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Refactor Position

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A specified position is now a struct made of two values of different types,
the first one being PositionComponent<X>, and the second one PositionComponent<Y>.

A position component is represented by the new enum PositionComponent<Side>,
with the three values Center, Length(LengthOrPercentage), and
Side(Side, Option<LengthOrPercentage>).

Side keywords are represented by the X and Y enums, which don't include a value
for the center keyword anymore. They are accompanied by the Side trait, which
allows us to determine whether a side keyword is "left" or "top".

This refactor simplified the parsing and serialisation code and exposed bugs in it,
where it would reject valid <position> values followed by arbitrary tokens,
and where it would fail to prefer "left" to "right" when serialising positions
in basic shapes.
This commit is contained in:
Anthony Ramine 2017-05-08 03:09:26 +02:00
parent 0040160b38
commit 70ec61cf01
22 changed files with 484 additions and 887 deletions
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6
components/style/properties/longhand/box.mako.rs
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@ -2143,11 +2143,11 @@ ${helpers.predefined_type("perspective",
animation_value_type="ComputedValue")}
${helpers.predefined_type("perspective-origin",
"position::OriginPosition",
"computed::position::OriginPosition::center()",
"position::Position",
"computed::position::Position::center()",
boxed="True",
extra_prefixes="moz webkit",
spec="https://drafts.csswg.org/css-transforms/#perspective-origin-property",
spec="https://drafts.csswg.org/css-transforms-2/#perspective-origin-property",
animation_value_type="ComputedValue")}
${helpers.single_keyword("backface-visibility",