768 lines
24 KiB
PHP
768 lines
24 KiB
PHP
<?php
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/* --------------------------------------------------------------------
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G\ library
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https://g.chevereto.com
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@author Rodolfo Berrios A. <http://rodolfoberrios.com/>
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Copyright (c) Rodolfo Berrios <inbox@rodolfoberrios.com> All rights reserved.
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Licensed under the MIT license
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http://opensource.org/licenses/MIT
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--------------------------------------------------------------------- */
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/**
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* This class uses code that belongs to JShrink
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* @JShrink author Robert Hafner <tedivm@tedivm.com>
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* @JShrink license http://www.opensource.org/licenses/bsd-license.php BSD License
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*/
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/**
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* class.minify.php
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* This class minify a js/css file.
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* It reads a file and saves the minify version to a given target (default target is souce.min.ext)
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*/
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namespace G;
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use Exception;
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class Minify {
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protected static $default_options = ['forced' => false, 'source_method' => 'file', 'output' => 'file'];
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protected static $JShrink_defaultOptions = ['flaggedComments' => false];
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protected $locks = [];
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function __construct($options=[]) {
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$this->options = array_merge(static::$default_options, (array)$options);
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if($this->options['source']) {
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$addFn = $this->options['source_method'] == 'file' ? 'addFileSource' : 'addInlineSource';
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if($addFn == 'addInlineSource') {
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if(!isset($this->options['source_type'])) {
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unset($addFn);
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} else {
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$this->setType($this->options['source_type']);
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}
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}
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if($addFn) {
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$this->$addFn($this->options['source']);
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}
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}
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if($this->options['forced']) {
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$this->setForced();
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}
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}
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/**
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* addFileSource
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* Sets the filepath to be minified and gets the contents
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*
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* @param $source filepath
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*/
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public function addFileSource($source) {
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$this->source = $source;
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if(!@is_readable($this->source)) {
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throw new MinifyException('Source file "'. $this->source .'" can\'t be loaded. Make sure that the file exists on the given path.', 101);
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}
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$type = preg_replace('/^.*\.(css|js)$/i', '$1', $source);
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$this->setType($type);
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$this->source_method = 'file';
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$this->data = $this->getSourceData();
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}
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/**
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* addInlineSource
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* Sets the contents from inline
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*
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* @param string containing raw code
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*/
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public function addInlineSource($source) {
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if(strlen($source) == 0) {
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throw new MinifyException('Source code is empty.', 102);
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}
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$this->source = $source;
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$this->source_method = 'inline';
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$this->data = $source;
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}
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/**
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* setForced
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* Set forced = TRUE to minify even if the target already exists
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*/
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public function setForced() {
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$this->forced = true;
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}
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/**
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* setType
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* Set type of the rource to minify
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*
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* @param js|css
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*/
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public function setType($type) {
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if(!in_array($type, ['js', 'css'])) {
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throw new MinifyException('Invalid type. This only works with JS and CSS.', 103);
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}
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$this->type = $type;
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}
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/**
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* setFileTarget
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* Sets the file target where you want to save the minified file
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*/
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public function setFileTarget($target=NULL) {
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$this->options['output'] = 'file';
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$this->target = ($target == NULL ? $this->getDefaultTarget() : $target);
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}
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/**
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* exec
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* Execute the minification process
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*/
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public function exec() {
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if(!isset($this->source)) {
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throw new MinifyException('There is no source defined. Use the class constructor or ->addFileSource(\'/source-dir/source.file\') or ->addInlineSource() to add a source to be minified.');
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}
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if(!isset($this->options)) {
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$this->options = static::$default_options;
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}
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// Process default target
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if(!$this->target and $this->options['output'] == 'file') {
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$this->setFileTarget(); // Target sets only for file output
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}
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if($this->target) {
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// Detect write support
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if(!@is_writable(dirname($this->target))) {
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throw new MinifyException("Can't write into target dir.", 200);
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}
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// Target already exists?
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if(@is_readable($this->target) and !$this->forced) {
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$source_mtime = filemtime($this->source);
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$target_mtime = filemtime($this->target);
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if($source_mtime and $target_mtime and $target_mtime > $source_mtime) {
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$this->result = $this->target;
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return;
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}
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}
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}
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$fn = 'minify' . strtoupper($this->type);
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$this->$fn();
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if($this->options['output'] == 'file') {
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$this->saveToFile();
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$this->result = $this->target;
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unset($this->minified_data); // Save memory
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} else {
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$this->result = $this->minified_data;
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}
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unset($this->data); // Save memory
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}
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/**
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* getSourceData
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* Grabs the file data using file_get_contents
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*
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* @return: string
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*/
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private function getSourceData() {
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$data = @file_get_contents($this->source);
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if($data === false) {
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throw new MinifyException('Can\'t read the contents of the source file.', 100);
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} else {
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return $data;
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}
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}
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/**
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* minifyCSS
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* Sets the minified data for CSS
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*/
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private function minifyCSS() {
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$this->setMinifiedData($this->getMinifiedData());
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}
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/**
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* minifyJS
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* Sets the minified data for JavaScript
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*/
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private function minifyJS() {
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$data = $this->JShrink($this->data);
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$this->setMinifiedData($data);
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}
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/**
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* getDefaultTarget
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* Set the default file.min.ext from $this->source
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*
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* @return: string
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*/
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private function getDefaultTarget() {
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return preg_replace('/(.*)\.([a-z]{2,3})$/i', '$1.min.$2', $this->source);
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}
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/**
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* getMinifiedData
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* Returns the minified $this->data
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*
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* @return: string
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*/
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private function getMinifiedData() {
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return $this->stripWhitespaces($this->stripLinebreaks($this->stripComments($this->data)));
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}
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/**
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* setMinifiedData
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* Sets $this->minified_data and unset the $this->data
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*/
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private function setMinifiedData($string) {
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$this->minified_data = $string;
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unset($this->data);
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}
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/**
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* saveToFile
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* Saves the minified data to the target file
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*/
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private function saveToFile() {
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if(!isset($this->minified_data)) {
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throw new MinifyException('There is no data to write to "'.$this->target.'"', 300);
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}
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if(($handler = @fopen($this->target, 'w')) === false) {
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throw new MinifyException('Can\'t open "' . $this->target . '" for writing.', 301);
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}
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if(!fwrite($handler, $this->minified_data)) {
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throw new MinifyException('The file "' . $path . '" could not be written to. Check if PHP has enough permissions.', 303);
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}
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if($this->source_method == 'file') {
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$minify_mtime = filemtime($this->target);
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if($minify_mtime) {
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@touch($this->source, $minify_mtime - 1); // Make sure to touch the source file to avoid filemtime issues
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}
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}
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fclose($handler);
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}
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/**
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* stripWhitespaces
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* Removes any whitespace inside/betwen ;:{}[] chars. It also safely removes the extra space inside () parentheses
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*
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* @param: string
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*/
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private function stripWhitespaces($string) {
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switch($this->type) {
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case 'css':
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$pattern = ';|:|,|\{|\}';
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break;
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case 'js': // Just for legacy concerns
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$pattern = ';|:|,|\{|\}|\[|\]';
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break;
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}
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return preg_replace('/\s*('.$pattern.')\s*/', '$1', preg_replace('/\(\s*(.*)\s*\)/', '($1)', $string));
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}
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/**
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* stripLinebreaks
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* Removes any line break in the form of newline, carriage return, tab and extra spaces
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*
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* @param: string
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*/
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private function stripLinebreaks($string) {
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return preg_replace('#(\\\?[\n\r\t]+|\s{2,})#', '', $string);
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}
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/**
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* stripComments
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* Removes all the known comment types from the source
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*
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* @param: string
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*/
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private function stripComments($string) {
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$protected = '(?<![\\\/\'":])';
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$multiline = '\/\*[\s\S]*?\*\/'; // /* comment */
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// The pattern
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$pattern = $protected;
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switch($this->type) {
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case 'css':
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$pattern .= $multiline;
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break;
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case 'js': // Just for legacy concerns
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$pattern .= '(' . $multiline . '|' . $ctype . ')';
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break;
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}
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return preg_replace('#'.$pattern.'#', NULL, $string);
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}
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/* Now the JShrink components */
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/**
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* Takes a string containing javascript and removes unneeded characters in
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* order to shrink the code without altering it's functionality.
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*
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* @param string $js The raw javascript to be minified
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* @param array $options Various runtime options in an associative array
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* @throws Exception
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* @return bool|string
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*/
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private function JShrink($js, $options = []) {
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try {
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ob_start();
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$js = $this->lock($js);
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$this->minifyDirectToOutput($js, $options);
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// Sometimes there's a leading new line, so we trim that out here.
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$js = ltrim(ob_get_clean());
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//$js = str_replace("\n", NULL, $js);
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$js = $this->unlock($js);
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return $js;
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} catch (Exception $e) {
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if (isset($this)) {
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// Since the breakdownScript function probably wasn't finished
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// we clean it out before discarding it.
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$this->clean();
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}
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// without this call things get weird, with partially outputted js.
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ob_end_clean();
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throw $e;
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}
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}
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/**
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* Processes a javascript string and outputs only the required characters,
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* stripping out all unneeded characters.
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*
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* @param string $js The raw javascript to be minified
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* @param array $options Various runtime options in an associative array
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*/
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protected function minifyDirectToOutput($js, $options) {
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$this->initialize($js, $options);
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$this->loop();
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$this->clean();
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}
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/**
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* Initializes internal variables, normalizes new lines,
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*
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* @param string $js The raw javascript to be minified
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* @param array $options Various runtime options in an associative array
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*/
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protected function initialize($js, $options) {
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$this->jsh_options = array_merge(static::$JShrink_defaultOptions, $options);
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$js = str_replace("\r\n", "\n", $js);
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$js = str_replace('/**/', '', $js);
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$this->input = str_replace("\r", "\n", $js);
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// We add a newline to the end of the script to make it easier to deal
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// with comments at the bottom of the script- this prevents the unclosed
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// comment error that can otherwise occur.
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$this->input .= PHP_EOL;
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// Populate "a" with a new line, "b" with the first character, before
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// entering the loop
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$this->a = "\n";
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$this->b = $this->getReal();
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}
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/**
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* The primary action occurs here. This function loops through the input string,
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* outputting anything that's relevant and discarding anything that is not.
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*/
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protected function loop() {
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while ($this->a !== false && !is_null($this->a) && $this->a !== '') {
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switch ($this->a) {
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// new lines
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case "\n":
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// if the next line is something that can't stand alone preserve the newline
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if (strpos('(-+{[@', $this->b) !== false) {
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echo $this->a;
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$this->saveString();
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break;
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}
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// if B is a space we skip the rest of the switch block and go down to the
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// string/regex check below, resetting $this->b with getReal
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if($this->b === ' ')
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break;
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// otherwise we treat the newline like a space
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case ' ':
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if(static::isAlphaNumeric($this->b))
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echo $this->a;
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$this->saveString();
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break;
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default:
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switch ($this->b) {
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case "\n":
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if (strpos('}])+-"\'', $this->a) !== false) {
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echo $this->a;
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$this->saveString();
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break;
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} else {
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if (static::isAlphaNumeric($this->a)) {
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echo $this->a;
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$this->saveString();
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}
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}
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break;
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case ' ':
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if(!static::isAlphaNumeric($this->a))
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break;
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default:
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// check for some regex that breaks stuff
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if ($this->a == '/' && ($this->b == '\'' || $this->b == '"')) {
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$this->saveRegex();
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break;
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}
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echo $this->a;
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$this->saveString();
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break;
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}
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}
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// do reg check of doom
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$this->b = $this->getReal();
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if(($this->b == '/' && strpos('(,=:[!&|?', $this->a) !== false))
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$this->saveRegex();
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}
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}
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/**
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* Resets attributes that do not need to be stored between requests so that
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* the next request is ready to go. Another reason for this is to make sure
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* the variables are cleared and are not taking up memory.
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*/
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protected function clean() {
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unset($this->input);
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$this->index = 0;
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$this->a = $this->b = '';
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unset($this->c);
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//unset($this->options);
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}
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/**
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* Returns the next string for processing based off of the current index.
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*
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* @return string
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*/
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protected function getChar() {
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// Check to see if we had anything in the look ahead buffer and use that.
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if (isset($this->c)) {
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$char = $this->c;
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unset($this->c);
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// Otherwise we start pulling from the input.
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} else {
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$char = substr($this->input, $this->index, 1);
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// If the next character doesn't exist return false.
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if (isset($char) && $char === false) {
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return false;
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}
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// Otherwise increment the pointer and use this char.
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$this->index++;
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}
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// Normalize all whitespace except for the newline character into a
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// standard space.
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if($char !== "\n" && ord($char) < 32) {
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return ' ';
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}
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return $char;
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}
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/**
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* This function gets the next "real" character. It is essentially a wrapper
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* around the getChar function that skips comments. This has significant
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* performance benefits as the skipping is done using native functions (ie,
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* c code) rather than in script php.
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*
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*
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* @return string Next 'real' character to be processed.
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* @throws \RuntimeException
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*/
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protected function getReal() {
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$startIndex = $this->index;
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$char = $this->getChar();
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// Check to see if we're potentially in a comment
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if ($char !== '/') {
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return $char;
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}
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$this->c = $this->getChar();
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if ($this->c == '/') {
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return $this->processOneLineComments($startIndex);
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} elseif ($this->c == '*') {
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return $this->processMultiLineComments($startIndex);
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}
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return $char;
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}
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/**
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* Removed one line comments, with the exception of some very specific types of
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* conditional comments.
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*
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* @param int $startIndex The index point where "getReal" function started
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* @return string
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*/
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protected function processOneLineComments($startIndex) {
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$thirdCommentString = substr($this->input, $this->index, 1);
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// kill rest of line
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$this->getNext("\n");
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if ($thirdCommentString == '@') {
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$endPoint = ($this->index) - $startIndex;
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unset($this->c);
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$char = "\n" . substr($this->input, $startIndex, $endPoint);
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} else {
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// first one is contents of $this->c
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$this->getChar();
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$char = $this->getChar();
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}
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return $char;
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}
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/**
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* Skips multiline comments where appropriate, and includes them where needed.
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* Conditional comments and "license" style blocks are preserved.
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*
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* @param int $startIndex The index point where "getReal" function started
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* @return bool|string False if there's no character
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* @throws \RuntimeException Unclosed comments will throw an error
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*/
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protected function processMultiLineComments($startIndex) {
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$this->getChar(); // current C
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$thirdCommentString = $this->getChar();
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// kill everything up to the next */ if it's there
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if ($this->getNext('*/')) {
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$this->getChar(); // get *
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$this->getChar(); // get /
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$char = $this->getChar(); // get next real character
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|
|
// Now we reinsert conditional comments and YUI-style licensing comments
|
|
if (($this->options['flaggedComments'] && $thirdCommentString == '!')
|
|
|| ($thirdCommentString == '@') ) {
|
|
|
|
// If conditional comments or flagged comments are not the first thing in the script
|
|
// we need to echo a and fill it with a space before moving on.
|
|
if ($startIndex > 0) {
|
|
echo $this->a;
|
|
$this->a = " ";
|
|
|
|
// If the comment started on a new line we let it stay on the new line
|
|
if ($this->input[($startIndex - 1)] == "\n") {
|
|
echo "\n";
|
|
}
|
|
}
|
|
|
|
$endPoint = ($this->index - 1) - $startIndex;
|
|
echo substr($this->input, $startIndex, $endPoint);
|
|
|
|
return $char;
|
|
}
|
|
|
|
} else {
|
|
$char = false;
|
|
}
|
|
|
|
if($char === false)
|
|
throw new \RuntimeException('Unclosed multiline comment at position: ' . ($this->index - 2));
|
|
|
|
// if we're here c is part of the comment and therefore tossed
|
|
if(isset($this->c))
|
|
unset($this->c);
|
|
|
|
return $char;
|
|
}
|
|
|
|
/**
|
|
* Pushes the index ahead to the next instance of the supplied string. If it
|
|
* is found the first character of the string is returned and the index is set
|
|
* to it's position.
|
|
*
|
|
* @param string $string
|
|
* @return string|false Returns the first character of the string or false.
|
|
*/
|
|
protected function getNext($string) {
|
|
// Find the next occurrence of "string" after the current position.
|
|
$pos = strpos($this->input, $string, $this->index);
|
|
|
|
// If it's not there return false.
|
|
if($pos === false)
|
|
|
|
return false;
|
|
|
|
// Adjust position of index to jump ahead to the asked for string
|
|
$this->index = $pos;
|
|
|
|
// Return the first character of that string.
|
|
return substr($this->input, $this->index, 1);
|
|
}
|
|
|
|
/**
|
|
* When a javascript string is detected this function crawls for the end of
|
|
* it and saves the whole string.
|
|
*
|
|
* @throws \RuntimeException Unclosed strings will throw an error
|
|
*/
|
|
protected function saveString() {
|
|
$startpos = $this->index;
|
|
|
|
// saveString is always called after a gets cleared, so we push b into
|
|
// that spot.
|
|
$this->a = $this->b;
|
|
|
|
// If this isn't a string we don't need to do anything.
|
|
if ($this->a != "'" && $this->a != '"') {
|
|
return;
|
|
}
|
|
|
|
// String type is the quote used, " or '
|
|
$stringType = $this->a;
|
|
|
|
// Echo out that starting quote
|
|
echo $this->a;
|
|
|
|
// Loop until the string is done
|
|
while (1) {
|
|
|
|
// Grab the very next character and load it into a
|
|
$this->a = $this->getChar();
|
|
|
|
switch ($this->a) {
|
|
|
|
// If the string opener (single or double quote) is used
|
|
// output it and break out of the while loop-
|
|
// The string is finished!
|
|
case $stringType:
|
|
break 2;
|
|
|
|
// New lines in strings without line delimiters are bad- actual
|
|
// new lines will be represented by the string \n and not the actual
|
|
// character, so those will be treated just fine using the switch
|
|
// block below.
|
|
case "\n":
|
|
throw new \RuntimeException('Unclosed string at position: ' . $startpos );
|
|
break;
|
|
|
|
// Escaped characters get picked up here. If it's an escaped new line it's not really needed
|
|
case '\\':
|
|
|
|
// a is a slash. We want to keep it, and the next character,
|
|
// unless it's a new line. New lines as actual strings will be
|
|
// preserved, but escaped new lines should be reduced.
|
|
$this->b = $this->getChar();
|
|
|
|
// If b is a new line we discard a and b and restart the loop.
|
|
if ($this->b == "\n") {
|
|
break;
|
|
}
|
|
|
|
// echo out the escaped character and restart the loop.
|
|
echo $this->a . $this->b;
|
|
break;
|
|
|
|
|
|
// Since we're not dealing with any special cases we simply
|
|
// output the character and continue our loop.
|
|
default:
|
|
echo $this->a;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* When a regular expression is detected this function crawls for the end of
|
|
* it and saves the whole regex.
|
|
*
|
|
* @throws \RuntimeException Unclosed regex will throw an error
|
|
*/
|
|
protected function saveRegex() {
|
|
echo $this->a . $this->b;
|
|
|
|
while (($this->a = $this->getChar()) !== false) {
|
|
if($this->a == '/') {
|
|
break;
|
|
}
|
|
if ($this->a == '\\') {
|
|
echo $this->a;
|
|
$this->a = $this->getChar();
|
|
}
|
|
|
|
if($this->a == "\n") {
|
|
throw new \RuntimeException('Unclosed regex pattern at position: ' . $this->index);
|
|
}
|
|
echo $this->a;
|
|
}
|
|
$this->b = $this->getReal();
|
|
}
|
|
|
|
/**
|
|
* Checks to see if a character is alphanumeric.
|
|
*
|
|
* @param string $char Just one character
|
|
* @return bool
|
|
*/
|
|
protected static function isAlphaNumeric($char) {
|
|
return preg_match('/^[\w\$]$/', $char) === 1 || $char == '/';
|
|
}
|
|
|
|
/**
|
|
* Replace patterns in the given string and store the replacement
|
|
*
|
|
* @param string $js The string to lock
|
|
* @return bool
|
|
*/
|
|
protected function lock($js) {
|
|
/* lock things like <code>"asd" + ++x;</code> */
|
|
$lock = '"LOCK---' . crc32(time()) . '"';
|
|
|
|
$matches = array();
|
|
preg_match('/([\+\-])(\s+)([\+\-])/', $js, $matches);
|
|
if (empty($matches)) {
|
|
return $js;
|
|
}
|
|
|
|
$this->locks[$lock] = $matches[2];
|
|
|
|
$js = preg_replace('/([+-])\s+([+-])/', "$1{$lock}$2", $js);
|
|
/* -- */
|
|
|
|
return $js;
|
|
}
|
|
|
|
/**
|
|
* Replace "locks" with the original characters
|
|
*
|
|
* @param string $js The string to unlock
|
|
* @return bool
|
|
*/
|
|
protected function unlock($js) {
|
|
if (!count($this->locks)) {
|
|
return $js;
|
|
}
|
|
foreach ($this->locks as $lock => $replacement) {
|
|
$js = str_replace($lock, $replacement, $js);
|
|
}
|
|
return $js;
|
|
}
|
|
|
|
}
|
|
|
|
class MinifyException extends Exception {} |