Some function-like constructs are resolved (see rebuildParser.php for a list)
  • Associative arrays are written as [key: value, ...], which is transformed to array('key' => value, ...)

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 file.

By default only the Parser.php is built. If you want to build the Parser/Debug.php and the y.output file you need to call the file with the debug option: rebuildParser.php?debug.