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jsmin php,jsmin.php

邓卓
2023-12-01

/**

* 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

* @copyright 2002 Douglas Crockford (jsmin.c)

* @copyright 2008 Ryan Grove (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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