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-rw-r--r--servo/components/style/macros.rs98
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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 https://mozilla.org/MPL/2.0/. */
+
+//! Various macro helpers.
+
+macro_rules! exclusive_value {
+ (($value:ident, $set:expr) => $ident:path) => {
+ if $value.intersects($set) {
+ return Err(());
+ } else {
+ $ident
+ }
+ };
+}
+
+#[cfg(feature = "gecko")]
+macro_rules! impl_gecko_keyword_conversions {
+ ($name:ident, $utype:ty) => {
+ impl From<$utype> for $name {
+ fn from(bits: $utype) -> $name {
+ $name::from_gecko_keyword(bits)
+ }
+ }
+
+ impl From<$name> for $utype {
+ fn from(v: $name) -> $utype {
+ v.to_gecko_keyword()
+ }
+ }
+ };
+}
+
+macro_rules! trivial_to_computed_value {
+ ($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 `UnexpectedIdent` 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()?;
+ match_ignore_ascii_case! { &ident,
+ $( $match_body )*
+ _ => return Err(location.new_custom_error(
+ ::selectors::parser::SelectorParseErrorKind::UnexpectedIdent(ident.clone())
+ ))
+ }
+ }}
+}
+
+#[cfg(feature = "servo")]
+macro_rules! local_name {
+ ($s:tt) => {
+ $crate::values::GenericAtomIdent(html5ever::local_name!($s))
+ };
+}
+
+#[cfg(feature = "servo")]
+macro_rules! ns {
+ () => {
+ $crate::values::GenericAtomIdent(html5ever::ns!())
+ };
+ ($s:tt) => {
+ $crate::values::GenericAtomIdent(html5ever::ns!($s))
+ };
+}
+
+#[cfg(feature = "gecko")]
+macro_rules! local_name {
+ ($s:tt) => {
+ $crate::values::AtomIdent(atom!($s))
+ };
+}
+
+/// Asserts the size of a type at compile time.
+macro_rules! size_of_test {
+ ($t: ty, $expected_size: expr) => {
+ #[cfg(target_pointer_width = "64")]
+ const_assert_eq!(std::mem::size_of::<$t>(), $expected_size);
+ };
+}