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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 grammar 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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Run `php grammar/rebuildParsers.php` to rebuild the parsers. Additional options:
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* The `KMYACC` environment variable can be used to specify an alternative `kmyacc` binary.
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By default the `phpyacc` dev dependency will be used. To use the original `kmyacc`, you
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need to compile [moriyoshi's fork](https://github.com/moriyoshi/kmyacc-forked).
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* The `--debug` option enables emission of debug symbols and creates the `y.output` file.
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* The `--keep-tmp-grammar` option preserves the preprocessed grammar file.
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