use std::borrow::BorrowMut; use std::ops::{Deref, DerefMut}; use std::{collections::HashMap, collections::HashSet, sync::Arc}; use self::top_level_type_annotation_info::*; use super::typecheck::type_inferencer::PrimitiveStore; use super::typecheck::typedef::{SharedUnifier, Type, TypeEnum, Unifier}; use crate::symbol_resolver::SymbolResolver; use crate::typecheck::typedef::{FunSignature, FuncArg}; use itertools::{izip, Itertools}; use parking_lot::{Mutex, RwLock}; use rustpython_parser::ast::{self, Stmt}; #[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy)] pub struct DefinitionId(pub usize); pub mod top_level_type_annotation_info { use super::*; use crate::typecheck::typedef::TypeVarMeta; #[derive(Clone)] pub enum TypeAnnotation { PrimitiveKind(Type), ConcretizedCustomClassKind { id: DefinitionId, // can not be type var, others are all fine // TODO: can also be type var? params: Vec, }, // can only be ConcretizedCustomClassKind VirtualKind(Box), // the first u32 refers to the var_id of the // TVar returned by the symbol resolver, // this is used to handle type vars // associated with class/functions // since when associating we create a copy of type vars TypeVarKind(u32, Type), SelfTypeKind(DefinitionId), } pub fn parse_ast_to_type_annotation_kinds( resolver: &dyn SymbolResolver, top_level_defs: &[Arc>], unifier: &mut Unifier, primitives: &PrimitiveStore, expr: &ast::Expr, ) -> Result { let results = vec![ parse_ast_to_concrete_primitive_kind( resolver, top_level_defs, unifier, primitives, expr, ), parse_ast_to_concretized_custom_class_kind( resolver, top_level_defs, unifier, primitives, expr, ), parse_ast_to_type_variable_kind(resolver, top_level_defs, unifier, primitives, expr), parse_ast_to_virtual_kind(resolver, top_level_defs, unifier, primitives, expr), ]; let results = results.iter().filter(|x| x.is_ok()).collect_vec(); if results.len() == 1 { results[0].clone() } else { Err("cannot parsed the type annotation without ambiguity".into()) } } pub fn get_type_from_type_annotation_kinds( top_level_defs: &[Arc>], unifier: &mut Unifier, primitives: &PrimitiveStore, ann: &TypeAnnotation, ) -> Result { match ann { TypeAnnotation::ConcretizedCustomClassKind { id, params } => { let class_def = top_level_defs[id.0].read(); if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*class_def { if type_vars.len() != params.len() { Err(format!( "unexpected number of type parameters: expected {} but got {}", type_vars.len(), params.len() )) } else { let param_ty = params .iter() .map(|x| { get_type_from_type_annotation_kinds( top_level_defs, unifier, primitives, x, ) }) .collect::, _>>()?; let subst = type_vars .iter() .map(|x| { if let TypeEnum::TVar { id, .. } = unifier.get_ty(x.1).as_ref() { // this is for the class generic application, // we only need the information for the copied type var // associated with the class *id } else { unreachable!() } }) .zip(param_ty.into_iter()) .collect::>(); let mut tobj_fields = methods .iter() .map(|(name, ty, _)| { let subst_ty = unifier.subst(*ty, &subst).unwrap_or(*ty); (name.clone(), subst_ty) }) .collect::>(); tobj_fields.extend(fields.iter().map(|(name, ty)| { let subst_ty = unifier.subst(*ty, &subst).unwrap_or(*ty); (name.clone(), subst_ty) })); Ok(unifier.add_ty(TypeEnum::TObj { obj_id: *id, fields: tobj_fields.into(), params: subst.into(), })) } } else { unreachable!("should be class def here") } } TypeAnnotation::SelfTypeKind(obj_id) => { let class_def = top_level_defs[obj_id.0].read(); if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*class_def { let subst = type_vars .iter() .map(|x| { if let TypeEnum::TVar { id, .. } = unifier.get_ty(x.1).as_ref() { (*id, x.1) } else { unreachable!() } }) .collect::>(); let mut tobj_fields = methods .iter() .map(|(name, ty, _)| (name.clone(), *ty)) .collect::>(); tobj_fields.extend(fields.clone().into_iter()); Ok(unifier.add_ty(TypeEnum::TObj { obj_id: *obj_id, fields: tobj_fields.into(), params: subst.into(), })) } else { unreachable!("should be class def here") } } TypeAnnotation::PrimitiveKind(ty) => Ok(*ty), TypeAnnotation::TypeVarKind(_, ty) => Ok(*ty), TypeAnnotation::VirtualKind(ty) => { let ty = get_type_from_type_annotation_kinds( top_level_defs, unifier, primitives, ty.as_ref(), )?; Ok(unifier.add_ty(TypeEnum::TVirtual { ty })) } } } fn parse_ast_to_concrete_primitive_kind( _resolver: &dyn SymbolResolver, _top_level_defs: &[Arc>], _unifier: &mut Unifier, primitives: &PrimitiveStore, expr: &ast::Expr, ) -> Result { match &expr.node { ast::ExprKind::Name { id, .. } => match id.as_str() { "int32" => Ok(TypeAnnotation::PrimitiveKind(primitives.int32)), "int64" => Ok(TypeAnnotation::PrimitiveKind(primitives.int64)), "float" => Ok(TypeAnnotation::PrimitiveKind(primitives.float)), "bool" => Ok(TypeAnnotation::PrimitiveKind(primitives.bool)), "None" => Ok(TypeAnnotation::PrimitiveKind(primitives.none)), _ => Err("not primitive".into()), }, _ => Err("not primitive".into()), } } pub fn parse_ast_to_concretized_custom_class_kind( resolver: &dyn SymbolResolver, top_level_defs: &[Arc>], unifier: &mut Unifier, primitives: &PrimitiveStore, expr: &ast::Expr, ) -> Result { match &expr.node { ast::ExprKind::Name { id, .. } => match id.as_str() { "int32" | "int64" | "float" | "bool" | "None" => { Err("expect custom class instead of primitives here".into()) } x => { let obj_id = resolver .get_identifier_def(x) .ok_or_else(|| "unknown class name".to_string())?; let def = top_level_defs[obj_id.0].read(); if let TopLevelDef::Class { .. } = &*def { Ok(TypeAnnotation::ConcretizedCustomClassKind { id: obj_id, params: vec![], }) } else { Err("function cannot be used as a type".into()) } } }, ast::ExprKind::Subscript { value, slice, .. } => { if let ast::ExprKind::Name { id, .. } = &value.node { if vec!["virtual", "Generic"].contains(&id.as_str()) { return Err("keywords cannot be class name".into()); } let obj_id = resolver .get_identifier_def(id) .ok_or_else(|| "unknown class name".to_string())?; let def = top_level_defs[obj_id.0].read(); if let TopLevelDef::Class { .. } = &*def { let param_type_infos = if let ast::ExprKind::Tuple { elts, .. } = &slice.node { elts.iter() .map(|v| { parse_ast_to_type_annotation_kinds( resolver, top_level_defs, unifier, primitives, v, ) }) .collect::, _>>()? } else { vec![parse_ast_to_type_annotation_kinds( resolver, top_level_defs, unifier, primitives, slice, )?] }; // TODO: allow type var in class generic application list // if param_type_infos // .iter() // .any(|x| matches!(x, TypeAnnotation::TypeVarKind(..))) // { // return Err( // "cannot apply type variable to class generic parameters".into() // ); // } Ok(TypeAnnotation::ConcretizedCustomClassKind { id: obj_id, params: param_type_infos, }) } else { Err("function cannot be used as a type".into()) } } else { Err("unsupported expression type for class name".into()) } } _ => Err("unsupported expression type for concretized class".into()), } } pub fn parse_ast_to_virtual_kind( resolver: &dyn SymbolResolver, top_level_defs: &[Arc>], unifier: &mut Unifier, primitives: &PrimitiveStore, expr: &ast::Expr, ) -> Result { match &expr.node { ast::ExprKind::Subscript { value, slice, .. } if { matches!(&value.node, ast::ExprKind::Name { id, .. } if id == "virtual") } => { let def = parse_ast_to_concretized_custom_class_kind( resolver, top_level_defs, unifier, primitives, slice.as_ref(), )?; if !matches!(def, TypeAnnotation::ConcretizedCustomClassKind { .. }) { unreachable!("must be concretized custom class kind in the virtual") } Ok(TypeAnnotation::VirtualKind(def.into())) } _ => Err("virtual type annotation must be like `virtual[ .. ]`".into()), } } pub fn parse_ast_to_type_variable_kind( resolver: &dyn SymbolResolver, _top_level_defs: &[Arc>], unifier: &mut Unifier, primitives: &PrimitiveStore, expr: &ast::Expr, ) -> Result { if let ast::ExprKind::Name { id, .. } = &expr.node { let ty = resolver .get_symbol_type(unifier, primitives, id) .ok_or_else(|| "unknown type variable name".to_string())?; if let TypeEnum::TVar { id, meta: TypeVarMeta::Generic, range } = unifier.get_ty(ty).as_ref() { // NOTE: always create a new one here // and later unify if needed // but record the var_id of the original type var returned by symbol resolver let range = range.borrow(); let range = range.as_slice(); Ok(TypeAnnotation::TypeVarKind(*id, unifier.get_fresh_var_with_range(range).0)) } else { Err("not a type variable identifier".into()) } } else { Err("unsupported expression for type variable".into()) } } } pub enum TopLevelDef { Class { // name for error messages and symbols name: String, // object ID used for TypeEnum object_id: DefinitionId, // type variables bounded to the class. // the first field in the tuple is the var_id of the // original typevar defined in the top level and returned // by the symbol resolver type_vars: Vec<(u32, Type)>, // class fields fields: Vec<(String, Type)>, // class methods, pointing to the corresponding function definition. methods: Vec<(String, Type, DefinitionId)>, // ancestor classes, including itself. ancestors: Vec, // symbol resolver of the module defined the class, none if it is built-in type resolver: Option>>, }, Function { // prefix for symbol, should be unique globally, and not ending with numbers name: String, // function signature. signature: Type, /// Function instance to symbol mapping /// Key: string representation of type variable values, sorted by variable ID in ascending /// order, including type variables associated with the class. /// Value: function symbol name. instance_to_symbol: HashMap, /// Function instances to annotated AST mapping /// Key: string representation of type variable values, sorted by variable ID in ascending /// order, including type variables associated with the class. Excluding rigid type /// variables. /// Value: AST annotated with types together with a unification table index. Could contain /// rigid type variables that would be substituted when the function is instantiated. instance_to_stmt: HashMap>, usize)>, // symbol resolver of the module defined the class resolver: Option>>, }, Initializer { class_id: DefinitionId, }, } pub struct TopLevelContext { pub definitions: Arc>>>>, pub unifiers: Arc>>, } pub struct TopLevelComposer { // list of top level definitions, same as top level context pub definition_ast_list: Vec<(Arc>, Option>)>, // start as a primitive unifier, will add more top_level defs inside pub unifier: Unifier, // primitive store pub primitives_ty: PrimitiveStore, // keyword list to prevent same custom def class name pub keyword_list: Vec, } impl TopLevelComposer { pub fn make_top_level_context(self) -> TopLevelContext { TopLevelContext { definitions: RwLock::new( self.definition_ast_list.into_iter().map(|(x, ..)| x).collect::>(), ) .into(), // FIXME: all the big unifier or? unifiers: Default::default(), } } pub fn make_primitives() -> (PrimitiveStore, Unifier) { let mut unifier = Unifier::new(); let int32 = unifier.add_ty(TypeEnum::TObj { obj_id: DefinitionId(0), fields: HashMap::new().into(), params: HashMap::new().into(), }); let int64 = unifier.add_ty(TypeEnum::TObj { obj_id: DefinitionId(1), fields: HashMap::new().into(), params: HashMap::new().into(), }); let float = unifier.add_ty(TypeEnum::TObj { obj_id: DefinitionId(2), fields: HashMap::new().into(), params: HashMap::new().into(), }); let bool = unifier.add_ty(TypeEnum::TObj { obj_id: DefinitionId(3), fields: HashMap::new().into(), params: HashMap::new().into(), }); let none = unifier.add_ty(TypeEnum::TObj { obj_id: DefinitionId(4), fields: HashMap::new().into(), params: HashMap::new().into(), }); let primitives = PrimitiveStore { int32, int64, float, bool, none }; crate::typecheck::magic_methods::set_primitives_magic_methods(&primitives, &mut unifier); (primitives, unifier) } /// return a composer and things to make a "primitive" symbol resolver, so that the symbol /// resolver can later figure out primitive type definitions when passed a primitive type name // TODO: add list and tuples? pub fn new() -> (Vec<(String, DefinitionId, Type)>, Self) { let primitives = Self::make_primitives(); let top_level_def_list = vec![ Arc::new(RwLock::new(Self::make_top_level_class_def(0, None, "int32"))), Arc::new(RwLock::new(Self::make_top_level_class_def(1, None, "int64"))), Arc::new(RwLock::new(Self::make_top_level_class_def(2, None, "float"))), Arc::new(RwLock::new(Self::make_top_level_class_def(3, None, "bool"))), Arc::new(RwLock::new(Self::make_top_level_class_def(4, None, "none"))), ]; let ast_list: Vec>> = vec![None, None, None, None, None]; let composer = TopLevelComposer { definition_ast_list: izip!(top_level_def_list, ast_list).collect_vec(), primitives_ty: primitives.0, unifier: primitives.1, // class_method_to_def_id: Default::default(), // to_be_analyzed_class: Default::default(), keyword_list: vec![ "Generic".into(), "virtual".into(), "list".into(), "tuple".into(), "int32".into(), "int64".into(), "float".into(), "bool".into(), "none".into(), "None".into(), ], }; ( vec![ ("int32".into(), DefinitionId(0), composer.primitives_ty.int32), ("int64".into(), DefinitionId(1), composer.primitives_ty.int64), ("float".into(), DefinitionId(2), composer.primitives_ty.float), ("bool".into(), DefinitionId(3), composer.primitives_ty.bool), ("none".into(), DefinitionId(4), composer.primitives_ty.none), ], composer, ) } /// already include the definition_id of itself inside the ancestors vector /// when first regitering, the type_vars, fields, methods, ancestors are invalid pub fn make_top_level_class_def( index: usize, resolver: Option>>, name: &str, ) -> TopLevelDef { TopLevelDef::Class { name: name.to_string(), object_id: DefinitionId(index), type_vars: Default::default(), fields: Default::default(), methods: Default::default(), ancestors: vec![TypeAnnotation::SelfTypeKind(DefinitionId(index))], resolver, } } /// when first registering, the type is a invalid value pub fn make_top_level_function_def( name: String, ty: Type, resolver: Option>>, ) -> TopLevelDef { TopLevelDef::Function { name, signature: ty, instance_to_symbol: Default::default(), instance_to_stmt: Default::default(), resolver, } } fn make_class_method_name(mut class_name: String, method_name: &str) -> String { class_name.push_str(method_name); class_name } fn extract_def_list(&self) -> Vec>> { self.definition_ast_list.iter().map(|(def, ..)| def.clone()).collect_vec() } /// step 0, register, just remeber the names of top level classes/function /// and check duplicate class/method/function definition pub fn register_top_level( &mut self, ast: ast::Stmt<()>, resolver: Option>>, ) -> Result<(String, DefinitionId), String> { let mut defined_class_name: HashSet = HashSet::new(); let mut defined_class_method_name: HashSet = HashSet::new(); let mut defined_function_name: HashSet = HashSet::new(); match &ast.node { ast::StmtKind::ClassDef { name, body, .. } => { if self.keyword_list.contains(name) { return Err("cannot use keyword as a class name".into()); } if !defined_class_name.insert(name.clone()) { return Err("duplicate definition of class".into()); } let class_name = name.to_string(); let class_def_id = self.definition_ast_list.len(); // since later when registering class method, ast will still be used, // here push None temporarly, later will move the ast inside let mut class_def_ast = ( Arc::new(RwLock::new(Self::make_top_level_class_def( class_def_id, resolver.clone(), name.as_str(), ))), None, ); // parse class def body and register class methods into the def list. // module's symbol resolver would not know the name of the class methods, // thus cannot return their definition_id let mut class_method_name_def_ids: Vec<( // the simple method name without class name String, // in this top level def, method name is prefixed with the class name Arc>, DefinitionId, Type, )> = Vec::new(); let mut class_method_index_offset = 0; for b in body { if let ast::StmtKind::FunctionDef { name: method_name, .. } = &b.node { let global_class_method_name = Self::make_class_method_name(class_name.clone(), method_name); if !defined_class_method_name.insert(global_class_method_name.clone()) { return Err("duplicate class method definition".into()); } let method_def_id = self.definition_ast_list.len() + { class_method_index_offset += 1; class_method_index_offset }; // dummy method define here let dummy_method_type = self.unifier.get_fresh_var(); class_method_name_def_ids.push(( method_name.clone(), RwLock::new(Self::make_top_level_function_def( global_class_method_name, // later unify with parsed type dummy_method_type.0, resolver.clone(), )) .into(), DefinitionId(method_def_id), dummy_method_type.0, )); } else { // do nothing continue; } } // move the ast to the entry of the class in the ast_list class_def_ast.1 = Some(ast); // get the methods into the class_def for (name, _, id, ty) in &class_method_name_def_ids { let mut class_def = class_def_ast.0.write(); if let TopLevelDef::Class { methods, .. } = class_def.deref_mut() { methods.push((name.clone(), *ty, *id)) } else { unreachable!() } } // now class_def_ast and class_method_def_ast_ids are ok, put them into actual def list in correct order self.definition_ast_list.push(class_def_ast); for (_, def, ..) in class_method_name_def_ids { self.definition_ast_list.push((def, None)); } // put the constructor into the def_list self.definition_ast_list.push(( RwLock::new(TopLevelDef::Initializer { class_id: DefinitionId(class_def_id) }) .into(), None, )); Ok((class_name, DefinitionId(class_def_id))) } ast::StmtKind::FunctionDef { name, .. } => { let fun_name = name.to_string(); if !defined_function_name.insert(name.to_string()) { return Err("duplicate top level function define".into()); } // add to the definition list self.definition_ast_list.push(( RwLock::new(Self::make_top_level_function_def( name.into(), // unify with correct type later self.unifier.get_fresh_var().0, resolver, )) .into(), Some(ast), )); // return Ok((fun_name, DefinitionId(self.definition_ast_list.len() - 1))) } _ => Err("only registrations of top level classes/functions are supprted".into()), } } /// step 1, analyze the type vars associated with top level class fn analyze_top_level_class_type_var(&mut self) -> Result<(), String> { let def_list = &self.definition_ast_list; let temp_def_list = self.extract_def_list(); let unifier = self.unifier.borrow_mut(); let primitives_store = &self.primitives_ty; for (class_def, class_ast) in def_list { // only deal with class def here let mut class_def = class_def.write(); let (class_bases_ast, class_def_type_vars, class_resolver) = { if let TopLevelDef::Class { type_vars, resolver, .. } = class_def.deref_mut() { if let Some(ast::Located { node: ast::StmtKind::ClassDef { bases, .. }, .. }) = class_ast { (bases, type_vars, resolver) } else { unreachable!("must be both class") } } else { continue; } }; let class_resolver = class_resolver.as_ref().unwrap().lock(); let class_resolver = class_resolver.deref(); let mut is_generic = false; for b in class_bases_ast { match &b.node { // analyze typevars bounded to the class, // only support things like `class A(Generic[T, V])`, // things like `class A(Generic[T, V, ImportedModule.T])` is not supported // i.e. only simple names are allowed in the subscript // should update the TopLevelDef::Class.typevars and the TypeEnum::TObj.params ast::ExprKind::Subscript { value, slice, .. } if { matches!(&value.node, ast::ExprKind::Name { id, .. } if id == "Generic") } => { if !is_generic { is_generic = true; } else { return Err("Only single Generic[...] can be in bases".into()); } let mut type_var_list: Vec<&ast::Expr<()>> = vec![]; // if `class A(Generic[T, V, G])` if let ast::ExprKind::Tuple { elts, .. } = &slice.node { type_var_list.extend(elts.iter()); // `class A(Generic[T])` } else { type_var_list.push(slice.deref()); } // parse the type vars let type_vars = type_var_list .into_iter() .map(|e| { class_resolver.parse_type_annotation( &temp_def_list, unifier, primitives_store, e, ) }) .collect::, _>>()?; // check if all are unique type vars let mut occured_type_var_id: HashSet = HashSet::new(); let all_unique_type_var = type_vars.iter().all(|x| { let ty = unifier.get_ty(*x); if let TypeEnum::TVar { id, .. } = ty.as_ref() { occured_type_var_id.insert(*id) } else { false } }); if !all_unique_type_var { return Err("expect unique type variables".into()); } // NOTE: create a copy of all type vars for the type vars associated with class let type_vars = type_vars .into_iter() .map(|x| { let range = unifier.get_ty(x); if let TypeEnum::TVar { id, range, .. } = range.as_ref() { let range = &*range.borrow(); let range = range.as_slice(); (*id, unifier.get_fresh_var_with_range(range).0) } else { unreachable!("must be type var here after previous check"); } }) .collect_vec(); // add to TopLevelDef class_def_type_vars.extend(type_vars); } // if others, do nothing in this function _ => continue, } } } Ok(()) } /// step 2, base classes. fn analyze_top_level_class_bases(&mut self) -> Result<(), String> { let temp_def_list = self.extract_def_list(); for (class_def, class_ast) in self.definition_ast_list.iter_mut() { let mut class_def = class_def.write(); let (class_bases, class_ancestors, class_resolver) = { if let TopLevelDef::Class { ancestors, resolver, .. } = class_def.deref_mut() { if let Some(ast::Located { node: ast::StmtKind::ClassDef { bases, .. }, .. }) = class_ast { (bases, ancestors, resolver) } else { unreachable!("must be both class") } } else { continue; } }; let class_resolver = class_resolver.as_ref().unwrap().lock(); let class_resolver = class_resolver.deref(); let mut has_base = false; for b in class_bases { // type vars have already been handled, so skip on `Generic[...]` if matches!( &b.node, ast::ExprKind::Subscript { value, .. } if matches!( &value.node, ast::ExprKind::Name { id, .. } if id == "Generic" ) ) { continue; } if has_base { return Err("a class def can only have at most one base class \ declaration and one generic declaration" .into()); } has_base = true; let base_ty = parse_ast_to_type_annotation_kinds( class_resolver, &temp_def_list, self.unifier.borrow_mut(), &self.primitives_ty, b, )?; if let TypeAnnotation::ConcretizedCustomClassKind { .. } = &base_ty { // TODO: check to prevent cyclic base class class_ancestors.push(base_ty); } else { return Err( "class base declaration can only be concretized custom class".into() ); } } } Ok(()) } /// step 3, class fields and methods fn analyze_top_level_class_fields_methods(&mut self) -> Result<(), String> { let temp_def_list = self.extract_def_list(); let unifier = self.unifier.borrow_mut(); let primitives = &self.primitives_ty; let def_ast_list = &self.definition_ast_list; let mut type_var_to_concrete_def: HashMap = HashMap::new(); for (class_def, class_ast) in def_ast_list { Self::analyze_single_class( class_def.clone(), &class_ast.as_ref().unwrap().node, &temp_def_list, unifier, primitives, &mut type_var_to_concrete_def, )? } // base class methods add and check // TODO: // unification of previously assigned typevar for (ty, def) in type_var_to_concrete_def { let target_ty = get_type_from_type_annotation_kinds(&temp_def_list, unifier, primitives, &def)?; unifier.unify(ty, target_ty)?; } Ok(()) } /// step 4, after class methods are done fn analyze_top_level_function(&mut self) -> Result<(), String> { let def_list = &self.definition_ast_list; let temp_def_list = self.extract_def_list(); let unifier = self.unifier.borrow_mut(); let primitives_store = &self.primitives_ty; for (function_def, function_ast) in def_list { let function_def = function_def.read(); let function_def = function_def.deref(); let function_ast = if let Some(function_ast) = function_ast { function_ast } else { continue; }; if let TopLevelDef::Function { signature: dummy_ty, resolver, .. } = function_def { if let ast::StmtKind::FunctionDef { args, returns, .. } = &function_ast.node { let resolver = resolver.as_ref(); let resolver = resolver.unwrap(); let resolver = resolver.deref().lock(); let function_resolver = resolver.deref(); // occured type vars should not be handled separately // TODO: type vars occured as applications of generic classes is not handled let mut occured_type_var: HashMap = HashMap::new(); let mut function_var_map: HashMap = HashMap::new(); let arg_types = { // make sure no duplicate parameter let mut defined_paramter_name: HashSet = HashSet::new(); let have_unique_fuction_parameter_name = args .args .iter() .all(|x| defined_paramter_name.insert(x.node.arg.clone())); if !have_unique_fuction_parameter_name { return Err("top level function have duplicate parameter name".into()); } args.args .iter() .map(|x| -> Result { let annotation = x .node .annotation .as_ref() .ok_or_else(|| { "function parameter type annotation needed".to_string() })? .as_ref(); let mut ty = function_resolver.parse_type_annotation( temp_def_list.as_slice(), unifier, primitives_store, annotation, )?; if let TypeEnum::TVar { id, range, .. } = unifier.get_ty(ty).as_ref() { if let Some(occured_ty) = occured_type_var.get(id) { // if already occured ty = *occured_ty; } else { // if not, create a duplicate let range = range.borrow(); let range = range.as_slice(); let ty_copy = unifier.get_fresh_var_with_range(range); ty = ty_copy.0; occured_type_var.insert(*id, ty); function_var_map.insert(ty_copy.1, ty_copy.0); } } Ok(FuncArg { name: x.node.arg.clone(), ty, // TODO: function type var default_value: Default::default(), }) }) .collect::, _>>()? }; let return_ty = { let return_annotation = returns .as_ref() .ok_or_else(|| "function return type needed".to_string())? .as_ref(); function_resolver.parse_type_annotation( temp_def_list.as_slice(), unifier, primitives_store, return_annotation, )? }; let function_ty = unifier.add_ty(TypeEnum::TFunc( FunSignature { args: arg_types, ret: return_ty, vars: function_var_map } .into(), )); unifier.unify(*dummy_ty, function_ty)?; } else { unreachable!("must be both function"); } } else { continue; } } Ok(()) } /// step 5, field instantiation? fn analyze_top_level_field_instantiation(&mut self) -> Result<(), String> { // TODO: unimplemented!() } fn analyze_single_class( class_def: Arc>, class_ast: &ast::StmtKind<()>, temp_def_list: &[Arc>], unifier: &mut Unifier, primitives: &PrimitiveStore, type_var_to_concrete_def: &mut HashMap, ) -> Result<(), String> { let mut class_def = class_def.write(); let ( class_id, _class_name, _class_bases_ast, class_body_ast, _class_ancestor_def, class_fields_def, class_methods_def, class_type_vars_def, class_resolver, ) = if let TopLevelDef::Class { object_id, ancestors, fields, methods, resolver, type_vars, .. } = class_def.deref_mut() { if let ast::StmtKind::ClassDef { name, bases, body, .. } = &class_ast { ( object_id, name.clone(), bases, body, ancestors, fields, methods, type_vars, resolver, ) } else { unreachable!("here must be class def ast"); } } else { unreachable!("here must be class def ast"); }; let class_resolver = class_resolver.as_ref().unwrap(); let mut class_resolver = class_resolver.lock(); let class_resolver = class_resolver.deref_mut(); for b in class_body_ast { if let ast::StmtKind::FunctionDef { args, returns, name, body, .. } = &b.node { let (method_dummy_ty, ..) = Self::get_class_method_def_info(class_methods_def, name)?; // handle var map, to create a new copy of type var // while tracking the type var associated with class // TODO: type vars occured as applications of generic classes is not handled let mut method_var_map: HashMap = HashMap::new(); let arg_type: Vec = { // check method parameters cannot have same name let mut defined_paramter_name: HashSet = HashSet::new(); let have_unique_fuction_parameter_name = args.args.iter().all(|x| defined_paramter_name.insert(x.node.arg.clone())); if !have_unique_fuction_parameter_name { return Err("class method have duplicate parameter name".into()); } let mut result = Vec::new(); for x in &args.args { let name = x.node.arg.clone(); if name != "self" { let type_ann = { let annotation_expr = x .node .annotation .as_ref() .ok_or_else(|| "type annotation needed".to_string())? .as_ref(); parse_ast_to_type_annotation_kinds( class_resolver, temp_def_list, unifier, primitives, annotation_expr, )? }; // handle to differentiate type vars that are // asscosiated with the class and that are not // TODO: type vars occured as applications of generic classes is not handled if let TypeAnnotation::TypeVarKind(id, ty) = &type_ann { let associated = class_type_vars_def .iter() .filter(|(class_type_var_id, _)| *class_type_var_id == *id) .collect_vec(); match associated.len() { // 0, do nothing, this is not a type var // associated with the method's class // TODO: but this type var can occur multiple times in this // method's param list, still need to keep track of type vars // associated with this function 0 => {} // is type var associated with class, do the unification here 1 => { unifier.unify(*ty, associated[0].1)?; } _ => { unreachable!("should not be duplicate type var"); } } // just insert the id and ty of self // since the function is not instantiated yet if let TypeEnum::TVar { id, .. } = unifier.get_ty(*ty).as_ref() { method_var_map.insert(*id, *ty); } else { unreachable!("must be type var") } } let dummy_func_arg = FuncArg { name, ty: unifier.get_fresh_var().0, // TODO: symbol default value? default_value: None, }; // push the dummy type and the type annotation // into the list for later unification type_var_to_concrete_def.insert(dummy_func_arg.ty, type_ann.clone()); result.push(dummy_func_arg) } else { // if the parameter name is self // python does not seem to enforce the name // representing the self class object to be // `self`, but we do it here let dummy_func_arg = FuncArg { name: "self".into(), ty: unifier.get_fresh_var().0, default_value: None, }; type_var_to_concrete_def .insert(dummy_func_arg.ty, TypeAnnotation::SelfTypeKind(*class_id)); result.push(dummy_func_arg); } } result }; let ret_type = { if name != "__init__" { let result = returns .as_ref() .ok_or_else(|| "method return type annotation needed".to_string())? .as_ref(); let annotation = parse_ast_to_type_annotation_kinds( class_resolver, temp_def_list, unifier, primitives, result, )?; let dummy_return_type = unifier.get_fresh_var().0; type_var_to_concrete_def.insert(dummy_return_type, annotation.clone()); dummy_return_type } else { // if is the "__init__" function, the return type is self let dummy_return_type = unifier.get_fresh_var().0; type_var_to_concrete_def .insert(dummy_return_type, TypeAnnotation::SelfTypeKind(*class_id)); dummy_return_type } }; let method_type = unifier.add_ty(TypeEnum::TFunc( FunSignature { args: arg_type, ret: ret_type, vars: method_var_map }.into(), )); // unify now since function type is not in type annotation define // which is fine since type within method_type will be subst later unifier.unify(method_dummy_ty, method_type)?; // class fields if name == "__init__" { for b in body { let mut defined_fields: HashSet = HashSet::new(); // TODO: check the type of value, field instantiation check if let ast::StmtKind::AnnAssign { annotation, target, value: _, .. } = &b.node { if let ast::ExprKind::Attribute { value, attr, .. } = &target.node { if matches!(&value.node, ast::ExprKind::Name { id, .. } if id == "self") { if defined_fields.insert(attr.to_string()) { let dummy_field_type = unifier.get_fresh_var().0; class_fields_def.push((attr.to_string(), dummy_field_type)); let annotation = parse_ast_to_type_annotation_kinds( class_resolver, &temp_def_list, unifier, primitives, annotation.as_ref(), )?; type_var_to_concrete_def .insert(dummy_field_type, annotation); } else { return Err("same class fields defined twice".into()); } } } } } } } else { continue; } } Ok(()) } fn get_class_method_def_info( class_methods_def: &[(String, Type, DefinitionId)], method_name: &str, ) -> Result<(Type, DefinitionId), String> { for (name, ty, def_id) in class_methods_def { if name == method_name { return Ok((*ty, *def_id)); } } Err(format!("no method {} in the current class", method_name)) } }