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//! Helper functions for binary operator type inference.
use chalk_ir::TyVariableKind;
use hir_def::expr::{ArithOp, BinaryOp, CmpOp};
use crate::{Scalar, Ty};
pub(super) fn binary_op_return_ty(op: BinaryOp, lhs_ty: Ty, rhs_ty: Ty) -> Ty {
match op {
BinaryOp::LogicOp(_) | BinaryOp::CmpOp(_) => Ty::Scalar(Scalar::Bool),
BinaryOp::Assignment { .. } => Ty::unit(),
BinaryOp::ArithOp(ArithOp::Shl) | BinaryOp::ArithOp(ArithOp::Shr) => match lhs_ty {
Ty::Scalar(Scalar::Int(_))
| Ty::Scalar(Scalar::Uint(_))
| Ty::Scalar(Scalar::Float(_)) => lhs_ty,
Ty::InferenceVar(_, TyVariableKind::Integer)
| Ty::InferenceVar(_, TyVariableKind::Float) => lhs_ty,
_ => Ty::Unknown,
},
BinaryOp::ArithOp(_) => match rhs_ty {
Ty::Scalar(Scalar::Int(_))
| Ty::Scalar(Scalar::Uint(_))
| Ty::Scalar(Scalar::Float(_)) => rhs_ty,
Ty::InferenceVar(_, TyVariableKind::Integer)
| Ty::InferenceVar(_, TyVariableKind::Float) => rhs_ty,
_ => Ty::Unknown,
},
}
}
pub(super) fn binary_op_rhs_expectation(op: BinaryOp, lhs_ty: Ty) -> Ty {
match op {
BinaryOp::LogicOp(..) => Ty::Scalar(Scalar::Bool),
BinaryOp::Assignment { op: None } => lhs_ty,
BinaryOp::CmpOp(CmpOp::Eq { .. }) => match lhs_ty {
Ty::Scalar(_) | Ty::Str => lhs_ty,
Ty::InferenceVar(_, TyVariableKind::Integer)
| Ty::InferenceVar(_, TyVariableKind::Float) => lhs_ty,
_ => Ty::Unknown,
},
BinaryOp::ArithOp(ArithOp::Shl) | BinaryOp::ArithOp(ArithOp::Shr) => Ty::Unknown,
BinaryOp::CmpOp(CmpOp::Ord { .. })
| BinaryOp::Assignment { op: Some(_) }
| BinaryOp::ArithOp(_) => match lhs_ty {
Ty::Scalar(Scalar::Int(_))
| Ty::Scalar(Scalar::Uint(_))
| Ty::Scalar(Scalar::Float(_)) => lhs_ty,
Ty::InferenceVar(_, TyVariableKind::Integer)
| Ty::InferenceVar(_, TyVariableKind::Float) => lhs_ty,
_ => Ty::Unknown,
},
}
}
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