AASTNodeList.php
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	<?php

	final class AASTNodeList
	extends Phobject
	implements Countable, Iterator {

	protected $list;
	protected $tree;
	protected $ids;
	protected $pos;

	protected function __construct() {}

	protected function newList(array $nodes) {
	return self::newFromTreeAndNodes($this->tree, $nodes);
	}

	public function selectDescendantsOfType($type_name) {
	return $this->selectDescendantsOfTypes(array($type_name));
	}

	public function selectDescendantsOfTypes(array $type_names) {
	$results = array();
	foreach ($type_names as $type_name) {
	foreach ($this->list as $id => $node) {
	$results += $node->selectDescendantsOfType($type_name)->getRawNodes();
	}
	}
	return $this->newList($results);
	}

	public function getChildrenByIndex($index) {
	$results = array();
	foreach ($this->list as $id => $node) {
	$child = $node->getChildByIndex($index);
	$results[$child->getID()] = $child;
	}
	return $this->newList($results);
	}

	public function add(AASTNodeList $list) {
	foreach ($list->list as $id => $node) {
	$this->list[$id] = $node;
	}
	$this->ids = array_keys($this->list);
	return $this;
	}

	public function getTokens() {
	$tokens = array();
	foreach ($this->list as $node) {
	$tokens += $node->getTokens();
	}
	return $tokens;
	}

	public function getRawNodes() {
	return $this->list;
	}

	public static function newFromTreeAndNodes(AASTTree $tree, array $nodes) {
	// We could do `assert_instances_of($nodes, 'AASTNode')` here, but doing
	// so imposes an observable performance penalty for linting.

	$obj = new AASTNodeList();
	$obj->tree = $tree;
	$obj->list = $nodes;
	$obj->ids = array_keys($nodes);
	return $obj;
	}

	public static function newFromTree(AASTTree $tree) {
	$obj = new AASTNodeList();
	$obj->tree = $tree;
	$obj->list = array(0 => $tree->getRootNode());
	$obj->ids = array(0 => 0);
	return $obj;
	}


	/* -( Countable )---------------------------------------------------------- */

	#[\ReturnTypeWillChange]
	public function count() {
	return count($this->ids);
	}


	/* -( Iterator )----------------------------------------------------------- */

	#[\ReturnTypeWillChange]
	public function current() {
	return $this->list[$this->key()];
	}

	#[\ReturnTypeWillChange]
	public function key() {
	return $this->ids[$this->pos];
	}

	#[\ReturnTypeWillChange]
	public function next() {
	$this->pos++;
	}

	#[\ReturnTypeWillChange]
	public function rewind() {
	$this->pos = 0;
	}

	#[\ReturnTypeWillChange]
	public function valid() {
	return $this->pos < count($this->ids);
	}

	}

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