includes/WikiError.php

   1 <?php
   2 /**
   3  * MediaWiki error classes
   4  * Copyright (C) 2005 Brion Vibber <brion@pobox.com>
   5  * http://www.mediawiki.org/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  */
  23
  24 /**
  25  * Since PHP4 doesn't have exceptions, here's some error objects
  26  * loosely modeled on the standard PEAR_Error model...
  27  * @ingroup Exception
  28  */
  29 class WikiError {
  30         /**
  31          * @param $message string
  32          */
  33         function __construct( $message ) {
  34                 $this->mMessage = $message;
  35         }
  36
  37         /**
  38          * @return string Plaintext error message to display
  39          */
  40         function getMessage() {
  41                 return $this->mMessage;
  42         }
  43
  44         /**
  45          * In following PEAR_Error model this could be formatted differently,
  46          * but so far it's not.
  47          * @return string
  48          */
  49         function toString() {
  50                 return $this->getMessage();
  51         }
  52
  53         /**
  54          * Returns true if the given object is a WikiError-descended
  55          * error object, false otherwise.
  56          *
  57          * @param $object mixed
  58          * @return bool
  59          */
  60         public static function isError( $object ) {
  61                 return $object instanceof WikiError;
  62         }
  63 }
  64
  65 /**
  66  * Localized error message object
  67  * @ingroup Exception
  68  */
  69 class WikiErrorMsg extends WikiError {
  70         /**
  71          * @param $message String: wiki message name
  72          * @param ... parameters to pass to wfMsg()
  73          */
  74         function WikiErrorMsg( $message/*, ... */ ) {
  75                 $args = func_get_args();
  76                 array_shift( $args );
  77                 $this->mMessage = wfMsgReal( $message, $args, true );
  78                 $this->mMsgKey = $message;
  79                 $this->mMsgArgs = $args;
  80         }
  81
  82         function getMessageKey() {
  83                 return $this->mMsgKey;
  84         }
  85
  86         function getMessageArgs() {
  87                 return $this->mMsgArgs;
  88         }
  89 }
  90
  91 /**
  92  * Error class designed to handle errors involved with
  93  * XML parsing
  94  * @ingroup Exception
  95  */
  96 class WikiXmlError extends WikiError {
  97         /**
  98          * @param $parser resource
  99          * @param $message string
 100          * @param $context
 101          * @param $offset Int
 102          */
 103         function WikiXmlError( $parser, $message = 'XML parsing error', $context = null, $offset = 0 ) {
 104                 $this->mXmlError = xml_get_error_code( $parser );
 105                 $this->mColumn = xml_get_current_column_number( $parser );
 106                 $this->mLine = xml_get_current_line_number( $parser );
 107                 $this->mByte = xml_get_current_byte_index( $parser );
 108                 $this->mContext = $this->_extractContext( $context, $offset );
 109                 $this->mMessage = $message;
 110                 xml_parser_free( $parser );
 111                 wfDebug( "WikiXmlError: " . $this->getMessage() . "\n" );
 112         }
 113
 114         /** @return string */
 115         function getMessage() {
 116                 // '$1 at line $2, col $3 (byte $4): $5',
 117                 return wfMsgHtml( 'xml-error-string',
 118                         $this->mMessage,
 119                         $this->mLine,
 120                         $this->mColumn,
 121                         $this->mByte . $this->mContext,
 122                         xml_error_string( $this->mXmlError ) );
 123         }
 124
 125         function _extractContext( $context, $offset ) {
 126                 if( is_null( $context ) ) {
 127                         return null;
 128                 } else {
 129                         // Hopefully integer overflow will be handled transparently here
 130                         $inlineOffset = $this->mByte - $offset;
 131                         return '; "' . substr( $context, $inlineOffset, 16 ) . '"';
 132                 }
 133         }
 134 }