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<?php declare(strict_types=1);
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namespace PhpParser;
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use PhpParser\NodeVisitor\FindingVisitor;
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use PhpParser\NodeVisitor\FirstFindingVisitor;
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class NodeFinder
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{
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/**
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* Find all nodes satisfying a filter callback.
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*
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* @param Node|Node[] $nodes Single node or array of nodes to search in
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* @param callable $filter Filter callback: function(Node $node) : bool
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*
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* @return Node[] Found nodes satisfying the filter callback
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*/
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public function find($nodes, callable $filter) : array {
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if (!is_array($nodes)) {
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$nodes = [$nodes];
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}
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$visitor = new FindingVisitor($filter);
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$traverser = new NodeTraverser;
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$traverser->addVisitor($visitor);
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$traverser->traverse($nodes);
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return $visitor->getFoundNodes();
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}
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/**
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* Find all nodes that are instances of a certain class.
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*
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* @param Node|Node[] $nodes Single node or array of nodes to search in
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* @param string $class Class name
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*
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* @return Node[] Found nodes (all instances of $class)
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*/
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public function findInstanceOf($nodes, string $class) : array {
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return $this->find($nodes, function ($node) use ($class) {
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return $node instanceof $class;
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});
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}
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/**
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* Find first node satisfying a filter callback.
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*
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* @param Node|Node[] $nodes Single node or array of nodes to search in
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* @param callable $filter Filter callback: function(Node $node) : bool
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*
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* @return null|Node Found node (or null if none found)
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*/
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public function findFirst($nodes, callable $filter) {
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if (!is_array($nodes)) {
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$nodes = [$nodes];
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}
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$visitor = new FirstFindingVisitor($filter);
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$traverser = new NodeTraverser;
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$traverser->addVisitor($visitor);
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$traverser->traverse($nodes);
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return $visitor->getFoundNode();
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}
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/**
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* Find first node that is an instance of a certain class.
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*
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* @param Node|Node[] $nodes Single node or array of nodes to search in
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* @param string $class Class name
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*
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* @return null|Node Found node, which is an instance of $class (or null if none found)
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*/
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public function findFirstInstanceOf($nodes, string $class) {
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return $this->findFirst($nodes, function ($node) use ($class) {
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return $node instanceof $class;
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});
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}
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}
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