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<?php
/**
* Parser class.
*
* Parses HTML content into a DOM for SEO analysis.
*
* @package SureRank\Inc\Analyzer
*/
namespace SureRank\Inc\Analyzer;
use DOMDocument;
use SureRank\Inc\Traits\Get_Instance;
use WP_Error;
if ( ! defined( 'ABSPATH' ) ) {
exit; // Exit if accessed directly.
}
/**
* Class Parser
*
* Parses HTML content into a DOMDocument, optimized for webpage SEO analysis.
*/
class Parser {
use Get_Instance;
/**
* Parse HTML content.
*
* @param string $html The HTML content to parse.
* @return DOMDocument|WP_Error Parsed DOM or error on critical failure.
*/
public function parse( string $html ) {
libxml_use_internal_errors( true );
$dom = new DOMDocument();
// mb_check_encoding / mb_convert_encoding are not polyfilled by WordPress core,
// so guard them; on hosts without the mbstring extension we skip the UTF-8
// normalisation and let DOMDocument handle the bytes rather than fatalling.
if ( function_exists( 'mb_check_encoding' ) && function_exists( 'mb_convert_encoding' )
&& ! mb_check_encoding( $html, 'UTF-8' ) ) {
$html = mb_convert_encoding( $html, 'UTF-8', 'auto' );
}
if ( ! $html ) {
return new WP_Error(
'parse_failed',
__( 'Failed to parse HTML.', 'surerank' )
);
}
$html = $this->pre_process_html( $html );
if ( ! $html ) {
return new WP_Error(
'parse_failed',
__( 'Failed to pre-process HTML.', 'surerank' )
);
}
$html = $this->pre_process_html( $html );
$success = $dom->loadHTML(
'<?xml encoding="UTF-8">' . $html,
LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD | LIBXML_NOBLANKS | LIBXML_NONET
);
libxml_clear_errors();
if ( ! $success || empty( $dom->childNodes ) ) {
return new WP_Error(
'parse_failed',
__( 'Failed to parse HTML.', 'surerank' )
);
}
return $dom;
}
/**
* Pre-process HTML to replace & with & and add doctype.
*
* @param string $html The raw HTML content.
* @return string Pre-processed HTML.
*/
private function pre_process_html( $html ) {
if ( ! $html ) {
return '';
}
$html = preg_replace( '/&(?![A-Za-z0-9#]{1,7};)/', '&', (string) $html );
if ( ! preg_match( '/<!DOCTYPE html>/i', (string) $html ) ) {
$html = '<!DOCTYPE html><html><body>' . $html . '</body></html>';
}
// Remove handlers and attributes that can cause issues for examples: onerror, onclick, etc.
return (string) preg_replace( '/\s+on[a-z]+="[^"]*"/i', '', (string) $html );
}
}