forked from M-Labs/nac3
493 lines
19 KiB
Rust
493 lines
19 KiB
Rust
use super::*;
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#[derive(Clone, Debug)]
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pub enum TypeAnnotation {
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Primitive(Type),
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// we use type vars kind at params to represent self type
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CustomClass {
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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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Virtual(Box<TypeAnnotation>),
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TypeVar(Type),
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List(Box<TypeAnnotation>),
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Tuple(Vec<TypeAnnotation>),
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}
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impl TypeAnnotation {
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pub fn stringify(&self, unifier: &mut Unifier) -> String {
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use TypeAnnotation::*;
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match self {
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Primitive(ty) | TypeVar(ty) => unifier.stringify(*ty),
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CustomClass { id, params } => {
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let class_name = match unifier.top_level {
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Some(ref top) => {
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if let TopLevelDef::Class { name, .. } =
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&*top.definitions.read()[id.0].read()
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{
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(*name).into()
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} else {
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format!("def_{}", id.0)
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}
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}
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None => format!("def_{}", id.0),
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};
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format!(
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"{{class: {}, params: {:?}}}",
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class_name,
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params.iter().map(|p| p.stringify(unifier)).collect_vec()
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)
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}
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Virtual(ty) | List(ty) => ty.stringify(unifier),
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Tuple(types) => {
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format!("({:?})", types.iter().map(|p| p.stringify(unifier)).collect_vec())
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}
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}
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}
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}
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pub fn parse_ast_to_type_annotation_kinds<T>(
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resolver: &(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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// the key stores the type_var of this topleveldef::class, we only need this field here
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locked: HashMap<DefinitionId, Vec<Type>>,
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) -> Result<TypeAnnotation, String> {
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let name_handle = |id: &StrRef,
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unifier: &mut Unifier,
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locked: HashMap<DefinitionId, Vec<Type>>| {
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if id == &"int32".into() {
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Ok(TypeAnnotation::Primitive(primitives.int32))
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} else if id == &"int64".into() {
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Ok(TypeAnnotation::Primitive(primitives.int64))
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} else if id == &"uint32".into() {
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Ok(TypeAnnotation::Primitive(primitives.uint32))
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} else if id == &"uint64".into() {
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Ok(TypeAnnotation::Primitive(primitives.uint64))
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} else if id == &"float".into() {
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Ok(TypeAnnotation::Primitive(primitives.float))
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} else if id == &"bool".into() {
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Ok(TypeAnnotation::Primitive(primitives.bool))
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} else if id == &"None".into() {
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Ok(TypeAnnotation::Primitive(primitives.none))
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} else if id == &"str".into() {
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Ok(TypeAnnotation::Primitive(primitives.str))
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} else if id == &"Exception".into() {
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Ok(TypeAnnotation::CustomClass { id: DefinitionId(7), params: Default::default() })
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} else if let Ok(obj_id) = resolver.get_identifier_def(*id) {
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let type_vars = {
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let def_read = top_level_defs[obj_id.0].try_read();
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if let Some(def_read) = def_read {
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if let TopLevelDef::Class { type_vars, .. } = &*def_read {
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type_vars.clone()
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} else {
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return Err(format!(
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"function cannot be used as a type (at {})",
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expr.location
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));
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}
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} else {
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locked.get(&obj_id).unwrap().clone()
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}
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};
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// 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 (at {})",
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type_vars.len(),
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expr.location,
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));
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}
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Ok(TypeAnnotation::CustomClass { id: obj_id, params: vec![] })
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} else if let Ok(ty) = resolver.get_symbol_type(unifier, top_level_defs, primitives, *id) {
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if let TypeEnum::TVar { .. } = unifier.get_ty(ty).as_ref() {
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let var = unifier.get_fresh_var(Some(*id), Some(expr.location)).0;
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unifier.unify(var, ty).unwrap();
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Ok(TypeAnnotation::TypeVar(ty))
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} else {
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Err(format!("`{}` is not a valid type annotation (at {})", id, expr.location))
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}
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} else {
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Err(format!("`{}` is not a valid type annotation (at {})", id, expr.location))
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}
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};
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let class_name_handle =
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|id: &StrRef,
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slice: &ast::Expr<T>,
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unifier: &mut Unifier,
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mut locked: HashMap<DefinitionId, Vec<Type>>| {
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if vec!["virtual".into(), "Generic".into(), "list".into(), "tuple".into()].contains(id)
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{
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return Err(format!("keywords cannot be class name (at {})", expr.location));
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}
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let obj_id = resolver.get_identifier_def(*id)?;
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let type_vars = {
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let def_read = top_level_defs[obj_id.0].try_read();
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if let Some(def_read) = def_read {
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if let TopLevelDef::Class { type_vars, .. } = &*def_read {
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type_vars.clone()
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} else {
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unreachable!("must be class here")
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}
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} else {
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locked.get(&obj_id).unwrap().clone()
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}
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};
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// we do not check whether the application of type variables are compatible here
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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]
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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 {} (at {})",
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type_vars.len(),
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params_ast.len(),
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params_ast[0].location,
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));
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}
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let result = params_ast
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.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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locked.insert(obj_id, type_vars.clone());
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locked.clone()
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},
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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 =
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result.iter().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(format!(
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"application of type vars to generic class \
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is not currently supported (at {})",
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params_ast[0].location
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));
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}
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};
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Ok(TypeAnnotation::CustomClass { id: obj_id, params: param_type_infos })
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};
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match &expr.node {
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ast::ExprKind::Name { id, .. } => name_handle(id, unifier, locked),
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// virtual
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ast::ExprKind::Subscript { value, slice, .. }
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if {
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matches!(&value.node, ast::ExprKind::Name { id, .. } if id == &"virtual".into())
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} =>
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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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locked,
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)?;
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if !matches!(def, TypeAnnotation::CustomClass { .. }) {
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unreachable!("must be concretized custom class kind in the virtual")
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}
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Ok(TypeAnnotation::Virtual(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 {
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matches!(&value.node, ast::ExprKind::Name { id, .. } if id == &"list".into())
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} =>
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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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locked,
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)?;
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Ok(TypeAnnotation::List(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 {
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matches!(&value.node, ast::ExprKind::Name { id, .. } if id == &"tuple".into())
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} =>
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{
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let tup_elts = {
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if let ast::ExprKind::Tuple { elts, .. } = &slice.node {
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elts.as_slice()
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} else {
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std::slice::from_ref(slice.as_ref())
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}
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};
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let type_annotations = tup_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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locked.clone(),
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)
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})
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.collect::<Result<Vec<_>, _>>()?;
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Ok(TypeAnnotation::Tuple(type_annotations))
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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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class_name_handle(id, slice, unifier, locked)
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} else {
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Err(format!("unsupported expression type for class name (at {})", value.location))
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}
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}
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_ => Err(format!("unsupported expression for type annotation (at {})", expr.location)),
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}
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}
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// no need to have the `locked` parameter, unlike the `parse_ast_to_type_annotation_kinds`, since
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// when calling this function, there should be no topleveldef::class being write, and this function
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// also only read the toplevedefs
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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::CustomClass { id: obj_id, params } => {
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let def_read = top_level_defs[obj_id.0].read();
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let class_def: &TopLevelDef = def_read.deref();
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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 = {
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// check for compatible range
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// TODO: if allow type var to be applied(now this disallowed in the parse_to_type_annotation), need more check
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let mut result: HashMap<u32, Type> = HashMap::new();
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for (tvar, p) in type_vars.iter().zip(param_ty) {
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if let TypeEnum::TVar { id, range, fields: None, name, loc } =
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unifier.get_ty(*tvar).as_ref()
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{
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let ok: bool = {
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// create a temp type var and unify to check compatibility
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p == *tvar || {
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let temp = unifier.get_fresh_var_with_range(
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range.as_slice(),
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*name,
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*loc,
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);
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unifier.unify(temp.0, p).is_ok()
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}
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};
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if ok {
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result.insert(*id, p);
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} else {
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return Err(format!(
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"cannot apply type {} to type variable with id {:?}",
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unifier.internal_stringify(
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p,
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&mut |id| format!("class{}", id),
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&mut |id| format!("tvar{}", id),
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&mut None
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),
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*id
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));
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}
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} else {
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unreachable!("must be generic type var")
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}
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}
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result
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};
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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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// methods are immutable
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(*name, (subst_ty, false))
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})
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.collect::<HashMap<_, _>>();
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tobj_fields.extend(fields.iter().map(|(name, ty, mutability)| {
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let subst_ty = unifier.subst(*ty, &subst).unwrap_or(*ty);
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(*name, (subst_ty, *mutability))
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}));
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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,
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params: subst,
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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::Primitive(ty) | TypeAnnotation::TypeVar(ty) => Ok(*ty),
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TypeAnnotation::Virtual(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::List(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::Tuple(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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pub fn make_self_type_annotation(type_vars: &[Type], object_id: DefinitionId) -> TypeAnnotation {
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TypeAnnotation::CustomClass {
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id: object_id,
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params: type_vars.iter().map(|ty| TypeAnnotation::TypeVar(*ty)).collect_vec(),
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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::TypeVar(..) => result.push(ann.clone()),
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TypeAnnotation::Virtual(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::CustomClass { 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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TypeAnnotation::List(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::Tuple(anns) => {
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for a in anns {
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result.extend(get_type_var_contained_in_type_annotation(a));
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}
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}
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TypeAnnotation::Primitive(..) => {}
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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::Primitive(a), TypeAnnotation::Primitive(b)) => a == b,
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(TypeAnnotation::TypeVar(a), TypeAnnotation::TypeVar(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, fields: None, .. },
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TypeEnum::TVar { id: b, fields: None, .. },
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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::Virtual(a), TypeAnnotation::Virtual(b))
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| (TypeAnnotation::List(a), TypeAnnotation::List(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::Tuple(a), TypeAnnotation::Tuple(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::CustomClass { id: a, params: a_p },
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TypeAnnotation::CustomClass { 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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