mirror of
https://github.com/vichan-devel/vichan.git
synced 2024-11-30 02:04:35 +01:00
450 lines
15 KiB
PHP
Executable File
450 lines
15 KiB
PHP
Executable 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)) {
|
|
$byte = $this->inputIndex - 1;
|
|
throw new JSMin_UnterminatedStringException(
|
|
"JSMin: Unterminated String at byte {$byte}: {$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)) {
|
|
$byte = $this->inputIndex - 1;
|
|
throw new JSMin_UnterminatedRegExpException(
|
|
"JSMin: Unterminated RegExp at byte {$byte}: {$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;
|
|
}
|
|
|
|
// we have to check for a preceding keyword, and we don't need to pattern
|
|
// match over the whole output.
|
|
$recentOutput = substr($this->output, -10);
|
|
|
|
// check if return/typeof directly precede a pattern without a space
|
|
foreach (array('return', 'typeof') as $keyword) {
|
|
if ($this->a !== substr($keyword, -1)) {
|
|
// certainly wasn't keyword
|
|
continue;
|
|
}
|
|
if (preg_match("~(^|[\\s\\S])" . substr($keyword, 0, -1) . "$~", $recentOutput, $m)) {
|
|
if ($m[1] === '' || !$this->isAlphaNum($m[1])) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
// check all keywords
|
|
if ($this->a === ' ' || $this->a === "\n") {
|
|
if (preg_match('~(^|[\\s\\S])(?:case|else|in|return|typeof)$~', $recentOutput, $m)) {
|
|
if ($m[1] === '' || !$this->isAlphaNum($m[1])) {
|
|
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 {}
|