PhutilDOMNode.php
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	<?php

	final class PhutilDOMNode extends Phobject {

	private $content;
	private $tagName;
	private $children = array();
	private $attributes = array();
	private $parentNode;
	private $rawHead;
	private $rawTail;

	public function setContent($content) {
	$this->content = $content;
	return $this;
	}

	public function getContent() {
	return $this->content;
	}

	public function isContentNode() {
	return ($this->content !== null);
	}

	public function setTagName($tag_name) {
	$this->tagName = $tag_name;
	return $this;
	}

	public function getTagName() {
	return $this->tagName;
	}

	public function appendChild(PhutilDOMNode $node) {
	$node->parentNode = $this;
	$this->children[] = $node;
	return $this;
	}

	public function getChildren() {
	return $this->children;
	}

	public function getParentNode() {
	return $this->parentNode;
	}

	public function setAttributes(array $attributes) {
	$this->attributes = $attributes;
	return $this;
	}

	public function getAttributes() {
	return $this->attributes;
	}

	public function setRawHead($raw_string) {
	$this->rawHead = $raw_string;
	return $this;
	}

	public function setRawTail($raw_tail) {
	$this->rawTail = $raw_tail;
	return $this;
	}

	public function newRawString() {
	$raw = array();
	$raw[] = $this->rawHead;

	foreach ($this->getChildren() as $child) {
	$raw[] = $child->newRawString();
	}

	$raw[] = $this->rawTail;

	return implode('', $raw);
	}

	public function toDictionary() {
	if ($this->isContentNode()) {
	return array(
	'content' => $this->content,
	);
	} else {
	$children = array();

	foreach ($this->getChildren() as $child) {
	$children[] = $child->toDictionary();
	}

	return array(
	'tag' => $this->getTagName(),
	'attributes' => $this->getAttributes(),
	'children' => $children,
	);
	}
	}

	/**
	* Get a list of the children of a given DOM node, treating unexpected
	* tags as if they were raw content.
	*/
	public function selectChildrenWithTags(array $tag_list) {
	$tag_map = array_fuse($tag_list);

	$nodes = array();
	foreach ($this->getChildren() as $child) {
	// If this is already a content node, just keep it as-is.
	if ($child->isContentNode()) {
	$nodes[] = $child;
	continue;
	}

	$tag_name = $child->getTagName();

	// If this is a tag that we're allowing, keep it as-is.
	if (isset($tag_map[$tag_name])) {
	$nodes[] = $child;
	continue;
	}

	// Otherwise, this is some other tag. Convert it into a content
	// node.

	$raw_string = $child->newRawString();

	$nodes[] = id(new self())
	->setContent($raw_string)
	->setRawHead($raw_string);
	}

	return $this->mergeContentNodes($nodes);
	}

	public function newRawContentString() {
	$content_node = $this->selectChildrenWithTags(array());

	if (!$content_node) {
	return '';
	}

	return head($content_node)->newRawString();
	}

	public function mergeContent() {
	$this->children = $this->mergeContentNodes($this->children);

	foreach ($this->getChildren() as $child) {
	$child->parentNode = $this;
	$child->mergeContent();
	}

	return $this;
	}

	/**
	* Given a list of nodes, combine sequences of multiple adjacent content
	* nodes into single nodes.
	*/
	private function mergeContentNodes(array $nodes) {
	$list = array();
	$content_block = array();
	foreach ($nodes as $node) {
	if ($node->isContentNode()) {
	$content_block[] = $node;
	continue;
	}

	$list[] = $content_block;
	$content_block = array();

	$list[] = $node;
	}

	$list[] = $content_block;

	$results = array();
	foreach ($list as $item) {
	if (!is_array($item)) {
	$results[] = $item;
	continue;
	}

	if (!$item) {
	continue;
	}

	$parts = array();
	foreach ($item as $content_node) {
	$parts[] = $content_node->newRawString();
	}
	$parts = implode('', $parts);

	if (!strlen($parts)) {
	continue;
	}

	$results[] = id(new self())
	->setContent($parts)
	->setRawHead($parts);
	}

	return $results;
	}

	}

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