After discussion with Tim. The back-compat stuff here seems pretty
useless -- why can't people with old versions of MediaWiki just keep the
old feature sets, and upgrade MediaWiki to get new features for
extensions? We branch extensions for a reason.
Bug 19093. Previously {{#switch:foo|bar|#default=baz}} would behave
differently from {{#switch:foo|#default|bar=baz}}, even though they'd
behave identically if "#default" was replaced by "foo".
I changed switchObj but not switchHook. In testing, switchObj was the
only method that seemed to be used, and I didn't want to make untested
changes to switchHook, so if that's used, the behavior may remain in
some cases. It seems like code is duplicated between them -- whatever
the difference is, that should probably be factored out.
This passes all existing parser tests for #switch, of which there are
none, so don't blame me if it breaks something. ;)
* Defer loading the bulk of the code until a parser function is actually called. Necessary due to the recent large increase in code size.
* Fixed the total disregard for parser state and object-oriented data flow in ExtParserFunctions::loadRegex().
