/Plugin/CoreCompiler/lib/JSMin.php
PHP | 437 lines | 270 code | 25 blank | 142 comment | 57 complexity | da47a12a17e5e62a3995367a13197861 MD5 | raw file
- <?php
- /**
- * JSMin.php - modified PHP implementation of Douglas Crockford's JSMin.
- *
- * <code>
- * $minifiedJs = JSMin::minify($js);
- * </code>
- *
- * This is a modified port of jsmin.c. Improvements:
- *
- * Does not choke on some regexp literals containing quote characters. E.g. /'/
- *
- * Spaces are preserved after some add/sub operators, so they are not mistakenly
- * converted to post-inc/dec. E.g. a + ++b -> a+ ++b
- *
- * Preserves multi-line comments that begin with /*!
- *
- * 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 = '';
- protected $lastByteOut = '';
- protected $keptComment = '';
- /**
- * Minify Javascript.
- *
- * @param string $js Javascript to be minified
- *
- * @return string
- */
- public static function minify($js)
- {
- $jsmin = new JSMin($js);
- return $jsmin->min();
- }
- /**
- * @param string $input
- */
- public function __construct($input)
- {
- $this->input = $input;
- }
- /**
- * Perform minification, return result
- *
- * @return string
- */
- public function min()
- {
- if ($this->output !== '') { // min already run
- return $this->output;
- }
- $mbIntEnc = null;
- if (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2)) {
- $mbIntEnc = mb_internal_encoding();
- mb_internal_encoding('8bit');
- }
- $this->input = str_replace("\r\n", "\n", $this->input);
- $this->inputLength = strlen($this->input);
- $this->action(self::ACTION_DELETE_A_B);
- while ($this->a !== null) {
- // determine next command
- $command = self::ACTION_KEEP_A; // default
- if ($this->a === ' ') {
- if (($this->lastByteOut === '+' || $this->lastByteOut === '-')
- && ($this->b === $this->lastByteOut)) {
- // Don't delete this space. If we do, the addition/subtraction
- // could be parsed as a post-increment
- } elseif (! $this->isAlphaNum($this->b)) {
- $command = self::ACTION_DELETE_A;
- }
- } elseif ($this->a === "\n") {
- if ($this->b === ' ') {
- $command = self::ACTION_DELETE_A_B;
- // in case of mbstring.func_overload & 2, must check for null b,
- // otherwise mb_strpos will give WARNING
- } elseif ($this->b === null
- || (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);
- if ($mbIntEnc !== null) {
- mb_internal_encoding($mbIntEnc);
- }
- 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.
- *
- * @param int $command
- * @throws JSMin_UnterminatedRegExpException|JSMin_UnterminatedStringException
- */
- protected function action($command)
- {
- // make sure we don't compress "a + ++b" to "a+++b", etc.
- if ($command === self::ACTION_DELETE_A_B
- && $this->b === ' '
- && ($this->a === '+' || $this->a === '-')) {
- // Note: we're at an addition/substraction operator; the inputIndex
- // will certainly be a valid index
- if ($this->input[$this->inputIndex] === $this->a) {
- // This is "+ +" or "- -". Don't delete the space.
- $command = self::ACTION_KEEP_A;
- }
- }
- switch ($command) {
- case self::ACTION_KEEP_A: // 1
- $this->output .= $this->a;
- if ($this->keptComment) {
- $this->output = rtrim($this->output, "\n");
- $this->output .= $this->keptComment;
- $this->keptComment = '';
- }
- $this->lastByteOut = $this->a;
- // fallthrough intentional
- case self::ACTION_DELETE_A: // 2
- $this->a = $this->b;
- if ($this->a === "'" || $this->a === '"') { // string literal
- $str = $this->a; // in case needed for exception
- for(;;) {
- $this->output .= $this->a;
- $this->lastByteOut = $this->a;
- $this->a = $this->get();
- if ($this->a === $this->b) { // end quote
- break;
- }
- if ($this->isEOF($this->a)) {
- throw new JSMin_UnterminatedStringException(
- "JSMin: Unterminated String at byte {$this->inputIndex}: {$str}");
- }
- $str .= $this->a;
- if ($this->a === '\\') {
- $this->output .= $this->a;
- $this->lastByteOut = $this->a;
- $this->a = $this->get();
- $str .= $this->a;
- }
- }
- }
- // fallthrough intentional
- case self::ACTION_DELETE_A_B: // 3
- $this->b = $this->next();
- if ($this->b === '/' && $this->isRegexpLiteral()) {
- $this->output .= $this->a . $this->b;
- $pattern = '/'; // keep entire pattern in case we need to report it in the exception
- for(;;) {
- $this->a = $this->get();
- $pattern .= $this->a;
- if ($this->a === '[') {
- for(;;) {
- $this->output .= $this->a;
- $this->a = $this->get();
- $pattern .= $this->a;
- if ($this->a === ']') {
- break;
- }
- if ($this->a === '\\') {
- $this->output .= $this->a;
- $this->a = $this->get();
- $pattern .= $this->a;
- }
- if ($this->isEOF($this->a)) {
- throw new JSMin_UnterminatedRegExpException(
- "JSMin: Unterminated set in RegExp at byte "
- . $this->inputIndex .": {$pattern}");
- }
- }
- }
- if ($this->a === '/') { // end pattern
- break; // while (true)
- } elseif ($this->a === '\\') {
- $this->output .= $this->a;
- $this->a = $this->get();
- $pattern .= $this->a;
- } elseif ($this->isEOF($this->a)) {
- throw new JSMin_UnterminatedRegExpException(
- "JSMin: Unterminated RegExp at byte {$this->inputIndex}: {$pattern}");
- }
- $this->output .= $this->a;
- $this->lastByteOut = $this->a;
- }
- $this->b = $this->next();
- }
- // end case ACTION_DELETE_A_B
- }
- }
- /**
- * @return bool
- */
- protected function isRegexpLiteral()
- {
- if (false !== strpos("(,=:[!&|?+-~*{;", $this->a)) {
- // we obviously aren't dividing
- return true;
- }
- if ($this->a === ' ' || $this->a === "\n") {
- $length = strlen($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;
- }
- /**
- * Return the next character from stdin. Watch out for lookahead. If the character is a control character,
- * translate it to a space or linefeed.
- *
- * @return string
- */
- protected function get()
- {
- $c = $this->lookAhead;
- $this->lookAhead = null;
- if ($c === null) {
- // getc(stdin)
- if ($this->inputIndex < $this->inputLength) {
- $c = $this->input[$this->inputIndex];
- $this->inputIndex += 1;
- } else {
- $c = null;
- }
- }
- if (ord($c) >= self::ORD_SPACE || $c === "\n" || $c === null) {
- return $c;
- }
- if ($c === "\r") {
- return "\n";
- }
- return ' ';
- }
- /**
- * Does $a indicate end of input?
- *
- * @param string $a
- * @return bool
- */
- protected function isEOF($a)
- {
- return ord($a) <= self::ORD_LF;
- }
- /**
- * Get next char (without getting it). If is ctrl character, translate to a space or newline.
- *
- * @return string
- */
- protected function peek()
- {
- $this->lookAhead = $this->get();
- return $this->lookAhead;
- }
- /**
- * Return true if the character is a letter, digit, underscore, dollar sign, or non-ASCII character.
- *
- * @param string $c
- *
- * @return bool
- */
- protected function isAlphaNum($c)
- {
- return (preg_match('/^[a-z0-9A-Z_\\$\\\\]$/', $c) || ord($c) > 126);
- }
- /**
- * Consume a single line comment from input (possibly retaining it)
- */
- protected function consumeSingleLineComment()
- {
- $comment = '';
- while (true) {
- $get = $this->get();
- $comment .= $get;
- if (ord($get) <= self::ORD_LF) { // end of line reached
- // if IE conditional comment
- if (preg_match('/^\\/@(?:cc_on|if|elif|else|end)\\b/', $comment)) {
- $this->keptComment .= "/{$comment}";
- }
- return;
- }
- }
- }
- /**
- * Consume a multiple line comment from input (possibly retaining it)
- *
- * @throws JSMin_UnterminatedCommentException
- */
- protected function consumeMultipleLineComment()
- {
- $this->get();
- $comment = '';
- for(;;) {
- $get = $this->get();
- if ($get === '*') {
- if ($this->peek() === '/') { // end of comment reached
- $this->get();
- if (0 === strpos($comment, '!')) {
- // preserved by YUI Compressor
- if (!$this->keptComment) {
- // don't prepend a newline if two comments right after one another
- $this->keptComment = "\n";
- }
- $this->keptComment .= "/*!" . substr($comment, 1) . "*/\n";
- } else if (preg_match('/^@(?:cc_on|if|elif|else|end)\\b/', $comment)) {
- // IE conditional
- $this->keptComment .= "/*{$comment}*/";
- }
- return;
- }
- } elseif ($get === null) {
- throw new JSMin_UnterminatedCommentException(
- "JSMin: Unterminated comment at byte {$this->inputIndex}: /*{$comment}");
- }
- $comment .= $get;
- }
- }
- /**
- * Get the next character, skipping over comments. Some comments may be preserved.
- *
- * @return string
- */
- protected function next()
- {
- $get = $this->get();
- if ($get === '/') {
- switch ($this->peek()) {
- case '/':
- $this->consumeSingleLineComment();
- $get = "\n";
- break;
- case '*':
- $this->consumeMultipleLineComment();
- $get = ' ';
- break;
- }
- }
- return $get;
- }
- }
- class JSMin_UnterminatedStringException extends Exception {}
- class JSMin_UnterminatedCommentException extends Exception {}
- class JSMin_UnterminatedRegExpException extends Exception {}