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<?php

/**
 * Wordpress shortcode util.
 */
class ShortcodeUtil {

    public static function strposAny($subject, $tokens) {
        $len=strlen($subject);

        for ($i=0; $i<strlen($tokens); $i++) {
            $p=strpos($subject,$tokens[$i]);
            if ($p!==FALSE && $p<$len)
                $len=$p;
        }

        return $len;
    }

    /**
     * Tokenize shortcodes.
     */
    public static function tokenize($text) {
        $tokens=array();
        $text=trim($text);

        while (strlen($text)) {
            $text=trim($text);

            switch ($text[0]) {
                case "[":
                case "]":
                case "=":
                    $tokens[]=$text[0];
                    $text=substr($text,1);
                    break;

                case "'":
                case '"':
                    $p=ShortcodeUtil::strposAny(substr($text,1),"\"'");
                    $tokens[]=substr($text,1,$p);
                    $text=substr($text,$p+2);
                    break;

                default:
                    $p=ShortcodeUtil::strposAny($text," \n\t\"'[]=");
                    $tokens[]=substr($text,0,$p);
                    $text=substr($text,$p);
                    break;
            }
        }

        return $tokens;
    }

    /**
     * Extract shortcodes from text.
     */
    public static function extractShortcodes($text) {
        $res=array();
        preg_match_all("(\[.*?\])",$text,$matches);

        foreach ($matches[0] as $match) {
            $tokens=ShortcodeUtil::tokenize($match);

            if ($tokens[0]!="[")
                throw new Exception("shortcode parse error");

            if ($tokens[sizeof($tokens)-1]!="]")
                throw new Exception("shortcode parse error");

            $tokens=array_slice($tokens,1,sizeof($tokens)-2);
            $attr=array();
            $attr["_"]=$tokens[0];
            $tokens=array_slice($tokens,1);

            $i=0;
            while ($i<sizeof($tokens)) {
                if ($tokens[$i+1]=="=") {
                    $attr[$tokens[$i]]=$tokens[$i+2];
                    $i+=3;
                }

                else {
                    $attr[$tokens[$i]]=TRUE;
                    $i++;
                }
            }

            $res[]=$attr;
        }

        return $res;
    }
}