Beans_Lessc::patternMatch PHP Method

    protected function patternMatch($block, $orderedArgs, $keywordArgs)
    {
        // match the guards if it has them
        // any one of the groups must have all its guards pass for a match
        if (!empty($block->guards)) {
            $groupPassed = false;
            foreach ($block->guards as $guardGroup) {
                foreach ($guardGroup as $guard) {
                    $this->pushEnv();
                    $this->zipSetArgs($block->args, $orderedArgs, $keywordArgs);
                    $negate = false;
                    if ($guard[0] == "negate") {
                        $guard = $guard[1];
                        $negate = true;
                    }
                    $passed = $this->reduce($guard) == self::$TRUE;
                    if ($negate) {
                        $passed = !$passed;
                    }
                    $this->popEnv();
                    if ($passed) {
                        $groupPassed = true;
                    } else {
                        $groupPassed = false;
                        break;
                    }
                }
                if ($groupPassed) {
                    break;
                }
            }
            if (!$groupPassed) {
                return false;
            }
        }
        if (empty($block->args)) {
            return $block->isVararg || empty($orderedArgs) && empty($keywordArgs);
        }
        $remainingArgs = $block->args;
        if ($keywordArgs) {
            $remainingArgs = array();
            foreach ($block->args as $arg) {
                if ($arg[0] == "arg" && isset($keywordArgs[$arg[1]])) {
                    continue;
                }
                $remainingArgs[] = $arg;
            }
        }
        $i = -1;
        // no args
        // try to match by arity or by argument literal
        foreach ($remainingArgs as $i => $arg) {
            switch ($arg[0]) {
                case "lit":
                    if (empty($orderedArgs[$i]) || !$this->eq($arg[1], $orderedArgs[$i])) {
                        return false;
                    }
                    break;
                case "arg":
                    // no arg and no default value
                    if (!isset($orderedArgs[$i]) && !isset($arg[2])) {
                        return false;
                    }
                    break;
                case "rest":
                    $i--;
                    // rest can be empty
                    break 2;
            }
        }
        if ($block->isVararg) {
            return true;
            // not having enough is handled above
        } else {
            $numMatched = $i + 1;
            // greater than becuase default values always match
            return $numMatched >= count($orderedArgs);
        }
    }