includes/parser/Parser_DiffTest.php

   1 <?php
   2 /**
   3  * Fake parser that output the difference of two different parsers
   4  *
   5  * @file
   6  */
   7
   8 /**
   9  * @ingroup Parser
  10  */
  11 class Parser_DiffTest
  12 {
  13         var $parsers, $conf;
  14         var $shortOutput = false;
  15
  16         var $dtUniqPrefix;
  17
  18         function __construct( $conf ) {
  19                 if ( !isset( $conf['parsers'] ) ) {
  20                         throw new MWException( __METHOD__ . ': no parsers specified' );
  21                 }
  22                 $this->conf = $conf;
  23         }
  24
  25         function init() {
  26                 if ( !is_null( $this->parsers ) ) {
  27                         return;
  28                 }
  29
  30                 global $wgHooks;
  31                 static $doneHook = false;
  32                 if ( !$doneHook ) {
  33                         $doneHook = true;
  34                         $wgHooks['ParserClearState'][] = array( $this, 'onClearState' );
  35                 }
  36                 if ( isset( $this->conf['shortOutput'] ) ) {
  37                         $this->shortOutput = $this->conf['shortOutput'];
  38                 }
  39
  40                 foreach ( $this->conf['parsers'] as $i => $parserConf ) {
  41                         if ( !is_array( $parserConf ) ) {
  42                                 $class = $parserConf;
  43                                 $parserConf = array( 'class' => $parserConf );
  44                         } else {
  45                                 $class = $parserConf['class'];
  46                         }
  47                         $this->parsers[$i] = new $class( $parserConf );
  48                 }
  49         }
  50
  51         function __call( $name, $args ) {
  52                 $this->init();
  53                 $results = array();
  54                 $mismatch = false;
  55                 $lastResult = null;
  56                 $first = true;
  57                 foreach ( $this->parsers as $i => $parser ) {
  58                         $currentResult = call_user_func_array( array( &$this->parsers[$i], $name ), $args );
  59                         if ( $first ) {
  60                                 $first = false;
  61                         } else {
  62                                 if ( is_object( $lastResult ) ) {
  63                                         if ( $lastResult != $currentResult ) {
  64                                                 $mismatch = true;
  65                                         }
  66                                 } else {
  67                                         if ( $lastResult !== $currentResult ) {
  68                                                 $mismatch = true;
  69                                         }
  70                                 }
  71                         }
  72                         $results[$i] = $currentResult;
  73                         $lastResult = $currentResult;
  74                 }
  75                 if ( $mismatch ) {
  76                         if ( count( $results ) == 2 ) {
  77                                 $resultsList = array();
  78                                 foreach ( $this->parsers as $i => $parser ) {
  79                                         $resultsList[] = var_export( $results[$i], true );
  80                                 }
  81                                 $diff = wfDiff( $resultsList[0], $resultsList[1] );
  82                         } else {
  83                                 $diff = '[too many parsers]';
  84                         }
  85                         $msg = "Parser_DiffTest: results mismatch on call to $name\n";
  86                         if ( !$this->shortOutput ) {
  87                                 $msg .= 'Arguments: ' . $this->formatArray( $args ) . "\n";
  88                         }
  89                         $msg .= 'Results: ' . $this->formatArray( $results ) . "\n" .
  90                                 "Diff: $diff\n";
  91                         throw new MWException( $msg );
  92                 }
  93                 return $lastResult;
  94         }
  95
  96         function formatArray( $array ) {
  97                 if ( $this->shortOutput ) {
  98                         foreach ( $array as $key => $value ) {
  99                                 if ( $value instanceof ParserOutput ) {
 100                                         $array[$key] = "ParserOutput: {$value->getText()}";
 101                                 }
 102                         }
 103                 }
 104                 return var_export( $array, true );
 105         }
 106
 107         function setFunctionHook( $id, $callback, $flags = 0 ) {
 108                 $this->init();
 109                 foreach  ( $this->parsers as $parser ) {
 110                         $parser->setFunctionHook( $id, $callback, $flags );
 111                 }
 112         }
 113
 114         function onClearState( &$parser ) {
 115                 // hack marker prefixes to get identical output
 116                 if ( !isset( $this->dtUniqPrefix ) ) {
 117                         $this->dtUniqPrefix = $parser->uniqPrefix();
 118                 } else {
 119                         $parser->mUniqPrefix = $this->dtUniqPrefix;
 120                 }
 121                 return true;
 122         }
 123 }