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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.
%%
%% Copyright (C) 2004-2016 Richard Carlsson, Mickaël Rémond
-ifndef(ASSERT_HRL).
-define(ASSERT_HRL, true).
%% Asserts are enabled unless NOASSERT is defined, and ASSERT can be used to
%% override it: if both ASSERT and NOASSERT are defined, then ASSERT takes
%% precedence, and NOASSERT will become undefined.
%%
%% Furthermore, if NODEBUG is defined, it implies NOASSERT, unless DEBUG or
%% ASSERT are defined.
%%
%% If asserts are disabled, all assert macros are defined to be the atom
%% 'ok'. If asserts are enabled, all assert macros are defined to yield 'ok'
%% as the result if the test succeeds, and raise an error exception if the
%% test fails. The error term will then have the form {Name, Info} where
%% Name is the name of the macro and Info is a list of tagged tuples.
%% allow NODEBUG to imply NOASSERT, unless DEBUG
-ifdef(NODEBUG).
-ifndef(DEBUG).
-ifndef(NOASSERT).
-define(NOASSERT, true).
-endif.
-endif.
-endif.
%% allow ASSERT to override NOASSERT
-ifdef(ASSERT).
-undef(NOASSERT).
-endif.
%% Assert macros must not depend on any non-kernel or stdlib libraries.
%%
%% We must use fun-call wrappers ((fun () -> ... end)()) to avoid
%% exporting local variables, and furthermore we only use variable names
%% prefixed with "__", that hopefully will not be bound outside the fun.
%% It is not possible to nest assert macros.
-ifdef(NOASSERT).
-define(assert(BoolExpr),ok).
-else.
%% The assert macro is written the way it is so as not to cause warnings
%% for clauses that cannot match, even if the expression is a constant or
%% is known to be boolean-only.
-define(assert(BoolExpr),
begin
((fun () ->
__T = is_process_alive(self()), % cheap source of truth
case (BoolExpr) of
__T -> ok;
__V -> erlang:error({assert,
[{module, ?MODULE},
{line, ?LINE},
{expression, (??BoolExpr)},
{expected, true},
case not __T of
__V -> {value, false};
_ -> {not_boolean, __V}
end]})
end
end)())
end).
-endif.
%% This is the inverse case of assert, for convenience.
-ifdef(NOASSERT).
-define(assertNot(BoolExpr),ok).
-else.
-define(assertNot(BoolExpr),
begin
((fun () ->
__F = not is_process_alive(self()),
case (BoolExpr) of
__F -> ok;
__V -> erlang:error({assert,
[{module, ?MODULE},
{line, ?LINE},
{expression, (??BoolExpr)},
{expected, false},
case not __F of
__V -> {value, true};
_ -> {not_boolean, __V}
end]})
end
end)())
end).
-endif.
%% This is mostly a convenience which gives more detailed reports.
%% Note: Guard is a guarded pattern, and can not be used for value.
-ifdef(NOASSERT).
-define(assertMatch(Guard, Expr), ok).
-else.
-define(assertMatch(Guard, Expr),
begin
((fun () ->
case (Expr) of
Guard -> ok;
__V -> erlang:error({assertMatch,
[{module, ?MODULE},
{line, ?LINE},
{expression, (??Expr)},
{pattern, (??Guard)},
{value, __V}]})
end
end)())
end).
-endif.
%% This is the inverse case of assertMatch, for convenience.
-ifdef(NOASSERT).
-define(assertNotMatch(Guard, Expr), ok).
-else.
-define(assertNotMatch(Guard, Expr),
begin
((fun () ->
__V = (Expr),
case __V of
Guard -> erlang:error({assertNotMatch,
[{module, ?MODULE},
{line, ?LINE},
{expression, (??Expr)},
{pattern, (??Guard)},
{value, __V}]});
_ -> ok
end
end)())
end).
-endif.
%% This is a convenience macro which gives more detailed reports when
%% the expected LHS value is not a pattern, but a computed value
-ifdef(NOASSERT).
-define(assertEqual(Expect, Expr), ok).
-else.
-define(assertEqual(Expect, Expr),
begin
((fun () ->
__X = (Expect),
case (Expr) of
__X -> ok;
__V -> erlang:error({assertEqual,
[{module, ?MODULE},
{line, ?LINE},
{expression, (??Expr)},
{expected, __X},
{value, __V}]})
end
end)())
end).
-endif.
%% This is the inverse case of assertEqual, for convenience.
-ifdef(NOASSERT).
-define(assertNotEqual(Unexpected, Expr), ok).
-else.
-define(assertNotEqual(Unexpected, Expr),
begin
((fun () ->
__X = (Unexpected),
case (Expr) of
__X -> erlang:error({assertNotEqual,
[{module, ?MODULE},
{line, ?LINE},
{expression, (??Expr)},
{value, __X}]});
_ -> ok
end
end)())
end).
-endif.
%% Note: Class and Term are patterns, and can not be used for value.
%% Term can be a guarded pattern, but Class cannot.
-ifdef(NOASSERT).
-define(assertException(Class, Term, Expr), ok).
-else.
-define(assertException(Class, Term, Expr),
begin
((fun () ->
try (Expr) of
__V -> erlang:error({assertException,
[{module, ?MODULE},
{line, ?LINE},
{expression, (??Expr)},
{pattern,
"{ "++(??Class)++" , "++(??Term)
++" , [...] }"},
{unexpected_success, __V}]})
catch
Class:Term -> ok;
__C:__T ->
erlang:error({assertException,
[{module, ?MODULE},
{line, ?LINE},
{expression, (??Expr)},
{pattern,
"{ "++(??Class)++" , "++(??Term)
++" , [...] }"},
{unexpected_exception,
{__C, __T,
erlang:get_stacktrace()}}]})
end
end)())
end).
-endif.
-define(assertError(Term, Expr), ?assertException(error, Term, Expr)).
-define(assertExit(Term, Expr), ?assertException(exit, Term, Expr)).
-define(assertThrow(Term, Expr), ?assertException(throw, Term, Expr)).
%% This is the inverse case of assertException, for convenience.
%% Note: Class and Term are patterns, and can not be used for value.
%% Both Class and Term can be guarded patterns.
-ifdef(NOASSERT).
-define(assertNotException(Class, Term, Expr), ok).
-else.
-define(assertNotException(Class, Term, Expr),
begin
((fun () ->
try (Expr) of
_ -> ok
catch
__C:__T ->
case __C of
Class ->
case __T of
Term ->
erlang:error({assertNotException,
[{module, ?MODULE},
{line, ?LINE},
{expression, (??Expr)},
{pattern,
"{ "++(??Class)++" , "
++(??Term)++" , [...] }"},
{unexpected_exception,
{__C, __T,
erlang:get_stacktrace()
}}]});
_ -> ok
end;
_ -> ok
end
end
end)())
end).
-endif.
-endif. % ASSERT_HRL
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