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//! HIR for references to types. Paths in these are not yet resolved. They can
//! be directly created from an ast::TypeRef, without further queries.
use ra_syntax::ast::{self, TypeAscriptionOwner, TypeBoundsOwner};
use crate::Path;
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
pub enum Mutability {
Shared,
Mut,
}
impl Mutability {
pub fn from_mutable(mutable: bool) -> Mutability {
if mutable {
Mutability::Mut
} else {
Mutability::Shared
}
}
pub fn as_keyword_for_ref(self) -> &'static str {
match self {
Mutability::Shared => "",
Mutability::Mut => "mut ",
}
}
pub fn as_keyword_for_ptr(self) -> &'static str {
match self {
Mutability::Shared => "const ",
Mutability::Mut => "mut ",
}
}
}
/// Compare ty::Ty
#[derive(Clone, PartialEq, Eq, Hash, Debug)]
pub enum TypeRef {
Never,
Placeholder,
Tuple(Vec<TypeRef>),
Path(Path),
RawPtr(Box<TypeRef>, Mutability),
Reference(Box<TypeRef>, Mutability),
Array(Box<TypeRef> /*, Expr*/),
Slice(Box<TypeRef>),
/// A fn pointer. Last element of the vector is the return type.
Fn(Vec<TypeRef>),
// For
ImplTrait(Vec<TypeBound>),
DynTrait(Vec<TypeBound>),
Error,
}
#[derive(Clone, PartialEq, Eq, Hash, Debug)]
pub enum TypeBound {
Path(Path),
// also for<> bounds
// also Lifetimes
Error,
}
impl TypeRef {
/// Converts an `ast::TypeRef` to a `hir::TypeRef`.
pub(crate) fn from_ast(node: ast::TypeRef) -> Self {
match node {
ast::TypeRef::ParenType(inner) => TypeRef::from_ast_opt(inner.type_ref()),
ast::TypeRef::TupleType(inner) => {
TypeRef::Tuple(inner.fields().map(TypeRef::from_ast).collect())
}
ast::TypeRef::NeverType(..) => TypeRef::Never,
ast::TypeRef::PathType(inner) => {
// FIXME: Use `Path::from_src`
inner.path().and_then(Path::from_ast).map(TypeRef::Path).unwrap_or(TypeRef::Error)
}
ast::TypeRef::PointerType(inner) => {
let inner_ty = TypeRef::from_ast_opt(inner.type_ref());
let mutability = Mutability::from_mutable(inner.is_mut());
TypeRef::RawPtr(Box::new(inner_ty), mutability)
}
ast::TypeRef::ArrayType(inner) => {
TypeRef::Array(Box::new(TypeRef::from_ast_opt(inner.type_ref())))
}
ast::TypeRef::SliceType(inner) => {
TypeRef::Slice(Box::new(TypeRef::from_ast_opt(inner.type_ref())))
}
ast::TypeRef::ReferenceType(inner) => {
let inner_ty = TypeRef::from_ast_opt(inner.type_ref());
let mutability = Mutability::from_mutable(inner.is_mut());
TypeRef::Reference(Box::new(inner_ty), mutability)
}
ast::TypeRef::PlaceholderType(_inner) => TypeRef::Placeholder,
ast::TypeRef::FnPointerType(inner) => {
let ret_ty = TypeRef::from_ast_opt(inner.ret_type().and_then(|rt| rt.type_ref()));
let mut params = if let Some(pl) = inner.param_list() {
pl.params().map(|p| p.ascribed_type()).map(TypeRef::from_ast_opt).collect()
} else {
Vec::new()
};
params.push(ret_ty);
TypeRef::Fn(params)
}
// for types are close enough for our purposes to the inner type for now...
ast::TypeRef::ForType(inner) => TypeRef::from_ast_opt(inner.type_ref()),
ast::TypeRef::ImplTraitType(inner) => {
TypeRef::ImplTrait(type_bounds_from_ast(inner.type_bound_list()))
}
ast::TypeRef::DynTraitType(inner) => {
TypeRef::DynTrait(type_bounds_from_ast(inner.type_bound_list()))
}
}
}
pub(crate) fn from_ast_opt(node: Option<ast::TypeRef>) -> Self {
if let Some(node) = node {
TypeRef::from_ast(node)
} else {
TypeRef::Error
}
}
pub fn unit() -> TypeRef {
TypeRef::Tuple(Vec::new())
}
}
pub(crate) fn type_bounds_from_ast(type_bounds_opt: Option<ast::TypeBoundList>) -> Vec<TypeBound> {
if let Some(type_bounds) = type_bounds_opt {
type_bounds.bounds().map(TypeBound::from_ast).collect()
} else {
vec![]
}
}
impl TypeBound {
pub(crate) fn from_ast(node: ast::TypeBound) -> Self {
match node.kind() {
ast::TypeBoundKind::PathType(path_type) => {
let path = match path_type.path() {
Some(p) => p,
None => return TypeBound::Error,
};
// FIXME: Use `Path::from_src`
let path = match Path::from_ast(path) {
Some(p) => p,
None => return TypeBound::Error,
};
TypeBound::Path(path)
}
ast::TypeBoundKind::ForType(_) | ast::TypeBoundKind::Lifetime(_) => TypeBound::Error,
}
}
pub fn as_path(&self) -> Option<&Path> {
match self {
TypeBound::Path(p) => Some(p),
_ => None,
}
}
}
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