style: Add a ValueInfo trait for exposing types needed by devtools.

Most of types just derive it using proc_macro directly. Some of value
types need manual impl.

In my current plan, this new trait will be used in bug 1434130 to expose
values as well.

Bug: 1455576
Reviewed-by: emilio
MozReview-Commit-ID: LI7fy45VkRw
This commit is contained in:
Xidorn Quan 2018-04-26 09:01:02 +10:00 committed by Emilio Cobos Álvarez
parent 276fb7e04b
commit 7fe7b2ffb1
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66 changed files with 615 additions and 249 deletions

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@ -17,7 +17,8 @@ use servo_url::ServoUrl;
use std::cmp::Ordering;
use std::f32::consts::PI;
use std::fmt::{self, Write};
use style_traits::{CssWriter, ParseError, StyleParseErrorKind, ToCss};
use style_traits::{CssType, CssWriter, ParseError, StyleParseErrorKind};
use style_traits::{SpecifiedValueInfo, ToCss};
use values::{Either, None_};
#[cfg(feature = "gecko")]
use values::computed::{Context, Position as ComputedPosition, ToComputedValue};
@ -54,6 +55,10 @@ pub type Gradient = generic::Gradient<
Angle,
>;
impl SpecifiedValueInfo for Gradient {
const SUPPORTED_TYPES: u8 = CssType::GRADIENT;
}
/// A specified gradient kind.
#[cfg(not(feature = "gecko"))]
pub type GradientKind =