tmilos/gold-parser

Golder parser PHP runtime LALR engine and compiled grammar loader

1.0.2 2016-12-21 11:21 UTC

Requires

• php: >=5.6.1
• symfony/event-dispatcher: ^2.0|^3.0
• tmilos/value: ^1.0

Requires (Dev)

• phpunit/phpunit: ~4.8|~5.6
• satooshi/php-coveralls: ~1.0

MIT

• Milos Tomic

• gold parser
• LALR parser
• compiled grammar

README

Gold parser PHP runtime LALR engine and compiled grammar loader. For more information check Gold Parser website. Library is written based on the Calitha C# GOLD Parser Engine.

Installation

You can use Composer to install

$ composer require tmilos/gold-parser

Usage

Use Loader class to load compiled grammar file, and it's createNewParser() to get the LALR parser for that grammar.

<?php
$parser = Loader::fromFile('grammar.cgt')->createNewParser();
$nonTerminal = $parser->parse($inputString);
$parser->isAccepted(); // true

Events

The Parser instance has a default event listener, which you could replace. During parsing it dispatches various events. In the Events class are enumerated all events that are dispatched.

Errors

By default the parser adds error listeners that will throw exceptions when error events are dispatched. You can add your own listeners for the error events and disable those default listeners with Parser::setThrowExceptionsOnErrors(false)

Default error handlers will throw ParseException on PARSE_ERROR event, and TokenException on TOKEN_ERROR event.

Performance

On my modest laptop with PHP 7.0 it takes around 0.2 seconds to load grammar and create parser, and around 0.04 seconds to parse ~700 chars json. Feel free to contribute and improve performance. Think the loading is critical.