%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1997-2013. 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%
%%
%%%----------------------------------------------------------------
%%% Purpose: Test suite for the 'lists' module.
%%%-----------------------------------------------------------------
-module(lists_SUITE).
-include_lib("test_server/include/test_server.hrl").
% Default timetrap timeout (set in init_per_testcase).
% This should be set relatively high (10-15 times the expected
% max testcasetime).
-define(default_timeout, ?t:minutes(4)).
% Test server specific exports
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
init_per_group/2,end_per_group/2]).
-export([init_per_testcase/2, end_per_testcase/2]).
% Test cases must be exported.
-export([member/1, reverse/1,
keymember/1, keysearch_keyfind/1,
keystore/1, keytake/1, keyreplace/1,
append_1/1, append_2/1,
seq_loop/1, seq_2/1, seq_3/1, seq_2_e/1, seq_3_e/1,
sublist_2/1, sublist_3/1, sublist_2_e/1, sublist_3_e/1,
flatten_1/1, flatten_2/1, flatten_1_e/1, flatten_2_e/1,
dropwhile/1, takewhile/1,
sort_1/1, sort_stable/1, merge/1, rmerge/1, sort_rand/1,
usort_1/1, usort_stable/1, umerge/1, rumerge/1,usort_rand/1,
keymerge/1, rkeymerge/1,
keysort_1/1, keysort_i/1, keysort_stable/1,
keysort_rand/1, keysort_error/1,
ukeymerge/1, rukeymerge/1,
ukeysort_1/1, ukeysort_i/1, ukeysort_stable/1,
ukeysort_rand/1, ukeysort_error/1,
funmerge/1, rfunmerge/1,
funsort_1/1, funsort_stable/1, funsort_rand/1,
funsort_error/1,
ufunmerge/1, rufunmerge/1,
ufunsort_1/1, ufunsort_stable/1, ufunsort_rand/1,
ufunsort_error/1,
zip_unzip/1, zip_unzip3/1, zipwith/1, zipwith3/1,
filter_partition/1,
otp_5939/1, otp_6023/1, otp_6606/1, otp_7230/1,
suffix/1, subtract/1, droplast/1, hof/1]).
%% Sort randomized lists until stopped.
%%
%% If you update some of the sort or merge functions, you should
%% definitely let sort_loop work for a couple of hours or days. Try
%% both sort_loop/0 and sort_loop/1 with a small argument (30-50 say).
-export([sort_loop/0, sort_loop/1, sloop/1]).
%% Internal export.
-export([make_fun/1]).
%%
%% all/1
%%
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[{group, append},
{group, key},
{group,sort},
{group, usort},
{group, keysort},
{group, ukeysort},
{group, funsort},
{group, ufunsort},
{group, sublist},
{group, flatten},
{group, seq},
{group, tickets},
{group, zip},
{group, misc}].
groups() ->
[{append, [parallel], [append_1, append_2]},
{usort, [parallel],
[umerge, rumerge, usort_1, usort_rand, usort_stable]},
{keysort, [parallel],
[keymerge, rkeymerge, keysort_1, keysort_rand,
keysort_i, keysort_stable, keysort_error]},
{key, [parallel], [keymember, keysearch_keyfind, keystore,
keytake, keyreplace]},
{sort,[parallel],[merge, rmerge, sort_1, sort_rand]},
{ukeysort, [parallel],
[ukeymerge, rukeymerge, ukeysort_1, ukeysort_rand,
ukeysort_i, ukeysort_stable, ukeysort_error]},
{funsort, [parallel],
[funmerge, rfunmerge, funsort_1, funsort_stable,
funsort_error, funsort_rand]},
{ufunsort, [parallel],
[ufunmerge, rufunmerge, ufunsort_1, ufunsort_stable,
ufunsort_error, ufunsort_rand]},
{seq, [parallel], [seq_loop, seq_2, seq_3, seq_2_e, seq_3_e]},
{sublist, [parallel],
[sublist_2, sublist_3, sublist_2_e, sublist_3_e]},
{flatten, [parallel],
[flatten_1, flatten_2, flatten_1_e, flatten_2_e]},
{tickets, [parallel], [otp_5939, otp_6023, otp_6606, otp_7230]},
{zip, [parallel], [zip_unzip, zip_unzip3, zipwith, zipwith3]},
{misc, [parallel], [reverse, member, dropwhile, takewhile,
filter_partition, suffix, subtract,
hof]}
].
init_per_suite(Config) ->
Config.
end_per_suite(_Config) ->
ok.
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
init_per_testcase(_Case, Config) ->
?line Dog=test_server:timetrap(?default_timeout),
[{watchdog, Dog}|Config].
end_per_testcase(_Case, Config) ->
Dog=?config(watchdog, Config),
test_server:timetrap_cancel(Dog),
ok.
%
% Test cases starts here.
%
append_1(doc) -> [];
append_1(suite) -> [];
append_1(Config) when is_list(Config) ->
?line "abcdef"=lists:append(["abc","def"]),
?line [hej, du,[glade, [bagare]]]=
lists:append([[hej], [du], [[glade, [bagare]]]]),
?line [10, [elem]]=lists:append([[10], [[elem]]]),
ok.
append_2(doc) -> [];
append_2(suite) -> [];
append_2(Config) when is_list(Config) ->
?line "abcdef"=lists:append("abc", "def"),
?line [hej, du]=lists:append([hej], [du]),
?line [10, [elem]]=lists:append([10], [[elem]]),
ok.
reverse(suite) ->
[];
reverse(doc) ->
["Tests the lists:reverse() implementation. The function is "
"`non-blocking', and only processes a fixed number of elements "
"at a time."];
reverse(Config) when is_list(Config) ->
?line reverse_test(0),
?line reverse_test(1),
?line reverse_test(2),
?line reverse_test(128),
?line reverse_test(256),
?line reverse_test(1000),
?line reverse_test(1998),
?line reverse_test(1999),
?line reverse_test(2000),
?line reverse_test(2001),
?line reverse_test(3998),
?line reverse_test(3999),
?line reverse_test(4000),
?line reverse_test(4001),
?line reverse_test(60001),
?line reverse_test(100007),
ok.
reverse_test(0) ->
case lists:reverse([]) of
[] ->
ok;
_Other ->
error
end;
reverse_test(Num) ->
List0 = ['The Element'|lists:duplicate(Num, 'Ele')],
List = lists:reverse(List0),
['Ele'|_] = List,
'The Element' = lists:last(List),
List0 = lists:reverse(List),
ok.
member(doc) ->
["Tests the lists:member() implementation."
"This test case depends on lists:reverse() to work, "
"wich is tested in a separate test case."];
member(Config) when is_list(Config) ->
?line {'EXIT',{badarg,_}} = (catch lists:member(45, {a,b,c})),
?line {'EXIT',{badarg,_}} = (catch lists:member(45, [0|non_list_tail])),
?line false = lists:member(4233, []),
?line member_test(1),
?line member_test(100),
?line member_test(256),
?line member_test(1000),
?line member_test(1998),
?line member_test(1999),
?line member_test(2000),
?line member_test(2001),
?line member_test(3998),
?line member_test(3999),
?line member_test(4000),
?line member_test(4001),
?line member_test(100008),
ok.
member_test(Num) ->
List0 = ['The Element'|lists:duplicate(Num, 'Elem')],
true = lists:member('The Element', List0),
true = lists:member('Elem', List0),
false = lists:member(arne_anka, List0),
false = lists:member({a,b,c}, List0),
List = lists:reverse(List0),
true = lists:member('The Element', List),
true = lists:member('Elem', List),
false = lists:member(arne_anka, List),
false = lists:member({a,b,c}, List).
keymember(Config) when is_list(Config) ->
?line false = lists:keymember(anything_goes, 1, []),
?line {'EXIT',{badarg,_}} = (catch lists:keymember(anything_goes, -1, [])),
?line {'EXIT',{badarg,_}} = (catch lists:keymember(anything_goes, 0, [])),
?line {'EXIT',{badarg,_}} = (catch lists:keymember(anything_goes, 1, {1,2,3})),
List = [{52.0,a},{-19,b,c},{37.5,d},an_atom,42.0,{39},{45,{x,y,z}}],
?line false = lists:keymember(333, 5, List),
?line false = lists:keymember(333, 999, List),
?line false = lists:keymember(37, 1, List),
?line true = lists:keymember(52.0, 1, List),
?line true = lists:keymember(52, 1, List),
?line true = lists:keymember(-19, 1, List),
?line true = lists:keymember(-19.0, 1, List),
?line true = lists:keymember(37.5, 1, List),
?line true = lists:keymember(39, 1, List),
?line true = lists:keymember(39.0, 1, List),
?line true = lists:keymember(45, 1, List),
?line true = lists:keymember(45.0, 1, List),
?line true = lists:keymember(a, 2, List),
?line true = lists:keymember(b, 2, List),
?line true = lists:keymember(c, 3, List),
?line true = lists:keymember(d, 2, List),
?line true = lists:keymember({x,y,z}, 2, List),
?line Long0 = lists:seq(1, 100007),
?line false = lists:keymember(kalle, 1, Long0),
?line Long = lists:foldl(fun(E, A) -> [{1/E,E}|A] end, [], Long0),
?line true = lists:keymember(1, 2, Long),
?line true = lists:keymember(2, 2, Long),
?line true = lists:keymember(1.0, 2, Long),
?line true = lists:keymember(2.0, 2, Long),
?line true = lists:keymember(100006, 2, Long),
ok.
keysearch_keyfind(Config) when is_list(Config) ->
?line false = key_search_find(anything_goes, 1, []),
?line {'EXIT',{badarg,_}} = (catch key_search_find(anything_goes, -1, [])),
?line {'EXIT',{badarg,_}} = (catch key_search_find(anything_goes, 0, [])),
?line {'EXIT',{badarg,_}} = (catch key_search_find(anything_goes, 1, {1,2,3})),
First = {x,42.0},
Second = {y,-77},
Third = {z,[a,b,c],{5.0}},
List = [First,Second,Third],
?line false = key_search_find(333, 1, []),
?line false = key_search_find(333, 5, List),
?line false = key_search_find(333, 999, List),
?line false = key_search_find(37, 1, List),
?line {value,First} = key_search_find(42, 2, List),
?line {value,First} = key_search_find(42.0, 2, List),
?line {value,Second} = key_search_find(-77, 2, List),
?line {value,Second} = key_search_find(-77.0, 2, List),
?line {value,Third} = key_search_find(z, 1, List),
?line {value,Third} = key_search_find([a,b,c], 2, List),
?line {value,Third} = key_search_find({5}, 3, List),
?line {value,Third} = key_search_find({5.0}, 3, List),
?line Long0 = lists:seq(1, 100007),
?line false = key_search_find(kalle, 1, Long0),
?line Long = lists:foldl(fun(E, A) -> [{1/E,float(E)}|A] end, [], Long0),
?line {value,{_,1.0}} = key_search_find(1, 2, Long),
?line {value,{_,1.0}} = key_search_find(1.0, 2, Long),
?line {value,{_,2.0}} = key_search_find(2, 2, Long),
?line {value,{_,2.0}} = key_search_find(2.0, 2, Long),
?line {value,{_,33988.0}} = key_search_find(33988, 2, Long),
?line {value,{_,33988.0}} = key_search_find(33988.0, 2, Long),
ok.
%% Test both lists:keysearch/3 and lists:keyfind/3. The only
%% difference between these two functions is that lists:keysearch/3
%% wraps a successfully returned tuple in a value tuple.
%%
key_search_find(Key, Pos, List) ->
case lists:keyfind(Key, Pos, List) of
false ->
false = lists:keysearch(Key, Pos, List);
Tuple when is_tuple(Tuple) ->
{value,Tuple} = lists:keysearch(Key, Pos, List)
end.
dropwhile(Config) when is_list(Config) ->
?line F = fun(C) -> C =:= $@ end,
?line [] = lists:dropwhile(F, []),
?line [a] = lists:dropwhile(F, [a]),
?line [a,b] = lists:dropwhile(F, [a,b]),
?line [a,b,c] = lists:dropwhile(F, [a,b,c]),
?line [] = lists:dropwhile(F, [$@]),
?line [] = lists:dropwhile(F, [$@,$@]),
?line [a,$@] = lists:dropwhile(F, [$@,a,$@]),
?line [$k] = lists:dropwhile(F, [$@,$k]),
?line [$k,$l] = lists:dropwhile(F, [$@,$@,$k,$l]),
?line [a] = lists:dropwhile(F, [$@,$@,$@,a]),
?line [a,$@,b] = lists:dropwhile(F, [$@,a,$@,b]),
?line [a,$@,b] = lists:dropwhile(F, [$@,$@,a,$@,b]),
?line [a,$@,b] = lists:dropwhile(F, [$@,$@,$@,a,$@,b]),
Long = lists:seq(1, 1024),
Shorter = lists:seq(800, 1024),
?line Shorter = lists:dropwhile(fun(E) -> E < 800 end, Long),
ok.
takewhile(Config) when is_list(Config) ->
F = fun(C) -> C =/= $@ end,
[] = lists:takewhile(F, []),
[a] = lists:takewhile(F, [a]),
[a,b] = lists:takewhile(F, [a,b]),
[a,b,c] = lists:takewhile(F, [a,b,c]),
[] = lists:takewhile(F, [$@]),
[] = lists:takewhile(F, [$@,$@]),
[a] = lists:takewhile(F, [a,$@]),
[$k] = lists:takewhile(F, [$k,$@]),
[$k,$l] = lists:takewhile(F, [$k,$l,$@,$@]),
[a] = lists:takewhile(F, [a,$@,$@,$@]),
[] = lists:takewhile(F, [$@,a,$@,b]),
[] = lists:takewhile(F, [$@,$@,a,$@,b]),
[] = lists:takewhile(F, [$@,$@,$@,a,$@,b]),
Long = lists:seq(1, 1024),
Shorter = lists:seq(1, 400),
Shorter = lists:takewhile(fun(E) -> E =< 400 end, Long),
ok.
keystore(doc) ->
["OTP-XXX."];
keystore(suite) -> [];
keystore(Config) when is_list(Config) ->
?line {'EXIT',_} = (catch lists:keystore(key, 0, [], {1})),
?line {'EXIT',_} = (catch lists:keystore(key, 1, {}, {})),
?line {'EXIT',_} = (catch lists:keystore(key, 1, {a,b}, {})),
?line {'EXIT', _} = (catch lists:keystore(a, 2, [{1,a}], b)),
T = {k,17},
?line [T] = lists:keystore(a, 2, [], T),
?line [{1,a},{2,b},{k,17}] = lists:keystore(c, 2, [{1,a},{2,b}],T),
L = [{1,a},{2,b},{3,c}],
?line [{k,17},{2,b},{3,c}] = lists:keystore(a, 2, L, T),
?line [{1,a},{k,17},{3,c}] = lists:keystore(b, 2, L, T),
?line [{1,a},{2,b},{k,17}] = lists:keystore(c, 2, L, T),
?line [{2,b}] = lists:keystore(a, 2, [{1,a}], {2,b}),
?line [{1,a}] = lists:keystore(foo, 1, [], {1,a}),
ok.
keytake(doc) ->
["OTP-XXX."];
keytake(suite) -> [];
keytake(Config) when is_list(Config) ->
?line {'EXIT',_} = (catch lists:keytake(key, 0, [])),
?line {'EXIT',_} = (catch lists:keytake(key, 1, {})),
?line {'EXIT',_} = (catch lists:keytake(key, 1, {a,b})),
?line false = lists:keytake(key, 2, [{a}]),
?line false = lists:keytake(key, 1, [a]),
?line false = lists:keytake(k, 1, []),
?line false = lists:keytake(k, 1, [{a},{b},{c}]),
L = [{a,1},{b,2},{c,3}],
?line {value,{a,1},[{b,2},{c,3}]} = lists:keytake(1, 2, L),
?line {value,{b,2},[{a,1},{c,3}]} = lists:keytake(2, 2, L),
?line {value,{c,3},[{a,1},{b,2}]} = lists:keytake(3, 2, L),
?line false = lists:keytake(4, 2, L),
ok.
%% Test lists:keyreplace/4.
keyreplace(Config) when is_list(Config) ->
[{new,42}] = lists:keyreplace(k, 1, [{k,1}], {new,42}),
[atom,{new,a,b}] = lists:keyreplace(k, 1, [atom,{k,1}], {new,a,b}),
[a,{x,y,z}] = lists:keyreplace(a, 5, [a,{x,y,z}], {no,use}),
%% Error cases.
{'EXIT',_} = (catch lists:keyreplace(k, 1, [], not_tuple)),
{'EXIT',_} = (catch lists:keyreplace(k, 0, [], {a,b})),
ok.
merge(doc) -> ["merge functions"];
merge(suite) -> [];
merge(Config) when is_list(Config) ->
%% merge list of lists
?line [] = lists:merge([]),
?line [] = lists:merge([[]]),
?line [] = lists:merge([[],[]]),
?line [] = lists:merge([[],[],[]]),
?line [1] = lists:merge([[1]]),
?line [1,1,2,2] = lists:merge([[1,2],[1,2]]),
?line [1] = lists:merge([[1],[],[]]),
?line [1] = lists:merge([[],[1],[]]),
?line [1] = lists:merge([[],[],[1]]),
?line [1,2] = lists:merge([[1],[2],[]]),
?line [1,2] = lists:merge([[1],[],[2]]),
?line [1,2] = lists:merge([[],[1],[2]]),
?line [1,2,3,4,5,6] = lists:merge([[1,2],[],[5,6],[],[3,4],[]]),
?line [1,2,3,4] = lists:merge([[4],[3],[2],[1]]),
?line [1,2,3,4,5] = lists:merge([[1],[2],[3],[4],[5]]),
?line [1,2,3,4,5,6] = lists:merge([[1],[2],[3],[4],[5],[6]]),
?line [1,2,3,4,5,6,7,8,9] =
lists:merge([[1],[2],[3],[4],[5],[6],[7],[8],[9]]),
Seq = lists:seq(1,100),
?line true = Seq == lists:merge(lists:map(fun(E) -> [E] end, Seq)),
Two = [1,2],
Six = [1,2,3,4,5,6],
%% 2-way merge
?line [] = lists:merge([], []),
?line Two = lists:merge(Two, []),
?line Two = lists:merge([], Two),
?line Six = lists:merge([1,3,5], [2,4,6]),
?line Six = lists:merge([2,4,6], [1,3,5]),
?line Six = lists:merge([1,2,3], [4,5,6]),
?line Six = lists:merge([4,5,6], [1,2,3]),
?line Six = lists:merge([1,2,5],[3,4,6]),
?line [1,2,3,5,7] = lists:merge([1,3,5,7], [2]),
?line [1,2,3,4,5,7] = lists:merge([1,3,5,7], [2,4]),
?line [1,2,3,4,5,6,7] = lists:merge([1,3,5,7], [2,4,6]),
?line [1,2,3,5,7] = lists:merge([2], [1,3,5,7]),
?line [1,2,3,4,5,7] = lists:merge([2,4], [1,3,5,7]),
?line [1,2,3,4,5,6,7] = lists:merge([2,4,6], [1,3,5,7]),
%% 3-way merge
?line [] = lists:merge3([], [], []),
?line Two = lists:merge3([], [], Two),
?line Two = lists:merge3([], Two, []),
?line Two = lists:merge3(Two, [], []),
?line Six = lists:merge3([], [1,3,5], [2,4,6]),
?line Six = lists:merge3([1,3,5], [], [2,4,6]),
?line Six = lists:merge3([1,3,5], [2,4,6], []),
?line Nine = lists:merge3([1,4,7],[2,5,8],[3,6,9]),
?line Nine = lists:merge3([1,4,7],[3,6,9],[2,5,8]),
?line Nine = lists:merge3([3,6,9],[1,4,7],[2,5,8]),
?line Nine = lists:merge3([4,5,6],[1,2,3],[7,8,9]),
?line Nine = lists:merge3([1,2,3],[4,5,6],[7,8,9]),
?line Nine = lists:merge3([7,8,9],[4,5,6],[1,2,3]),
?line Nine = lists:merge3([4,5,6],[7,8,9],[1,2,3]),
ok.
rmerge(doc) -> ["reverse merge functions"];
rmerge(suite) -> [];
rmerge(Config) when is_list(Config) ->
Two = [2,1],
Six = [6,5,4,3,2,1],
%% 2-way reversed merge
?line [] = lists:rmerge([], []),
?line Two = lists:rmerge(Two, []),
?line Two = lists:rmerge([], Two),
?line Six = lists:rmerge([5,3,1], [6,4,2]),
?line Six = lists:rmerge([6,4,2], [5,3,1]),
?line Six = lists:rmerge([3,2,1], [6,5,4]),
?line Six = lists:rmerge([6,5,4], [3,2,1]),
?line Six = lists:rmerge([4,3,2],[6,5,1]),
?line [7,6,5,3,1] = lists:rmerge([7,5,3,1], [6]),
?line [7,6,5,4,3,1] = lists:rmerge([7,5,3,1], [6,4]),
?line [7,6,5,4,3,2,1] = lists:rmerge([7,5,3,1], [6,4,2]),
?line [7,5,3,2,1] = lists:rmerge([2], [7,5,3,1]),
?line [7,5,4,3,2,1] = lists:rmerge([4,2], [7,5,3,1]),
?line [7,6,5,4,3,2,1] = lists:rmerge([6,4,2], [7,5,3,1]),
Nine = [9,8,7,6,5,4,3,2,1],
%% 3-way reversed merge
?line [] = lists:rmerge3([], [], []),
?line Two = lists:rmerge3([], [], Two),
?line Two = lists:rmerge3([], Two, []),
?line Two = lists:rmerge3(Two, [], []),
?line Six = lists:rmerge3([], [5,3,1], [6,4,2]),
?line Six = lists:rmerge3([5,3,1], [], [6,4,2]),
?line Six = lists:rmerge3([5,3,1], [6,4,2], []),
?line Nine = lists:rmerge3([7,4,1],[8,5,2],[9,6,3]),
?line Nine = lists:rmerge3([7,4,1],[9,6,3],[8,5,2]),
?line Nine = lists:rmerge3([9,6,3],[7,4,1],[8,5,2]),
?line Nine = lists:rmerge3([6,5,4],[3,2,1],[9,8,7]),
?line Nine = lists:rmerge3([3,2,1],[6,5,4],[9,8,7]),
?line Nine = lists:rmerge3([9,8,7],[6,5,4],[3,2,1]),
?line Nine = lists:rmerge3([6,5,4],[9,8,7],[3,2,1]),
ok.
sort_1(doc) -> ["sort/1"];
sort_1(suite) -> [];
sort_1(Config) when is_list(Config) ->
?line [] = lists:sort([]),
?line [a] = lists:sort([a]),
?line [a,a] = lists:sort([a,a]),
?line [a,b] = lists:sort([a,b]),
?line [a,b] = lists:sort([b,a]),
?line [1,1] = lists:sort([1,1]),
?line [1,1,2,3] = lists:sort([1,1,3,2]),
?line [1,2,3,3] = lists:sort([3,3,1,2]),
?line [1,1,1,1] = lists:sort([1,1,1,1]),
?line [1,1,1,2,2,2,3,3,3] = lists:sort([3,3,3,2,2,2,1,1,1]),
?line [1,1,1,2,2,2,3,3,3] = lists:sort([1,1,1,2,2,2,3,3,3]),
?line lists:foreach(fun check/1, perms([1,2,3])),
?line lists:foreach(fun check/1, perms([1,2,3,4,5,6,7,8])),
ok.
sort_rand(doc) -> ["sort/1 on big randomized lists"];
sort_rand(suite) -> [];
sort_rand(Config) when is_list(Config) ->
?line ok = check(biglist(10)),
?line ok = check(biglist(100)),
?line ok = check(biglist(1000)),
?line ok = check(biglist(10000)),
ok.
%% sort/1 was really stable for a while - the order of equal elements
%% was kept - but since the performance suffered a bit, this "feature"
%% was removed.
sort_stable(doc) -> ["sort/1 should be stable for equal terms."];
sort_stable(suite) -> [];
sort_stable(Config) when is_list(Config) ->
?line ok = check_stability(bigfunlist(10)),
?line ok = check_stability(bigfunlist(100)),
?line ok = check_stability(bigfunlist(1000)),
?line case erlang:system_info(modified_timing_level) of
undefined -> ok = check_stability(bigfunlist(10000));
_ -> ok
end,
ok.
check([]) ->
ok;
check(L) ->
S = lists:sort(L),
case {length(L) == length(S), check(hd(S), tl(S))} of
{true,ok} ->
ok;
_ ->
io:format("~w~n", [L]),
erlang:error(check)
end.
check(_A, []) ->
ok;
check(A, [B | L]) when A =< B ->
check(B, L);
check(_A, _L) ->
no.
%% The check that sort/1 is stable is no longer used.
%% Equal elements are no longer always kept in order.
check_stability(L) ->
S = lists:sort(L),
LP = explicit_pid(L),
SP = explicit_pid(S),
check_sorted(1, 2, LP, SP).
explicit_pid(L) ->
lists:reverse(expl_pid(L, [])).
expl_pid([{I,F} | T], L) when is_function(F) ->
expl_pid(T, [{I,fun_pid(F)} | L]);
expl_pid([], L) ->
L.
usort_1(suite) -> [];
usort_1(doc) -> [""];
usort_1(Conf) when is_list(Conf) ->
?line [] = lists:usort([]),
?line [1] = lists:usort([1]),
?line [1] = lists:usort([1,1]),
?line [1] = lists:usort([1,1,1,1,1]),
?line [1,2] = lists:usort([1,2]),
?line [1,2] = lists:usort([1,2,1]),
?line [1,2] = lists:usort([1,2,2]),
?line [1,2,3] = lists:usort([1,3,2]),
?line [1,3] = lists:usort([3,1,3]),
?line [0,1,3] = lists:usort([3,1,0]),
?line [1,2,3] = lists:usort([3,1,2]),
?line [1,2] = lists:usort([2,1,1]),
?line [1,2] = lists:usort([2,1]),
?line [0,3,4,8,9] = lists:usort([3,8,9,0,9,4]),
?line lists:foreach(fun ucheck/1, perms([1,2,3])),
?line lists:foreach(fun ucheck/1, perms([1,2,3,4,5,6,2,1])),
ok.
umerge(suite) -> [];
umerge(doc) -> [""];
umerge(Conf) when is_list(Conf) ->
%% merge list of lists
?line [] = lists:umerge([]),
?line [] = lists:umerge([[]]),
?line [] = lists:umerge([[],[]]),
?line [] = lists:umerge([[],[],[]]),
?line [1] = lists:umerge([[1]]),
?line [1,2] = lists:umerge([[1,2],[1,2]]),
?line [1] = lists:umerge([[1],[],[]]),
?line [1] = lists:umerge([[],[1],[]]),
?line [1] = lists:umerge([[],[],[1]]),
?line [1,2] = lists:umerge([[1],[2],[]]),
?line [1,2] = lists:umerge([[1],[],[2]]),
?line [1,2] = lists:umerge([[],[1],[2]]),
?line [1,2,3,4,5,6] = lists:umerge([[1,2],[],[5,6],[],[3,4],[]]),
?line [1,2,3,4] = lists:umerge([[4],[3],[2],[1]]),
?line [1,2,3,4,5] = lists:umerge([[1],[2],[3],[4],[5]]),
?line [1,2,3,4,5,6] = lists:umerge([[1],[2],[3],[4],[5],[6]]),
?line [1,2,3,4,5,6,7,8,9] =
lists:umerge([[1],[2],[3],[4],[5],[6],[7],[8],[9]]),
?line [1,2,4,6,8] = lists:umerge([[1,2],[2,4,6,8]]),
Seq = lists:seq(1,100),
?line true = Seq == lists:umerge(lists:map(fun(E) -> [E] end, Seq)),
Two = [1,2],
Six = [1,2,3,4,5,6],
%% 2-way unique merge
?line [] = lists:umerge([], []),
?line Two = lists:umerge(Two, []),
?line Two = lists:umerge([], Two),
?line Six = lists:umerge([1,3,5], [2,4,6]),
?line Six = lists:umerge([2,4,6], [1,3,5]),
?line Six = lists:umerge([1,2,3], [4,5,6]),
?line Six = lists:umerge([4,5,6], [1,2,3]),
?line Six = lists:umerge([1,2,5],[3,4,6]),
?line [1,2,3,5,7] = lists:umerge([1,3,5,7], [2]),
?line [1,2,3,4,5,7] = lists:umerge([1,3,5,7], [2,4]),
?line [1,2,3,4,5,6,7] = lists:umerge([1,3,5,7], [2,4,6]),
?line [1,2,3,5,7] = lists:umerge([2], [1,3,5,7]),
?line [1,2,3,4,5,7] = lists:umerge([2,4], [1,3,5,7]),
?line [1,2,3,4,5,6,7] = lists:umerge([2,4,6], [1,3,5,7]),
?line [1,2,3,5,7] = lists:umerge([1,2,3,5,7], [2]),
?line [1,2,3,4,5,7] = lists:umerge([1,2,3,4,5,7], [2,4]),
?line [1,2,3,4,5,6,7] = lists:umerge([1,2,3,4,5,6,7], [2,4,6]),
?line [1,2,3,5,7] = lists:umerge([2], [1,2,3,5,7]),
?line [1,2,3,4,5,7] = lists:umerge([2,4], [1,2,3,4,5,7]),
?line [1,2,3,4,5,6,7] = lists:umerge([2,4,6], [1,2,3,4,5,6,7]),
%% 3-way unique merge
?line [] = lists:umerge3([], [], []),
?line Two = lists:umerge3([], [], Two),
?line Two = lists:umerge3([], Two, []),
?line Two = lists:umerge3(Two, [], []),
?line Six = lists:umerge3([], [1,3,5], [2,4,6]),
?line Six = lists:umerge3([1,3,5], [], [2,4,6]),
?line Six = lists:umerge3([1,3,5], [2,4,6], []),
?line Nine = lists:umerge3([1,4,7],[2,5,8],[3,6,9]),
?line Nine = lists:umerge3([1,4,7],[3,6,9],[2,5,8]),
?line Nine = lists:umerge3([3,6,9],[1,4,7],[2,5,8]),
?line Nine = lists:umerge3([4,5,6],[1,2,3],[7,8,9]),
?line Nine = lists:umerge3([1,2,3],[4,5,6],[7,8,9]),
?line Nine = lists:umerge3([7,8,9],[4,5,6],[1,2,3]),
?line Nine = lists:umerge3([4,5,6],[7,8,9],[1,2,3]),
?line [1,2,3] = lists:umerge3([1,2,3],[1,2,3],[1,2,3]),
?line [1,2,3,4] = lists:umerge3([2,3,4],[1,2,3],[2,3,4]),
?line [1,2,3] = lists:umerge3([1,2,3],[2,3],[1,2,3]),
?line [1,2,3,4] = lists:umerge3([2,3,4],[3,4],[1,2,3]),
ok.
rumerge(suite) -> [];
rumerge(doc) -> [""];
rumerge(Conf) when is_list(Conf) ->
Two = [2,1],
Six = [6,5,4,3,2,1],
%% 2-way reversed unique merge
?line [] = lists:rumerge([], []),
?line Two = lists:rumerge(Two, []),
?line Two = lists:rumerge([], Two),
?line Six = lists:rumerge([5,3,1], [6,4,2]),
?line Six = lists:rumerge([6,4,2], [5,3,1]),
?line Six = lists:rumerge([3,2,1], [6,5,4]),
?line Six = lists:rumerge([6,5,4], [3,2,1]),
?line Six = lists:rumerge([4,3,2],[6,5,1]),
?line [7,6,5,3,1] = lists:rumerge([7,5,3,1], [6]),
?line [7,6,5,4,3,1] = lists:rumerge([7,5,3,1], [6,4]),
?line [7,6,5,4,3,2,1] = lists:rumerge([7,5,3,1], [6,4,2]),
?line [7,5,3,2,1] = lists:rumerge([2], [7,5,3,1]),
?line [7,5,4,3,2,1] = lists:rumerge([4,2], [7,5,3,1]),
?line [7,6,5,4,3,2,1] = lists:rumerge([6,4,2], [7,5,3,1]),
?line [7,6,5,3,1] = lists:rumerge([7,6,5,3,1], [6]),
?line [7,6,5,4,3,1] = lists:rumerge([7,6,5,4,3,1], [6,4]),
?line [7,6,5,4,3,2,1] = lists:rumerge([7,6,5,4,3,2,1], [6,4,2]),
?line [7,5,3,2,1] = lists:rumerge([2], [7,5,3,2,1]),
?line [7,5,4,3,2,1] = lists:rumerge([4,2], [7,5,4,3,2,1]),
?line [7,6,5,4,3,2,1] = lists:rumerge([6,4,2], [7,6,5,4,3,2,1]),
Nine = [9,8,7,6,5,4,3,2,1],
%% 3-way reversed unique merge
?line [] = lists:rumerge3([], [], []),
?line Two = lists:rumerge3([], [], Two),
?line Two = lists:rumerge3([], Two, []),
?line Two = lists:rumerge3(Two, [], []),
?line Six = lists:rumerge3([], [5,3,1], [6,4,2]),
?line Six = lists:rumerge3([5,3,1], [], [6,4,2]),
?line Six = lists:rumerge3([5,3,1], [6,4,2], []),
?line Nine = lists:rumerge3([7,4,1],[8,5,2],[9,6,3]),
?line Nine = lists:rumerge3([7,4,1],[9,6,3],[8,5,2]),
?line Nine = lists:rumerge3([9,6,3],[7,4,1],[8,5,2]),
?line Nine = lists:rumerge3([6,5,4],[3,2,1],[9,8,7]),
?line Nine = lists:rumerge3([3,2,1],[6,5,4],[9,8,7]),
?line Nine = lists:rumerge3([9,8,7],[6,5,4],[3,2,1]),
?line Nine = lists:rumerge3([6,5,4],[9,8,7],[3,2,1]),
?line [3,2,1] = lists:rumerge3([3,2,1],[3,2,1],[3,2,1]),
?line [4,3,2,1] = lists:rumerge3([4,3,2],[3,2,1],[3,2,1]),
?line [5,4,3,2,1] = lists:rumerge3([4,3,2],[5,4,3,2],[5,4,3,2,1]),
?line [6,5,4,3,2] = lists:rumerge3([4,3,2],[5,4,3,2],[6,5,4,3]),
L1 = [c,d,e],
L2 = [b,c,d],
?line true =
lists:umerge(L1, L2) ==
lists:reverse(lists:rumerge(lists:reverse(L1), lists:reverse(L2))),
ok.
usort_rand(doc) -> ["usort/1 on big randomized lists"];
usort_rand(suite) -> [];
usort_rand(Config) when is_list(Config) ->
?line ok = ucheck(biglist(10)),
?line ok = ucheck(biglist(100)),
?line ok = ucheck(biglist(1000)),
?line ok = ucheck(biglist(10000)),
?line ok = ucheck(ubiglist(10)),
?line ok = ucheck(ubiglist(100)),
?line ok = ucheck(ubiglist(1000)),
?line ok = ucheck(ubiglist(10000)),
ok.
usort_stable(doc) -> ["usort/1 should keep the first duplicate."];
usort_stable(suite) -> [];
usort_stable(Config) when is_list(Config) ->
?line ok = ucheck_stability(bigfunlist(3)),
?line ok = ucheck_stability(bigfunlist(10)),
?line ok = ucheck_stability(bigfunlist(100)),
?line ok = ucheck_stability(bigfunlist(1000)),
?line case erlang:system_info(modified_timing_level) of
undefined -> ok = ucheck_stability(bigfunlist(10000));
_ -> ok
end,
ok.
ucheck([]) ->
ok;
ucheck(L) ->
S = lists:usort(L),
case ucheck(hd(S), tl(S)) of
ok ->
ok;
_ ->
io:format("~w~n", [L]),
erlang:error(ucheck)
end.
ucheck(_A, []) ->
ok;
ucheck(A, [B | L]) when A < B ->
ucheck(B, L);
ucheck(_A, _L) ->
no.
%% Check that usort/1 is stable and correct relative ukeysort/2.
ucheck_stability(L) ->
S = no_dups(lsort(L)),
U = lists:usort(L),
check_stab(L, U, S, "usort/1", "ukeysort/2").
keymerge(doc) -> ["Key merge two lists."];
keymerge(suite) -> [];
keymerge(Config) when is_list(Config) ->
Two = [{1,a},{2,b}],
Six = [{1,a},{2,b},{3,c},{4,d},{5,e},{6,f}],
%% 2-way keymerge
?line [] = lists:keymerge(1, [], []),
?line Two = lists:keymerge(1, Two, []),
?line Two = lists:keymerge(1, [], Two),
?line Six = lists:keymerge(1, [{1,a},{3,c},{5,e}], [{2,b},{4,d},{6,f}]),
?line Six = lists:keymerge(1, [{2,b},{4,d},{6,f}], [{1,a},{3,c},{5,e}]),
?line Six = lists:keymerge(1, [{1,a},{2,b},{3,c}], [{4,d},{5,e},{6,f}]),
?line Six = lists:keymerge(1, [{4,d},{5,e},{6,f}], [{1,a},{2,b},{3,c}]),
?line Six = lists:keymerge(1, [{1,a},{2,b},{5,e}],[{3,c},{4,d},{6,f}]),
?line [{1,a},{2,b},{3,c},{5,e},{7,g}] =
lists:keymerge(1, [{1,a},{3,c},{5,e},{7,g}], [{2,b}]),
?line [{1,a},{2,b},{3,c},{4,d},{5,e},{7,g}] =
lists:keymerge(1, [{1,a},{3,c},{5,e},{7,g}], [{2,b},{4,d}]),
?line [{1,a},{2,b},{3,c},{4,d},{5,e},{6,f},{7,g}] =
lists:keymerge(1, [{1,a},{3,c},{5,e},{7,g}], [{2,b},{4,d},{6,f}]),
?line [{1,a},{2,b},{3,c},{5,e},{7,g}] =
lists:keymerge(1, [{2,b}], [{1,a},{3,c},{5,e},{7,g}]),
?line [{1,a},{2,b},{3,c},{4,d},{5,e},{7,g}] =
lists:keymerge(1, [{2,b},{4,d}], [{1,a},{3,c},{5,e},{7,g}]),
?line [{1,a},{2,b},{3,c},{4,d},{5,e},{6,f},{7,g}] =
lists:keymerge(1, [{2,b},{4,d},{6,f}], [{1,a},{3,c},{5,e},{7,g}]),
?line [{b,2},{c,11},{c,12},{c,21},{c,22},{e,5}] =
lists:keymerge(1,[{c,11},{c,12},{e,5}], [{b,2},{c,21},{c,22}]),
ok.
rkeymerge(doc) -> ["Reverse key merge two lists."];
rkeymerge(suite) -> [];
rkeymerge(Config) when is_list(Config) ->
Two = [{2,b},{1,a}],
Six = [{6,f},{5,e},{4,d},{3,c},{2,b},{1,a}],
%% 2-way reversed keymerge
?line [] = lists:rkeymerge(1, [], []),
?line Two = lists:rkeymerge(1, Two, []),
?line Two = lists:rkeymerge(1, [], Two),
?line Six = lists:rkeymerge(1, [{5,e},{3,c},{1,a}], [{6,f},{4,d},{2,b}]),
?line Six = lists:rkeymerge(1, [{6,f},{4,d},{2,b}], [{5,e},{3,c},{1,a}]),
?line Six = lists:rkeymerge(1, [{3,c},{2,b},{1,a}], [{6,f},{5,e},{4,d}]),
?line Six = lists:rkeymerge(1, [{6,f},{5,e},{4,d}], [{3,c},{2,b},{1,a}]),
?line Six = lists:rkeymerge(1, [{4,d},{3,c},{2,b}],[{6,f},{5,e},{1,a}]),
?line [{7,g},{6,f},{5,e},{3,c},{1,a}] =
lists:rkeymerge(1, [{7,g},{5,e},{3,c},{1,a}], [{6,f}]),
?line [{7,g},{6,f},{5,e},{4,d},{3,c},{1,a}] =
lists:rkeymerge(1, [{7,g},{5,e},{3,c},{1,a}], [{6,f},{4,d}]),
?line [{7,g},{6,f},{5,e},{4,d},{3,c},{2,b},{1,a}] =
lists:rkeymerge(1, [{7,g},{5,e},{3,c},{1,a}], [{6,f},{4,d},{2,b}]),
?line [{7,g},{5,e},{3,c},{2,b},{1,a}] =
lists:rkeymerge(1, [{2,b}], [{7,g},{5,e},{3,c},{1,a}]),
?line [{7,g},{5,e},{4,d},{3,c},{2,b},{1,a}] =
lists:rkeymerge(1, [{4,d},{2,b}], [{7,g},{5,e},{3,c},{1,a}]),
?line [{7,g},{6,f},{5,e},{4,d},{3,c},{2,b},{1,a}] =
lists:rkeymerge(1, [{6,f},{4,d},{2,b}], [{7,g},{5,e},{3,c},{1,a}]),
L1 = [{c,11},{c,12},{e,5}],
L2 = [{b,2},{c,21},{c,22}],
?line true =
lists:keymerge(1, L1, L2) ==
lists:reverse(lists:rkeymerge(1,lists:reverse(L1),
lists:reverse(L2))),
ok.
keysort_1(doc) -> ["keysort"];
keysort_1(suite) -> [];
keysort_1(Config) when is_list(Config) ->
?line ok = keysort_check(1, [], []),
?line ok = keysort_check(1, [{a,b}], [{a,b}]),
?line ok = keysort_check(1, [{a,b},{a,b}], [{a,b},{a,b}]),
?line ok = keysort_check(1, [{a,b},{b,c}], [{a,b},{b,c}]),
?line ok = keysort_check(1, [{b,c},{a,b}], [{a,b},{b,c}]),
?line ok = keysort_check(1,
[{1,e},{3,f},{2,y},{0,z},{x,14}],
[{0,z},{1,e},{2,y},{3,f},{x,14}]),
?line ok = keysort_check(1,
[{1,a},{1,a},{1,a},{1,a}],
[{1,a},{1,a},{1,a},{1,a}]),
?line [{b,1},{c,1}] = lists:keysort(1, [{c,1},{b,1}]),
?line [{a,0},{b,2},{c,3},{d,4}] =
lists:keysort(1, [{d,4},{c,3},{b,2},{a,0}]),
?line [{a,0},{b,1},{b,2},{c,1}] =
lists:keysort(1, [{c,1},{b,1},{b,2},{a,0}]),
?line [{a,0},{b,1},{b,2},{c,1},{d,4}] =
lists:keysort(1, [{c,1},{b,1},{b,2},{a,0},{d,4}]),
SFun = fun(L) -> fun(X) -> keysort_check(1, X, L) end end,
L1 = [{1,a},{2,b},{3,c}],
?line lists:foreach(SFun(L1), perms(L1)),
L2 = [{1,a},{1,a},{2,b}],
?line lists:foreach(SFun(L2), perms(L2)),
L3 = [{1,a},{1,a},{1,a},{2,b}],
?line lists:foreach(SFun(L3), perms(L3)),
L4 = [{a,1},{a,1},{b,2},{b,2},{c,3},{d,4},{e,5},{f,6}],
?line lists:foreach(SFun(L4), perms(L4)),
ok.
keysort_stable(doc) -> ["keysort should be stable"];
keysort_stable(suite) -> [];
keysort_stable(Config) when is_list(Config) ->
?line ok = keysort_check(1, [{1,b},{1,c}], [{1,b},{1,c}]),
?line ok = keysort_check(1, [{1,c},{1,b}], [{1,c},{1,b}]),
?line ok = keysort_check(1,
[{1,c},{1,b},{2,x},{3,p},{2,a}],
[{1,c},{1,b},{2,x},{2,a},{3,p}]),
?line ok = keysort_check(1,
[{1,a},{1,b},{1,a},{1,a}],
[{1,a},{1,b},{1,a},{1,a}]),
ok.
keysort_error(doc) -> ["keysort should exit when given bad arguments"];
keysort_error(suite) -> [];
keysort_error(Config) when is_list(Config) ->
?line {'EXIT', _} = (catch lists:keysort(0, [{1,b},{1,c}])),
?line {'EXIT', _} = (catch lists:keysort(3, [{1,b},{1,c}])),
?line {'EXIT', _} = (catch lists:keysort(1.5, [{1,b},{1,c}])),
?line {'EXIT', _} = (catch lists:keysort(x, [{1,b},{1,c}])),
?line {'EXIT', _} = (catch lists:keysort(x, [])),
?line {'EXIT', _} = (catch lists:keysort(x, [{1,b}])),
?line {'EXIT', _} = (catch lists:keysort(1, [a,b])),
?line {'EXIT', _} = (catch lists:keysort(1, [{1,b} | {1,c}])),
ok.
keysort_i(doc) -> ["keysort with other key than first element"];
keysort_i(suite) -> [];
keysort_i(Config) when is_list(Config) ->
?line ok = keysort_check(2, [{a,2},{b,1},{c,3}], [{b,1},{a,2},{c,3}]),
ok.
keysort_rand(doc) -> ["keysort on big randomized lists"];
keysort_rand(suite) -> [];
keysort_rand(Config) when is_list(Config) ->
?line ok = keysort_check3(1, biglist(10)),
?line ok = keysort_check3(1, biglist(100)),
?line ok = keysort_check3(1, biglist(1000)),
?line ok = keysort_check3(1, biglist(10000)),
?line ok = keysort_check3(2, biglist(10)),
?line ok = keysort_check3(2, biglist(100)),
?line ok = keysort_check3(2, biglist(1000)),
?line ok = keysort_check3(2, biglist(10000)),
ok.
%%% Keysort a list, check that the returned list is what we expected,
%%% and that it is actually sorted.
keysort_check(I, Input, Expected) ->
?line Expected = lists:keysort(I, Input),
check_sorted(I, Input, Expected).
keysort_check3(I, Input) ->
check_sorted(I, 3, Input, lists:keysort(I, Input)).
check_sorted(I, Input, L) ->
check_sorted(I, I, Input, L).
%%% Check that a list is keysorted by element I. Elements comparing equal
%%% should be sorted according to element J.
check_sorted(_I, _J, _Input, []) ->
ok;
check_sorted(I, J, Input, [A | Rest]) ->
case catch check_sorted1(I, J, A, Rest) of
{'EXIT', _} ->
io:format("~w~n", [Input]),
erlang:error(check_sorted);
Reply ->
Reply
end.
check_sorted1(_I, _J, _A, []) ->
ok;
check_sorted1(I, J, A, [B | Rest]) ->
ok = keycompare(I, J, A, B),
check_sorted1(I, J, B, Rest).
keycompare(I, _J, A, B) when element(I, A) < element(I, B) ->
ok;
keycompare(I, J, A, B) when element(I, A) == element(I, B),
element(J, A) =< element(J, B) ->
ok.
ukeymerge(suite) -> [];
ukeymerge(doc) -> ["Merge two lists while removing duplicates."];
ukeymerge(Conf) when is_list(Conf) ->
Two = [{1,a},{2,b}],
Six = [{1,a},{2,b},{3,c},{4,d},{5,e},{6,f}],
%% 2-way unique keymerge
?line [] = lists:ukeymerge(1, [], []),
?line Two = lists:ukeymerge(1, Two, []),
?line Two = lists:ukeymerge(1, [], Two),
?line [] = lists:ukeymerge(1, [], []),
?line Two = lists:ukeymerge(1, Two, []),
?line Two = lists:ukeymerge(1, [], Two),
?line Six = lists:ukeymerge(1, [{1,a},{3,c},{5,e}], [{2,b},{4,d},{6,f}]),
?line Six = lists:ukeymerge(1, [{2,b},{4,d},{6,f}], [{1,a},{3,c},{5,e}]),
?line Six = lists:ukeymerge(1, [{1,a},{2,b},{3,c}], [{4,d},{5,e},{6,f}]),
?line Six = lists:ukeymerge(1, [{4,d},{5,e},{6,f}], [{1,a},{2,b},{3,c}]),
?line Six = lists:ukeymerge(1, [{1,a},{2,b},{5,e}],[{3,c},{4,d},{6,f}]),
?line [{1,a},{2,b},{3,c},{5,e},{7,g}] =
lists:ukeymerge(1, [{1,a},{3,c},{5,e},{7,g}], [{2,b}]),
?line [{1,a},{2,b},{3,c},{4,d},{5,e},{7,g}] =
lists:ukeymerge(1, [{1,a},{3,c},{5,e},{7,g}], [{2,b},{4,d}]),
?line [{1,a},{2,b},{3,c},{4,d},{5,e},{6,f},{7,g}] =
lists:ukeymerge(1, [{1,a},{3,c},{5,e},{7,g}], [{2,b},{4,d},{6,f}]),
?line [{1,a},{2,b},{3,c},{5,e},{7,g}] =
lists:ukeymerge(1, [{2,b}], [{1,a},{3,c},{5,e},{7,g}]),
?line [{1,a},{2,b},{3,c},{4,d},{5,e},{7,g}] =
lists:ukeymerge(1, [{2,b},{4,d}], [{1,a},{3,c},{5,e},{7,g}]),
?line [{1,a},{2,b},{3,c},{4,d},{5,e},{6,f},{7,g}] =
lists:ukeymerge(1, [{2,b},{4,d},{6,f}], [{1,a},{3,c},{5,e},{7,g}]),
?line [{1,a},{2,b},{3,c},{5,e},{7,g}] =
lists:ukeymerge(1, [{1,a},{2,b},{3,c},{5,e},{7,g}], [{2,b}]),
?line [{1,a},{2,b},{3,c},{4,d},{5,e},{7,g}] =
lists:ukeymerge(1, [{1,a},{2,b},{3,c},{4,d},{5,e},{7,g}],
[{2,b},{4,d}]),
?line [{1,a},{2,b},{3,c},{4,d},{5,e},{6,f},{7,g}] =
lists:ukeymerge(1, [{1,a},{3,c},{5,e},{6,f},{7,g}],
[{2,b},{4,d},{6,f}]),
?line [{1,a},{2,b},{3,c},{5,e},{7,g}] =
lists:ukeymerge(1, [{2,b}], [{1,a},{2,b},{3,c},{5,e},{7,g}]),
?line [{1,a},{2,b},{3,c},{4,d},{5,e},{7,g}] =
lists:ukeymerge(1, [{2,b},{4,d}],
[{1,a},{2,b},{3,c},{4,d},{5,e},{7,g}]),
?line [{1,a},{2,b},{3,c},{4,d},{5,e},{6,f},{7,g}] =
lists:ukeymerge(1, [{2,b},{4,d},{6,f}],
[{1,a},{2,b},{3,c},{4,d},{5,e},{6,f},{7,g}]),
L1 = [{a,1},{a,3},{a,5},{a,7}],
L2 = [{b,1},{b,3},{b,5},{b,7}],
?line L1 = lists:ukeymerge(2, L1, L2),
ok.
rukeymerge(suite) -> [];
rukeymerge(doc) ->
["Reverse merge two lists while removing duplicates."];
rukeymerge(Conf) when is_list(Conf) ->
Two = [{2,b},{1,a}],
Six = [{6,f},{5,e},{4,d},{3,c},{2,b},{1,a}],
%% 2-way reversed unique keymerge
?line [] = lists:rukeymerge(1, [], []),
?line Two = lists:rukeymerge(1, Two, []),
?line Two = lists:rukeymerge(1, [], Two),
?line Six = lists:rukeymerge(1, [{5,e},{3,c},{1,a}], [{6,f},{4,d},{2,b}]),
?line Six = lists:rukeymerge(1, [{6,f},{4,d},{2,b}], [{5,e},{3,c},{1,a}]),
?line Six = lists:rukeymerge(1, [{3,c},{2,b},{1,a}], [{6,f},{5,e},{4,d}]),
?line Six = lists:rukeymerge(1, [{6,f},{5,e},{4,d}], [{3,c},{2,b},{1,a}]),
?line Six = lists:rukeymerge(1, [{4,d},{3,c},{2,b}],[{6,f},{5,e},{1,a}]),
?line [{7,g},{6,f},{5,e},{3,c},{1,a}] =
lists:rukeymerge(1, [{7,g},{5,e},{3,c},{1,a}], [{6,f}]),
?line [{7,g},{6,f},{5,e},{4,d},{3,c},{1,a}] =
lists:rukeymerge(1, [{7,g},{5,e},{3,c},{1,a}], [{6,f},{4,d}]),
?line [{7,g},{6,f},{5,e},{4,d},{3,c},{2,b},{1,a}] =
lists:rukeymerge(1, [{7,g},{5,e},{3,c},{1,a}], [{6,f},{4,d},{2,b}]),
?line [{7,g},{5,e},{3,c},{2,b},{1,a}] =
lists:rukeymerge(1, [{2,b}], [{7,g},{5,e},{3,c},{1,a}]),
?line [{7,g},{5,e},{4,d},{3,c},{2,b},{1,a}] =
lists:rukeymerge(1, [{4,d},{2,b}], [{7,g},{5,e},{3,c},{1,a}]),
?line [{7,g},{6,f},{5,e},{4,d},{3,c},{2,b},{1,a}] =
lists:rukeymerge(1, [{6,f},{4,d},{2,b}], [{7,g},{5,e},{3,c},{1,a}]),
?line [{7,g},{6,f},{5,e},{3,c},{1,a}] =
lists:rukeymerge(1, [{7,g},{6,f},{5,e},{3,c},{1,a}], [{6,f}]),
?line [{7,g},{6,f},{5,e},{4,d},{3,c},{1,a}] =
lists:rukeymerge(1, [{7,g},{6,f},{5,e},{4,d},{3,c},{1,a}],
[{6,f},{4,d}]),
?line [{7,g},{6,f},{5,e},{4,d},{3,c},{2,b},{1,a}] =
lists:rukeymerge(1, [{7,g},{6,f},{5,e},{4,d},{3,c},{2,b},{1,a}],
[{6,f},{4,d},{2,b}]),
?line [{7,g},{5,e},{3,c},{2,b},{1,a}] =
lists:rukeymerge(1, [{2,b}], [{7,g},{5,e},{3,c},{2,b},{1,a}]),
?line [{7,g},{5,e},{4,d},{3,c},{2,b},{1,a}] =
lists:rukeymerge(1, [{4,d},{2,b}],
[{7,g},{5,e},{4,d},{3,c},{2,b},{1,a}]),
?line [{7,g},{6,f},{5,e},{4,d},{3,c},{2,b},{1,a}] =
lists:rukeymerge(1, [{6,f},{4,d},{2,b}],
[{7,g},{6,f},{5,e},{4,d},{3,c},{2,b},{1,a}]),
L1 = [{a,1},{a,3},{a,5},{a,7}],
L2 = [{b,1},{b,3},{b,5},{b,7}],
?line true =
lists:ukeymerge(2, L1, L2) ==
lists:reverse(lists:rukeymerge(2, lists:reverse(L1),
lists:reverse(L2))),
ok.
ukeysort_1(doc) -> ["ukeysort"];
ukeysort_1(suite) -> [];
ukeysort_1(Config) when is_list(Config) ->
?line ok = ukeysort_check(1, [], []),
?line ok = ukeysort_check(1, [{a,b}], [{a,b}]),
?line ok = ukeysort_check(1, [{a,b},{a,b}], [{a,b}]),
?line ok = ukeysort_check(1, [{a,b},{b,c}], [{a,b},{b,c}]),
?line ok = ukeysort_check(1, [{b,c},{a,b}], [{a,b},{b,c}]),
?line ok = ukeysort_check(1,
[{1,e},{3,f},{2,y},{0,z},{x,14}],
[{0,z},{1,e},{2,y},{3,f},{x,14}]),
?line ok = ukeysort_check(1, [{1,a},{1,a},{1,a},{1,a}], [{1,a}]),
L1 = [{1,a},{1,b},{1,a}],
L1u = lists:ukeysort(1, L1),
L2 = [{1,a},{1,b},{1,a}],
L2u = lists:ukeysort(1, L2),
?line ok = ukeysort_check(1, lists:keymerge(1, L1, L2),
lists:ukeymerge(1, L1u, L2u)),
L3 = [{1,a},{1,b},{1,a},{2,a}],
L3u = lists:ukeysort(1, L3),
?line ok = ukeysort_check(1, lists:keymerge(1, L3, L2),
lists:ukeymerge(1, L3u, L2u)),
L4 = [{1,b},{1,a}],
L4u = lists:ukeysort(1, L4),
?line ok = ukeysort_check(1, lists:keymerge(1, L1, L4),
lists:ukeymerge(1, L1u, L4u)),
L5 = [{1,a},{1,b},{1,a},{2,a}],
L5u = lists:ukeysort(1, L5),
?line ok = ukeysort_check(1, lists:keymerge(1, [], L5),
lists:ukeymerge(1, [], L5u)),
?line ok = ukeysort_check(1, lists:keymerge(1, L5, []),
lists:ukeymerge(1, L5u, [])),
L6 = [{3,a}],
L6u = lists:ukeysort(1, L6),
?line ok = ukeysort_check(1, lists:keymerge(1, L5, L6),
lists:ukeymerge(1, L5u, L6u)),
?line [{b,1},{c,1}] = lists:ukeysort(1, [{c,1},{c,1},{c,1},{c,1},{b,1}]),
?line [{a,0},{b,2},{c,3},{d,4}] =
lists:ukeysort(1, [{d,4},{c,3},{b,2},{b,2},{a,0}]),
?line [{a,0},{b,1},{c,1}] =
lists:ukeysort(1, [{c,1},{b,1},{b,1},{b,2},{b,2},{a,0}]),
?line [{a,0},{b,1},{c,1},{d,4}] =
lists:ukeysort(1, [{c,1},{b,1},{b,2},{a,0},{a,0},{d,4},{d,4}]),
SFun = fun(L) -> fun(X) -> ukeysort_check(2, X, L) end end,
PL = [{a,1},{b,2},{c,3},{d,4},{e,5},{f,6}],
Ps = perms([{a,1},{b,2},{c,3},{d,4},{e,5},{f,6},{b,2},{a,1}]),
?line lists:foreach(SFun(PL), Ps),
M1L = [{1,a},{1,a},{2,b}],
M1s = [{1,a},{2,b}],
?line lists:foreach(SFun(M1s), perms(M1L)),
M2L = [{1,a},{2,b},{2,b}],
M2s = [{1,a},{2,b}],
?line lists:foreach(SFun(M2s), perms(M2L)),
M3 = [{1,a},{2,b},{3,c}],
?line lists:foreach(SFun(M3), perms(M3)),
ok.
ukeysort_stable(doc) -> ["ukeysort should keep the first duplicate"];
ukeysort_stable(suite) -> [];
ukeysort_stable(Config) when is_list(Config) ->
?line ok = ukeysort_check(1, [{1,b},{1,c}], [{1,b}]),
?line ok = ukeysort_check(1, [{1,c},{1,b}], [{1,c}]),
?line ok = ukeysort_check(1,
[{1,c},{1,b},{2,x},{3,p},{2,a}],
[{1,c},{2,x},{3,p}]),
?line ok = ukeysort_check(1, [{1,a},{1,b},{1,b}], [{1,a}]),
?line ok = ukeysort_check(1, [{2,a},{1,b},{2,a}], [{1,b},{2,a}]),
?line ok = ukeysort_check_stability(bigfunlist(3)),
?line ok = ukeysort_check_stability(bigfunlist(10)),
?line ok = ukeysort_check_stability(bigfunlist(100)),
?line ok = ukeysort_check_stability(bigfunlist(1000)),
?line case erlang:system_info(modified_timing_level) of
undefined -> ok = ukeysort_check_stability(bigfunlist(10000));
_ -> ok
end,
ok.
ukeysort_error(doc) -> ["ukeysort should exit when given bad arguments"];
ukeysort_error(suite) -> [];
ukeysort_error(Config) when is_list(Config) ->
?line {'EXIT', _} = (catch lists:ukeysort(0, [{1,b},{1,c}])),
?line {'EXIT', _} = (catch lists:ukeysort(3, [{1,b},{1,c}])),
?line {'EXIT', _} = (catch lists:ukeysort(1.5, [{1,b},{1,c}])),
?line {'EXIT', _} = (catch lists:ukeysort(x, [{1,b},{1,c}])),
?line {'EXIT', _} = (catch lists:ukeysort(x, [])),
?line {'EXIT', _} = (catch lists:ukeysort(x, [{1,b}])),
?line {'EXIT', _} = (catch lists:ukeysort(1, [a,b])),
?line {'EXIT', _} = (catch lists:ukeysort(1, [{1,b} | {1,c}])),
ok.
ukeysort_i(doc) -> ["ukeysort with other key than first element"];
ukeysort_i(suite) -> [];
ukeysort_i(Config) when is_list(Config) ->
?line ok = ukeysort_check(2, [{a,2},{b,1},{c,3}], [{b,1},{a,2},{c,3}]),
ok.
ukeysort_rand(doc) -> ["ukeysort on big randomized lists"];
ukeysort_rand(suite) -> [];
ukeysort_rand(Config) when is_list(Config) ->
?line ok = ukeysort_check3(2, biglist(10)),
?line ok = ukeysort_check3(2, biglist(100)),
?line ok = ukeysort_check3(2, biglist(1000)),
?line ok = ukeysort_check3(2, biglist(10000)),
?line ok = gen_ukeysort_check(1, ubiglist(10)),
?line ok = gen_ukeysort_check(1, ubiglist(100)),
?line ok = gen_ukeysort_check(1, ubiglist(1000)),
?line ok = gen_ukeysort_check(1, ubiglist(10000)),
ok.
%% Check that ukeysort/2 is stable and correct relative keysort/2.
%% (this is not affected by the fact that keysort/2 is no longer really
%% stable; ucheck_stability/1 checks ukeysort/2 (and usort/1, of course))
gen_ukeysort_check(I, Input) ->
U = lists:ukeysort(I, Input),
S = lists:keysort(I, Input),
case U == no_dups_keys(S, I) of
true ->
ok;
false ->
io:format("~w~n", [Input]),
erlang:error(gen_ukeysort_check)
end.
%% Used for checking that the first copy is kept.
ukeysort_check_stability(L) ->
I = 1,
U = lists:ukeysort(I, L),
S = no_dups_keys(lkeysort(I, L), I),
check_stab(L, U, S, "ukeysort/2", "usort/2").
%%% Uniquely keysort a list, check that the returned list is what we
%%% expected, and that it is actually sorted.
ukeysort_check(I, Input, Expected) ->
?line Expected = lists:ukeysort(I, Input),
ucheck_sorted(I, Input, Expected).
ukeysort_check3(I, Input) ->
ucheck_sorted(I, 3, Input, lists:ukeysort(I, Input)).
ucheck_sorted(I, Input, L) ->
ucheck_sorted(I, I, Input, L).
%%% Check that a list is ukeysorted by element I. Elements comparing
%%% equal should be sorted according to element J.
ucheck_sorted(_I, _J, _Input, []) ->
ok;
ucheck_sorted(I, J, Input, [A | Rest]) ->
case catch ucheck_sorted1(I, J, A, Rest) of
{'EXIT', _} ->
io:format("~w~n", [Input]),
erlang:error(ucheck_sorted);
Reply ->
Reply
end.
ucheck_sorted1(_I, _J, _A, []) ->
ok;
ucheck_sorted1(I, J, A, [B | Rest]) ->
ok = ukeycompare(I, J, A, B),
ucheck_sorted1(I, J, B, Rest).
ukeycompare(I, _J, A, B) when element(I, A) < element(I, B) ->
ok;
ukeycompare(I, J, A, B) when A =/= B,
element(I, A) == element(I, B),
element(J, A) =< element(J, B) ->
ok.
funmerge(doc) -> ["Merge two lists using a fun."];
funmerge(suite) -> [];
funmerge(Config) when is_list(Config) ->
Two = [1,2],
Six = [1,2,3,4,5,6],
F = fun(X, Y) -> X =< Y end,
%% 2-way merge
?line [] = lists:merge(F, [], []),
?line Two = lists:merge(F, Two, []),
?line Two = lists:merge(F, [], Two),
?line Six = lists:merge(F, [1,3,5], [2,4,6]),
?line Six = lists:merge(F, [2,4,6], [1,3,5]),
?line Six = lists:merge(F, [1,2,3], [4,5,6]),
?line Six = lists:merge(F, [4,5,6], [1,2,3]),
?line Six = lists:merge(F, [1,2,5],[3,4,6]),
?line [1,2,3,5,7] = lists:merge(F, [1,3,5,7], [2]),
?line [1,2,3,4,5,7] = lists:merge(F, [1,3,5,7], [2,4]),
?line [1,2,3,4,5,6,7] = lists:merge(F, [1,3,5,7], [2,4,6]),
?line [1,2,3,5,7] = lists:merge(F, [2], [1,3,5,7]),
?line [1,2,3,4,5,7] = lists:merge(F, [2,4], [1,3,5,7]),
?line [1,2,3,4,5,6,7] = lists:merge(F, [2,4,6], [1,3,5,7]),
F2 = fun(X,Y) -> element(1,X) =< element(1,Y) end,
?line [{b,2},{c,11},{c,12},{c,21},{c,22},{e,5}] =
lists:merge(F2,[{c,11},{c,12},{e,5}], [{b,2},{c,21},{c,22}]),
ok.
rfunmerge(doc) -> ["Reverse merge two lists using a fun."];
rfunmerge(suite) -> [];
rfunmerge(Config) when is_list(Config) ->
Two = [2,1],
Six = [6,5,4,3,2,1],
F = fun(X, Y) -> X =< Y end,
%% 2-way reversed merge
?line [] = lists:rmerge(F, [], []),
?line Two = lists:rmerge(F, Two, []),
?line Two = lists:rmerge(F, [], Two),
?line Six = lists:rmerge(F, [5,3,1], [6,4,2]),
?line Six = lists:rmerge(F, [6,4,2], [5,3,1]),
?line Six = lists:rmerge(F, [3,2,1], [6,5,4]),
?line Six = lists:rmerge(F, [6,5,4], [3,2,1]),
?line Six = lists:rmerge(F, [4,3,2],[6,5,1]),
?line [7,6,5,3,1] = lists:rmerge(F, [7,5,3,1], [6]),
?line [7,6,5,4,3,1] = lists:rmerge(F, [7,5,3,1], [6,4]),
?line [7,6,5,4,3,2,1] = lists:rmerge(F, [7,5,3,1], [6,4,2]),
?line [7,5,3,2,1] = lists:rmerge(F, [2], [7,5,3,1]),
?line [7,5,4,3,2,1] = lists:rmerge(F, [4,2], [7,5,3,1]),
?line [7,6,5,4,3,2,1] = lists:rmerge(F, [6,4,2], [7,5,3,1]),
F2 = fun(X,Y) -> element(1,X) =< element(1,Y) end,
L1 = [{c,11},{c,12},{e,5}],
L2 = [{b,2},{c,21},{c,22}],
?line true =
lists:merge(F2, L1, L2) ==
lists:reverse(lists:rmerge(F2,lists:reverse(L1), lists:reverse(L2))),
ok.
funsort_1(doc) -> ["sort/2"];
funsort_1(suite) -> [];
funsort_1(Config) when is_list(Config) ->
?line ok = funsort_check(1, [], []),
?line ok = funsort_check(1, [{a,b}], [{a,b}]),
?line ok = funsort_check(1, [{a,b},{a,b}], [{a,b},{a,b}]),
?line ok = funsort_check(1, [{a,b},{b,c}], [{a,b},{b,c}]),
?line ok = funsort_check(1, [{b,c},{a,b}], [{a,b},{b,c}]),
?line ok = funsort_check(1,
[{1,e},{3,f},{2,y},{0,z},{x,14}],
[{0,z},{1,e},{2,y},{3,f},{x,14}]),
F = funsort_fun(1),
?line [{b,1},{c,1}] = lists:sort(F, [{c,1},{b,1}]),
?line [{a,0},{b,2},{c,3},{d,4}] =
lists:sort(F, [{d,4},{c,3},{b,2},{a,0}]),
?line [{a,0},{b,1},{b,2},{c,1}] =
lists:sort(F, [{c,1},{b,1},{b,2},{a,0}]),
?line [{a,0},{b,1},{b,2},{c,1},{d,4}] =
lists:sort(F, [{c,1},{b,1},{b,2},{a,0},{d,4}]),
SFun = fun(L) -> fun(X) -> funsort_check(1, X, L) end end,
L1 = [{1,a},{1,a},{2,b},{2,b},{3,c},{4,d},{5,e},{6,f}],
?line lists:foreach(SFun(L1), perms(L1)),
ok.
funsort_stable(doc) -> ["sort/2 should be stable"];
funsort_stable(suite) -> [];
funsort_stable(Config) when is_list(Config) ->
?line ok = funsort_check(1, [{1,b},{1,c}], [{1,b},{1,c}]),
?line ok = funsort_check(1, [{1,c},{1,b}], [{1,c},{1,b}]),
?line ok = funsort_check(1,
[{1,c},{1,b},{2,x},{3,p},{2,a}],
[{1,c},{1,b},{2,x},{2,a},{3,p}]),
ok.
funsort_error(doc) -> ["sort/2 should exit when given bad arguments"];
funsort_error(suite) -> [];
funsort_error(Config) when is_list(Config) ->
?line {'EXIT', _} = (catch lists:sort(1, [{1,b} , {1,c}])),
?line {'EXIT', _} = (catch lists:sort(fun(X,Y) -> X =< Y end,
[{1,b} | {1,c}])),
ok.
funsort_rand(doc) -> ["sort/2 on big randomized lists"];
funsort_rand(suite) -> [];
funsort_rand(Config) when is_list(Config) ->
?line ok = funsort_check3(1, biglist(10)),
?line ok = funsort_check3(1, biglist(100)),
?line ok = funsort_check3(1, biglist(1000)),
?line ok = funsort_check3(1, biglist(10000)),
ok.
% Do a keysort
funsort(I, L) ->
lists:sort(funsort_fun(I), L).
funsort_check3(I, Input) ->
check_sorted(I, 3, Input, funsort(I, Input)).
%%% Keysort a list, check that the returned list is what we expected,
%%% and that it is actually sorted.
funsort_check(I, Input, Expected) ->
?line Expected = funsort(I, Input),
check_sorted(I, Input, Expected).
ufunmerge(suite) -> [];
ufunmerge(doc) -> ["Merge two lists while removing duplicates using a fun."];
ufunmerge(Conf) when is_list(Conf) ->
Two = [1,2],
Six = [1,2,3,4,5,6],
F = fun(X, Y) -> X =< Y end,
%% 2-way unique merge
?line [] = lists:umerge(F, [], []),
?line Two = lists:umerge(F, Two, []),
?line Two = lists:umerge(F, [], Two),
?line Six = lists:umerge(F, [1,3,5], [2,4,6]),
?line Six = lists:umerge(F, [2,4,6], [1,3,5]),
?line Six = lists:umerge(F, [1,2,3], [4,5,6]),
?line Six = lists:umerge(F, [4,5,6], [1,2,3]),
?line Six = lists:umerge(F, [1,2,5],[3,4,6]),
?line [1,2,3,5,7] = lists:umerge(F, [1,3,5,7], [2]),
?line [1,2,3,4,5,7] = lists:umerge(F, [1,3,5,7], [2,4]),
?line [1,2,3,4,5,6,7] = lists:umerge(F, [1,3,5,7], [2,4,6]),
?line [1,2,3,5,7] = lists:umerge(F, [2], [1,3,5,7]),
?line [1,2,3,4,5,7] = lists:umerge(F, [2,4], [1,3,5,7]),
?line [1,2,3,4,5,6,7] = lists:umerge(F, [2,4,6], [1,3,5,7]),
?line [1,2,3,5,7] = lists:umerge(F, [1,2,3,5,7], [2]),
?line [1,2,3,4,5,7] = lists:umerge(F, [1,2,3,4,5,7], [2,4]),
?line [1,2,3,4,5,6,7] = lists:umerge(F, [1,3,5,6,7], [2,4,6]),
?line [1,2,3,5,7] = lists:umerge(F, [2], [1,2,3,5,7]),
?line [1,2,3,4,5,7] = lists:umerge(F, [2,4], [1,2,3,4,5,7]),
?line [1,2,3,4,5,6,7] = lists:umerge(F, [2,4,6], [1,2,3,4,5,6,7]),
L1 = [{a,1},{a,3},{a,5},{a,7}],
L2 = [{b,1},{b,3},{b,5},{b,7}],
F2 = fun(X,Y) -> element(2,X) =< element(2,Y) end,
?line L1 = lists:umerge(F2, L1, L2),
?line [{b,2},{e,5},{c,11},{c,12},{c,21},{c,22}] =
lists:umerge(F2, [{e,5},{c,11},{c,12}], [{b,2},{c,21},{c,22}]),
ok.
rufunmerge(suite) -> [];
rufunmerge(doc) ->
["Reverse merge two lists while removing duplicates using a fun."];
rufunmerge(Conf) when is_list(Conf) ->
Two = [2,1],
Six = [6,5,4,3,2,1],
F = fun(X, Y) -> X =< Y end,
%% 2-way reversed unique merge
?line [] = lists:rumerge(F, [], []),
?line Two = lists:rumerge(F, Two, []),
?line Two = lists:rumerge(F, [], Two),
?line Six = lists:rumerge(F, [5,3,1], [6,4,2]),
?line Six = lists:rumerge(F, [6,4,2], [5,3,1]),
?line Six = lists:rumerge(F, [3,2,1], [6,5,4]),
?line Six = lists:rumerge(F, [6,5,4], [3,2,1]),
?line Six = lists:rumerge(F, [4,3,2],[6,5,1]),
?line [7,6,5,3,1] = lists:rumerge(F, [7,5,3,1], [6]),
?line [7,6,5,4,3,1] = lists:rumerge(F, [7,5,3,1], [6,4]),
?line [7,6,5,4,3,2,1] = lists:rumerge(F, [7,5,3,1], [6,4,2]),
?line [7,5,3,2,1] = lists:rumerge(F, [2], [7,5,3,1]),
?line [7,5,4,3,2,1] = lists:rumerge(F, [4,2], [7,5,3,1]),
?line [7,6,5,4,3,2,1] = lists:rumerge(F, [6,4,2], [7,5,3,1]),
?line [7,6,5,3,1] = lists:rumerge(F, [7,6,5,3,1], [6]),
?line [7,6,5,4,3,1] = lists:rumerge(F, [7,6,5,4,3,1], [6,4]),
?line [7,6,5,4,3,2,1] = lists:rumerge(F, [7,6,5,4,3,2,1], [6,4,2]),
?line [7,5,3,2,1] = lists:rumerge(F, [2], [7,5,3,2,1]),
?line [7,5,4,3,2,1] = lists:rumerge(F, [4,2], [7,5,4,3,2,1]),
?line [7,6,5,4,3,2,1] = lists:rumerge(F, [6,4,2], [7,6,5,4,3,2,1]),
F2 = fun(X,Y) -> element(1,X) =< element(1,Y) end,
L1 = [{1,a},{1,b},{1,a}],
L2 = [{1,a},{1,b},{1,a}],
?line true = lists:umerge(F2, L1, L2) ==
lists:reverse(lists:rumerge(F, lists:reverse(L2), lists:reverse(L1))),
L3 = [{c,11},{c,12},{e,5}],
L4 = [{b,2},{c,21},{c,22}],
?line true =
lists:umerge(F2, L3, L4) ==
lists:reverse(lists:rumerge(F2,lists:reverse(L3), lists:reverse(L4))),
ok.
ufunsort_1(doc) -> ["usort/2"];
ufunsort_1(suite) -> [];
ufunsort_1(Config) when is_list(Config) ->
?line ok = ufunsort_check(1, [], []),
?line ok = ufunsort_check(1, [{a,b}], [{a,b}]),
?line ok = ufunsort_check(1, [{a,b},{a,b}], [{a,b}]),
?line ok = ufunsort_check(1, [{a,b},{b,c}], [{a,b},{b,c}]),
?line ok = ufunsort_check(1, [{b,c},{a,b}], [{a,b},{b,c}]),
?line ok = ufunsort_check(1,
[{1,e},{3,f},{2,y},{0,z},{x,14}],
[{0,z},{1,e},{2,y},{3,f},{x,14}]),
?line ok = ufunsort_check(1,
[{1,a},{2,b},{3,c},{2,b},{1,a},{2,b},{3,c},
{2,b},{1,a}],
[{1,a},{2,b},{3,c}]),
?line ok = ufunsort_check(1,
[{1,a},{1,a},{1,b},{1,b},{1,a},{2,a}],
[{1,a},{2,a}]),
F = funsort_fun(1),
L1 = [{1,a},{1,b},{1,a}],
L2 = [{1,a},{1,b},{1,a}],
?line ok = ufunsort_check(1, lists:keymerge(1, L1, L2),
lists:umerge(F, lists:usort(F, L1),
lists:usort(F, L2))),
L3 = [{1,a},{1,b},{1,a},{2,a}],
?line ok = ufunsort_check(1, lists:keymerge(1, L3, L2),
lists:umerge(F, lists:usort(F, L3),
lists:usort(F, L2))),
L4 = [{1,b},{1,a}],
?line ok = ufunsort_check(1, lists:keymerge(1, L1, L4),
lists:umerge(F, lists:usort(F, L1),
lists:usort(F, L4))),
L5 = [{1,a},{1,b},{1,a},{2,a}],
?line ok = ufunsort_check(1, lists:keymerge(1, L5, []),
lists:umerge(F, lists:usort(F, L5), [])),
L6 = [{3,a}],
?line ok = ufunsort_check(1, lists:keymerge(1, L5, L6),
lists:umerge(F, lists:usort(F, L5),
lists:usort(F, L6))),
?line [{b,1},{c,1}] = lists:usort(F, [{c,1},{c,1},{b,1}]),
?line [{a,0},{b,2},{c,3},{d,4}] =
lists:usort(F, [{d,4},{c,3},{b,2},{b,2},{a,0}]),
?line [{a,0},{b,1},{c,1}] =
lists:usort(F, [{c,1},{b,1},{b,1},{b,2},{b,2},{a,0}]),
?line [{a,0},{b,1},{c,1},{d,4}] =
lists:usort(F, [{c,1},{b,1},{b,2},{a,0},{a,0},{d,4},{d,4}]),
SFun = fun(L) -> fun(X) -> ufunsort_check(1, X, L) end end,
PL = [{1,a},{2,b},{3,c},{4,d},{5,e},{6,f}],
Ps = perms([{1,a},{2,b},{3,c},{4,d},{5,e},{6,f},{2,b},{1,a}]),
?line lists:foreach(SFun(PL), Ps),
ok.
ufunsort_stable(doc) -> ["usort/2 should be stable"];
ufunsort_stable(suite) -> [];
ufunsort_stable(Config) when is_list(Config) ->
?line ok = ufunsort_check(1, [{1,b},{1,c}], [{1,b}]),
?line ok = ufunsort_check(1, [{1,c},{1,b}], [{1,c}]),
?line ok = ufunsort_check(1,
[{1,c},{1,b},{2,x},{3,p},{2,a}],
[{1,c},{2,x},{3,p}]),
?line ok = ufunsort_check_stability(bigfunlist(10)),
?line ok = ufunsort_check_stability(bigfunlist(100)),
?line ok = ufunsort_check_stability(bigfunlist(1000)),
?line case erlang:system_info(modified_timing_level) of
undefined -> ok = ufunsort_check_stability(bigfunlist(10000));
_ -> ok
end,
ok.
ufunsort_error(doc) -> ["usort/2 should exit when given bad arguments"];
ufunsort_error(suite) -> [];
ufunsort_error(Config) when is_list(Config) ->
?line {'EXIT', _} = (catch lists:usort(1, [{1,b} , {1,c}])),
?line {'EXIT', _} = (catch lists:usort(fun(X,Y) -> X =< Y end,
[{1,b} | {1,c}])),
ok.
ufunsort_rand(doc) -> ["usort/2 on big randomized lists"];
ufunsort_rand(suite) -> [];
ufunsort_rand(Config) when is_list(Config) ->
?line ok = ufunsort_check3(1, biglist(10)),
?line ok = ufunsort_check3(1, biglist(100)),
?line ok = ufunsort_check3(1, biglist(1000)),
?line ok = ufunsort_check3(1, biglist(10000)),
?line ok = gen_ufunsort_check(1, ubiglist(100)),
?line ok = gen_ufunsort_check(1, ubiglist(1000)),
?line ok = gen_ufunsort_check(1, ubiglist(10000)),
ok.
%% Check that usort/2 is stable and correct relative sort/2.
gen_ufunsort_check(I, Input) ->
U = ufunsort(I, Input),
S = funsort(I, Input),
case U == no_dups_keys(S, I) of
true ->
ok;
false ->
io:format("~w~n", [Input]),
erlang:error(gen_ufunsort_check)
end.
%% Used for checking that the first copy is kept.
ufunsort_check_stability(L) ->
I = 1,
U = ufunsort(I, L),
S = no_dups(funsort(I, L)),
check_stab(L, U, S, "usort/2", "sort/2").
ufunsort_check3(I, Input) ->
ucheck_sorted(I, 3, Input, ufunsort(I, Input)).
%%% Keysort a list, check that the returned list is what we expected,
%%% and that it is actually sorted.
ufunsort_check(I, Input, Expected) ->
?line Expected = ufunsort(I, Input),
ucheck_sorted(I, Input, Expected).
% Do a keysort
ufunsort(I, L) ->
lists:usort(funsort_fun(I), L).
funsort_fun(I) ->
fun(A, B) when tuple_size(A) >= I, tuple_size(B) >= I ->
element(I, A) =< element(I, B)
end.
check_stab(L, U, S, US, SS) ->
UP = explicit_pid(U),
SP = explicit_pid(S),
case UP == SP of
true ->
ok;
false ->
io:format("In: ~w~n", [explicit_pid(L)]),
io:format("~s: ~w~n", [US, UP]),
io:format("~s: ~w~n", [SS, SP]),
erlang:error(unstable)
end.
%%%------------------------------------------------------------
%%% Generate lists of given length, containing 3-tuples with
%%% random integer elements in the range 0..44 as elements 1 and 2.
%%% Element 3 in the tuple is the position of the tuple in the list.
biglist(N) ->
{A, B, C} = get_seed(),
random:seed(A, B, C),
biglist(N, []).
biglist(0, L) ->
L;
biglist(N, L) ->
E = random_tuple(45, N),
biglist(N-1, [E|L]).
%%%------------------------------------------------------------
%%% Generate lists of given length, containing 2-tuples with
%%% random integer elements in the range 0..10 as element 1.
%%% Element 2 in the tuple is a random integer in the range 0..5.
%%% No sequence number.
ubiglist(N) ->
{A, B, C} = get_seed(),
random:seed(A, B, C),
ubiglist(N, []).
ubiglist(0, L) ->
L;
ubiglist(N, L) ->
E = urandom_tuple(11, 6),
ubiglist(N-1, [E|L]).
urandom_tuple(N, I) ->
R1 = randint(N),
R2 = randint(I),
{R1, R2}.
%%%------------------------------------------------------------
%%% Generate lists of given length, containing 2-tuples with random
%%% integer elements in the range 0..10 as elements 1. All tuples have
%%% the same function as element 2, but every function is created in a
%%% unique process. ==/2 will return 'true' for any pair of functions,
%%% but erlang:fun_info(Fun, pid) can be used for distinguishing
%%% functions created in different processes. The pid acts like a
%%% sequence number.
bigfunlist(N) ->
{A, B, C} = get_seed(),
random:seed(A, B, C),
bigfunlist_1(N).
bigfunlist_1(N) when N < 30000 -> % Now (R8) max 32000 different pids.
case catch bigfunlist(N, 0, []) of
{'EXIT', _} ->
bigfunlist_1(N);
Reply ->
Reply
end.
bigfunlist(0, _P, L) ->
lists:reverse(L);
bigfunlist(N, P, L) ->
{E, NP} = random_funtuple(P, 11),
bigfunlist(N-1, NP, [E | L]).
random_funtuple(P, N) ->
R = randint(N),
F = make_fun(),
NP = fun_pid(F),
true = NP > P,
{{R, F}, NP}.
make_fun() ->
Pid = spawn(?MODULE, make_fun, [self()]),
receive {Pid, Fun} -> Fun end.
make_fun(Pid) ->
Pid ! {self(), fun make_fun/1}.
fun_pid(Fun) ->
erlang:fun_info(Fun, pid).
get_seed() ->
case random:seed() of
undefined ->
erlang:timestamp();
Tuple ->
Tuple
end.
random_tuple(N, Seq) ->
R1 = randint(N),
R2 = randint(N),
{R1, R2, Seq}.
randint(N) ->
trunc(random:uniform() * N).
%% The first "duplicate" is kept.
no_dups([]) ->
[];
no_dups([H | T]) ->
no_dups(H, T, []).
no_dups(H, [H1 | T], L) when H == H1 ->
no_dups(H, T, L);
no_dups(H, [H1 | T], L) ->
no_dups(H1, T, [H | L]);
no_dups(H, [], L) ->
lists:reverse([H | L]).
%% The first "duplicate" is kept.
no_dups_keys([], _I) ->
[];
no_dups_keys([H | T], I) ->
no_dups_keys(H, T, [], I).
no_dups_keys(H, [H1 | T], L, I) when element(I, H) == element(I, H1) ->
no_dups_keys(H, T, L, I);
no_dups_keys(H, [H1 | T], L, I) ->
no_dups_keys(H1, T, [H | L], I);
no_dups_keys(H, [], L, _I) ->
lists:reverse([H | L]).
perms([]) ->
[[]];
perms(L) ->
[[H|T] || H <- L, T <- perms(L--[H])].
%%%------------------------------------------------------------
%%% Test the sort routines with randomly generated lists.
-record(state, {sort = 0, usort = 0, stable = 0}).
%% Run it interactively. 'stop' or 'info' recognized commands.
sort_loop() ->
sort_loop(5000).
sort_loop(N) when is_integer(N), N > 0 ->
Pid = spawn_link(?MODULE, sloop, [N]),
sort_loop_1(Pid).
sort_loop_1(Pid) ->
case io:get_line('? ') of
eof ->
ok;
"stop\n" ->
Pid ! {self(), stop},
receive {Pid, S} -> display_state(S) end;
"info\n" ->
Pid ! {self(), info},
receive {Pid, S} -> display_state(S) end,
sort_loop_1(Pid);
_Other ->
sort_loop_1(Pid)
end.
sloop(N) ->
{A, B, C} = get_seed(),
random:seed(A, B, C),
sloop(N, #state{}).
sloop(N, S) ->
receive
{From, stop} ->
From ! {self(), S};
{From, info} ->
From ! {self(), S},
sloop(N, S)
after 0 ->
Len = randint(N),
NS = case randint(3) of
0 ->
BL = biglist(Len, []),
ok = check(BL),
ok = keysort_check3(1, BL),
ok = funsort_check3(1, BL),
S#state{sort = S#state.sort + 1};
1 ->
BL = ubiglist(Len, []),
ok = ucheck(BL),
ok = gen_ukeysort_check(1, BL),
ok = gen_ufunsort_check(1, BL),
S#state{usort = S#state.usort + 1};
2 ->
BL = bigfunlist(Len),
%% ok = check_stability(BL),
ok = ucheck_stability(BL),
ok = ukeysort_check_stability(BL),
ok = ufunsort_check_stability(BL),
S#state{stable = S#state.stable + 1}
end,
sloop(N, NS)
end.
display_state(S) ->
io:format("sort: ~p~n", [S#state.sort]),
io:format("usort: ~p~n", [S#state.usort]),
io:format("stable: ~p~n", [S#state.stable]).
%% This version of sort/1 is really stable; the order of equal
%% elements is kept. It is used for checking the current
%% implementation of usort/1 etc.
lsort([X, Y | L] = L0) when X =< Y ->
case L of
[] ->
L0;
[Z] when Y =< Z ->
L0;
[Z] when X =< Z ->
[X, Z, Y];
[Z] ->
[Z, X, Y];
_ ->
split_1(X, Y, L, [], [])
end;
lsort([X, Y | L]) ->
case L of
[] ->
[Y, X];
[Z] when X =< Z ->
[Y, X | L];
[Z] when Y =< Z ->
[Y, Z, X];
[Z] ->
[Z, Y, X];
_ ->
split_2(X, Y, L, [], [])
end;
lsort([_] = L) ->
L;
lsort([] = L) ->
L.
split_1(X, Y, [Z | L], R, Rs) when Z >= Y ->
split_1(Y, Z, L, [X | R], Rs);
split_1(X, Y, [Z | L], R, Rs) when Z >= X ->
split_1(Z, Y, L, [X | R], Rs);
split_1(X, Y, [Z | L], [], Rs) ->
split_1(X, Y, L, [Z], Rs);
split_1(X, Y, [Z | L], R, Rs) ->
split_1_1(X, Y, L, R, Rs, Z);
split_1(X, Y, [], R, Rs) ->
rmergel([[Y, X | R] | Rs], [], asc).
split_1_1(X, Y, [Z | L], R, Rs, S) when Z >= Y ->
split_1_1(Y, Z, L, [X | R], Rs, S);
split_1_1(X, Y, [Z | L], R, Rs, S) when Z >= X ->
split_1_1(Z, Y, L, [X | R], Rs, S);
split_1_1(X, Y, [Z | L], R, Rs, S) when S =< Z ->
split_1(S, Z, L, [], [[Y, X | R] | Rs]);
split_1_1(X, Y, [Z | L], R, Rs, S) ->
split_1(Z, S, L, [], [[Y, X | R] | Rs]);
split_1_1(X, Y, [], R, Rs, S) ->
rmergel([[S], [Y, X | R] | Rs], [], asc).
split_2(X, Y, [Z | L], R, Rs) when Z < Y ->
split_2(Y, Z, L, [X | R], Rs);
split_2(X, Y, [Z | L], R, Rs) when Z < X ->
split_2(Z, Y, L, [X | R], Rs);
split_2(X, Y, [Z | L], [], Rs) ->
split_2(X, Y, L, [Z], Rs);
split_2(X, Y, [Z | L], R, Rs) ->
split_2_1(X, Y, L, R, Rs, Z);
split_2(X, Y, [], R, Rs) ->
mergel([[Y, X | R] | Rs], [], desc).
split_2_1(X, Y, [Z | L], R, Rs, S) when Z < Y ->
split_2_1(Y, Z, L, [X | R], Rs, S);
split_2_1(X, Y, [Z | L], R, Rs, S) when Z < X ->
split_2_1(Z, Y, L, [X | R], Rs, S);
split_2_1(X, Y, [Z | L], R, Rs, S) when S > Z ->
split_2(S, Z, L, [], [[Y, X | R] | Rs]);
split_2_1(X, Y, [Z | L], R, Rs, S) ->
split_2(Z, S, L, [], [[Y, X | R] | Rs]);
split_2_1(X, Y, [], R, Rs, S) ->
mergel([[S], [Y, X | R] | Rs], [], desc).
mergel([[] | L], Acc, O) ->
mergel(L, Acc, O);
mergel([T1, [H2 | T2] | L], Acc, asc) ->
mergel(L, [merge2_1(T1, H2, T2, []) | Acc], asc);
mergel([[H2 | T2], T1 | L], Acc, desc) ->
mergel(L, [merge2_1(T1, H2, T2, []) | Acc], desc);
mergel([L], [], _O) ->
L;
mergel([L], Acc, O) ->
rmergel([lists:reverse(L, []) | Acc], [], O);
mergel([], [], _O) ->
[];
mergel([], Acc, O) ->
rmergel(Acc, [], O);
mergel([A, [] | L], Acc, O) ->
mergel([A | L], Acc, O);
mergel([A, B, [] | L], Acc, O) ->
mergel([A, B | L], Acc, O).
rmergel([[H2 | T2], T1 | L], Acc, asc) ->
rmergel(L, [rmerge2_1(T1, H2, T2, []) | Acc], asc);
rmergel([T1, [H2 | T2] | L], Acc, desc) ->
rmergel(L, [rmerge2_1(T1, H2, T2, []) | Acc], desc);
rmergel([L], Acc, O) ->
mergel([lists:reverse(L, []) | Acc], [], O);
rmergel([], Acc, O) ->
mergel(Acc, [], O).
merge2_1([H1 | T1], H2, T2, M) when H1 =< H2 ->
merge2_1(T1, H2, T2, [H1 | M]);
merge2_1([H1 | T1], H2, T2, M) ->
merge2_2(T1, H1, T2, [H2 | M]);
merge2_1([], H2, T2, M) ->
lists:reverse(T2, [H2 | M]).
merge2_2(T1, H1, [H2 | T2], M) when H1 =< H2 ->
merge2_1(T1, H2, T2, [H1 | M]);
merge2_2(T1, H1, [H2 | T2], M) ->
merge2_2(T1, H1, T2, [H2 | M]);
merge2_2(T1, H1, [], M) ->
lists:reverse(T1, [H1 | M]).
rmerge2_1([H1 | T1], H2, T2, M) when H1 =< H2 ->
rmerge2_2(T1, H1, T2, [H2 | M]);
rmerge2_1([H1 | T1], H2, T2, M) ->
rmerge2_1(T1, H2, T2, [H1 | M]);
rmerge2_1([], H2, T2, M) ->
lists:reverse(T2, [H2 | M]).
rmerge2_2(T1, H1, [H2 | T2], M) when H1 =< H2 ->
rmerge2_2(T1, H1, T2, [H2 | M]);
rmerge2_2(T1, H1, [H2 | T2], M) ->
rmerge2_1(T1, H2, T2, [H1 | M]);
rmerge2_2(T1, H1, [], M) ->
lists:reverse(T1, [H1 | M]).
%% This version of keysort/2 is really stable; the order of equal
%% elements is kept. It is used for checking the current
%% implementation of ukeysort/2 etc.
lkeysort(Index, L) when is_integer(Index), Index > 0 ->
case L of
[] -> L;
[_] -> L;
[X, Y | T] ->
EX = element(Index, X),
EY = element(Index, Y),
if
EX =< EY ->
keysplit_1(Index, X, EX, Y, EY, T, [], []);
true ->
keysplit_2(Index, Y, EY, T, [X])
end
end.
keysplit_1(I, X, EX, Y, EY, [Z | L], R, Rs) ->
EZ = element(I, Z),
if
EY =< EZ ->
keysplit_1(I, Y, EY, Z, EZ, L, [X | R], Rs);
EX =< EZ ->
keysplit_1(I, Z, EZ, Y, EY, L, [X | R], Rs);
true, R == [] ->
keysplit_1(I, X, EX, Y, EY, L, [Z], Rs);
true ->
keysplit_1_1(I, X, EX, Y, EY, L, R, Rs, Z, EZ)
end;
keysplit_1(I, X, _EX, Y, _EY, [], R, Rs) ->
rkeymergel(I, [[Y, X | R] | Rs], []).
%% One out-of-order element, S.
keysplit_1_1(I, X, EX, Y, EY, [Z | L], R, Rs, S, ES) ->
EZ = element(I, Z),
if
EY =< EZ ->
keysplit_1_1(I, Y, EY, Z, EZ, L, [X | R], Rs, S, ES);
EX =< EZ ->
keysplit_1_1(I, Z, EZ, Y, EY, L, [X | R], Rs, S, ES);
ES =< EZ ->
keysplit_1(I, S, ES, Z, EZ, L, [], [[Y, X | R] | Rs]);
true ->
keysplit_1(I, Z, EZ, S, ES, L, [], [[Y, X | R] | Rs])
end;
keysplit_1_1(I, X, _EX, Y, _EY, [], R, Rs, S, _ES) ->
rkeymergel(I, [[S], [Y, X | R] | Rs], []).
%% Descending.
keysplit_2(I, Y, EY, [Z | L], R) ->
EZ = element(I, Z),
if
EY =< EZ ->
keysplit_1(I, Y, EY, Z, EZ, L, [], [lists:reverse(R, [])]);
true ->
keysplit_2(I, Z, EZ, L, [Y | R])
end;
keysplit_2(_I, Y, _EY, [], R) ->
[Y | R].
keymergel(I, [T1, [H2 | T2] | L], Acc) ->
keymergel(I, L, [keymerge2_1(I, T1, element(I, H2), H2, T2, []) | Acc]);
keymergel(_I, [L], []) ->
L;
keymergel(I, [L], Acc) ->
rkeymergel(I, [lists:reverse(L, []) | Acc], []);
keymergel(I, [], Acc) ->
rkeymergel(I, Acc, []).
rkeymergel(I, [[H2 | T2], T1 | L], Acc) ->
rkeymergel(I, L, [rkeymerge2_1(I, T1, element(I, H2), H2, T2, []) | Acc]);
rkeymergel(I, [L], Acc) ->
keymergel(I, [lists:reverse(L, []) | Acc], []);
rkeymergel(I, [], Acc) ->
keymergel(I, Acc, []).
keymerge2_1(I, [H1 | T1], E2, H2, T2, M) ->
E1 = element(I, H1),
if
E1 =< E2 ->
keymerge2_1(I, T1, E2, H2, T2, [H1 | M]);
true ->
keymerge2_2(I, T1, E1, H1, T2, [H2 | M])
end;
keymerge2_1(_I, [], _E2, H2, T2, M) ->
lists:reverse(T2, [H2 | M]).
keymerge2_2(I, T1, E1, H1, [H2 | T2], M) ->
E2 = element(I, H2),
if
E1 =< E2 ->
keymerge2_1(I, T1, E2, H2, T2, [H1 | M]);
true ->
keymerge2_2(I, T1, E1, H1, T2, [H2 | M])
end;
keymerge2_2(_I, T1, _E1, H1, [], M) ->
lists:reverse(T1, [H1 | M]).
rkeymerge2_1(I, [H1 | T1], E2, H2, T2, M) ->
E1 = element(I, H1),
if
E1 =< E2 ->
rkeymerge2_2(I, T1, E1, T2, [H2 | M], H1);
true ->
rkeymerge2_1(I, T1, E2, H2, T2, [H1 | M])
end;
rkeymerge2_1(_I, [], _E2, H2, T2, M) ->
lists:reverse(T2, [H2 | M]).
rkeymerge2_2(I, T1, E1, [H2 | T2], M, H1) ->
E2 = element(I, H2),
if
E1 =< E2 ->
rkeymerge2_2(I, T1, E1, T2, [H2 | M], H1);
true ->
rkeymerge2_1(I, T1, E2, H2, T2, [H1 | M])
end;
rkeymerge2_2(_I, T1, _E1, [], M, H1) ->
lists:reverse(T1, [H1 | M]).
%%%------------------------------------------------------------
seq_loop(doc) ->
["Test for infinite loop (OTP-2404)."];
seq_loop(suite) ->
[];
seq_loop(Config) when is_list(Config) ->
?line _ = (catch lists:seq(1, 5, -1)),
ok.
seq_2(doc) ->
["Non-error cases for seq/2"];
seq_2(suite) ->
[];
seq_2(Config) when is_list(Config) ->
?line [1,2,3] = lists:seq(1,3),
?line [1] = lists:seq(1,1),
?line Big = 748274827583793785928592859,
?line Big1 = Big+1,
?line Big2 = Big+2,
?line [Big, Big1, Big2] = lists:seq(Big, Big+2),
ok.
seq_2_e(doc) ->
["Error cases for seq/2"];
seq_2_e(suite) ->
[];
seq_2_e(Config) when is_list(Config) ->
?line seq_error([4, 2]),
?line seq_error([1, a]),
?line seq_error([1.0, 2.0]),
ok.
seq_error(Args) ->
{'EXIT', _} = (catch apply(lists, seq, Args)).
seq_3(doc) ->
["Non-error cases for seq/3"];
seq_3(suite) ->
[];
seq_3(Config) when is_list(Config) ->
?line [1,2,3] = lists:seq(1,3,1),
?line [1] = lists:seq(1,1,1),
?line Big = 748274827583793785928592859,
?line Big1 = Big+1,
?line Big2 = Big+2,
?line [Big, Big1, Big2] = lists:seq(Big, Big+2,1),
?line [3,2,1] = lists:seq(3,1,-1),
?line [1] = lists:seq(1,1,-1),
?line [3,1] = lists:seq(3,1,-2),
?line [1] = lists:seq(1, 10, 10),
?line [1, 4, 7, 10, 13, 16, 19] = lists:seq(1, 19, 3),
?line [1, 4, 7, 10, 13, 16, 19] = lists:seq(1, 20, 3),
?line [1, 4, 7, 10, 13, 16, 19] = lists:seq(1, 21, 3),
?line [1] = lists:seq(1, 1, 0), %OTP-2613
ok.
seq_3_e(doc) ->
["Error cases for seq/3"];
seq_3_e(suite) ->
[];
seq_3_e(Config) when is_list(Config) ->
?line seq_error([4, 2, 1]),
?line seq_error([3, 5, -1]),
?line seq_error([1, a, 1]),
?line seq_error([1.0, 2.0, 1]),
?line seq_error([1, 3, 1.0]),
?line seq_error([1, 3, a]),
?line seq_error([1, 3, 0]),
?line seq_error([a, a, 0]),
ok.
otp_7230(doc) ->
["OTP-7230. seq/1,2 returns the empty list"];
otp_7230(suite) ->
[];
otp_7230(Config) when is_list(Config) ->
From = -10,
To = 10,
StepFrom = -10,
StepTo = 10,
L = lists:seq(From, To),
SL = lists:seq(StepFrom, StepTo),
?line [] =
[{F, T, S} ||
F <- L, T <- L, S <- SL,
not check_seq(F, T, S, catch lists:seq(F, T, S))
orelse
S =:= 1 andalso not check_seq(F, T, S, catch lists:seq(F, T))
].
check_seq(From, To, 0, R) ->
From =:= To andalso R =:= [From]
orelse
From =/= To andalso is_tuple(R) andalso element(1, R) =:= 'EXIT';
check_seq(From, To, Step, []) when Step =/= 0 ->
0 =:= property(From, To, Step)
andalso
(
Step > 0 andalso To < From andalso From-To =< Step
orelse
Step < 0 andalso To > From andalso To-From =< -Step
);
check_seq(From, To, Step, R) when R =/= [], To < From, Step > 0 ->
is_tuple(R) andalso element(1, R) =:= 'EXIT';
check_seq(From, To, Step, R) when R =/= [], To > From, Step < 0 ->
is_tuple(R) andalso element(1, R) =:= 'EXIT';
check_seq(From, To, Step, L) when is_list(L), L =/= [], Step =/= 0 ->
First = hd(L),
Last = lists:last(L),
Min = lists:min(L),
Max = lists:max(L),
[] =:= [E || E <- L, not is_integer(E)]
andalso
%% The difference between two consecutive elements is Step:
begin
LS = [First-Step]++L,
LR = L++[Last+Step],
[Step] =:= lists:usort([B-A || {A,B} <- lists:zip(LS, LR)])
end
andalso
%% The first element of L is From:
From =:= First
andalso
%% No element outside the given interval:
Min >= lists:min([From, To])
andalso
Max =< lists:max([From, To])
andalso
%% All elements are present:
abs(To-Last) < abs(Step)
andalso
length(L) =:= property(From, To, Step);
check_seq(_From, _To, _Step, _R) ->
false.
property(From, To, Step) ->
((To-From+Step) div Step).
%%%------------------------------------------------------------
-define(sublist_error2(X,Y), ?line {'EXIT', _} = (catch lists:sublist(X,Y))).
-define(sublist_error3(X,Y,Z), ?line {'EXIT', _} = (catch lists:sublist(X,Y,Z))).
sublist_2(doc) -> ["sublist/2"];
sublist_2(suite) -> [];
sublist_2(Config) when is_list(Config) ->
?line [] = lists:sublist([], 0),
?line [] = lists:sublist([], 1),
?line [] = lists:sublist([a], 0),
?line [a] = lists:sublist([a], 1),
?line [a] = lists:sublist([a], 2),
?line [a] = lists:sublist([a|b], 1),
?line [a,b] = lists:sublist([a,b|c], 2),
ok.
sublist_2_e(doc) -> ["sublist/2 error cases"];
sublist_2_e(suite) -> [];
sublist_2_e(Config) when is_list(Config) ->
?sublist_error2([], -1),
?sublist_error2(a, -1),
?sublist_error2(a, 0),
?sublist_error2([a|b], 2),
?sublist_error2([a], x),
?sublist_error2([a], 1.5),
?sublist_error2([], x),
?sublist_error2([], 1.5),
ok.
sublist_3(doc) -> ["sublist/3"];
sublist_3(suite) -> [];
sublist_3(Config) when is_list(Config) ->
?line [] = lists:sublist([], 1, 0),
?line [] = lists:sublist([], 1, 1),
?line [] = lists:sublist([a], 1, 0),
?line [a] = lists:sublist([a], 1, 1),
?line [a] = lists:sublist([a], 1, 2),
?line [a] = lists:sublist([a|b], 1, 1),
?line [] = lists:sublist([], 1, 0),
?line [] = lists:sublist([], 1, 1),
?line [] = lists:sublist([a], 1, 0),
?line [a] = lists:sublist([a], 1, 1),
?line [a] = lists:sublist([a], 1, 2),
?line [] = lists:sublist([a], 2, 1),
?line [] = lists:sublist([a], 2, 2),
?line [] = lists:sublist([a], 2, 79),
?line [] = lists:sublist([a,b|c], 1, 0),
?line [] = lists:sublist([a,b|c], 2, 0),
?line [a] = lists:sublist([a,b|c], 1, 1),
?line [b] = lists:sublist([a,b|c], 2, 1),
?line [a,b] = lists:sublist([a,b|c], 1, 2),
?line [] = lists:sublist([a], 2, 0),
ok.
sublist_3_e(doc) -> ["sublist/3 error cases"];
sublist_3_e(suite) -> [];
sublist_3_e(Config) when is_list(Config) ->
?sublist_error3([], 1, -1),
?sublist_error3(a, 1, -1),
?sublist_error3(a, 1, 0),
?sublist_error3([a|b], 1, 2),
?sublist_error3([a], 1, x),
?sublist_error3([a], 1, 1.5),
?sublist_error3([], 1, x),
?sublist_error3([], 1, 1.5),
?sublist_error3([], -1, 0),
?sublist_error3(a, x, -1),
?sublist_error3([a,b], 0.5, 1),
?sublist_error3([a,b], 1.5, 1),
?sublist_error3([a], 1, x),
?sublist_error3([a], 1, 1.5),
?sublist_error3([], 1, x),
?sublist_error3([], 1, 1.5),
?sublist_error3([a], 0, -1),
?sublist_error3([a], 1, -1),
?sublist_error3([a], 2, -1),
?sublist_error3([a], 0, 0),
?sublist_error3([a], 0, 1),
?sublist_error3([a,b|c], 2, 2),
?sublist_error3([a,b|c], 3, 0),
?sublist_error3([a,b|c], 3, 1),
ok.
%%%------------------------------------------------------------
-define(flatten_error1(X), ?line {'EXIT', _} = (catch lists:flatten(X))).
-define(flatten_error2(X,Y), ?line {'EXIT', _} = (catch lists:flatten(X,Y))).
%% Test lists:flatten/1,2 and lists:flatlength/1.
flatten_1(Config) when is_list(Config) ->
[] = lists_flatten([]),
[1,2] = lists_flatten([1,2]),
[1,2] = lists_flatten([1,[2]]),
[1,2] = lists_flatten([[1],2]),
[1,2] = lists_flatten([[1],[2]]),
[1,2] = lists_flatten([[1,2]]),
[a,b,c,d] = lists_flatten([[a],[b,c,[d]]]),
ok.
lists_flatten(List) ->
Flat = lists:flatten(List),
Flat = lists:flatten(List, []),
Len = lists:flatlength(List),
Len = length(Flat),
Flat.
flatten_1_e(doc) -> ["flatten/1 error cases"];
flatten_1_e(suite) -> [];
flatten_1_e(Config) when is_list(Config) ->
?flatten_error1(a),
?flatten_error1([a|b]),
?flatten_error1([[a],[b|c],[d]]),
ok.
%%% [arndt] What if second arg isn't a proper list? This issue isn't
%%% clear-cut. Right now, I think that any term should be allowed.
%%% But I also wish this function didn't exist at all.
%% Test lists:flatten/2.
flatten_2(Config) when is_list(Config) ->
[] = lists:flatten([], []),
[a] = lists:flatten([a], []),
[a,b,c,[no,flatten]] = lists:flatten([[a,[b,c]]], [[no,flatten]]),
ok.
flatten_2_e(doc) -> ["flatten/2 error cases"];
flatten_2_e(suite) -> [];
flatten_2_e(Config) when is_list(Config) ->
ok.
%% Test lists:zip/2, lists:unzip/1.
zip_unzip(Config) when is_list(Config) ->
?line [] = lists:zip([], []),
?line [{a,b}] = lists:zip([a], [b]),
?line [{42.0,{kalle,nisse}},{a,b}] = lists:zip([42.0,a], [{kalle,nisse},b]),
%% Longer lists.
?line SeqA = lists:seq(45, 200),
?line SeqB = [A*A || A <- SeqA],
?line AB = lists:zip(SeqA, SeqB),
?line SeqA = [A || {A,_} <- AB],
?line SeqB = [B || {_,B} <- AB],
?line {SeqA,SeqB} = lists:unzip(AB),
%% Some more unzip/1.
?line {[],[]} = lists:unzip([]),
?line {[a],[b]} = lists:unzip([{a,b}]),
?line {[a,c],[b,d]} = lists:unzip([{a,b},{c,d}]),
%% Error cases.
?line {'EXIT',{function_clause,_}} = (catch lists:zip([], [b])),
?line {'EXIT',{function_clause,_}} = (catch lists:zip([a], [])),
?line {'EXIT',{function_clause,_}} = (catch lists:zip([a], [b,c])),
?line {'EXIT',{function_clause,_}} = (catch lists:zip([a], [b,c])),
ok.
%% Test lists:zip3/3, lists:unzip3/1.
zip_unzip3(Config) when is_list(Config) ->
?line [] = lists:zip3([], [], []),
?line [{a,b,c}] = lists:zip3([a], [b], [c]),
%% Longer lists.
?line SeqA = lists:seq(45, 200),
?line SeqB = [2*A || A <- SeqA],
?line SeqC = [A*A || A <- SeqA],
?line ABC = lists:zip3(SeqA, SeqB, SeqC),
?line SeqA = [A || {A,_,_} <- ABC],
?line SeqB = [B || {_,B,_} <- ABC],
?line SeqC = [C || {_,_,C} <- ABC],
?line {SeqA,SeqB,SeqC} = lists:unzip3(ABC),
%% Some more unzip3/1.
?line {[],[],[]} = lists:unzip3([]),
?line {[a],[b],[c]} = lists:unzip3([{a,b,c}]),
%% Error cases.
?line {'EXIT',{function_clause,_}} = (catch lists:zip3([], [], [c])),
?line {'EXIT',{function_clause,_}} = (catch lists:zip3([], [b], [])),
?line {'EXIT',{function_clause,_}} = (catch lists:zip3([a], [], [])),
ok.
%% Test lists:zipwith/3.
zipwith(Config) when is_list(Config) ->
Zip = fun(A, B) -> [A|B] end,
?line [] = lists:zipwith(Zip, [], []),
?line [[a|b]] = lists:zipwith(Zip, [a], [b]),
%% Longer lists.
?line SeqA = lists:seq(77, 300),
?line SeqB = [A*A || A <- SeqA],
?line AB = lists:zipwith(Zip, SeqA, SeqB),
?line SeqA = [A || [A|_] <- AB],
?line SeqB = [B || [_|B] <- AB],
%% Error cases.
?line {'EXIT',{function_clause,_}} = (catch lists:zipwith(badfun, [], [])),
?line {'EXIT',{function_clause,_}} = (catch lists:zipwith(Zip, [], [b])),
?line {'EXIT',{function_clause,_}} = (catch lists:zipwith(Zip, [a], [])),
?line {'EXIT',{function_clause,_}} = (catch lists:zipwith(Zip, [a], [b,c])),
?line {'EXIT',{function_clause,_}} = (catch lists:zipwith(Zip, [a], [b,c])),
ok.
%% Test lists:zipwith3/4.
zipwith3(Config) when is_list(Config) ->
Zip = fun(A, B, C) -> [A,B,C] end,
?line [] = lists:zipwith3(Zip, [], [], []),
?line [[a,b,c]] = lists:zipwith3(Zip, [a], [b], [c]),
%% Longer lists.
?line SeqA = lists:seq(45, 200),
?line SeqB = [2*A || A <- SeqA],
?line SeqC = [A*A || A <- SeqA],
?line ABC = lists:zipwith3(Zip, SeqA, SeqB, SeqC),
?line SeqA = [A || [A,_,_] <- ABC],
?line SeqB = [B || [_,B,_] <- ABC],
?line SeqC = [C || [_,_,C] <- ABC],
%% Error cases.
?line {'EXIT',{function_clause,_}} = (catch lists:zipwith3(badfun, [], [], [])),
?line {'EXIT',{function_clause,_}} = (catch lists:zipwith3(Zip, [], [], [c])),
?line {'EXIT',{function_clause,_}} = (catch lists:zipwith3(Zip, [], [b], [])),
?line {'EXIT',{function_clause,_}} = (catch lists:zipwith3(Zip, [a], [], [])),
ok.
%% Test lists:filter/2, lists:partition/2.
filter_partition(Config) when is_list(Config) ->
F = fun(I) -> I rem 2 =:= 0 end,
?line filpart(F, [], []),
?line filpart(F, [1], []),
?line filpart(F, [1,3,17], []),
?line filpart(F, [1,2,3,17], [2]),
?line filpart(F, [6,8,1,2,3,17], [6,8,2]),
?line filpart(F, [6,8,1,2,42,3,17], [6,8,2,42]),
%% Error cases.
?line {'EXIT',{function_clause,_}} = (catch lists:filter(badfun, [])),
?line {'EXIT',{function_clause,_}} = (catch lists:partition(badfun, [])),
ok.
filpart(F, All, Exp) ->
Exp = lists:filter(F, All),
Other = lists:filter(fun(E) -> not F(E) end, All),
{Exp,Other} = lists:partition(F, All).
otp_5939(doc) -> ["OTP-5939. Guard tests added."];
otp_5939(suite) -> [];
otp_5939(Config) when is_list(Config) ->
Fun1 = fun(A) -> A end,
Fun2 = fun(A, B) -> {A,B} end,
Fun3 = fun(A, B, C) -> {A,B,C} end,
Pred = fun(_A) -> true end,
Fold = fun(_E, A) -> A end,
MapFold = fun(E, A) -> {E,A} end,
?line {'EXIT', _} = (catch lists:usort( [asd], [qwe])),
?line {'EXIT', _} = (catch lists:zipwith(func, [], [])),
?line [] = lists:zipwith(Fun2, [], []),
?line {'EXIT', _} = (catch lists:zipwith3(func, [], [], [])),
?line [] = lists:zipwith3(Fun3, [], [], []),
?line {'EXIT', _} = (catch lists:keymap(func, 1, [])),
?line {'EXIT', _} = (catch lists:keymap(Fun1, 0, [])),
?line [] = lists:keymap(Fun1, 1, []),
?line {'EXIT', _} = (catch lists:merge(func, [], [1])),
?line {'EXIT', _} = (catch lists:merge(func, [1], [])),
?line [] = lists:merge(Fun2, [], []),
?line {'EXIT', _} = (catch lists:rmerge(func, [], [1])),
?line {'EXIT', _} = (catch lists:rmerge(func, [1], [])),
?line [] = lists:rmerge(Fun2, [], []),
?line {'EXIT', _} = (catch lists:usort(func, [])),
?line {'EXIT', _} = (catch lists:usort(func, [a])),
?line {'EXIT', _} = (catch lists:usort(func, [a, b])),
?line [] = lists:usort(Fun2, []),
?line {'EXIT', _} = (catch lists:umerge(func, [], [1])),
?line {'EXIT', _} = (catch lists:merge(func, [1], [])),
?line [] = lists:umerge(Fun2, [], []),
?line {'EXIT', _} = (catch lists:rumerge(func, [], [1])),
?line {'EXIT', _} = (catch lists:rumerge(func, [1], [])),
?line [] = lists:rumerge(Fun2, [], []),
?line {'EXIT', _} = (catch lists:all(func, [])),
?line true = lists:all(Pred, []),
?line {'EXIT', _} = (catch lists:any(func, [])),
?line false = lists:any(Pred, []),
?line {'EXIT', _} = (catch lists:map(func, [])),
?line [] = lists:map(Fun1, []),
?line {'EXIT', _} = (catch lists:flatmap(func, [])),
?line [] = lists:flatmap(Fun1, []),
?line {'EXIT', _} = (catch lists:foldl(func, [], [])),
?line [] = lists:foldl(Fold, [], []),
?line {'EXIT', _} = (catch lists:foldr(func, [], [])),
?line [] = lists:foldr(Fold, [], []),
?line {'EXIT', _} = (catch lists:filter(func, [])),
?line [] = lists:filter(Pred, []),
?line {'EXIT', _} = (catch lists:partition(func, [])),
?line {[],[]} = lists:partition(Pred, []),
?line {'EXIT', _} = (catch lists:filtermap(func, [])),
?line [] = lists:filtermap(Fun1, []),
?line {'EXIT', _} = (catch lists:foreach(func, [])),
?line ok = lists:foreach(Fun1, []),
?line {'EXIT', _} = (catch lists:mapfoldl(func, [], [])),
?line {[],[]} = lists:mapfoldl(MapFold, [], []),
?line {'EXIT', _} = (catch lists:mapfoldr(func, [], [])),
?line {[],[]} = lists:mapfoldr(MapFold, [], []),
?line {'EXIT', _} = (catch lists:takewhile(func, [])),
?line [] = lists:takewhile(Pred, []),
?line {'EXIT', _} = (catch lists:dropwhile(func, [])),
?line [] = lists:dropwhile(Pred, []),
?line {'EXIT', _} = (catch lists:splitwith(func, [])),
?line {[],[]} = lists:splitwith(Pred, []),
ok.
otp_6023(doc) -> ["OTP-6023. lists:keyreplace/4, a typecheck."];
otp_6023(suite) -> [];
otp_6023(Config) when is_list(Config) ->
?line {'EXIT', _} = (catch lists:keyreplace(a, 2, [{1,a}], b)),
?line [{2,b}] = lists:keyreplace(a, 2, [{1,a}], {2,b}),
ok.
otp_6606(doc) -> ["OTP-6606. sort and keysort bug"];
otp_6606(suite) -> [];
otp_6606(Config) when is_list(Config) ->
I = 1,
F = float(1),
L1 = [{F,I},{F,F},{I,I},{I,F}],
?line L1 = lists:keysort(1, L1),
?line L1 = lists:sort(L1),
L2 = [{I,I},{I,F},{F,I},{F,F}],
?line L2 = lists:keysort(1, L2),
?line L2 = lists:sort(L2),
ok.
%% Test lists:suffix/2.
suffix(Config) when is_list(Config) ->
?line true = lists:suffix([], []),
?line true = lists:suffix([], [a]),
?line true = lists:suffix([], [a,b]),
?line true = lists:suffix([], [a,b,c]),
?line true = lists:suffix([a], lists:duplicate(200000, a)),
?line true = lists:suffix(lists:seq(1, 1024),
lists:seq(2, 64000) ++ lists:seq(1, 1024)),
?line true = lists:suffix(lists:duplicate(20000, a),
lists:duplicate(200000, a)),
?line true = lists:suffix([2.0,3.0], [1.0,2.0,3.0]),
%% False cases.
?line false = lists:suffix([a], []),
?line false = lists:suffix([a,b,c], []),
?line false = lists:suffix([a,b,c], [b,c]),
?line false = lists:suffix([a,b,c], [a,b,c,a,b]),
?line false = lists:suffix(lists:duplicate(199999, a)++[b],
lists:duplicate(200000, a)),
?line false = lists:suffix([2.0,3.0], [1,2,3]),
%% Error cases.
?line {'EXIT',_} = (catch lists:suffix({a,b,c}, [])),
?line {'EXIT',_} = (catch lists:suffix([], {a,b})),
?line {'EXIT',_} = (catch lists:suffix([a|b], [])),
?line {'EXIT',_} = (catch lists:suffix([a,b|c], [a|b])),
?line {'EXIT',_} = (catch lists:suffix([a|b], [a,b|c])),
?line {'EXIT',_} = (catch lists:suffix([a|b], [a|b])),
ok.
%% Test lists:subtract/2 and the '--' operator.
subtract(Config) when is_list(Config) ->
?line [] = sub([], []),
?line [] = sub([], [a]),
?line [] = sub([], lists:seq(1, 1024)),
?line sub_non_matching([a], []),
?line sub_non_matching([1,2], [make_ref()]),
?line sub_non_matching(lists:seq(1, 1024), [make_ref(),make_ref()]),
%% Matching subtracts.
?line [] = sub([a], [a]),
?line [a] = sub([a,b], [b]),
?line [a] = sub([a,b], [b,c]),
?line [a] = sub([a,b,c], [b,c]),
?line [a] = sub([a,b,c], [b,c]),
?line [d,a,a] = sub([a,b,c,d,a,a], [a,b,c]),
?line [d,x,a] = sub([a,b,c,d,a,x,a], [a,b,c,a]),
?line [1,2,3,4,5,6,7,8,9,9999,10000,20,21,22] =
sub(lists:seq(1, 10000)++[20,21,22], lists:seq(10, 9998)),
%% Floats/integers.
?line [42.0,42.0] = sub([42.0,42,42.0], [42,42,42]),
?line [1,2,3,4,43.0] = sub([1,2,3,4,5,42.0,43.0], [42.0,5]),
%% Crashing subtracts.
?line {'EXIT',_} = (catch sub([], [a|b])),
?line {'EXIT',_} = (catch sub([a], [a|b])),
?line {'EXIT',_} = (catch sub([a|b], [])),
?line {'EXIT',_} = (catch sub([a|b], [])),
?line {'EXIT',_} = (catch sub([a|b], [a])),
%% Trapping, both crashing and otherwise.
[sub_trapping(N) || N <- lists:seq(0, 18)],
%% The current implementation chooses which algorithm to use based on
%% certain thresholds, and we need proper coverage for all corner cases.
[sub_thresholds(N) || N <- lists:seq(0, 32)],
ok.
sub_non_matching(A, B) ->
A = sub(A, B).
sub(A, B) ->
Res = A -- B,
Res = lists:subtract(A, B).
sub_trapping(N) ->
List = lists:duplicate(N + (1 bsl N), gurka),
ImproperList = List ++ crash,
{'EXIT',_} = (catch sub_trapping_1(ImproperList, [])),
{'EXIT',_} = (catch sub_trapping_1(List, ImproperList)),
List = List -- lists:duplicate(N + (1 bsl N), gaffel),
ok = sub_trapping_1(List, []).
sub_trapping_1([], _) -> ok;
sub_trapping_1(L, R) -> sub_trapping_1(L -- R, [gurka | R]).
sub_thresholds(N) ->
%% This needs to be long enough to cause trapping.
OtherLen = 1 bsl 18,
Other = lists:seq(0, OtherLen - 1),
Disjoint = lists:seq(-N, -1),
Subset = lists:seq(1, N),
%% LHS is disjoint from RHS, so all elements must be retained.
Disjoint = Disjoint -- Other,
%% LHS is covered by RHS, so all elements must be removed.
[] = Subset -- Other,
%% RHS is disjoint from LHS, so all elements must be retained.
Other = Other -- Disjoint,
%% RHS is covered by LHS, so N elements must be removed.
N = OtherLen - length(Other -- Subset),
ok.
%% Test lists:droplast/1
droplast(Config) when is_list(Config) ->
?line [] = lists:droplast([x]),
?line [x] = lists:droplast([x, y]),
?line {'EXIT', {function_clause, _}} = (catch lists:droplast([])),
?line {'EXIT', {function_clause, _}} = (catch lists:droplast(x)),
ok.
%% Briefly test the common high-order functions to ensure they
%% are covered.
hof(Config) when is_list(Config) ->
L = [1,2,3],
[1,4,9] = lists:map(fun(N) -> N*N end, L),
[1,4,5,6] = lists:flatmap(fun(1) -> [1];
(2) -> [];
(3) -> [4,5,6]
end, L),
[{1,[a]},{2,[b]},{3,[c]}] =
lists:keymap(fun(A) -> [A] end, 2, [{1,a},{2,b},{3,c}]),
[1,3] = lists:filter(fun(N) -> N rem 2 =:= 1 end, L),
FilterMapFun = fun(1) -> true;
(2) -> {true,42};
(3) -> false
end,
[1,42] = lists:filtermap(FilterMapFun, L),
[1,42] = lists:zf(FilterMapFun, L),
[3,2,1] = lists:foldl(fun(E, A) -> [E|A] end, [], L),
[1,2,3] = lists:foldr(fun(E, A) -> [E|A] end, [], L),
{[1,4,9],[3,2,1]} = lists:mapfoldl(fun(E, A) ->
{E*E,[E|A]}
end, [], L),
{[1,4,9],[1,2,3]} = lists:mapfoldr(fun(E, A) ->
{E*E,[E|A]}
end, [], L),
true = lists:any(fun(N) -> N =:= 2 end, L),
false = lists:any(fun(N) -> N =:= 42 end, L),
true = lists:all(fun(N) -> is_integer(N) end, L),
false = lists:all(fun(N) -> N rem 2 =:= 0 end, L),
ok.
