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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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2
tests/unit/style/parsing/basic_shape.rs
View file

@ -124,7 +124,7 @@ fn test_circle() {
assert_roundtrip_basicshape!(Circle::parse, "circle(at right 5% bottom 0px)",
"circle(at 95% 100%)");
assert_roundtrip_basicshape!(Circle::parse, "circle(at right 5% bottom 1px)",
"circle(at right 5% bottom 1px)");
"circle(at left 95% bottom 1px)");
assert!(parse(Circle::parse, "circle(at 5% bottom 1px)").is_err());
assert!(parse(Circle::parse, "circle(at top 40%)").is_err());

4
tests/unit/style/parsing/mod.rs
View file

@ -20,6 +20,10 @@ fn parse<T, F: Fn(&ParserContext, &mut Parser) -> Result<T, ()>>(f: F, s: &str)
f(&context, &mut parser)
}
fn parse_entirely<T, F: Fn(&ParserContext, &mut Parser) -> Result<T, ()>>(f: F, s: &str) -> Result<T, ()> {
parse(|context, parser| parser.parse_entirely(|p| f(context, p)), s)
}
// This is a macro so that the file/line information
// is preserved in the panic
macro_rules! assert_roundtrip_with_context {

80
tests/unit/style/parsing/position.rs
View file

@ -2,7 +2,7 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use parsing::parse;
use parsing::{parse, parse_entirely};
use style::parser::Parse;
use style::values::specified::position::*;
use style_traits::ToCss;
@ -28,8 +28,8 @@ fn test_position() {
assert_roundtrip_with_context!(Position::parse, "right 10%", "right 10%");
// Only keywords can be reordered
assert!(parse(Position::parse, "top 40%").is_err());
assert!(parse(Position::parse, "40% left").is_err());
assert!(parse_entirely(Position::parse, "top 40%").is_err());
assert!(parse_entirely(Position::parse, "40% left").is_err());
// 3 and 4 value serialization
assert_roundtrip_with_context!(Position::parse, "left 10px top 15px", "left 10px top 15px");
@ -46,31 +46,31 @@ fn test_position() {
assert_roundtrip_with_context!(Position::parse, "center bottom 10px", "center bottom 10px");
// Invalid 3 value positions
assert!(parse(Position::parse, "20px 30px 20px").is_err());
assert!(parse(Position::parse, "top 30px 20px").is_err());
assert!(parse(Position::parse, "50% bottom 20%").is_err());
assert!(parse_entirely(Position::parse, "20px 30px 20px").is_err());
assert!(parse_entirely(Position::parse, "top 30px 20px").is_err());
assert!(parse_entirely(Position::parse, "50% bottom 20%").is_err());
// Only horizontal and vertical keywords can have positions
assert!(parse(Position::parse, "center 10px left 15px").is_err());
assert!(parse(Position::parse, "center 10px 15px").is_err());
assert!(parse(Position::parse, "center 10px bottom").is_err());
assert!(parse_entirely(Position::parse, "center 10px left 15px").is_err());
assert!(parse_entirely(Position::parse, "center 10px 15px").is_err());
assert!(parse_entirely(Position::parse, "center 10px bottom").is_err());
// "Horizontal Horizontal" or "Vertical Vertical" positions cause error
assert!(parse(Position::parse, "left right").is_err());
assert!(parse(Position::parse, "left 10px right").is_err());
assert!(parse(Position::parse, "left 10px right 15%").is_err());
assert!(parse(Position::parse, "top bottom").is_err());
assert!(parse(Position::parse, "top 10px bottom").is_err());
assert!(parse(Position::parse, "top 10px bottom 15%").is_err());
assert!(parse_entirely(Position::parse, "left right").is_err());
assert!(parse_entirely(Position::parse, "left 10px right").is_err());
assert!(parse_entirely(Position::parse, "left 10px right 15%").is_err());
assert!(parse_entirely(Position::parse, "top bottom").is_err());
assert!(parse_entirely(Position::parse, "top 10px bottom").is_err());
assert!(parse_entirely(Position::parse, "top 10px bottom 15%").is_err());
// Logical keywords are not supported in Position yet
// Logical keywords are not supported in Position yet.
assert!(parse(Position::parse, "x-start").is_err());
assert!(parse(Position::parse, "y-end").is_err());
assert!(parse(Position::parse, "x-start y-end").is_err());
assert!(parse(Position::parse, "x-end 10px").is_err());
assert!(parse(Position::parse, "y-start 20px").is_err());
assert!(parse(Position::parse, "x-start bottom 10%").is_err());
assert!(parse(Position::parse, "left y-start 10%").is_err());
assert!(parse_entirely(Position::parse, "left y-start 10%").is_err());
assert!(parse(Position::parse, "x-start 20px y-end 10%").is_err());
}
@ -82,29 +82,31 @@ fn test_horizontal_position() {
assert_roundtrip_with_context!(HorizontalPosition::parse, "center", "center");
assert_roundtrip_with_context!(HorizontalPosition::parse, "left", "left");
assert_roundtrip_with_context!(HorizontalPosition::parse, "right", "right");
assert_roundtrip_with_context!(HorizontalPosition::parse, "x-start", "x-start");
assert_roundtrip_with_context!(HorizontalPosition::parse, "x-end", "x-end");
// Two value serializations.
assert_roundtrip_with_context!(HorizontalPosition::parse, "right 10px", "right 10px");
assert_roundtrip_with_context!(HorizontalPosition::parse, "10px left", "left 10px");
assert_roundtrip_with_context!(HorizontalPosition::parse, "x-end 20%", "x-end 20%");
assert_roundtrip_with_context!(HorizontalPosition::parse, "20px x-start", "x-start 20px");
// Invalid horizontal positions.
assert!(parse(HorizontalPosition::parse, "top").is_err());
assert!(parse(HorizontalPosition::parse, "bottom").is_err());
assert!(parse(HorizontalPosition::parse, "y-start").is_err());
assert!(parse(HorizontalPosition::parse, "y-end").is_err());
assert!(parse(HorizontalPosition::parse, "20px y-end").is_err());
assert!(parse(HorizontalPosition::parse, "y-end 20px ").is_err());
assert!(parse(HorizontalPosition::parse, "bottom 20px").is_err());
assert!(parse(HorizontalPosition::parse, "20px top").is_err());
assert!(parse(HorizontalPosition::parse, "left center").is_err());
assert!(parse(HorizontalPosition::parse, "bottom top").is_err());
assert!(parse(HorizontalPosition::parse, "left top").is_err());
assert!(parse(HorizontalPosition::parse, "left right").is_err());
assert!(parse(HorizontalPosition::parse, "20px 30px").is_err());
assert!(parse_entirely(HorizontalPosition::parse, "20px y-end").is_err());
assert!(parse_entirely(HorizontalPosition::parse, "20px top").is_err());
assert!(parse_entirely(HorizontalPosition::parse, "left center").is_err());
assert!(parse_entirely(HorizontalPosition::parse, "left top").is_err());
assert!(parse_entirely(HorizontalPosition::parse, "left right").is_err());
assert!(parse_entirely(HorizontalPosition::parse, "20px 30px").is_err());
assert!(parse_entirely(HorizontalPosition::parse, "10px left").is_err());
assert!(parse_entirely(HorizontalPosition::parse, "x-end 20%").is_err());
assert!(parse_entirely(HorizontalPosition::parse, "20px x-start").is_err());
// Logical keywords are not supported in Position yet.
assert!(parse(HorizontalPosition::parse, "x-start").is_err());
assert!(parse(HorizontalPosition::parse, "x-end").is_err());
}
#[test]
@ -115,29 +117,31 @@ fn test_vertical_position() {
assert_roundtrip_with_context!(VerticalPosition::parse, "center", "center");
assert_roundtrip_with_context!(VerticalPosition::parse, "top", "top");
assert_roundtrip_with_context!(VerticalPosition::parse, "bottom", "bottom");
assert_roundtrip_with_context!(VerticalPosition::parse, "y-start", "y-start");
assert_roundtrip_with_context!(VerticalPosition::parse, "y-end", "y-end");
// Two value serializations.
assert_roundtrip_with_context!(VerticalPosition::parse, "bottom 10px", "bottom 10px");
assert_roundtrip_with_context!(VerticalPosition::parse, "10px top", "top 10px");
assert_roundtrip_with_context!(VerticalPosition::parse, "y-end 20%", "y-end 20%");
assert_roundtrip_with_context!(VerticalPosition::parse, "20px y-start", "y-start 20px");
// Invalid vertical positions.
assert!(parse(VerticalPosition::parse, "left").is_err());
assert!(parse(VerticalPosition::parse, "right").is_err());
assert!(parse(VerticalPosition::parse, "x-start").is_err());
assert!(parse(VerticalPosition::parse, "x-end").is_err());
assert!(parse(VerticalPosition::parse, "20px x-end").is_err());
assert!(parse(VerticalPosition::parse, "x-end 20px ").is_err());
assert!(parse(VerticalPosition::parse, "x-end 20px").is_err());
assert!(parse(VerticalPosition::parse, "left 20px").is_err());
assert!(parse(VerticalPosition::parse, "20px right").is_err());
assert!(parse(VerticalPosition::parse, "left center").is_err());
assert!(parse(VerticalPosition::parse, "bottom top").is_err());
assert!(parse(VerticalPosition::parse, "left top").is_err());
assert!(parse(VerticalPosition::parse, "left right").is_err());
assert!(parse(VerticalPosition::parse, "20px 30px").is_err());
assert!(parse_entirely(VerticalPosition::parse, "20px x-end").is_err());
assert!(parse_entirely(VerticalPosition::parse, "20px right").is_err());
assert!(parse_entirely(VerticalPosition::parse, "bottom top").is_err());
assert!(parse_entirely(VerticalPosition::parse, "20px 30px").is_err());
assert!(parse_entirely(VerticalPosition::parse, "10px top").is_err());
assert!(parse_entirely(VerticalPosition::parse, "y-end 20%").is_err());
assert!(parse_entirely(VerticalPosition::parse, "20px y-start").is_err());
// Logical keywords are not supported in Position yet.
assert!(parse(VerticalPosition::parse, "y-start").is_err());
assert!(parse(VerticalPosition::parse, "y-end").is_err());
}
#[test]

1
tests/unit/style/parsing/value.rs
View file

@ -3,7 +3,6 @@
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use app_units::Au;
use parsing::parse;
use style::values::HasViewportPercentage;
use style::values::specified::{AbsoluteLength, NoCalcLength, ViewportPercentageLength};