diff options
| -rw-r--r-- | lib/stdlib/src/erl_lint.erl | 93 |
1 files changed, 40 insertions, 53 deletions
diff --git a/lib/stdlib/src/erl_lint.erl b/lib/stdlib/src/erl_lint.erl index 39cc03cf7a..88a09ee0a6 100644 --- a/lib/stdlib/src/erl_lint.erl +++ b/lib/stdlib/src/erl_lint.erl @@ -237,10 +237,7 @@ format_error({too_many_arguments,Arity}) -> "maximum allowed is ~w", [Arity,?MAX_ARGUMENTS]); %% --- patterns and guards --- format_error(illegal_pattern) -> "illegal pattern"; -format_error(illegal_map_key) -> - "illegal map key"; -format_error({illegal_map_key_variable,K}) -> - io_lib:format("illegal use of variable ~w in map",[K]); +format_error(illegal_map_key) -> "illegal map key in pattern"; format_error(illegal_bin_pattern) -> "binary patterns cannot be matched in parallel using '='"; format_error(illegal_expr) -> "illegal expression"; @@ -1404,20 +1401,7 @@ pattern({cons,_Line,H,T}, Vt, Old, Bvt, St0) -> pattern({tuple,_Line,Ps}, Vt, Old, Bvt, St) -> pattern_list(Ps, Vt, Old, Bvt, St); pattern({map,_Line,Ps}, Vt, Old, Bvt, St) -> - foldl(fun - ({map_field_assoc,L,_,_}, {Psvt,Bvt0,St0}) -> - {Psvt,Bvt0,add_error(L, illegal_pattern, St0)}; - ({map_field_exact,L,KP,VP}, {Psvt,Bvt0,St0}) -> - case is_valid_map_key(KP, pattern, St0) of - true -> - {Pvt,Bvt1,St1} = pattern(VP, Vt, Old, Bvt, St0), - {vtmerge_pat(Pvt, Psvt),vtmerge_pat(Bvt0, Bvt1), St1}; - false -> - {Psvt,Bvt0,add_error(L, illegal_map_key, St0)}; - {false,variable,Var} -> - {Psvt,Bvt0,add_error(L, {illegal_map_key_variable,Var}, St0)} - end - end, {[],[],St}, Ps); + pattern_map(Ps, Vt, Old, Bvt, St); %%pattern({struct,_Line,_Tag,Ps}, Vt, Old, Bvt, St) -> %% pattern_list(Ps, Vt, Old, Bvt, St); pattern({record_index,Line,Name,Field}, _Vt, _Old, _Bvt, St) -> @@ -1571,6 +1555,21 @@ is_pattern_expr_1({op,_Line,Op,A1,A2}) -> erl_internal:arith_op(Op, 2) andalso all(fun is_pattern_expr/1, [A1,A2]); is_pattern_expr_1(_Other) -> false. +pattern_map(Ps, Vt, Old, Bvt, St) -> + foldl(fun + ({map_field_assoc,L,_,_}, {Psvt,Bvt0,St0}) -> + {Psvt,Bvt0,add_error(L, illegal_pattern, St0)}; + ({map_field_exact,L,K,V}, {Psvt,Bvt0,St0}) -> + case is_valid_map_key(K) of + true -> + {Kvt,St1} = expr(K, Vt, St0), + {Vvt,Bvt2,St2} = pattern(V, Vt, Old, Bvt, St1), + {vtmerge_pat(vtmerge_pat(Kvt, Vvt), Psvt), vtmerge_pat(Bvt0, Bvt2), St2}; + false -> + {Psvt,Bvt0,add_error(L, illegal_map_key, St0)} + end + end, {[],[],St}, Ps). + %% pattern_bin([Element], VarTable, Old, BinVarTable, State) -> %% {UpdVarTable,UpdBinVarTable,State}. %% Check a pattern group. BinVarTable are used binsize variables. @@ -2254,14 +2253,9 @@ check_assoc_fields([{map_field_assoc,_,_,_}|Fs], St) -> check_assoc_fields([], St) -> St. -map_fields([{Tag,Line,K,V}|Fs], Vt, St, F) when Tag =:= map_field_assoc; - Tag =:= map_field_exact -> - St1 = case is_valid_map_key(K, St) of - true -> St; - false -> add_error(Line, illegal_map_key, St); - {false,variable,Var} -> add_error(Line, {illegal_map_key_variable,Var}, St) - end, - {Pvt,St2} = F([K,V], Vt, St1), +map_fields([{Tag,_,K,V}|Fs], Vt, St, F) when Tag =:= map_field_assoc; + Tag =:= map_field_exact -> + {Pvt,St2} = F([K,V], Vt, St), {Vts,St3} = map_fields(Fs, Vt, St2, F), {vtupdate(Pvt, Vts),St3}; map_fields([], Vt, St, _) -> @@ -2319,21 +2313,14 @@ is_valid_call(Call) -> _ -> true end. -%% is_valid_map_key(K,St) -> true | false | {false, Var::atom()} -%% check for value expression without variables - -is_valid_map_key(K,St) -> - is_valid_map_key(K,expr,St). -is_valid_map_key(K,Ctx,St) -> - case expr(K,[],St) of - {[],_} -> - is_valid_map_key_value(K,Ctx); - {[Var|_],_} -> - {false,variable,element(1,Var)} - end. +%% is_valid_map_key(K,St) -> true | false +%% variables are allowed for patterns only at the top of the tree -is_valid_map_key_value(K,Ctx) -> +is_valid_map_key({var,_,_}) -> true; +is_valid_map_key(K) -> is_valid_map_key_value(K). +is_valid_map_key_value(K) -> case K of + {var,_,_} -> false; {char,_,_} -> true; {integer,_,_} -> true; {float,_,_} -> true; @@ -2341,36 +2328,36 @@ is_valid_map_key_value(K,Ctx) -> {nil,_} -> true; {atom,_,_} -> true; {cons,_,H,T} -> - is_valid_map_key_value(H,Ctx) andalso - is_valid_map_key_value(T,Ctx); + is_valid_map_key_value(H) andalso + is_valid_map_key_value(T); {tuple,_,Es} -> foldl(fun(E,B) -> - B andalso is_valid_map_key_value(E,Ctx) + B andalso is_valid_map_key_value(E) end,true,Es); {map,_,Arg,Ps} -> % only check for value expressions to be valid % invalid map expressions are later checked in % core and kernel - is_valid_map_key_value(Arg,Ctx) andalso foldl(fun + is_valid_map_key_value(Arg) andalso foldl(fun ({Tag,_,Ke,Ve},B) when Tag =:= map_field_assoc; - Tag =:= map_field_exact, Ctx =:= expr -> - B andalso is_valid_map_key_value(Ke,Ctx) - andalso is_valid_map_key_value(Ve,Ctx); + Tag =:= map_field_exact -> + B andalso is_valid_map_key_value(Ke) + andalso is_valid_map_key_value(Ve); (_,_) -> false end,true,Ps); {map,_,Ps} -> foldl(fun ({Tag,_,Ke,Ve},B) when Tag =:= map_field_assoc; - Tag =:= map_field_exact, Ctx =:= expr -> - B andalso is_valid_map_key_value(Ke,Ctx) - andalso is_valid_map_key_value(Ve,Ctx); + Tag =:= map_field_exact -> + B andalso is_valid_map_key_value(Ke) + andalso is_valid_map_key_value(Ve); (_,_) -> false end, true, Ps); {record,_,_,Fs} -> foldl(fun ({record_field,_,Ke,Ve},B) -> - B andalso is_valid_map_key_value(Ke,Ctx) - andalso is_valid_map_key_value(Ve,Ctx) + B andalso is_valid_map_key_value(Ke) + andalso is_valid_map_key_value(Ve) end,true,Fs); {bin,_,Es} -> % only check for value expressions to be valid @@ -2378,9 +2365,9 @@ is_valid_map_key_value(K,Ctx) -> % core and kernel foldl(fun ({bin_element,_,E,_,_},B) -> - B andalso is_valid_map_key_value(E,Ctx) + B andalso is_valid_map_key_value(E) end,true,Es); - _ -> false + Val -> is_pattern_expr(Val) end. %% record_def(Line, RecordName, [RecField], State) -> State. |