29 lines
1.3 KiB
Markdown
29 lines
1.3 KiB
Markdown
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What do all those files mean?
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=============================
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* `php5.y`: PHP 5 grammar written in a pseudo language
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* `php7.y`: PHP 7 grammar written in a pseudo language
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* `tokens.y`: Tokens definition shared between PHP 5 and PHP 7 grammars
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* `parser.template`: A `kmyacc` parser prototype file for PHP
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* `tokens.template`: A `kmyacc` prototype file for the `Tokens` class
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* `rebuildParsers.php`: Preprocesses the grammar and builds the parser using `kmyacc`
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.phpy pseudo language
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=====================
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The `.y` file is a normal grammer in `kmyacc` (`yacc`) style, with some transformations
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applied to it:
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* Nodes are created using the syntax `Name[..., ...]`. This is transformed into
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`new Name(..., ..., attributes())`
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* Some function-like constructs are resolved (see `rebuildParsers.php` for a list)
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Building the parser
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===================
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In order to rebuild the parser, you need [moriyoshi's fork of kmyacc](https://github.com/moriyoshi/kmyacc-forked).
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After you compiled/installed it, run the `rebuildParsers.php` script.
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By default only the `Parser.php` is built. If you want to additionally emit debug symbols and create `y.output`, run the
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script with `--debug`. If you want to retain the preprocessed grammar pass `--keep-tmp-grammar`.
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