WikiError.php

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<?php
class WikiError {
        function __construct( $message ) {
                wfDeprecated( __METHOD__, '1.17' );
                $this->mMessage = $message;
        }

        function getMessage() {
                return $this->mMessage;
        }

        function toString() {
                return $this->getMessage();
        }

        public static function isError( $object ) {
                wfDeprecated( __METHOD__, '1.17' );
                if ( $object instanceof WikiError ) {
                        return true;
                } elseif ( $object instanceof Status ) {
                        return !$object->isOK();
                } else {
                        return false;
                }
        }
}

class WikiErrorMsg extends WikiError {
        function __construct( $message/*, ... */ ) {
                wfDeprecated( __METHOD__, '1.17' );
                $args = func_get_args();
                array_shift( $args );
                $this->mMessage = wfMsgReal( $message, $args, true );
                $this->mMsgKey = $message;
                $this->mMsgArgs = $args;
        }
        
        function getMessageKey() {
                return $this->mMsgKey;
        }
        
        function getMessageArgs() {
                return $this->mMsgArgs;
        }
}

class WikiXmlError extends WikiError {
        function __construct( $parser, $message = 'XML parsing error', $context = null, $offset = 0 ) {
                wfDeprecated( __METHOD__, '1.17' );
                $this->mXmlError = xml_get_error_code( $parser );
                $this->mColumn = xml_get_current_column_number( $parser );
                $this->mLine = xml_get_current_line_number( $parser );
                $this->mByte = xml_get_current_byte_index( $parser );
                $this->mContext = $this->_extractContext( $context, $offset );
                $this->mMessage = $message;
                xml_parser_free( $parser );
                wfDebug( "WikiXmlError: " . $this->getMessage() . "\n" );
        }

        function getMessage() {
                // '$1 at line $2, col $3 (byte $4): $5',
                return wfMsgHtml( 'xml-error-string',
                        $this->mMessage,
                        $this->mLine,
                        $this->mColumn,
                        $this->mByte . $this->mContext,
                        xml_error_string( $this->mXmlError ) );
        }

        function _extractContext( $context, $offset ) {
                if( is_null( $context ) ) {
                        return null;
                } else {
                        // Hopefully integer overflow will be handled transparently here
                        $inlineOffset = $this->mByte - $offset;
                        return '; "' . substr( $context, $inlineOffset, 16 ) . '"';
                }
        }
}