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Developer Documentation
- Bug fixes for general core bugs in 3.10.x will end 8 November 2021 (12 months).
- Bug fixes for security issues in 3.10.x will end 9 May 2022 (18 months).
- PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
/lib/horde/framework/Horde/ -> Domhtml.php (source)
<?php
/**
* Copyright 2010-2017 Horde LLC (http://www.horde.org/)
*
* See the enclosed file LICENSE for license information (LGPL). If you
* did not receive this file, see http://www.horde.org/licenses/lgpl21.
*
* @category Horde
* @copyright 2010-2017 Horde LLC
* @package Util
* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
*/
/**
* Parse DOM data from HTML strings.
*
* @author Michael Slusarz <slusarz@horde.org>
* @category Horde
* @copyright 2010-2017 Horde LLC
* @package Util
* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
*/
class Horde_Domhtml implements Iterator
{
/**
* DOM object.
*
* @var DOMDocument
*/
public $dom;
/**
* Iterator status.
*
* @var array
*/
protected $_iterator = null;
/**
* Original charset of data.
*
* @var string
*/
protected $_origCharset;
/**
* Encoding tag added to beginning of output.
*
* @var string
*/
protected $_xmlencoding = '';
/**
* Constructor.
*
* @param string $text The text of the HTML document.
* @param string $charset The charset of the HTML document.
*
* @throws Exception
*/
public function __construct($text, $charset = null)
{
if (!extension_loaded('dom')) {
throw new Exception('DOM extension is not available.');
}
// Bug #9616: Make sure we have valid HTML input.
if (!strlen($text)) {
$text = '<html></html>';
}
$old_error = libxml_use_internal_errors(true);
$this->dom = new DOMDocument();
if (is_null($charset)) {
/* If no charset given, charset is whatever libxml tells us the
* encoding should be defaulting to 'iso-8859-1'. */
$this->_loadHTML($text);
$this->_origCharset = $this->dom->encoding
? $this->dom->encoding
: 'iso-8859-1';
} else {
/* Convert/try with UTF-8 first. */
$this->_origCharset = Horde_String::lower($charset);
$this->_xmlencoding = '<?xml encoding="UTF-8"?>';
$this->_loadHTML(
$this->_xmlencoding . Horde_String::convertCharset($text, $charset, 'UTF-8')
);
if ($this->dom->encoding &&
(Horde_String::lower($this->dom->encoding) != 'utf-8')) {
/* Convert charset to what the HTML document says it SHOULD
* be. */
$this->_loadHTML(
Horde_String::convertCharset($text, $charset, $this->dom->encoding)
);
$this->_xmlencoding = '';
}
}
if ($old_error) {
libxml_use_internal_errors(false);
}
/* Sanity checking: make sure we have the documentElement object. */
if (!$this->dom->documentElement) {
$this->dom->appendChild($this->dom->createElement('html'));
}
/* Remove old charset information. */
$xpath = new DOMXPath($this->dom);
$domlist = $xpath->query('/html/head/meta[@http-equiv="content-type"]');
for ($i = $domlist->length; $i > 0; --$i) {
$meta = $domlist->item($i - 1);
$meta->parentNode->removeChild($meta);
}
}
/**
* Returns the HEAD element, or creates one if it doesn't exist.
*
* @return DOMElement HEAD element.
*/
public function getHead()
{
$head = $this->dom->getElementsByTagName('head');
if ($head->length) {
return $head->item(0);
}
$headelt = $this->dom->createElement('head');
$this->dom->documentElement->insertBefore($headelt, $this->dom->documentElement->firstChild);
return $headelt;
}
/**
* Returns the BODY element, or creates one if it doesn't exist.
*
* @since 2.2.0
*
* @return DOMElement BODY element.
*/
public function getBody()
{
$body = $this->dom->getElementsByTagName('body');
if ($body->length) {
return $body->item(0);
}
$bodyelt = $this->dom->createElement('body');
$this->dom->documentElement->appendChild($bodyelt);
return $bodyelt;
}
/**
* Returns the full HTML text in the original charset.
*
* @param array $opts Additional options: (since 2.1.0)
* - charset: (string) Return using this charset. If set but empty, will
* return as currently stored in the DOM object.
* - metacharset: (boolean) If true, will add a META tag containing the
* charset information.
*
* @return string HTML text.
*/
public function returnHtml(array $opts = array())
{
$curr_charset = $this->getCharset();
if (strcasecmp($curr_charset, 'US-ASCII') === 0) {
$curr_charset = 'UTF-8';
}
$charset = array_key_exists('charset', $opts)
? (empty($opts['charset']) ? $curr_charset : $opts['charset'])
: $this->_origCharset;
if (empty($opts['metacharset'])) {
$text = $this->dom->saveHTML();
} else {
/* Add placeholder for META tag. Can't add charset yet because DOM
* extension will alter output if it exists. */
$meta = $this->dom->createElement('meta');
$meta->setAttribute('http-equiv', 'content-type');
$meta->setAttribute('horde_dom_html_charset', '');
$head = $this->getHead();
$head->insertBefore($meta, $head->firstChild);
$text = str_replace(
'horde_dom_html_charset=""',
'content="text/html; charset=' . $charset . '"',
$this->dom->saveHTML()
);
$head->removeChild($meta);
}
if (strcasecmp($curr_charset, $charset) !== 0) {
$text = Horde_String::convertCharset($text, $curr_charset, $charset);
}
if (!$this->_xmlencoding ||
(($pos = strpos($text, $this->_xmlencoding)) === false)) {
return $text;
}
return substr_replace($text, '', $pos, strlen($this->_xmlencoding));
}
/**
* Returns the body text in the original charset.
*
* @return string HTML text.
*/
public function returnBody()
{
$body = $this->getBody();
$text = '';
if ($body->hasChildNodes()) {
foreach ($body->childNodes as $child) {
$text .= $this->dom->saveXML($child);
}
}
return Horde_String::convertCharset($text, 'UTF-8', $this->_origCharset);
}
/**
* Get the charset of the DOM data.
*
* @since 2.1.0
*
* @return string Charset of DOM data.
*/
public function getCharset()
{
return $this->dom->encoding
? $this->dom->encoding
: ($this->_xmlencoding ? 'UTF-8' : $this->_origCharset);
}
/**
* Loads the HTML data.
*
* @param string $html HTML data.
*/
protected function _loadHTML($html)
{
if (version_compare(PHP_VERSION, '5.4', '>=')) {
$mask = defined('LIBXML_PARSEHUGE')
? LIBXML_PARSEHUGE
: 0;
$mask |= defined('LIBXML_COMPACT')
? LIBXML_COMPACT
: 0;
$this->dom->loadHTML($html, $mask);
} else {
$this->dom->loadHTML($html);
}
}
/* Iterator methods. */
/**
*/
> #[ReturnTypeWillChange]
public function current()
{
if ($this->_iterator instanceof DOMDocument) {
return $this->_iterator;
}
$curr = end($this->_iterator);
return $curr['list']->item($curr['i']);
}
/**
*/
> #[ReturnTypeWillChange]
public function key()
{
return 0;
}
/**
*/
> #[ReturnTypeWillChange]
public function next()
{
/* Iterate in the reverse direction through the node list. This allows
* alteration of the original list without breaking things (foreach()
* w/removeChild() may exit iteration after removal is complete. */
if ($this->_iterator instanceof DOMDocument) {
$this->_iterator = array();
$curr = array();
$node = $this->dom;
} elseif (empty($this->_iterator)) {
$this->_iterator = null;
return;
} else {
$curr = &$this->_iterator[count($this->_iterator) - 1];
$node = $curr['list']->item($curr['i']);
}
if (empty($curr['child']) &&
($node instanceof DOMNode) &&
$node->hasChildNodes()) {
$curr['child'] = true;
$this->_iterator[] = array(
'child' => false,
'i' => $node->childNodes->length - 1,
'list' => $node->childNodes
);
} elseif (--$curr['i'] < 0) {
array_pop($this->_iterator);
$this->next();
} else {
$curr['child'] = false;
}
}
/**
*/
> #[ReturnTypeWillChange]
public function rewind()
{
$this->_iterator = $this->dom;
}
/**
*/
> #[ReturnTypeWillChange]
public function valid()
{
return !is_null($this->_iterator);
}
}
