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Add add_impls_for_keyword_enum macro for implementing necessary traits

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This commit is contained in:
Ravi Shankar 2017-04-13 10:59:55 +05:30
parent 6bd3469e28
commit 76df67fc7b
2 changed files with 23 additions and 1 deletions
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21
components/style/values/mod.rs
View file

@ -60,6 +60,27 @@ macro_rules! no_viewport_percentage {
};
}
/// A macro for implementing `ComputedValueAsSpecified`, `Parse`
/// and `HasViewportPercentage` traits for the enums defined
/// using `define_css_keyword_enum` macro.
///
/// NOTE: We should either move `Parse` trait to `style_traits`
/// or `define_css_keyword_enum` macro to this crate, but that
/// may involve significant cleanup in both the crates.
macro_rules! add_impls_for_keyword_enum {
($name:ident) => {
impl Parse for $name {
#[inline]
fn parse(_context: &ParserContext, input: &mut ::cssparser::Parser) -> Result<Self, ()> {
$name::parse(input)
}
}
impl ComputedValueAsSpecified for $name {}
no_viewport_percentage!($name);
};
}
pub mod computed;
pub mod specified;

3
components/style/values/specified/basic_shape.rs
View file

@ -14,6 +14,7 @@ use properties::shorthands::{parse_four_sides, serialize_four_sides};
use std::ascii::AsciiExt;
use std::fmt;
use style_traits::ToCss;
use values::HasViewportPercentage;
use values::computed::{ComputedValueAsSpecified, Context, ToComputedValue};
use values::computed::basic_shape as computed_basic_shape;
use values::specified::{BorderRadiusSize, LengthOrPercentage, Percentage};
@ -861,4 +862,4 @@ define_css_keyword_enum!(ShapeBox:
"content-box" => ContentBox
);
impl ComputedValueAsSpecified for ShapeBox {}
add_impls_for_keyword_enum!(ShapeBox);