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0 parents commit 4de319f6d61b348048d8172f1ef0c4b8475946f3 @rgrove committed May 4, 2007
Showing with 296 additions and 0 deletions.
  1. +296 −0 jsmin.php
296 jsmin.php
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+<?php
+/**
+ * jsmin.php - PHP implementation of Douglas Crockford's JSMin.
+ *
+ * This is pretty much a direct port of jsmin.c to PHP with just a few
+ * PHP-specific performance tweaks. Also, whereas jsmin.c reads from stdin and
+ * outputs to stdout, this library accepts a string as input and returns another
+ * string as output.
+ *
+ * PHP 5 or higher is required.
+ *
+ * Permission is hereby granted to use this version of the library under the
+ * same terms as jsmin.c, which has the following license:
+ *
+ * --
+ * Copyright (c) 2002 Douglas Crockford (www.crockford.com)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished to do
+ * so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * The Software shall be used for Good, not Evil.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ * --
+ *
+ * @package JSMin
+ * @author Ryan Grove <ryan@wonko.com>
+ * @copyright 2002 Douglas Crockford <douglas@crockford.com> (jsmin.c)
+ * @copyright 2007 Ryan Grove <ryan@wonko.com> (PHP port)
+ * @license http://opensource.org/licenses/mit-license.php MIT License
+ * @version 1.0.0 (2007-05-04)
+ * @link http://code.google.com/p/jsmin-php/
+ */
+
+class JSMin {
+ const ORD_LF = 10;
+ const ORD_SPACE = 32;
+
+ protected $a = '';
+ protected $b = '';
+ protected $input = '';
+ protected $inputIndex = 0;
+ protected $inputLength = 0;
+ protected $lookAhead = null;
+ protected $output = array();
+
+ // -- Public Static Methods --------------------------------------------------
+
+ public static function minify($js) {
+ $jsmin = new JSMin($js);
+ return $jsmin->jsmin();
+ }
+
+ // -- Public Instance Methods ------------------------------------------------
+
+ public function __construct($input) {
+ $this->input = $input;
+ $this->inputLength = strlen($input);
+ }
+
+ // -- Protected Instance Methods ---------------------------------------------
+
+ protected function action($d) {
+ switch($d) {
+ case 1:
+ $this->output[] = $this->a;
+
+ case 2:
+ $this->a = $this->b;
+
+ if ($this->a === "'" || $this->a === '"') {
+ for (;;) {
+ $this->output[] = $this->a;
+ $this->a = $this->get();
+
+ if ($this->a === $this->b) {
+ break;
+ }
+
+ if (ord($this->a) <= self::ORD_LF) {
+ throw new JSMinException('Unterminated string literal.');
+ }
+
+ if ($this->a === '\\') {
+ $this->output[] = $this->a;
+ $this->a = $this->get();
+ }
+ }
+ }
+
+ case 3:
+ $this->b = $this->next();
+
+ if ($this->b === '/' && (
+ $this->a === '(' || $this->a === ',' || $this->a === '=' ||
+ $this->a === ':' || $this->a === '[' || $this->a === '!' ||
+ $this->a === '&' || $this->a === '|' || $this->a === '?')) {
+
+ $this->output[] = $this->a;
+ $this->output[] = $this->b;
+
+ for (;;) {
+ $this->a = $this->get();
+
+ if ($this->a === '/') {
+ break;
+ }
+ elseif ($this->a === '\\') {
+ $this->output[] = $this->a;
+ $this->a = $this->get();
+ }
+ elseif (ord($this->a) <= self::ORD_LF) {
+ throw new JSMinException('Unterminated regular expression '.
+ 'literal.');
+ }
+
+ $this->output[] = $this->a;
+ }
+
+ $this->b = $this->next();
+ }
+ }
+ }
+
+ protected function get() {
+ $c = $this->lookAhead;
+ $this->lookAhead = null;
+
+ if ($c === null) {
+ if ($this->inputIndex < $this->inputLength) {
+ $c = $this->input[$this->inputIndex];
+ $this->inputIndex += 1;
+ }
+ else {
+ $c = null;
+ }
+ }
+
+ if ($c === "\r") {
+ return "\n";
+ }
+
+ if ($c === null || $c === "\n" || ord($c) >= self::ORD_SPACE) {
+ return $c;
+ }
+
+ return ' ';
+ }
+
+ protected function isAlphaNum($c) {
+ return ord($c) > 126 || $c === '\\' || preg_match('/^[\w\$]$/', $c) === 1;
+ }
+
+ protected function jsmin() {
+ $this->a = "\n";
+ $this->action(3);
+
+ while ($this->a !== null) {
+ switch ($this->a) {
+ case ' ':
+ if ($this->isAlphaNum($this->b)) {
+ $this->action(1);
+ }
+ else {
+ $this->action(2);
+ }
+ break;
+
+ case "\n":
+ switch ($this->b) {
+ case '{':
+ case '[':
+ case '(':
+ case '+':
+ case '-':
+ $this->action(1);
+ break;
+
+ case ' ':
+ $this->action(3);
+ break;
+
+ default:
+ if ($this->isAlphaNum($this->b)) {
+ $this->action(1);
+ }
+ else {
+ $this->action(2);
+ }
+ }
+ break;
+
+ default:
+ switch ($this->b) {
+ case ' ':
+ if ($this->isAlphaNum($this->a)) {
+ $this->action(1);
+ break;
+ }
+
+ $this->action(3);
+ break;
+
+ case "\n":
+ switch ($this->a) {
+ case '}':
+ case ']':
+ case ')':
+ case '+':
+ case '-':
+ case '"':
+ case "'":
+ $this->action(1);
+ break;
+
+ default:
+ if ($this->isAlphaNum($this->a)) {
+ $this->action(1);
+ }
+ else {
+ $this->action(3);
+ }
+ }
+ break;
+
+ default:
+ $this->action(1);
+ break;
+ }
+ }
+ }
+
+ return implode('', $this->output);
+ }
+
+ protected function next() {
+ $c = $this->get();
+
+ if ($c === '/') {
+ switch($this->peek()) {
+ case '/':
+ for (;;) {
+ $c = $this->get();
+
+ if (ord($c) <= self::ORD_LF) {
+ return $c;
+ }
+ }
+
+ case '*':
+ $this->get();
+
+ for (;;) {
+ switch($this->get()) {
+ case '*':
+ if ($this->peek() === '/') {
+ $this->get();
+ return ' ';
+ }
+ break;
+
+ case null:
+ throw new JSMinException('Unterminated comment.');
+ }
+ }
+
+ default:
+ return $c;
+ }
+ }
+
+ return $c;
+ }
+
+ protected function peek() {
+ $this->lookAhead = $this->get();
+ return $this->lookAhead;
+ }
+}
+
+// -- Exceptions ---------------------------------------------------------------
+class JSMinException extends Exception {}
+?>

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