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<?php
/**
* MediaWiki error classes
*
* Copyright © 2005 Brion Vibber <brion@pobox.com>
* http://www.mediawiki.org/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Since PHP4 doesn't have exceptions, here's some error objects
* loosely modeled on the standard PEAR_Error model...
* @ingroup Exception
*/
class WikiError {
/**
* @param $message string
*/
function __construct( $message ) {
$this->mMessage = $message;
}
/**
* @return string Plaintext error message to display
*/
function getMessage() {
return $this->mMessage;
}
/**
* In following PEAR_Error model this could be formatted differently,
* but so far it's not.
* @return string
*/
function toString() {
return $this->getMessage();
}
/**
* Returns true if the given object is a WikiError-descended
* error object, false otherwise.
*
* @param $object mixed
* @return bool
*/
public static function isError( $object ) {
if ( $object instanceof WikiError ) {
return true;
} elseif ( $object instanceof Status ) {
return !$object->isOK();
} else {
return false;
}
}
}
/**
* Localized error message object
* @ingroup Exception
*/
class WikiErrorMsg extends WikiError {
/**
* @param $message String: wiki message name
* @param ... parameters to pass to wfMsg()
*/
function __construct( $message/*, ... */ ) {
$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;
}
}
/**
* Error class designed to handle errors involved with
* XML parsing
* @ingroup Exception
*/
class WikiXmlError extends WikiError {
/**
* @param $parser resource
* @param $message string
* @param $context
* @param $offset Int
*/
function __construct( $parser, $message = 'XML parsing error', $context = null, $offset = 0 ) {
$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" );
}
/** @return string */
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 ) . '"';
}
}
}
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