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History

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.