187 lines
4.8 KiB
PHP
187 lines
4.8 KiB
PHP
<?php
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namespace SilverStripe\View\Parsers;
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use SilverStripe\Core\Convert;
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use SilverStripe\View\ViewableData;
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use DOMNodeList;
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use DOMXPath;
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use DOMDocument;
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/**
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* This class handles the converting of HTML fragments between a string and a DOMDocument based
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* representation.
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*
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* It's designed to allow dependency injection to replace the standard HTML4 version with one that
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* handles XHTML or HTML5 instead
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*
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* @mixin DOMDocument
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*/
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abstract class HTMLValue extends ViewableData
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{
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public function __construct($fragment = null)
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{
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if ($fragment) {
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$this->setContent($fragment);
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}
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parent::__construct();
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}
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abstract public function setContent($fragment);
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/**
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* @return string
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*/
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public function getContent()
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{
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$document = $this->getDocument();
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if (!$document) {
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return '';
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}
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$doc = clone $document;
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$xp = new DOMXPath($doc);
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// If there's no body, the content is empty string
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if (!$doc->getElementsByTagName('body')->length) {
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return '';
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}
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// saveHTML Percentage-encodes any URI-based attributes. We don't want this, since it interferes with
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// shortcodes. So first, save all the attribute values for later restoration.
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$attrs = [];
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$i = 0;
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foreach ($xp->query('//body//@*') as $attr) {
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$key = "__HTMLVALUE_" . ($i++);
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$attrs[$key] = $attr->value;
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$attr->value = $key;
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}
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// Then, call saveHTML & extract out the content from the body tag
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$res = preg_replace(
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[
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'/^(.*?)<body>/is',
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'/<\/body>(.*?)$/isD',
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],
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'',
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$doc->saveHTML()
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);
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// Then replace the saved attributes with their original versions
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$res = preg_replace_callback('/__HTMLVALUE_(\d+)/', function ($matches) use ($attrs) {
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return Convert::raw2att($attrs[$matches[0]]);
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}, $res);
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// Prevent being encoded as literal utf-8 characters
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// Possible alternative solution: http://stackoverflow.com/questions/2142120/php-encoding-with-domdocument
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$from = mb_convert_encoding(' ', 'utf-8', 'html-entities');
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$res = str_replace($from, ' ', $res);
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return $res;
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}
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/** @see HTMLValue::getContent() */
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public function forTemplate()
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{
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return $this->getContent();
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}
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/** @var DOMDocument */
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private $document = null;
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/** @var bool */
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private $valid = true;
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/**
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* Get the DOMDocument for the passed content
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* @return DOMDocument | false - Return false if HTML not valid, the DOMDocument instance otherwise
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*/
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public function getDocument()
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{
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if (!$this->valid) {
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return false;
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} elseif ($this->document) {
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return $this->document;
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} else {
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$this->document = new DOMDocument('1.0', 'UTF-8');
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$this->document->strictErrorChecking = false;
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$this->document->formatOutput = false;
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return $this->document;
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}
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}
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/**
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* Is this HTMLValue in an errored state?
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* @return bool
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*/
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public function isValid()
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{
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return $this->valid;
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}
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/**
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* @param DOMDocument $document
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*/
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public function setDocument($document)
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{
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$this->document = $document;
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$this->valid = true;
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}
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public function setInvalid()
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{
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$this->document = $this->valid = false;
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}
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/**
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* Pass through any missed method calls to DOMDocument (if they exist)
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* so that HTMLValue can be treated mostly like an instance of DOMDocument
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*
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* @param string $method
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* @param array $arguments
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* @return mixed
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*/
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public function __call($method, $arguments)
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{
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$doc = $this->getDocument();
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if ($doc && method_exists($doc, $method)) {
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return call_user_func_array([$doc, $method], $arguments);
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} else {
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return parent::__call($method, $arguments);
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}
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}
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/**
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* Get the body element, or false if there isn't one (we haven't loaded any content
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* or this instance is in an invalid state)
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*/
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public function getBody()
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{
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$doc = $this->getDocument();
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if (!$doc) {
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return false;
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}
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$body = $doc->getElementsByTagName('body');
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if (!$body->length) {
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return false;
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}
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return $body->item(0);
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}
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/**
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* Make an xpath query against this HTML
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*
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* @param string $query The xpath query string
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* @return DOMNodeList
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*/
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public function query($query)
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{
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$xp = new DOMXPath($this->getDocument());
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return $xp->query($query);
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}
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}
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