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php实现压缩合并js的方法【附demo源码下载】

更新时间:2020-03-11 18:59:18 作者:startmvc
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

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";

jsmin.php文件如下:


<?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)
 * @copyright 2012 Adam Goforth <aag@adamgoforth.com> (Updates)
 * @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->get();
 $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