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| author | Chris Cannam |
|---|---|
| date | Wed, 28 Aug 2019 13:14:47 +0100 |
| parents | 5fb285c0d0e3 |
| children |
| rev | line source |
|---|---|
| Chris@0 | 1 What do all those files mean? |
| Chris@0 | 2 ============================= |
| Chris@0 | 3 |
| Chris@0 | 4 * `php5.y`: PHP 5 grammar written in a pseudo language |
| Chris@0 | 5 * `php7.y`: PHP 7 grammar written in a pseudo language |
| Chris@0 | 6 * `tokens.y`: Tokens definition shared between PHP 5 and PHP 7 grammars |
| Chris@0 | 7 * `parser.template`: A `kmyacc` parser prototype file for PHP |
| Chris@0 | 8 * `tokens.template`: A `kmyacc` prototype file for the `Tokens` class |
| Chris@0 | 9 * `rebuildParsers.php`: Preprocesses the grammar and builds the parser using `kmyacc` |
| Chris@0 | 10 |
| Chris@0 | 11 .phpy pseudo language |
| Chris@0 | 12 ===================== |
| Chris@0 | 13 |
| Chris@13 | 14 The `.y` file is a normal grammar in `kmyacc` (`yacc`) style, with some transformations |
| Chris@0 | 15 applied to it: |
| Chris@0 | 16 |
| Chris@0 | 17 * Nodes are created using the syntax `Name[..., ...]`. This is transformed into |
| Chris@0 | 18 `new Name(..., ..., attributes())` |
| Chris@0 | 19 * Some function-like constructs are resolved (see `rebuildParsers.php` for a list) |
| Chris@0 | 20 |
| Chris@0 | 21 Building the parser |
| Chris@0 | 22 =================== |
| Chris@0 | 23 |
| Chris@0 | 24 In order to rebuild the parser, you need [moriyoshi's fork of kmyacc](https://github.com/moriyoshi/kmyacc-forked). |
| Chris@0 | 25 After you compiled/installed it, run the `rebuildParsers.php` script. |
| Chris@0 | 26 |
| Chris@0 | 27 By default only the `Parser.php` is built. If you want to additionally emit debug symbols and create `y.output`, run the |
| Chris@0 | 28 script with `--debug`. If you want to retain the preprocessed grammar pass `--keep-tmp-grammar`. |