<?php
namespace Elementor\Core\Utils\ImportExport\Parsers;
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* Originally made by WordPress part of WordPress/Importer.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-regex.php
*
* What was done:
* Reformat of the code.
* Changed text domain.
* Changed methods visibility.
*/
/**
* WXR Parser that uses regular expressions. Fallback for installs without an XML parser.
*/
class WXR_Parser_Regex {
/**
* @var bool
*/
private $has_gzip;
private $authors = [];
private $posts = [];
private $categories = [];
private $tags = [];
private $terms = [];
private $base_url = '';
private $base_blog_url = '';
/**
* @param string $file
*
* @return array|\WP_Error
*/
public function parse( $file ) {
$wxr_version = '';
$in_multiline = false;
$multiline_content = '';
$multiline_tags = [
'item' => [
'posts',
function ( $post ) {
return $this->process_post( $post );
},
],
'wp:category' => [
'categories',
function ( $category ) {
return $this->process_category( $category );
},
],
'wp:tag' => [
'tags',
function ( $tag ) {
return $this->process_tag( $tag );
},
],
'wp:term' => [
'terms',
function ( $term ) {
return $this->process_term( $term );
},
],
];
$fp = $this->fopen( $file, 'r' );
if ( $fp ) {
while ( ! $this->feof( $fp ) ) {
$importline = rtrim( $this->fgets( $fp ) );
if ( ! $wxr_version && preg_match( '|<wp:wxr_version>(\d+\.\d+)</wp:wxr_version>|', $importline, $version ) ) {
$wxr_version = $version[1];
}
if ( false !== strpos( $importline, '<wp:base_site_url>' ) ) {
preg_match( '|<wp:base_site_url>(.*?)</wp:base_site_url>|is', $importline, $url );
$this->base_url = $url[1];
continue;
}
if ( false !== strpos( $importline, '<wp:base_blog_url>' ) ) {
preg_match( '|<wp:base_blog_url>(.*?)</wp:base_blog_url>|is', $importline, $blog_url );
$this->base_blog_url = $blog_url[1];
continue;
} else {
$this->base_blog_url = $this->base_url;
}
if ( false !== strpos( $importline, '<wp:author>' ) ) {
preg_match( '|<wp:author>(.*?)</wp:author>|is', $importline, $author );
$a = $this->process_author( $author[1] );
$this->authors[ $a['author_login'] ] = $a;
continue;
}
foreach ( $multiline_tags as $tag => $handler ) {
// Handle multi-line tags on a singular line.
if ( preg_match( '|<' . $tag . '>(.*?)</' . $tag . '>|is', $importline, $matches ) ) {
$this->{$handler[0]}[] = call_user_func( $handler[1], $matches[1] );
continue;
}
$pos = strpos( $importline, "<$tag>" );
if ( false !== $pos ) {
// Take note of any content after the opening tag.
$multiline_content = trim( substr( $importline, $pos + strlen( $tag ) + 2 ) );
// We don't want to have this line added to `$is_multiline` below.
$importline = '';
$in_multiline = $tag;
continue;
}
$pos = strpos( $importline, "</$tag>" );
if ( false !== $pos ) {
$in_multiline = false;
$multiline_content .= trim( substr( $importline, 0, $pos ) );
$this->{$handler[0]}[] = call_user_func( $handler[1], $multiline_content );
}
}
if ( $in_multiline && $importline ) {
$multiline_content .= $importline . "\n";
}
}
$this->fclose( $fp );
}
if ( ! $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->categories,
'tags' => $this->tags,
'terms' => $this->terms,
'base_url' => $this->base_url,
'base_blog_url' => $this->base_blog_url,
'version' => $wxr_version,
];
}
private function process_category( $category ) {
$term = [
'term_id' => $this->get_tag( $category, 'wp:term_id' ),
'cat_name' => $this->get_tag( $category, 'wp:cat_name' ),
'category_nicename' => $this->get_tag( $category, 'wp:category_nicename' ),
'category_parent' => $this->get_tag( $category, 'wp:category_parent' ),
'category_description' => $this->get_tag( $category, 'wp:category_description' ),
];
$term_meta = $this->process_meta( $category, 'wp:termmeta' );
if ( ! empty( $term_meta ) ) {
$term['termmeta'] = $term_meta;
}
return $term;
}
private function process_tag( $tag ) {
$term = [
'term_id' => $this->get_tag( $tag, 'wp:term_id' ),
'tag_name' => $this->get_tag( $tag, 'wp:tag_name' ),
'tag_slug' => $this->get_tag( $tag, 'wp:tag_slug' ),
'tag_description' => $this->get_tag( $tag, 'wp:tag_description' ),
];
$term_meta = $this->process_meta( $tag, 'wp:termmeta' );
if ( ! empty( $term_meta ) ) {
$term['termmeta'] = $term_meta;
}
return $term;
}
private function process_term( $term ) {
$term_data = [
'term_id' => $this->get_tag( $term, 'wp:term_id' ),
'term_taxonomy' => $this->get_tag( $term, 'wp:term_taxonomy' ),
'slug' => $this->get_tag( $term, 'wp:term_slug' ),
'term_parent' => $this->get_tag( $term, 'wp:term_parent' ),
'term_name' => $this->get_tag( $term, 'wp:term_name' ),
'term_description' => $this->get_tag( $term, 'wp:term_description' ),
];
$term_meta = $this->process_meta( $term, 'wp:termmeta' );
if ( ! empty( $term_meta ) ) {
$term_data['termmeta'] = $term_meta;
}
return $term_data;
}
private function process_meta( $string, $tag ) {
$parsed_meta = [];
preg_match_all( "|<$tag>(.+?)</$tag>|is", $string, $meta );
if ( ! isset( $meta[1] ) ) {
return $parsed_meta;
}
foreach ( $meta[1] as $m ) {
$parsed_meta[] = [
'key' => $this->get_tag( $m, 'wp:meta_key' ),
'value' => $this->get_tag( $m, 'wp:meta_value' ),
];
}
return $parsed_meta;
}
private function process_author( $a ) {
return [
'author_id' => $this->get_tag( $a, 'wp:author_id' ),
'author_login' => $this->get_tag( $a, 'wp:author_login' ),
'author_email' => $this->get_tag( $a, 'wp:author_email' ),
'author_display_name' => $this->get_tag( $a, 'wp:author_display_name' ),
'author_first_name' => $this->get_tag( $a, 'wp:author_first_name' ),
'author_last_name' => $this->get_tag( $a, 'wp:author_last_name' ),
];
}
private function process_post( $post ) {
$normalize_tag_callback = function ( $matches ) {
return $this->normalize_tag( $matches );
};
$post_id = $this->get_tag( $post, 'wp:post_id' );
$post_title = $this->get_tag( $post, 'title' );
$post_date = $this->get_tag( $post, 'wp:post_date' );
$post_date_gmt = $this->get_tag( $post, 'wp:post_date_gmt' );
$comment_status = $this->get_tag( $post, 'wp:comment_status' );
$ping_status = $this->get_tag( $post, 'wp:ping_status' );
$status = $this->get_tag( $post, 'wp:status' );
$post_name = $this->get_tag( $post, 'wp:post_name' );
$post_parent = $this->get_tag( $post, 'wp:post_parent' );
$menu_order = $this->get_tag( $post, 'wp:menu_order' );
$post_type = $this->get_tag( $post, 'wp:post_type' );
$post_password = $this->get_tag( $post, 'wp:post_password' );
$is_sticky = $this->get_tag( $post, 'wp:is_sticky' );
$guid = $this->get_tag( $post, 'guid' );
$post_author = $this->get_tag( $post, 'dc:creator' );
$post_excerpt = $this->get_tag( $post, 'excerpt:encoded' );
$post_excerpt = preg_replace_callback( '|<(/?[A-Z]+)|', $normalize_tag_callback, $post_excerpt );
$post_excerpt = str_replace( '<br>', '<br />', $post_excerpt );
$post_excerpt = str_replace( '<hr>', '<hr />', $post_excerpt );
$post_content = $this->get_tag( $post, 'content:encoded' );
$post_content = preg_replace_callback( '|<(/?[A-Z]+)|', $normalize_tag_callback, $post_content );
$post_content = str_replace( '<br>', '<br />', $post_content );
$post_content = str_replace( '<hr>', '<hr />', $post_content );
$postdata = compact( 'post_id', 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_excerpt', 'post_title', 'status', 'post_name', 'comment_status', 'ping_status', 'guid', 'post_parent', 'menu_order', 'post_type', 'post_password', 'is_sticky' );
$attachment_url = $this->get_tag( $post, 'wp:attachment_url' );
if ( $attachment_url ) {
$postdata['attachment_url'] = $attachment_url;
}
preg_match_all( '|<category domain="([^"]+?)" nicename="([^"]+?)">(.+?)</category>|is', $post, $terms, PREG_SET_ORDER );
foreach ( $terms as $t ) {
$post_terms[] = [
'slug' => $t[2],
'domain' => $t[1],
'name' => str_replace( [ '<![CDATA[', ']]>' ], '', $t[3] ),
];
}
if ( ! empty( $post_terms ) ) {
$postdata['terms'] = $post_terms;
}
preg_match_all( '|<wp:comment>(.+?)</wp:comment>|is', $post, $comments );
$comments = $comments[1];
if ( $comments ) {
foreach ( $comments as $comment ) {
$post_comments[] = [
'comment_id' => $this->get_tag( $comment, 'wp:comment_id' ),
'comment_author' => $this->get_tag( $comment, 'wp:comment_author' ),
'comment_author_email' => $this->get_tag( $comment, 'wp:comment_author_email' ),
'comment_author_IP' => $this->get_tag( $comment, 'wp:comment_author_IP' ),
'comment_author_url' => $this->get_tag( $comment, 'wp:comment_author_url' ),
'comment_date' => $this->get_tag( $comment, 'wp:comment_date' ),
'comment_date_gmt' => $this->get_tag( $comment, 'wp:comment_date_gmt' ),
'comment_content' => $this->get_tag( $comment, 'wp:comment_content' ),
'comment_approved' => $this->get_tag( $comment, 'wp:comment_approved' ),
'comment_type' => $this->get_tag( $comment, 'wp:comment_type' ),
'comment_parent' => $this->get_tag( $comment, 'wp:comment_parent' ),
'comment_user_id' => $this->get_tag( $comment, 'wp:comment_user_id' ),
'commentmeta' => $this->process_meta( $comment, 'wp:commentmeta' ),
];
}
}
if ( ! empty( $post_comments ) ) {
$postdata['comments'] = $post_comments;
}
$post_meta = $this->process_meta( $post, 'wp:postmeta' );
if ( ! empty( $post_meta ) ) {
$postdata['postmeta'] = $post_meta;
}
return $postdata;
}
private function get_tag( $string, $tag ) {
preg_match( "|<$tag.*?>(.*?)</$tag>|is", $string, $return );
if ( isset( $return[1] ) ) {
if ( substr( $return[1], 0, 9 ) == '<![CDATA[' ) {
if ( strpos( $return[1], ']]]]><![CDATA[>' ) !== false ) {
preg_match_all( '|<!\[CDATA\[(.*?)\]\]>|s', $return[1], $matches );
$return = '';
foreach ( $matches[1] as $match ) {
$return .= $match;
}
} else {
$return = preg_replace( '|^<!\[CDATA\[(.*)\]\]>$|s', '$1', $return[1] );
}
} else {
$return = $return[1];
}
} else {
$return = '';
}
return $return;
}
private function normalize_tag( $matches ) {
return '<' . strtolower( $matches[1] );
}
private function fopen( $filename, $mode = 'r' ) {
if ( $this->has_gzip ) {
return gzopen( $filename, $mode );
}
return fopen( $filename, $mode );
}
private function feof( $fp ) {
if ( $this->has_gzip ) {
return gzeof( $fp );
}
return feof( $fp );
}
private function fgets( $fp, $len = 8192 ) {
if ( $this->has_gzip ) {
return gzgets( $fp, $len );
}
return fgets( $fp, $len );
}
private function fclose( $fp ) {
if ( $this->has_gzip ) {
return gzclose( $fp );
}
return fclose( $fp );
}
public function __construct() {
$this->has_gzip = is_callable( 'gzopen' );
}
}