315 lines
11 KiB
PHP
315 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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* @link http://code.google.com/p/jsmin-php/
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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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