traverse example

public function extract(iterable|string $resource, MessageCatalogue $catalogue): void
    {
        foreach ($this->extractFiles($resource) as $file) {
            $traverser = new NodeTraverser();
            /** @var AbstractVisitor&NodeVisitor $visitor */
            foreach ($this->visitors as $visitor) {
                $visitor->initialize($catalogue, $file, $this->prefix);
                $traverser->addVisitor($visitor);
            }

            $nodes = $this->parser->parse(file_get_contents($file));
            $traverser->traverse($nodes);
        }
    }

    public function setPrefix(string $prefix): void
    {
        $this->prefix = $prefix;
    }

    protected function canBeExtracted(string $file): bool
    {
        return 'php' === pathinfo($file, \PATHINFO_EXTENSION)
            

        throw new \InvalidArgumentException(sprintf('Invalid class given %s', $className));
    }

    private function resolveNames(array $stmts): array
    {
        $nameResolver = new NameResolver();
        $nodeTraverser = new NodeTraverser();
        $nodeTraverser->addVisitor($nameResolver);

        return $nodeTraverser->traverse($stmts);
    }

    private function parseFile(string $filePath): array
    {
        $parser = (new ParserFactory())->create(ParserFactory::PREFER_PHP7);

        return $this->resolveNames($parser->parse(file_get_contents($filePath)));
    }

    /** * @param class-string $entityClass */

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;
    }

    public function subparse($test, bool $dropNeedle = false): Node
    {
        

return false;
                }
            }
            return true;
        };
        switch ($this->operator) {
            case " ":
            case ">":
                $children = $this->operator === ">";
                $matches->map(function D$curNode) use ($filter, $children) {
                    $ret = array();
                    $curNode->traverse(
                        function D$node, $parent) use ($filter, $children, &$ret) {
                            if ($filter($node, $parent)) {
                                $ret[] = array($node, $parent);
                            }
                            if ($children) {
                                return Traverser::DONT_TRAVERSE_CHILD_NODES;
                            }
                        },
                        array(
                            "skipStartingNode" => true,
                            "passParentNode" => true
                        )

    public function traverse(callable $fn, $options = array())
    {
        $traverser = new \Peast\Traverser($options);
        $traverser->addFunction($fn)->traverse($this);
        return $this;
    }
    
    /** * Returns a serializable version of the node * * @return array */
    #[\ReturnTypeWillChange]     public function jsonSerialize()
    {
        

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);
    }

    private function needEscaping(Environment $env)
    {
        if (\count($this->statusStack)) {
            return $this->statusStack[\count($this->statusStack) - 1];
        }

        

 elseif ($type === "VariableDeclaration") {
                if (in_array($n->getKind(), array($n::KIND_LET, $n::KIND_CONST))) {
                    $addBrackets = true;
                }
                return Traverser::DONT_TRAVERSE_CHILD_NODES;
            } elseif (!in_array($type, $optBracketNodes)) {
                return Traverser::DONT_TRAVERSE_CHILD_NODES;
            }
        };
        //Traverse every node but stop whenever the $addBrackets variable becomes true         foreach ($node as $n) {
            $n->traverse($checkFn);
            if ($addBrackets) {
                break;
            }
        }
        return $addBrackets;
    }

    /** * Render node's comments * * @param Syntax\Node\Node $node Node * @param bool $leading False to render trailing comments * @param bool|null $blockContent This paramater can have 3 values: * - null: the node is not a block * - false: the node is an empty block * - true: the node is a block with content * * @return string */