aboutsummaryrefslogtreecommitdiffstats
path: root/lib/stdlib/src/erl_lint.erl
diff options
context:
space:
mode:
Diffstat (limited to 'lib/stdlib/src/erl_lint.erl')
-rw-r--r--lib/stdlib/src/erl_lint.erl93
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.
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 07:01:48 +0000