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Editing: wxr-parser-xml.php

<?php
namespace Elementor\Core\Utils\ImportExport\Parsers;

use Elementor\Utils;
use WP_Error;

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

/**
 * WordPress eXtended RSS file parser implementations,
 * Originally made by WordPress part of WordPress/Importer.
 * https://plugins.trac.wordpress.org/browser/wordpress-importer/trunk/parsers/class-wxr-parser-xml.php
 *
 * What was done:
 * Reformat of the code.
 * Added PHPDOC.
 * Changed text domain.
 * Added clear() method.
 * Added undeclared class properties.
 * Changed methods visibility.
 */

/**
 * WXR Parser that makes use of the XML Parser PHP extension.
 */
class WXR_Parser_XML {
	private static $wp_tags = [
		'wp:post_id',
		'wp:post_date',
		'wp:post_date_gmt',
		'wp:comment_status',
		'wp:ping_status',
		'wp:attachment_url',
		'wp:status',
		'wp:post_name',
		'wp:post_parent',
		'wp:menu_order',
		'wp:post_type',
		'wp:post_password',
		'wp:is_sticky',
		'wp:term_id',
		'wp:category_nicename',
		'wp:category_parent',
		'wp:cat_name',
		'wp:category_description',
		'wp:tag_slug',
		'wp:tag_name',
		'wp:tag_description',
		'wp:term_taxonomy',
		'wp:term_parent',
		'wp:term_name',
		'wp:term_description',
		'wp:author_id',
		'wp:author_login',
		'wp:author_email',
		'wp:author_display_name',
		'wp:author_first_name',
		'wp:author_last_name',
	];

private static $wp_sub_tags = [
		'wp:comment_id',
		'wp:comment_author',
		'wp:comment_author_email',
		'wp:comment_author_url',
		'wp:comment_author_IP',
		'wp:comment_date',
		'wp:comment_date_gmt',
		'wp:comment_content',
		'wp:comment_approved',
		'wp:comment_type',
		'wp:comment_parent',
		'wp:comment_user_id',
	];

/**
	 * @var string
	 */
	private $wxr_version;

/**
	 * @var string
	 */
	private $cdata;

/**
	 * @var array
	 */
	private $data;

/**
	 * @var array
	 */
	private $sub_data;

/**
	 * @var boolean
	 */
	private $in_post;

/**
	 * @var boolean
	 */
	private $in_tag;

/**
	 * @var boolean
	 */
	private $in_sub_tag;

/**
	 * @var array
	 */
	private $authors;

/**
	 * @var array
	 */
	private $posts;

/**
	 * @var array
	 */
	private $term;

/**
	 * @var array
	 */
	private $category;

/**
	 * @var array
	 */
	private $tag;

/**
	 * @var string
	 */
	private $base_url;

/**
	 * @var string
	 */
	private $base_blog_url;

/**
	 * @param string $file
	 *
	 * @return array|WP_Error
	 */
	public function parse( $file ) {
		$this->clear();

$xml = xml_parser_create( 'UTF-8' );
		xml_parser_set_option( $xml, XML_OPTION_SKIP_WHITE, 1 );
		xml_parser_set_option( $xml, XML_OPTION_CASE_FOLDING, 0 );
		xml_set_object( $xml, $this );

xml_set_character_data_handler( $xml, function ( $parser, $cdata ) {
			$this->cdata( $cdata );
		} );

$tag_open_callback = function ( $parse, $tag, $attr ) {
			$this->tag_open( $tag, $attr );
		};

$tag_close_callback = function ( $parser, $tag ) {
			$this->tag_close( $tag );
		};

xml_set_element_handler( $xml, $tag_open_callback, $tag_close_callback );

if ( ! xml_parse( $xml, Utils::file_get_contents( $file ), true ) ) {
			$current_line = xml_get_current_line_number( $xml );
			$current_column = xml_get_current_column_number( $xml );
			$error_code = xml_get_error_code( $xml );
			$error_string = xml_error_string( $error_code );

return new WP_Error( 'XML_parse_error', 'There was an error when reading this WXR file', [
				$current_line,
				$current_column,
				$error_string,
			] );
		}
		xml_parser_free( $xml );

if ( ! preg_match( '/^\d+\.\d+$/', $this->wxr_version ) ) {
			return new WP_Error( 'WXR_parse_error', esc_html__( 'This does not appear to be a WXR file, missing/invalid WXR version number', 'elementor' ) );
		}

return [
			'authors' => $this->authors,
			'posts' => $this->posts,
			'categories' => $this->category,
			'tags' => $this->tag,
			'terms' => $this->term,
			'base_url' => $this->base_url,
			'base_blog_url' => $this->base_blog_url,
			'version' => $this->wxr_version,
		];
	}

private function tag_open( $tag, $attr ) {
		if ( in_array( $tag, self::$wp_tags ) ) {
			$this->in_tag = substr( $tag, 3 );

return;
		}

if ( in_array( $tag, self::$wp_sub_tags ) ) {
			$this->in_sub_tag = substr( $tag, 3 );

return;
		}

switch ( $tag ) {
			case 'category':
				if ( isset( $attr['domain'], $attr['nicename'] ) ) {
					$this->sub_data['domain'] = $attr['domain'];
					$this->sub_data['slug'] = $attr['nicename'];
				}
				break;
			case 'item':
				$this->in_post = true;
				// No break !!!.
			case 'title':
				if ( $this->in_post ) {
					$this->in_tag = 'post_title';
				}
				break;
			case 'guid':
				$this->in_tag = 'guid';
				break;
			case 'dc:creator':
				$this->in_tag = 'post_author';
				break;
			case 'content:encoded':
				$this->in_tag = 'post_content';
				break;
			case 'excerpt:encoded':
				$this->in_tag = 'post_excerpt';
				break;

case 'wp:term_slug':
				$this->in_tag = 'slug';
				break;
			case 'wp:meta_key':
				$this->in_sub_tag = 'key';
				break;
			case 'wp:meta_value':
				$this->in_sub_tag = 'value';
				break;
		}
	}

private function cdata( $cdata ) {
		if ( ! trim( $cdata ) ) {
			return;
		}

if ( false !== $this->in_tag || false !== $this->in_sub_tag ) {
			$this->cdata .= $cdata;
		} else {
			$this->cdata .= trim( $cdata );
		}
	}

private function tag_close( $tag ) {
		switch ( $tag ) {
			case 'wp:comment':
				unset( $this->sub_data['key'], $this->sub_data['value'] ); // Remove meta sub_data.
				if ( ! empty( $this->sub_data ) ) {
					$this->data['comments'][] = $this->sub_data;
				}
				$this->sub_data = [];
				break;
			case 'wp:commentmeta':
				$this->sub_data['commentmeta'][] = [
					'key' => $this->sub_data['key'],
					'value' => $this->sub_data['value'],
				];
				break;
			case 'category':
				if ( ! empty( $this->sub_data ) ) {
					$this->sub_data['name'] = $this->cdata;
					$this->data['terms'][] = $this->sub_data;
				}
				$this->sub_data = [];
				break;
			case 'wp:postmeta':
				if ( ! empty( $this->sub_data ) ) {
					$this->data['postmeta'][] = $this->sub_data;
				}
				$this->sub_data = [];
				break;
			case 'item':
				$this->posts[] = $this->data;
				$this->data = [];
				break;
			case 'wp:category':
			case 'wp:tag':
			case 'wp:term':
				$n = substr( $tag, 3 );
				array_push( $this->$n, $this->data );
				$this->data = [];
				break;
			case 'wp:termmeta':
				if ( ! empty( $this->sub_data ) ) {
					$this->data['termmeta'][] = $this->sub_data;
				}
				$this->sub_data = [];
				break;
			case 'wp:author':
				if ( ! empty( $this->data['author_login'] ) ) {
					$this->authors[ $this->data['author_login'] ] = $this->data;
				}
				$this->data = [];
				break;
			case 'wp:base_site_url':
				$this->base_url = $this->cdata;
				if ( ! isset( $this->base_blog_url ) ) {
					$this->base_blog_url = $this->cdata;
				}
				break;
			case 'wp:base_blog_url':
				$this->base_blog_url = $this->cdata;
				break;
			case 'wp:wxr_version':
				$this->wxr_version = $this->cdata;
				break;

default:
				if ( $this->in_sub_tag ) {
					$this->sub_data[ $this->in_sub_tag ] = $this->cdata;
					$this->in_sub_tag = false;
				} elseif ( $this->in_tag ) {
					$this->data[ $this->in_tag ] = $this->cdata;
					$this->in_tag = false;
				}
		}

$this->cdata = '';
	}

private function clear() {
		$this->wxr_version = '';

$this->cdata = '';
		$this->data = [];
		$this->sub_data = [];

$this->in_post = false;
		$this->in_tag = false;
		$this->in_sub_tag = false;

$this->authors = [];
		$this->posts = [];
		$this->term = [];
		$this->category = [];
		$this->tag = [];
	}
}