Maison > Article > développement back-end > Comment compresser et fusionner js en php
Comment compresser et fusionner js en php
- 墨辰丷original
- 2018-06-01 11:02:331714parcourir
这篇文章主要介绍了php实现压缩合并js的方法,涉及php压缩文件类JSMin的相关调用与使用技巧,并附带了完整的demo源码供读者下载参考,需要的朋友可以参考下
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 {}
?>
总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。
相关推荐：
Ce qui précède est le contenu détaillé de. pour plus d'informations, suivez d'autres articles connexes sur le site Web de PHP en chinois!
Déclaration：
Le contenu de cet article est volontairement contribué par les internautes et les droits d'auteur appartiennent à l'auteur original. Ce site n'assume aucune responsabilité légale correspondante. Si vous trouvez un contenu suspecté de plagiat ou de contrefaçon, veuillez contacter admin@php.cn
Article précédent：Opération de séparation lecture-écriture Mysql implémentée par PHPArticle suivant：Opération de séparation lecture-écriture Mysql implémentée par PHP
Articles Liés
Voir plus- Comment utiliser cURL pour implémenter les requêtes Get et Post en PHP
- Comment utiliser cURL pour implémenter les requêtes Get et Post en PHP
- Comment utiliser cURL pour implémenter les requêtes Get et Post en PHP
- Comment utiliser cURL pour implémenter les requêtes Get et Post en PHP
- Tous les symboles d'expression dans les expressions régulières (résumé)