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wp-content/plugins/wordpress-importer/parsers/class-wxr-parser.php

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+<?php
+/**
+ * WordPress eXtended RSS file parser implementations
+ *
+ * @package WordPress
+ * @subpackage Importer
+ */
+
+/**
+ * WordPress Importer class for managing parsing of WXR files.
+ */
+class WXR_Parser {
+	function parse( $file ) {
+		// Attempt to use proper XML parsers first
+		if ( extension_loaded( 'simplexml' ) ) {
+			$parser = new WXR_Parser_SimpleXML;
+			$result = $parser->parse( $file );
+
+			// If SimpleXML succeeds or this is an invalid WXR file then return the results
+			if ( ! is_wp_error( $result ) || 'SimpleXML_parse_error' != $result->get_error_code() ) {
+				return $result;
+			}
+		} elseif ( extension_loaded( 'xml' ) ) {
+			$parser = new WXR_Parser_XML;
+			$result = $parser->parse( $file );
+
+			// If XMLParser succeeds or this is an invalid WXR file then return the results
+			if ( ! is_wp_error( $result ) || 'XML_parse_error' != $result->get_error_code() ) {
+				return $result;
+			}
+		}
+
+		// We have a malformed XML file, so display the error and fallthrough to regex
+		if ( isset( $result ) && defined( 'IMPORT_DEBUG' ) && IMPORT_DEBUG ) {
+			echo '<pre>';
+			if ( 'SimpleXML_parse_error' == $result->get_error_code() ) {
+				foreach ( $result->get_error_data() as $error ) {
+					echo $error->line . ':' . $error->column . ' ' . esc_html( $error->message ) . "\n";
+				}
+			} elseif ( 'XML_parse_error' == $result->get_error_code() ) {
+				$error = $result->get_error_data();
+				echo $error[0] . ':' . $error[1] . ' ' . esc_html( $error[2] );
+			}
+			echo '</pre>';
+			echo '<p><strong>' . __( 'There was an error when reading this WXR file', 'wordpress-importer' ) . '</strong><br />';
+			echo __( 'Details are shown above. The importer will now try again with a different parser...', 'wordpress-importer' ) . '</p>';
+		}
+
+		// use regular expressions if nothing else available or this is bad XML
+		$parser = new WXR_Parser_Regex;
+		return $parser->parse( $file );
+	}
+}