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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! Various macro helpers.
macro_rules! trivial_to_computed_value {
($name:ty) => {
impl $crate::values::computed::ToComputedValue for $name {
type ComputedValue = $name;
fn to_computed_value(&self, _: &$crate::values::computed::Context) -> Self {
self.clone()
}
fn from_computed_value(other: &Self) -> Self {
other.clone()
}
}
}
}
/// A macro to parse an identifier, or return an `UnexpectedIndent` error
/// otherwise.
///
/// FIXME(emilio): The fact that `UnexpectedIdent` is a `SelectorParseError`
/// doesn't make a lot of sense to me.
macro_rules! try_match_ident_ignore_ascii_case {
($input:expr, $( $match_body:tt )*) => {
let location = $input.current_source_location();
let ident = $input.expect_ident_cloned()?;
(match_ignore_ascii_case! { &ident,
$( $match_body )*
_ => Err(()),
})
.map_err(|()| {
location.new_custom_error(
::selectors::parser::SelectorParseErrorKind::UnexpectedIdent(ident.clone())
)
})
}
}
macro_rules! define_numbered_css_keyword_enum {
($name: ident: $( $css: expr => $variant: ident = $value: expr ),+,) => {
define_numbered_css_keyword_enum!($name: $( $css => $variant = $value ),+);
};
($name: ident: $( $css: expr => $variant: ident = $value: expr ),+) => {
#[allow(non_camel_case_types, missing_docs)]
#[derive(Clone, Copy, Debug, Eq, MallocSizeOf, Ord, PartialEq, PartialOrd)]
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
pub enum $name {
$( $variant = $value ),+
}
impl $crate::parser::Parse for $name {
fn parse<'i, 't>(
_context: &$crate::parser::ParserContext,
input: &mut ::cssparser::Parser<'i, 't>,
) -> Result<$name, ::style_traits::ParseError<'i>> {
try_match_ident_ignore_ascii_case! { input,
$( $css => Ok($name::$variant), )+
}
}
}
impl ::style_traits::values::ToCss for $name {
fn to_css<W>(&self, dest: &mut W) -> ::std::fmt::Result
where
W: ::std::fmt::Write,
{
match *self {
$( $name::$variant => dest.write_str($css) ),+
}
}
}
}
}
/// A macro for implementing `ToComputedValue`, and `Parse` traits for
/// the enums defined using `define_css_keyword_enum` macro.
///
/// NOTE: We should either move `Parse` trait to `style_traits`
/// or `define_css_keyword_enum` macro to this crate, but that
/// may involve significant cleanup in both the crates.
macro_rules! add_impls_for_keyword_enum {
($name:ident) => {
impl $crate::parser::Parse for $name {
#[inline]
fn parse<'i, 't>(
_context: &$crate::parser::ParserContext,
input: &mut ::cssparser::Parser<'i, 't>,
) -> Result<Self, ::style_traits::ParseError<'i>> {
$name::parse(input)
}
}
trivial_to_computed_value!($name);
};
}
macro_rules! define_keyword_type {
($name: ident, $css: expr) => {
#[allow(missing_docs)]
#[derive(Animate, Clone, ComputeSquaredDistance, Copy, MallocSizeOf, PartialEq)]
#[derive(ToAnimatedZero, ToComputedValue, ToCss)]
pub struct $name;
impl fmt::Debug for $name {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str($css)
}
}
impl $crate::parser::Parse for $name {
fn parse<'i, 't>(
_context: &$crate::parser::ParserContext,
input: &mut ::cssparser::Parser<'i, 't>
) -> Result<$name, ::style_traits::ParseError<'i>> {
input.expect_ident_matching($css).map(|_| $name).map_err(|e| e.into())
}
}
impl $crate::values::animated::AnimatedValueAsComputed for $name {}
};
}
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