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%%% -*- erlang-indent-level: 2 -*-
%%%-------------------------------------------------------------------
%%% Author: Kostis Sagonas
%%%
%%% Contains code examples that test pattern matching against terms of
%%% various types.
%%%-------------------------------------------------------------------
-module(basic_pattern_match).
-export([test/0]).
test() ->
ok = test_hello_world(),
ok = test_list_plus_plus_match(),
ok.
%%--------------------------------------------------------------------
%% Trivial test to test pattern matching compilation with atoms, the
%% correct handling of all sorts of alphanumeric types in Erlang, and
%% conversions between them.
test_hello_world() ->
String = gimme(string),
String = atom_to_list(gimme(atom)),
String = binary_to_list(gimme(binary)),
true = (list_to_atom(String) =:= gimme(atom)),
true = (list_to_binary(String) =:= gimme(binary)),
ok.
gimme(string) ->
"hello world";
gimme(atom) ->
'hello world';
gimme(binary) ->
<<"hello world">>.
%%--------------------------------------------------------------------
%% Makes sure that pattern matching expressions involving ++ work OK.
%% The third expression caused a problem in the Erlang shell of R11B-5.
%% It worked OK in both interpreted and compiled code.
test_list_plus_plus_match() ->
ok = (fun("X" ++ _) -> ok end)("X"),
ok = (fun([$X | _]) -> ok end)("X"),
ok = (fun([$X] ++ _) -> ok end)("X"),
ok.
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