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