<?php
/**
 * Parse OPML XML files and store in globals.
 *
 * @package WordPress
 * @subpackage Administration
 */

if ( ! defined( 'ABSPATH' ) ) {
    die();
}

/**
 * @global string $opml
 */
global $opml;

/**
 * Starts a new XML tag.
 *
 * Callback function for xml_set_element_handler().
 *
 * @since 0.71
 * @access private
 *
 * @global array $names
 * @global array $urls
 * @global array $targets
 * @global array $descriptions
 * @global array $feeds
 *
 * @param resource $parser   XML Parser resource.
 * @param string   $tag_name XML element name.
 * @param array    $attrs    XML element attributes.
 */
function startElement( $parser, $tag_name, $attrs ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
    global $names, $urls, $targets, $descriptions, $feeds;

    if ( 'OUTLINE' === $tag_name ) {
        $name = '';
        if ( isset( $attrs['TEXT'] ) ) {
            $name = $attrs['TEXT'];
        }
        if ( isset( $attrs['TITLE'] ) ) {
            $name = $attrs['TITLE'];
        }
        $url = '';
        if ( isset( $attrs['URL'] ) ) {
            $url = $attrs['URL'];
        }
        if ( isset( $attrs['HTMLURL'] ) ) {
            $url = $attrs['HTMLURL'];
        }

        // Save the data away.
        $names[]        = $name;
        $urls[]         = $url;
        $targets[]      = $attrs['TARGET'] ?? '';
        $feeds[]        = $attrs['XMLURL'] ?? '';
        $descriptions[] = $attrs['DESCRIPTION'] ?? '';
    } // End if outline.
}

/**
 * Ends a new XML tag.
 *
 * Callback function for xml_set_element_handler().
 *
 * @since 0.71
 * @access private
 *
 * @param resource $parser   XML Parser resource.
 * @param string   $tag_name XML tag name.
 */
function endElement( $parser, $tag_name ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
    // Nothing to do.
}

// Create an XML parser.
if ( ! function_exists( 'xml_parser_create' ) ) {
    wp_trigger_error( '', __( "PHP's XML extension is not available. Please contact your hosting provider to enable PHP's XML extension." ) );
    wp_die( __( "PHP's XML extension is not available. Please contact your hosting provider to enable PHP's XML extension." ) );
}

$xml_parser = xml_parser_create();

// Set the functions to handle opening and closing tags.
xml_set_element_handler( $xml_parser, 'startElement', 'endElement' );

if ( ! xml_parse( $xml_parser, $opml, true ) ) {
    printf(
        /* translators: 1: Error message, 2: Line number. */
        __( 'XML Error: %1$s at line %2$s' ),
        xml_error_string( xml_get_error_code( $xml_parser ) ),
        xml_get_current_line_number( $xml_parser )
    );
}

if ( PHP_VERSION_ID < 80000 ) { // xml_parser_free() has no effect as of PHP 8.0.
    // Free up memory used by the XML parser.
    xml_parser_free( $xml_parser );
}

unset( $xml_parser );