php实现压缩合并js的方法【附demo源码下载】

本文实例讲述了php实现压缩合并js的方法。分享给大家供大家参考，具体如下：

test.php文件如下：

require_once('jsmin.php');

$files = glob("js/*.js");

$js = "";

foreach($files as $file) {

$js .= JSMin::minify(file_get_contents($file));

}

file_put_contents("combined.js", $js);

echo "success";

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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:

*

* --

*

* 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>

* @license http://opensource.org/licenses/mit-license.php MIT License

* @version 1.1.2 (2012-05-01)

* @link https://github.com/rgrove/jsmin-php

*/

class JSMin {

const ORD_LF = 10;

const ORD_SPACE = 32;

const ACTION_KEEP_A = 1;

const ACTION_DELETE_A = 2;

const ACTION_DELETE_A_B = 3;

protected $a = '';

protected $b = '';

protected $input = '';

protected $inputIndex = 0;

protected $inputLength = 0;

protected $lookAhead = null;

protected $output = '';

// -- Public Static Methods --------------------------------------------------

/**

* Minify Javascript

*

* @uses __construct()

* @uses min()

* @param string $js Javascript to be minified

* @return string

*/

public static function minify($js) {

$jsmin = new JSMin($js);

return $jsmin->min();

}

// -- Public Instance Methods ------------------------------------------------

/**

* Constructor

*

* @param string $input Javascript to be minified

*/

public function __construct($input) {

$this->input = str_replace("\\r\\n", "\\n", $input);

$this->inputLength = strlen($this->input);

}

// -- Protected Instance Methods ---------------------------------------------

/**

* Action -- do something! What to do is determined by the $command argument.

*

* action treats a string as a single character. Wow!

* action recognizes a regular expression if it is preceded by ( or , or =.

*

* @uses next()

* @uses get()

* @throws JSMinException If parser errors are found:

* - Unterminated string literal

* - Unterminated regular expression set in regex literal

* - Unterminated regular expression literal

* @param int $command One of class constants:

* ACTION_KEEP_A Output A. Copy B to A. Get the next B.

* ACTION_DELETE_A Copy B to A. Get the next B. (Delete A).

* ACTION_DELETE_A_B Get the next B. (Delete B).

*/

protected function action($command) {

switch($command) {

case self::ACTION_KEEP_A:

$this->output .= $this->a;

case self::ACTION_DELETE_A:

$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 self::ACTION_DELETE_A_B:

$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->a === '{' || $this->a === '}' || $this->a === ';' ||

$this->a === "\\n" )) {

$this->output .= $this->a . $this->b;

for (;;) {

$this->a = $this->get();

if ($this->a === '[') {

/*

inside a regex [...] set, which MAY contain a '/' itself. Example: mootools Form.Validator near line 460:

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'));

*/

for (;;) {

$this->output .= $this->a;

$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 set in regex literal.');

}

} elseif ($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();

}

/**

* Get next char. Convert ctrl char to space.

*

* @return string|null

*/

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 ' ';

}

/**

* Is $c a letter, digit, underscore, dollar sign, or non-ASCII character.

*

* @return bool

*/

protected function isAlphaNum($c) {

return ord($c) > 126 || $c === '\\\\' || preg_match('/^[\\w\\$]$/', $c) === 1;

}

/**

* Perform minification, return result

*

* @uses action()

* @uses isAlphaNum()

* @uses get()

* @uses peek()

* @return string

*/

protected function min() {

if (0 == strncmp($this->peek(), "\\xef", 1)) {

$this->get();

}

$this->a = "\\n";

$this->action(self::ACTION_DELETE_A_B);

while ($this->a !== null) {

switch ($this->a) {

case ' ':

if ($this->isAlphaNum($this->b)) {

$this->action(self::ACTION_KEEP_A);

} else {

$this->action(self::ACTION_DELETE_A);

}

break;

case "\\n":

switch ($this->b) {

case '{':

case '[':

case '(':

case '+':

case '-':

case '!':

case '~':

$this->action(self::ACTION_KEEP_A);

break;

case ' ':

$this->action(self::ACTION_DELETE_A_B);

break;

default:

if ($this->isAlphaNum($this->b)) {

$this->action(self::ACTION_KEEP_A);

}

else {

$this->action(self::ACTION_DELETE_A);

}

break;

default:

switch ($this->b) {

case ' ':

if ($this->isAlphaNum($this->a)) {

$this->action(self::ACTION_KEEP_A);

break;

}

$this->action(self::ACTION_DELETE_A_B);

break;

case "\\n":

switch ($this->a) {

case '}':

case ']':

case ')':

case '+':

case '-':

case '"':

case "'":

$this->action(self::ACTION_KEEP_A);

break;

default:

if ($this->isAlphaNum($this->a)) {

$this->action(self::ACTION_KEEP_A);

}

else {

$this->action(self::ACTION_DELETE_A_B);

}

break;

default:

$this->action(self::ACTION_KEEP_A);

break;

}

return $this->output;

}

/**

* Get the next character, skipping over comments. peek() is used to see

* if a '/' is followed by a '/' or '*'.

*

* @uses get()

* @uses peek()

* @throws JSMinException On unterminated comment.

* @return string

*/

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;

}

/**

* Get next char. If is ctrl character, translate to a space or newline.

*

* @uses get()

* @return string|null

*/

protected function peek() {

$this->lookAhead = $this->get();

return $this->lookAhead;

}

// -- Exceptions ---------------------------------------------------------------

class JSMinException extends Exception {}

?>

完整实例代码点击此处本站下载。

希望本文所述对大家PHP程序设计有所帮助。

php实现压缩合并js的方法【附demo源码下载】

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