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Start building out type inference.

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This commit is contained in:
Adam Wick
2023-06-21 21:56:54 -07:00
parent 3687785540
commit 1ad3d6c517
14 changed files with 1286 additions and 305 deletions
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56
src/eval/primtype.rs
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@@ -80,6 +80,62 @@ impl FromStr for PrimitiveType {
}
impl PrimitiveType {
/// Return true if this type can be safely cast into the target type.
pub fn can_cast_to(&self, target: &PrimitiveType) -> bool {
match self {
PrimitiveType::U8 => match target {
PrimitiveType::U8 => true,
PrimitiveType::U16 => true,
PrimitiveType::U32 => true,
PrimitiveType::U64 => true,
PrimitiveType::I16 => true,
PrimitiveType::I32 => true,
PrimitiveType::I64 => true,
_ => false,
},
PrimitiveType::U16 => match target {
PrimitiveType::U16 => true,
PrimitiveType::U32 => true,
PrimitiveType::U64 => true,
PrimitiveType::I32 => true,
PrimitiveType::I64 => true,
_ => false,
},
PrimitiveType::U32 => match target {
PrimitiveType::U32 => true,
PrimitiveType::U64 => true,
PrimitiveType::I64 => true,
_ => false,
},
PrimitiveType::U64 => match target {
PrimitiveType::U64 => true,
_ => false,
},
PrimitiveType::I8 => match target {
PrimitiveType::I8 => true,
PrimitiveType::I16 => true,
PrimitiveType::I32 => true,
PrimitiveType::I64 => true,
_ => false,
},
PrimitiveType::I16 => match target {
PrimitiveType::I16 => true,
PrimitiveType::I32 => true,
PrimitiveType::I64 => true,
_ => false,
},
PrimitiveType::I32 => match target {
PrimitiveType::I32 => true,
PrimitiveType::I64 => true,
_ => false,
},
PrimitiveType::I64 => match target {
PrimitiveType::I64 => true,
_ => false,
},
}
}
/// Try to cast the given value to this type, returning the new value.
///
/// Returns an error if the cast is not safe *in* *general*. This means that