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use super::SelectorError;
use crate::html::Namespace;
use cssparser::{Parser as CssParser, ParserInput, ToCss};
use selectors::parser::{
Combinator, Component, NonTSPseudoClass, Parser, PseudoElement, SelectorImpl, SelectorList,
SelectorParseErrorKind,
};
use std::fmt;
use std::str::FromStr;
#[derive(Debug, Clone, PartialEq)]
pub struct SelectorImplDescriptor;
impl SelectorImpl for SelectorImplDescriptor {
type AttrValue = String;
type Identifier = String;
type ClassName = String;
type LocalName = String;
type NamespacePrefix = String;
type NamespaceUrl = Namespace;
type BorrowedNamespaceUrl = Namespace;
type BorrowedLocalName = String;
type NonTSPseudoClass = NonTSPseudoClassStub;
type PseudoElement = PseudoElementStub;
type ExtraMatchingData = ();
}
#[derive(PartialEq, Eq, Clone, Debug, Hash)]
pub enum PseudoElementStub {}
impl ToCss for PseudoElementStub {
fn to_css<W: fmt::Write>(&self, _dest: &mut W) -> fmt::Result {
match *self {}
}
}
impl PseudoElement for PseudoElementStub {
type Impl = SelectorImplDescriptor;
}
#[derive(PartialEq, Eq, Clone, Debug, Hash)]
pub enum NonTSPseudoClassStub {}
impl NonTSPseudoClass for NonTSPseudoClassStub {
type Impl = SelectorImplDescriptor;
fn is_active_or_hover(&self) -> bool {
match *self {}
}
}
impl ToCss for NonTSPseudoClassStub {
fn to_css<W: fmt::Write>(&self, _dest: &mut W) -> fmt::Result {
match *self {}
}
}
#[allow(dead_code)]
struct SelectorsParser;
impl SelectorsParser {
fn validate_component(
component: &Component<SelectorImplDescriptor>,
) -> Result<(), SelectorError> {
#[deny(clippy::wildcard_enum_match_arm)]
match component {
Component::Combinator(combinator) => match combinator {
Combinator::Child | Combinator::Descendant => Ok(()),
Combinator::NextSibling => Err(SelectorError::UnsupportedCombinator('+')),
Combinator::LaterSibling => Err(SelectorError::UnsupportedCombinator('~')),
Combinator::PseudoElement | Combinator::SlotAssignment => {
unreachable!("Pseudo element combinators should be filtered out at this point")
}
},
Component::LocalName(_)
| Component::ExplicitUniversalType
| Component::ExplicitAnyNamespace
| Component::ExplicitNoNamespace
| Component::ID(_)
| Component::Class(_)
| Component::AttributeInNoNamespaceExists { .. }
| Component::AttributeInNoNamespace { .. } => Ok(()),
Component::Negation(components) => {
components.iter().map(Self::validate_component).collect()
}
Component::Empty
| Component::FirstChild
| Component::FirstOfType
| Component::Host(_)
| Component::LastChild
| Component::LastOfType
| Component::NthChild(_, _)
| Component::NthLastChild(_, _)
| Component::NthLastOfType(_, _)
| Component::NthOfType(_, _)
| Component::OnlyChild
| Component::OnlyOfType
| Component::Root
| Component::Scope
| Component::PseudoElement(_)
| Component::NonTSPseudoClass(_)
| Component::Slotted(_) => Err(SelectorError::UnsupportedPseudoClassOrElement),
Component::DefaultNamespace(_)
| Component::Namespace(_, _)
| Component::AttributeOther(_) => Err(SelectorError::NamespacedSelector),
}
}
fn validate(
selector_list: SelectorList<SelectorImplDescriptor>,
) -> Result<SelectorList<SelectorImplDescriptor>, SelectorError> {
for selector in selector_list.0.iter() {
for component in selector.iter_raw_match_order() {
Self::validate_component(component)?;
}
}
Ok(selector_list)
}
#[inline]
pub fn parse(selector: &str) -> Result<SelectorList<SelectorImplDescriptor>, SelectorError> {
let mut input = ParserInput::new(selector);
let mut css_parser = CssParser::new(&mut input);
SelectorList::parse(&Self, &mut css_parser)
.map_err(SelectorError::from)
.and_then(Self::validate)
}
}
impl<'i> Parser<'i> for SelectorsParser {
type Impl = SelectorImplDescriptor;
type Error = SelectorParseErrorKind<'i>;
}
#[derive(Debug)]
pub struct Selector(pub(crate) SelectorList<SelectorImplDescriptor>);
impl FromStr for Selector {
type Err = SelectorError;
#[inline]
fn from_str(selector: &str) -> Result<Self, Self::Err> {
Ok(Selector(SelectorsParser::parse(selector)?))
}
}