Flow\Parser::parseIf PHP Метод

    protected function parseIf($token)
    {
        $line = $token->getLine();
        $expr = $this->parseExpression();
        $this->stream->expect(Token::BLOCK_END);
        $body = $this->subparse(array('elseif', 'else', 'endif'));
        $tests = array(array($expr, $body));
        $else = null;
        $end = false;
        while (!$end) {
            switch ($this->stream->next()->getValue()) {
                case 'elseif':
                    $expr = $this->parseExpression();
                    $this->stream->expect(Token::BLOCK_END);
                    $body = $this->subparse(array('elseif', 'else', 'endif'));
                    $tests[] = array($expr, $body);
                    break;
                case 'else':
                    $this->stream->expect(Token::BLOCK_END);
                    $else = $this->subparse(array('endif'));
                    break;
                case 'endif':
                    $this->stream->expect(Token::BLOCK_END);
                    $end = true;
                    break;
                default:
                    throw new SyntaxError('malformed if statement', $token);
                    break;
            }
        }
        return new Node\IfNode($tests, $else, $line);
    }