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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2021-2024. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(ets_prop).
-include_lib("common_test/include/ct_property_test.hrl").
-type table_type() :: set | ordered_set | bag | duplicate_bag.
-define(ETS_TAB_DATA, proper_types:list({ct_proper_ext:safe_any(), ct_proper_ext:safe_any()})).
%%%%%%%%%%%%%%%%%%
%%% Properties %%%
%%%%%%%%%%%%%%%%%%
%% --- first/2 ----------------------------------------------------------
prop_first() ->
?FORALL(Type, noshrink(table_type()),
?FORALL(
DataList,
?ETS_TAB_DATA,
compare_with_and_without_lookup_variants(
Type, DataList,
fun (T, _) -> ets:first(T) end,
fun (T, _) -> ets:first_lookup(T) end)
)).
%% --- next/2 ----------------------------------------------------------
prop_next() ->
?FORALL(Type, noshrink(table_type()),
?FORALL(
DataList,
?ETS_TAB_DATA,
compare_with_and_without_lookup_variants(
Type, DataList, fun ets:next/2, fun ets:next_lookup/2)
)).
%% --- last/2 ----------------------------------------------------------
prop_last() ->
?FORALL(Type, noshrink(table_type()),
?FORALL(
DataList,
?ETS_TAB_DATA,
compare_with_and_without_lookup_variants(
Type, DataList,
fun (T, _) -> ets:last(T) end,
fun (T, _) -> ets:last_lookup(T) end)
)).
%% --- prev/2 ----------------------------------------------------------
prop_prev() ->
?FORALL(Type, noshrink(table_type()),
?FORALL(
DataList,
?ETS_TAB_DATA,
compare_with_and_without_lookup_variants(
Type, DataList, fun ets:prev/2, fun ets:prev_lookup/2)
)).
%%%% helpers %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
random_key([]) ->
'$end_of_table';
random_key([{Key, _}]) ->
Key;
random_key(Data) ->
RandomN = 1 + erlang:phash2(erlang:unique_integer(), length(Data)),
{Key, _} = lists:nth(RandomN, Data),
Key.
compare_with_and_without_lookup_variants(TableType, TableData, WithoutLookupFun, LookupFun) ->
Tab = ets:new(test, [TableType]),
ets:insert(Tab, TableData),
Res = do_compare_with_and_without_lookup_variants(
random_key(TableData), Tab, WithoutLookupFun, LookupFun),
ets:delete(Tab),
Res.
% compare variants of first/next/last/prev with and without _lookup to make sure they are consistent
% Key is the current position in the table, used for prev/next and ignored for first/last
% Key = '$end_of_table' means nothing to compare
do_compare_with_and_without_lookup_variants('$end_of_table', _Tab, _WithoutLookupFun, _LookupFun) ->
true;
do_compare_with_and_without_lookup_variants(Key, Tab, WithoutLookupFun, LookupFun) ->
Key2 = WithoutLookupFun(Tab, Key),
case Key2 of
'$end_of_table' ->
'$end_of_table' =:= LookupFun(Tab, Key);
_ ->
Values2 = ets:lookup(Tab, Key2),
{Key2, Values2} =:= LookupFun(Tab, Key)
end.
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