Parser_DiffTest.php

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<?php
class Parser_DiffTest
{
        var $parsers, $conf;
        var $shortOutput = false;

        var $dtUniqPrefix;

        function __construct( $conf ) {
                if ( !isset( $conf['parsers'] ) ) {
                        throw new MWException( __METHOD__ . ': no parsers specified' );
                }
                $this->conf = $conf;
        }

        function init() {
                if ( !is_null( $this->parsers ) ) {
                        return;
                }

                global $wgHooks;
                static $doneHook = false;
                if ( !$doneHook ) {
                        $doneHook = true;
                        $wgHooks['ParserClearState'][] = array( $this, 'onClearState' );
                }
                if ( isset( $this->conf['shortOutput'] ) ) {
                        $this->shortOutput = $this->conf['shortOutput'];
                }

                foreach ( $this->conf['parsers'] as $i => $parserConf ) {
                        if ( !is_array( $parserConf ) ) {
                                $class = $parserConf;
                                $parserConf = array( 'class' => $parserConf );
                        } else {
                                $class = $parserConf['class'];
                        }
                        $this->parsers[$i] = new $class( $parserConf );
                }
        }

        function __call( $name, $args ) {
                $this->init();
                $results = array();
                $mismatch = false;
                $lastResult = null;
                $first = true;
                foreach ( $this->parsers as $i => $parser ) {
                        $currentResult = call_user_func_array( array( &$this->parsers[$i], $name ), $args );
                        if ( $first ) {
                                $first = false;
                        } else {
                                if ( is_object( $lastResult ) ) {
                                        if ( $lastResult != $currentResult ) {
                                                $mismatch = true;
                                        }
                                } else {
                                        if ( $lastResult !== $currentResult ) {
                                                $mismatch = true;
                                        }
                                }
                        }
                        $results[$i] = $currentResult;
                        $lastResult = $currentResult;
                }
                if ( $mismatch ) {
                        if ( count( $results ) == 2 ) {
                                $resultsList = array();
                                foreach ( $this->parsers as $i => $parser ) {
                                        $resultsList[] = var_export( $results[$i], true );
                                }
                                $diff = wfDiff( $resultsList[0], $resultsList[1] );
                        } else {
                                $diff = '[too many parsers]';
                        }
                        $msg = "Parser_DiffTest: results mismatch on call to $name\n";
                        if ( !$this->shortOutput ) {
                                $msg .= 'Arguments: ' . $this->formatArray( $args ) . "\n";
                        }
                        $msg .= 'Results: ' . $this->formatArray( $results ) . "\n" .
                                "Diff: $diff\n";
                        throw new MWException( $msg );
                }
                return $lastResult;
        }

        function formatArray( $array ) {
                if ( $this->shortOutput ) {
                        foreach ( $array as $key => $value ) {
                                if ( $value instanceof ParserOutput ) {
                                        $array[$key] = "ParserOutput: {$value->getText()}";
                                }
                        }
                }
                return var_export( $array, true );
        }

        function setFunctionHook( $id, $callback, $flags = 0 ) {
                $this->init();
                foreach  ( $this->parsers as $parser ) {
                        $parser->setFunctionHook( $id, $callback, $flags );
                }
        }

        function onClearState( &$parser ) {
                // hack marker prefixes to get identical output
                if ( !isset( $this->dtUniqPrefix ) ) {
                        $this->dtUniqPrefix = $parser->uniqPrefix();
                } else {
                        $parser->mUniqPrefix = $this->dtUniqPrefix;
                }
                return true;
        }
}