mirror of
https://github.com/mozilla/gecko-dev.git
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f5d5a4edf4
Source-Repo: https://github.com/servo/servo Source-Revision: d76d0978911e4823d9d40f7ed161de24f3cc7f61 --HG-- extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear extra : subtree_revision : b5b75d416d42e34b9aa6b496e0cfc858ff923328
122 lines
4.4 KiB
Rust
122 lines
4.4 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Various macro helpers.
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/// A macro to parse an identifier, or return an `UnexpectedIndent` error
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/// otherwise.
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///
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/// FIXME(emilio): The fact that `UnexpectedIdent` is a `SelectorParseError`
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/// doesn't make a lot of sense to me.
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macro_rules! try_match_ident_ignore_ascii_case {
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($ident:expr, $( $match_body:tt )*) => {
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let __ident = $ident;
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(match_ignore_ascii_case! { &*__ident,
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$( $match_body )*
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_ => Err(()),
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})
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.map_err(|()| {
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::selectors::parser::SelectorParseError::UnexpectedIdent(__ident).into()
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})
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}
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}
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macro_rules! define_numbered_css_keyword_enum {
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($name: ident: $( $css: expr => $variant: ident = $value: expr ),+,) => {
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define_numbered_css_keyword_enum!($name: $( $css => $variant = $value ),+);
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};
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($name: ident: $( $css: expr => $variant: ident = $value: expr ),+) => {
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#[allow(non_camel_case_types, missing_docs)]
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#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
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#[cfg_attr(feature = "servo", derive(HeapSizeOf, Deserialize, Serialize))]
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pub enum $name {
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$( $variant = $value ),+
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}
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impl $crate::parser::Parse for $name {
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#[allow(missing_docs)]
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fn parse<'i, 't>(_context: &$crate::parser::ParserContext,
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input: &mut ::cssparser::Parser<'i, 't>)
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-> Result<$name, ::style_traits::ParseError<'i>> {
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try_match_ident_ignore_ascii_case! { input.expect_ident()?,
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$( $css => Ok($name::$variant), )+
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}
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}
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}
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impl ::style_traits::values::ToCss for $name {
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fn to_css<W>(&self, dest: &mut W) -> ::std::fmt::Result
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where W: ::std::fmt::Write,
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{
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match *self {
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$( $name::$variant => dest.write_str($css) ),+
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}
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}
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}
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}
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}
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/// A macro for implementing `ComputedValueAsSpecified`, `Parse`
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/// and `HasViewportPercentage` traits for the enums defined
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/// using `define_css_keyword_enum` macro.
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///
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/// NOTE: We should either move `Parse` trait to `style_traits`
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/// or `define_css_keyword_enum` macro to this crate, but that
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/// may involve significant cleanup in both the crates.
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macro_rules! add_impls_for_keyword_enum {
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($name:ident) => {
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impl $crate::parser::Parse for $name {
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#[inline]
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fn parse<'i, 't>(_context: &$crate::parser::ParserContext,
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input: &mut ::cssparser::Parser<'i, 't>)
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-> Result<Self, ::style_traits::ParseError<'i>> {
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$name::parse(input)
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}
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}
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impl $crate::values::computed::ComputedValueAsSpecified for $name {}
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no_viewport_percentage!($name);
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};
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}
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macro_rules! define_keyword_type {
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($name: ident, $css: expr) => {
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#[allow(missing_docs)]
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#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
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#[derive(Clone, Copy, PartialEq, ToCss)]
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pub struct $name;
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impl $crate::properties::animated_properties::Animatable for $name {
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#[inline]
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fn add_weighted(&self, _other: &Self, _self_progress: f64, _other_progress: f64)
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-> Result<Self, ()> {
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Ok($name)
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}
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}
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impl fmt::Debug for $name {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, $css)
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}
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}
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impl $crate::parser::Parse for $name {
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fn parse<'i, 't>(_context: &$crate::parser::ParserContext,
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input: &mut ::cssparser::Parser<'i, 't>)
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-> Result<$name, ::style_traits::ParseError<'i>> {
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input.expect_ident_matching($css).map(|_| $name).map_err(|e| e.into())
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}
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}
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impl $crate::values::computed::ComputedValueAsSpecified for $name {}
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impl $crate::values::animated::AnimatedValueAsComputed for $name {}
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no_viewport_percentage!($name);
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impl $crate::values::animated::ToAnimatedZero for $name {
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#[inline]
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fn to_animated_zero(&self) -> Result<Self, ()> { Ok($name) }
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}
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};
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}
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