NodeTraverser example

$filter->setNode('node', $this->getEscaperFilter($type, $node));

        return $filter;
    }

    private function isSafeFor(string $type, Node $expression, Environment $env): bool
    {
        $safe = $this->safeAnalysis->getSafe($expression);

        if (null === $safe) {
            if (null === $this->traverser) {
                $this->traverser = new NodeTraverser($env, [$this->safeAnalysis]);
            }

            $this->safeAnalysis->setSafeVars($this->safeVars);

            $this->traverser->traverse($expression);
            $safe = $this->safeAnalysis->getSafe($expression);
        }

        return \in_array($type, $safe) || \in_array('all', $safe);
    }

    

            if (!$e->getTemplateLine()) {
                $e->setTemplateLine($this->stream->getCurrent()->getLine());
            }

            throw $e;
        }

        $node = new ModuleNode(new BodyNode([$body]), $this->parent, new Node($this->blocks), new Node($this->macros), new Node($this->traits), $this->embeddedTemplates, $stream->getSourceContext());

        $traverser = new NodeTraverser($this->env, $this->visitors);

        $node = $traverser->traverse($node);

        // restore previous stack so previous parse() call can resume working         foreach (array_pop($this->stack) as $key => $val) {
            $this->$key = $val;
        }

        return $node;
    }