91 lines
2.7 KiB
PHP
91 lines
2.7 KiB
PHP
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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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* 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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* 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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* 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 $append = "\n";
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/**
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* Process a string outside of C-style comments that begin with "/*!"
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*
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* On each non-empty string outside these comments, the given processor
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* function will be called. The first "!" will be removed from the
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* preserved comments, and the comments will be surrounded by
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* Minify_CommentPreserver::$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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return $ret;
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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 $in input
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*
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* @return array 3 elements are returned. If a YUI comment is found, the
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* 2nd element is the comment and the 1st and 2nd are the surrounding
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* strings. If no comment is found, the entire string is returned as the
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* 1st element and the other two are false.
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*/
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private static function _nextComment($in)
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{
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if (
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false === ($start = strpos($in, '/*!'))
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|| false === ($end = strpos($in, '*/', $start + 3))
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) {
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return array($in, false, false);
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}
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$ret = array(
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substr($in, 0, $start)
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,self::$prepend . '/*' . substr($in, $start + 3, $end - $start - 1) . self::$append
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);
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$endChars = (strlen($in) - $end - 2);
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$ret[] = (0 === $endChars)
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? ''
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: substr($in, -$endChars);
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return $ret;
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}
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}
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