hm-inference #6
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@ -36,8 +36,127 @@ pub trait SymbolResolver {
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// handle function call etc.
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}
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// convert type annotation into type
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pub fn parse_type_annotation<T>(
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resolver: &dyn SymbolResolver,
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top_level: &TopLevelContext,
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unifier: &mut Unifier,
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primitives: &PrimitiveStore,
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expr: &Expr<T>,
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) -> Result<Type, String> {
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use rustpython_parser::ast::ExprKind::*;
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match &expr.node {
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Name { id, .. } => match id.as_str() {
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"int32" => Ok(primitives.int32),
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"int64" => Ok(primitives.int64),
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"float" => Ok(primitives.float),
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"bool" => Ok(primitives.bool),
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"None" => Ok(primitives.none),
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x => {
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let obj_id = resolver.get_identifier_def(x);
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if let Some(obj_id) = obj_id {
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let defs = top_level.definitions.read();
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let def = defs[obj_id.0].read();
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if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*def {
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if !type_vars.is_empty() {
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return Err(format!(
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"Unexpected number of type parameters: expected {} but got 0",
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type_vars.len()
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));
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}
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let fields = RefCell::new(
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chain(
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fields.iter().map(|(k, v)| (k.clone(), *v)),
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methods.iter().map(|(k, v, _)| (k.clone(), *v)),
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)
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.collect(),
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);
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Ok(unifier.add_ty(TypeEnum::TObj {
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obj_id,
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fields,
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params: Default::default(),
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}))
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} else {
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Err("Cannot use function name as type".into())
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}
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} else {
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// it could be a type variable
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let ty = resolver
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.get_symbol_type(unifier, primitives, x)
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.ok_or_else(|| "Cannot use function name as type".to_owned())?;
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if let TypeEnum::TVar { .. } = &*unifier.get_ty(ty) {
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Ok(ty)
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} else {
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Err(format!("Unknown type annotation {}", x))
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}
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}
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}
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},
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Subscript { value, slice, .. } => {
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if let Name { id, .. } = &value.node {
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if id == "virtual" {
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let ty = parse_type_annotation(resolver, top_level, unifier, primitives, slice)?;
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Ok(unifier.add_ty(TypeEnum::TVirtual { ty }))
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} else {
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let types = if let Tuple { elts, .. } = &slice.node {
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elts.iter()
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.map(|v| parse_type_annotation(resolver, top_level, unifier, primitives, v))
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.collect::<Result<Vec<_>, _>>()?
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} else {
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vec![parse_type_annotation(resolver, top_level, unifier, primitives, slice)?]
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};
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let obj_id = resolver
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.get_identifier_def(id)
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.ok_or_else(|| format!("Unknown type annotation {}", id))?;
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let defs = top_level.definitions.read();
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let def = defs[obj_id.0].read();
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if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*def {
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if types.len() != type_vars.len() {
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return Err(format!(
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"Unexpected number of type parameters: expected {} but got {}",
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type_vars.len(),
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types.len()
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));
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}
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let mut subst = HashMap::new();
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for (var, ty) in izip!(type_vars.iter(), types.iter()) {
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let id = if let TypeEnum::TVar { id, .. } = &*unifier.get_ty(*var) {
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*id
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} else {
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unreachable!()
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};
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subst.insert(id, *ty);
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}
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let mut fields = fields
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.iter()
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.map(|(attr, ty)| {
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let ty = unifier.subst(*ty, &subst).unwrap_or(*ty);
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(attr.clone(), ty)
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})
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.collect::<HashMap<_, _>>();
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fields.extend(methods.iter().map(|(attr, ty, _)| {
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let ty = unifier.subst(*ty, &subst).unwrap_or(*ty);
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(attr.clone(), ty)
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}));
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Ok(unifier.add_ty(TypeEnum::TObj {
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obj_id,
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fields: fields.into(),
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params: subst.into(),
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}))
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} else {
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Err("Cannot use function name as type".into())
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}
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}
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} else {
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Err("unsupported type expression".into())
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}
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}
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_ => Err("unsupported type expression".into()),
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}
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}
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impl dyn SymbolResolver {
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// convert type annotation into type
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pub fn parse_type_annotation<T>(
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&self,
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top_level: &TopLevelContext,
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@ -45,114 +164,18 @@ impl dyn SymbolResolver {
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primitives: &PrimitiveStore,
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expr: &Expr<T>,
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) -> Result<Type, String> {
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use rustpython_parser::ast::ExprKind::*;
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match &expr.node {
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Name { id, .. } => match id.as_str() {
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"int32" => Ok(primitives.int32),
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"int64" => Ok(primitives.int64),
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"float" => Ok(primitives.float),
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"bool" => Ok(primitives.bool),
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"None" => Ok(primitives.none),
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x => {
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let obj_id = self.get_identifier_def(x);
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if let Some(obj_id) = obj_id {
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let defs = top_level.definitions.read();
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let def = defs[obj_id.0].read();
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if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*def {
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if !type_vars.is_empty() {
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return Err(format!(
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"Unexpected number of type parameters: expected {} but got 0",
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type_vars.len()
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));
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}
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let fields = RefCell::new(
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chain(
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fields.iter().map(|(k, v)| (k.clone(), *v)),
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methods.iter().map(|(k, v, _)| (k.clone(), *v)),
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)
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.collect(),
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);
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Ok(unifier.add_ty(TypeEnum::TObj {
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obj_id,
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fields,
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params: Default::default(),
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}))
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} else {
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Err("Cannot use function name as type".into())
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}
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} else {
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// it could be a type variable
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let ty = self
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.get_symbol_type(unifier, primitives, x)
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.ok_or_else(|| "Cannot use function name as type".to_owned())?;
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if let TypeEnum::TVar { .. } = &*unifier.get_ty(ty) {
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Ok(ty)
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} else {
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Err(format!("Unknown type annotation {}", x))
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}
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}
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}
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},
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Subscript { value, slice, .. } => {
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if let Name { id, .. } = &value.node {
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if id == "virtual" {
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let ty =
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self.parse_type_annotation(top_level, unifier, primitives, slice)?;
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Ok(unifier.add_ty(TypeEnum::TVirtual { ty }))
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} else {
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let types = if let Tuple { elts, .. } = &slice.node {
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elts.iter()
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.map(|v| {
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self.parse_type_annotation(top_level, unifier, primitives, v)
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})
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.collect::<Result<Vec<_>, _>>()?
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} else {
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vec![self.parse_type_annotation(top_level, unifier, primitives, slice)?]
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};
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let obj_id = self
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.get_identifier_def(id)
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.ok_or_else(|| format!("Unknown type annotation {}", id))?;
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let defs = top_level.definitions.read();
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let def = defs[obj_id.0].read();
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if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*def {
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if types.len() != type_vars.len() {
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return Err(format!(
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"Unexpected number of type parameters: expected {} but got {}",
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type_vars.len(),
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types.len()
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));
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}
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let mut subst = HashMap::new();
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for (var, ty) in izip!(type_vars.iter(), types.iter()) {
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let id = if let TypeEnum::TVar { id, .. } = &*unifier.get_ty(*var) {
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*id
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} else {
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unreachable!()
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};
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subst.insert(id, *ty);
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}
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let mut fields = fields
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.iter()
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.map(|(attr, ty)| {
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let ty = unifier.subst(*ty, &subst).unwrap_or(*ty);
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(attr.clone(), ty)
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})
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.collect::<HashMap<_, _>>();
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fields.extend(methods.iter().map(|(attr, ty, _)| {
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let ty = unifier.subst(*ty, &subst).unwrap_or(*ty);
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(attr.clone(), ty)
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}));
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Ok(unifier.add_ty(TypeEnum::TObj { obj_id, fields: fields.into(), params: subst.into() }))
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} else {
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Err("Cannot use function name as type".into())
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}
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}
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} else {
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Err("unsupported type expression".into())
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}
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}
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_ => Err("unsupported type expression".into()),
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}
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parse_type_annotation(self, top_level, unifier, primitives, expr)
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}
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}
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impl dyn SymbolResolver + Send {
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pub fn parse_type_annotation<T>(
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&self,
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top_level: &TopLevelContext,
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unifier: &mut Unifier,
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primitives: &PrimitiveStore,
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expr: &Expr<T>,
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) -> Result<Type, String> {
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parse_type_annotation(self, top_level, unifier, primitives, expr)
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}
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}
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|
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