375 lines
11 KiB
PHP
375 lines
11 KiB
PHP
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<?php
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/**
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* jsmin.php - PHP implementation of Douglas Crockford's JSMin.
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*
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* This is pretty much a direct port of jsmin.c to PHP with just a few
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* PHP-specific performance tweaks. Also, whereas jsmin.c reads from stdin and
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* outputs to stdout, this library accepts a string as input and returns another
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* string as output.
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*
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* PHP 5 or higher is required.
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*
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* Permission is hereby granted to use this version of the library under the
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* same terms as jsmin.c, which has the following license:
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*
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* --
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* Copyright (c) 2002 Douglas Crockford (www.crockford.com)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* The Software shall be used for Good, not Evil.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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* --
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*
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* @package JSMin
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* @author Ryan Grove <ryan@wonko.com>
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* @copyright 2002 Douglas Crockford <douglas@crockford.com> (jsmin.c)
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* @copyright 2008 Ryan Grove <ryan@wonko.com> (PHP port)
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* @license http://opensource.org/licenses/mit-license.php MIT License
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* @version 1.1.1 (2008-03-02)
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* @link https://github.com/rgrove/jsmin-php/
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*/
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class JSMin {
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const ORD_LF = 10;
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const ORD_SPACE = 32;
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const ACTION_KEEP_A = 1;
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const ACTION_DELETE_A = 2;
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const ACTION_DELETE_A_B = 3;
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protected $a = '';
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protected $b = '';
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protected $input = '';
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protected $inputIndex = 0;
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protected $inputLength = 0;
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protected $lookAhead = null;
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protected $output = '';
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// -- Public Static Methods --------------------------------------------------
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/**
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* Minify Javascript
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*
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* @uses __construct()
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* @uses min()
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* @param string $js Javascript to be minified
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* @return string
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*/
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public static function minify($js) {
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$jsmin = new JSMin($js);
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return $jsmin->min();
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}
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// -- Public Instance Methods ------------------------------------------------
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/**
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* Constructor
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*
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* @param string $input Javascript to be minified
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*/
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public function __construct($input) {
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$this->input = str_replace("\r\n", "\n", $input);
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$this->inputLength = strlen($this->input);
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}
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// -- Protected Instance Methods ---------------------------------------------
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/**
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* Action -- do something! What to do is determined by the $command argument.
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*
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* action treats a string as a single character. Wow!
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* action recognizes a regular expression if it is preceded by ( or , or =.
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*
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* @uses next()
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* @uses get()
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* @throws JSMinException If parser errors are found:
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* - Unterminated string literal
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* - Unterminated regular expression set in regex literal
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* - Unterminated regular expression literal
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* @param int $command One of class constants:
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* ACTION_KEEP_A Output A. Copy B to A. Get the next B.
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* ACTION_DELETE_A Copy B to A. Get the next B. (Delete A).
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* ACTION_DELETE_A_B Get the next B. (Delete B).
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*/
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protected function action($command) {
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switch($command) {
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case self::ACTION_KEEP_A:
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$this->output .= $this->a;
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case self::ACTION_DELETE_A:
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$this->a = $this->b;
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if ($this->a === "'" || $this->a === '"') {
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for (;;) {
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$this->output .= $this->a;
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$this->a = $this->get();
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if ($this->a === $this->b) {
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break;
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}
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if (ord($this->a) <= self::ORD_LF) {
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throw new JSMinException('Unterminated string literal.');
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}
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if ($this->a === '\\') {
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$this->output .= $this->a;
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$this->a = $this->get();
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}
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}
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}
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case self::ACTION_DELETE_A_B:
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$this->b = $this->next();
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if ($this->b === '/' && (
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$this->a === '(' || $this->a === ',' || $this->a === '=' ||
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$this->a === ':' || $this->a === '[' || $this->a === '!' ||
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$this->a === '&' || $this->a === '|' || $this->a === '?' ||
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$this->a === '{' || $this->a === '}' || $this->a === ';' ||
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$this->a === "\n" )) {
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$this->output .= $this->a . $this->b;
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for (;;) {
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$this->a = $this->get();
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if ($this->a === '[') {
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/*
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inside a regex [...] set, which MAY contain a '/' itself. Example: mootools Form.Validator near line 460:
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return Form.Validator.getValidator('IsEmpty').test(element) || (/^(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]\.?){0,63}[a-z0-9!#$%&'*+/=?^_`{|}~-]@(?:(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)*[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\])$/i).test(element.get('value'));
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*/
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for (;;) {
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$this->output .= $this->a;
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$this->a = $this->get();
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if ($this->a === ']') {
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break;
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} elseif ($this->a === '\\') {
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$this->output .= $this->a;
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$this->a = $this->get();
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} elseif (ord($this->a) <= self::ORD_LF) {
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throw new JSMinException('Unterminated regular expression set in regex literal.');
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}
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}
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} elseif ($this->a === '/') {
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break;
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} elseif ($this->a === '\\') {
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$this->output .= $this->a;
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$this->a = $this->get();
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} elseif (ord($this->a) <= self::ORD_LF) {
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throw new JSMinException('Unterminated regular expression literal.');
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}
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$this->output .= $this->a;
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}
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$this->b = $this->next();
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}
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}
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}
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/**
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* Get next char. Convert ctrl char to space.
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*
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* @return string|null
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*/
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protected function get() {
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$c = $this->lookAhead;
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$this->lookAhead = null;
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if ($c === null) {
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if ($this->inputIndex < $this->inputLength) {
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$c = substr($this->input, $this->inputIndex, 1);
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$this->inputIndex += 1;
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} else {
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$c = null;
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}
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}
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if ($c === "\r") {
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return "\n";
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}
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if ($c === null || $c === "\n" || ord($c) >= self::ORD_SPACE) {
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return $c;
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}
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return ' ';
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}
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/**
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* Is $c a letter, digit, underscore, dollar sign, or non-ASCII character.
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*
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* @return bool
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*/
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protected function isAlphaNum($c) {
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return ord($c) > 126 || $c === '\\' || preg_match('/^[\w\$]$/', $c) === 1;
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}
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/**
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* Perform minification, return result
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*
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* @uses action()
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* @uses isAlphaNum()
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* @return string
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*/
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protected function min() {
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$this->a = "\n";
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$this->action(self::ACTION_DELETE_A_B);
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while ($this->a !== null) {
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switch ($this->a) {
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case ' ':
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if ($this->isAlphaNum($this->b)) {
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$this->action(self::ACTION_KEEP_A);
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} else {
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$this->action(self::ACTION_DELETE_A);
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}
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break;
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case "\n":
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switch ($this->b) {
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case '{':
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case '[':
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case '(':
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case '+':
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case '-':
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$this->action(self::ACTION_KEEP_A);
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break;
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case ' ':
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$this->action(self::ACTION_DELETE_A_B);
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break;
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default:
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if ($this->isAlphaNum($this->b)) {
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$this->action(self::ACTION_KEEP_A);
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}
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else {
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$this->action(self::ACTION_DELETE_A);
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}
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}
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break;
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default:
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switch ($this->b) {
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case ' ':
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if ($this->isAlphaNum($this->a)) {
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$this->action(self::ACTION_KEEP_A);
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break;
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}
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$this->action(self::ACTION_DELETE_A_B);
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break;
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case "\n":
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switch ($this->a) {
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case '}':
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case ']':
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case ')':
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case '+':
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case '-':
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case '"':
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case "'":
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$this->action(self::ACTION_KEEP_A);
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break;
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default:
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if ($this->isAlphaNum($this->a)) {
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$this->action(self::ACTION_KEEP_A);
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}
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else {
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$this->action(self::ACTION_DELETE_A_B);
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}
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}
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break;
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default:
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$this->action(self::ACTION_KEEP_A);
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break;
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}
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}
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}
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return $this->output;
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}
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/**
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* Get the next character, skipping over comments. peek() is used to see
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* if a '/' is followed by a '/' or '*'.
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*
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* @uses get()
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* @uses peek()
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* @throws JSMinException On unterminated comment.
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* @return string
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*/
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protected function next() {
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$c = $this->get();
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if ($c === '/') {
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switch($this->peek()) {
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case '/':
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for (;;) {
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$c = $this->get();
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if (ord($c) <= self::ORD_LF) {
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return $c;
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}
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}
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case '*':
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$this->get();
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for (;;) {
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switch($this->get()) {
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case '*':
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if ($this->peek() === '/') {
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$this->get();
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return ' ';
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}
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break;
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case null:
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throw new JSMinException('Unterminated comment.');
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}
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}
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default:
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return $c;
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}
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}
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return $c;
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}
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/**
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* Get next char. If is ctrl character, translate to a space or newline.
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*
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* @uses get()
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* @return string|null
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*/
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protected function peek() {
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$this->lookAhead = $this->get();
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return $this->lookAhead;
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}
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}
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// -- Exceptions ---------------------------------------------------------------
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class JSMinException extends Exception {}
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?>
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