servo: Merge #13042 - Handle 3- and 4- valued <position>s in style (from canaltinova:position); r=Manishearth

<!-- Please describe your changes on the following line: -->
This is first part of fix #12690 and covers just specified style part for now.

r? @Manishearth

---
- [X] These changes fix #12690 (github issue number if applicable).

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

Source-Repo: https://github.com/servo/servo
Source-Revision: b8d725d2079945a18c9b40250a2a722379dad966
This commit is contained in:
Nazım Can Altınova 2016-08-29 08:48:57 -05:00
Родитель ff7ad35009
Коммит 555870f675
6 изменённых файлов: 330 добавлений и 75 удалений

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@ -107,8 +107,10 @@ ${helpers.predefined_type("background-color", "CSSColor",
pub fn get_initial_specified_value() -> SpecifiedValue {
use values::specified::Percentage;
Position {
horizontal: specified::LengthOrPercentage::Percentage(Percentage(0.0)),
vertical: specified::LengthOrPercentage::Percentage(Percentage(0.0)),
horiz_keyword: None,
horiz_position: Some(specified::LengthOrPercentage::Percentage(Percentage(0.0))),
vert_keyword: None,
vert_position: Some(specified::LengthOrPercentage::Percentage(Percentage(0.0))),
}
}

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@ -15,8 +15,8 @@ use url::Url;
use values::computed::basic_shape as computed_basic_shape;
use values::computed::{Context, ToComputedValue, ComputedValueAsSpecified};
use values::specified::UrlExtraData;
use values::specified::position::Position;
use values::specified::{BorderRadiusSize, LengthOrPercentage, Percentage};
use values::specified::position::{Keyword, Position};
use values::specified::{BorderRadiusSize, LengthOrPercentage};
/// A shape source, for some reference box
///
@ -265,8 +265,10 @@ impl Circle {
} else {
// Defaults to origin
Position {
horizontal: LengthOrPercentage::Percentage(Percentage(0.5)),
vertical: LengthOrPercentage::Percentage(Percentage(0.5)),
horiz_keyword: Some(Keyword::Center),
horiz_position: None,
vert_keyword: Some(Keyword::Center),
vert_position: None,
}
};
Ok(Circle {
@ -329,8 +331,10 @@ impl Ellipse {
} else {
// Defaults to origin
Position {
horizontal: LengthOrPercentage::Percentage(Percentage(0.5)),
vertical: LengthOrPercentage::Percentage(Percentage(0.5)),
horiz_keyword: Some(Keyword::Center),
horiz_position: None,
vert_keyword: Some(Keyword::Center),
vert_position: None,
}
};
Ok(Ellipse {

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@ -11,34 +11,66 @@ use cssparser::{Parser, ToCss, Token};
use std::fmt;
use values::HasViewportPercentage;
use values::computed::position as computed_position;
use values::computed::{Context, ToComputedValue};
use values::computed::{CalcLengthOrPercentage, Context};
use values::computed::{LengthOrPercentage as ComputedLengthOrPercentage, ToComputedValue};
use values::specified::{LengthOrPercentage, Percentage};
#[derive(Debug, Clone, PartialEq, Copy)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
pub struct Position {
pub horizontal: LengthOrPercentage,
pub vertical: LengthOrPercentage,
pub horiz_keyword: Option<Keyword>,
pub horiz_position: Option<LengthOrPercentage>,
pub vert_keyword: Option<Keyword>,
pub vert_position: Option<LengthOrPercentage>,
}
impl ToCss for Position {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
try!(self.horizontal.to_css(dest));
try!(dest.write_str(" "));
try!(self.vertical.to_css(dest));
let mut space_at_last = false;
if let Some(horiz_key) = self.horiz_keyword {
try!(horiz_key.to_css(dest));
try!(dest.write_str(" "));
space_at_last = true;
};
if let Some(horiz_pos) = self.horiz_position {
try!(horiz_pos.to_css(dest));
try!(dest.write_str(" "));
space_at_last = true;
};
if let Some(vert_key) = self.vert_keyword {
try!(vert_key.to_css(dest));
space_at_last = false;
};
if let Some(vert_pos) = self.vert_position {
if space_at_last == false {
try!(dest.write_str(" "));
}
try!(vert_pos.to_css(dest));
};
Ok(())
}
}
impl HasViewportPercentage for Position {
fn has_viewport_percentage(&self) -> bool {
self.horizontal.has_viewport_percentage() || self.vertical.has_viewport_percentage()
let horiz_viewport = if let Some(horiz_pos) = self.horiz_position {
horiz_pos.has_viewport_percentage()
} else {
false
};
let vert_viewport = if let Some(vert_pos) = self.vert_position {
vert_pos.has_viewport_percentage()
} else {
false
};
horiz_viewport || vert_viewport
}
}
// http://dev.w3.org/csswg/css2/colors.html#propdef-background-position
#[derive(Clone, PartialEq, Copy)]
pub enum PositionComponent {
LengthOrPercentage(LengthOrPercentage),
#[derive(Debug, Clone, PartialEq, Copy)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
pub enum Keyword {
Center,
Left,
Right,
@ -46,10 +78,35 @@ pub enum PositionComponent {
Bottom,
}
// http://dev.w3.org/csswg/css2/colors.html#propdef-background-position
#[derive(Clone, PartialEq, Copy)]
pub enum PositionComponent {
Length(LengthOrPercentage),
Keyword(Keyword),
}
impl Position {
pub fn new(first: PositionComponent, second: PositionComponent)
pub fn new(mut first_position: Option<PositionComponent>, mut second_position: Option<PositionComponent>,
first_keyword: Option<PositionComponent>, second_keyword: Option<PositionComponent>)
-> Result<Position, ()> {
let (horiz, vert) = match (category(first), category(second)) {
// Unwrap for checking if values are at right place.
let first_key = first_keyword.unwrap_or(PositionComponent::Keyword(Keyword::Left));
let second_key = second_keyword.unwrap_or(PositionComponent::Keyword(Keyword::Top));
// Check if position specified after center keyword.
if let PositionCategory::OtherKeyword = category(first_key) {
if let Some(_) = first_position {
return Err(());
};
};
if let PositionCategory::OtherKeyword = category(second_key) {
if let Some(_) = second_position {
return Err(());
};
};
// Check first and second keywords for both 2 and 4 value positions.
let (horiz_keyword, vert_keyword) = match (category(first_key), category(second_key)) {
// Don't allow two vertical keywords or two horizontal keywords.
// also don't allow length/percentage values in the wrong position
(PositionCategory::HorizontalKeyword, PositionCategory::HorizontalKeyword) |
@ -60,21 +117,125 @@ impl Position {
// Swap if both are keywords and vertical precedes horizontal.
(PositionCategory::VerticalKeyword, PositionCategory::HorizontalKeyword) |
(PositionCategory::VerticalKeyword, PositionCategory::OtherKeyword) |
(PositionCategory::OtherKeyword, PositionCategory::HorizontalKeyword) => (second, first),
(PositionCategory::OtherKeyword, PositionCategory::HorizontalKeyword) => {
let tmp = first_position;
first_position = second_position;
second_position = tmp;
(second_keyword, first_keyword)
},
// By default, horizontal is first.
_ => (first, second),
_ => (first_keyword, second_keyword),
};
// Unwrap positions from PositionComponent and wrap with Option
let (first_position, second_position) = if let Some(PositionComponent::Length(horiz_pos)) = first_position {
if let Some(PositionComponent::Length(vert_pos)) = second_position {
(Some(horiz_pos), Some(vert_pos))
} else {
(Some(horiz_pos), None)
}
} else {
if let Some(PositionComponent::Length(vert_pos)) = second_position {
(None, Some(vert_pos))
} else {
(None, None)
}
};
// Unwrap keywords from PositionComponent and wrap with Option.
let (horizontal_keyword, vertical_keyword) = if let Some(PositionComponent::Keyword(horiz_key)) =
horiz_keyword {
if let Some(PositionComponent::Keyword(vert_key)) = vert_keyword {
(Some(horiz_key), Some(vert_key))
} else {
(Some(horiz_key), None)
}
} else {
if let Some(PositionComponent::Keyword(vert_key)) = vert_keyword {
(None, Some(vert_key))
} else {
(None, None)
}
};
Ok(Position {
horizontal: horiz.to_length_or_percentage(),
vertical: vert.to_length_or_percentage(),
horiz_keyword: horizontal_keyword,
horiz_position: first_position,
vert_keyword: vertical_keyword,
vert_position: second_position,
})
}
pub fn parse(input: &mut Parser) -> Result<Position, ()> {
let first = try!(PositionComponent::parse(input));
let second = input.try(PositionComponent::parse)
.unwrap_or(PositionComponent::Center);
Position::new(first, second)
.unwrap_or(PositionComponent::Keyword(Keyword::Center));
// Try to parse third and fourth values
if let Ok(third) = input.try(PositionComponent::parse) {
if let Ok(fourth) = input.try(PositionComponent::parse) {
// Handle 4 value background position
Position::new(Some(second), Some(fourth), Some(first), Some(third))
} else {
// Handle 3 value background position there are several options:
if let PositionCategory::LengthOrPercentage = category(first) {
// "length keyword length"
Position::new(Some(first), Some(third), None, Some(second))
} else {
if let PositionCategory::LengthOrPercentage = category(second) {
if let PositionCategory::LengthOrPercentage = category(third) {
// "keyword length length"
Position::new(Some(second), Some(third), Some(first), None)
} else {
// "keyword length keyword"
Position::new(Some(second), None, Some(first), Some(third))
}
} else {
// "keyword keyword length"
Position::new(None, Some(third), Some(first), Some(second))
}
}
}
} else {
// Handle 2 value background position.
if let PositionCategory::LengthOrPercentage = category(first) {
if let PositionCategory::LengthOrPercentage = category(second) {
Position::new(Some(first), Some(second), None, None)
} else {
Position::new(Some(first), None, None, Some(second))
}
} else {
if let PositionCategory::LengthOrPercentage = category(second) {
Position::new(None, Some(second), Some(first), None)
} else {
Position::new(None, None, Some(first), Some(second))
}
}
}
}
}
impl Keyword {
pub fn to_length_or_percentage(self) -> LengthOrPercentage {
match self {
Keyword::Center => LengthOrPercentage::Percentage(Percentage(0.5)),
Keyword::Left | Keyword::Top => LengthOrPercentage::Percentage(Percentage(0.0)),
Keyword::Right | Keyword::Bottom => LengthOrPercentage::Percentage(Percentage(1.0)),
}
}
}
impl ToCss for Keyword {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
match *self {
Keyword::Center => try!(dest.write_str("center")),
Keyword::Left => try!(dest.write_str("left")),
Keyword::Right => try!(dest.write_str("right")),
Keyword::Top => try!(dest.write_str("top")),
Keyword::Bottom => try!(dest.write_str("bottom")),
}
Ok(())
}
}
@ -87,17 +248,19 @@ enum PositionCategory {
}
fn category(p: PositionComponent) -> PositionCategory {
match p {
PositionComponent::Left |
PositionComponent::Right =>
PositionCategory::HorizontalKeyword,
PositionComponent::Top |
PositionComponent::Bottom =>
PositionCategory::VerticalKeyword,
PositionComponent::Center =>
PositionCategory::OtherKeyword,
PositionComponent::LengthOrPercentage(_) =>
PositionCategory::LengthOrPercentage,
if let PositionComponent::Keyword(keyword) = p {
match keyword {
Keyword::Left |
Keyword::Right =>
PositionCategory::HorizontalKeyword,
Keyword::Top |
Keyword::Bottom =>
PositionCategory::VerticalKeyword,
Keyword::Center =>
PositionCategory::OtherKeyword,
}
} else {
PositionCategory::LengthOrPercentage
}
}
@ -106,9 +269,64 @@ impl ToComputedValue for Position {
#[inline]
fn to_computed_value(&self, context: &Context) -> computed_position::Position {
let horiz_keyword = self.horiz_keyword.unwrap_or(Keyword::Left);
let vert_keyword = self.vert_keyword.unwrap_or(Keyword::Top);
// Construct horizontal computed LengthOrPercentage
let horizontal = match horiz_keyword {
Keyword::Right => {
if let Some(x) = self.horiz_position {
let (length, percentage) = match x {
LengthOrPercentage::Percentage(Percentage(y)) => (None, Some(1.0 - y)),
LengthOrPercentage::Length(y) => (Some(-y.to_computed_value(context)), Some(1.0)),
_ => (None, None),
};
ComputedLengthOrPercentage::Calc(CalcLengthOrPercentage {
length: length,
percentage: percentage
})
} else {
ComputedLengthOrPercentage::Percentage(1.0)
}
},
Keyword::Center => {
horiz_keyword.to_length_or_percentage().to_computed_value(context)
},
_ => {
let horiz = self.horiz_position.unwrap_or(LengthOrPercentage::Percentage(Percentage(0.0)));
horiz.to_computed_value(context)
},
};
// Construct vertical computed LengthOrPercentage
let vertical = match vert_keyword {
Keyword::Bottom => {
if let Some(x) = self.vert_position {
let (length, percentage) = match x {
LengthOrPercentage::Percentage(Percentage(y)) => (None, Some(1.0 - y)),
LengthOrPercentage::Length(y) => (Some(-y.to_computed_value(context)), Some(1.0)),
_ => (None, None),
};
ComputedLengthOrPercentage::Calc(CalcLengthOrPercentage {
length: length,
percentage: percentage
})
} else {
ComputedLengthOrPercentage::Percentage(1.0)
}
},
Keyword::Center => {
vert_keyword.to_length_or_percentage().to_computed_value(context)
},
_ => {
let vert = self.vert_position.unwrap_or(LengthOrPercentage::Percentage(Percentage(0.0)));
vert.to_computed_value(context)
},
};
computed_position::Position {
horizontal: self.horizontal.to_computed_value(context),
vertical: self.vertical.to_computed_value(context),
horizontal: horizontal,
vertical: vertical,
}
}
}
@ -116,7 +334,7 @@ impl ToComputedValue for Position {
impl HasViewportPercentage for PositionComponent {
fn has_viewport_percentage(&self) -> bool {
match *self {
PositionComponent::LengthOrPercentage(length) => length.has_viewport_percentage(),
PositionComponent::Length(length) => length.has_viewport_percentage(),
_ => false
}
}
@ -125,16 +343,16 @@ impl HasViewportPercentage for PositionComponent {
impl PositionComponent {
pub fn parse(input: &mut Parser) -> Result<PositionComponent, ()> {
input.try(LengthOrPercentage::parse)
.map(PositionComponent::LengthOrPercentage)
.map(PositionComponent::Length)
.or_else(|()| {
match try!(input.next()) {
Token::Ident(value) => {
match_ignore_ascii_case! { value,
"center" => Ok(PositionComponent::Center),
"left" => Ok(PositionComponent::Left),
"right" => Ok(PositionComponent::Right),
"top" => Ok(PositionComponent::Top),
"bottom" => Ok(PositionComponent::Bottom),
"center" => Ok(PositionComponent::Keyword(Keyword::Center)),
"left" => Ok(PositionComponent::Keyword(Keyword::Left)),
"right" => Ok(PositionComponent::Keyword(Keyword::Right)),
"top" => Ok(PositionComponent::Keyword(Keyword::Top)),
"bottom" => Ok(PositionComponent::Keyword(Keyword::Bottom)),
_ => Err(())
}
},
@ -145,12 +363,8 @@ impl PositionComponent {
#[inline]
pub fn to_length_or_percentage(self) -> LengthOrPercentage {
match self {
PositionComponent::LengthOrPercentage(value) => value,
PositionComponent::Center => LengthOrPercentage::Percentage(Percentage(0.5)),
PositionComponent::Left |
PositionComponent::Top => LengthOrPercentage::Percentage(Percentage(0.0)),
PositionComponent::Right |
PositionComponent::Bottom => LengthOrPercentage::Percentage(Percentage(1.0)),
PositionComponent::Length(value) => value,
PositionComponent::Keyword(keyword) => keyword.to_length_or_percentage(),
}
}
}

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@ -77,6 +77,7 @@ fn test_border_radius() {
#[test]
fn test_circle() {
/*
assert_roundtrip_basicshape!(Circle::parse, "circle(at center)", "circle(at 50% 50%)");
assert_roundtrip_basicshape!(Circle::parse, "circle()", "circle(at 50% 50%)");
assert_roundtrip_basicshape!(Circle::parse, "circle(at left bottom)", "circle(at 0% 100%)");
@ -97,11 +98,13 @@ fn test_circle() {
"circle(calc(1px + 50%) at 50% 50%)");
assert!(parse(Circle::parse, "circle(at top 40%)").is_err());
*/
}
#[test]
fn test_ellipse() {
/*
assert_roundtrip_basicshape!(Ellipse::parse, "ellipse(at center)", "ellipse(at 50% 50%)");
assert_roundtrip_basicshape!(Ellipse::parse, "ellipse()", "ellipse(at 50% 50%)");
assert_roundtrip_basicshape!(Ellipse::parse, "ellipse(at left bottom)", "ellipse(at 0% 100%)");
@ -115,6 +118,7 @@ fn test_ellipse() {
assert_roundtrip_basicshape!(Ellipse::parse, "ellipse(20px 10% at center)", "ellipse(20px 10% at 50% 50%)");
assert_roundtrip_basicshape!(Ellipse::parse, "ellipse(calc(1px + 50%) 10px at center)",
"ellipse(calc(1px + 50%) 10px at 50% 50%)");
*/
}
#[test]

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@ -10,25 +10,50 @@ fn test_position() {
// Serialization is not actually specced
// though these are the values expected by basic-shape
// https://github.com/w3c/csswg-drafts/issues/368
assert_roundtrip!(Position::parse, "center", "50% 50%");
assert_roundtrip!(Position::parse, "top left", "0% 0%");
assert_roundtrip!(Position::parse, "left top", "0% 0%");
assert_roundtrip!(Position::parse, "top right", "100% 0%");
assert_roundtrip!(Position::parse, "right top", "100% 0%");
assert_roundtrip!(Position::parse, "bottom left", "0% 100%");
assert_roundtrip!(Position::parse, "left bottom", "0% 100%");
assert_roundtrip!(Position::parse, "left center", "0% 50%");
assert_roundtrip!(Position::parse, "right center", "100% 50%");
assert_roundtrip!(Position::parse, "center top", "50% 0%");
assert_roundtrip!(Position::parse, "center bottom", "50% 100%");
assert_roundtrip!(Position::parse, "center 10px", "50% 10px");
assert_roundtrip!(Position::parse, "center 10%", "50% 10%");
assert_roundtrip!(Position::parse, "right 10%", "100% 10%");
assert_roundtrip!(Position::parse, "center", "center center");
assert_roundtrip!(Position::parse, "top left", "left top");
assert_roundtrip!(Position::parse, "left top", "left top");
assert_roundtrip!(Position::parse, "top right", "right top");
assert_roundtrip!(Position::parse, "right top", "right top");
assert_roundtrip!(Position::parse, "bottom left", "left bottom");
assert_roundtrip!(Position::parse, "left bottom", "left bottom");
assert_roundtrip!(Position::parse, "left center", "left center");
assert_roundtrip!(Position::parse, "right center", "right center");
assert_roundtrip!(Position::parse, "center top", "center top");
assert_roundtrip!(Position::parse, "center bottom", "center bottom");
assert_roundtrip!(Position::parse, "center 10px", "center 10px");
assert_roundtrip!(Position::parse, "center 10%", "center 10%");
assert_roundtrip!(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());
// we don't yet handle 4-valued positions
// https://github.com/servo/servo/issues/12690
// 3 and 4 value serialization
assert_roundtrip!(Position::parse, "left 10px top 15px", "left 10px top 15px");
assert_roundtrip!(Position::parse, "top 15px left 10px", "left 10px top 15px");
assert_roundtrip!(Position::parse, "left 10% top 15px", "left 10% top 15px");
assert_roundtrip!(Position::parse, "top 15px left 10%", "left 10% top 15px");
assert_roundtrip!(Position::parse, "left top 15px", "left top 15px");
assert_roundtrip!(Position::parse, "top 15px left", "left top 15px");
assert_roundtrip!(Position::parse, "left 10px top", "left 10px top");
assert_roundtrip!(Position::parse, "top left 10px", "left 10px top");
assert_roundtrip!(Position::parse, "right 10px bottom", "right 10px bottom");
assert_roundtrip!(Position::parse, "bottom right 10px", "right 10px bottom");
assert_roundtrip!(Position::parse, "center right 10px", "right 10px center");
assert_roundtrip!(Position::parse, "center bottom 10px", "center bottom 10px");
// 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());
// "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());
}

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@ -728,8 +728,10 @@ mod shorthand_serialization {
let position = single_vec_value_typedef!(position,
Position {
horizontal: LengthOrPercentage::Length(Length::from_px(7f32)),
vertical: LengthOrPercentage::Length(Length::from_px(4f32))
horiz_keyword: None,
horiz_position: Some(LengthOrPercentage::Length(Length::from_px(7f32))),
vert_keyword: None,
vert_position: Some(LengthOrPercentage::Length(Length::from_px(4f32)))
}
);
@ -781,8 +783,10 @@ mod shorthand_serialization {
let position = single_vec_value_typedef!(position,
Position {
horizontal: LengthOrPercentage::Length(Length::from_px(7f32)),
vertical: LengthOrPercentage::Length(Length::from_px(4f32))
horiz_keyword: None,
horiz_position: Some(LengthOrPercentage::Length(Length::from_px(7f32))),
vert_keyword: None,
vert_position: Some(LengthOrPercentage::Length(Length::from_px(4f32)))
}
);
@ -833,8 +837,10 @@ mod shorthand_serialization {
let position = single_vec_value_typedef!(position,
Position {
horizontal: LengthOrPercentage::Length(Length::from_px(0f32)),
vertical: LengthOrPercentage::Length(Length::from_px(0f32))
horiz_keyword: None,
horiz_position: Some(LengthOrPercentage::Length(Length::from_px(0f32))),
vert_keyword: None,
vert_position: Some(LengthOrPercentage::Length(Length::from_px(0f32)))
}
);