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class-llms-dom-document.php
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class-llms-dom-document.php
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<?php
/**
* A convenient wrapper for the DOMDocument Class
*
* @package LifterLMS/Classes
*
* @since 4.13.0
* @version 4.13.0
*/
defined( 'ABSPATH' ) || exit;
/**
* LLMS_DOM_Document Class
*
* @since 4.13.0
*/
class LLMS_DOM_Document {
/**
* Stores the load method name
*
* @var string
*/
private $load_method = 'load_with_mb_convert_encoding';
/**
* Stores the HTML string to load
*
* @var string
*/
private $source;
/**
* Stores the DOMDocument instance
*
* @var DOMDocument
*/
private $dom;
/**
* Stores loading errors
*
* @var null|WP_Error
*/
private $error;
/**
* This forces DOMDocument to convert non-utf8 characters into HTML entities and without relying on `mb_convert_encoding()`.
*
* @var string
*/
private $utf8_fixer = '<meta id="llms-get-dom-doc-utf-fixer" http-equiv="Content-Type" content="text/html; charset=utf-8">';
/**
* Constructor
*
* @since 4.13.0
*
* @param string $source An HTML string, either a full HTML document or a partial string.
* @return void
*/
public function __construct( $source ) {
if ( ! class_exists( 'DOMDocument' ) ) {
$this->error = new WP_Error( 'llms-dom-document-missing', __( 'DOMDocument not available.', 'lifterlms' ) );
return;
}
/**
* Filters the convert encoding method to be used when loading the source in the DOMDocument
*
* @param boolean $use_mb_convert_encoding Whether or not the convert encoding method should be used when loading the source in the DOMDocument.
* Default is `true`. Requires `mbstring` PHP extension.
*/
$use_mb_convert_encoding = apply_filters( 'llms_dom_document_use_mb_convert_encoding', true );
if ( ! ( $use_mb_convert_encoding && function_exists( 'mb_convert_encoding' ) ) ) {
$this->load_method = 'load_with_meta_utf_fixer';
}
$this->source = $source;
$this->dom = new DOMDocument();
}
/**
* Load the HTML string in the DOMDocument
*
* This function suppresses PHP warnings that would be thrown by DOMDocument when
* loading a partial string or an HTML string with errors.
*
* @since 4.13.0
*
* @return boolean|WP_Error Returns `true` if the source is loaded fine.
* Or an error object when DOMDocument isn't available or an error is encountered during loading.
*/
public function load() {
if ( is_wp_error( $this->error ) && $this->error->has_errors() ) {
return $this->error;
}
// Don't throw or log warnings.
$libxml_state = libxml_use_internal_errors( true );
$this->{$this->load_method}();
// Clear and restore errors.
libxml_clear_errors();
libxml_use_internal_errors( $libxml_state );
return is_wp_error( $this->error ) && $this->error->has_errors() ? $this->error : true;
}
/**
* Returns the DOMDocument
*
* @since 4.13.0
*
* @return DOMDocument Returns an instance of DOMDocument.
*/
public function dom() {
return $this->dom;
}
/**
* Load the HTML string in the DOMDocument using mb_convert_econding
*
* @since 4.13.0
*
* @return void
*/
private function load_with_mb_convert_encoding() {
if ( ! $this->dom->loadHTML( mb_convert_encoding( $this->source, 'HTML-ENTITIES', 'UTF-8' ) ) ) {
$this->error = new WP_Error( 'llms-dom-document-error', __( 'DOMDocument XML Error encountered.', 'lifterlms' ), libxml_get_errors() );
}
}
/**
* Load the HTML string in the DOMDocument using the meta ut8 fixer
*
* @since 4.13.0
*
* @return void
*/
private function load_with_meta_utf_fixer() {
if ( ! $this->dom->loadHTML( $this->utf8_fixer . $this->source ) ) {
$this->error = new WP_Error( 'llms-dom-document-error', __( 'DOMDocument XML Error encountered.', 'lifterlms' ), libxml_get_errors() );
return;
}
// Remove the fixer meta element, if it's not removed it creates invalid HTML5 Markup.
$meta = $this->dom->getElementById( 'llms-get-dom-doc-utf-fixer' );
if ( $meta ) {
$meta->parentNode->removeChild( $meta ); // phpcs:ignore: WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase
}
}
}