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use middle::ty::{self, Ty};
use syntax::ast;
use self::SimplifiedType::*;
#[derive(Clone, Copy, PartialEq, Eq, Hash)]
pub enum SimplifiedType {
BoolSimplifiedType,
CharSimplifiedType,
IntSimplifiedType(ast::IntTy),
UintSimplifiedType(ast::UintTy),
FloatSimplifiedType(ast::FloatTy),
EnumSimplifiedType(ast::DefId),
StrSimplifiedType,
VecSimplifiedType,
PtrSimplifiedType,
TupleSimplifiedType(usize),
TraitSimplifiedType(ast::DefId),
StructSimplifiedType(ast::DefId),
ClosureSimplifiedType(ast::DefId),
FunctionSimplifiedType(usize),
ParameterSimplifiedType,
}
pub fn simplify_type(tcx: &ty::ctxt,
ty: Ty,
can_simplify_params: bool)
-> Option<SimplifiedType>
{
match ty.sty {
ty::ty_bool => Some(BoolSimplifiedType),
ty::ty_char => Some(CharSimplifiedType),
ty::ty_int(int_type) => Some(IntSimplifiedType(int_type)),
ty::ty_uint(uint_type) => Some(UintSimplifiedType(uint_type)),
ty::ty_float(float_type) => Some(FloatSimplifiedType(float_type)),
ty::ty_enum(def_id, _) => Some(EnumSimplifiedType(def_id)),
ty::ty_str => Some(StrSimplifiedType),
ty::ty_vec(..) => Some(VecSimplifiedType),
ty::ty_ptr(_) => Some(PtrSimplifiedType),
ty::ty_trait(ref trait_info) => {
Some(TraitSimplifiedType(trait_info.principal_def_id()))
}
ty::ty_struct(def_id, _) => {
Some(StructSimplifiedType(def_id))
}
ty::ty_rptr(_, mt) => {
simplify_type(tcx, mt.ty, can_simplify_params)
}
ty::ty_uniq(_) => {
let def_id = tcx.lang_items.owned_box().unwrap();
Some(StructSimplifiedType(def_id))
}
ty::ty_closure(def_id, _) => {
Some(ClosureSimplifiedType(def_id))
}
ty::ty_tup(ref tys) => {
Some(TupleSimplifiedType(tys.len()))
}
ty::ty_bare_fn(_, ref f) => {
Some(FunctionSimplifiedType(f.sig.0.inputs.len()))
}
ty::ty_projection(_) => {
None
}
ty::ty_param(_) => {
if can_simplify_params {
Some(ParameterSimplifiedType)
} else {
None
}
}
ty::ty_infer(_) | ty::ty_err => None,
}
}