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abseil-cpp/absl/flags/flag_test.cc

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//
// Copyright 2019 The Abseil Authors.
//
// 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
//
// https://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.
#include "absl/flags/flag.h"
#include <algorithm>
#include <string>
#include "gtest/gtest.h"
#include "absl/flags/usage_config.h"
#include "absl/strings/match.h"
#include "absl/strings/numbers.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_split.h"
ABSL_DECLARE_FLAG(int64_t, mistyped_int_flag);
ABSL_DECLARE_FLAG(std::vector<std::string>, mistyped_string_flag);
namespace {
namespace flags = absl::flags_internal;
std::string TestHelpMsg() { return "dynamic help"; }
template <typename T>
void* TestMakeDflt() {
return new T{};
}
void TestCallback() {}
template <typename T>
bool TestConstructionFor() {
constexpr flags::HelpInitArg help_arg{flags::FlagHelpSrc("literal help"),
flags::FlagHelpSrcKind::kLiteral};
constexpr flags::Flag<T> f1("f1", help_arg, "file",
&flags::FlagMarshallingOps<T>, &TestMakeDflt<T>);
EXPECT_EQ(f1.Name(), "f1");
EXPECT_EQ(f1.Help(), "literal help");
EXPECT_EQ(f1.Filename(), "file");
ABSL_CONST_INIT static flags::Flag<T> f2(
"f2",
{flags::FlagHelpSrc(&TestHelpMsg), flags::FlagHelpSrcKind::kGenFunc},
"file", &flags::FlagMarshallingOps<T>, &TestMakeDflt<T>);
flags::FlagRegistrar<T, false>(&f2).OnUpdate(TestCallback);
EXPECT_EQ(f2.Name(), "f2");
EXPECT_EQ(f2.Help(), "dynamic help");
EXPECT_EQ(f2.Filename(), "file");
return true;
}
struct UDT {
UDT() = default;
UDT(const UDT&) = default;
};
bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
std::string AbslUnparseFlag(const UDT&) { return ""; }
class FlagTest : public testing::Test {
protected:
static void SetUpTestSuite() {
// Install a function to normalize filenames before this test is run.
absl::FlagsUsageConfig default_config;
default_config.normalize_filename = &FlagTest::NormalizeFileName;
absl::SetFlagsUsageConfig(default_config);
}
private:
static std::string NormalizeFileName(absl::string_view fname) {
#ifdef _WIN32
std::string normalized(fname);
std::replace(normalized.begin(), normalized.end(), '\\', '/');
fname = normalized;
#endif
return std::string(fname);
}
};
TEST_F(FlagTest, TestConstruction) {
TestConstructionFor<bool>();
TestConstructionFor<int16_t>();
TestConstructionFor<uint16_t>();
TestConstructionFor<int32_t>();
TestConstructionFor<uint32_t>();
TestConstructionFor<int64_t>();
TestConstructionFor<uint64_t>();
TestConstructionFor<double>();
TestConstructionFor<float>();
TestConstructionFor<std::string>();
TestConstructionFor<UDT>();
}
// --------------------------------------------------------------------
} // namespace
ABSL_DECLARE_FLAG(bool, test_flag_01);
ABSL_DECLARE_FLAG(int, test_flag_02);
ABSL_DECLARE_FLAG(int16_t, test_flag_03);
ABSL_DECLARE_FLAG(uint16_t, test_flag_04);
ABSL_DECLARE_FLAG(int32_t, test_flag_05);
ABSL_DECLARE_FLAG(uint32_t, test_flag_06);
ABSL_DECLARE_FLAG(int64_t, test_flag_07);
ABSL_DECLARE_FLAG(uint64_t, test_flag_08);
ABSL_DECLARE_FLAG(double, test_flag_09);
ABSL_DECLARE_FLAG(float, test_flag_10);
ABSL_DECLARE_FLAG(std::string, test_flag_11);
namespace {
#if !ABSL_FLAGS_STRIP_NAMES
TEST_F(FlagTest, TestFlagDeclaration) {
// test that we can access flag objects.
EXPECT_EQ(FLAGS_test_flag_01.Name(), "test_flag_01");
EXPECT_EQ(FLAGS_test_flag_02.Name(), "test_flag_02");
EXPECT_EQ(FLAGS_test_flag_03.Name(), "test_flag_03");
EXPECT_EQ(FLAGS_test_flag_04.Name(), "test_flag_04");
EXPECT_EQ(FLAGS_test_flag_05.Name(), "test_flag_05");
EXPECT_EQ(FLAGS_test_flag_06.Name(), "test_flag_06");
EXPECT_EQ(FLAGS_test_flag_07.Name(), "test_flag_07");
EXPECT_EQ(FLAGS_test_flag_08.Name(), "test_flag_08");
EXPECT_EQ(FLAGS_test_flag_09.Name(), "test_flag_09");
EXPECT_EQ(FLAGS_test_flag_10.Name(), "test_flag_10");
EXPECT_EQ(FLAGS_test_flag_11.Name(), "test_flag_11");
}
#endif // !ABSL_FLAGS_STRIP_NAMES
// --------------------------------------------------------------------
} // namespace
ABSL_FLAG(bool, test_flag_01, true, "test flag 01");
ABSL_FLAG(int, test_flag_02, 1234, "test flag 02");
ABSL_FLAG(int16_t, test_flag_03, -34, "test flag 03");
ABSL_FLAG(uint16_t, test_flag_04, 189, "test flag 04");
ABSL_FLAG(int32_t, test_flag_05, 10765, "test flag 05");
ABSL_FLAG(uint32_t, test_flag_06, 40000, "test flag 06");
ABSL_FLAG(int64_t, test_flag_07, -1234567, "test flag 07");
ABSL_FLAG(uint64_t, test_flag_08, 9876543, "test flag 08");
ABSL_FLAG(double, test_flag_09, -9.876e-50, "test flag 09");
ABSL_FLAG(float, test_flag_10, 1.234e12f, "test flag 10");
ABSL_FLAG(std::string, test_flag_11, "", "test flag 11");
namespace {
#if !ABSL_FLAGS_STRIP_NAMES
TEST_F(FlagTest, TestFlagDefinition) {
absl::string_view expected_file_name = "absl/flags/flag_test.cc";
EXPECT_EQ(FLAGS_test_flag_01.Name(), "test_flag_01");
EXPECT_EQ(FLAGS_test_flag_01.Help(), "test flag 01");
EXPECT_TRUE(absl::EndsWith(FLAGS_test_flag_01.Filename(), expected_file_name))
<< FLAGS_test_flag_01.Filename();
EXPECT_EQ(FLAGS_test_flag_02.Name(), "test_flag_02");
EXPECT_EQ(FLAGS_test_flag_02.Help(), "test flag 02");
EXPECT_TRUE(absl::EndsWith(FLAGS_test_flag_02.Filename(), expected_file_name))
<< FLAGS_test_flag_02.Filename();
EXPECT_EQ(FLAGS_test_flag_03.Name(), "test_flag_03");
EXPECT_EQ(FLAGS_test_flag_03.Help(), "test flag 03");
EXPECT_TRUE(absl::EndsWith(FLAGS_test_flag_03.Filename(), expected_file_name))
<< FLAGS_test_flag_03.Filename();
EXPECT_EQ(FLAGS_test_flag_04.Name(), "test_flag_04");
EXPECT_EQ(FLAGS_test_flag_04.Help(), "test flag 04");
EXPECT_TRUE(absl::EndsWith(FLAGS_test_flag_04.Filename(), expected_file_name))
<< FLAGS_test_flag_04.Filename();
EXPECT_EQ(FLAGS_test_flag_05.Name(), "test_flag_05");
EXPECT_EQ(FLAGS_test_flag_05.Help(), "test flag 05");
EXPECT_TRUE(absl::EndsWith(FLAGS_test_flag_05.Filename(), expected_file_name))
<< FLAGS_test_flag_05.Filename();
EXPECT_EQ(FLAGS_test_flag_06.Name(), "test_flag_06");
EXPECT_EQ(FLAGS_test_flag_06.Help(), "test flag 06");
EXPECT_TRUE(absl::EndsWith(FLAGS_test_flag_06.Filename(), expected_file_name))
<< FLAGS_test_flag_06.Filename();
EXPECT_EQ(FLAGS_test_flag_07.Name(), "test_flag_07");
EXPECT_EQ(FLAGS_test_flag_07.Help(), "test flag 07");
EXPECT_TRUE(absl::EndsWith(FLAGS_test_flag_07.Filename(), expected_file_name))
<< FLAGS_test_flag_07.Filename();
EXPECT_EQ(FLAGS_test_flag_08.Name(), "test_flag_08");
EXPECT_EQ(FLAGS_test_flag_08.Help(), "test flag 08");
EXPECT_TRUE(absl::EndsWith(FLAGS_test_flag_08.Filename(), expected_file_name))
<< FLAGS_test_flag_08.Filename();
EXPECT_EQ(FLAGS_test_flag_09.Name(), "test_flag_09");
EXPECT_EQ(FLAGS_test_flag_09.Help(), "test flag 09");
EXPECT_TRUE(absl::EndsWith(FLAGS_test_flag_09.Filename(), expected_file_name))
<< FLAGS_test_flag_09.Filename();
EXPECT_EQ(FLAGS_test_flag_10.Name(), "test_flag_10");
EXPECT_EQ(FLAGS_test_flag_10.Help(), "test flag 10");
EXPECT_TRUE(absl::EndsWith(FLAGS_test_flag_10.Filename(), expected_file_name))
<< FLAGS_test_flag_10.Filename();
EXPECT_EQ(FLAGS_test_flag_11.Name(), "test_flag_11");
EXPECT_EQ(FLAGS_test_flag_11.Help(), "test flag 11");
EXPECT_TRUE(absl::EndsWith(FLAGS_test_flag_11.Filename(), expected_file_name))
<< FLAGS_test_flag_11.Filename();
}
#endif // !ABSL_FLAGS_STRIP_NAMES
// --------------------------------------------------------------------
TEST_F(FlagTest, TestDefault) {
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), true);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 1234);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), -34);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 189);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), 10765);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 40000);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -1234567);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 9876543);
EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), -9.876e-50, 1e-55);
EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), 1.234e12f, 1e5f);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "");
}
// --------------------------------------------------------------------
TEST_F(FlagTest, TestGetSet) {
absl::SetFlag(&FLAGS_test_flag_01, false);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), false);
absl::SetFlag(&FLAGS_test_flag_02, 321);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 321);
absl::SetFlag(&FLAGS_test_flag_03, 67);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), 67);
absl::SetFlag(&FLAGS_test_flag_04, 1);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 1);
absl::SetFlag(&FLAGS_test_flag_05, -908);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), -908);
absl::SetFlag(&FLAGS_test_flag_06, 4001);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 4001);
absl::SetFlag(&FLAGS_test_flag_07, -23456);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -23456);
absl::SetFlag(&FLAGS_test_flag_08, 975310);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 975310);
absl::SetFlag(&FLAGS_test_flag_09, 1.00001);
EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), 1.00001, 1e-10);
absl::SetFlag(&FLAGS_test_flag_10, -3.54f);
EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), -3.54f, 1e-6f);
absl::SetFlag(&FLAGS_test_flag_11, "asdf");
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "asdf");
}
// --------------------------------------------------------------------
int GetDflt1() { return 1; }
} // namespace
ABSL_FLAG(int, test_flag_12, GetDflt1(), "test flag 12");
ABSL_FLAG(std::string, test_flag_13, absl::StrCat("AAA", "BBB"),
"test flag 13");
namespace {
TEST_F(FlagTest, TestNonConstexprDefault) {
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_12), 1);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_13), "AAABBB");
}
// --------------------------------------------------------------------
} // namespace
ABSL_FLAG(bool, test_flag_14, true, absl::StrCat("test ", "flag ", "14"));
namespace {
#if !ABSL_FLAGS_STRIP_HELP
TEST_F(FlagTest, TestNonConstexprHelp) {
EXPECT_EQ(FLAGS_test_flag_14.Help(), "test flag 14");
}
#endif //! ABSL_FLAGS_STRIP_HELP
// --------------------------------------------------------------------
int cb_test_value = -1;
void TestFlagCB();
} // namespace
ABSL_FLAG(int, test_flag_with_cb, 100, "").OnUpdate(TestFlagCB);
ABSL_FLAG(int, test_flag_with_lambda_cb, 200, "").OnUpdate([]() {
cb_test_value = absl::GetFlag(FLAGS_test_flag_with_lambda_cb) +
absl::GetFlag(FLAGS_test_flag_with_cb);
});
namespace {
void TestFlagCB() { cb_test_value = absl::GetFlag(FLAGS_test_flag_with_cb); }
// Tests side-effects of callback invocation.
TEST_F(FlagTest, CallbackInvocation) {
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_with_cb), 100);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_with_lambda_cb), 200);
EXPECT_EQ(cb_test_value, 300);
absl::SetFlag(&FLAGS_test_flag_with_cb, 1);
EXPECT_EQ(cb_test_value, 1);
absl::SetFlag(&FLAGS_test_flag_with_lambda_cb, 3);
EXPECT_EQ(cb_test_value, 4);
}
// --------------------------------------------------------------------
struct CustomUDT {
CustomUDT() : a(1), b(1) {}
CustomUDT(int a_, int b_) : a(a_), b(b_) {}
friend bool operator==(const CustomUDT& f1, const CustomUDT& f2) {
return f1.a == f2.a && f1.b == f2.b;
}
int a;
int b;
};
bool AbslParseFlag(absl::string_view in, CustomUDT* f, std::string*) {
std::vector<absl::string_view> parts =
absl::StrSplit(in, ':', absl::SkipWhitespace());
if (parts.size() != 2) return false;
if (!absl::SimpleAtoi(parts[0], &f->a)) return false;
if (!absl::SimpleAtoi(parts[1], &f->b)) return false;
return true;
}
std::string AbslUnparseFlag(const CustomUDT& f) {
return absl::StrCat(f.a, ":", f.b);
}
} // namespace
ABSL_FLAG(CustomUDT, test_flag_15, CustomUDT(), "test flag 15");
namespace {
TEST_F(FlagTest, TestCustomUDT) {
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_15), CustomUDT(1, 1));
absl::SetFlag(&FLAGS_test_flag_15, CustomUDT(2, 3));
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_15), CustomUDT(2, 3));
}
// MSVC produces link error on the type mismatch.
// Linux does not have build errors and validations work as expected.
#if 0 // !defined(_WIN32) && GTEST_HAS_DEATH_TEST
TEST(Flagtest, TestTypeMismatchValidations) {
// For builtin types, GetFlag() only does validation in debug mode.
EXPECT_DEBUG_DEATH(
absl::GetFlag(FLAGS_mistyped_int_flag),
"Flag 'mistyped_int_flag' is defined as one type and declared "
"as another");
EXPECT_DEATH(absl::SetFlag(&FLAGS_mistyped_int_flag, 0),
"Flag 'mistyped_int_flag' is defined as one type and declared "
"as another");
EXPECT_DEATH(absl::GetFlag(FLAGS_mistyped_string_flag),
"Flag 'mistyped_string_flag' is defined as one type and "
"declared as another");
EXPECT_DEATH(
absl::SetFlag(&FLAGS_mistyped_string_flag, std::vector<std::string>{}),
"Flag 'mistyped_string_flag' is defined as one type and declared as "
"another");
}
#endif
// --------------------------------------------------------------------
// A contrived type that offers implicit and explicit conversion from specific
// source types.
struct ConversionTestVal {
ConversionTestVal() = default;
explicit ConversionTestVal(int a_in) : a(a_in) {}
enum class ViaImplicitConv { kTen = 10, kEleven };
// NOLINTNEXTLINE
ConversionTestVal(ViaImplicitConv from) : a(static_cast<int>(from)) {}
int a;
};
bool AbslParseFlag(absl::string_view in, ConversionTestVal* val_out,
std::string*) {
if (!absl::SimpleAtoi(in, &val_out->a)) {
return false;
}
return true;
}
std::string AbslUnparseFlag(const ConversionTestVal& val) {
return absl::StrCat(val.a);
}
} // namespace
// Flag default values can be specified with a value that converts to the flag
// value type implicitly.
ABSL_FLAG(ConversionTestVal, test_flag_16,
ConversionTestVal::ViaImplicitConv::kTen, "test flag 16");
namespace {
TEST_F(FlagTest, CanSetViaImplicitConversion) {
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_16).a, 10);
absl::SetFlag(&FLAGS_test_flag_16,
ConversionTestVal::ViaImplicitConv::kEleven);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_16).a, 11);
}
// --------------------------------------------------------------------
struct NonDfltConstructible {
public:
// This constructor tests that we can initialize the flag with int value
NonDfltConstructible(int i) : value(i) {} // NOLINT
// This constructor tests that we can't initialize the flag with char value
// but can with explicitly constructed NonDfltConstructible.
explicit NonDfltConstructible(char c) : value(100 + static_cast<int>(c)) {}
int value;
};
bool AbslParseFlag(absl::string_view in, NonDfltConstructible* ndc_out,
std::string*) {
return absl::SimpleAtoi(in, &ndc_out->value);
}
std::string AbslUnparseFlag(const NonDfltConstructible& ndc) {
return absl::StrCat(ndc.value);
}
} // namespace
ABSL_FLAG(NonDfltConstructible, ndc_flag1, NonDfltConstructible('1'),
"Flag with non default constructible type");
ABSL_FLAG(NonDfltConstructible, ndc_flag2, 0,
"Flag with non default constructible type");
namespace {
TEST_F(FlagTest, TestNonDefaultConstructibleType) {
EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag1).value, '1' + 100);
EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag2).value, 0);
absl::SetFlag(&FLAGS_ndc_flag1, NonDfltConstructible('A'));
absl::SetFlag(&FLAGS_ndc_flag2, 25);
EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag1).value, 'A' + 100);
EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag2).value, 25);
}
// --------------------------------------------------------------------
struct Wrapper {
Wrapper() {}
// NOLINTNEXTLINE(runtime/explicit)
Wrapper(const std::string& val) : val(val) {}
// NOLINTNEXTLINE(runtime/explicit)
template <typename T>
Wrapper(T&& t) : val(std::forward<T>(t)) {}
// NOLINTNEXTLINE(runtime/explicit)
operator std::string() const& { return val; }
std::string val;
};
} // namespace
ABSL_RETIRED_FLAG(bool, old_bool_flag, true, "old descr");
ABSL_RETIRED_FLAG(int, old_int_flag, (int)std::sqrt(10), "old descr");
ABSL_RETIRED_FLAG(std::string, old_str_flag, "", absl::StrCat("old ", "descr"));
ABSL_RETIRED_FLAG(Wrapper, old_wrapper_flag, {}, "old wrapper");
ABSL_RETIRED_FLAG(Wrapper, old_wrapper_no_default_flag, ,
"old wrapper no default");
namespace {
TEST_F(FlagTest, TestRetiredFlagRegistration) {
bool is_bool = false;
EXPECT_TRUE(flags::IsRetiredFlag("old_bool_flag", &is_bool));
EXPECT_TRUE(is_bool);
EXPECT_TRUE(flags::IsRetiredFlag("old_int_flag", &is_bool));
EXPECT_FALSE(is_bool);
EXPECT_TRUE(flags::IsRetiredFlag("old_str_flag", &is_bool));
EXPECT_FALSE(is_bool);
EXPECT_TRUE(flags::IsRetiredFlag("old_wrapper_flag", &is_bool));
EXPECT_FALSE(is_bool);
EXPECT_TRUE(flags::IsRetiredFlag("old_wrapper_no_default_flag", &is_bool));
EXPECT_FALSE(is_bool);
EXPECT_FALSE(flags::IsRetiredFlag("some_other_flag", &is_bool));
}
} // namespace