This patch looks bigger than it is, but it's mostly because
of plumbing.
To implement revert-layer we need not only the cascade origin of the
declaration, but the whole cascade level, plus also the layer order.
In order to do this, encapsulate these two things inside a 32-bit
`CascadePriority` struct and plumb it through the rule tree and so on.
This allows us to remove the packing and unpacking of CascadeLevel,
though I kept the ShadowCascadeOrder limit for now in case we need to
reintroduce it.
Fix `!important` behavior of layers while at it (implementing it in
`CascadeLevel::cmp`, spec quote included since it was tricky to find)
since some revert-layer tests were depending on it.
The style attribute test is failing now, but follow-up commit fixes
it, see spec issue.
In terms of the actual keyword implementation, it's sort of
straight-forward: We implement revert and revert-layer in a shared
way, by storing the cascade priority that reverted it.
Differential Revision: https://phabricator.services.mozilla.com/D133372
This is based off work by smurfd. But this patch doesn't support buttons
both at the left and right, which simplifies a lot the implementation.
Also, clean-up the existing env variables while at it.
Co-authored-by: Nicklas Boman <smurfd@gmail.com>
Differential Revision: https://phabricator.services.mozilla.com/D132073
This bit is taken straight from D73454 (I reviewed it but I guess
another pair of eyes is ok, it's really straight-forward).
Co-authored-by: Nicklas Boman <smurfd@gmail.com>
Differential Revision: https://phabricator.services.mozilla.com/D128679
The only fishy bit is the animation stuff. In particular, there are two places
where we just mint the revert behavior:
* When serializing web-animations keyframes (the custom properties stuff in
declaration_block.rs). That codepath is already not sound and I wanted to
get rid of it in bug 1501530, but what do I know.
* When getting an animation value from a property declaration. At that point
we no longer have the CSS rules that apply to the element to compute the
right revert value handy. It'd also use the wrong style anyway, I think,
given the way StyleBuilder::for_animation works.
We _could_ probably get them out of somewhere, but it seems like a whole lot
of code reinventing the wheel which is probably not useful, and that Blink
and WebKit just cannot implement either since they don't have a rule tree,
so it just doesn't seem worth the churn.
The custom properties code looks a bit different in order to minimize hash
lookups in the common case. FWIW, `revert` for custom properties doesn't seem
very useful either, but oh well.
Differential Revision: https://phabricator.services.mozilla.com/D21877
Once we've parsed the variable references, there is no need to keep an entire HashSet
object around, as all we do is iterate over the values.
Differential Revision: https://phabricator.services.mozilla.com/D11735
It's a bit useless to keep a set of invalid properties if we're going
to use them just to reject lookups into another key. This makes it more
consistent with the cascade / no-references code, and should not change
behavior.
Differential Revision: https://phabricator.services.mozilla.com/D9632
I think it used to be the case that all PropertyDeclaration variants had a
DeclaredValueOwned<T> inside. But that's no longer the case, so this abstraction
seems less useful now.
Differential Revision: https://phabricator.services.mozilla.com/D5978
This more concrete wrapper type can write a prefix the very first time something
is written to it. This allows removing plenty of useless monomorphisations caused
by the former W/SequenceWriter<W> pair of types.
