Файл: adultscript-2.0.3-pro/files/libraries/jsmin/JSMin.php
Строк: 286
<?php
/**
* jsmin.php - PHP implementation of Douglas Crockford's JSMin.
*
* This is a direct port of jsmin.c to PHP with a few PHP performance tweaks and
* modifications to preserve some comments (see below). Also, rather than using
* stdin/stdout, JSMin::minify() accepts a string as input and returns another
* string as output.
*
* Comments containing IE conditional compilation are preserved, as are multi-line
* comments that begin with "/*!" (for documentation purposes). In the latter case
* newlines are inserted around the comment to enhance readability.
*
* Known issue: regular expressions containing quote characters must be proceeded
* by one of the following characters: (,=:[!&|?
* E.g. JSMin will fail on the following: return /'/;
* The simple workaround is to wrap the expression in parenthesis: return (/'/);
*
* 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> (PHP port)
* @author Steve Clay <steve@mrclay.org> (modifications + cleanup)
* @author Andrea Giammarchi <http://www.3site.eu> (spaceBeforeRegExp)
* @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
* @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 = '';
/**
* Minify Javascript
*
* @param string $js Javascript to be minified
* @return string
*/
public static function minify($js)
{
$jsmin = new JSMin($js);
return $jsmin->min();
}
protected function __construct($input)
{
$this->input = str_replace("rn", "n", $input);
$this->inputLength = strlen($this->input);
}
protected function action($d)
{
switch ($d) {
case 1:
$this->output .= $this->a;
// fallthrough
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();
}
}
}
// fallthrough
case 3:
$this->b = $this->next();
if ($this->b === '/') {
switch ($this->a) {
case "n":
case ' ':
if (! $this->spaceBeforeRegExp($this->output)) {
break;
}
case '{':
case ';':
case '(':
case ',':
case '=':
case ':':
case '[':
case '!':
case '&':
case '|':
case '?':
$this->output .= $this->a.$this->b;
for (;;) {
$this->a = $this->get();
if ($this->a === '/') {
break; // for (;;)
} 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 = $this->next();
break; // switch ($this->a)
// end case ?
}
}
break; // switch ($d)
// end case 3
}
}
protected function get()
{
$c = $this->lookAhead;
$this->lookAhead = null;
if ($c === null) {
if ($this->inputIndex < $this->inputLength) {
$c = $this->input[$this->inputIndex];
$this->inputIndex += 1;
} else {
$c = null;
}
}
return ($c === "r")
? "n"
: ($c === null || $c === "n" || ord($c) >= self::ORD_SPACE
? $c
: ' ');
}
protected function isAlphaNum($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)) {
$this->action(1);
break; // switch ($this->b)
}
$this->action(3);
break; // switch ($this->b)
case "n":
switch ($this->a) {
case '}':
case ']':
case ')':
case '+':
case '-':
case '"':
case "'":
$this->action(1);
break; // switch ($this->a)
default:
if ($this->isAlphaNum($this->a)) {
$this->action(1);
} else {
$this->action(3);
}
}
break; // switch ($this->b)
default:
$this->action(1);
break; // switch ($this->b)
}
// end default
}
}
return $this->output;
}
protected function next()
{
$get = $this->get();
if ($get === '/') {
$commentContents = '';
switch ($this->peek()) {
case '/':
// "//" comment
for (;;) {
$get = $this->get();
$commentContents .= $get;
if (ord($get) <= self::ORD_LF) {
return preg_match('/^\/@(?:cc_on|if|elif|else|end)\b/', $commentContents)
? "/{$commentContents}"
: $get;
}
}
case '*':
// "/* */" comment
$this->get();
for (;;) {
$get = $this->get();
switch ($get) {
case '*':
if ($this->peek() === '/') {
$this->get();
if (0 === strpos($commentContents, '!')) {
// YUI Compressor style
return "n/*" . substr($commentContents, 1) . "*/n";
}
return preg_match('/^@(?:cc_on|if|elif|else|end)\b/', $commentContents)
? "/*{$commentContents}*/" // IE conditional compilation
: ' ';
}
break;
case null:
throw new JSMinException('Unterminated comment.');
}
$commentContents .= $get;
}
default:
return $get;
}
}
return $get;
}
protected function peek()
{
$this->lookAhead = $this->get();
return $this->lookAhead;
}
protected function spaceBeforeRegExp($output)
{
$length = strlen($output);
$isSpace = false;
$tmp = "";
foreach (array("case", "else", "in", "return", "typeof") as $word) {
if ($length === strlen($word)) {
$isSpace = ($word === $output);
} elseif ($length > strlen($word)) {
$tmp = substr($output, $length - strlen($word) - 1);
$isSpace = (substr($tmp, 1) === $word) && ! $this->isAlphaNum($tmp[0]);
}
if ($isSpace) {
break;
}
}
return ($length < 2)
? true
: $isSpace;
}
}
class JSMinException extends Exception {
}