LocalizedException.php

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<?php
use MediaWiki\Message\Message;
use MediaWiki\Parser\Sanitizer;
 
class LocalizedException extends Exception implements ILocalizedException {
    protected $messageSpec;
 
    public function __construct( $messageSpec, $code = 0, Throwable $previous = null ) {
        $this->messageSpec = $messageSpec;
 
        // Exception->getMessage() should be in plain English, not localized.
        // So fetch the English version of the message, without local
        // customizations, and make a basic attempt to turn markup into text.
        $msg = $this->getMessageObject()->inLanguage( 'en' )->useDatabase( false )->text();
        $msg = preg_replace( '!</?(var|kbd|samp|code)>!', '"', $msg );
        $msg = Sanitizer::stripAllTags( $msg );
        parent::__construct( $msg, $code, $previous );
    }
 
    public function getMessageObject() {
        return Message::newFromSpecifier( $this->messageSpec );
    }
}