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erg/crates/erg_compiler/context/inquire.rs
Shunsuke Shibayama aa2cea60dd fix: quantified subroutine subtyping bugs
2023-02-22 02:40:51 +09:00

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// (type) getters & validators
use std::option::Option; // conflicting to Type::Option
use std::path::{Path, PathBuf};
use erg_common::config::{ErgConfig, Input};
use erg_common::env::{erg_pystd_path, erg_std_path};
use erg_common::error::{ErrorCore, ErrorKind, Location, SubMessage};
use erg_common::levenshtein::get_similar_name;
use erg_common::set::Set;
use erg_common::traits::{Locational, NoTypeDisplay, Stream};
use erg_common::vis::Visibility;
use erg_common::Str;
use erg_common::{
fmt_option, fmt_slice, log, normalize_path, option_enum_unwrap, set, switch_lang,
};
use Type::*;
use ast::VarName;
use erg_parser::ast::{self, Identifier};
use erg_parser::token::Token;
use crate::ty::constructors::{anon, free_var, func, mono, poly, proc, proj, ref_, subr_t};
use crate::ty::free::Constraint;
use crate::ty::typaram::TyParam;
use crate::ty::value::{GenTypeObj, TypeObj, ValueObj};
use crate::ty::{HasType, ParamTy, SubrKind, SubrType, Type};
use crate::context::instantiate::ConstTemplate;
use crate::context::{Context, RegistrationMode, TraitImpl, TyVarCache, Variance};
use crate::error::{
binop_to_dname, readable_name, unaryop_to_dname, SingleTyCheckResult, TyCheckError,
TyCheckErrors, TyCheckResult,
};
use crate::varinfo::{AbsLocation, Mutability, VarInfo, VarKind};
use crate::{feature_error, hir};
use crate::{unreachable_error, AccessKind};
use RegistrationMode::*;
use Visibility::*;
use super::instantiate::ParamKind;
use super::{ContextKind, MethodInfo};
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum SubstituteResult {
Ok,
__Call__(Type),
Coerced(Type),
}
impl Context {
pub(crate) fn get_ctx_from_path(&self, path: &Path) -> Option<&Context> {
self.mod_cache()
.ref_ctx(path)
.or_else(|| self.py_mod_cache().ref_ctx(path))
.map(|mod_ctx| &mod_ctx.context)
}
pub(crate) fn get_current_scope_var(&self, name: &VarName) -> Option<&VarInfo> {
self.locals
.get(name)
.or_else(|| self.decls.get(name))
.or_else(|| {
self.params
.iter()
.find(|(opt_name, _)| opt_name.as_ref().map(|n| n == name).unwrap_or(false))
.map(|(_, vi)| vi)
})
.or_else(|| {
for (_, methods) in self.methods_list.iter() {
if let Some(vi) = methods.get_current_scope_var(name) {
return Some(vi);
}
}
None
})
}
pub(crate) fn get_mut_current_scope_var(&mut self, name: &VarName) -> Option<&mut VarInfo> {
self.locals
.get_mut(name)
.or_else(|| self.decls.get_mut(name))
.or_else(|| {
self.params
.iter_mut()
.find(|(opt_name, _)| opt_name.as_ref().map(|n| n == name).unwrap_or(false))
.map(|(_, vi)| vi)
})
.or_else(|| {
for (_, methods) in self.methods_list.iter_mut() {
if let Some(vi) = methods.get_mut_current_scope_var(name) {
return Some(vi);
}
}
None
})
}
pub(crate) fn get_var_kv(&self, name: &str) -> Option<(&VarName, &VarInfo)> {
self.locals
.get_key_value(name)
.or_else(|| self.get_outer().and_then(|ctx| ctx.get_var_kv(name)))
}
pub fn get_singular_ctx_by_hir_expr(
&self,
obj: &hir::Expr,
namespace: &Str,
) -> SingleTyCheckResult<&Context> {
match obj {
hir::Expr::Accessor(hir::Accessor::Ident(ident)) => {
self.get_singular_ctx_by_ident(&ident.clone().downcast(), namespace)
}
hir::Expr::Accessor(hir::Accessor::Attr(attr)) => {
// REVIEW: 両方singularとは限らない?
let ctx = self.get_singular_ctx_by_hir_expr(&attr.obj, namespace)?;
let attr = hir::Expr::Accessor(hir::Accessor::Ident(attr.ident.clone()));
ctx.get_singular_ctx_by_hir_expr(&attr, namespace)
}
// TODO: change error
_ => Err(TyCheckError::no_var_error(
self.cfg.input.clone(),
line!() as usize,
obj.loc(),
self.caused_by(),
&obj.to_string(),
None,
)),
}
}
pub(crate) fn get_singular_ctx_by_ident(
&self,
ident: &ast::Identifier,
namespace: &Str,
) -> SingleTyCheckResult<&Context> {
self.get_mod(ident.inspect())
.or_else(|| self.rec_get_type(ident.inspect()).map(|(_, ctx)| ctx))
.or_else(|| self.rec_get_patch(ident.inspect()))
.ok_or_else(|| {
TyCheckError::no_var_error(
self.cfg.input.clone(),
line!() as usize,
ident.loc(),
namespace.into(),
ident.inspect(),
self.get_similar_name(ident.inspect()),
)
})
}
pub(crate) fn get_mut_singular_ctx_by_ident(
&mut self,
ident: &ast::Identifier,
namespace: &Str,
) -> SingleTyCheckResult<&mut Context> {
let err = TyCheckError::no_var_error(
self.cfg.input.clone(),
line!() as usize,
ident.loc(),
namespace.into(),
ident.inspect(),
self.get_similar_name(ident.inspect()),
);
self.get_mut_type(ident.inspect())
.map(|(_, ctx)| ctx)
.ok_or(err)
}
pub(crate) fn get_singular_ctx(
&self,
obj: &ast::Expr,
namespace: &Str,
) -> SingleTyCheckResult<&Context> {
match obj {
ast::Expr::Accessor(ast::Accessor::Ident(ident)) => {
self.get_singular_ctx_by_ident(ident, namespace)
}
ast::Expr::Accessor(ast::Accessor::Attr(attr)) => {
// REVIEW: 両方singularとは限らない?
let ctx = self.get_singular_ctx(&attr.obj, namespace)?;
let attr = ast::Expr::Accessor(ast::Accessor::Ident(attr.ident.clone()));
ctx.get_singular_ctx(&attr, namespace)
}
_ => Err(TyCheckError::no_var_error(
self.cfg.input.clone(),
line!() as usize,
obj.loc(),
self.caused_by(),
&obj.to_string(),
None,
)),
}
}
pub(crate) fn get_mut_singular_ctx(
&mut self,
obj: &ast::Expr,
namespace: &Str,
) -> SingleTyCheckResult<&mut Context> {
match obj {
ast::Expr::Accessor(ast::Accessor::Ident(ident)) => {
self.get_mut_singular_ctx_by_ident(ident, namespace)
}
ast::Expr::Accessor(ast::Accessor::Attr(attr)) => {
// REVIEW: 両方singularとは限らない?
let ctx = self.get_mut_singular_ctx(&attr.obj, namespace)?;
let attr = ast::Expr::Accessor(ast::Accessor::Ident(attr.ident.clone()));
ctx.get_mut_singular_ctx(&attr, namespace)
}
_ => Err(TyCheckError::no_var_error(
self.cfg.input.clone(),
line!() as usize,
obj.loc(),
self.caused_by(),
&obj.to_string(),
None,
)),
}
}
fn get_match_call_t(
&self,
kind: SubrKind,
pos_args: &[hir::PosArg],
kw_args: &[hir::KwArg],
) -> TyCheckResult<VarInfo> {
if !kw_args.is_empty() {
// TODO: this error desc is not good
return Err(TyCheckErrors::from(TyCheckError::default_param_error(
self.cfg.input.clone(),
line!() as usize,
kw_args[0].loc(),
self.caused_by(),
"match",
)));
}
for pos_arg in pos_args.iter().skip(1) {
let t = pos_arg.expr.ref_t();
// Allow only anonymous functions to be passed as match arguments (for aesthetic reasons)
if !matches!(&pos_arg.expr, hir::Expr::Lambda(_)) {
return Err(TyCheckErrors::from(TyCheckError::type_mismatch_error(
self.cfg.input.clone(),
line!() as usize,
pos_arg.loc(),
self.caused_by(),
"match",
None,
&mono("LambdaFunc"),
t,
self.get_candidates(t),
self.get_simple_type_mismatch_hint(&mono("LambdaFunc"), t),
)));
}
}
let match_target_expr_t = pos_args[0].expr.ref_t();
// Never or T => T
let mut union_pat_t = Type::Never;
for (i, pos_arg) in pos_args.iter().skip(1).enumerate() {
let lambda = erg_common::enum_unwrap!(&pos_arg.expr, hir::Expr::Lambda); // already checked
if !lambda.params.defaults.is_empty() {
return Err(TyCheckErrors::from(TyCheckError::default_param_error(
self.cfg.input.clone(),
line!() as usize,
pos_args[i + 1].loc(),
self.caused_by(),
"match",
)));
}
if lambda.params.len() != 1 {
return Err(TyCheckErrors::from(TyCheckError::param_error(
self.cfg.input.clone(),
line!() as usize,
pos_args[i + 1].loc(),
self.caused_by(),
1,
lambda.params.len(),
)));
}
let mut dummy_tv_cache = TyVarCache::new(self.level, self);
let rhs = self.instantiate_param_sig_t(
&lambda.params.non_defaults[0].raw,
None,
&mut dummy_tv_cache,
Normal,
ParamKind::NonDefault,
)?;
union_pat_t = self.union(&union_pat_t, &rhs);
}
// NG: expr_t: Nat, union_pat_t: {1, 2}
// OK: expr_t: Int, union_pat_t: {1} or 'T
if self
.sub_unify(match_target_expr_t, &union_pat_t, &pos_args[0], None)
.is_err()
{
return Err(TyCheckErrors::from(TyCheckError::match_error(
self.cfg.input.clone(),
line!() as usize,
pos_args[0].loc(),
self.caused_by(),
match_target_expr_t,
)));
}
let branch_ts = pos_args
.iter()
.skip(1)
.map(|a| ParamTy::anonymous(a.expr.ref_t().clone()))
.collect::<Vec<_>>();
let Some(mut return_t) = branch_ts.get(0).and_then(|branch| {
branch.typ()
.return_t()
.cloned()
}) else {
return Err(TyCheckErrors::from(TyCheckError::args_missing_error(
self.cfg.input.clone(),
line!() as usize,
pos_args[0].loc(),
"match",
self.caused_by(),
vec![Str::ever("obj")],
)));
};
for arg_t in branch_ts.iter().skip(1) {
// TODO: handle unwrap errors
return_t = self.union(&return_t, arg_t.typ().return_t().unwrap_or(&Type::Never));
}
let param_ty = ParamTy::anonymous(match_target_expr_t.clone());
let param_ts = [vec![param_ty], branch_ts.to_vec()].concat();
let t = if kind.is_func() {
func(param_ts, None, vec![], return_t)
} else {
proc(param_ts, None, vec![], return_t)
};
Ok(VarInfo {
t,
..VarInfo::default()
})
}
pub(crate) fn rec_get_var_info(
&self,
ident: &Identifier,
acc_kind: AccessKind,
input: &Input,
namespace: &Str,
) -> SingleTyCheckResult<VarInfo> {
if let Some(vi) = self.get_current_scope_var(&ident.name) {
match self.validate_visibility(ident, vi, input, namespace) {
Ok(()) => {
return Ok(vi.clone());
}
Err(err) => {
if !acc_kind.is_local() {
return Err(err);
}
}
}
} else if let Some((name, _vi)) = self
.future_defined_locals
.get_key_value(&ident.inspect()[..])
{
return Err(TyCheckError::access_before_def_error(
input.clone(),
line!() as usize,
ident.loc(),
namespace.into(),
ident.inspect(),
name.ln_begin().unwrap_or(0),
self.get_similar_name(ident.inspect()),
));
} else if let Some((name, _vi)) = self.deleted_locals.get_key_value(&ident.inspect()[..]) {
return Err(TyCheckError::access_deleted_var_error(
input.clone(),
line!() as usize,
ident.loc(),
namespace.into(),
ident.inspect(),
name.ln_begin().unwrap_or(0),
self.get_similar_name(ident.inspect()),
));
}
if acc_kind.is_local() {
if let Some(parent) = self.get_outer().or_else(|| self.get_builtins()) {
return match parent.rec_get_var_info(ident, acc_kind, input, namespace) {
Ok(vi) => Ok(vi),
Err(err) => Err(err),
};
}
}
Err(TyCheckError::no_var_error(
input.clone(),
line!() as usize,
ident.loc(),
namespace.into(),
ident.inspect(),
self.get_similar_name(ident.inspect()),
))
}
pub(crate) fn rec_get_decl_info(
&self,
ident: &Identifier,
acc_kind: AccessKind,
input: &Input,
namespace: &Str,
) -> SingleTyCheckResult<VarInfo> {
if let Some(vi) = self
.decls
.get(&ident.inspect()[..])
.or_else(|| self.future_defined_locals.get(&ident.inspect()[..]))
{
match self.validate_visibility(ident, vi, input, namespace) {
Ok(()) => {
return Ok(vi.clone());
}
Err(err) => {
if !acc_kind.is_local() {
return Err(err);
}
}
}
}
if acc_kind.is_local() {
if let Some(parent) = self.get_outer().or_else(|| self.get_builtins()) {
return parent.rec_get_decl_info(ident, acc_kind, input, namespace);
}
}
Err(TyCheckError::no_var_error(
input.clone(),
line!() as usize,
ident.loc(),
namespace.into(),
ident.inspect(),
self.get_similar_name(ident.inspect()),
))
}
pub(crate) fn get_attr_info(
&self,
obj: &hir::Expr,
ident: &Identifier,
input: &Input,
namespace: &Str,
) -> SingleTyCheckResult<VarInfo> {
let self_t = obj.t();
let name = ident.name.token();
match self.get_attr_info_from_attributive(&self_t, ident, namespace) {
Ok(vi) => {
return Ok(vi);
}
Err(e) if e.core.kind == ErrorKind::AttributeError => {}
Err(e) => {
return Err(e);
}
}
if let Ok(singular_ctx) = self.get_singular_ctx_by_hir_expr(obj, namespace) {
match singular_ctx.rec_get_var_info(ident, AccessKind::Attr, input, namespace) {
Ok(vi) => {
return Ok(vi);
}
Err(e) if e.core.kind == ErrorKind::NameError => {}
Err(e) => {
return Err(e);
}
}
}
match self.get_attr_from_nominal_t(obj, ident, input, namespace) {
Ok(vi) => {
if let Some(self_t) = vi.t.self_t() {
self.sub_unify(obj.ref_t(), self_t, obj, Some(&"self".into()))
.map_err(|mut e| e.remove(0))?;
}
return Ok(vi);
}
Err(e) if e.core.kind == ErrorKind::AttributeError => {}
Err(e) => {
return Err(e);
}
}
let allow_cast = true;
for patch in self.find_patches_of(obj.ref_t(), allow_cast) {
if let Some(vi) = patch
.locals
.get(ident.inspect())
.or_else(|| patch.decls.get(ident.inspect()))
{
self.validate_visibility(ident, vi, input, namespace)?;
return Ok(vi.clone());
}
for (_, methods_ctx) in patch.methods_list.iter() {
if let Some(vi) = methods_ctx
.locals
.get(ident.inspect())
.or_else(|| methods_ctx.decls.get(ident.inspect()))
{
self.validate_visibility(ident, vi, input, namespace)?;
return Ok(vi.clone());
}
}
}
Err(TyCheckError::no_attr_error(
input.clone(),
line!() as usize,
name.loc(),
namespace.into(),
&self_t,
name.inspect(),
self.get_similar_attr(&self_t, name.inspect()),
))
}
fn get_attr_from_nominal_t(
&self,
obj: &hir::Expr,
ident: &Identifier,
input: &Input,
namespace: &Str,
) -> SingleTyCheckResult<VarInfo> {
let self_t = obj.t();
if let Some(sups) = self.get_nominal_super_type_ctxs(&self_t) {
for ctx in sups {
match ctx.rec_get_var_info(ident, AccessKind::Attr, input, namespace) {
Ok(vi) => {
return Ok(vi);
}
Err(e) if e.core.kind == ErrorKind::NameError => {}
Err(e) => {
return Err(e);
}
}
// if self is a methods context
if let Some(ctx) = self.get_same_name_context(&ctx.name) {
match ctx.rec_get_var_info(ident, AccessKind::Method, input, namespace) {
Ok(vi) => {
return Ok(vi);
}
Err(e) if e.core.kind == ErrorKind::NameError => {}
Err(e) => {
return Err(e);
}
}
}
}
}
let coerced = self
.deref_tyvar(obj.t(), Variance::Covariant, &set! {}, &())
.map_err(|mut es| es.remove(0))?;
if obj.ref_t() != &coerced {
for ctx in self.get_nominal_super_type_ctxs(&coerced).ok_or_else(|| {
TyCheckError::type_not_found(
self.cfg.input.clone(),
line!() as usize,
obj.loc(),
self.caused_by(),
&coerced,
)
})? {
match ctx.rec_get_var_info(ident, AccessKind::Attr, input, namespace) {
Ok(vi) => {
obj.ref_t().coerce();
return Ok(vi);
}
Err(e) if e.core.kind == ErrorKind::NameError => {}
Err(e) => {
return Err(e);
}
}
if let Some(ctx) = self.get_same_name_context(&ctx.name) {
match ctx.rec_get_var_info(ident, AccessKind::Method, input, namespace) {
Ok(vi) => {
return Ok(vi);
}
Err(e) if e.core.kind == ErrorKind::NameError => {}
Err(e) => {
return Err(e);
}
}
}
}
}
Err(TyCheckError::no_attr_error(
self.cfg.input.clone(),
line!() as usize,
ident.loc(),
namespace.into(),
&self_t,
ident.inspect(),
self.get_similar_attr(&self_t, ident.inspect()),
))
}
/// get type from given attributive type (Record).
/// not ModuleType or ClassType etc.
fn get_attr_info_from_attributive(
&self,
t: &Type,
ident: &Identifier,
namespace: &Str,
) -> SingleTyCheckResult<VarInfo> {
match t {
// (obj: Never).foo: Never
Type::Never => Ok(VarInfo::ILLEGAL.clone()),
Type::FreeVar(fv) if fv.is_linked() => {
self.get_attr_info_from_attributive(&fv.crack(), ident, namespace)
}
Type::FreeVar(fv) /* if fv.is_unbound() */ => {
let sup = fv.get_super().unwrap();
self.get_attr_info_from_attributive(&sup, ident, namespace)
}
Type::Ref(t) => self.get_attr_info_from_attributive(t, ident, namespace),
Type::RefMut { before, .. } => {
self.get_attr_info_from_attributive(before, ident, namespace)
}
Type::Refinement(refine) => {
self.get_attr_info_from_attributive(&refine.t, ident, namespace)
}
Type::Record(record) => {
if let Some(attr_t) = record.get(ident.inspect()) {
let muty = Mutability::from(&ident.inspect()[..]);
let vi = VarInfo::new(
attr_t.clone(),
muty,
Public,
VarKind::Builtin,
None,
None,
None,
AbsLocation::unknown(),
);
Ok(vi)
} else {
let t = Type::Record(record.clone());
Err(TyCheckError::no_attr_error(
self.cfg.input.clone(),
line!() as usize,
ident.loc(),
namespace.into(),
&t,
ident.inspect(),
self.get_similar_attr(&t, ident.inspect()),
))
}
}
other => {
if let Some(v) = self.rec_get_const_obj(&other.local_name()) {
match v {
ValueObj::Type(TypeObj::Generated(gen)) => self
.get_gen_t_require_attr_t(gen, &ident.inspect()[..])
.map(|attr_t| {
let muty = Mutability::from(&ident.inspect()[..]);
VarInfo::new(
attr_t.clone(),
muty,
Public,
VarKind::Builtin,
None,
None,
None,
AbsLocation::unknown(),
)
})
.ok_or_else(|| {
TyCheckError::no_attr_error(
self.cfg.input.clone(),
line!() as usize,
ident.loc(),
namespace.into(),
t,
ident.inspect(),
self.get_similar_attr(t, ident.inspect()),
)
}),
ValueObj::Type(TypeObj::Builtin(_t)) => {
// FIXME:
Err(TyCheckError::no_attr_error(
self.cfg.input.clone(),
line!() as usize,
ident.loc(),
namespace.into(),
_t,
ident.inspect(),
self.get_similar_attr(_t, ident.inspect()),
))
}
_other => Err(TyCheckError::no_attr_error(
self.cfg.input.clone(),
line!() as usize,
ident.loc(),
namespace.into(),
t,
ident.inspect(),
self.get_similar_attr(t, ident.inspect()),
)),
}
} else {
Err(TyCheckError::no_attr_error(
self.cfg.input.clone(),
line!() as usize,
ident.loc(),
namespace.into(),
t,
ident.inspect(),
self.get_similar_attr(t, ident.inspect()),
))
}
}
}
}
// returns callee's type, not the return type
fn search_callee_info(
&self,
obj: &hir::Expr,
attr_name: &Option<Identifier>,
input: &Input,
namespace: &Str,
) -> SingleTyCheckResult<VarInfo> {
if obj.ref_t() == Type::FAILURE {
// (...Obj) -> Failure
return Ok(VarInfo {
t: Type::Subr(SubrType::new(
SubrKind::Func,
vec![],
Some(ParamTy::pos(None, ref_(Obj))),
vec![],
Failure,
)),
..VarInfo::default()
});
}
if let Some(attr_name) = attr_name.as_ref() {
self.search_method_info(obj, attr_name, input, namespace)
} else {
Ok(VarInfo {
t: obj.t(),
..VarInfo::default()
})
}
}
pub(crate) fn get_same_name_context(&self, name: &str) -> Option<&Context> {
if &self.name[..] == name {
Some(self)
} else {
self.get_outer().and_then(|p| p.get_same_name_context(name))
}
}
fn search_method_info(
&self,
obj: &hir::Expr,
attr_name: &Identifier,
input: &Input,
namespace: &Str,
) -> SingleTyCheckResult<VarInfo> {
for ctx in self
.get_nominal_super_type_ctxs(obj.ref_t())
.ok_or_else(|| {
TyCheckError::type_not_found(
self.cfg.input.clone(),
line!() as usize,
obj.loc(),
self.caused_by(),
obj.ref_t(),
)
})?
{
if let Some(vi) = ctx
.locals
.get(attr_name.inspect())
.or_else(|| ctx.decls.get(attr_name.inspect()))
{
self.validate_visibility(attr_name, vi, input, namespace)?;
return Ok(vi.clone());
}
for (_, methods_ctx) in ctx.methods_list.iter() {
if let Some(vi) = methods_ctx
.locals
.get(attr_name.inspect())
.or_else(|| methods_ctx.decls.get(attr_name.inspect()))
{
self.validate_visibility(attr_name, vi, input, namespace)?;
return Ok(vi.clone());
}
}
if let Some(ctx) = self.get_same_name_context(&ctx.name) {
match ctx.rec_get_var_info(attr_name, AccessKind::Method, input, namespace) {
Ok(t) => {
return Ok(t);
}
Err(e) if e.core.kind == ErrorKind::NameError => {}
Err(e) => {
return Err(e);
}
}
}
}
if let Ok(singular_ctx) = self.get_singular_ctx_by_hir_expr(obj, namespace) {
if let Some(vi) = singular_ctx
.locals
.get(attr_name.inspect())
.or_else(|| singular_ctx.decls.get(attr_name.inspect()))
{
self.validate_visibility(attr_name, vi, input, namespace)?;
return Ok(vi.clone());
}
for (_, method_ctx) in singular_ctx.methods_list.iter() {
if let Some(vi) = method_ctx
.locals
.get(attr_name.inspect())
.or_else(|| method_ctx.decls.get(attr_name.inspect()))
{
self.validate_visibility(attr_name, vi, input, namespace)?;
return Ok(vi.clone());
}
}
return Err(TyCheckError::singular_no_attr_error(
self.cfg.input.clone(),
line!() as usize,
attr_name.loc(),
namespace.into(),
obj.qual_name().unwrap_or("?"),
obj.ref_t(),
attr_name.inspect(),
self.get_similar_attr_from_singular(obj, attr_name.inspect()),
));
}
match self.get_method_type_by_name(attr_name) {
Ok(method) => {
self.sub_unify(obj.ref_t(), &method.definition_type, obj, None)
// HACK: change this func's return type to TyCheckResult<Type>
.map_err(|mut errs| errs.remove(0))?;
return Ok(method.method_type.clone());
}
Err(err) if err.core.kind == ErrorKind::TypeError => {
return Err(err);
}
_ => {}
}
let allow_cast = true;
for patch in self.find_patches_of(obj.ref_t(), allow_cast) {
if let Some(vi) = patch
.locals
.get(attr_name.inspect())
.or_else(|| patch.decls.get(attr_name.inspect()))
{
self.validate_visibility(attr_name, vi, input, namespace)?;
return Ok(vi.clone());
}
for (_, methods_ctx) in patch.methods_list.iter() {
if let Some(vi) = methods_ctx
.locals
.get(attr_name.inspect())
.or_else(|| methods_ctx.decls.get(attr_name.inspect()))
{
self.validate_visibility(attr_name, vi, input, namespace)?;
return Ok(vi.clone());
}
}
}
Err(TyCheckError::no_attr_error(
self.cfg.input.clone(),
line!() as usize,
attr_name.loc(),
namespace.into(),
obj.ref_t(),
attr_name.inspect(),
self.get_similar_attr(obj.ref_t(), attr_name.inspect()),
))
}
fn validate_visibility(
&self,
ident: &Identifier,
vi: &VarInfo,
input: &Input,
namespace: &str,
) -> SingleTyCheckResult<()> {
if ident.vis() != vi.vis {
Err(TyCheckError::visibility_error(
input.clone(),
line!() as usize,
ident.loc(),
self.caused_by(),
ident.inspect(),
vi.vis,
))
// check if the private variable is loaded from the other scope
} else if vi.vis.is_private()
&& &self.name[..] != "<builtins>"
&& &self.name[..] != namespace
&& !namespace.contains(&self.name[..])
{
log!(err "{namespace}/{}", self.name);
Err(TyCheckError::visibility_error(
input.clone(),
line!() as usize,
ident.loc(),
self.caused_by(),
ident.inspect(),
Private,
))
} else {
Ok(())
}
}
// HACK: dname.loc()はダミーLocationしか返さないので、エラーならop.loc()で上書きする
fn append_loc_info(&self, e: TyCheckError, loc: Location) -> TyCheckError {
if e.core.loc == Location::Unknown {
let mut sub_msges = Vec::new();
for sub_msg in e.core.sub_messages {
sub_msges.push(SubMessage::ambiguous_new(loc, sub_msg.msg, sub_msg.hint));
}
let core = ErrorCore::new(
sub_msges,
e.core.main_message,
e.core.errno,
e.core.kind,
e.core.loc,
);
TyCheckError::new(core, self.cfg.input.clone(), e.caused_by)
} else {
e
}
}
pub(crate) fn get_binop_t(
&self,
op: &Token,
args: &[hir::PosArg],
input: &Input,
namespace: &Str,
) -> TyCheckResult<VarInfo> {
erg_common::debug_power_assert!(args.len() == 2);
let cont = binop_to_dname(op.inspect());
// not a `Token::from_str(op.kind, cont)` because ops are defined as symbols
let symbol = Token::symbol(cont);
let t = self.rec_get_var_info(
&Identifier::new(None, VarName::new(symbol.clone())),
AccessKind::Name,
input,
namespace,
)?;
let op = hir::Expr::Accessor(hir::Accessor::private(symbol, t));
self.get_call_t(&op, &None, args, &[], input, namespace)
.map_err(|errs| {
let Some(op_ident ) = option_enum_unwrap!(op, hir::Expr::Accessor:(hir::Accessor::Ident:(_))) else {
return errs;
};
let vi = op_ident.vi.clone();
let lhs = args[0].expr.clone();
let rhs = args[1].expr.clone();
let bin = hir::BinOp::new(op_ident.name.into_token(), lhs, rhs, vi);
let errs = errs
.into_iter()
.map(|e| self.append_loc_info(e, bin.loc()))
.collect();
TyCheckErrors::new(errs)
})
}
pub(crate) fn get_unaryop_t(
&self,
op: &Token,
args: &[hir::PosArg],
input: &Input,
namespace: &Str,
) -> TyCheckResult<VarInfo> {
erg_common::debug_power_assert!(args.len() == 1);
let cont = unaryop_to_dname(op.inspect());
let symbol = Token::symbol(cont);
let vi = self.rec_get_var_info(
&Identifier::new(None, VarName::new(symbol.clone())),
AccessKind::Name,
input,
namespace,
)?;
let op = hir::Expr::Accessor(hir::Accessor::private(symbol, vi));
self.get_call_t(&op, &None, args, &[], input, namespace)
.map_err(|errs| {
let Some(op_ident) = option_enum_unwrap!(op, hir::Expr::Accessor:(hir::Accessor::Ident:(_))) else {
return errs;
};
let vi = op_ident.vi.clone();
let expr = args[0].expr.clone();
let unary = hir::UnaryOp::new(op_ident.name.into_token(), expr, vi);
let errs = errs
.into_iter()
.map(|e| self.append_loc_info(e, unary.loc()))
.collect();
TyCheckErrors::new(errs)
})
}
/// Propagate mutable dependent types changes
/// 可変依存型の変更を伝搬させる
fn propagate(&self, t: &Type, callee: &hir::Expr) -> TyCheckResult<()> {
if let Type::Subr(subr) = t {
if let Some(after) = subr.self_t().and_then(|self_t| {
if let RefMut { after, .. } = self_t {
after.as_ref()
} else {
None
}
}) {
self.reunify(callee.ref_t(), after, callee)?;
}
}
Ok(())
}
fn not_callable_error(
&self,
obj: &hir::Expr,
attr_name: &Option<Identifier>,
other: &Type,
hint: Option<String>,
) -> TyCheckErrors {
let (loc, name) = if let Some(attr_name) = attr_name {
(
Location::concat(obj, attr_name),
(obj.to_string() + &attr_name.to_string()),
)
} else {
(obj.loc(), obj.to_string())
};
let other = self.readable_type(other.clone(), false);
TyCheckErrors::from(TyCheckError::type_mismatch_error(
self.cfg.input.clone(),
line!() as usize,
loc,
self.caused_by(),
&name,
None,
&mono("Callable"),
&other,
self.get_candidates(&other),
hint,
))
}
/// if `obj` has `__call__` method, then the return value is `Some(call_instance)`
///
/// e.g.
/// ```python
/// substitute_call(instance: ((?T, ?U) -> ?T), [Int, Str], []) => instance: (Int, Str) -> Int
/// substitute_call(instance: ((?T, Int) -> ?T), [Int, Nat], []) => instance: (Int, Int) -> Str
/// substitute_call(instance: ((?M(: Nat)..?N(: Nat)) -> ?M+?N), [1..2], []) => instance: (1..2) -> {3}
/// substitute_call(instance: ((?L(: Add(?R, ?O)), ?R) -> ?O), [1, 2], []) => instance: (Nat, Nat) -> Nat
/// substitute_call(instance: ((Failure, ?T) -> ?T), [Int, Int]) => instance: (Failure, Int) -> Int
/// ```
fn substitute_call(
&self,
obj: &hir::Expr,
attr_name: &Option<Identifier>,
instance: &Type,
pos_args: &[hir::PosArg],
kw_args: &[hir::KwArg],
) -> TyCheckResult<SubstituteResult> {
match instance {
Type::FreeVar(fv) if fv.is_linked() => {
self.substitute_call(obj, attr_name, &fv.crack(), pos_args, kw_args)
}
Type::FreeVar(fv) => {
if let Some(sub) = fv.get_sub() {
let allow_cast = true;
if !self.subtype_of(&sub, &mono("GenericCallable"), allow_cast) {
return Err(self.not_callable_error(obj, attr_name, instance, None));
}
if sub != Never {
instance.coerce();
if instance.is_quantified_subr() {
let instance = self.instantiate(instance.clone(), obj)?;
self.substitute_call(obj, attr_name, &instance, pos_args, kw_args)?;
return Ok(SubstituteResult::Coerced(instance));
} else {
return self
.substitute_call(obj, attr_name, instance, pos_args, kw_args);
}
}
}
if let Some(attr_name) = attr_name {
feature_error!(
TyCheckErrors,
TyCheckError,
self,
attr_name.loc(),
"substitute_call for methods/type-var"
)
} else {
let is_procedural = obj
.show_acc()
.map(|acc| acc.ends_with('!'))
.unwrap_or(false);
let kind = if is_procedural {
SubrKind::Proc
} else {
SubrKind::Func
};
let ret_t = free_var(self.level, Constraint::new_type_of(Type));
let non_default_params = pos_args.iter().map(|a| anon(a.expr.t())).collect();
let subr_t = subr_t(kind, non_default_params, None, vec![], ret_t);
self.occur(&subr_t, instance, obj)?;
fv.link(&subr_t);
Ok(SubstituteResult::Ok)
}
}
Type::Refinement(refine) => {
self.substitute_call(obj, attr_name, &refine.t, pos_args, kw_args)
}
// instance must be instantiated
Type::Quantified(_) => unreachable_error!(TyCheckErrors, TyCheckError, self),
Type::Subr(subr) => {
let mut errs = TyCheckErrors::empty();
let is_method = subr.self_t().is_some();
let callee = if let Some(ident) = attr_name {
if is_method {
obj.clone()
} else {
let attr = hir::Attribute::new(
obj.clone(),
hir::Identifier::bare(ident.dot.clone(), ident.name.clone()),
);
hir::Expr::Accessor(hir::Accessor::Attr(attr))
}
} else {
obj.clone()
};
let params_len = subr.non_default_params.len() + subr.default_params.len();
if (params_len < pos_args.len() || params_len < pos_args.len() + kw_args.len())
&& subr.var_params.is_none()
{
return Err(self.gen_too_many_args_error(&callee, subr, pos_args, kw_args));
}
let mut passed_params = set! {};
let non_default_params = if is_method {
let mut non_default_params = subr.non_default_params.iter();
let self_pt = non_default_params.next().unwrap();
if let Err(mut es) =
self.sub_unify(obj.ref_t(), self_pt.typ(), obj, self_pt.name())
{
errs.append(&mut es);
}
non_default_params
} else {
subr.non_default_params.iter()
};
let non_default_params_len = non_default_params.len();
let mut nth = 1;
if pos_args.len() >= non_default_params_len {
let (non_default_args, var_args) = pos_args.split_at(non_default_params_len);
for (nd_arg, nd_param) in non_default_args.iter().zip(non_default_params) {
if let Err(mut es) = self.substitute_pos_arg(
&callee,
attr_name,
&nd_arg.expr,
nth,
nd_param,
&mut passed_params,
) {
errs.append(&mut es);
}
nth += 1;
}
if let Some(var_param) = subr.var_params.as_ref() {
for var_arg in var_args.iter() {
if let Err(mut es) = self.substitute_var_arg(
&callee,
attr_name,
&var_arg.expr,
nth,
var_param,
) {
errs.append(&mut es);
}
nth += 1;
}
} else {
for (arg, pt) in var_args.iter().zip(subr.default_params.iter()) {
if let Err(mut es) = self.substitute_pos_arg(
&callee,
attr_name,
&arg.expr,
nth,
pt,
&mut passed_params,
) {
errs.append(&mut es);
}
nth += 1;
}
}
for kw_arg in kw_args.iter() {
if let Err(mut es) = self.substitute_kw_arg(
&callee,
attr_name,
kw_arg,
nth,
subr,
&mut passed_params,
) {
errs.append(&mut es);
}
nth += 1;
}
for not_passed in subr
.default_params
.iter()
.filter(|pt| !passed_params.contains(pt.name().unwrap()))
{
if let ParamTy::KwWithDefault { ty, default, .. } = &not_passed {
if let Err(mut es) = self.sub_unify(default, ty, obj, not_passed.name())
{
errs.append(&mut es);
}
}
}
} else {
// pos_args.len() < non_default_params_len
let mut params = non_default_params.chain(subr.default_params.iter());
for pos_arg in pos_args.iter() {
if let Err(mut es) = self.substitute_pos_arg(
&callee,
attr_name,
&pos_arg.expr,
nth,
params.next().unwrap(),
&mut passed_params,
) {
errs.append(&mut es);
}
nth += 1;
}
for kw_arg in kw_args.iter() {
if let Err(mut es) = self.substitute_kw_arg(
&callee,
attr_name,
kw_arg,
nth,
subr,
&mut passed_params,
) {
errs.append(&mut es);
}
nth += 1;
}
let missing_params = subr
.non_default_params
.iter()
.map(|pt| pt.name().cloned().unwrap_or(Str::ever("_")))
.filter(|pt| !passed_params.contains(pt))
.collect::<Vec<_>>();
if !missing_params.is_empty() {
return Err(TyCheckErrors::from(TyCheckError::args_missing_error(
self.cfg.input.clone(),
line!() as usize,
callee.loc(),
&callee.to_string(),
self.caused_by(),
missing_params,
)));
}
}
if errs.is_empty() {
/*if subr.has_qvar() {
panic!("{subr} has qvar");
}*/
Ok(SubstituteResult::Ok)
} else {
Err(errs)
}
}
other => {
if let Ok(typ_ctx) = self.get_singular_ctx_by_hir_expr(obj, &self.name) {
if let Some(call_vi) =
typ_ctx.get_current_scope_var(&VarName::from_static("__call__"))
{
let mut dummy = TyVarCache::new(self.level, self);
let instance =
self.instantiate_t_inner(call_vi.t.clone(), &mut dummy, obj)?;
self.substitute_call(obj, attr_name, &instance, pos_args, kw_args)?;
return Ok(SubstituteResult::__Call__(instance));
}
}
let hint = if other == &ClassType {
Some(switch_lang! {
"japanese" => format!("インスタンスを生成したい場合は、{}.newを使用してください", obj.to_string_notype()),
"simplified_chinese" => format!("如果要生成实例，请使用 {}.new", obj.to_string_notype()),
"traditional_chinese" => format!("如果要生成實例，請使用 {}.new", obj.to_string_notype()),
"english" => format!("If you want to generate an instance, use {}.new", obj.to_string_notype()),
})
} else {
None
};
Err(self.not_callable_error(obj, attr_name, other, hint))
}
}
}
fn gen_too_many_args_error(
&self,
callee: &hir::Expr,
subr_ty: &SubrType,
pos_args: &[hir::PosArg],
kw_args: &[hir::KwArg],
) -> TyCheckErrors {
let mut unknown_args = vec![];
let mut passed_args: Vec<&hir::KwArg> = vec![];
let mut duplicated_args = vec![];
for kw_arg in kw_args.iter() {
if subr_ty
.non_default_params
.iter()
.all(|pt| pt.name() != Some(kw_arg.keyword.inspect()))
&& subr_ty
.var_params
.as_ref()
.map(|pt| pt.name() != Some(kw_arg.keyword.inspect()))
.unwrap_or(true)
&& subr_ty
.default_params
.iter()
.all(|pt| pt.name() != Some(kw_arg.keyword.inspect()))
{
unknown_args.push(kw_arg);
}
if passed_args.iter().any(|a| a.keyword == kw_arg.keyword) {
duplicated_args.push(kw_arg);
} else {
passed_args.push(kw_arg);
}
}
if unknown_args.is_empty() && duplicated_args.is_empty() {
let params_len = subr_ty.non_default_params.len() + subr_ty.default_params.len();
TyCheckErrors::from(TyCheckError::too_many_args_error(
self.cfg.input.clone(),
line!() as usize,
callee.loc(),
&callee.to_string(),
self.caused_by(),
params_len,
pos_args.len(),
kw_args.len(),
))
} else {
let unknown_arg_errors = unknown_args.into_iter().map(|arg| {
TyCheckError::unexpected_kw_arg_error(
self.cfg.input.clone(),
line!() as usize,
arg.loc(),
&callee.to_string(),
self.caused_by(),
arg.keyword.inspect(),
)
});
let duplicated_arg_errors = duplicated_args.into_iter().map(|arg| {
TyCheckError::multiple_args_error(
self.cfg.input.clone(),
line!() as usize,
arg.loc(),
&callee.to_string(),
self.caused_by(),
arg.keyword.inspect(),
)
});
unknown_arg_errors.chain(duplicated_arg_errors).collect()
}
}
fn substitute_pos_arg(
&self,
callee: &hir::Expr,
attr_name: &Option<Identifier>,
arg: &hir::Expr,
nth: usize,
param: &ParamTy,
passed_params: &mut Set<Str>,
) -> TyCheckResult<()> {
let arg_t = arg.ref_t();
let param_t = param.typ();
if let Some(name) = param.name() {
if passed_params.contains(name) {
return Err(TyCheckErrors::from(TyCheckError::multiple_args_error(
self.cfg.input.clone(),
line!() as usize,
callee.loc(),
&callee.to_string(),
self.caused_by(),
name,
)));
} else {
passed_params.insert(name.clone());
}
}
self.sub_unify(arg_t, param_t, arg, param.name())
.map_err(|errs| {
log!(err "semi-unification failed with {callee}\n{arg_t} !<: {param_t}");
let name = if let Some(attr) = attr_name {
format!("{callee}{attr}")
} else {
callee.show_acc().unwrap_or_default()
};
let name = name + "::" + param.name().map(|s| readable_name(&s[..])).unwrap_or("");
let mut hint = self.get_call_type_mismatch_hint(
callee.ref_t(),
attr_name.as_ref().map(|i| &i.inspect()[..]),
nth,
param_t,
arg_t,
);
let param_t = self
.deref_tyvar(param_t.clone(), Variance::Contravariant, &set! {}, arg)
.unwrap_or_else(|_| param_t.clone());
let arg_t = self
.deref_tyvar(arg_t.clone(), Variance::Covariant, &set! {}, arg)
.unwrap_or_else(|_| arg_t.clone());
TyCheckErrors::new(
errs.into_iter()
.map(|e| {
TyCheckError::type_mismatch_error(
self.cfg.input.clone(),
line!() as usize,
e.core.loc,
e.caused_by,
&name[..],
Some(nth),
&param_t,
&arg_t,
self.get_candidates(&arg_t),
std::mem::take(&mut hint),
)
})
.collect(),
)
})?;
Ok(())
}
fn substitute_var_arg(
&self,
callee: &hir::Expr,
attr_name: &Option<Identifier>,
arg: &hir::Expr,
nth: usize,
param: &ParamTy,
) -> TyCheckResult<()> {
let arg_t = arg.ref_t();
let param_t = param.typ();
self.sub_unify(arg_t, param_t, arg, param.name())
.map_err(|errs| {
log!(err "semi-unification failed with {callee}\n{arg_t} !<: {param_t}");
let name = if let Some(attr) = attr_name {
format!("{callee}{attr}")
} else {
callee.show_acc().unwrap_or_default()
};
let name = name + "::" + param.name().map(|s| readable_name(&s[..])).unwrap_or("");
let hint = self.get_simple_type_mismatch_hint(param_t, arg_t);
TyCheckErrors::new(
errs.into_iter()
.map(|e| {
TyCheckError::type_mismatch_error(
self.cfg.input.clone(),
line!() as usize,
e.core.loc,
e.caused_by,
&name[..],
Some(nth),
param_t,
arg_t,
self.get_candidates(arg_t),
hint.clone(),
)
})
.collect(),
)
})
}
fn substitute_kw_arg(
&self,
callee: &hir::Expr,
attr_name: &Option<Identifier>,
arg: &hir::KwArg,
nth: usize,
subr_ty: &SubrType,
passed_params: &mut Set<Str>,
) -> TyCheckResult<()> {
let arg_t = arg.expr.ref_t();
let kw_name = arg.keyword.inspect();
if passed_params.contains(&kw_name[..]) {
return Err(TyCheckErrors::from(TyCheckError::multiple_args_error(
self.cfg.input.clone(),
line!() as usize,
callee.loc(),
&callee.to_string(),
self.caused_by(),
arg.keyword.inspect(),
)));
}
if let Some(pt) = subr_ty
.non_default_params
.iter()
.chain(subr_ty.default_params.iter())
.find(|pt| pt.name().as_ref() == Some(&kw_name))
{
let param_t = pt.typ();
passed_params.insert(kw_name.clone());
self.sub_unify(arg_t, param_t, arg, Some(kw_name))
.map_err(|errs| {
log!(err "semi-unification failed with {callee}\n{arg_t} !<: {}", pt.typ());
let name = if let Some(attr) = attr_name {
format!("{callee}{attr}")
} else {
callee.show_acc().unwrap_or_default()
};
let name = name + "::" + readable_name(kw_name);
let hint = self.get_simple_type_mismatch_hint(param_t, arg_t);
let param_t = self.readable_type(param_t.clone(), true);
let arg_t = self.readable_type(arg_t.clone(), false);
TyCheckErrors::new(
errs.into_iter()
.map(|e| {
TyCheckError::type_mismatch_error(
self.cfg.input.clone(),
line!() as usize,
e.core.loc,
e.caused_by,
&name[..],
Some(nth),
&param_t,
&arg_t,
self.get_candidates(&arg_t),
hint.clone(),
)
})
.collect(),
)
})?;
} else {
return Err(TyCheckErrors::from(TyCheckError::unexpected_kw_arg_error(
self.cfg.input.clone(),
line!() as usize,
arg.keyword.loc(),
&callee.to_string(),
self.caused_by(),
kw_name,
)));
}
Ok(())
}
pub(crate) fn get_call_t(
&self,
obj: &hir::Expr,
attr_name: &Option<Identifier>,
pos_args: &[hir::PosArg],
kw_args: &[hir::KwArg],
input: &Input,
namespace: &Str,
) -> TyCheckResult<VarInfo> {
if let hir::Expr::Accessor(hir::Accessor::Ident(local)) = obj {
if local.vis().is_private() {
match &local.inspect()[..] {
"match" => {
return self.get_match_call_t(SubrKind::Func, pos_args, kw_args);
}
"match!" => {
return self.get_match_call_t(SubrKind::Proc, pos_args, kw_args);
}
_ => {}
}
}
}
let found = self.search_callee_info(obj, attr_name, input, namespace)?;
log!(
"Found:\ncallee: {obj}{}\nfound: {found}",
fmt_option!(pre ".", attr_name.as_ref().map(|ident| &ident.name))
);
let instance = self.instantiate(found.t, obj)?;
log!(
"Instantiated:\ninstance: {instance}\npos_args: ({})\nkw_args: ({})",
fmt_slice(pos_args),
fmt_slice(kw_args)
);
let instance = match self.substitute_call(obj, attr_name, &instance, pos_args, kw_args)? {
SubstituteResult::Ok => instance,
SubstituteResult::__Call__(__call__) => __call__,
SubstituteResult::Coerced(coerced) => coerced,
};
debug_assert!(!instance.is_quantified_subr());
log!(info "Substituted:\ninstance: {instance}");
let res = self.eval_t_params(instance, self.level, obj)?;
log!(info "Params evaluated:\nres: {res}\n");
self.propagate(&res, obj)?;
log!(info "Propagated:\nres: {res}\n");
let res = VarInfo { t: res, ..found };
Ok(res)
}
pub(crate) fn get_const_local(
&self,
name: &Token,
namespace: &Str,
) -> SingleTyCheckResult<ValueObj> {
if let Some(obj) = self.consts.get(name.inspect()) {
Ok(obj.clone())
} else {
/*if let Some(parent) = self.get_outer().or_else(|| self.get_builtins()) {
return parent.get_const_local(name, namespace);
}*/
Err(TyCheckError::no_var_error(
self.cfg.input.clone(),
line!() as usize,
name.loc(),
namespace.into(),
name.inspect(),
self.get_similar_name(name.inspect()),
))
}
}
pub(crate) fn _get_const_attr(
&self,
obj: &hir::Expr,
name: &Token,
namespace: &Str,
) -> SingleTyCheckResult<ValueObj> {
let self_t = obj.ref_t();
for ctx in self.get_nominal_super_type_ctxs(self_t).ok_or_else(|| {
TyCheckError::type_not_found(
self.cfg.input.clone(),
line!() as usize,
obj.loc(),
self.caused_by(),
self_t,
)
})? {
if let Ok(t) = ctx.get_const_local(name, namespace) {
return Ok(t);
}
}
// TODO: dependent type widening
if let Some(parent) = self.get_outer().or_else(|| self.get_builtins()) {
parent._get_const_attr(obj, name, namespace)
} else {
Err(TyCheckError::no_attr_error(
self.cfg.input.clone(),
line!() as usize,
name.loc(),
namespace.into(),
self_t,
name.inspect(),
self.get_similar_attr(self_t, name.inspect()),
))
}
}
pub(crate) fn get_similar_name(&self, name: &str) -> Option<&str> {
get_similar_name(
self.dir().into_iter().map(|(vn, _)| &vn.inspect()[..]),
name,
)
}
pub(crate) fn get_similar_attr_from_singular<'a>(
&'a self,
obj: &hir::Expr,
name: &str,
) -> Option<&'a str> {
if let Ok(ctx) = self.get_singular_ctx_by_hir_expr(obj, &self.name) {
if let Some(name) = ctx.get_similar_name(name) {
return Some(name);
}
}
None
}
pub(crate) fn get_similar_attr<'a>(&'a self, self_t: &'a Type, name: &str) -> Option<&'a str> {
for ctx in self.get_nominal_super_type_ctxs(self_t)? {
if let Some(name) = ctx.get_similar_name(name) {
return Some(name);
}
}
None
}
// Returns what kind of variance the type has for each parameter Type.
// Invariant for types not specified
// selfが示す型が、各パラメータTypeに対してどのような変性Varianceを持つかを返す
// 特に指定されない型に対してはInvariant
// e.g. K(T, U) = Class(..., Impl: F(T) and Output(U) and Input(T))
// -> K.variance() == vec![Contravariant, Covariant]
// TODO: support keyword arguments
pub(crate) fn type_params_variance(&self) -> Vec<Variance> {
let match_tp_name = |tp: &TyParam, name: &VarName| -> bool {
tp.qual_name().as_ref() == Some(name.inspect())
};
let in_inout = |t: &Type, name: &VarName| {
(&t.qual_name()[..] == "Input" || &t.qual_name()[..] == "Output")
&& t.typarams()
.first()
.map(|inner| match_tp_name(inner, name))
.unwrap_or(false)
};
self.params
.iter()
.map(|(opt_name, _)| {
if let Some(name) = opt_name {
// トレイトの変性を調べるときはsuper_classesも見る必要がある
if let Some(variance_trait) = self
.super_traits
.iter()
.chain(self.super_classes.iter())
.find(|t| in_inout(t, name))
{
match &variance_trait.qual_name()[..] {
"Output" => Variance::Covariant,
"Input" => Variance::Contravariant,
_ => unreachable!(),
}
} else {
Variance::Invariant
}
} else {
Variance::Invariant
}
})
.collect()
}
/// Perform types linearization.
/// TODO: Current implementation may be very inefficient.
///
/// C3 linearization requires prior knowledge of inter-type dependencies, and cannot be used for Erg structural subtype linearization
///
/// Algorithm:
/// ```python
/// [Int, Str, Nat, Never, Obj, Str!, Module]
/// => [], [Int, Str, Nat, Never, Obj, Str!, Module]
/// => [[Int]], [Str, Nat, Never, Obj, Str!, Module]
/// # 1. If related, put them in the same array; if not, put them in different arrays.
/// => [[Int], [Str]], [Nat, Never, Obj, Str!, Module]
/// => ...
/// => [[Int, Nat, Never, Obj]], [Str, Str!], [Module]]
/// # 2. Then, perform sorting on the arrays
/// => [[Never, Nat, Int, Obj], [Str!, Str], [Module]]
/// # 3. Concatenate the arrays
/// => [Never, Nat, Int, Obj, Str!, Str, Module]
/// # 4. From the left, "slide" types as far as it can.
/// => [Never, Nat, Int, Str!, Str, Module, Obj]
/// ```
pub fn sort_types<'a>(&self, types: impl Iterator<Item = &'a Type>) -> Vec<&'a Type> {
let allow_cast = true;
let mut buffers: Vec<Vec<&Type>> = vec![];
for t in types {
let mut found = false;
for buf in buffers.iter_mut() {
if buf
.iter()
.all(|buf_inner| self.related(buf_inner, t, allow_cast))
{
found = true;
buf.push(t);
break;
}
}
if !found {
buffers.push(vec![t]);
}
}
for buf in buffers.iter_mut() {
// this unwrap should be safe
buf.sort_by(|lhs, rhs| self.cmp_t(lhs, rhs).try_into().unwrap());
}
let mut concatenated = buffers.into_iter().flatten().collect::<Vec<_>>();
let mut idx = 0;
let len = concatenated.len();
while let Some(maybe_sup) = concatenated.get(idx) {
if let Some(pos) = concatenated
.iter()
.take(len - idx - 1)
.rposition(|t| self.supertype_of(maybe_sup, t, allow_cast))
{
let sup = concatenated.remove(idx);
concatenated.insert(pos, sup); // not `pos + 1` because the element was removed at idx
}
idx += 1;
}
concatenated
}
pub fn get_nominal_super_type_ctxs<'a>(&'a self, t: &Type) -> Option<Vec<&'a Context>> {
match t {
Type::FreeVar(fv) if fv.is_linked() => self.get_nominal_super_type_ctxs(&fv.crack()),
Type::FreeVar(fv) => {
if let Some(sup) = fv.get_super() {
self.get_nominal_super_type_ctxs(&sup)
} else {
self.get_nominal_super_type_ctxs(&Type)
}
}
Type::And(l, r) => {
match (
self.get_nominal_super_type_ctxs(l),
self.get_nominal_super_type_ctxs(r),
) {
// TODO: sort
(Some(l), Some(r)) => Some([l, r].concat()),
(Some(l), None) => Some(l),
(None, Some(r)) => Some(r),
(None, None) => None,
}
}
// TODO
Type::Or(l, r) => match (l.as_ref(), r.as_ref()) {
(Type::FreeVar(l), Type::FreeVar(r)) if l.is_unbound() && r.is_unbound() => {
let (_lsub, lsup) = l.get_subsup().unwrap();
let (_rsub, rsup) = r.get_subsup().unwrap();
self.get_nominal_super_type_ctxs(&self.union(&lsup, &rsup))
}
(Type::Refinement(l), Type::Refinement(r)) if l.t == r.t => {
self.get_nominal_super_type_ctxs(&l.t)
}
_ => None,
},
_ => self
.get_simple_nominal_super_type_ctxs(t)
.map(|ctxs| ctxs.collect()),
}
}
/// include `t` itself
fn get_simple_nominal_super_type_ctxs<'a>(
&'a self,
t: &Type,
) -> Option<impl Iterator<Item = &'a Context>> {
let (_, ctx) = self.get_nominal_type_ctx(t)?;
let sups = ctx
.super_classes
.iter()
.chain(ctx.super_traits.iter())
.map(|sup| {
self.get_nominal_type_ctx(sup)
.unwrap_or_else(|| todo!("compiler bug: {sup} not found"))
.1
});
Some(vec![ctx].into_iter().chain(sups))
}
pub(crate) fn _get_super_traits(&self, typ: &Type) -> Option<impl Iterator<Item = Type>> {
self.get_nominal_type_ctx(typ)
.map(|(_, ctx)| ctx.super_traits.clone().into_iter())
}
/// include `typ` itself.
/// if `typ` is a refinement type, include the base type (refine.t)
pub(crate) fn _get_super_classes(&self, typ: &Type) -> Option<impl Iterator<Item = Type>> {
self.get_nominal_type_ctx(typ).map(|(t, ctx)| {
let super_classes = ctx.super_classes.clone();
let derefined = typ.derefine();
if typ != &derefined {
vec![t.clone(), derefined].into_iter().chain(super_classes)
} else {
vec![t.clone()].into_iter().chain(super_classes)
}
})
}
// TODO: Never
pub(crate) fn get_nominal_type_ctx<'a>(
&'a self,
typ: &Type,
) -> Option<(&'a Type, &'a Context)> {
let allow_cast = true;
match typ {
Type::FreeVar(fv) if fv.is_linked() => {
if let Some(res) = self.get_nominal_type_ctx(&fv.crack()) {
return Some(res);
}
}
Type::FreeVar(fv) => {
let sup = fv.get_super().unwrap();
if let Some(res) = self.get_nominal_type_ctx(&sup) {
return Some(res);
}
}
Type::Refinement(refine) => {
if let Some(res) = self.get_nominal_type_ctx(&refine.t) {
return Some(res);
}
}
Type::Quantified(_) => {
if let Some((t, ctx)) = self
.get_builtins()
.unwrap_or(self)
.rec_get_mono_type("QuantifiedFunc")
{
return Some((t, ctx));
}
}
Type::Subr(subr) => match subr.kind {
SubrKind::Func => {
if let Some((t, ctx)) = self
.get_builtins()
.unwrap_or(self)
.rec_get_mono_type("Func")
{
return Some((t, ctx));
}
}
SubrKind::Proc => {
if let Some((t, ctx)) = self
.get_builtins()
.unwrap_or(self)
.rec_get_mono_type("Proc")
{
return Some((t, ctx));
}
}
},
Type::Mono(name) => {
if let Some((t, ctx)) = self.rec_get_mono_type(&typ.local_name()) {
return Some((t, ctx));
}
// e.g. http.client.Response -> http.client
let mut namespaces = name.split_with(&[".", "::"]);
if namespaces.len() < 2 {
return None;
}
let type_name = namespaces.pop().unwrap(); // Response
let path = Path::new(namespaces.remove(0));
let mut path = Self::resolve_path(&self.cfg, path)?;
for p in namespaces.into_iter() {
path = self.push_path(path, Path::new(p));
}
if let Some(ctx) = self.get_ctx_from_path(path.as_path()) {
if let Some((t, ctx)) = ctx.rec_get_mono_type(type_name) {
return Some((t, ctx));
}
}
}
Type::Poly { name, .. } => {
if let Some((t, ctx)) = self.rec_get_poly_type(&typ.local_name()) {
return Some((t, ctx));
}
// NOTE: This needs to be changed if we want to be able to define classes/traits outside of the top level
let mut namespaces = name.split_with(&[".", "::"]);
if namespaces.len() < 2 {
return None;
}
let type_name = namespaces.pop().unwrap(); // Response
let path = Path::new(namespaces.remove(0));
let mut path = Self::resolve_path(&self.cfg, path)?;
for p in namespaces.into_iter() {
path = self.push_path(path, Path::new(p));
}
if let Some(ctx) = self.get_ctx_from_path(path.as_path()) {
if let Some((t, ctx)) = ctx.rec_get_poly_type(type_name) {
return Some((t, ctx));
}
}
}
Type::Record(rec)
if rec
.values()
.all(|attr| self.supertype_of(&Type, attr, allow_cast)) =>
{
return self
.get_builtins()
.unwrap_or(self)
.rec_get_mono_type("RecordType");
}
Type::Record(_) => {
return self
.get_builtins()
.unwrap_or(self)
.rec_get_mono_type("Record");
}
Type::Or(_l, _r) => {
if let Some(ctx) = self.get_nominal_type_ctx(&poly("Or", vec![])) {
return Some(ctx);
}
}
// FIXME: `F()`などの場合、実際は引数が省略されていてもmonomorphicになる
other if other.is_monomorphic() => {
if let Some((t, ctx)) = self.rec_get_mono_type(&other.local_name()) {
return Some((t, ctx));
}
}
Type::Ref(t) | Type::RefMut { before: t, .. } => {
if let Some(res) = self.get_nominal_type_ctx(t) {
return Some(res);
}
}
other => {
log!("{other} has no nominal definition");
}
}
None
}
// TODO: Never
pub(crate) fn get_mut_nominal_type_ctx<'a>(
&'a mut self,
typ: &Type,
) -> Option<(&'a Type, &'a mut Context)> {
match typ {
Type::FreeVar(fv) if fv.is_linked() => {
if let Some(res) = self.get_mut_nominal_type_ctx(&fv.crack()) {
return Some(res);
}
}
Type::FreeVar(fv) => {
let sup = fv.get_super().unwrap();
if let Some(res) = self.get_mut_nominal_type_ctx(&sup) {
return Some(res);
}
}
Type::Refinement(refine) => {
if let Some(res) = self.get_mut_nominal_type_ctx(&refine.t) {
return Some(res);
}
}
Type::Quantified(_) => {
if let Some(res) = self.get_mut_nominal_type_ctx(&mono("QuantifiedFunc")) {
return Some(res);
}
}
Type::Mono(_) => {
if let Some((t, ctx)) = self.rec_get_mut_mono_type(&typ.local_name()) {
return Some((t, ctx));
}
}
Type::Poly { .. } => {
if let Some((t, ctx)) = self.rec_get_mut_poly_type(&typ.local_name()) {
return Some((t, ctx));
}
}
// FIXME: `F()`などの場合、実際は引数が省略されていてもmonomorphicになる
other if other.is_monomorphic() => {
if let Some((t, ctx)) = self.rec_get_mut_mono_type(&other.local_name()) {
return Some((t, ctx));
}
}
Type::Ref(t) | Type::RefMut { before: t, .. } => {
if let Some(res) = self.get_mut_nominal_type_ctx(t) {
return Some(res);
}
}
other => {
log!("{other} has no nominal definition");
}
}
None
}
pub(crate) fn get_trait_impls(&self, trait_: &Type) -> Set<TraitImpl> {
match trait_ {
// And(Add, Sub) == intersection({Int <: Add(Int), Bool <: Add(Bool) ...}, {Int <: Sub(Int), ...})
// == {Int <: Add(Int) and Sub(Int), ...}
Type::And(l, r) => {
let l_impls = self.get_trait_impls(l);
let l_base = Set::from_iter(l_impls.iter().map(|ti| &ti.sub_type));
let r_impls = self.get_trait_impls(r);
let r_base = Set::from_iter(r_impls.iter().map(|ti| &ti.sub_type));
let bases = l_base.intersection(&r_base);
let mut isec = set! {};
for base in bases.into_iter() {
let lti = l_impls.iter().find(|ti| &ti.sub_type == base).unwrap();
let rti = r_impls.iter().find(|ti| &ti.sub_type == base).unwrap();
let sup_trait = self.intersection(&lti.sup_trait, &rti.sup_trait);
isec.insert(TraitImpl::new(lti.sub_type.clone(), sup_trait));
}
isec
}
Type::Or(l, r) => {
let l_impls = self.get_trait_impls(l);
let r_impls = self.get_trait_impls(r);
// FIXME:
l_impls.union(&r_impls)
}
_ => self.get_simple_trait_impls(trait_),
}
}
pub(crate) fn get_simple_trait_impls(&self, trait_: &Type) -> Set<TraitImpl> {
let current = if let Some(impls) = self.trait_impls().get(&trait_.qual_name()) {
impls.clone()
} else {
set! {}
};
if let Some(outer) = self.get_outer().or_else(|| self.get_builtins()) {
current.union(&outer.get_simple_trait_impls(trait_))
} else {
current
}
}
pub(crate) fn all_patches(&self) -> Vec<&Context> {
if let Some(outer) = self.get_outer().or_else(|| self.get_builtins()) {
[outer.all_patches(), self.patches.values().collect()].concat()
} else {
self.patches.values().collect()
}
}
pub(crate) fn resolve_path(cfg: &ErgConfig, path: &Path) -> Option<PathBuf> {
Self::resolve_real_path(cfg, path).or_else(|| Self::resolve_decl_path(cfg, path))
}
pub(crate) fn resolve_real_path(cfg: &ErgConfig, path: &Path) -> Option<PathBuf> {
if let Ok(path) = cfg.input.local_resolve(path) {
Some(path)
} else if let Ok(path) = erg_std_path()
.join(format!("{}.er", path.display()))
.canonicalize()
{
Some(normalize_path(path))
} else if let Ok(path) = erg_std_path()
.join(format!("{}", path.display()))
.join("__init__.er")
.canonicalize()
{
Some(normalize_path(path))
} else {
None
}
}
pub(crate) fn resolve_decl_path(cfg: &ErgConfig, path: &Path) -> Option<PathBuf> {
if let Ok(path) = cfg.input.local_resolve(path) {
Some(path)
} else if let Ok(path) = erg_pystd_path()
.join(format!("{}.d.er", path.display()))
.canonicalize()
{
Some(normalize_path(path))
} else if let Ok(path) = erg_pystd_path()
.join(format!("{}.d", path.display()))
.join("__init__.d.er")
.canonicalize()
{
Some(normalize_path(path))
} else {
None
}
}
pub(crate) fn push_path(&self, mut path: PathBuf, add: &Path) -> PathBuf {
path.pop(); // __init__.d.er
if let Ok(path) = path.join(add).canonicalize() {
normalize_path(path)
} else if let Ok(path) = path.join(format!("{}.d.er", add.display())).canonicalize() {
normalize_path(path)
} else if let Ok(path) = path
.join(format!("{}.d", add.display()))
.join("__init__.d.er")
.canonicalize()
{
normalize_path(path)
} else {
todo!("{} {}", path.display(), add.display())
}
}
// FIXME: 現在の実装だとimportしたモジュールはどこからでも見れる
pub(crate) fn get_mod(&self, name: &str) -> Option<&Context> {
let t = self.get_var_info(name).map(|(_, vi)| vi.t.clone())?;
if t.is_module() {
let path =
option_enum_unwrap!(t.typarams().remove(0), TyParam::Value:(ValueObj::Str:(_)))?;
let path = Self::resolve_path(&self.cfg, Path::new(&path[..]))?;
self.get_ctx_from_path(path.as_path())
} else {
None
}
}
// rec_get_const_localとは違い、位置情報を持たないしエラーとならない
pub(crate) fn rec_get_const_obj(&self, name: &str) -> Option<&ValueObj> {
if let Some(val) = self.consts.get(name) {
return Some(val);
}
for (_, ctx) in self.methods_list.iter() {
if let Some(val) = ctx.consts.get(name) {
return Some(val);
}
}
if let Some(outer) = self.get_outer().or_else(|| self.get_builtins()) {
outer.rec_get_const_obj(name)
} else {
None
}
}
pub(crate) fn _rec_get_const_param_defaults(&self, name: &str) -> Option<&Vec<ConstTemplate>> {
if let Some(impls) = self.const_param_defaults.get(name) {
Some(impls)
} else if let Some(outer) = self.get_outer().or_else(|| self.get_builtins()) {
outer._rec_get_const_param_defaults(name)
} else {
None
}
}
// TODO: poly type
pub(crate) fn rec_get_self_t(&self) -> Option<Type> {
if self.kind.is_method_def() || self.kind.is_type() {
Some(mono(self.name.clone()))
} else if let ContextKind::PatchMethodDefs(t) = &self.kind {
Some(t.clone())
} else if let Some(outer) = self.get_outer() {
outer.rec_get_self_t()
} else {
None
}
}
pub(crate) fn rec_get_mono_type(&self, name: &str) -> Option<(&Type, &Context)> {
if let Some((t, ctx)) = self.mono_types.get(name) {
Some((t, ctx))
} else if let Some(outer) = self.get_outer().or_else(|| self.get_builtins()) {
outer.rec_get_mono_type(name)
} else {
None
}
}
pub(crate) fn rec_get_poly_type(&self, name: &str) -> Option<(&Type, &Context)> {
if let Some((t, ctx)) = self.poly_types.get(name) {
Some((t, ctx))
} else if let Some(outer) = self.get_outer().or_else(|| self.get_builtins()) {
outer.rec_get_poly_type(name)
} else {
None
}
}
fn rec_get_mut_mono_type(&mut self, name: &str) -> Option<(&mut Type, &mut Context)> {
if let Some((t, ctx)) = self.mono_types.get_mut(name) {
Some((t, ctx))
} else if let Some(outer) = self.outer.as_mut() {
// builtins cannot be got as mutable
outer.rec_get_mut_mono_type(name)
} else {
None
}
}
fn rec_get_mut_poly_type(&mut self, name: &str) -> Option<(&mut Type, &mut Context)> {
if let Some((t, ctx)) = self.poly_types.get_mut(name) {
Some((t, ctx))
} else if let Some(outer) = self.outer.as_mut() {
outer.rec_get_mut_poly_type(name)
} else {
None
}
}
pub(crate) fn rec_get_type(&self, name: &str) -> Option<(&Type, &Context)> {
if let Some((t, ctx)) = self.mono_types.get(name) {
Some((t, ctx))
} else if let Some((t, ctx)) = self.poly_types.get(name) {
Some((t, ctx))
} else if let Some(outer) = self.get_outer().or_else(|| self.get_builtins()) {
outer.rec_get_type(name)
} else {
None
}
}
pub(crate) fn get_mut_type(&mut self, name: &str) -> Option<(&Type, &mut Context)> {
if let Some((t, ctx)) = self.mono_types.get_mut(name) {
Some((t, ctx))
} else if let Some((t, ctx)) = self.poly_types.get_mut(name) {
Some((t, ctx))
} else {
None
}
}
pub(crate) fn rec_get_patch(&self, name: &str) -> Option<&Context> {
if let Some(ctx) = self.patches.get(name) {
Some(ctx)
} else if let Some(outer) = self.get_outer().or_else(|| self.get_builtins()) {
outer.rec_get_patch(name)
} else {
None
}
}
fn get_method_type_by_name(&self, name: &Identifier) -> SingleTyCheckResult<&MethodInfo> {
// TODO: min_by
if let Some(candidates) = self.method_to_traits.get(name.inspect()) {
let first_method_type = &candidates.first().unwrap().method_type;
if candidates
.iter()
.skip(1)
.all(|t| &t.method_type == first_method_type)
{
return Ok(&candidates[0]);
} else {
return Err(TyCheckError::ambiguous_type_error(
self.cfg.input.clone(),
line!() as usize,
name,
&candidates
.iter()
.map(|t| t.definition_type.clone())
.collect::<Vec<_>>(),
self.caused_by(),
));
}
}
if let Some(candidates) = self.method_to_classes.get(name.inspect()) {
let first_method_type = &candidates.first().unwrap().method_type;
if candidates
.iter()
.skip(1)
.all(|t| &t.method_type == first_method_type)
{
return Ok(&candidates[0]);
} else {
return Err(TyCheckError::ambiguous_type_error(
self.cfg.input.clone(),
line!() as usize,
name,
&candidates
.iter()
.map(|t| t.definition_type.clone())
.collect::<Vec<_>>(),
self.caused_by(),
));
}
}
if let Some(outer) = self.get_outer().or_else(|| self.get_builtins()) {
outer.get_method_type_by_name(name)
} else {
Err(TyCheckError::no_attr_error(
self.cfg.input.clone(),
line!() as usize,
name.loc(),
self.caused_by(),
&Type::Failure,
name.inspect(),
None,
))
}
}
fn get_gen_t_require_attr_t<'a>(&'a self, gen: &'a GenTypeObj, attr: &str) -> Option<&'a Type> {
match gen.base_or_sup().map(|req_sup| req_sup.typ()) {
Some(Type::Record(rec)) => {
if let Some(t) = rec.get(attr) {
return Some(t);
}
}
Some(other) => {
let obj = self.rec_get_const_obj(&other.local_name());
let obj = option_enum_unwrap!(obj, Some:(ValueObj::Type:(TypeObj::Generated:(_))))?;
if let Some(t) = self.get_gen_t_require_attr_t(obj, attr) {
return Some(t);
}
}
None => {}
}
if let Some(additional) = gen.additional() {
if let Type::Record(gen) = additional.typ() {
if let Some(t) = gen.get(attr) {
return Some(t);
}
}
}
None
}
// TODO: params, polymorphic types
pub(crate) fn get_candidates(&self, t: &Type) -> Option<Set<Type>> {
match t {
Type::Proj { lhs, rhs } => Some(self.get_proj_candidates(lhs, rhs)),
Type::Subr(subr) => {
let candidates = self.get_candidates(&subr.return_t)?;
Some(
candidates
.into_iter()
.map(|ret_t| {
let subr = SubrType::new(
subr.kind,
subr.non_default_params.clone(),
subr.var_params.as_ref().map(|p| *p.clone()),
subr.default_params.clone(),
ret_t,
);
Type::Subr(subr)
})
.collect(),
)
}
_ => None,
}
}
fn get_proj_candidates(&self, lhs: &Type, rhs: &Str) -> Set<Type> {
#[allow(clippy::single_match)]
match lhs {
Type::FreeVar(fv) => {
if let Some(sup) = fv.get_super() {
if self.is_trait(&sup) {
return self.get_trait_proj_candidates(&sup, rhs);
} else {
return self
.eval_proj(sup, rhs.clone(), self.level, &())
.map_or(set! {}, |t| set! {t});
}
}
}
_ => {}
}
set! {}
}
fn get_trait_proj_candidates(&self, trait_: &Type, rhs: &Str) -> Set<Type> {
let allow_cast = true;
let impls = self.get_trait_impls(trait_);
let candidates = impls.into_iter().filter_map(move |inst| {
if self.supertype_of(&inst.sup_trait, trait_, allow_cast) {
self.eval_t_params(proj(inst.sub_type, rhs), self.level, &())
.ok()
} else {
None
}
});
candidates.collect()
}
pub(crate) fn is_class(&self, typ: &Type) -> bool {
match typ {
Type::And(_l, _r) => false,
Type::Never => true,
Type::FreeVar(fv) if fv.is_linked() => self.is_class(&fv.crack()),
Type::FreeVar(_) => false,
Type::Or(l, r) => self.is_class(l) && self.is_class(r),
Type::Proj { lhs, rhs } => self
.get_proj_candidates(lhs, rhs)
.iter()
.all(|t| self.is_class(t)),
Type::Refinement(refine) => self.is_class(&refine.t),
Type::Ref(t) | Type::RefMut { before: t, .. } => self.is_class(t),
_ => {
if let Some((_, ctx)) = self.get_nominal_type_ctx(typ) {
ctx.kind.is_class()
} else {
// TODO: unknown types
false
}
}
}
}
pub(crate) fn is_trait(&self, typ: &Type) -> bool {
match typ {
Type::Never => false,
Type::FreeVar(fv) if fv.is_linked() => self.is_class(&fv.crack()),
Type::FreeVar(_) => false,
Type::And(l, r) | Type::Or(l, r) => self.is_trait(l) && self.is_trait(r),
Type::Proj { lhs, rhs } => self
.get_proj_candidates(lhs, rhs)
.iter()
.all(|t| self.is_trait(t)),
Type::Refinement(refine) => self.is_trait(&refine.t),
Type::Ref(t) | Type::RefMut { before: t, .. } => self.is_trait(t),
_ => {
if let Some((_, ctx)) = self.get_nominal_type_ctx(typ) {
ctx.kind.is_trait()
} else {
false
}
}
}
}
// TODO:
/// Int.meta_type() == ClassType (<: Type)
/// Show.meta_type() == TraitType (<: Type)
/// [Int; 3].meta_type() == [ClassType; 3] (<: Type)
pub fn meta_type(&self, typ: &Type) -> Type {
match typ {
Type::Poly { name, params } => poly(
name.clone(),
params
.iter()
.map(|tp| {
if let Ok(t) = self.convert_tp_into_ty(tp.clone()) {
TyParam::t(self.meta_type(&t))
} else {
tp.clone()
}
})
.collect(),
),
_ => Type,
}
}
}
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