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* MediaWiki.Commenting.FunctionAnnotations.UnrecognizedAnnotation
Change-Id: I97d67cdecbc4849a5d73a53852a9b8b4b6139d1c
The Cite extension already had a recursion guard around the parsing of
`<references/>`, to prevent another `<ref>` containing `<references/>`
from producing a weirdly nested references list.
When an explicit `<references/>` tag is not included in the page, or
`<ref>` tags exist after the last explicit `<references/>`, the extension
automatically adds a reference list at the end of the page, to make the
references still displayed.
This automatic references list creation was bypassing the recursion
guard, causing the weirdly nested output *and* a PHP Notice from
`mRefs[$group]` becoming undefined. This commit sets the recursion guard
state during that automatic references list creation to prevent this.
Bug: T182929
Change-Id: I87737dcf39a4fc15e119a1090a9c34d6b9633c21
The motivation for this patch is to make the code less complex, better
readable, and less brittle.
Example:
public function onExampleHook( Parser &$parser, array &$result ) {
/* This is the hook handler */
}
In this example the $result array is meant to be manipulated by the
hook handler. Changes should become visible to the caller. Since PHP
passes arrays by value, the & is needed to make this possible.
But the & is misplaced in pretty much all cases where the parameter is
an object. The only reason we still see these & in many hook handlers
is historical: PHP 4 passed objects by value, which potentially caused
expensive cloning. This was prevented with the &.
Since PHP 5 objects are passed by reference. However, this did not
made the & entirely meaningless. Keeping the & means callees are
allowed to replace passed objects with new ones. The & makes it look
like a function might intentionally replace a passed object, which is
unintended and actually scary in cases like the Parser. Luckily all
Hooks::run I have seen so far ignore unintended out-values. So even if
a hook handler tries to do something bad like replacing the Parser
with a different one, this would not have an effect.
Removing the & does not remove the possibility to manipulate the
object. Changes done to public properties are still visible to the
caller.
Unfortunately these & cannot be removed from the callers as long as
there is a single callee expecting a reference. This patch reduces the
number of such problematic callees.
Change-Id: Ib3a9da257b50326d569ab1973b523c952963c16b
This is the default for many years now. Returning true does nothing. It's
identical to returning nothing (null). The only meaningful value a hook
handler can return is false, and even this is meaningful only for very
few hooks.
TL;DR: A "return true" in a hook handler is always meaningless, dead code.
I'm interested in this because we (WMDE) might start working on this
extension soon and I want the code to be small and easy to maintain.
Change-Id: If4f32a55cdc38a3cc8af286d1cca7c0089bbfc43
