153 lines
3.8 KiB
PHP
153 lines
3.8 KiB
PHP
<?php
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namespace BookStack\Util;
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use DOMDocument;
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use DOMElement;
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use DOMNode;
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use DOMNodeList;
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use DOMXPath;
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/**
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* HtmlDocument is a thin wrapper around DOMDocument built
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* specifically for loading, querying and generating HTML content.
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*/
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class HtmlDocument
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{
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protected DOMDocument $document;
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protected ?DOMXPath $xpath = null;
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protected int $loadOptions;
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public function __construct(string $partialHtml = '', int $loadOptions = 0)
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{
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libxml_use_internal_errors(true);
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$this->document = new DOMDocument();
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$this->loadOptions = $loadOptions;
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if ($partialHtml) {
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$this->loadPartialHtml($partialHtml);
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}
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}
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/**
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* Load some HTML content that's part of a document (e.g. body content)
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* into the current document.
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*/
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public function loadPartialHtml(string $html): void
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{
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$html = '<?xml encoding="utf-8" ?><body>' . $html . '</body>';
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$this->document->loadHTML($html, $this->loadOptions);
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$this->xpath = null;
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}
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/**
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* Load a complete page of HTML content into the document.
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*/
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public function loadCompleteHtml(string $html): void
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{
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$html = '<?xml encoding="utf-8" ?>' . $html;
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$this->document->loadHTML($html, $this->loadOptions);
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$this->xpath = null;
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}
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/**
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* Start an XPath query on the current document.
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*/
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public function queryXPath(string $expression): DOMNodeList
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{
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if (is_null($this->xpath)) {
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$this->xpath = new DOMXPath($this->document);
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}
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$result = $this->xpath->query($expression);
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if ($result === false) {
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throw new \InvalidArgumentException("XPath query for expression [$expression] failed to execute");
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}
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return $result;
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}
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/**
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* Create a new DOMElement instance within the document.
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*/
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public function createElement(string $localName, string $value = ''): DOMElement
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{
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$element = $this->document->createElement($localName, $value);
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if ($element === false) {
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throw new \InvalidArgumentException("Failed to create element of name [$localName] and value [$value]");
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}
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return $element;
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}
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/**
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* Get an element within the document of the given ID.
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*/
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public function getElementById(string $elementId): ?DOMElement
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{
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return $this->document->getElementById($elementId);
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}
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/**
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* Get the DOMNode that represents the HTML body.
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*/
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public function getBody(): DOMNode
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{
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return $this->document->getElementsByTagName('body')[0];
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}
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/**
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* Get the nodes that are a direct child of the body.
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* This is usually all the content nodes if loaded partially.
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*/
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public function getBodyChildren(): DOMNodeList
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{
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return $this->getBody()->childNodes;
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}
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/**
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* Get the inner HTML content of the body.
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* This is usually all the content if loaded partially.
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*/
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public function getBodyInnerHtml(): string
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{
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$html = '';
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foreach ($this->getBodyChildren() as $child) {
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$html .= $this->document->saveHTML($child);
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}
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return $html;
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}
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/**
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* Get the HTML content of the whole document.
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*/
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public function getHtml(): string
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{
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return $this->document->saveHTML($this->document->documentElement);
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}
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/**
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* Get the inner HTML for the given node.
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*/
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public function getNodeInnerHtml(DOMNode $node): string
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{
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$html = '';
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foreach ($node->childNodes as $childNode) {
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$html .= $this->document->saveHTML($childNode);
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}
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return $html;
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}
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/**
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* Get the outer HTML for the given node.
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*/
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public function getNodeOuterHtml(DOMNode $node): string
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{
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return $this->document->saveHTML($node);
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}
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}
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