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authorRichard Carlsson <[email protected]>2014-12-23 14:23:35 +0100
committerRichard Carlsson <[email protected]>2015-05-22 12:43:53 +0200
commite533ea29e80a641f247022f321a3bf1a1456c56e (patch)
tree2681e4a828e5393d1cc5c539efd5285b92419fa2 /lib/syntax_tools/examples/merl/lisp_test.erl
parent9a81b28598fadc44bf506354c9227e41aac786f6 (diff)
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Include Merl in Syntax Tools
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+%% ---------------------------------------------------------------------
+%% 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.
+%%
+%% @author Richard Carlsson <[email protected]>
+%% @copyright 2012 Richard Carlsson
+%% @doc Tests. For including in another module.
+
+%-module(lisp_test).
+%-import(lisp, eval/1)
+
+-export([fib/1, lisp_fib/1]).
+
+-include_lib("eunit/include/eunit.hrl").
+
+basics_test_() ->
+ [?_assertEqual(42, eval(42)),
+ ?_assertEqual("hello", eval([quote, "hello"])),
+ ?_assertEqual(print, eval([quote, print])),
+ ?_assertMatch([17,[1,2],42], eval([list,17,[list,1,2],42])),
+ ?_assertEqual([], eval([print, [quote, "hello ~w"], [list, 42]])),
+ ?_assertEqual(5, eval([plus, 2, 3])),
+ ?_assertEqual(5, eval([plus, 8, -3])),
+ ?_assertEqual([], eval([equal, 0, 1])),
+ ?_assertEqual(1, eval([equal, 1, 1])),
+ ?_assertEqual([], eval([gt, 0, 1])),
+ ?_assertEqual([], eval([gt, 1, 1])),
+ ?_assertEqual(1, eval([gt, 2, 1])),
+ ?_assertEqual([], eval([knot, 42])),
+ ?_assertEqual(1, eval([knot, []])),
+ ?_assertEqual(42, eval([do, 17, 42])),
+ ?_assertEqual([], eval([apply, print, [quote, ["~p", [42]]]])),
+ ?_assertEqual(42, eval([iff, [], 17, 42])),
+ ?_assertEqual(17, eval([iff, 1, 17, 42])),
+ ?_assertEqual(42, eval([iff, [], [apply], 42])),
+ ?_assertEqual(17, eval([iff, 1, 17, [apply]])),
+ ?_assertEqual(17, eval([def, foo, 17, foo])),
+ ?_assertEqual(17, eval([def, bar, 42, [def, foo, 17, foo]])),
+ ?_assertEqual(42, eval([def, bar, 42, [def, foo, 17, bar]])),
+ ?_assertEqual(17, eval([def, foo, 42, [def, foo, 17, foo]]))
+ ].
+
+-ifdef(INTERPRETED).
+interpreter_basics_test_() ->
+ [?_assertThrow({undefined, foo}, eval(foo)),
+ ?_assertMatch({builtin,_}, eval(print)),
+ ?_assertThrow(bad_do, eval([do])),
+ ?_assertThrow(bad_apply, eval([apply])),
+ ?_assertThrow({undefined, foo}, eval([def, bar, 17, foo]))
+ ].
+
+interpreter_lambda_test_() ->
+ [?_assertMatch({lambda,_,_,_}, eval([lambda, [], 42])),
+ ?_assertMatch({lambda,_,_,_}, eval([lambda, [x], x])),
+ ?_assertMatch({lambda,_,_,_}, eval([lambda, [x,y], 42]))
+ ].
+-endif.
+
+lambda_test_() ->
+ [?_assertThrow(bad_lambda, eval([lambda])),
+ ?_assertThrow(bad_lambda, eval([lambda, []])),
+ ?_assertThrow(bad_lambda, eval([lambda, [], 17, 42])),
+ ?_assertThrow(bad_lambda, eval([lambda, 17, 42])),
+ ?_assertThrow(bad_lambda, eval([lambda, [17], 42])),
+ ?_assertThrow(bad_lambda, eval([lambda, [foo, foo], 42])),
+ ?_assertEqual(42, eval([[lambda, [x], x], 42])),
+ ?_assertEqual([42, 17], eval([[lambda, [x], [list, x, 17]], 42])),
+ ?_assertEqual([42, 17], eval([def, f, [def, y, 42,
+ [lambda, [x], [list, y, x]]],
+ [f, 17]]))
+ ].
+
+fib_test_() ->
+ [?_assertEqual(fib(N), lisp_fib(N)) || N <- lists:seq(1,15)
+ ].
+
+
+fib(N) when N > 1 ->
+ fib(N-1) + fib(N-2);
+fib(_) ->
+ 1.
+
+lisp_fib(N) ->
+ eval([def, fib,
+ [y, [lambda, [f], [lambda, [x],
+ [iff, [gt, x, 1],
+ [plus, [f, [plus,x,-1]], [f, [plus,x,-2]]],
+ 1]
+ ]]],
+ [fib, N]
+ ]).