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;
    }
}