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<?php |
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namespace samsonphp\minify; |
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use Exception; |
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/** |
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* jsmin.php - extended PHP implementation of Douglas Crockford's JSMin. |
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* |
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* <code> |
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* $minifiedJs = JSMin::minify($js); |
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* </code> |
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* |
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* This is a direct port of jsmin.c to PHP with a few PHP performance tweaks and |
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* modifications to preserve some comments (see below). Also, rather than using |
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* stdin/stdout, JSMin::minify() accepts a string as input and returns another |
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* string as output. |
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* |
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* Comments containing IE conditional compilation are preserved, as are multi-line |
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* comments that begin with "/*!" (for documentation purposes). In the latter case |
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* newlines are inserted around the comment to enhance readability. |
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* |
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* PHP 5 or higher is required. |
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* |
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* Permission is hereby granted to use this version of the library under the |
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* same terms as jsmin.c, which has the following license: |
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* |
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* -- |
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* Copyright (c) 2002 Douglas Crockford (www.crockford.com) |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy of |
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* this software and associated documentation files (the "Software"), to deal in |
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* the Software without restriction, including without limitation the rights to |
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies |
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* of the Software, and to permit persons to whom the Software is furnished to do |
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* so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* The Software shall be used for Good, not Evil. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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* -- |
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* |
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* @package JSMin |
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* @author Ryan Grove <[email protected]> (PHP port) |
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* @author Steve Clay <[email protected]> (modifications + cleanup) |
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* @author Andrea Giammarchi <http://www.3site.eu> (spaceBeforeRegExp) |
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* @copyright 2002 Douglas Crockford <[email protected]> (jsmin.c) |
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* @copyright 2008 Ryan Grove <[email protected]> (PHP port) |
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* @license http://opensource.org/licenses/mit-license.php MIT License |
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* @link http://code.google.com/p/jsmin-php/ |
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*/ |
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class JSMin { |
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const ORD_LF = 10; |
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const ORD_SPACE = 32; |
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const ACTION_KEEP_A = 1; |
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const ACTION_DELETE_A = 2; |
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const ACTION_DELETE_A_B = 3; |
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protected $a = "\n"; |
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protected $b = ''; |
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protected $input = ''; |
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protected $inputIndex = 0; |
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protected $inputLength = 0; |
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protected $lookAhead = null; |
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protected $output = ''; |
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public function __construct($input) |
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{ |
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$this->input = $input; |
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} |
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/* |
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* Don't create a JSMin instance, instead use the static function minify, |
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* which checks for mb_string function overloading and avoids errors |
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* trying to re-minify the output of Closure Compiler |
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* |
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* @private |
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*/ |
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/** |
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* Minify Javascript |
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* |
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* @param string $js Javascript to be minified |
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* |
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* @return string |
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*/ |
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public static function minify($js) |
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{ |
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// look out for syntax like "++ +" and "- ++" |
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$p = '\\+'; |
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$m = '\\-'; |
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if (preg_match("/([$p$m])(?:\\1 [$p$m]| (?:$p$p|$m$m))/", $js)) { |
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// likely pre-minified and would be broken by JSMin |
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return $js; |
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} |
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$jsmin = new JSMin($js); |
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return $jsmin->min(); |
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} |
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/** |
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* Perform minification, return result |
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*/ |
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public function min() |
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{ |
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if ($this->output !== '') { // min already run |
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return $this->output; |
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} |
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$mbIntEnc = null; |
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if (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2)) { |
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$mbIntEnc = mb_internal_encoding(); |
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mb_internal_encoding('8bit'); |
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} |
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$this->input = str_replace("\r\n", "\n", $this->input); |
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$this->inputLength = strlen($this->input); |
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$this->action(self::ACTION_DELETE_A_B); |
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while ($this->a !== null) { |
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// determine next command |
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$command = self::ACTION_KEEP_A; // default |
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if ($this->a === ' ') { |
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if (! $this->isAlphaNum($this->b)) { |
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$command = self::ACTION_DELETE_A; |
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} |
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} elseif ($this->a === "\n") { |
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if ($this->b === ' ') { |
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$command = self::ACTION_DELETE_A_B; |
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// in case of mbstring.func_overload & 2, must check for null b, |
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// otherwise mb_strpos will give WARNING |
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} elseif ($this->b === null |
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|| (FALSE === strpos('{[(+-', $this->b) |
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&& ! $this->isAlphaNum($this->b))) { |
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$command = self::ACTION_DELETE_A; |
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} |
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} elseif (! $this->isAlphaNum($this->a)) { |
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if ($this->b === ' ' |
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|| ($this->b === "\n" |
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&& (FALSE === strpos('}])+-"\'', $this->a)))) { |
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$command = self::ACTION_DELETE_A_B; |
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} |
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} |
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$this->action($command); |
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} |
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$this->output = trim($this->output); |
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if ($mbIntEnc !== null) { |
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mb_internal_encoding($mbIntEnc); |
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} |
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return $this->output; |
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} |
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/** |
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* ACTION_KEEP_A = Output A. Copy B to A. Get the next B. |
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* ACTION_DELETE_A = Copy B to A. Get the next B. |
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* ACTION_DELETE_A_B = Get the next B. |
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*/ |
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protected function action($command) |
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{ |
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switch ($command) { |
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case self::ACTION_KEEP_A: |
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$this->output .= $this->a; |
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// fallthrough |
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case self::ACTION_DELETE_A: |
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$this->a = $this->b; |
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if ($this->a === "'" || $this->a === '"') { // string literal |
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$str = $this->a; // in case needed for exception |
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while (TRUE) { |
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$this->output .= $this->a; |
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$this->a = $this->get(); |
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if ($this->a === $this->b) { // end quote |
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break; |
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} |
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if (ord($this->a) <= self::ORD_LF) { |
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throw new JSMin_UnterminatedStringException( |
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"JSMin: Unterminated String at byte " |
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. $this->inputIndex . ": {$str}"); |
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} |
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$str .= $this->a; |
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if ($this->a === '\\') { |
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$this->output .= $this->a; |
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$this->a = $this->get(); |
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$str .= $this->a; |
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} |
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} |
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} |
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// fallthrough |
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case self::ACTION_DELETE_A_B: |
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$this->b = $this->next(); |
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if ($this->b === '/' && $this->isRegexpLiteral()) { // RegExp literal |
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$this->output .= $this->a . $this->b; |
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$pattern = '/'; // in case needed for exception |
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while (TRUE) { |
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$this->a = $this->get(); |
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$pattern .= $this->a; |
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if ($this->a === '/') { // end pattern |
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break; // while (TRUE) |
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} elseif ($this->a === '\\') { |
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$this->output .= $this->a; |
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$this->a = $this->get(); |
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$pattern .= $this->a; |
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} elseif (ord($this->a) <= self::ORD_LF) { |
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throw new JSMin_UnterminatedRegExpException( |
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"JSMin: Unterminated RegExp at byte " |
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. $this->inputIndex .": {$pattern}"); |
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} |
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$this->output .= $this->a; |
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} |
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$this->b = $this->next(); |
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} |
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// end case ACTION_DELETE_A_B |
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} |
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} |
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/** |
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* Get next char. Convert ctrl char to space. |
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*/ |
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protected function get() |
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{ |
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$c = $this->lookAhead; |
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$this->lookAhead = null; |
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if ($c === null) { |
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if ($this->inputIndex < $this->inputLength) { |
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$c = $this->input[$this->inputIndex]; |
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$this->inputIndex += 1; |
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} else { |
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return null; |
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} |
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} |
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if ($c === "\r" || $c === "\n") { |
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return "\n"; |
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} |
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if (ord($c) < self::ORD_SPACE) { // control char |
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return ' '; |
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} |
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return $c; |
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} |
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/** |
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* Get the next character, skipping over comments. |
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* Some comments may be preserved. |
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*/ |
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protected function next() |
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{ |
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$get = $this->get(); |
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if ($get !== '/') { |
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return $get; |
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} |
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switch ($this->peek()) { |
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case '/': |
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return $this->singleLineComment(); |
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case '*': |
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return $this->multipleLineComment(); |
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default: |
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return $get; |
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} |
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} |
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/** |
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* Get next char. If is ctrl character, translate to a space or newline. |
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*/ |
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protected function peek() |
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{ |
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$this->lookAhead = $this->get(); |
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return $this->lookAhead; |
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} |
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protected function singleLineComment() |
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{ |
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$comment = ''; |
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while (TRUE) { |
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$get = $this->get(); |
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$comment .= $get; |
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if (ord($get) <= self::ORD_LF) { // EOL reached |
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// if IE conditional comment |
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if (preg_match('/^\\/@(?:cc_on|if|elif|else|end)\\b/', $comment)) { |
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return "/{$comment}"; |
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} |
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return $get; |
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} |
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} |
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} |
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protected function multipleLineComment() |
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{ |
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$this->get(); |
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$comment = ''; |
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while (TRUE) { |
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$get = $this->get(); |
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if ($get === '*') { |
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if ($this->peek() === '/') { // end of comment reached |
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$this->get(); |
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// if comment preserved by YUI Compressor |
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if (0 === strpos($comment, '!')) { |
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return "\n/*" . substr($comment, 1) . "*/\n"; |
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} |
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// if IE conditional comment |
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if (preg_match('/^@(?:cc_on|if|elif|else|end)\\b/', $comment)) { |
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return "/*{$comment}*/"; |
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} |
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return ' '; |
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} |
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} elseif ($get === null) { |
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throw new JSMin_UnterminatedCommentException( |
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"JSMin: Unterminated comment at byte " |
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. $this->inputIndex . ": /*{$comment}"); |
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} |
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$comment .= $get; |
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} |
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} |
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protected function isRegexpLiteral() |
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{ |
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if (FALSE !== strpos("\n{;(,=:[!&|?", $this->a)) { // we aren't dividing |
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return TRUE; |
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} |
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if (' ' === $this->a) { |
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$length = strlen($this->output); |
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if ($length < 2) { // weird edge case |
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return TRUE; |
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} |
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// you can't divide a keyword |
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if (preg_match('/(?:case|else|in|return|typeof)$/', $this->output, $m)) { |
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if ($this->output === $m[0]) { // odd but could happen |
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return TRUE; |
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} |
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// make sure it's a keyword, not end of an identifier |
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$charBeforeKeyword = substr($this->output, $length - strlen($m[0]) - 1, 1); |
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if (!$this->isAlphaNum($charBeforeKeyword)) { |
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return TRUE; |
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} |
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} |
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} |
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return FALSE; |
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} |
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/** |
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* Is $c a letter, digit, underscore, dollar sign, escape, or non-ASCII? |
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*/ |
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protected function isAlphaNum($c) |
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{ |
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return (preg_match('/^[0-9a-zA-Z_\\$\\\\]$/', $c) || ord($c) > 126); |
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} |
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} |
354
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class JSMin_UnterminatedStringException extends Exception {} |
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356
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|
|
class JSMin_UnterminatedCommentException extends Exception {} |
|
|
|
|
357
|
|
|
class JSMin_UnterminatedRegExpException extends Exception {} |
|
|
|
|
358
|
|
|
|