%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2004-2010. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
-module(match_SUITE).
-export([all/1,
pmatch/1,mixed/1,aliases/1,match_in_call/1,
untuplify/1,shortcut_boolean/1,letify_guard/1,
selectify/1,underscore/1]).
-include("test_server.hrl").
all(suite) ->
test_lib:recompile(?MODULE),
[pmatch,mixed,aliases,match_in_call,untuplify,shortcut_boolean,
letify_guard,selectify,underscore].
pmatch(Config) when is_list(Config) ->
?line ok = doit(1),
?line ok = doit(2),
?line {error,baz} = doit(3),
?line {error,foobar} = doit(4),
ok.
%% Thanks to Tobias Lindahl (HiPE).
-define(FOO(X),
case X of
1 -> foo;
2 -> bar;
3 -> baz;
4 -> foobar
end).
doit(X) ->
case ?FOO(X) of
foo -> ok;
bar -> ok;
Other -> {error, Other}
end.
mixed(Config) when is_list(Config) ->
?line glufs = mixit(1),
?line klafs = mixit(2),
?line fnurra = mixit(3),
?line usch = mixit(4),
?line {error,blurf} = mixit(5),
?line {error,87987987} = mixit(6),
?line {error,{a,b,c}} = mixit(7),
ok.
mixit(X) ->
case case X of
1 -> a;
2 -> b;
3 -> 42;
4 -> 77;
5 -> blurf;
6 -> 87987987;
7 -> {a,b,c}
end of
a -> glufs;
b -> klafs;
42 -> fnurra;
77 -> usch;
Other -> {error,Other}
end.
aliases(Config) when is_list(Config) ->
%% Lists/strings.
?line ok = str_alias("abc"),
?line ok = str_alias("def"),
?line ok = str_alias("ghi"),
?line ok = str_alias("klm"),
?line ok = str_alias("qrs"),
?line ok = str_alias("xy"),
?line ok = str_alias(""),
?line ok = str_alias([]),
?line error = str_alias("blurf"),
%% Characters/integers.
?line ok = char_alias($v),
?line ok = char_alias(118),
?line ok = char_alias($w),
?line ok = char_alias(119),
?line ok = char_alias(42),
?line ok = char_alias(3.0),
?line error = char_alias($_),
?line error = char_alias(0),
?line {42,42,42} = three(42),
?line {1,42,99,1,42,99} = tuple_alias({1,42,99}),
?line {-10,20,-10,20,-10,20} = tuple_alias({-10,20}),
?line 6 = tup_lit_alias({1,2,3}),
?line 6 = tup_lit_alias_rev({1,2,3}),
?line {42,42,42,42} = multiple_aliases_1(42),
?line {7,7,7} = multiple_aliases_2(7),
?line {{a,b},{a,b},{a,b}} = multiple_aliases_3({a,b}),
%% Lists/literals.
?line {a,b} = list_alias1([a,b]),
?line {a,b} = list_alias2([a,b]),
?line {a,b} = list_alias3([a,b]),
ok.
str_alias(V) ->
Res = str_alias_1(V),
Res = str_alias_2(V).
str_alias_1([$a,$b,$c]="abc"="a"++[$b,$c]=[97,98,99]) -> ok;
str_alias_1([$d|"ef"]="def") -> ok;
str_alias_1([$g|"hi"]="g"++"hi"="gh"++"i"="ghi"++"") -> ok;
str_alias_1("k"++"lm"=[$k|"lm"]) -> ok;
str_alias_1([113,114,115]="qrs"=[$q,$r,$s]="q"++"r"++"s") -> ok;
str_alias_1([$x,$y]="xy") -> ok;
str_alias_1(""=[]) -> ok;
str_alias_1(_) -> error.
%% Make sure that different line numbers do not matter.
str_alias_2([$a,$b,$c]=
"abc"=
"a"++[$b,$c
]=
[97,98,99
]) -> ok;
str_alias_2([$d|"ef"]=
"def") -> ok;
str_alias_2([$g|"hi"]=
"g"++"hi"=
"gh"++"i"=
"ghi"++"") -> ok;
str_alias_2("k"++"lm"=
[$k|"lm"
]) -> ok;
str_alias_2([113,114,115]=
"qrs"=[$q,$r,$s
]=
"q"++"r"++"s") -> ok;
str_alias_2([$x,$y]=
"xy") -> ok;
str_alias_2(""=
[]) -> ok;
str_alias_2(_) -> error.
char_alias(V) ->
Res = char_alias_1(V),
Res = char_alias_2(V).
char_alias_1(118=$v) -> ok;
char_alias_1($w=119) -> ok;
char_alias_1(42=42) -> ok;
char_alias_1(3.0=3.0) -> ok;
char_alias_1(_) -> error.
char_alias_2(118=
$v) -> ok;
char_alias_2($w=
119) -> ok;
char_alias_2(42=
42) -> ok;
char_alias_2(3.0=
3.0) -> ok;
char_alias_2(_) -> error.
three(V) ->
Res = three_1(V),
Res = three_2(V).
three_1(A=B=C) ->
{A,B,C}.
three_2(A=
B=
C) ->
{A,B,C}.
tuple_alias({A,B,C}={X,Y,Z}) ->
{A,B,C,X,Y,Z};
tuple_alias({A,B}={C,D}={E,F}) ->
{A,B,C,D,E,F}.
tup_lit_alias({A,B,C}={1,2,3}) ->
A+B+C.
tup_lit_alias_rev({1,2,3}={A,B,C}) ->
A+B+C.
multiple_aliases_1((A=B)=(C=D)) ->
{A,B,C,D}.
multiple_aliases_2((A=B)=(A=C)) ->
{A,B,C}.
multiple_aliases_3((A={_,_}=B)={_,_}=C) ->
{A,B,C}.
list_alias1([a,b]=[X,Y]) ->
{X,Y}.
list_alias2([X,Y]=[a,b]) ->
{X,Y}.
list_alias3([X,b]=[a,Y]) ->
{X,Y}.
%% OTP-7018.
match_in_call(Config) when is_list(Config) ->
?line mac_a(0),
?line mac_b(1),
?line mac_c(42),
?line mac_d(42),
?line mac_e({gurka,42}),
?line [{2,2},{2,2}] = mac_lc([{2,any},{2,2}]),
?line {'EXIT',_} = (catch mac_lc([{1,1}])),
ok.
mac_a(X) ->
id(_Gurka = {gurka,X}),
ok.
mac_b(X) ->
id(Gurka = {gurka,X}),
gurka(Gurka, X),
ok.
mac_c(X) ->
id(Gurka = Yxa = {gurka,X}),
id({Gurka,Yxa}),
ok.
mac_d(X) ->
id({gurka,42} = {gurka,X}),
ok.
mac_e(X) ->
id({gurka,42} = X),
ok.
mac_lc(E) ->
Res = mac_lc1(E),
Res = mac_lc2(E).
mac_lc1(E) ->
[{X,Y} ||
{X,_} <- E,
(Y = X) =:= (Y = 1 + 1)].
mac_lc2(E) ->
[{X,Y} ||
{X,_} <- E,
(Y = X) =:= (Y = 2)].
gurka({gurka,X}, X) -> ok.
untuplify(Config) when is_list(Config) ->
%% We do this to cover sys_core_fold:unalias_pat/1.
?line {1,2,3,4,alias,{[1,2],{3,4},alias}} = untuplify_1([1,2], {3,4}, alias),
?line error = untuplify_1([1,2], {3,4}, 42),
ok.
untuplify_1(A, B, C) ->
case {A,B,C} of
{[X,Y],{Z,W},alias=Alias}=Top ->
{X,Y,Z,W,Alias,Top};
[_,_]=CantMatch ->
CantMatch;
_ ->
error
end.
%% Coverage of beam_dead:shortcut_boolean_label/4.
shortcut_boolean(Config) when is_list(Config) ->
?line false = shortcut_boolean_1([0]),
?line true = shortcut_boolean_1({42}),
?line maybe = shortcut_boolean_1(self()),
?line {'EXIT',_} = (catch shortcut_boolean_1([a,b])),
?line {'EXIT',_} = (catch shortcut_boolean_1({a,b})),
ok.
shortcut_boolean_1(X) ->
Outer = case not is_pid(X) of
true ->
V = case X of
[_] -> true;
{_} -> false
end,
not V;
false ->
maybe
end,
id(Outer).
%% Test sys_core_fold:letify_guard/3.
letify_guard(Config) when is_list(Config) ->
?line {-15,a} = letify_guard(-15, a),
?line 5 = letify_guard(2, 3),
ok.
letify_guard(A, B) ->
case {A,B} of
%% The tuple will be built in the guard...
Z when tuple_size(Z) =:= 2, element(1, Z) < 0 ->
%% ... and again here.
Z;
{X,Y} -> X+Y
end.
%% Test combining of is_eq_exact instructions to select_val
%% instructions in beam_dead and beam_peep.
selectify(Config) when is_list(Config) ->
?line integer = sel_different_types({r,42}),
?line atom = sel_different_types({r,forty_two}),
?line none = sel_different_types({r,18}),
?line {'EXIT',_} = (catch sel_different_types([a,b,c])),
?line integer = sel_same_value({r,42}),
?line error = sel_same_value({r,100}),
?line error = sel_same_value(a),
?line integer42 = sel_same_value2(42),
?line integer43 = sel_same_value2(43),
?line error = sel_same_value2(44),
ok.
sel_different_types({r,_}=T) when element(2, T) =:= forty_two ->
atom;
sel_different_types({r,_}=T) when element(2, T) =:= 42 ->
integer;
sel_different_types({r,_}) ->
none.
sel_same_value({r,V}) when V =:= 42 ->
integer;
sel_same_value({r,V}) when V =:= 42 ->
integer42;
sel_same_value(_) ->
error.
sel_same_value2(V) when V =:= 42 ->
integer42;
sel_same_value2(V) when V =:= 42; V =:= 43 ->
integer43;
sel_same_value2(_) ->
error.
underscore(Config) when is_list(Config) ->
case Config of
[] ->
%% Assignment to _ at the end of a construct.
_ = length(Config);
[_|_] ->
%% Assignment to _ at the end of a construct.
_ = list_to_tuple(Config)
end,
_ = is_list(Config),
ok.
id(I) -> I.
