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<?php |
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/** |
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* Class Minify_CommentPreserver |
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* @package Minify |
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*/ |
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|
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/** |
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* Process a string in pieces preserving C-style comments that begin with "/*!" |
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* |
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* @package Minify |
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* @author Stephen Clay <steve@mrclay.org> |
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*/ |
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class Minify_CommentPreserver |
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{ |
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|
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/** |
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* String to be prepended to each preserved comment |
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* |
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* @var string |
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*/ |
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public static $prepend = "\n"; |
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|
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/** |
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* String to be appended to each preserved comment |
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* |
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* @var string |
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*/ |
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public static $append = "\n"; |
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|
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/** |
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* Process a string outside of C-style comments that begin with "/*!" |
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* |
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* On each non-empty string outside these comments, the given processor |
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* function will be called. The comments will be surrounded by |
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* Minify_CommentPreserver::$preprend and Minify_CommentPreserver::$append. |
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* |
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* @param string $content |
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* @param callback $processor function |
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* @param array $args array of extra arguments to pass to the processor |
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* function (default = array()) |
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* @return string |
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*/ |
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public static function process($content, $processor, $args = array()) |
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{ |
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$ret = ''; |
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while (true) { |
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list($beforeComment, $comment, $afterComment) = self::_nextComment($content); |
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if ('' !== $beforeComment) { |
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$callArgs = $args; |
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array_unshift($callArgs, $beforeComment); |
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$ret .= call_user_func_array($processor, $callArgs); |
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} |
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if (false === $comment) { |
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break; |
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} |
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$ret .= $comment; |
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$content = $afterComment; |
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} |
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|
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return $ret; |
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} |
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|
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/** |
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* Extract comments that YUI Compressor preserves. |
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* |
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* @param string $in input |
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* |
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* @return array 3 elements are returned. If a YUI comment is found, the |
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* 2nd element is the comment and the 1st and 3rd are the surrounding |
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* strings. If no comment is found, the entire string is returned as the |
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* 1st element and the other two are false. |
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*/ |
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private static function _nextComment($in) |
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{ |
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if (false === ($start = strpos($in, '/*!')) || false === ($end = strpos($in, '*/', $start + 3))) { |
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return array($in, false, false); |
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} |
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|
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$beforeComment = substr($in, 0, $start); |
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$comment = self::$prepend . '/*!' . substr($in, $start + 3, $end - $start - 1) . self::$append; |
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|
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$endChars = (strlen($in) - $end - 2); |
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$afterComment = (0 === $endChars) ? '' : substr($in, -$endChars); |
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|
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return array($beforeComment, $comment, $afterComment); |
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} |
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} |
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|
