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Diffstat (limited to 'vendors/min/lib/JSMin.php')
| -rw-r--r-- | vendors/min/lib/JSMin.php | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/vendors/min/lib/JSMin.php b/vendors/min/lib/JSMin.php new file mode 100644 index 000000000..770e1c610 --- /dev/null +++ b/vendors/min/lib/JSMin.php @@ -0,0 +1,314 @@ +<?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. + * + * 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; + const ACTION_KEEP_A = 1; + const ACTION_DELETE_A = 2; + const ACTION_DELETE_A_B = 3; + + protected $a = "\n"; + 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 $jsmin->min(); + } + + /** + * Setup process + */ + public function __construct($input) + { + $this->input = str_replace("\r\n", "\n", $input); + $this->inputLength = strlen($this->input); + } + + /** + * Perform minification, return result + */ + public function min() + { + if ($this->output !== '') { // min already run + return $this->output; + } + $this->action(self::ACTION_DELETE_A_B); + + while ($this->a !== null) { + // determine next command + $command = self::ACTION_KEEP_A; // default + if ($this->a === ' ') { + if (! $this->isAlphaNum($this->b)) { + $command = self::ACTION_DELETE_A; + } + } elseif ($this->a === "\n") { + if ($this->b === ' ') { + $command = self::ACTION_DELETE_A_B; + } elseif (false === strpos('{[(+-', $this->b) + && ! $this->isAlphaNum($this->b)) { + $command = self::ACTION_DELETE_A; + } + } elseif (! $this->isAlphaNum($this->a)) { + if ($this->b === ' ' + || ($this->b === "\n" + && (false === strpos('}])+-"\'', $this->a)))) { + $command = self::ACTION_DELETE_A_B; + } + } + $this->action($command); + } + $this->output = trim($this->output); + return $this->output; + } + + /** + * ACTION_KEEP_A = Output A. Copy B to A. Get the next B. + * ACTION_DELETE_A = Copy B to A. Get the next B. + * ACTION_DELETE_A_B = Get the next B. + */ + protected function action($command) + { + switch ($command) { + case self::ACTION_KEEP_A: + $this->output .= $this->a; + // fallthrough + case self::ACTION_DELETE_A: + $this->a = $this->b; + if ($this->a === "'" || $this->a === '"') { // string literal + $str = $this->a; // in case needed for exception + while (true) { + $this->output .= $this->a; + $this->a = $this->get(); + if ($this->a === $this->b) { // end quote + break; + } + if (ord($this->a) <= self::ORD_LF) { + throw new JSMin_UnterminatedStringException( + 'Unterminated String: ' . var_export($str, true)); + } + $str .= $this->a; + if ($this->a === '\\') { + $this->output .= $this->a; + $this->a = $this->get(); + $str .= $this->a; + } + } + } + // fallthrough + case self::ACTION_DELETE_A_B: + $this->b = $this->next(); + if ($this->b === '/' && $this->isRegexpLiteral()) { // RegExp literal + $this->output .= $this->a . $this->b; + $pattern = '/'; // in case needed for exception + while (true) { + $this->a = $this->get(); + $pattern .= $this->a; + if ($this->a === '/') { // end pattern + break; // while (true) + } elseif ($this->a === '\\') { + $this->output .= $this->a; + $this->a = $this->get(); + $pattern .= $this->a; + } elseif (ord($this->a) <= self::ORD_LF) { + throw new JSMin_UnterminatedRegExpException( + 'Unterminated RegExp: '. var_export($pattern, true)); + } + $this->output .= $this->a; + } + $this->b = $this->next(); + } + // end case ACTION_DELETE_A_B + } + } + + protected function isRegexpLiteral() + { + if (false !== strpos("\n{;(,=:[!&|?", $this->a)) { // we aren't dividing + return true; + } + if (' ' === $this->a) { + $length = strlen($this->output); + if ($length < 2) { // weird edge case + return true; + } + // you can't divide a keyword + if (preg_match('/(?:case|else|in|return|typeof)$/', $this->output, $m)) { + if ($this->output === $m[0]) { // odd but could happen + return true; + } + // make sure it's a keyword, not end of an identifier + $charBeforeKeyword = substr($this->output, $length - strlen($m[0]) - 1, 1); + if (! $this->isAlphaNum($charBeforeKeyword)) { + return true; + } + } + } + return false; + } + + /** + * Get next char. Convert ctrl char to space. + */ + protected function get() + { + $c = $this->lookAhead; + $this->lookAhead = null; + if ($c === null) { + if ($this->inputIndex < $this->inputLength) { + $c = $this->input[$this->inputIndex]; + $this->inputIndex += 1; + } else { + return null; + } + } + if ($c === "\r" || $c === "\n") { + return "\n"; + } + if (ord($c) < self::ORD_SPACE) { // control char + return ' '; + } + return $c; + } + + /** + * Get next char. If is ctrl character, translate to a space or newline. + */ + protected function peek() + { + $this->lookAhead = $this->get(); + return $this->lookAhead; + } + + /** + * Is $c a letter, digit, underscore, dollar sign, escape, or non-ASCII? + */ + protected function isAlphaNum($c) + { + return (preg_match('/^[0-9a-zA-Z_\\$\\\\]$/', $c) || ord($c) > 126); + } + + protected function singleLineComment() + { + $comment = ''; + while (true) { + $get = $this->get(); + $comment .= $get; + if (ord($get) <= self::ORD_LF) { // EOL reached + // if IE conditional comment + if (preg_match('/^\\/@(?:cc_on|if|elif|else|end)\\b/', $comment)) { + return "/{$comment}"; + } + return $get; + } + } + } + + protected function multipleLineComment() + { + $this->get(); + $comment = ''; + while (true) { + $get = $this->get(); + if ($get === '*') { + if ($this->peek() === '/') { // end of comment reached + $this->get(); + // if comment preserved by YUI Compressor + if (0 === strpos($comment, '!')) { + return "\n/*" . substr($comment, 1) . "*/\n"; + } + // if IE conditional comment + if (preg_match('/^@(?:cc_on|if|elif|else|end)\\b/', $comment)) { + return "/*{$comment}*/"; + } + return ' '; + } + } elseif ($get === null) { + throw new JSMin_UnterminatedCommentException('Unterminated Comment: ' . var_export('/*' . $comment, true)); + } + $comment .= $get; + } + } + + /** + * Get the next character, skipping over comments. + * Some comments may be preserved. + */ + protected function next() + { + $get = $this->get(); + if ($get !== '/') { + return $get; + } + switch ($this->peek()) { + case '/': return $this->singleLineComment(); + case '*': return $this->multipleLineComment(); + default: return $get; + } + } +} + +class JSMin_UnterminatedStringException extends Exception {} +class JSMin_UnterminatedCommentException extends Exception {} +class JSMin_UnterminatedRegExpException extends Exception {} |