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symbol_resolver: fixed type variable handling

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This commit is contained in:
pca006132 2021-08-12 10:25:32 +08:00
parent de8b67b605
commit d46a4b2d38
2 changed files with 42 additions and 25 deletions
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63
nac3core/src/symbol_resolver.rs
View File

@ -22,19 +22,22 @@ pub enum SymbolValue {
}
pub trait SymbolResolver {
// get type of type variable identifier or top-level function type
fn get_symbol_type(
&self,
unifier: &mut Unifier,
primitives: &PrimitiveStore,
str: &str,
) -> Option<Type>;
fn get_identifier_def(&self, str: &str) -> DefinitionId;
// get the top-level definition of identifiers
fn get_identifier_def(&self, str: &str) -> Option<DefinitionId>;
fn get_symbol_value(&self, str: &str) -> Option<SymbolValue>;
fn get_symbol_location(&self, str: &str) -> Option<Location>;
// handle function call etc.
}
impl dyn SymbolResolver {
// convert type annotation into type
pub fn parse_type_annotation<T>(
&self,
top_level: &TopLevelContext,
@ -52,29 +55,41 @@ impl dyn SymbolResolver {
"None" => Ok(primitives.none),
x => {
let obj_id = self.get_identifier_def(x);
let defs = top_level.definitions.read();
let def = defs[obj_id.0].read();
if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*def {
if !type_vars.is_empty() {
return Err(format!(
"Unexpected number of type parameters: expected {} but got 0",
type_vars.len()
));
if let Some(obj_id) = obj_id {
let defs = top_level.definitions.read();
let def = defs[obj_id.0].read();
if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*def {
if !type_vars.is_empty() {
return Err(format!(
"Unexpected number of type parameters: expected {} but got 0",
type_vars.len()
));
}
let fields = RefCell::new(
chain(
fields.iter().map(|(k, v)| (k.clone(), *v)),
methods.iter().map(|(k, v, _)| (k.clone(), *v)),
)
.collect(),
);
Ok(unifier.add_ty(TypeEnum::TObj {
obj_id,
fields,
params: Default::default(),
}))
} else {
Err("Cannot use function name as type".into())
}
let fields = RefCell::new(
chain(
fields.iter().map(|(k, v)| (k.clone(), *v)),
methods.iter().map(|(k, v, _)| (k.clone(), *v)),
)
.collect(),
);
Ok(unifier.add_ty(TypeEnum::TObj {
obj_id,
fields,
params: Default::default(),
}))
} else {
Err("Cannot use function name as type".into())
// it could be a type variable
let ty = self
.get_symbol_type(unifier, primitives, x)
.ok_or_else(|| "Cannot use function name as type".to_owned())?;
if let TypeEnum::TVar { .. } = &*unifier.get_ty(ty) {
Ok(ty)
} else {
Err(format!("Unknown type annotation {}", x))
}
}
}
},
@ -95,7 +110,9 @@ impl dyn SymbolResolver {
vec![self.parse_type_annotation(top_level, unifier, primitives, slice)?]
};
let obj_id = self.get_identifier_def(id);
let obj_id = self
.get_identifier_def(id)
.ok_or_else(|| format!("Unknown type annotation {}", id))?;
let defs = top_level.definitions.read();
let def = defs[obj_id.0].read();
if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*def {

4
nac3core/src/typecheck/type_inferencer/test.rs
View File

@ -28,8 +28,8 @@ impl SymbolResolver for Resolver {
unimplemented!()
}
fn get_identifier_def(&self, id: &str) -> DefinitionId {
self.id_to_def.get(id).cloned().unwrap()
fn get_identifier_def(&self, id: &str) -> Option<DefinitionId> {
self.id_to_def.get(id).cloned()
}
}