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<?php
/**
 * Class Minify_CommentPreserver
 * @package Minify
 */

/**
 * Process a string in pieces preserving C-style comments that begin with "/*!"
 *
 * @package Minify
 * @author Stephen Clay <[email protected]>
 */
class Minify_CommentPreserver
{

    /**
     * String to be prepended to each preserved comment
     *
     * @var string
     */
    public static $prepend = "\n";

    /**
     * String to be appended to each preserved comment
     *
     * @var string
     */
    public static $append = "\n";

    /**
     * Process a string outside of C-style comments that begin with "/*!"
     *
     * On each non-empty string outside these comments, the given processor
     * function will be called. The comments will be surrounded by
     * Minify_CommentPreserver::$preprend and Minify_CommentPreserver::$append.
     *
     * @param string $content
     * @param callback $processor function
     * @param array $args array of extra arguments to pass to the processor
     * function (default = array())
     * @return string
     */
    public static function process($content, $processor, $args = array())
    {
        $ret = '';
        while (true) {
            list($beforeComment, $comment, $afterComment) = self::_nextComment($content);
            if ('' !== $beforeComment) {
                $callArgs = $args;
                array_unshift($callArgs, $beforeComment);
                $ret .= call_user_func_array($processor, $callArgs);
            }
            if (false === $comment) {
                break;
            }
            $ret .= $comment;
            $content = $afterComment;
        }

        return $ret;
    }

    /**
     * Extract comments that YUI Compressor preserves.
     *
     * @param string $in input
     *
     * @return array 3 elements are returned. If a YUI comment is found, the
     * 2nd element is the comment and the 1st and 3rd are the surrounding
     * strings. If no comment is found, the entire string is returned as the
     * 1st element and the other two are false.
     */
    private static function _nextComment($in)
    {
        if (false === ($start = strpos($in, '/*!')) || false === ($end = strpos($in, '*/', $start + 3))) {
            return array($in, false, false);
        }

        $beforeComment = substr($in, 0, $start);
        $comment = self::$prepend . '/*!' . substr($in, $start + 3, $end - $start - 1) . self::$append;

        $endChars = (strlen($in) - $end - 2);
        $afterComment = (0 === $endChars) ? '' : substr($in, -$endChars);

        return array($beforeComment, $comment, $afterComment);
    }
}