XmlTypeCheck.php

Go to the documentation of this file.

<?php
class XmlTypeCheck {
        public $wellFormed = false;

        public $filterMatch = false;

        public $rootElement = '';

        function __construct( $file, $filterCallback=null ) {
                $this->filterCallback = $filterCallback;
                $this->run( $file );
        }

        public function getRootElement() {
                return $this->rootElement;
        }

        private function run( $fname ) {
                $parser = xml_parser_create_ns( 'UTF-8' );

                // case folding violates XML standard, turn it off
                xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, false );

                xml_set_element_handler( $parser, array( $this, 'rootElementOpen' ), false );

                if ( file_exists( $fname ) ) {
                        $file = fopen( $fname, "rb" );
                        if ( $file ) {
                                do {
                                        $chunk = fread( $file, 32768 );
                                        $ret = xml_parse( $parser, $chunk, feof( $file ) );
                                        if( $ret == 0 ) {
                                                // XML isn't well-formed!
                                                fclose( $file );
                                                xml_parser_free( $parser );
                                                return;
                                        }
                                } while( !feof( $file ) );

                                fclose( $file );
                        }
                }

                $this->wellFormed = true;

                xml_parser_free( $parser );
        }

        private function rootElementOpen( $parser, $name, $attribs ) {
                $this->rootElement = $name;

                if( is_callable( $this->filterCallback ) ) {
                        xml_set_element_handler( $parser, array( $this, 'elementOpen' ), false );
                        $this->elementOpen( $parser, $name, $attribs );
                } else {
                        // We only need the first open element
                        xml_set_element_handler( $parser, false, false );
                }
        }

        private function elementOpen( $parser, $name, $attribs ) {
                if( call_user_func( $this->filterCallback, $name, $attribs ) ) {
                        // Filter hit!
                        $this->filterMatch = true;
                }
        }
}