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Extract the shape parsing code from GradientKind::parse_radial

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This commit is contained in:
Anthony Ramine 2017-04-18 10:31:14 +02:00
parent 5062c4b117
commit 50c25f3221
1 changed files with 42 additions and 39 deletions
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81
components/style/values/specified/image.rs
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@ -235,49 +235,17 @@ impl GradientKind {
pub fn parse_radial(context: &ParserContext, input: &mut Parser) -> Result<GradientKind, ()> {
let mut needs_comma = true;
// Ending shape and position can be in various order. Checks all probabilities.
let (shape, position) = if let Ok(position) = input.try(|i| parse_position(context, i)) {
// Handle just <position>
// Handle just "at" <position>
(EndingShape::Ellipse(LengthOrPercentageOrKeyword::Keyword(SizeKeyword::FarthestCorner)), position)
} else if let Ok((first, second)) = input.try(|i| parse_two_length(context, i)) {
// Handle <LengthOrPercentage> <LengthOrPercentage> <shape>? <position>?
let _ = input.try(|input| input.expect_ident_matching("ellipse"));
(EndingShape::Ellipse(LengthOrPercentageOrKeyword::LengthOrPercentage(first, second)),
input.try(|i| parse_position(context, i)).unwrap_or(Position::center()))
} else if let Ok(length) = input.try(|i| Length::parse(context, i)) {
// Handle <Length> <circle>? <position>?
let _ = input.try(|input| input.expect_ident_matching("circle"));
(EndingShape::Circle(LengthOrKeyword::Length(length)),
input.try(|i| parse_position(context, i)).unwrap_or(Position::center()))
} else if let Ok(keyword) = input.try(SizeKeyword::parse) {
// Handle <keyword> <shape-keyword>? <position>?
let shape = if input.try(|input| input.expect_ident_matching("circle")).is_ok() {
EndingShape::Circle(LengthOrKeyword::Keyword(keyword))
} else {
let _ = input.try(|input| input.expect_ident_matching("ellipse"));
EndingShape::Ellipse(LengthOrPercentageOrKeyword::Keyword(keyword))
};
} else if let Ok(shape) = input.try(|i| parse_shape(context, i)) {
// Handle <shape> ["at" <position>]?
(shape, input.try(|i| parse_position(context, i)).unwrap_or(Position::center()))
} else {
// Handle <shape-keyword> <length>? <position>?
if input.try(|input| input.expect_ident_matching("ellipse")).is_ok() {
// Handle <ellipse> <LengthOrPercentageOrKeyword>? <position>?
let length = input.try(|i| LengthOrPercentageOrKeyword::parse(context, i))
.unwrap_or(LengthOrPercentageOrKeyword::Keyword(SizeKeyword::FarthestCorner));
(EndingShape::Ellipse(length),
input.try(|i| parse_position(context, i)).unwrap_or(Position::center()))
} else if input.try(|input| input.expect_ident_matching("circle")).is_ok() {
// Handle <ellipse> <LengthOrKeyword>? <position>?
let length = input.try(|i| LengthOrKeyword::parse(context, i))
.unwrap_or(LengthOrKeyword::Keyword(SizeKeyword::FarthestCorner));
(EndingShape::Circle(length), input.try(|i| parse_position(context, i))
.unwrap_or(Position::center()))
} else {
// If there is no shape keyword, it should set to default.
needs_comma = false;
(EndingShape::Ellipse(LengthOrPercentageOrKeyword::Keyword(SizeKeyword::FarthestCorner)),
input.try(|i| parse_position(context, i)).unwrap_or(Position::center()))
}
// If there is no shape keyword, it should set to default.
needs_comma = false;
(EndingShape::Ellipse(LengthOrPercentageOrKeyword::Keyword(SizeKeyword::FarthestCorner)),
Position::center())
};
if needs_comma {
@ -358,6 +326,41 @@ fn parse_position(context: &ParserContext, input: &mut Parser) -> Result<Positio
input.try(|i| Position::parse(context, i))
}
fn parse_shape(context: &ParserContext, input: &mut Parser) -> Result<EndingShape, ()> {
if let Ok((first, second)) = input.try(|i| parse_two_length(context, i)) {
// Handle <LengthOrPercentage> <LengthOrPercentage> <shape>?
let _ = input.try(|input| input.expect_ident_matching("ellipse"));
Ok(EndingShape::Ellipse(LengthOrPercentageOrKeyword::LengthOrPercentage(first, second)))
} else if let Ok(length) = input.try(|i| Length::parse(context, i)) {
// Handle <Length> <circle>?
let _ = input.try(|input| input.expect_ident_matching("circle"));
Ok(EndingShape::Circle(LengthOrKeyword::Length(length)))
} else if let Ok(keyword) = input.try(SizeKeyword::parse) {
// Handle <keyword> <shape-keyword>?
if input.try(|input| input.expect_ident_matching("circle")).is_ok() {
Ok(EndingShape::Circle(LengthOrKeyword::Keyword(keyword)))
} else {
let _ = input.try(|input| input.expect_ident_matching("ellipse"));
Ok(EndingShape::Ellipse(LengthOrPercentageOrKeyword::Keyword(keyword)))
}
} else {
// https://github.com/rust-lang/rust/issues/41272
if input.try(|input| input.expect_ident_matching("ellipse")).is_ok() {
// Handle <ellipse> <LengthOrPercentageOrKeyword>?
let length = input.try(|i| LengthOrPercentageOrKeyword::parse(context, i))
.unwrap_or(LengthOrPercentageOrKeyword::Keyword(SizeKeyword::FarthestCorner));
Ok(EndingShape::Ellipse(length))
} else if input.try(|input| input.expect_ident_matching("circle")).is_ok() {
// Handle <circle> <LengthOrKeyword>?
let length = input.try(|i| LengthOrKeyword::parse(context, i))
.unwrap_or(LengthOrKeyword::Keyword(SizeKeyword::FarthestCorner));
Ok(EndingShape::Circle(length))
} else {
Err(())
}
}
}
/// Specified values for an angle or a corner in a linear gradient.
#[derive(Clone, PartialEq, Copy, Debug)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]