<?php /*--------------------------------------------------------------------------------------------------------| www.vdm.io |------/ __ __ _ _____ _ _ __ __ _ _ _ \ \ / / | | | __ \ | | | | | \/ | | | | | | | \ \ / /_ _ ___| |_ | | | | _____ _____| | ___ _ __ _ __ ___ ___ _ __ | |_ | \ / | ___| |_| |__ ___ __| | \ \/ / _` / __| __| | | | |/ _ \ \ / / _ \ |/ _ \| '_ \| '_ ` _ \ / _ \ '_ \| __| | |\/| |/ _ \ __| '_ \ / _ \ / _` | \ / (_| \__ \ |_ | |__| | __/\ V / __/ | (_) | |_) | | | | | | __/ | | | |_ | | | | __/ |_| | | | (_) | (_| | \/ \__,_|___/\__| |_____/ \___| \_/ \___|_|\___/| .__/|_| |_| |_|\___|_| |_|\__| |_| |_|\___|\__|_| |_|\___/ \__,_| | | |_| /-------------------------------------------------------------------------------------------------------------------------------/ @version 2.5.8 @build 18th October, 2017 @created 30th April, 2015 @package Component Builder @subpackage minify.php @author Llewellyn van der Merwe <http://vdm.bz/component-builder> @copyright Copyright (C) 2015. All Rights Reserved @license GNU/GPL Version 2 or later - http://www.gnu.org/licenses/gpl-2.0.html Builds Complex Joomla Components /-----------------------------------------------------------------------------------------------------------------------------*/ // No direct access to this file defined('_JEXEC') or die('Restricted access'); /** * Abstract minifier class. * * Please report bugs on https://github.com/matthiasmullie/minify/issues * * @author Matthias Mullie <minify@mullie.eu> * * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved. * @license MIT License */ abstract class Minify { /** * The data to be minified * * @var string[] */ protected $data = array(); /** * Array of patterns to match. * * @var string[] */ protected $patterns = array(); /** * This array will hold content of strings and regular expressions that have * been extracted from the JS source code, so we can reliably match "code", * without having to worry about potential "code-like" characters inside. * * @var string[] */ public $extracted = array(); /** * Init the minify class - optionally, code may be passed along already. */ public function __construct(/* $data = null, ... */) { // it's possible to add the source through the constructor as well ;) if (func_num_args()) { call_user_func_array(array($this, 'add'), func_get_args()); } } /** * Add a file or straight-up code to be minified. * * @param string $data */ public function add($data /* $data = null, ... */) { // bogus "usage" of parameter $data: scrutinizer warns this variable is // not used (we're using func_get_args instead to support overloading), // but it still needs to be defined because it makes no sense to have // this function without argument :) $args = array($data) + func_get_args(); // this method can be overloaded foreach ($args as $data) { // redefine var $data = (string) $data; // load data $value = $this->load($data); $key = ($data != $value) ? $data : count($this->data); // store data $this->data[$key] = $value; } } /** * Load data. * * @param string $data Either a path to a file or the content itself. * @return string */ protected function load($data) { // check if the data is a file if (@file_exists($data) && is_file($data)) { $data = @file_get_contents($data); // strip BOM, if any if (substr($data, 0, 3) == "\xef\xbb\xbf") { $data = substr($data, 3); } } return $data; } /** * Save to file * * @param string $content The minified data. * @param string $path The path to save the minified data to. * @throws Exception */ protected function save($content, $path) { // create file & open for writing if (($handler = @fopen($path, 'w')) === false) { throw new Exception('The file "'.$path.'" could not be opened. Check if PHP has enough permissions.'); } // write to file if (@fwrite($handler, $content) === false) { throw new Exception('The file "'.$path.'" could not be written to. Check if PHP has enough permissions.'); } // close the file @fclose($handler); } /** * Minify the data & (optionally) saves it to a file. * * @param string[optional] $path Path to write the data to. * @return string The minified data. */ public function minify($path = null) { $content = $this->execute($path); // save to path if ($path !== null) { $this->save($content, $path); } return $content; } /** * Minify & gzip the data & (optionally) saves it to a file. * * @param string[optional] $path Path to write the data to. * @param int[optional] $level Compression level, from 0 to 9. * @return string The minified & gzipped data. */ public function gzip($path = null, $level = 9) { $content = $this->execute($path); $content = gzencode($content, $level, FORCE_GZIP); // save to path if ($path !== null) { $this->save($content, $path); } return $content; } /** * Minify the data. * * @param string[optional] $path Path to write the data to. * @return string The minified data. */ abstract protected function execute($path = null); /** * Register a pattern to execute against the source content. * * @param string $pattern PCRE pattern. * @param string|callable $replacement Replacement value for matched pattern. * @throws Exception */ protected function registerPattern($pattern, $replacement = '') { // study the pattern, we'll execute it more than once $pattern .= 'S'; $this->patterns[] = array($pattern, $replacement); } /** * We can't "just" run some regular expressions against JavaScript: it's a * complex language. E.g. having an occurrence of // xyz would be a comment, * unless it's used within a string. Of you could have something that looks * like a 'string', but inside a comment. * The only way to accurately replace these pieces is to traverse the JS one * character at a time and try to find whatever starts first. * * @param string $content The content to replace patterns in. * @return string The (manipulated) content. */ protected function replace($content) { $processed = ''; $positions = array_fill(0, count($this->patterns), -1); $matches = array(); while ($content) { // find first match for all patterns foreach ($this->patterns as $i => $pattern) { list($pattern, $replacement) = $pattern; // no need to re-run matches that are still in the part of the // content that hasn't been processed if ($positions[$i] >= 0) { continue; } $match = null; if (preg_match($pattern, $content, $match)) { $matches[$i] = $match; // we'll store the match position as well; that way, we // don't have to redo all preg_matches after changing only // the first (we'll still know where those others are) $positions[$i] = strpos($content, $match[0]); } else { // if the pattern couldn't be matched, there's no point in // executing it again in later runs on this same content; // ignore this one until we reach end of content unset($matches[$i]); $positions[$i] = strlen($content); } } // no more matches to find: everything's been processed, break out if (!$matches) { $processed .= $content; break; } // see which of the patterns actually found the first thing (we'll // only want to execute that one, since we're unsure if what the // other found was not inside what the first found) $discardLength = min($positions); $firstPattern = array_search($discardLength, $positions); $match = $matches[$firstPattern][0]; // execute the pattern that matches earliest in the content string list($pattern, $replacement) = $this->patterns[$firstPattern]; $replacement = $this->replacePattern($pattern, $replacement, $content); // figure out which part of the string was unmatched; that's the // part we'll execute the patterns on again next $content = substr($content, $discardLength); $unmatched = (string) substr($content, strpos($content, $match) + strlen($match)); // move the replaced part to $processed and prepare $content to // again match batch of patterns against $processed .= substr($replacement, 0, strlen($replacement) - strlen($unmatched)); $content = $unmatched; // first match has been replaced & that content is to be left alone, // the next matches will start after this replacement, so we should // fix their offsets foreach ($positions as $i => $position) { $positions[$i] -= $discardLength + strlen($match); } } return $processed; } /** * This is where a pattern is matched against $content and the matches * are replaced by their respective value. * This function will be called plenty of times, where $content will always * move up 1 character. * * @param string $pattern Pattern to match. * @param string|callable $replacement Replacement value. * @param string $content Content to match pattern against. * @return string */ protected function replacePattern($pattern, $replacement, $content) { if (is_callable($replacement)) { return preg_replace_callback($pattern, $replacement, $content, 1, $count); } else { return preg_replace($pattern, $replacement, $content, 1, $count); } } /** * Strings are a pattern we need to match, in order to ignore potential * code-like content inside them, but we just want all of the string * content to remain untouched. * * This method will replace all string content with simple STRING# * placeholder text, so we've rid all strings from characters that may be * misinterpreted. Original string content will be saved in $this->extracted * and after doing all other minifying, we can restore the original content * via restoreStrings() * * @param string[optional] $chars */ protected function extractStrings($chars = '\'"') { // PHP only supports $this inside anonymous functions since 5.4 $minifier = $this; $callback = function ($match) use ($minifier) { if (!$match[1]) { /* * Empty strings need no placeholder; they can't be confused for * anything else anyway. * But we still needed to match them, for the extraction routine * to skip over this particular string. */ return $match[0]; } $count = count($minifier->extracted); $placeholder = $match[1].$count.$match[1]; $minifier->extracted[$placeholder] = $match[1].$match[2].$match[1]; return $placeholder; }; /* * The \\ messiness explained: * * Don't count ' or " as end-of-string if it's escaped (has backslash * in front of it) * * Unless... that backslash itself is escaped (another leading slash), * in which case it's no longer escaping the ' or " * * So there can be either no backslash, or an even number * * multiply all of that times 4, to account for the escaping that has * to be done to pass the backslash into the PHP string without it being * considered as escape-char (times 2) and to get it in the regex, * escaped (times 2) */ $this->registerPattern('/(['.$chars.'])(.*?((?<!\\\\)|\\\\\\\\+))\\1/s', $callback); } /** * This method will restore all extracted data (strings, regexes) that were * replaced with placeholder text in extract*(). The original content was * saved in $this->extracted. * * @param string $content * @return string */ protected function restoreExtractedData($content) { if (!$this->extracted) { // nothing was extracted, nothing to restore return $content; } $content = strtr($content, $this->extracted); $this->extracted = array(); return $content; } }