nac3/nac3core/src/toplevel/mod.rs

1002 lines
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Rust
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use std::{
borrow::BorrowMut,
collections::{HashMap, HashSet},
ops::{Deref, DerefMut},
sync::Arc,
};
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use super::typecheck::type_inferencer::PrimitiveStore;
use super::typecheck::typedef::{FunSignature, FuncArg, SharedUnifier, Type, TypeEnum, Unifier};
use crate::{
symbol_resolver::SymbolResolver,
typecheck::{type_inferencer::CodeLocation, typedef::CallId},
};
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use itertools::{izip, Itertools};
use parking_lot::RwLock;
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use rustpython_parser::ast::{self, Stmt};
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#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
pub struct DefinitionId(pub usize);
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mod type_annotation;
use type_annotation::*;
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mod helper;
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pub struct FunInstance {
pub body: Vec<Stmt<Option<Type>>>,
pub calls: HashMap<CodeLocation, CallId>,
pub subst: HashMap<u32, Type>,
pub unifier_id: usize,
}
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pub enum TopLevelDef {
Class {
// name for error messages and symbols
name: String,
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// object ID used for TypeEnum
object_id: DefinitionId,
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/// 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)>,
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// class fields
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fields: Vec<(String, Type)>,
// class methods, pointing to the corresponding function definition.
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methods: Vec<(String, Type, DefinitionId)>,
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// ancestor classes, including itself.
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ancestors: Vec<TypeAnnotation>,
// symbol resolver of the module defined the class, none if it is built-in type
resolver: Option<Arc<Box<dyn SymbolResolver + Send + Sync>>>,
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},
Function {
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// prefix for symbol, should be unique globally, and not ending with numbers
name: String,
// function signature.
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signature: Type,
// instantiated type variable IDs
var_id: Vec<u32>,
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/// 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<String, String>,
/// 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.
/// rigid type variables that would be substituted when the function is instantiated.
instance_to_stmt: HashMap<String, FunInstance>,
// symbol resolver of the module defined the class
resolver: Option<Arc<Box<dyn SymbolResolver + Send + Sync>>>,
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},
Initializer {
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class_id: DefinitionId,
},
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}
pub struct TopLevelContext {
pub definitions: Arc<RwLock<Vec<Arc<RwLock<TopLevelDef>>>>>,
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pub unifiers: Arc<RwLock<Vec<(SharedUnifier, PrimitiveStore)>>>,
}
pub struct TopLevelComposer {
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// list of top level definitions, same as top level context
pub definition_ast_list: Vec<(Arc<RwLock<TopLevelDef>>, Option<ast::Stmt<()>>)>,
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// start as a primitive unifier, will add more top_level defs inside
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pub unifier: Unifier,
// primitive store
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pub primitives_ty: PrimitiveStore,
// keyword list to prevent same custom def class name
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pub keyword_list: Vec<String>,
}
impl Default for TopLevelComposer {
fn default() -> Self {
Self::new()
}
}
impl TopLevelComposer {
/// return a composer and things to make a "primitive" symbol resolver, so that the symbol
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/// resolver can later figure out primitive type definitions when passed a primitive type name
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// TODO: add list and tuples?
pub fn new() -> Self {
let primitives = Self::make_primitives();
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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"))),
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];
let ast_list: Vec<Option<ast::Stmt<()>>> = vec![None, None, None, None, None];
TopLevelComposer {
definition_ast_list: izip!(top_level_def_list, ast_list).collect_vec(),
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primitives_ty: primitives.0,
unifier: primitives.1,
// class_method_to_def_id: Default::default(),
// to_be_analyzed_class: Default::default(),
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keyword_list: vec![
"Generic".into(),
"virtual".into(),
"list".into(),
"tuple".into(),
"int32".into(),
"int64".into(),
"float".into(),
"bool".into(),
"none".into(),
"None".into(),
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],
}
}
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pub fn make_top_level_context(self) -> TopLevelContext {
TopLevelContext {
definitions: RwLock::new(
self.definition_ast_list.into_iter().map(|(x, ..)| x).collect::<Vec<_>>(),
)
.into(),
// FIXME: all the big unifier or?
unifiers: Default::default(),
}
}
fn extract_def_list(&self) -> Vec<Arc<RwLock<TopLevelDef>>> {
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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
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pub fn register_top_level(
&mut self,
ast: ast::Stmt<()>,
resolver: Option<Arc<Box<dyn SymbolResolver + Send + Sync>>>,
) -> Result<(String, DefinitionId), String> {
let mut defined_class_name: HashSet<String> = HashSet::new();
let mut defined_class_method_name: HashSet<String> = HashSet::new();
let mut defined_function_name: HashSet<String> = HashSet::new();
match &ast.node {
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ast::StmtKind::ClassDef { name, body, .. } => {
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if self.keyword_list.contains(name) {
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return Err("cannot use keyword as a class name".into());
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}
if !defined_class_name.insert(name.clone()) {
return Err("duplicate definition of class".into());
}
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let class_name = name.to_string();
let class_def_id = self.definition_ast_list.len();
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// 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 = (
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Arc::new(RwLock::new(Self::make_top_level_class_def(
class_def_id,
resolver.clone(),
name.as_str(),
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))),
None,
);
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// parse class def body and register class methods into the def list.
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// module's symbol resolver would not know the name of the class methods,
// thus cannot return their definition_id
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let mut class_method_name_def_ids: Vec<(
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// the simple method name without class name
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String,
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// in this top level def, method name is prefixed with the class name
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Arc<RwLock<TopLevelDef>>,
DefinitionId,
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Type,
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)> = Vec::new();
// we do not push anything to the def list, so we keep track of the index
// and then push in the correct order after the for loop
let mut class_method_index_offset = 0;
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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() + {
// plus 1 here since we already have the class def
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(),
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))
.into(),
DefinitionId(method_def_id),
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dummy_method_type.0,
));
} else {
// do nothing
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continue;
}
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}
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// 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
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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))
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} 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((
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RwLock::new(TopLevelDef::Initializer { class_id: DefinitionId(class_def_id) })
.into(),
None,
));
Ok((class_name, DefinitionId(class_def_id)))
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}
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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((
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RwLock::new(Self::make_top_level_function_def(
name.into(),
// unify with correct type later
self.unifier.get_fresh_var().0,
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resolver,
))
.into(),
Some(ast),
));
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// return
Ok((fun_name, DefinitionId(self.definition_ast_list.len() - 1)))
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}
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_ => Err("only registrations of top level classes/functions are supprted".into()),
}
}
/// step 1, analyze the type vars associated with top level class
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/// note that we make a duplicate of the type var returned by symbol resolver
/// since one top level type var may be used at multiple places
fn analyze_top_level_class_type_var(&mut self) -> Result<(), String> {
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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() {
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if let Some(ast::Located {
node: ast::StmtKind::ClassDef { bases, .. }, ..
}) = class_ast
{
(bases, type_vars, resolver)
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} else {
unreachable!("must be both class")
}
} else {
continue;
}
};
let class_resolver = class_resolver.as_ref().unwrap();
let class_resolver = class_resolver.deref();
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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"
)
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} =>
{
if !is_generic {
is_generic = true;
} else {
return Err("Only single Generic[...] can be in bases".into());
}
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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());
}
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// parse the type vars
let type_vars = type_var_list
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.into_iter()
.map(|e| {
class_resolver.parse_type_annotation(
&temp_def_list,
unifier,
primitives_store,
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e,
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)
})
.collect::<Result<Vec<_>, _>>()?;
// check if all are unique type vars
let all_unique_type_var = {
let mut occured_type_var_id: HashSet<u32> = HashSet::new();
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());
}
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// NOTE: create a copy of all type vars for the type vars associated with class
let type_vars = type_vars
.into_iter()
.map(|x| {
// must be type var here after previous check
let dup = duplicate_type_var(unifier, x);
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(dup.2, dup.0)
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})
.collect_vec();
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// add to TopLevelDef
class_def_type_vars.extend(type_vars);
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}
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// if others, do nothing in this function
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_ => continue,
}
}
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}
Ok(())
}
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/// step 2, base classes.
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/// now that the type vars of all classes are done, handle base classes and
/// put Self class into the ancestors list. We only allow single inheritance
fn analyze_top_level_class_bases(&mut self) -> Result<(), String> {
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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, class_id, class_type_vars) = {
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if let TopLevelDef::Class { ancestors, resolver, object_id, type_vars, .. } =
class_def.deref_mut()
{
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if let Some(ast::Located {
node: ast::StmtKind::ClassDef { bases, .. }, ..
}) = class_ast
{
(bases, ancestors, resolver, *object_id, type_vars)
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} else {
unreachable!("must be both class")
}
} else {
continue;
}
};
let class_resolver = class_resolver.as_ref().unwrap();
let class_resolver = class_resolver.deref();
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// only allow single inheritance
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"
)
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) {
continue;
}
if has_base {
return Err("a class def can only have at most one base class \
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declaration and one generic declaration"
.into());
}
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has_base = true;
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let base_ty = parse_ast_to_type_annotation_kinds(
class_resolver,
&temp_def_list,
self.unifier.borrow_mut(),
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&self.primitives_ty,
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b,
)?;
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if let TypeAnnotation::CustomClassKind { id, .. } = &base_ty {
// check to prevent cyclic base class
let all_base = Self::get_all_base(*id, &temp_def_list);
if all_base.contains(&class_id) {
return Err("cyclic base detected".into());
}
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// find the intersection of type vars occured
// in the base class type parameter
// and the type vars occured in the class generic declaration
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let type_var_occured_in_base =
get_type_var_contained_in_type_annotation(&base_ty);
for type_ann in type_var_occured_in_base {
if let TypeAnnotation::TypeVarKind(id, ty) = type_ann {
for (ty_id, class_typvar_ty) in class_type_vars.iter() {
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// if they refer to the same top level defined
// type var, we unify them together
if id == *ty_id {
// assert to make sure
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assert!(matches!(
self.unifier.get_ty(ty).as_ref(),
TypeEnum::TVar { .. }
));
self.unifier.unify(ty, *class_typvar_ty)?;
}
}
} else {
unreachable!("must be type var annotation")
}
}
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class_ancestors.push(base_ty);
} else {
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return Err("class base declaration can only be custom class".into());
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}
}
// push self to the ancestors
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class_ancestors.push(make_self_type_annotation(
&temp_def_list,
class_id,
self.unifier.borrow_mut(),
)?)
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}
Ok(())
}
/// step 3, class fields and methods
fn analyze_top_level_class_fields_methods(&mut self) -> Result<(), String> {
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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;
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let mut type_var_to_concrete_def: HashMap<Type, TypeAnnotation> = HashMap::new();
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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,
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&mut type_var_to_concrete_def,
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)?
}
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// base class methods add and check
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// TODO:
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// unification of previously assigned typevar
for (ty, def) in type_var_to_concrete_def {
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let target_ty =
get_type_from_type_annotation_kinds(&temp_def_list, unifier, primitives, &def)?;
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unifier.unify(ty, target_ty)?;
}
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Ok(())
}
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/// 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 {
// no ast, class method, continue
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continue;
};
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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();
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// occured type vars should not be handled separately
let mut occured_type_var: HashMap<u32, Type> = HashMap::new();
let mut function_var_map: HashMap<u32, Type> = HashMap::new();
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let arg_types = {
// make sure no duplicate parameter
let mut defined_paramter_name: HashSet<String> = 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());
}
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args.args
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.iter()
.map(|x| -> Result<FuncArg, String> {
let annotation = x
.node
.annotation
.as_ref()
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.ok_or_else(|| {
"function parameter type annotation needed".to_string()
})?
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.as_ref();
let type_annotation = parse_ast_to_type_annotation_kinds(
resolver,
temp_def_list.as_slice(),
unifier,
primitives_store,
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annotation,
)?;
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// if there are same type variables appears, we only need to copy them once
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let type_vars_within =
get_type_var_contained_in_type_annotation(&type_annotation)
.into_iter()
.map(|x| {
if let TypeAnnotation::TypeVarKind(id, ty) = x {
// assert here to make sure the ty is TypeEnum::TVar
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assert!(matches!(
unifier.get_ty(ty).as_ref(),
TypeEnum::TVar { .. }
));
(id, ty)
} else {
unreachable!("must be type var annotation kind")
}
})
.collect_vec();
for (top_level_var_id, ty) in type_vars_within {
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if let Some(occured_ty) =
occured_type_var.get(&top_level_var_id)
{
// if already occured, we unify this two duplicated
// type var of the same top level type var
unifier.unify(ty, *occured_ty)?;
} else {
// if not, put it into the occured type var hashmap,
// since parse_ast_to_type_var already duplicated it
// we do not need to duplicate it again
occured_type_var.insert(top_level_var_id, ty);
// the type var map to it self
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if let TypeEnum::TVar { id: self_id, .. } =
unifier.get_ty(ty).as_ref()
{
function_var_map.insert(*self_id, ty);
} else {
unreachable!("must be type var");
}
}
}
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// NOTE: get the actual ty after handling the type vars, really? why?
let ty = get_type_from_type_annotation_kinds(
temp_def_list.as_ref(),
unifier,
primitives_store,
&type_annotation,
)?;
// TODO: default value?
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Ok(FuncArg {
name: x.node.arg.clone(),
ty,
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default_value: Default::default(),
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})
})
.collect::<Result<Vec<_>, _>>()?
};
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let return_ty_annotation = {
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let return_annotation = returns
.as_ref()
.ok_or_else(|| "function return type needed".to_string())?
.as_ref();
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parse_ast_to_type_annotation_kinds(
resolver,
&temp_def_list,
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unifier,
primitives_store,
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return_annotation,
)?
};
let type_vars_within =
get_type_var_contained_in_type_annotation(&return_ty_annotation)
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.into_iter()
.map(|x| {
if let TypeAnnotation::TypeVarKind(id, ty) = x {
(id, ty)
} else {
unreachable!("must be type var here")
}
})
.collect_vec();
for (top_level_var_id, ty) in type_vars_within {
if let Some(existing_ty) = occured_type_var.get(&top_level_var_id) {
// should not return err here
unifier.unify(ty, *existing_ty)?;
} else {
occured_type_var.insert(top_level_var_id, ty);
}
}
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// NOTE: get the actual ty after handling the type vars, really? why?
let return_ty = get_type_from_type_annotation_kinds(
&temp_def_list,
unifier,
primitives_store,
&return_ty_annotation,
)?;
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let function_ty = unifier.add_ty(TypeEnum::TFunc(
FunSignature { args: arg_types, ret: return_ty, vars: function_var_map }
.into(),
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));
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unifier.unify(*dummy_ty, function_ty)?;
} else {
unreachable!("must be both function");
}
} else {
continue;
}
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}
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Ok(())
}
/// step 5, field instantiation?
fn analyze_top_level_field_instantiation(&mut self) -> Result<(), String> {
// TODO:
unimplemented!()
}
fn analyze_single_class(
class_def: Arc<RwLock<TopLevelDef>>,
class_ast: &ast::StmtKind<()>,
temp_def_list: &[Arc<RwLock<TopLevelDef>>],
unifier: &mut Unifier,
primitives: &PrimitiveStore,
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type_var_to_concrete_def: &mut HashMap<Type, TypeAnnotation>,
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) -> Result<(), String> {
let mut class_def = class_def.write();
let (
class_id,
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_class_name,
_class_bases_ast,
class_body_ast,
_class_ancestor_def,
class_fields_def,
class_methods_def,
class_type_vars_def,
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class_resolver,
) = if let TopLevelDef::Class {
object_id,
ancestors,
fields,
methods,
resolver,
type_vars,
..
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} = class_def.deref_mut()
{
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if let ast::StmtKind::ClassDef { name, bases, body, .. } = &class_ast {
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(
object_id,
name.clone(),
bases,
body,
ancestors,
fields,
methods,
type_vars,
resolver,
)
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} 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 class_resolver = class_resolver.as_ref();
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for b in class_body_ast {
if let ast::StmtKind::FunctionDef { args, returns, name, body, .. } = &b.node {
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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
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// from the duplicated type var's var_id to themselves
// include the class type vars like the type var context of the method
let mut method_var_map: HashMap<u32, Type> = class_type_vars_def
.iter()
.map(|(_, ty)| {
if let TypeEnum::TVar { id, .. } = unifier.get_ty(*ty).as_ref() {
(*id, *ty)
} else {
unreachable!("must be type var here")
}
})
.collect();
// from the def_id of top level type vars to duplicated type vars
// also include the class type var like the type var context of the method
let mut occured_type_vars: HashMap<u32, Type> =
class_type_vars_def.iter().map(|(id, ty)| (*id, *ty)).collect();
let arg_types: Vec<FuncArg> = {
// check method parameters cannot have same name
let mut defined_paramter_name: HashSet<String> = 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());
}
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let mut result = Vec::new();
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for x in &args.args {
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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,
)?
};
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// find type vars within this method parameter type annotation
let type_vars_within =
get_type_var_contained_in_type_annotation(&type_ann);
// handle the class type var and the method type var
for type_var_within in type_vars_within {
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if let TypeAnnotation::TypeVarKind(top_level_id, ty) =
type_var_within
{
if let Some(duped_ty) = occured_type_vars.get(&top_level_id) {
// if already occured, not matter if it is class typevar or method typevar, just unify
unifier.unify(ty, *duped_ty)?;
} else {
// if not insert them to the occured_type_vars and the method_varmap
// note that the content to insert is different
occured_type_vars.insert(top_level_id, ty);
method_var_map.insert(
if let TypeEnum::TVar { id, .. } =
unifier.get_ty(ty).as_ref()
{
*id
} else {
unreachable!("must be type var")
},
ty,
);
}
} else {
unreachable!("must be type var annotation");
}
}
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// finish handling type vars
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
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// `self`??, but we do it here
let dummy_func_arg = FuncArg {
name: "self".into(),
ty: unifier.get_fresh_var().0,
default_value: None,
};
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type_var_to_concrete_def.insert(
dummy_func_arg.ty,
make_self_type_annotation(temp_def_list, *class_id, unifier)?,
);
result.push(dummy_func_arg);
}
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}
result
};
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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,
)?;
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// find type vars within this return type annotation
let type_vars_within =
get_type_var_contained_in_type_annotation(&annotation);
// handle the class type var and the method type var
for type_var_within in type_vars_within {
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if let TypeAnnotation::TypeVarKind(top_id, ty) = type_var_within {
if let Some(duped_ty) = occured_type_vars.get(&top_id) {
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// if already occured, not matter if it is class typevar or method typevar, just unify
unifier.unify(ty, *duped_ty)?;
} else {
// if not insert them to the occured_type_vars and the method_varmap
// note that the content to insert is different
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occured_type_vars.insert(top_id, ty);
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method_var_map.insert(
if let TypeEnum::TVar { id, .. } =
unifier.get_ty(ty).as_ref()
{
*id
} else {
unreachable!("must be type var")
},
ty,
);
}
} else {
unreachable!("must be type var annotation");
}
}
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;
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type_var_to_concrete_def.insert(
dummy_return_type,
make_self_type_annotation(temp_def_list, *class_id, unifier)?,
);
dummy_return_type
}
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};
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let method_type = unifier.add_ty(TypeEnum::TFunc(
FunSignature { args: arg_types, ret: ret_type, vars: method_var_map }.into(),
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));
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// NOTE: unify now since function type is not in type annotation define
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// which is fine since type within method_type will be subst later
unifier.unify(method_dummy_ty, method_type)?;
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// class fields
if name == "__init__" {
for b in body {
let mut defined_fields: HashSet<String> = HashSet::new();
// TODO: check the type of value, field instantiation check?
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if let ast::StmtKind::AnnAssign { annotation, target, value: _, .. } =
&b.node
{
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if let ast::ExprKind::Attribute { value, attr, .. } = &target.node {
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if matches!(&value.node, ast::ExprKind::Name { id, .. } if id == "self")
{
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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));
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let annotation = parse_ast_to_type_annotation_kinds(
class_resolver,
&temp_def_list,
unifier,
primitives,
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annotation.as_ref(),
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)?;
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// find type vars within this return type annotation
let type_vars_within =
get_type_var_contained_in_type_annotation(&annotation);
// handle the class type var and the method type var
for type_var_within in type_vars_within {
if let TypeAnnotation::TypeVarKind(top_level_id, ty) =
type_var_within
{
if let Some(duped_ty) =
occured_type_vars.get(&top_level_id)
{
// if already occured, not matter if it is class typevar or method typevar, just unify
unifier.unify(ty, *duped_ty)?;
} else {
return Err("this type var is not available inside this function".into());
}
} else {
unreachable!("must be type var annotation");
}
}
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type_var_to_concrete_def
.insert(dummy_field_type, annotation);
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} else {
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return Err("same class fields defined twice".into());
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}
}
}
}
}
}
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} else {
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continue;
}
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}
Ok(())
}
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}