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<?php |
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|
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//namespace JSMin; |
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|
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/** |
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* JSMin.php - modified 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 modified port of jsmin.c. Improvements: |
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* |
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* Does not choke on some regexp literals containing quote characters. E.g. /'/ |
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* |
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* Spaces are preserved after some add/sub operators, so they are not mistakenly |
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* converted to post-inc/dec. E.g. a + ++b -> a+ ++b |
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* |
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* Preserves multi-line comments that begin with /*! |
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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 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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|
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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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protected $lastByteOut = ''; |
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protected $keptComment = ''; |
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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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$jsmin = new JSMin($js); |
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return $jsmin->min(); |
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} |
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|
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/** |
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* @param string $input |
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*/ |
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public function __construct($input) |
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{ |
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$this->input = $input; |
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} |
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|
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/** |
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* Perform minification, return result |
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* |
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* @return string |
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*/ |
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public function min() |
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{ |
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if ($this->output !== '') { // min already run |
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return $this->output; |
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} |
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|
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$mbIntEnc = null; |
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if (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2)) { |
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$mbIntEnc = mb_internal_encoding(); |
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mb_internal_encoding('8bit'); |
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} |
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|
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if (isset($this->input[0]) && $this->input[0] === "\xef") { |
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$this->input = substr($this->input, 3); |
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} |
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|
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$this->input = str_replace("\r\n", "\n", $this->input); |
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$this->inputLength = strlen($this->input); |
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|
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$this->action(self::ACTION_DELETE_A_B); |
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|
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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 ($this->isWhiteSpace($this->a)) { |
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if (($this->lastByteOut === '+' || $this->lastByteOut === '-') |
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&& ($this->b === $this->lastByteOut)) { |
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// Don't delete this space. If we do, the addition/subtraction |
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// could be parsed as a post-increment |
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} elseif (! $this->isAlphaNum($this->b)) { |
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$command = self::ACTION_DELETE_A; |
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} |
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} elseif ($this->isLineTerminator($this->a)) { |
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if ($this->isWhiteSpace($this->b)) { |
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$command = self::ACTION_DELETE_A_B; |
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|
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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 ($this->isWhiteSpace($this->b) |
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|| ($this->isLineTerminator($this->b) |
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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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|
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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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/** |
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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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* @param int $command |
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* @throws JSMin_UnterminatedRegExpException|UnterminatedStringException |
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*/ |
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protected function action($command) |
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{ |
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// make sure we don't compress "a + ++b" to "a+++b", etc. |
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if ($command === self::ACTION_DELETE_A_B |
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&& $this->b === ' ' |
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&& ($this->a === '+' || $this->a === '-')) { |
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// Note: we're at an addition/substraction operator; the inputIndex |
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// will certainly be a valid index |
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if ($this->input[$this->inputIndex] === $this->a) { |
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// This is "+ +" or "- -". Don't delete the space. |
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$command = self::ACTION_KEEP_A; |
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} |
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} |
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|
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switch ($command) { |
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case self::ACTION_KEEP_A: // 1 |
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$this->output .= $this->a; |
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|
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if ($this->keptComment) { |
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$this->output = rtrim($this->output, "\n"); |
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$this->output .= $this->keptComment; |
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$this->keptComment = ''; |
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} |
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|
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$this->lastByteOut = $this->a; |
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|
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// fallthrough intentional |
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case self::ACTION_DELETE_A: // 2 |
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$this->a = $this->b; |
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if ($this->a === "'" || $this->a === '"' || $this->a === '`') { // string/template literal |
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$delimiter = $this->a; |
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$str = $this->a; // in case needed for exception |
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for(;;) { |
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$this->output .= $this->a; |
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$this->lastByteOut = $this->a; |
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|
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$this->a = $this->get(); |
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if ($this->a === $this->b) { // end quote |
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break; |
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} |
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if ($delimiter === '`' && $this->isLineTerminator($this->a)) { |
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// leave the newline |
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} elseif ($this->isEOF($this->a)) { |
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$byte = $this->inputIndex - 1; |
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throw new JSMin_UnterminatedStringException( |
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"JSMin: Unterminated String at byte {$byte}: {$str}"); |
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} |
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$str .= $this->a; |
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if ($this->a === '\\') { |
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$this->output .= $this->a; |
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$this->lastByteOut = $this->a; |
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|
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$this->a = $this->get(); |
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$str .= $this->a; |
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} |
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} |
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} |
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|
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// fallthrough intentional |
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case self::ACTION_DELETE_A_B: // 3 |
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$this->b = $this->next(); |
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if ($this->b === '/' && $this->isRegexpLiteral()) { |
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$this->output .= $this->a . $this->b; |
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$pattern = '/'; // keep entire pattern in case we need to report it in the exception |
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for(;;) { |
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$this->a = $this->get(); |
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$pattern .= $this->a; |
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if ($this->a === '[') { |
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for(;;) { |
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$this->output .= $this->a; |
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$this->a = $this->get(); |
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$pattern .= $this->a; |
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if ($this->a === ']') { |
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break; |
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} |
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if ($this->a === '\\') { |
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$this->output .= $this->a; |
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$this->a = $this->get(); |
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$pattern .= $this->a; |
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} |
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if ($this->isEOF($this->a)) { |
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throw new JSMin_UnterminatedRegExpException( |
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"JSMin: Unterminated set in RegExp at byte " |
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. $this->inputIndex .": {$pattern}"); |
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} |
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} |
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} |
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|
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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 .= $this->a; |
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} elseif ($this->isEOF($this->a)) { |
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$byte = $this->inputIndex - 1; |
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throw new JSMin_UnterminatedRegExpException( |
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"JSMin: Unterminated RegExp at byte {$byte}: {$pattern}"); |
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} |
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$this->output .= $this->a; |
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$this->lastByteOut = $this->a; |
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} |
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$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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/** |
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* @return bool |
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*/ |
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protected function isRegexpLiteral() |
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{ |
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if (false !== strpos("(,=:[!&|?+-~*{;", $this->a)) { |
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// we can't divide after these tokens |
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return true; |
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} |
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|
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// check if first non-ws token is "/" (see starts-regex.js) |
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$length = strlen($this->output); |
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if ($this->isWhiteSpace($this->a) || $this->isLineTerminator($this->a)) { |
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if ($length < 2) { // weird edge case |
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return true; |
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} |
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} |
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|
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// if the "/" follows a keyword, it must be a regexp, otherwise it's best to assume division |
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|
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$subject = $this->output . trim($this->a); |
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if (!preg_match('/(?:case|else|in|return|typeof)$/', $subject, $m)) { |
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// not a keyword |
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return false; |
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} |
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|
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// can't be sure it's a keyword yet (see not-regexp.js) |
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$charBeforeKeyword = substr($subject, 0 - strlen($m[0]) - 1, 1); |
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if ($this->isAlphaNum($charBeforeKeyword)) { |
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// this is really an identifier ending in a keyword, e.g. "xreturn" |
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return false; |
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} |
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|
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// it's a regexp. Remove unneeded whitespace after keyword |
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if ($this->isWhiteSpace($this->a) || $this->isLineTerminator($this->a)) { |
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$this->a = ''; |
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} |
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|
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return true; |
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} |
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|
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/** |
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* Return the next character from stdin. Watch out for lookahead. If the character is a control character, |
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* translate it to a space or linefeed. |
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* |
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* @return string |
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*/ |
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protected function get() |
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{ |
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$c = $this->lookAhead; |
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$this->lookAhead = null; |
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if ($c === null) { |
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// getc(stdin) |
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if ($this->inputIndex < $this->inputLength) { |
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$c = $this->input[$this->inputIndex]; |
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$this->inputIndex += 1; |
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} else { |
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$c = null; |
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} |
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} |
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if ($c === "\r") { |
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return "\n"; |
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} |
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return $c; |
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} |
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|
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/** |
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* Does $a indicate end of input? |
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* |
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* @param string $a |
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* @return bool |
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*/ |
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protected function isEOF($a) |
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{ |
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return $a === null || $this->isLineTerminator($a); |
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} |
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|
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/** |
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* Get next char (without getting it). If is ctrl character, translate to a space or newline. |
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* |
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* @return string |
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*/ |
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protected function peek() |
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{ |
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$this->lookAhead = $this->get(); |
| 361 |
return $this->lookAhead; |
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} |
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|
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/** |
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* Return true if the character is a letter, digit, underscore, dollar sign, or non-ASCII character. |
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* |
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* @param string $c |
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* |
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* @return bool |
| 370 |
*/ |
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protected function isAlphaNum($c) |
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{ |
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return (preg_match('/^[a-z0-9A-Z_\\$\\\\]$/', $c) || ord($c) > 126); |
| 374 |
} |
| 375 |
|
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/** |
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* Consume a single line comment from input (possibly retaining it) |
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*/ |
| 379 |
protected function consumeSingleLineComment() |
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{ |
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$comment = ''; |
| 382 |
while (true) { |
| 383 |
$get = $this->get(); |
| 384 |
$comment .= $get; |
| 385 |
if ($this->isEOF($get)) { |
| 386 |
// if IE conditional comment |
| 387 |
if (preg_match('/^\\/@(?:cc_on|if|elif|else|end)\\b/', $comment)) { |
| 388 |
$this->keptComment .= "/{$comment}"; |
| 389 |
} |
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return; |
| 391 |
} |
| 392 |
} |
| 393 |
} |
| 394 |
|
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/** |
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* Consume a multiple line comment from input (possibly retaining it) |
| 397 |
* |
| 398 |
* @throws JSMin_UnterminatedCommentException |
| 399 |
*/ |
| 400 |
protected function consumeMultipleLineComment() |
| 401 |
{ |
| 402 |
$this->get(); |
| 403 |
$comment = ''; |
| 404 |
for(;;) { |
| 405 |
$get = $this->get(); |
| 406 |
if ($get === '*') { |
| 407 |
if ($this->peek() === '/') { // end of comment reached |
| 408 |
$this->get(); |
| 409 |
if (0 === strpos($comment, '!')) { |
| 410 |
// preserved by YUI Compressor |
| 411 |
if (!$this->keptComment) { |
| 412 |
// don't prepend a newline if two comments right after one another |
| 413 |
$this->keptComment = "\n"; |
| 414 |
} |
| 415 |
$this->keptComment .= "/*!" . substr($comment, 1) . "*/\n"; |
| 416 |
} else if (preg_match('/^@(?:cc_on|if|elif|else|end)\\b/', $comment)) { |
| 417 |
// IE conditional |
| 418 |
$this->keptComment .= "/*{$comment}*/"; |
| 419 |
} |
| 420 |
return; |
| 421 |
} |
| 422 |
} elseif ($get === null) { |
| 423 |
throw new JSMin_UnterminatedCommentException( |
| 424 |
"JSMin: Unterminated comment at byte {$this->inputIndex}: /*{$comment}"); |
| 425 |
} |
| 426 |
$comment .= $get; |
| 427 |
} |
| 428 |
} |
| 429 |
|
| 430 |
/** |
| 431 |
* Get the next character, skipping over comments. Some comments may be preserved. |
| 432 |
* |
| 433 |
* @return string |
| 434 |
*/ |
| 435 |
protected function next() |
| 436 |
{ |
| 437 |
$get = $this->get(); |
| 438 |
if ($get === '/') { |
| 439 |
switch ($this->peek()) { |
| 440 |
case '/': |
| 441 |
$this->consumeSingleLineComment(); |
| 442 |
$get = "\n"; |
| 443 |
break; |
| 444 |
case '*': |
| 445 |
$this->consumeMultipleLineComment(); |
| 446 |
$get = ' '; |
| 447 |
break; |
| 448 |
} |
| 449 |
} |
| 450 |
return $get; |
| 451 |
} |
| 452 |
|
| 453 |
protected function isWhiteSpace($s) { |
| 454 |
// https://www.ecma-international.org/ecma-262/#sec-white-space |
| 455 |
return $s !== null && strpos(" \t\v\f", $s) !== false; |
| 456 |
} |
| 457 |
|
| 458 |
protected function isLineTerminator($s) { |
| 459 |
// https://www.ecma-international.org/ecma-262/#sec-line-terminators |
| 460 |
return $s !== null && strpos("\n\r", $s) !== false; |
| 461 |
} |
| 462 |
} |
| 463 |
|
| 464 |
class JSMin_UnterminatedStringException extends Exception {} |
| 465 |
class JSMin_UnterminatedCommentException extends Exception {} |
| 466 |
class JSMin_UnterminatedRegExpException extends Exception {} |
| 467 |
|
