includes/parser/Parser_DiffTest.php

   1 <?php
   2 /**
   3  * Fake parser that output the difference of two different parsers
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Parser
  22  */
  23
  24 /**
  25  * @ingroup Parser
  26  */
  27 class Parser_DiffTest
  28 {
  29         var $parsers, $conf;
  30         var $shortOutput = false;
  31
  32         var $dtUniqPrefix;
  33
  34         function __construct( $conf ) {
  35                 if ( !isset( $conf['parsers'] ) ) {
  36                         throw new MWException( __METHOD__ . ': no parsers specified' );
  37                 }
  38                 $this->conf = $conf;
  39         }
  40
  41         function init() {
  42                 if ( !is_null( $this->parsers ) ) {
  43                         return;
  44                 }
  45
  46                 global $wgHooks;
  47                 static $doneHook = false;
  48                 if ( !$doneHook ) {
  49                         $doneHook = true;
  50                         $wgHooks['ParserClearState'][] = array( $this, 'onClearState' );
  51                 }
  52                 if ( isset( $this->conf['shortOutput'] ) ) {
  53                         $this->shortOutput = $this->conf['shortOutput'];
  54                 }
  55
  56                 foreach ( $this->conf['parsers'] as $i => $parserConf ) {
  57                         if ( !is_array( $parserConf ) ) {
  58                                 $class = $parserConf;
  59                                 $parserConf = array( 'class' => $parserConf );
  60                         } else {
  61                                 $class = $parserConf['class'];
  62                         }
  63                         $this->parsers[$i] = new $class( $parserConf );
  64                 }
  65         }
  66
  67         function __call( $name, $args ) {
  68                 $this->init();
  69                 $results = array();
  70                 $mismatch = false;
  71                 $lastResult = null;
  72                 $first = true;
  73                 foreach ( $this->parsers as $i => $parser ) {
  74                         $currentResult = call_user_func_array( array( &$this->parsers[$i], $name ), $args );
  75                         if ( $first ) {
  76                                 $first = false;
  77                         } else {
  78                                 if ( is_object( $lastResult ) ) {
  79                                         if ( $lastResult != $currentResult ) {
  80                                                 $mismatch = true;
  81                                         }
  82                                 } else {
  83                                         if ( $lastResult !== $currentResult ) {
  84                                                 $mismatch = true;
  85                                         }
  86                                 }
  87                         }
  88                         $results[$i] = $currentResult;
  89                         $lastResult = $currentResult;
  90                 }
  91                 if ( $mismatch ) {
  92                         if ( count( $results ) == 2 ) {
  93                                 $resultsList = array();
  94                                 foreach ( $this->parsers as $i => $parser ) {
  95                                         $resultsList[] = var_export( $results[$i], true );
  96                                 }
  97                                 $diff = wfDiff( $resultsList[0], $resultsList[1] );
  98                         } else {
  99                                 $diff = '[too many parsers]';
 100                         }
 101                         $msg = "Parser_DiffTest: results mismatch on call to $name\n";
 102                         if ( !$this->shortOutput ) {
 103                                 $msg .= 'Arguments: ' . $this->formatArray( $args ) . "\n";
 104                         }
 105                         $msg .= 'Results: ' . $this->formatArray( $results ) . "\n" .
 106                                 "Diff: $diff\n";
 107                         throw new MWException( $msg );
 108                 }
 109                 return $lastResult;
 110         }
 111
 112         function formatArray( $array ) {
 113                 if ( $this->shortOutput ) {
 114                         foreach ( $array as $key => $value ) {
 115                                 if ( $value instanceof ParserOutput ) {
 116                                         $array[$key] = "ParserOutput: {$value->getText()}";
 117                                 }
 118                         }
 119                 }
 120                 return var_export( $array, true );
 121         }
 122
 123         function setFunctionHook( $id, $callback, $flags = 0 ) {
 124                 $this->init();
 125                 foreach ( $this->parsers as $parser ) {
 126                         $parser->setFunctionHook( $id, $callback, $flags );
 127                 }
 128         }
 129
 130         /**
 131          * @param $parser Parser
 132          * @return bool
 133          */
 134         function onClearState( &$parser ) {
 135                 // hack marker prefixes to get identical output
 136                 if ( !isset( $this->dtUniqPrefix ) ) {
 137                         $this->dtUniqPrefix = $parser->uniqPrefix();
 138                 } else {
 139                         $parser->mUniqPrefix = $this->dtUniqPrefix;
 140                 }
 141                 return true;
 142         }
 143 }