forked from M-Labs/nac3
238 lines
9.9 KiB
Rust
238 lines
9.9 KiB
Rust
use super::*;
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use crate::typecheck::typedef::TypeVarMeta;
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#[derive(Clone)]
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pub enum TypeAnnotation {
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PrimitiveKind(Type),
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ConcretizedCustomClassKind {
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id: DefinitionId,
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// can not be type var, others are all fine
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// TODO: can also be type var?
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params: Vec<TypeAnnotation>,
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},
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// can only be ConcretizedCustomClassKind
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VirtualKind(Box<TypeAnnotation>),
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// the first u32 refers to the var_id of the
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// TVar returned by the symbol resolver,
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// this is used to handle type vars
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// associated with class/functions
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// since when associating we create a copy of type vars
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TypeVarKind(u32, Type),
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SelfTypeKind(DefinitionId),
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}
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pub fn parse_ast_to_type_annotation_kinds<T>(
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resolver: &Box<dyn SymbolResolver + Send + Sync>,
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top_level_defs: &[Arc<RwLock<TopLevelDef>>],
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unifier: &mut Unifier,
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primitives: &PrimitiveStore,
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expr: &ast::Expr<T>,
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) -> Result<TypeAnnotation, String> {
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match &expr.node {
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ast::ExprKind::Name { id, .. } => match id.as_str() {
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"int32" => Ok(TypeAnnotation::PrimitiveKind(primitives.int32)),
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"int64" => Ok(TypeAnnotation::PrimitiveKind(primitives.int64)),
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"float" => Ok(TypeAnnotation::PrimitiveKind(primitives.float)),
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"bool" => Ok(TypeAnnotation::PrimitiveKind(primitives.bool)),
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"None" => Ok(TypeAnnotation::PrimitiveKind(primitives.none)),
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x => {
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if let Some(obj_id) = resolver.get_identifier_def(x) {
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let def = top_level_defs[obj_id.0].read();
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if let TopLevelDef::Class { .. } = &*def {
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Ok(TypeAnnotation::ConcretizedCustomClassKind {
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id: obj_id,
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params: vec![],
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})
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} else {
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Err("function cannot be used as a type".into())
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}
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} else if let Some(ty) = resolver.get_symbol_type(unifier, primitives, id) {
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if let TypeEnum::TVar { id, meta: TypeVarMeta::Generic, range } =
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unifier.get_ty(ty).as_ref()
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{
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// NOTE: always create a new one here
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// and later unify if needed
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// but record the var_id of the original type var returned by symbol resolver
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let range = range.borrow();
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let range = range.as_slice();
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Ok(TypeAnnotation::TypeVarKind(
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*id,
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unifier.get_fresh_var_with_range(range).0,
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))
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} else {
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Err("not a type variable identifier".into())
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}
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} else {
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Err("name cannot be parsed as a type annotation".into())
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}
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}
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},
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// TODO: subscript or call
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ast::ExprKind::Subscript { value, slice, .. }
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if { matches!(&value.node, ast::ExprKind::Name { id, .. } if id == "virtual") } =>
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{
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let def = parse_ast_to_type_annotation_kinds(
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resolver,
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top_level_defs,
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unifier,
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primitives,
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slice.as_ref(),
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)?;
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if !matches!(def, TypeAnnotation::ConcretizedCustomClassKind { .. }) {
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unreachable!("must be concretized custom class kind in the virtual")
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}
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Ok(TypeAnnotation::VirtualKind(def.into()))
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}
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ast::ExprKind::Subscript { value, slice, .. } => {
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if let ast::ExprKind::Name { id, .. } = &value.node {
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if vec!["virtual", "Generic"].contains(&id.as_str()) {
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return Err("keywords cannot be class name".into());
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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(|| "unknown class name".to_string())?;
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let def = top_level_defs[obj_id.0].read();
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if let TopLevelDef::Class { .. } = &*def {
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let param_type_infos = if let ast::ExprKind::Tuple { elts, .. } = &slice.node {
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elts.iter()
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.map(|v| {
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parse_ast_to_type_annotation_kinds(
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resolver,
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top_level_defs,
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unifier,
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primitives,
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v,
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)
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})
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.collect::<Result<Vec<_>, _>>()?
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} else {
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vec![parse_ast_to_type_annotation_kinds(
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resolver,
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top_level_defs,
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unifier,
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primitives,
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slice,
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)?]
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};
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// NOTE: allow type var in class generic application list
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Ok(TypeAnnotation::ConcretizedCustomClassKind {
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id: obj_id,
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params: param_type_infos,
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})
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} else {
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Err("function cannot be used as a type".into())
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}
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} else {
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Err("unsupported expression type for class name".into())
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}
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}
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_ => Err("unsupported expression for type annotation".into()),
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}
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}
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pub fn get_type_from_type_annotation_kinds(
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top_level_defs: &[Arc<RwLock<TopLevelDef>>],
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unifier: &mut Unifier,
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primitives: &PrimitiveStore,
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ann: &TypeAnnotation,
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) -> Result<Type, String> {
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match ann {
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TypeAnnotation::ConcretizedCustomClassKind { id, params } => {
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let class_def = top_level_defs[id.0].read();
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if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*class_def {
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if type_vars.len() != params.len() {
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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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params.len()
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))
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} else {
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let param_ty = params
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.iter()
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.map(|x| {
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get_type_from_type_annotation_kinds(
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top_level_defs,
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unifier,
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primitives,
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x,
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)
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})
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.collect::<Result<Vec<_>, _>>()?;
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let subst = type_vars
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.iter()
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.map(|x| {
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if let TypeEnum::TVar { id, .. } = unifier.get_ty(x.1).as_ref() {
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// this is for the class generic application,
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// we only need the information for the copied type var
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// associated with the class
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*id
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} else {
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unreachable!()
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}
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})
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.zip(param_ty.into_iter())
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.collect::<HashMap<u32, Type>>();
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let mut tobj_fields = methods
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.iter()
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.map(|(name, ty, _)| {
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let subst_ty = unifier.subst(*ty, &subst).unwrap_or(*ty);
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(name.clone(), subst_ty)
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})
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.collect::<HashMap<String, Type>>();
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tobj_fields.extend(fields.iter().map(|(name, ty)| {
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let subst_ty = unifier.subst(*ty, &subst).unwrap_or(*ty);
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(name.clone(), subst_ty)
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}));
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Ok(unifier.add_ty(TypeEnum::TObj {
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obj_id: *id,
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fields: tobj_fields.into(),
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params: subst.into(),
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}))
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}
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} else {
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unreachable!("should be class def here")
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}
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}
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TypeAnnotation::SelfTypeKind(obj_id) => {
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let class_def = top_level_defs[obj_id.0].read();
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if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*class_def {
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let subst = type_vars
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.iter()
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.map(|x| {
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if let TypeEnum::TVar { id, .. } = unifier.get_ty(x.1).as_ref() {
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(*id, x.1)
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} else {
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unreachable!()
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}
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})
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.collect::<HashMap<u32, Type>>();
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let mut tobj_fields = methods
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.iter()
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.map(|(name, ty, _)| (name.clone(), *ty))
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.collect::<HashMap<String, Type>>();
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tobj_fields.extend(fields.clone().into_iter());
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Ok(unifier.add_ty(TypeEnum::TObj {
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obj_id: *obj_id,
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fields: tobj_fields.into(),
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params: subst.into(),
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}))
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} else {
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unreachable!("should be class def here")
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}
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}
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TypeAnnotation::PrimitiveKind(ty) => Ok(*ty),
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TypeAnnotation::TypeVarKind(_, ty) => Ok(*ty),
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TypeAnnotation::VirtualKind(ty) => {
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let ty = get_type_from_type_annotation_kinds(
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top_level_defs,
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unifier,
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primitives,
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ty.as_ref(),
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)?;
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Ok(unifier.add_ty(TypeEnum::TVirtual { ty }))
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}
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}
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}
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