}
}
+impl<T, U> Clean<U> for ty::Binder<T> where T: Clean<U> {
+ fn clean(&self, cx: &DocContext) -> U {
+ self.0.clean(cx)
+ }
+}
+
impl<T: Clean<U>, U> Clean<Vec<U>> for syntax::owned_slice::OwnedSlice<T> {
fn clean(&self, cx: &DocContext) -> Vec<U> {
self.iter().map(|x| x.clean(cx)).collect()
}
}
-impl<'tcx> Clean<TyParamBound> for ty::PolyTraitRef<'tcx> {
- fn clean(&self, cx: &DocContext) -> TyParamBound {
- self.0.clean(cx)
- }
-}
-
impl<'tcx> Clean<TyParamBound> for ty::TraitRef<'tcx> {
fn clean(&self, cx: &DocContext) -> TyParamBound {
let tcx = match cx.tcx_opt() {
pub enum WherePredicate {
BoundPredicate { ty: Type, bounds: Vec<TyParamBound> },
RegionPredicate { lifetime: Lifetime, bounds: Vec<Lifetime>},
- // FIXME (#20041)
- EqPredicate
+ EqPredicate { lhs: Type, rhs: Type }
}
impl Clean<WherePredicate> for ast::WherePredicate {
}
ast::WherePredicate::EqPredicate(_) => {
- WherePredicate::EqPredicate
+ unimplemented!() // FIXME(#20041)
}
}
}
}
+impl<'a> Clean<WherePredicate> for ty::Predicate<'a> {
+ fn clean(&self, cx: &DocContext) -> WherePredicate {
+ use rustc::middle::ty::Predicate;
+
+ match *self {
+ Predicate::Trait(ref pred) => pred.clean(cx),
+ Predicate::Equate(ref pred) => pred.clean(cx),
+ Predicate::RegionOutlives(ref pred) => pred.clean(cx),
+ Predicate::TypeOutlives(ref pred) => pred.clean(cx),
+ Predicate::Projection(ref pred) => pred.clean(cx)
+ }
+ }
+}
+
+impl<'a> Clean<WherePredicate> for ty::TraitPredicate<'a> {
+ fn clean(&self, cx: &DocContext) -> WherePredicate {
+ WherePredicate::BoundPredicate {
+ ty: self.trait_ref.substs.self_ty().clean(cx).unwrap(),
+ bounds: vec![self.trait_ref.clean(cx)]
+ }
+ }
+}
+
+impl<'tcx> Clean<WherePredicate> for ty::EquatePredicate<'tcx> {
+ fn clean(&self, cx: &DocContext) -> WherePredicate {
+ let ty::EquatePredicate(ref lhs, ref rhs) = *self;
+ WherePredicate::EqPredicate {
+ lhs: lhs.clean(cx),
+ rhs: rhs.clean(cx)
+ }
+ }
+}
+
+impl Clean<WherePredicate> for ty::OutlivesPredicate<ty::Region, ty::Region> {
+ fn clean(&self, cx: &DocContext) -> WherePredicate {
+ let ty::OutlivesPredicate(ref a, ref b) = *self;
+ WherePredicate::RegionPredicate {
+ lifetime: a.clean(cx).unwrap(),
+ bounds: vec![b.clean(cx).unwrap()]
+ }
+ }
+}
+
+impl<'tcx> Clean<WherePredicate> for ty::OutlivesPredicate<ty::Ty<'tcx>, ty::Region> {
+ fn clean(&self, cx: &DocContext) -> WherePredicate {
+ let ty::OutlivesPredicate(ref ty, ref lt) = *self;
+
+ WherePredicate::BoundPredicate {
+ ty: ty.clean(cx),
+ bounds: vec![TyParamBound::RegionBound(lt.clean(cx).unwrap())]
+ }
+ }
+}
+
+impl<'tcx> Clean<WherePredicate> for ty::ProjectionPredicate<'tcx> {
+ fn clean(&self, cx: &DocContext) -> WherePredicate {
+ WherePredicate::EqPredicate {
+ lhs: self.projection_ty.clean(cx),
+ rhs: self.ty.clean(cx)
+ }
+ }
+}
+
+impl<'tcx> Clean<Type> for ty::ProjectionTy<'tcx> {
+ fn clean(&self, cx: &DocContext) -> Type {
+ let trait_ = match self.trait_ref.clean(cx) {
+ TyParamBound::TraitBound(t, _) => t.trait_,
+ TyParamBound::RegionBound(_) => panic!("cleaning a trait got a region??"),
+ };
+ Type::QPath {
+ name: self.item_name.clean(cx),
+ self_type: box self.trait_ref.self_ty().clean(cx),
+ trait_: box trait_
+ }
+ }
+}
+
// maybe use a Generic enum and use ~[Generic]?
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Show)]
pub struct Generics {
impl<'a, 'tcx> Clean<Generics> for (&'a ty::Generics<'tcx>, subst::ParamSpace) {
fn clean(&self, cx: &DocContext) -> Generics {
- let (me, space) = *self;
+ use std::collections::HashSet;
+ use syntax::ast::TraitBoundModifier as TBM;
+ use self::WherePredicate as WP;
+
+ fn has_sized_bound(bounds: &[TyParamBound], cx: &DocContext) -> bool {
+ if let Some(tcx) = cx.tcx_opt() {
+ let sized_did = match tcx.lang_items.sized_trait() {
+ Some(did) => did,
+ None => return false
+ };
+ for bound in bounds.iter() {
+ if let TyParamBound::TraitBound(PolyTrait {
+ trait_: Type::ResolvedPath { did, .. }, ..
+ }, TBM::None) = *bound {
+ if did == sized_did {
+ return true
+ }
+ }
+ }
+ }
+ false
+ }
+
+ let (gens, space) = *self;
+ // Bounds in the type_params and lifetimes fields are repeated in the predicates
+ // field (see rustc_typeck::collect::ty_generics), so remove them.
+ let stripped_typarams = gens.types.get_slice(space).iter().map(|tp| {
+ let mut stp = tp.clone();
+ stp.bounds = ty::ParamBounds::empty();
+ stp.clean(cx)
+ }).collect::<Vec<_>>();
+ let stripped_lifetimes = gens.regions.get_slice(space).iter().map(|rp| {
+ let mut srp = rp.clone();
+ srp.bounds = Vec::new();
+ srp.clean(cx)
+ }).collect::<Vec<_>>();
+
+ let where_predicates = gens.predicates.get_slice(space).to_vec().clean(cx);
+ // Type parameters have a Sized bound by default unless removed with ?Sized.
+ // Scan through the predicates and mark any type parameter with a Sized
+ // bound, removing the bounds as we find them.
+ let mut sized_params = HashSet::new();
+ let mut where_predicates = where_predicates.into_iter().filter_map(|pred| {
+ if let WP::BoundPredicate { ty: Type::Generic(ref g), ref bounds } = pred {
+ if has_sized_bound(&**bounds, cx) {
+ sized_params.insert(g.clone());
+ return None
+ }
+ }
+ Some(pred)
+ }).collect::<Vec<_>>();
+ // Finally, run through the type parameters again and insert a ?Sized unbound for
+ // any we didn't find to be Sized.
+ for tp in stripped_typarams.iter() {
+ if !sized_params.contains(&tp.name) {
+ let mut sized_bound = ty::BuiltinBound::BoundSized.clean(cx);
+ if let TyParamBound::TraitBound(_, ref mut tbm) = sized_bound {
+ *tbm = TBM::Maybe
+ };
+ where_predicates.push(WP::BoundPredicate {
+ ty: Type::Generic(tp.name.clone()),
+ bounds: vec![sized_bound]
+ })
+ }
+ }
+
+ // It would be nice to collect all of the bounds on a type and recombine
+ // them if possible, to avoid e.g. `where T: Foo, T: Bar, T: Sized, T: 'a`
+ // and instead see `where T: Foo + Bar + Sized + 'a`
+
Generics {
- type_params: me.types.get_slice(space).to_vec().clean(cx),
- lifetimes: me.regions.get_slice(space).to_vec().clean(cx),
- where_predicates: vec![]
+ type_params: stripped_typarams,
+ lifetimes: stripped_lifetimes,
+ where_predicates: where_predicates
}
}
}
projects / rust.git / commitdiff