forked from joomla/Component-Builder
382 lines
14 KiB
PHP
382 lines
14 KiB
PHP
<?php
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/*--------------------------------------------------------------------------------------------------------| www.vdm.io |------/
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__ __ _ _____ _ _ __ __ _ _ _
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\ \ / / | | | __ \ | | | | | \/ | | | | | | |
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\ \ / /_ _ ___| |_ | | | | _____ _____| | ___ _ __ _ __ ___ ___ _ __ | |_ | \ / | ___| |_| |__ ___ __| |
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\ \/ / _` / __| __| | | | |/ _ \ \ / / _ \ |/ _ \| '_ \| '_ ` _ \ / _ \ '_ \| __| | |\/| |/ _ \ __| '_ \ / _ \ / _` |
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\ / (_| \__ \ |_ | |__| | __/\ V / __/ | (_) | |_) | | | | | | __/ | | | |_ | | | | __/ |_| | | | (_) | (_| |
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\/ \__,_|___/\__| |_____/ \___| \_/ \___|_|\___/| .__/|_| |_| |_|\___|_| |_|\__| |_| |_|\___|\__|_| |_|\___/ \__,_|
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/-------------------------------------------------------------------------------------------------------------------------------/
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@version 2.5.0
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@build 23rd August, 2017
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@created 30th April, 2015
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@package Component Builder
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@subpackage minify.php
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@author Llewellyn van der Merwe <http://vdm.bz/component-builder>
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@copyright Copyright (C) 2015. All Rights Reserved
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@license GNU/GPL Version 2 or later - http://www.gnu.org/licenses/gpl-2.0.html
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Builds Complex Joomla Components
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/-----------------------------------------------------------------------------------------------------------------------------*/
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// No direct access to this file
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defined('_JEXEC') or die('Restricted access');
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/**
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* Abstract minifier class.
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*
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* Please report bugs on https://github.com/matthiasmullie/minify/issues
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*
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* @author Matthias Mullie <minify@mullie.eu>
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*
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* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved.
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* @license MIT License
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*/
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abstract class Minify
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{
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/**
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* The data to be minified
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*
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* @var string[]
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*/
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protected $data = array();
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/**
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* Array of patterns to match.
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*
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* @var string[]
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*/
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protected $patterns = array();
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/**
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* This array will hold content of strings and regular expressions that have
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* been extracted from the JS source code, so we can reliably match "code",
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* without having to worry about potential "code-like" characters inside.
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*
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* @var string[]
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*/
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public $extracted = array();
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/**
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* Init the minify class - optionally, code may be passed along already.
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*/
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public function __construct(/* $data = null, ... */)
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{
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// it's possible to add the source through the constructor as well ;)
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if (func_num_args()) {
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call_user_func_array(array($this, 'add'), func_get_args());
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}
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}
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/**
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* Add a file or straight-up code to be minified.
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*
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* @param string $data
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*/
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public function add($data /* $data = null, ... */)
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{
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// bogus "usage" of parameter $data: scrutinizer warns this variable is
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// not used (we're using func_get_args instead to support overloading),
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// but it still needs to be defined because it makes no sense to have
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// this function without argument :)
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$args = array($data) + func_get_args();
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// this method can be overloaded
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foreach ($args as $data) {
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// redefine var
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$data = (string) $data;
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// load data
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$value = $this->load($data);
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$key = ($data != $value) ? $data : count($this->data);
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// store data
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$this->data[$key] = $value;
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}
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}
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/**
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* Load data.
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*
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* @param string $data Either a path to a file or the content itself.
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* @return string
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*/
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protected function load($data)
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{
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// check if the data is a file
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if (@file_exists($data) && is_file($data)) {
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$data = @file_get_contents($data);
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// strip BOM, if any
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if (substr($data, 0, 3) == "\xef\xbb\xbf") {
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$data = substr($data, 3);
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}
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}
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return $data;
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}
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/**
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* Save to file
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*
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* @param string $content The minified data.
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* @param string $path The path to save the minified data to.
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* @throws Exception
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*/
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protected function save($content, $path)
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{
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// create file & open for writing
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if (($handler = @fopen($path, 'w')) === false) {
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throw new Exception('The file "'.$path.'" could not be opened. Check if PHP has enough permissions.');
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}
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// write to file
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if (@fwrite($handler, $content) === false) {
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throw new Exception('The file "'.$path.'" could not be written to. Check if PHP has enough permissions.');
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}
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// close the file
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@fclose($handler);
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}
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/**
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* Minify the data & (optionally) saves it to a file.
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*
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* @param string[optional] $path Path to write the data to.
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* @return string The minified data.
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*/
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public function minify($path = null)
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{
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$content = $this->execute($path);
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// save to path
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if ($path !== null) {
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$this->save($content, $path);
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}
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return $content;
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}
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/**
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* Minify & gzip the data & (optionally) saves it to a file.
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*
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* @param string[optional] $path Path to write the data to.
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* @param int[optional] $level Compression level, from 0 to 9.
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* @return string The minified & gzipped data.
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*/
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public function gzip($path = null, $level = 9)
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{
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$content = $this->execute($path);
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$content = gzencode($content, $level, FORCE_GZIP);
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// save to path
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if ($path !== null) {
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$this->save($content, $path);
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}
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return $content;
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}
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/**
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* Minify the data.
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*
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* @param string[optional] $path Path to write the data to.
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* @return string The minified data.
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*/
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abstract protected function execute($path = null);
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/**
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* Register a pattern to execute against the source content.
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*
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* @param string $pattern PCRE pattern.
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* @param string|callable $replacement Replacement value for matched pattern.
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* @throws Exception
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*/
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protected function registerPattern($pattern, $replacement = '')
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{
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// study the pattern, we'll execute it more than once
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$pattern .= 'S';
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$this->patterns[] = array($pattern, $replacement);
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}
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/**
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* We can't "just" run some regular expressions against JavaScript: it's a
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* complex language. E.g. having an occurrence of // xyz would be a comment,
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* unless it's used within a string. Of you could have something that looks
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* like a 'string', but inside a comment.
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* The only way to accurately replace these pieces is to traverse the JS one
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* character at a time and try to find whatever starts first.
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*
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* @param string $content The content to replace patterns in.
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* @return string The (manipulated) content.
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*/
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protected function replace($content)
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{
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$processed = '';
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$positions = array_fill(0, count($this->patterns), -1);
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$matches = array();
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while ($content) {
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// find first match for all patterns
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foreach ($this->patterns as $i => $pattern) {
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list($pattern, $replacement) = $pattern;
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// no need to re-run matches that are still in the part of the
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// content that hasn't been processed
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if ($positions[$i] >= 0) {
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continue;
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}
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$match = null;
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if (preg_match($pattern, $content, $match)) {
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$matches[$i] = $match;
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// we'll store the match position as well; that way, we
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// don't have to redo all preg_matches after changing only
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// the first (we'll still know where those others are)
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$positions[$i] = strpos($content, $match[0]);
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} else {
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// if the pattern couldn't be matched, there's no point in
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// executing it again in later runs on this same content;
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// ignore this one until we reach end of content
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unset($matches[$i]);
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$positions[$i] = strlen($content);
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}
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}
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// no more matches to find: everything's been processed, break out
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if (!$matches) {
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$processed .= $content;
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break;
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}
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// see which of the patterns actually found the first thing (we'll
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// only want to execute that one, since we're unsure if what the
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// other found was not inside what the first found)
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$discardLength = min($positions);
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$firstPattern = array_search($discardLength, $positions);
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$match = $matches[$firstPattern][0];
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// execute the pattern that matches earliest in the content string
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list($pattern, $replacement) = $this->patterns[$firstPattern];
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$replacement = $this->replacePattern($pattern, $replacement, $content);
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// figure out which part of the string was unmatched; that's the
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// part we'll execute the patterns on again next
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$content = substr($content, $discardLength);
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$unmatched = (string) substr($content, strpos($content, $match) + strlen($match));
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// move the replaced part to $processed and prepare $content to
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// again match batch of patterns against
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$processed .= substr($replacement, 0, strlen($replacement) - strlen($unmatched));
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$content = $unmatched;
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// first match has been replaced & that content is to be left alone,
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// the next matches will start after this replacement, so we should
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// fix their offsets
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foreach ($positions as $i => $position) {
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$positions[$i] -= $discardLength + strlen($match);
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}
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}
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return $processed;
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}
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/**
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* This is where a pattern is matched against $content and the matches
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* are replaced by their respective value.
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* This function will be called plenty of times, where $content will always
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* move up 1 character.
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*
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* @param string $pattern Pattern to match.
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* @param string|callable $replacement Replacement value.
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* @param string $content Content to match pattern against.
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* @return string
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*/
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protected function replacePattern($pattern, $replacement, $content)
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{
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if (is_callable($replacement)) {
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return preg_replace_callback($pattern, $replacement, $content, 1, $count);
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} else {
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return preg_replace($pattern, $replacement, $content, 1, $count);
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}
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}
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/**
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* Strings are a pattern we need to match, in order to ignore potential
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* code-like content inside them, but we just want all of the string
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* content to remain untouched.
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*
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* This method will replace all string content with simple STRING#
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* placeholder text, so we've rid all strings from characters that may be
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* misinterpreted. Original string content will be saved in $this->extracted
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* and after doing all other minifying, we can restore the original content
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* via restoreStrings()
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*
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* @param string[optional] $chars
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*/
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protected function extractStrings($chars = '\'"')
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{
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// PHP only supports $this inside anonymous functions since 5.4
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$minifier = $this;
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$callback = function ($match) use ($minifier) {
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if (!$match[1]) {
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/*
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* Empty strings need no placeholder; they can't be confused for
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* anything else anyway.
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* But we still needed to match them, for the extraction routine
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* to skip over this particular string.
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*/
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return $match[0];
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}
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$count = count($minifier->extracted);
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$placeholder = $match[1].$count.$match[1];
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$minifier->extracted[$placeholder] = $match[1].$match[2].$match[1];
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return $placeholder;
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};
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/*
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* The \\ messiness explained:
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* * Don't count ' or " as end-of-string if it's escaped (has backslash
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* in front of it)
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* * Unless... that backslash itself is escaped (another leading slash),
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* in which case it's no longer escaping the ' or "
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* * So there can be either no backslash, or an even number
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* * multiply all of that times 4, to account for the escaping that has
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* to be done to pass the backslash into the PHP string without it being
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* considered as escape-char (times 2) and to get it in the regex,
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* escaped (times 2)
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*/
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$this->registerPattern('/(['.$chars.'])(.*?((?<!\\\\)|\\\\\\\\+))\\1/s', $callback);
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}
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/**
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* This method will restore all extracted data (strings, regexes) that were
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* replaced with placeholder text in extract*(). The original content was
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* saved in $this->extracted.
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*
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* @param string $content
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* @return string
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*/
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protected function restoreExtractedData($content)
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{
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if (!$this->extracted) {
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// nothing was extracted, nothing to restore
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return $content;
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}
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$content = strtr($content, $this->extracted);
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$this->extracted = array();
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return $content;
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}
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}
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