forked from GNUsocial/gnu-social
11c57e7aee
This removes most references to Google, with some remaining since they may point to things which are still relevant. References to Google Code, Google Buzz and Google Maps have been removed
314 lines
11 KiB
PHP
314 lines
11 KiB
PHP
<?php
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/**
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* jsmin.php - PHP implementation of Douglas Crockford's JSMin.
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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 <ryan@wonko.com> (PHP port)
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* @author Steve Clay <steve@mrclay.org> (modifications + cleanup)
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* @author Andrea Giammarchi <http://www.3site.eu> (spaceBeforeRegExp)
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* @copyright 2002 Douglas Crockford <douglas@crockford.com> (jsmin.c)
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* @copyright 2008 Ryan Grove <ryan@wonko.com> (PHP port)
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* @license http://opensource.org/licenses/mit-license.php MIT License
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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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/**
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* Minify Javascript
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*
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* @param string $js Javascript to be minified
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* @return string
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*/
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public static function minify($js)
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{
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$jsmin = new JSMin($js);
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return $jsmin->min();
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}
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/**
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* Setup process
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*/
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public function __construct($input)
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{
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$this->input = str_replace("\r\n", "\n", $input);
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$this->inputLength = strlen($this->input);
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}
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/**
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* Perform minification, return result
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*/
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public function min()
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{
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if ($this->output !== '') { // min already run
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return $this->output;
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}
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$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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} elseif (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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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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'Unterminated String: ' . var_export($str, true));
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}
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$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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'Unterminated RegExp: '. var_export($pattern, true));
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}
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$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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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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* 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 $c;
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}
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/**
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* Get next char. If is ctrl character, translate to a space or newline.
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*/
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protected function peek()
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{
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$this->lookAhead = $this->get();
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return $this->lookAhead;
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}
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/**
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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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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('Unterminated Comment: ' . var_export('/*' . $comment, true));
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}
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$comment .= $get;
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}
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}
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/**
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* Get the next character, skipping over comments.
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* Some comments may be preserved.
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*/
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protected function next()
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{
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$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 '/': return $this->singleLineComment();
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case '*': return $this->multipleLineComment();
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default: return $get;
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}
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}
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}
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class JSMin_UnterminatedStringException extends Exception {}
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class JSMin_UnterminatedCommentException extends Exception {}
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class JSMin_UnterminatedRegExpException extends Exception {}
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