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[Parsing & Serialization](/categories/parsing) 4. / 5. axmachado/pacc ActivePackage[Parsing & Serialization](/categories/parsing) axmachado/pacc ============== Parser generator (currently generates recursive descent parser and canonical LR(1) parser) for PHP. 0.2.1(8y ago)714.9k[3 issues](https://github.com/axmachado/pacc/issues)MITPHPPHP >= 5.2.0 Since Aug 4Pushed 8y ago1 watchersCompare [ Source](https://github.com/axmachado/pacc)[ Packagist](https://packagist.org/packages/axmachado/pacc)[ Docs](https://github.com/axmachado/pacc)[ RSS](/packages/axmachado-pacc/feed)WikiDiscussions master Synced 4w ago READMEChangelogDependenciesVersions (6)Used By (0) pacc – PHP yACC =============== [](#pacc--php-yacc) Parser generator (currently generates recursive descent parser and canonical LR(1) parser) for PHP. Big refactoring from Jakub Kulhan's original pacc. Get ready --------- [](#get-ready) add the `axmachado/pacc` as a *development requirement*: ``` php composer.phar require axmachado/pacc ``` There is executable `bin/pacc`, that is installed by Composer as `vendor/bin/pacc`. Then, you can run the "pacc" command from your project directory: ``` ./vendor/bin/pacc -h ``` Write parsers ------------- [](#write-parsers) Files consumed by `pacc` are structured like this: ``` grammar ; option = ; @ { } ``` Rules are compiled into PHP parser code, header and footer are left as they are. `pacc` uses YACC/Bison syntax for rules. Each rule constist of its name, `:`, body, and `;`. Name has to match regular expression `[a-z][a-z_]*`. Body consists of expressions separated by vertical bar – `|`. Each expression can have some attached PHP code. For example: ``` numerical_operation : number '+' number { $$ = $1 + $3; /* $1 is first number, $2 is plus sign, and $3 is second number */ } | number '-' number { $$ = $1 - $3; } ; ``` In PHP code, you can use special variables like `$$`, `$1`, `$2`, `$3`, etc. In `$$` is saved result of expression. Through numerical variables you get result of subexpressions. Look for inspiration in `examples/` directory. License ------- [](#license) The MIT license ``` Copyright (c) 2009-2010 Jakub Kulhan Copyright (c) 2017 Alexandre Machado Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ``` ### Health Score 28 — LowBetter than 52% of packages Maintenance11 Infrequent updates — may be unmaintained Popularity27 Limited adoption so far Community10 Small or concentrated contributor base Maturity52 Maturing project, gaining track record Bus Factor1 Top contributor holds 56.8% of commits — single point of failure How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window. **Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores. **Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. Measures real ecosystem engagement. **Maturity (30%)** — Project age, version count, PHP version support, and release stability. ### Release Activity Cadence Every ~18 days Total 4 Last Release 3196d ago ### Community Maintainers ![](https://www.gravatar.com/avatar/135b75c845fa21062f21ed9e3c8bb26e052bd8bc44573a770c1c950d1f7129ad?d=identicon)[axmachado](/maintainers/axmachado) --- Top Contributors [![axmachado](https://avatars.githubusercontent.com/u/1927177?v=4)](https://github.com/axmachado "axmachado (21 commits)")[![jakubkulhan](https://avatars.githubusercontent.com/u/95001?v=4)](https://github.com/jakubkulhan "jakubkulhan (15 commits)")[![bohdankolecek](https://avatars.githubusercontent.com/u/7396096?v=4)](https://github.com/bohdankolecek "bohdankolecek (1 commits)") ### Embed Badge ![Health badge](/badges/axmachado-pacc/health.svg) ``` [![Health](https://phpackages.com/badges/axmachado-pacc/health.svg)](https://phpackages.com/packages/axmachado-pacc) ``` ### Alternatives [mck89/peast Peast is PHP library that generates AST for JavaScript code 19037.7M41](/packages/mck89-peast)[sauladam/shipment-tracker Parses tracking information for several carriers, like UPS, USPS, DHL and GLS by simply scraping the data. 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