forked from mirrors/gecko-dev
68b65ee807
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. MozReview-Commit-ID: LI7fy45VkRw --HG-- extra : rebase_source : a765e43b0c615e5f47bddb90ba6fa24bfc06959e extra : source : 60812c1b190d90602bc6d49477fe1f558a53cd51
111 lines
3.2 KiB
Rust
111 lines
3.2 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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macro_rules! exclusive_value {
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(($value:ident, $set:expr) => $ident:path) => {
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if $value.intersects($set) {
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return Err(());
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} else {
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$ident
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}
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};
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}
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#[cfg(feature = "gecko")]
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macro_rules! impl_gecko_keyword_conversions {
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($name:ident, $utype:ty) => {
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impl From<$utype> for $name {
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fn from(bits: $utype) -> $name {
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$name::from_gecko_keyword(bits)
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}
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}
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impl From<$name> for $utype {
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fn from(v: $name) -> $utype {
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v.to_gecko_keyword()
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}
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}
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};
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}
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macro_rules! trivial_to_computed_value {
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($name:ty) => {
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impl $crate::values::computed::ToComputedValue for $name {
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type ComputedValue = $name;
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fn to_computed_value(&self, _: &$crate::values::computed::Context) -> Self {
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self.clone()
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}
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fn from_computed_value(other: &Self) -> Self {
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other.clone()
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}
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}
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};
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}
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/// A macro to parse an identifier, or return an `UnexpectedIdent` 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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($input:expr, $( $match_body:tt )*) => {{
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let location = $input.current_source_location();
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let ident = $input.expect_ident_cloned()?;
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match_ignore_ascii_case! { &ident,
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$( $match_body )*
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_ => return Err(location.new_custom_error(
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::selectors::parser::SelectorParseErrorKind::UnexpectedIdent(ident.clone())
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))
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}
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}}
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}
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macro_rules! define_keyword_type {
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($name:ident, $css:expr) => {
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#[allow(missing_docs)]
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#[derive(Animate, Clone, ComputeSquaredDistance, Copy, MallocSizeOf,
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PartialEq, SpecifiedValueInfo, ToAnimatedValue, ToAnimatedZero,
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ToComputedValue, ToCss)]
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pub struct $name;
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impl fmt::Debug for $name {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.write_str($css)
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}
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}
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impl $crate::parser::Parse for $name {
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fn parse<'i, 't>(
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_context: &$crate::parser::ParserContext,
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input: &mut ::cssparser::Parser<'i, 't>,
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) -> Result<$name, ::style_traits::ParseError<'i>> {
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input
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.expect_ident_matching($css)
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.map(|_| $name)
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.map_err(|e| e.into())
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}
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}
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};
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}
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#[cfg(feature = "gecko")]
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macro_rules! impl_bitflags_conversions {
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($name:ident) => {
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impl From<u8> for $name {
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fn from(bits: u8) -> $name {
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$name::from_bits(bits).expect("bits contain valid flag")
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}
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}
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impl From<$name> for u8 {
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fn from(v: $name) -> u8 {
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v.bits()
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}
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}
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};
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}
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