QPQ-AG/sophia
10
0
Fork 0
Code Issues 41 Pull Requests 5 Actions Packages Projects Releases 16 Wiki Activity

Make is_subtype/4 a separate function

Browse Source
This commit is contained in:
Gaith Hallak 2022-02-24 16:03:47 +04:00
parent b9af3dbe7f
commit ae9b8f8b16
1 changed files with 12 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
src/aeso_ast_infer_types.erl
View File

@ -2747,16 +2747,9 @@ unify1(_Env, X, X, _Variance, _When) ->
unify1(_Env, {id, _, Name}, {id, _, Name}, _Variance, _When) ->
true;
unify1(Env, A = {con, _, NameA}, B = {con, _, NameB}, Variance, When) ->
IsSubtype = case Variance of
invariant -> NameA == NameB;
covariant -> is_subtype(Env, NameA, NameB);
contravariant -> is_subtype(Env, NameB, NameA);
bivariant -> is_subtype(Env, NameA, NameB)
end,
if
IsSubtype ->
true;
true ->
case is_subtype(Env, NameA, NameB, Variance) of
true -> true;
false ->
cannot_unify(A, B, When),
false
end;
@ -2803,6 +2796,15 @@ unify1(_Env, A, B, _Variance, When) ->
cannot_unify(A, B, When),
false.
is_subtype(Env, NameA, NameB, invariant) ->
NameA == NameB;
is_subtype(Env, NameA, NameB, covariant) ->
is_subtype(Env, NameA, NameB);
is_subtype(Env, NameA, NameB, contravariant) ->
is_subtype(Env, NameB, NameA);
is_subtype(Env, NameA, NameB, bivariant) ->
is_subtype(Env, NameA, NameB) orelse is_subtype(Env, NameB, NameA).
is_subtype(Env, Child, Base) ->
Parents = maps:get(Child, Env#env.contract_parents, []),
if