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use std::borrow::Cow;
use fxhash::FxHashMap;
use stc_ts_errors::{debug::dump_type_as_string, DebugExt};
use stc_ts_types::{ClassDef, ClassMember, ClassProperty, Id, Interface, Method, Type, TypeElement, TypeParam};
use stc_utils::cache::Freeze;
use swc_common::{Span, Spanned};
use tracing::info;
use crate::{analyzer::Analyzer, VResult};
impl Analyzer<'_, '_> {
fn type_element_to_class_member(&mut self, el: &TypeElement) -> VResult<Option<ClassMember>> {
match el {
TypeElement::Call(_) => Ok(None),
TypeElement::Constructor(c) => Ok(Some(ClassMember::Constructor(c.clone()))),
TypeElement::Property(p) => Ok(Some(ClassMember::Property(ClassProperty {
span: p.span,
key: p.key.clone(),
value: p.type_ann.clone(),
is_static: false,
accessibility: p.accessibility,
is_abstract: false,
is_optional: p.optional,
readonly: p.readonly,
definite: false,
accessor: p.accessor,
}))),
TypeElement::Method(m) => Ok(Some(ClassMember::Method(Method {
span: m.span,
accessibility: m.accessibility,
key: m.key.clone(),
is_static: false,
is_abstract: false,
is_optional: m.optional,
type_params: m.type_params.clone(),
params: m.params.clone(),
ret_ty: m.ret_ty.clone().unwrap_or_else(|| box Type::any(m.span, Default::default())),
}))),
TypeElement::Index(i) => Ok(Some(ClassMember::IndexSignature(i.clone()))),
}
}
fn merge_from_to(&mut self, span: Span, a: Type, b: Type) -> VResult<Option<Type>> {
if self.config.is_builtin {
return Ok(None);
}
debug_assert!(a.is_clone_cheap());
debug_assert!(b.is_clone_cheap());
match (a.normalize(), b.normalize()) {
(Type::ClassDef(a), Type::Interface(bi)) => {
let mut type_params = FxHashMap::default();
if let Some(b_tps) = &bi.type_params {
if let Some(a_tp) = &a.type_params {
for (idx, b_tp) in b_tps.params.iter().enumerate() {
if let Some(a_param) = a_tp.params.get(idx) {
type_params.insert(
b_tp.name.clone(),
Type::Param(TypeParam {
span: a_tp.span,
name: a_param.name.clone(),
constraint: None,
default: None,
metadata: Default::default(),
tracker: Default::default(),
}),
);
}
}
}
}
let b = self.expand_type_params(&type_params, b, Default::default())?;
let mut new_members = a.body.clone();
let b = self
.convert_type_to_type_lit(span, Cow::Owned(b))
.context("tried to convert an interface to a type literal to merge with a class definition")?;
if let Some(b) = b {
for el in &b.members {
new_members.extend(self.type_element_to_class_member(el)?);
}
return Ok(Some(Type::ClassDef(
ClassDef {
body: new_members,
..(**a).clone()
}
.into(),
)));
}
}
(Type::Interface(a), Type::Interface(bi)) => {
let mut type_params = FxHashMap::default();
if let Some(b_tps) = &bi.type_params {
if let Some(a_tp) = &a.type_params {
for (idx, b_tp) in b_tps.params.iter().enumerate() {
type_params.insert(
b_tp.name.clone(),
Type::Param(TypeParam {
span: a_tp.span,
name: a_tp.params[idx].name.clone(),
constraint: None,
default: None,
metadata: Default::default(),
tracker: Default::default(),
}),
);
}
}
}
let b = self.expand_type_params(&type_params, b, Default::default())?.freezed();
let mut new_members = a.body.clone();
if let Some(b) = self
.convert_type_to_type_lit(span, Cow::Owned(b))
.context("tried to convert an interface to a type literal")?
{
new_members.extend(b.into_owned().members);
return Ok(Some(Type::Interface(Interface {
body: new_members,
..a.clone()
})));
}
}
_ => {}
}
Ok(None)
}
fn merge_declaration_types(&mut self, span: Span, orig: Type, new: Type) -> VResult<Type> {
debug_assert!(orig.is_clone_cheap());
debug_assert!(new.is_clone_cheap());
if let Some(new_ty) = self.merge_from_to(span, orig.clone(), new.clone())? {
return Ok(new_ty);
}
if let Some(new_ty) = self.merge_from_to(span, new.clone(), orig)? {
return Ok(new_ty);
}
Ok(new)
}
pub(crate) fn merge_decl_with_name(&mut self, name: Id, new: Type) -> VResult<(Type, bool)> {
let orig = self.find_type(&name)?;
let mut orig = match orig {
Some(v) => v,
None => return Ok((new, false)),
};
let orig = orig.next().unwrap().into_owned();
let new = self.merge_declaration_types(new.span(), orig, new)?;
info!("Merging declaration {} with type {}", name, dump_type_as_string(&new));
Ok((new, true))
}
}
