Re: Global parser not initialized on special pages?

This is expected. You should not make assumptions about the state of the
global Parser instance in a special page. In some circumstances (especially
transclusions) it might be in a parse, other times it won't be.

If you're rendering an i18n message, its better to use ->parse() of the
Message class then to pass it through the parser directly.

Alternatively use
\MediaWiki\MediaWikiServices::getInstance()->getParser()->getFreshParser()
and then initialize it yourself by calling ->parse() on the Parser, so you
always know what the state is for sure.

--
Brian

On Fri, Jun 11, 2021 at 9:27 AM Sebastian Trueg <[email protected]> wrote:

> Hi everyone,
>
> my skin uses the global parser in order to render some parts of the
> navigation bar via templates (Parser::recursivePreprocess). This works
> fine on all normal pages (and even some special ones like
> Special:Version), but not on special pages like Special:AllPages.
>
> Some debugging revealed that on Special:AllPages the global parser
> object (\MediaWiki\MediaWikiServices::getInstance()->getParser()) is not
> properly initialized. Member variables like mOptions and mTitle are null
> which results in tons of NPEs.
>
> Any idea why that is? Is that a bug or am I mis-using the parser?
>
> Regards,
> Sebastian
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