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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 {}