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Diffstat (limited to 'servo/components/style/gecko/pseudo_element_definition.mako.rs')
| -rw-r--r-- | servo/components/style/gecko/pseudo_element_definition.mako.rs | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/servo/components/style/gecko/pseudo_element_definition.mako.rs b/servo/components/style/gecko/pseudo_element_definition.mako.rs new file mode 100644 index 0000000000..48f0618502 --- /dev/null +++ b/servo/components/style/gecko/pseudo_element_definition.mako.rs @@ -0,0 +1,278 @@ +/* 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/. */ + +/// Gecko's pseudo-element definition. +/// +/// We intentionally double-box legacy ::-moz-tree pseudo-elements to keep the +/// size of PseudoElement (and thus selector components) small. +#[derive(Clone, Debug, Eq, Hash, MallocSizeOf, PartialEq, ToShmem)] +pub enum PseudoElement { + % for pseudo in PSEUDOS: + /// ${pseudo.value} + % if pseudo.is_tree_pseudo_element(): + ${pseudo.capitalized_pseudo()}(thin_vec::ThinVec<Atom>), + % elif pseudo.pseudo_ident == "highlight": + ${pseudo.capitalized_pseudo()}(AtomIdent), + % else: + ${pseudo.capitalized_pseudo()}, + % endif + % endfor + /// ::-webkit-* that we don't recognize + /// https://github.com/whatwg/compat/issues/103 + UnknownWebkit(Atom), +} + +/// Important: If you change this, you should also update Gecko's +/// nsCSSPseudoElements::IsEagerlyCascadedInServo. +<% EAGER_PSEUDOS = ["Before", "After", "FirstLine", "FirstLetter"] %> +<% TREE_PSEUDOS = [pseudo for pseudo in PSEUDOS if pseudo.is_tree_pseudo_element()] %> +<% SIMPLE_PSEUDOS = [pseudo for pseudo in PSEUDOS if pseudo.is_simple_pseudo_element()] %> + +/// The number of eager pseudo-elements. +pub const EAGER_PSEUDO_COUNT: usize = ${len(EAGER_PSEUDOS)}; + +/// The number of non-functional pseudo-elements. +pub const SIMPLE_PSEUDO_COUNT: usize = ${len(SIMPLE_PSEUDOS)}; + +/// The number of tree pseudo-elements. +pub const TREE_PSEUDO_COUNT: usize = ${len(TREE_PSEUDOS)}; + +/// The number of all pseudo-elements. +pub const PSEUDO_COUNT: usize = ${len(PSEUDOS)}; + +/// The list of eager pseudos. +pub const EAGER_PSEUDOS: [PseudoElement; EAGER_PSEUDO_COUNT] = [ + % for eager_pseudo_name in EAGER_PSEUDOS: + PseudoElement::${eager_pseudo_name}, + % endfor +]; + +<%def name="pseudo_element_variant(pseudo, tree_arg='..')">\ +PseudoElement::${pseudo.capitalized_pseudo()}${"({})".format(tree_arg) if not pseudo.is_simple_pseudo_element() else ""}\ +</%def> + +impl PseudoElement { + /// Returns an index of the pseudo-element. + #[inline] + pub fn index(&self) -> usize { + match *self { + % for i, pseudo in enumerate(PSEUDOS): + ${pseudo_element_variant(pseudo)} => ${i}, + % endfor + PseudoElement::UnknownWebkit(..) => unreachable!(), + } + } + + /// Returns an array of `None` values. + /// + /// FIXME(emilio): Integer generics can't come soon enough. + pub fn pseudo_none_array<T>() -> [Option<T>; PSEUDO_COUNT] { + [ + ${",\n ".join(["None" for pseudo in PSEUDOS])} + ] + } + + /// Whether this pseudo-element is an anonymous box. + #[inline] + pub fn is_anon_box(&self) -> bool { + match *self { + % for pseudo in PSEUDOS: + % if pseudo.is_anon_box(): + ${pseudo_element_variant(pseudo)} => true, + % endif + % endfor + _ => false, + } + } + + /// Whether this pseudo-element is eagerly-cascaded. + #[inline] + pub fn is_eager(&self) -> bool { + matches!(*self, + ${" | ".join(map(lambda name: "PseudoElement::{}".format(name), EAGER_PSEUDOS))}) + } + + /// Whether this pseudo-element is tree pseudo-element. + #[inline] + pub fn is_tree_pseudo_element(&self) -> bool { + match *self { + % for pseudo in TREE_PSEUDOS: + ${pseudo_element_variant(pseudo)} => true, + % endfor + _ => false, + } + } + + /// Whether this pseudo-element is an unknown Webkit-prefixed pseudo-element. + #[inline] + pub fn is_unknown_webkit_pseudo_element(&self) -> bool { + matches!(*self, PseudoElement::UnknownWebkit(..)) + } + + /// Gets the flags associated to this pseudo-element, or 0 if it's an + /// anonymous box. + pub fn flags(&self) -> u32 { + match *self { + % for pseudo in PSEUDOS: + ${pseudo_element_variant(pseudo)} => + % if pseudo.is_tree_pseudo_element(): + structs::CSS_PSEUDO_ELEMENT_ENABLED_IN_UA_SHEETS_AND_CHROME, + % elif pseudo.is_anon_box(): + structs::CSS_PSEUDO_ELEMENT_ENABLED_IN_UA_SHEETS, + % else: + structs::SERVO_CSS_PSEUDO_ELEMENT_FLAGS_${pseudo.pseudo_ident}, + % endif + % endfor + PseudoElement::UnknownWebkit(..) => 0, + } + } + + /// Construct a pseudo-element from a `PseudoStyleType`. + #[inline] + pub fn from_pseudo_type(type_: PseudoStyleType, functional_pseudo_parameter: Option<AtomIdent>) -> Option<Self> { + match type_ { + % for pseudo in PSEUDOS: + % if pseudo.is_simple_pseudo_element(): + PseudoStyleType::${pseudo.pseudo_ident} => { + debug_assert!(functional_pseudo_parameter.is_none()); + Some(${pseudo_element_variant(pseudo)}) + }, + % endif + % endfor + PseudoStyleType::highlight => { + match functional_pseudo_parameter { + Some(p) => Some(PseudoElement::Highlight(p)), + None => None + } + } + _ => None, + } + } + + /// Construct a `PseudoStyleType` from a pseudo-element + #[inline] + pub fn pseudo_type(&self) -> PseudoStyleType { + match *self { + % for pseudo in PSEUDOS: + % if pseudo.is_tree_pseudo_element(): + PseudoElement::${pseudo.capitalized_pseudo()}(..) => PseudoStyleType::XULTree, + % elif pseudo.pseudo_ident == "highlight": + PseudoElement::${pseudo.capitalized_pseudo()}(..) => PseudoStyleType::${pseudo.pseudo_ident}, + % else: + PseudoElement::${pseudo.capitalized_pseudo()} => PseudoStyleType::${pseudo.pseudo_ident}, + % endif + % endfor + PseudoElement::UnknownWebkit(..) => unreachable!(), + } + } + + /// Get the argument list of a tree pseudo-element. + #[inline] + pub fn tree_pseudo_args(&self) -> Option<<&[Atom]> { + match *self { + % for pseudo in TREE_PSEUDOS: + PseudoElement::${pseudo.capitalized_pseudo()}(ref args) => Some(args), + % endfor + _ => None, + } + } + + /// Construct a tree pseudo-element from atom and args. + #[inline] + pub fn from_tree_pseudo_atom(atom: &Atom, args: Box<[Atom]>) -> Option<Self> { + % for pseudo in PSEUDOS: + % if pseudo.is_tree_pseudo_element(): + if atom == &atom!("${pseudo.value}") { + return Some(PseudoElement::${pseudo.capitalized_pseudo()}(args.into())); + } + % endif + % endfor + None + } + + /// Constructs a pseudo-element from a string of text. + /// + /// Returns `None` if the pseudo-element is not recognised. + #[inline] + pub fn from_slice(name: &str, allow_unkown_webkit: bool) -> Option<Self> { + // We don't need to support tree pseudos because functional + // pseudo-elements needs arguments, and thus should be created + // via other methods. + ascii_case_insensitive_phf_map! { + pseudo -> PseudoElement = { + % for pseudo in SIMPLE_PSEUDOS: + "${pseudo.value[1:]}" => ${pseudo_element_variant(pseudo)}, + % endfor + // Alias some legacy prefixed pseudos to their standardized name at parse time: + "-moz-selection" => PseudoElement::Selection, + "-moz-placeholder" => PseudoElement::Placeholder, + "-moz-list-bullet" => PseudoElement::Marker, + "-moz-list-number" => PseudoElement::Marker, + } + } + if let Some(p) = pseudo::get(name) { + return Some(p.clone()); + } + if starts_with_ignore_ascii_case(name, "-moz-tree-") { + return PseudoElement::tree_pseudo_element(name, Default::default()) + } + const WEBKIT_PREFIX: &str = "-webkit-"; + if allow_unkown_webkit && starts_with_ignore_ascii_case(name, WEBKIT_PREFIX) { + let part = string_as_ascii_lowercase(&name[WEBKIT_PREFIX.len()..]); + return Some(PseudoElement::UnknownWebkit(part.into())); + } + None + } + + /// Constructs a tree pseudo-element from the given name and arguments. + /// "name" must start with "-moz-tree-". + /// + /// Returns `None` if the pseudo-element is not recognized. + #[inline] + pub fn tree_pseudo_element(name: &str, args: thin_vec::ThinVec<Atom>) -> Option<Self> { + debug_assert!(starts_with_ignore_ascii_case(name, "-moz-tree-")); + let tree_part = &name[10..]; + % for pseudo in TREE_PSEUDOS: + if tree_part.eq_ignore_ascii_case("${pseudo.value[11:]}") { + return Some(${pseudo_element_variant(pseudo, "args")}); + } + % endfor + None + } +} + +impl ToCss for PseudoElement { + fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write { + dest.write_char(':')?; + match *self { + % for pseudo in (p for p in PSEUDOS if p.pseudo_ident != "highlight"): + ${pseudo_element_variant(pseudo)} => dest.write_str("${pseudo.value}")?, + % endfor + PseudoElement::Highlight(ref name) => { + dest.write_str(":highlight(")?; + serialize_atom_identifier(name, dest)?; + dest.write_char(')')?; + } + PseudoElement::UnknownWebkit(ref atom) => { + dest.write_str(":-webkit-")?; + serialize_atom_identifier(atom, dest)?; + } + } + if let Some(args) = self.tree_pseudo_args() { + if !args.is_empty() { + dest.write_char('(')?; + let mut iter = args.iter(); + if let Some(first) = iter.next() { + serialize_atom_identifier(&first, dest)?; + for item in iter { + dest.write_str(", ")?; + serialize_atom_identifier(item, dest)?; + } + } + dest.write_char(')')?; + } + } + Ok(()) + } +} |