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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 2008 Ryan Grove <ryan@wonko.com> (PHP port)
+ * @license http://opensource.org/licenses/mit-license.php MIT License
+ * @version 1.1.1 (2008-03-02)
+ * @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 = '';
+
+ // -- Public Static Methods --------------------------------------------------
+
+ public static function minify( $js ) {
+ $jsmin = new JSMin( $js );
+ return $jsmin->min();
+ }
+
+ // -- Public Instance Methods ------------------------------------------------
+
+ public function __construct( $input ) {
+ $this->input = str_replace( "\r\n", "\n", $input );
+ $this->inputLength = strlen( $this->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->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 = substr( $this->input, $this->inputIndex, 1 );
+ $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 min() {
+ $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 $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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