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-<?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 {}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-04 14:48:31 +0000