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Auto merge of #18867 - emilio:parse-hack, r=heycam

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style: Dishonor display: -moz-box if -webkit-box was specified before

This is a compatibility hack that Gecko supports that is apparently important for android.

I want to remove it, but let's see...

See https://bugzilla.mozilla.org/show_bug.cgi?id=1407701 for reference.

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This commit is contained in:
bors-servo 2017-10-14 05:27:51 -05:00 • committed by GitHub
commit 2be76c5fd7
7 changed files with 162 additions and 79 deletions
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125
components/style/properties/declaration_block.rs
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@ -39,6 +39,17 @@ impl AnimationRules {
}
}
/// Whether a given declaration comes from CSS parsing, or from CSSOM.
#[cfg_attr(feature = "gecko", derive(MallocSizeOf))]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub enum DeclarationSource {
/// The declaration was obtained from CSS parsing of sheets and such.
Parsing,
/// The declaration was obtained from CSSOM.
CssOm,
}
/// A declaration [importance][importance].
///
/// [importance]: https://drafts.csswg.org/css-cascade/#importance
@ -378,30 +389,15 @@ impl PropertyDeclarationBlock {
}
}
/// Adds or overrides the declaration for a given property in this block,
/// **except** if an existing declaration for the same property is more
/// important.
/// Adds or overrides the declaration for a given property in this block.
///
/// Always ensures that the property declaration is at the end.
pub fn extend(&mut self, drain: SourcePropertyDeclarationDrain, importance: Importance) {
self.extend_common(drain, importance, false);
}
/// Adds or overrides the declaration for a given property in this block,
/// **even** if an existing declaration for the same property is more
/// important, and reuses the same position in the block.
///
/// Returns whether anything changed.
pub fn extend_reset(&mut self, drain: SourcePropertyDeclarationDrain,
importance: Importance) -> bool {
self.extend_common(drain, importance, true)
}
fn extend_common(
/// See the documentation of `push` to see what impact `source` has when the
/// property is already there.
pub fn extend(
&mut self,
mut drain: SourcePropertyDeclarationDrain,
importance: Importance,
overwrite_more_important_and_reuse_slot: bool,
source: DeclarationSource,
) -> bool {
let all_shorthand_len = match drain.all_shorthand {
AllShorthand::NotSet => 0,
@ -415,10 +411,10 @@ impl PropertyDeclarationBlock {
let mut changed = false;
for decl in &mut drain.declarations {
changed |= self.push_common(
changed |= self.push(
decl,
importance,
overwrite_more_important_and_reuse_slot,
source,
);
}
match drain.all_shorthand {
@ -426,20 +422,20 @@ impl PropertyDeclarationBlock {
AllShorthand::CSSWideKeyword(keyword) => {
for &id in ShorthandId::All.longhands() {
let decl = PropertyDeclaration::CSSWideKeyword(id, keyword);
changed |= self.push_common(
changed |= self.push(
decl,
importance,
overwrite_more_important_and_reuse_slot,
source,
);
}
}
AllShorthand::WithVariables(unparsed) => {
for &id in ShorthandId::All.longhands() {
let decl = PropertyDeclaration::WithVariables(id, unparsed.clone());
changed |= self.push_common(
changed |= self.push(
decl,
importance,
overwrite_more_important_and_reuse_slot,
source,
);
}
}
@ -447,21 +443,24 @@ impl PropertyDeclarationBlock {
changed
}
/// Adds or overrides the declaration for a given property in this block,
/// **except** if an existing declaration for the same property is more
/// important.
/// Adds or overrides the declaration for a given property in this block.
///
/// Ensures that, if inserted, it's inserted at the end of the declaration
/// Depending on the value of `source`, this has a different behavior in the
/// presence of another declaration with the same ID in the declaration
/// block.
pub fn push(&mut self, declaration: PropertyDeclaration, importance: Importance) {
self.push_common(declaration, importance, false);
}
fn push_common(
///
/// * For `DeclarationSource::Parsing`, this will not override a
/// declaration with more importance, and will ensure that, if inserted,
/// it's inserted at the end of the declaration block.
///
/// * For `DeclarationSource::CssOm`, this will override importance and
/// will preserve the original position on the block.
///
pub fn push(
&mut self,
declaration: PropertyDeclaration,
importance: Importance,
overwrite_more_important_and_reuse_slot: bool
source: DeclarationSource,
) -> bool {
let longhand_id = match declaration.id() {
PropertyDeclarationId::Longhand(id) => Some(id),
@ -481,7 +480,9 @@ impl PropertyDeclarationBlock {
(false, true) => {}
(true, false) => {
if !overwrite_more_important_and_reuse_slot {
// For declarations set from the OM, less-important
// declarations are overridden.
if !matches!(source, DeclarationSource::CssOm) {
return false
}
}
@ -490,17 +491,41 @@ impl PropertyDeclarationBlock {
}
}
if overwrite_more_important_and_reuse_slot {
*slot = declaration;
self.declarations_importance.set(i as u32, importance.important());
return true;
}
match source {
// CSSOM preserves the declaration position, and
// overrides importance.
DeclarationSource::CssOm => {
*slot = declaration;
self.declarations_importance.set(i as u32, importance.important());
return true;
}
DeclarationSource::Parsing => {
// As a compatibility hack, specially on Android,
// don't allow to override a prefixed webkit display
// value with an unprefixed version from parsing
// code.
//
// TODO(emilio): Unship.
if let PropertyDeclaration::Display(old_display) = *slot {
use properties::longhands::display::computed_value::T as display;
// NOTE(emilio): We could avoid this and just override for
// properties not affected by logical props, but it's not
// clear it's worth it given the `definitely_new` check.
index_to_remove = Some(i);
break;
let new_display = match declaration {
PropertyDeclaration::Display(new_display) => new_display,
_ => unreachable!("How could the declaration id be the same?"),
};
if display::should_ignore_parsed_value(old_display, new_display) {
return false;
}
}
// NOTE(emilio): We could avoid this and just override for
// properties not affected by logical props, but it's not
// clear it's worth it given the `definitely_new` check.
index_to_remove = Some(i);
break;
}
}
}
}
@ -1122,7 +1147,11 @@ where
while let Some(declaration) = iter.next() {
match declaration {
Ok(importance) => {
block.extend(iter.parser.declarations.drain(), importance);
block.extend(
iter.parser.declarations.drain(),
importance,
DeclarationSource::Parsing,
);
}
Err((error, slice)) => {
iter.parser.declarations.clear();