Pelzini

source of /processor/javascript_parser.php

Contains the JavascriptParser class

<?php
/*
Copyright 2008 Josh Heidenreich
 
This file is part of Pelzini.
 
Pelzini is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
 
Pelzini is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with Pelzini.  If not, see <http://www.gnu.org/licenses/>.
*/
 
 
/**
 * Contains the {@link JavascriptParser} class
 *
 * @package Parsers
 * @author Josh
 * @since 0.2
 **/
 
/**
 * Does the complete parsing of a javascript file.
 **/
class JavascriptParser
{
    private $lexer;
    private $analyser;
 
    public function __construct()
    {
        $this->lexer = new JavascriptLexer();
        $this->analyser = new JavascriptAnalyser();
    }
 
 
    /**
     * Parses a file
     *
     * @param string $filename The file to parse
     * @return A ParserFile object, or null if there was an error
     **/
    public function parseFile($base_dir, $filename)
    {
        $this->lexer->resetState();
        $this->analyser->resetState();
 
        $source = @file_get_contents($base_dir . $filename);
        if ($source == null) return null;
 
		// Simple "minified" detection
		// These don't have useful comments, and sometimes crash the parser as well
		$num_lines = substr_count($source, "\n") + 1;
		$num_chars = strlen($source);
		$avg_line_length = $num_chars / $num_lines;
		if ($avg_line_length > 200) {
			return null;
		}
 
        $tokens = $this->lexer->process($source);
        if ($tokens === null) return null;
 
        //echo "<style>i {color: #777;}</style>";
        //echo '<pre>Tokens for file ', $filename, "\n";
        //foreach ($tokens as $i => $t) echo "<b>{$i}</b> {$t->getTypeName()} <i>{$t->getValue()}</i>\n";
        //echo '</pre>';
 
        $file = new ParserFile();
        $file->name = $filename;
        $file->source = $source;
 
        $result = $this->analyser->process($tokens, $file);
        if ($result === false) return null;
 
        return $file;
    }
 
 
}
 
 
?>