forked from M-Labs/nac3
390 lines
15 KiB
Rust
390 lines
15 KiB
Rust
use crate::typecheck::typedef::TypeVarMeta;
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use super::*;
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#[derive(Clone, Debug)]
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pub enum TypeAnnotation {
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PrimitiveKind(Type),
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// we use type vars kind at params to represent self type
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CustomClassKind {
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id: DefinitionId,
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// params can also be type var
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params: Vec<TypeAnnotation>,
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},
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// can only be CustomClassKind
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VirtualKind(Box<TypeAnnotation>),
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TypeVarKind(Type),
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ListKind(Box<TypeAnnotation>),
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TupleKind(Vec<TypeAnnotation>),
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}
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pub fn parse_ast_to_type_annotation_kinds<T>(
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resolver: &Mutex<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) = {
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// write this way because the lock in the if/let construct lives
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// for the whole if let construct
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let id = resolver.lock().get_identifier_def(x);
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id
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} {
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let def = top_level_defs[obj_id.0].read();
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if let TopLevelDef::Class { type_vars, .. } = &*def {
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// also check param number here
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if !type_vars.is_empty() {
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return Err(format!(
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"expect {} type variable parameter but got 0",
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type_vars.len()
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));
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}
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Ok(TypeAnnotation::CustomClassKind { id: obj_id, params: vec![] })
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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) = {
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let ty = resolver.lock().get_symbol_type(unifier, primitives, id);
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ty
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} {
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if let TypeEnum::TVar { .. } = unifier.get_ty(ty).as_ref() {
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Ok(TypeAnnotation::TypeVarKind(ty))
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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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// virtual
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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::CustomClassKind { .. }) {
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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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// list
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ast::ExprKind::Subscript { value, slice, .. }
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if { matches!(&value.node, ast::ExprKind::Name { id, .. } if id == "list") } =>
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{
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let def_ann = 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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Ok(TypeAnnotation::ListKind(def_ann.into()))
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}
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// tuple
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ast::ExprKind::Subscript { value, slice, .. }
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if { matches!(&value.node, ast::ExprKind::Name { id, .. } if id == "tuple") } =>
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{
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if let ast::ExprKind::Tuple { elts, .. } = &slice.node {
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let type_annotations = elts
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.iter()
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.map(|e| {
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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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e,
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)
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})
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.collect::<Result<Vec<_>, _>>()?;
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Ok(TypeAnnotation::TupleKind(type_annotations))
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} else {
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Err("Expect multiple elements for tuple".into())
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}
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}
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// custom class
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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", "list", "tuple"].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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.lock()
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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 { type_vars, .. } = &*def {
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let param_type_infos = {
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let params_ast = if let ast::ExprKind::Tuple { elts, .. } = &slice.node {
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elts.iter().collect_vec()
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} else {
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vec![slice.as_ref()]
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};
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if type_vars.len() != params_ast.len() {
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return Err(format!(
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"expect {} type parameters but got {}",
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type_vars.len(),
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params_ast.len()
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));
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}
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let result = params_ast
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.into_iter()
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.map(|x| {
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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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x,
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)
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})
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.collect::<Result<Vec<_>, _>>()?;
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// make sure the result do not contain any type vars
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let no_type_var = result
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.iter()
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.all(|x| get_type_var_contained_in_type_annotation(x).is_empty());
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if no_type_var {
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result
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} else {
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return Err("application of type vars to generic class \
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is not currently supported"
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.into());
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}
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};
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// allow type var in class generic application list
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Ok(TypeAnnotation::CustomClassKind { id: obj_id, params: param_type_infos })
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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::CustomClassKind { 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).as_ref() {
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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::PrimitiveKind(ty) | 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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TypeAnnotation::ListKind(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::TList { ty }))
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}
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TypeAnnotation::TupleKind(tys) => {
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let tys = tys
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.iter()
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.map(|x| {
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get_type_from_type_annotation_kinds(top_level_defs, unifier, primitives, x)
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})
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.collect::<Result<Vec<_>, _>>()?;
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Ok(unifier.add_ty(TypeEnum::TTuple { ty: tys }))
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}
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}
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}
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/// given an def id, return a type annotation of self \
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/// ```python
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/// class A(Generic[T, V]):
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/// def fun(self):
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/// ```
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/// the type of `self` should be similar to `A[T, V]`, where `T`, `V`
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/// considered to be type variables associated with the class \
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/// \
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/// But note that here we do not make a duplication of `T`, `V`, we direclty
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/// use them as they are in the TopLevelDef::Class since those in the
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/// TopLevelDef::Class.type_vars will be substitute later when seeing applications/instantiations
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/// the Type of their fields and methods will also be subst when application/instantiation \
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/// \
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/// Note this implicit self type is different with seeing `A[T, V]` explicitly outside
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/// the class def ast body, where it is a new instantiation of the generic class `A`,
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/// but equivalent to seeing `A[T, V]` inside the class def body ast, where although we
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/// create copies of `T` and `V`, we will find them out as occured type vars in the analyze_class()
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/// and unify them with the class generic `T`, `V`
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pub fn make_self_type_annotation(
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top_level_defs: &[Arc<RwLock<TopLevelDef>>],
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def_id: DefinitionId,
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) -> Result<TypeAnnotation, String> {
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let obj_def =
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top_level_defs.get(def_id.0).ok_or_else(|| "invalid definition id".to_string())?;
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let obj_def = obj_def.read();
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let obj_def = obj_def.deref();
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if let TopLevelDef::Class { type_vars, .. } = obj_def {
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Ok(TypeAnnotation::CustomClassKind {
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id: def_id,
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params: type_vars.iter().map(|ty| TypeAnnotation::TypeVarKind(*ty)).collect_vec(),
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})
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} else {
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unreachable!("must be top level class def here")
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}
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}
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/// get all the occurences of type vars contained in a type annotation
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/// e.g. `A[int, B[T], V, virtual[C[G]]]` => [T, V, G]
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/// this function will not make a duplicate of type var
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pub fn get_type_var_contained_in_type_annotation(ann: &TypeAnnotation) -> Vec<TypeAnnotation> {
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let mut result: Vec<TypeAnnotation> = Vec::new();
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match ann {
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TypeAnnotation::TypeVarKind(..) => result.push(ann.clone()),
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TypeAnnotation::VirtualKind(ann) => {
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result.extend(get_type_var_contained_in_type_annotation(ann.as_ref()))
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}
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TypeAnnotation::CustomClassKind { params, .. } => {
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for p in params {
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result.extend(get_type_var_contained_in_type_annotation(p));
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}
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}
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_ => {}
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}
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result
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}
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/// check the type compatibility for overload
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pub fn check_overload_type_annotation_compatible(
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this: &TypeAnnotation,
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other: &TypeAnnotation,
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unifier: &mut Unifier,
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) -> bool {
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match (this, other) {
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(TypeAnnotation::PrimitiveKind(a), TypeAnnotation::PrimitiveKind(b)) => a == b,
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(TypeAnnotation::TypeVarKind(a), TypeAnnotation::TypeVarKind(b)) => {
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let a = unifier.get_ty(*a);
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let a = a.deref();
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let b = unifier.get_ty(*b);
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let b = b.deref();
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if let (
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TypeEnum::TVar { id: a, meta: TypeVarMeta::Generic, .. },
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TypeEnum::TVar { id: b, meta: TypeVarMeta::Generic, .. },
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) = (a, b)
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{
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a == b
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} else {
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unreachable!("must be type var")
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}
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}
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(TypeAnnotation::VirtualKind(a), TypeAnnotation::VirtualKind(b))
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| (TypeAnnotation::ListKind(a), TypeAnnotation::ListKind(b)) => {
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check_overload_type_annotation_compatible(a.as_ref(), b.as_ref(), unifier)
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}
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(TypeAnnotation::TupleKind(a), TypeAnnotation::TupleKind(b)) => {
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a.len() == b.len() && {
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a.iter()
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.zip(b)
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.all(|(a, b)| check_overload_type_annotation_compatible(a, b, unifier))
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}
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}
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(
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TypeAnnotation::CustomClassKind { id: a, params: a_p },
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TypeAnnotation::CustomClassKind { id: b, params: b_p },
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) => {
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a.0 == b.0 && {
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a_p.len() == b_p.len() && {
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a_p.iter()
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.zip(b_p)
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.all(|(a, b)| check_overload_type_annotation_compatible(a, b, unifier))
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}
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}
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}
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_ => false,
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}
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}
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