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Change parsing behavior and implement to_computed_value function

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Nazım Can Altınova 2016-08-27 21:49:35 +03:00
parent 4eb93c85bc
commit 8372f295b3
5 changed files with 227 additions and 106 deletions
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20
components/style/values/specified/basic_shape.rs
View file

@ -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
///
@ -265,10 +265,10 @@ impl Circle {
} else {
// Defaults to origin
Position {
horiz_keyword: None,
horiz_position: Some(LengthOrPercentage::Percentage(Percentage(0.5))),
vert_keyword: None,
vert_position: Some(LengthOrPercentage::Percentage(Percentage(0.5))),
horiz_keyword: Some(Keyword::Center),
horiz_position: None,
vert_keyword: Some(Keyword::Center),
vert_position: None,
}
};
Ok(Circle {
@ -331,10 +331,10 @@ impl Ellipse {
} else {
// Defaults to origin
Position {
horiz_keyword: None,
horiz_position: Some(LengthOrPercentage::Percentage(Percentage(0.5))),
vert_keyword: None,
vert_position: Some(LengthOrPercentage::Percentage(Percentage(0.5))),
horiz_keyword: Some(Keyword::Center),
horiz_position: None,
vert_keyword: Some(Keyword::Center),
vert_position: None,
}
};
Ok(Ellipse {

234
components/style/values/specified/position.rs
View file

@ -11,7 +11,8 @@ 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)]
@ -25,20 +26,25 @@ pub struct Position {
impl ToCss for Position {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
// TODO: canaltinova: We should add keywords, probably?
if let Some(horiz_pos) = self.horiz_position {
if let Some(horiz_key) = self.horiz_keyword {
try!(horiz_key.to_css(dest));
};
try!(horiz_pos.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;
};
try!(dest.write_str(" "));
if let Some(vert_pos) = self.vert_position {
if let Some(vert_key) = self.vert_keyword {
try!(vert_key.to_css(dest));
};
if space_at_last == false {
try!(dest.write_str(" "));
}
try!(vert_pos.to_css(dest));
};
Ok(())
@ -62,7 +68,7 @@ impl HasViewportPercentage for Position {
}
}
#[derive(Clone, PartialEq, Copy)]
#[derive(Debug, Clone, PartialEq, Copy)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
pub enum Keyword {
Center,
@ -80,40 +86,26 @@ pub enum PositionComponent {
}
impl Position {
pub fn new(first_position: Option<PositionComponent>, second_position: Option<PositionComponent>,
pub fn new(mut first_position: Option<PositionComponent>, mut second_position: Option<PositionComponent>,
first_keyword: Option<PositionComponent>, second_keyword: Option<PositionComponent>)
-> Result<Position, ()> {
// Check firts and second positions, this is more like for 2 value backgrounds.
let (mut horiz, mut vert) = if let Some(first_pos) = first_position {
if let Some(second_pos) = second_position {
match (category(first_pos), category(second_pos)) {
// 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) |
(PositionCategory::VerticalKeyword, PositionCategory::VerticalKeyword) |
(PositionCategory::LengthOrPercentage, PositionCategory::HorizontalKeyword) |
(PositionCategory::VerticalKeyword, PositionCategory::LengthOrPercentage) => return Err(()),
// Swap if both are keywords and vertical precedes horizontal.
(PositionCategory::VerticalKeyword, PositionCategory::HorizontalKeyword) |
(PositionCategory::VerticalKeyword, PositionCategory::OtherKeyword) |
(PositionCategory::OtherKeyword, PositionCategory::HorizontalKeyword) =>
(second_position, first_position),
// By default, horizontal is first.
_ => (first_position, second_position),
}
} else {
(first_position, second_position)
}
} else {
(first_position, second_position)
};
// 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 first and second keywords. This is for 4 value swapping.
// 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
@ -126,9 +118,9 @@ impl Position {
(PositionCategory::VerticalKeyword, PositionCategory::HorizontalKeyword) |
(PositionCategory::VerticalKeyword, PositionCategory::OtherKeyword) |
(PositionCategory::OtherKeyword, PositionCategory::HorizontalKeyword) => {
let tmp = horiz;
horiz = vert;
vert = tmp;
let tmp = first_position;
first_position = second_position;
second_position = tmp;
(second_keyword, first_keyword)
},
@ -136,22 +128,42 @@ impl Position {
_ => (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 (wrapped_horiz_key, wrapped_vert_key) = if let Some(PositionComponent::Keyword(horiz_key)) = horiz_keyword {
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 {
(None, None)
if let Some(PositionComponent::Keyword(vert_key)) = vert_keyword {
(None, Some(vert_key))
} else {
(None, None)
}
};
Ok(Position {
horiz_keyword: wrapped_horiz_key,
horiz_position: Some(horiz.unwrap().to_length_or_percentage()),
vert_keyword: wrapped_vert_key,
vert_position: Some(vert.unwrap().to_length_or_percentage()),
horiz_keyword: horizontal_keyword,
horiz_position: first_position,
vert_keyword: vertical_keyword,
vert_position: second_position,
})
}
@ -166,28 +178,50 @@ impl Position {
// Handle 4 value background position
Position::new(Some(second), Some(fourth), Some(first), Some(third))
} else {
// Handle 3 value background position
// Handle 3 value background position there are several options:
if let PositionCategory::LengthOrPercentage = category(first) {
// "20px bottom 20%"
// "length keyword length"
Position::new(Some(first), Some(third), None, Some(second))
} else {
if let PositionCategory::LengthOrPercentage = category(second) {
if let PositionCategory::HorizontalKeyword = category(third) {
// "bottom 10% right"
Position::new(Some(second), None, Some(first), Some(third))
} else {
// "right 10px 50%"
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 {
// "right bottom 10px"
// "keyword keyword length"
Position::new(None, Some(third), Some(first), Some(second))
}
}
}
} else {
// Handle 2 value background position
Position::new(Some(first), Some(second), None, None)
// 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)),
}
}
}
@ -195,10 +229,13 @@ impl Position {
impl ToCss for Keyword {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
match *self {
Keyword::Right => try!(dest.write_str("right ")),
Keyword::Bottom => try!(dest.write_str("bottom ")),
_ => (),
};
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(())
}
}
@ -232,9 +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.horiz_position.to_computed_value(context),
vertical: self.vert_position.to_computed_value(context),
horizontal: horizontal,
vertical: vertical,
}
}
}
@ -272,13 +364,7 @@ impl PositionComponent {
pub fn to_length_or_percentage(self) -> LengthOrPercentage {
match self {
PositionComponent::Length(value) => value,
PositionComponent::Keyword(keyword) if keyword == Keyword::Center =>
LengthOrPercentage::Percentage(Percentage(0.5)),
PositionComponent::Keyword(keyword) if keyword == Keyword::Left ||
keyword == Keyword::Top => LengthOrPercentage::Percentage(Percentage(0.0)),
PositionComponent::Keyword(keyword) if keyword == Keyword::Right ||
keyword == Keyword::Bottom => LengthOrPercentage::Percentage(Percentage(1.0)),
PositionComponent::Keyword(_) => unimplemented!(), // TODO: All keywords are covered but rust forcing me to add this too?
PositionComponent::Keyword(keyword) => keyword.to_length_or_percentage(),
}
}
}