includes/WikiError.php

   1 <?php
   2 /**
   3  * MediaWiki error classes
   4  *
   5  * Copyright © 2005 Brion Vibber <brion@pobox.com>
   6  * http://www.mediawiki.org/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  */
  25
  26 /**
  27  * Since PHP4 doesn't have exceptions, here's some error objects
  28  * loosely modeled on the standard PEAR_Error model...
  29  * @ingroup Exception
  30  */
  31 class WikiError {
  32         /**
  33          * @param $message string
  34          */
  35         function __construct( $message ) {
  36                 $this->mMessage = $message;
  37         }
  38
  39         /**
  40          * @return string Plaintext error message to display
  41          */
  42         function getMessage() {
  43                 return $this->mMessage;
  44         }
  45
  46         /**
  47          * In following PEAR_Error model this could be formatted differently,
  48          * but so far it's not.
  49          * @return string
  50          */
  51         function toString() {
  52                 return $this->getMessage();
  53         }
  54
  55         /**
  56          * Returns true if the given object is a WikiError-descended
  57          * error object, false otherwise.
  58          *
  59          * @param $object mixed
  60          * @return bool
  61          */
  62         public static function isError( $object ) {
  63                 if ( $object instanceof WikiError ) {
  64                         return true;
  65                 } elseif ( $object instanceof Status ) {
  66                         return !$object->isOK();
  67                 } else {
  68                         return false;
  69                 }
  70         }
  71 }
  72
  73 /**
  74  * Localized error message object
  75  * @ingroup Exception
  76  */
  77 class WikiErrorMsg extends WikiError {
  78         /**
  79          * @param $message String: wiki message name
  80          * @param ... parameters to pass to wfMsg()
  81          */
  82         function __construct( $message/*, ... */ ) {
  83                 $args = func_get_args();
  84                 array_shift( $args );
  85                 $this->mMessage = wfMsgReal( $message, $args, true );
  86                 $this->mMsgKey = $message;
  87                 $this->mMsgArgs = $args;
  88         }
  89
  90         function getMessageKey() {
  91                 return $this->mMsgKey;
  92         }
  93
  94         function getMessageArgs() {
  95                 return $this->mMsgArgs;
  96         }
  97 }
  98
  99 /**
 100  * Error class designed to handle errors involved with
 101  * XML parsing
 102  * @ingroup Exception
 103  */
 104 class WikiXmlError extends WikiError {
 105         /**
 106          * @param $parser resource
 107          * @param $message string
 108          * @param $context
 109          * @param $offset Int
 110          */
 111         function __construct( $parser, $message = 'XML parsing error', $context = null, $offset = 0 ) {
 112                 $this->mXmlError = xml_get_error_code( $parser );
 113                 $this->mColumn = xml_get_current_column_number( $parser );
 114                 $this->mLine = xml_get_current_line_number( $parser );
 115                 $this->mByte = xml_get_current_byte_index( $parser );
 116                 $this->mContext = $this->_extractContext( $context, $offset );
 117                 $this->mMessage = $message;
 118                 xml_parser_free( $parser );
 119                 wfDebug( "WikiXmlError: " . $this->getMessage() . "\n" );
 120         }
 121
 122         /** @return string */
 123         function getMessage() {
 124                 // '$1 at line $2, col $3 (byte $4): $5',
 125                 return wfMsgHtml( 'xml-error-string',
 126                         $this->mMessage,
 127                         $this->mLine,
 128                         $this->mColumn,
 129                         $this->mByte . $this->mContext,
 130                         xml_error_string( $this->mXmlError ) );
 131         }
 132
 133         function _extractContext( $context, $offset ) {
 134                 if( is_null( $context ) ) {
 135                         return null;
 136                 } else {
 137                         // Hopefully integer overflow will be handled transparently here
 138                         $inlineOffset = $this->mByte - $offset;
 139                         return '; "' . substr( $context, $inlineOffset, 16 ) . '"';
 140                 }
 141         }
 142 }