isMainScope example

final class ImportTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): Node
    {
        $macro = $this->parser->getExpressionParser()->parseExpression();
        $this->parser->getStream()->expect(/* Token::NAME_TYPE */ 5, 'as');
        $var = new AssignNameExpression($this->parser->getStream()->expect(/* Token::NAME_TYPE */ 5)->getValue()$token->getLine());
        $this->parser->getStream()->expect(/* Token::BLOCK_END_TYPE */ 3);

        $this->parser->addImportedSymbol('template', $var->getAttribute('name'));

        return new ImportNode($macro$var$token->getLine()$this->getTag()$this->parser->isMainScope());
    }

    public function getTag(): string
    {
        return 'import';
    }
}
$targets[$name] = $alias;

            if (!$stream->nextIf(/* Token::PUNCTUATION_TYPE */ 9, ',')) {
                break;
            }
        } while (true);

        $stream->expect(/* Token::BLOCK_END_TYPE */ 3);

        $var = new AssignNameExpression($this->parser->getVarName()$token->getLine());
        $node = new ImportNode($macro$var$token->getLine()$this->getTag()$this->parser->isMainScope());

        foreach ($targets as $name => $alias) {
            $this->parser->addImportedSymbol('function', $alias, 'macro_'.$name$var);
        }

        return $node;
    }

    public function getTag(): string
    {
        return 'from';
    }

final class ExtendsTokenParser extends AbstractTokenParser
{
    public function parse(Token $token): Node
    {
        $stream = $this->parser->getStream();

        if ($this->parser->peekBlockStack()) {
            throw new SyntaxError('Cannot use "extend" in a block.', $token->getLine()$stream->getSourceContext());
        } elseif (!$this->parser->isMainScope()) {
            throw new SyntaxError('Cannot use "extend" in a macro.', $token->getLine()$stream->getSourceContext());
        }

        if (null !== $this->parser->getParent()) {
            throw new SyntaxError('Multiple extends tags are forbidden.', $token->getLine()$stream->getSourceContext());
        }
        $this->parser->setParent($this->parser->getExpressionParser()->parseExpression());

        $stream->expect(/* Token::BLOCK_END_TYPE */ 3);

        return new Node();
    }
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