MediaWikiLinkValidator.php

<?php
declare( strict_types = 1 );
 
namespace MediaWiki\Extension\Translate\Validation\Validators;
 
use MediaWiki\Extension\Translate\Validation\MessageValidator;
use MediaWiki\Extension\Translate\Validation\ValidationIssue;
use MediaWiki\Extension\Translate\Validation\ValidationIssues;
use TMessage;
 
class MediaWikiLinkValidator implements MessageValidator {
    public function getIssues( TMessage $message, string $targetLanguage ): ValidationIssues {
        $issues = new ValidationIssues();
 
        $definition = $message->definition();
        $translation = $message->translation();
 
        $links = $this->getLinksMissingInTarget( $definition, $translation );
        if ( $links !== [] ) {
            $issue = new ValidationIssue(
                'links',
                'missing',
                'translate-checks-links-missing',
                [
                    [ 'PARAMS', $links ],
                    [ 'COUNT', count( $links ) ],
                ]
            );
            $issues->add( $issue );
        }
 
        $links = $this->getLinksMissingInTarget( $translation, $definition );
        if ( $links !== [] ) {
            $issue = new ValidationIssue(
                'links',
                'extra',
                'translate-checks-links',
                [
                    [ 'PARAMS', $links ],
                    [ 'COUNT', count( $links ) ],
                ]
            );
            $issues->add( $issue );
        }
 
        return $issues;
    }
 
    private function getLinksMissingInTarget( string $source, string $target ): array {
        global $wgLegalTitleChars;
        $tc = $wgLegalTitleChars . '#%{}';
        $matches = $links = [];
 
        preg_match_all( "/\[\[([{$tc}]+)(\\|(.+?))?]]/sDu", $source, $matches );
        $count = count( $matches[0] );
        for ( $i = 0; $i < $count; $i++ ) {
            $backMatch = preg_quote( $matches[1][$i], '/' );
            if ( preg_match( "/\[\[$backMatch/", $target ) !== 1 ) {
                $links[] = "[[{$matches[1][$i]}{$matches[2][$i]}]]";
            }
        }
 
        return $links;
    }
}