| 1 |
<?php |
| 2 |
/** |
| 3 |
* Class Minify_CommentPreserver |
| 4 |
* @package Minify |
| 5 |
*/ |
| 6 |
|
| 7 |
/** |
| 8 |
* Process a string in pieces preserving C-style comments that begin with "/*!" |
| 9 |
* |
| 10 |
* @package Minify |
| 11 |
* @author Stephen Clay <[email protected]> |
| 12 |
*/ |
| 13 |
class Minify_CommentPreserver |
| 14 |
{ |
| 15 |
|
| 16 |
/** |
| 17 |
* String to be prepended to each preserved comment |
| 18 |
* |
| 19 |
* @var string |
| 20 |
*/ |
| 21 |
public static $prepend = "\n"; |
| 22 |
|
| 23 |
/** |
| 24 |
* String to be appended to each preserved comment |
| 25 |
* |
| 26 |
* @var string |
| 27 |
*/ |
| 28 |
public static $append = "\n"; |
| 29 |
|
| 30 |
/** |
| 31 |
* Process a string outside of C-style comments that begin with "/*!" |
| 32 |
* |
| 33 |
* On each non-empty string outside these comments, the given processor |
| 34 |
* function will be called. The comments will be surrounded by |
| 35 |
* Minify_CommentPreserver::$preprend and Minify_CommentPreserver::$append. |
| 36 |
* |
| 37 |
* @param string $content |
| 38 |
* @param callback $processor function |
| 39 |
* @param array $args array of extra arguments to pass to the processor |
| 40 |
* function (default = array()) |
| 41 |
* @return string |
| 42 |
*/ |
| 43 |
public static function process($content, $processor, $args = array()) |
| 44 |
{ |
| 45 |
$ret = ''; |
| 46 |
while (true) { |
| 47 |
list($beforeComment, $comment, $afterComment) = self::_nextComment($content); |
| 48 |
if ('' !== $beforeComment) { |
| 49 |
$callArgs = $args; |
| 50 |
array_unshift($callArgs, $beforeComment); |
| 51 |
$ret .= call_user_func_array($processor, $callArgs); |
| 52 |
} |
| 53 |
if (false === $comment) { |
| 54 |
break; |
| 55 |
} |
| 56 |
$ret .= $comment; |
| 57 |
$content = $afterComment; |
| 58 |
} |
| 59 |
|
| 60 |
return $ret; |
| 61 |
} |
| 62 |
|
| 63 |
/** |
| 64 |
* Extract comments that YUI Compressor preserves. |
| 65 |
* |
| 66 |
* @param string $in input |
| 67 |
* |
| 68 |
* @return array 3 elements are returned. If a YUI comment is found, the |
| 69 |
* 2nd element is the comment and the 1st and 3rd are the surrounding |
| 70 |
* strings. If no comment is found, the entire string is returned as the |
| 71 |
* 1st element and the other two are false. |
| 72 |
*/ |
| 73 |
private static function _nextComment($in) |
| 74 |
{ |
| 75 |
if (false === ($start = strpos($in, '/*!')) || false === ($end = strpos($in, '*/', $start + 3))) { |
| 76 |
return array($in, false, false); |
| 77 |
} |
| 78 |
|
| 79 |
$beforeComment = substr($in, 0, $start); |
| 80 |
$comment = self::$prepend . '/*!' . substr($in, $start + 3, $end - $start - 1) . self::$append; |
| 81 |
|
| 82 |
$endChars = (strlen($in) - $end - 2); |
| 83 |
$afterComment = (0 === $endChars) ? '' : substr($in, -$endChars); |
| 84 |
|
| 85 |
return array($beforeComment, $comment, $afterComment); |
| 86 |
} |
| 87 |
} |
| 88 |
|
