plural-comparison.php

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<?php
use CLDRPluralRuleParser\Evaluator;
use MediaWiki\Languages\LanguageNameUtils;
use MediaWiki\MediaWikiServices;
 
// Standard boilerplate to define $IP
if ( getenv( 'MW_INSTALL_PATH' ) !== false ) {
    $IP = getenv( 'MW_INSTALL_PATH' );
} else {
    $IP = __DIR__ . '/../../..';
}
require_once "$IP/maintenance/Maintenance.php";
 
class PluralCompare extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Script for comparing different plural implementations.' );
    }
 
    public function execute() {
        $mwLanguages = $this->loadMediaWiki();
        $gtLanguages = $this->loadGettext();
        $clLanguages = $this->loadCLDR();
 
        $all = MediaWikiServices::getInstance()
            ->getLanguageNameUtils()
            ->getLanguageNames( null, LanguageNameUtils::ALL );
        $allkeys = array_keys( $all + $mwLanguages + $gtLanguages + $clLanguages );
        sort( $allkeys );
 
        $this->output( sprintf( "%12s %3s %3s %4s\n", 'Code', 'MW', 'Get', 'CLDR' ) );
        foreach ( $allkeys as $code ) {
            $mw = isset( $mwLanguages[$code] ) ? '+' : '';
            $gt = isset( $gtLanguages[$code] ) ? '+' : '';
            $cl = isset( $clLanguages[$code] ) ? '+' : '';
 
            if ( $mw === '' ) {
                $fallbacks = Language::getFallbacksFor( $code );
                foreach ( $fallbacks as $fcode ) {
                    if ( $fcode !== 'en' && isset( $mwLanguages[$fcode] ) ) {
                        $mw = '.';
                    }
                }
            }
 
            $error = '';
            if ( substr_count( sprintf( '%s%s%s', $mw, $gt, $cl ), '+' ) > 1 ) {
                $error = $this->tryMatch( $code, $mw, $gtLanguages, $clLanguages );
            }
 
            $this->output( sprintf( "%12s %-3s %-3s %-4s %s\n", $code, $mw, $gt, $cl, $error ) );
        }
    }
 
    protected function tryMatch( $code, $mws, $gtLanguages, $clLanguages ) {
        if ( $mws !== '' ) {
            $mwExp = true;
            $lang = Language::factory( $code );
        } else {
            $mwExp = false;
        }
 
        if ( isset( $gtLanguages[$code] ) ) {
            $gtExp = 'return (int) ' . str_replace( 'n', '$i', $gtLanguages[$code] ) . ';';
        } else {
            $gtExp = false;
        }
 
        $cldrExp = $clLanguages[$code] ?? false;
 
        for ( $i = 0; $i <= 250; $i++ ) {
            $mw = $gt = $cl = '?';
 
            if ( $mwExp ) {
                // @phan-suppress-next-line PhanPossiblyUndeclaredVariable
                $exp = $lang->getCompiledPluralRules();
                $mw = Evaluator::evaluateCompiled( $i, $exp );
            }
 
            if ( $gtExp ) {
                $gt = eval( $gtExp );
            }
 
            if ( $cldrExp ) {
                $cl = Evaluator::evaluate( $i, $cldrExp );
            }
 
            if ( self::comp( $mw, $gt ) && self::comp( $gt, $cl ) && self::comp( $cl, $mw ) ) {
                continue;
            }
 
            return "$i: $mw $gt $cl";
        }
 
        return '';
    }
 
    public static function comp( $a, $b ) {
        return $a === '?' || $b === '?' || $a === $b;
    }
 
    protected function loadPluralFile( $fileName ) {
        $doc = new DOMDocument;
        $doc->load( $fileName );
        $rulesets = $doc->getElementsByTagName( 'pluralRules' );
        $plurals = [];
        foreach ( $rulesets as $ruleset ) {
            $codes = $ruleset->getAttribute( 'locales' );
            $rules = [];
            $ruleElements = $ruleset->getElementsByTagName( 'pluralRule' );
            foreach ( $ruleElements as $elt ) {
                $rules[] = $elt->nodeValue;
            }
            foreach ( explode( ' ', $codes ) as $code ) {
                $plurals[$code] = $rules;
            }
        }
 
        return $plurals;
    }
 
    public function loadCLDR() {
        global $IP;
 
        return $this->loadPluralFile( "$IP/languages/data/plurals.xml" );
    }
 
    public function loadMediaWiki() {
        global $IP;
 
        $rules = $this->loadPluralFile( "$IP/languages/data/plurals.xml" );
        $rulesMW = $this->loadPluralFile( "$IP/languages/data/plurals-mediawiki.xml" );
 
        return array_merge( $rules, $rulesMW );
    }
 
    public function loadGettext() {
        $gtData = file_get_contents( __DIR__ . '/../data/plural-gettext.txt' );
        $gtLanguages = [];
        foreach ( preg_split( '/\n|\r/', $gtData, -1, PREG_SPLIT_NO_EMPTY ) as $line ) {
            list( $code, $rule ) = explode( "\t", $line );
            $rule = preg_replace( '/^.*?plural=/', '', $rule );
            $gtLanguages[$code] = $rule;
        }
 
        return $gtLanguages;
    }
}
 
$maintClass = PluralCompare::class;
require_once RUN_MAINTENANCE_IF_MAIN;