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fmt/test/format-test.cc
Mart Slot 0aa4721472 Compile-time error on too many arguments provided 
Adds a compile time error if the number of arguments provided to the
format function is larger than the number of braces in the format
string.
Only works in automatic argument indexing mode.

This check deliberately only works for compile-time format string
checking, not at runtime. This is because we don't want existing code to
have unexpected runtime errors after upgrades. There are also scenarios
imaginable where either the arguments or the format string is generated
at runtime, and the ability to have less braces in the format string can
actually be a feature. At the same time, compile-time format calls are
guaranteed to be constant. In other words, having too many arguments will
always mean there's a bug in the code.

The new feature works by adding a on_end_of_string() function to
formatting handlers. This function is called after the whole format
string has been parsed, and needs to be implemented by all parsing
handlers.
2019-09-24 08:44:01 +00:00

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// Formatting library for C++ - formatting library tests
//
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.
#include <stdint.h>
#include <cctype>
#include <cfloat>
#include <climits>
#include <cmath>
#include <cstring>
#include <list>
#include <memory>
#include <string>
// Check if fmt/format.h compiles with windows.h included before it.
#ifdef _WIN32
# include <windows.h>
#endif
#include "fmt/color.h"
#include "fmt/format.h"
#include "gmock.h"
#include "gtest-extra.h"
#include "mock-allocator.h"
#include "util.h"
#undef ERROR
#undef min
#undef max
using std::size_t;
using fmt::basic_memory_buffer;
using fmt::internal::basic_writer;
using fmt::internal::max_value;
using fmt::format;
using fmt::format_error;
using fmt::memory_buffer;
using fmt::string_view;
using fmt::wmemory_buffer;
using testing::Return;
using testing::StrictMock;
namespace {
#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 408
template <typename Char, typename T> bool check_enabled_formatter() {
static_assert(std::is_default_constructible<fmt::formatter<T, Char>>::value,
"");
return true;
}
template <typename Char, typename... T> void check_enabled_formatters() {
auto dummy = {check_enabled_formatter<Char, T>()...};
(void)dummy;
}
TEST(FormatterTest, TestFormattersEnabled) {
check_enabled_formatters<char, bool, char, signed char, unsigned char, short,
unsigned short, int, unsigned, long, unsigned long,
long long, unsigned long long, float, double,
long double, void*, const void*, char*, const char*,
std::string, std::nullptr_t>();
check_enabled_formatters<wchar_t, bool, wchar_t, signed char, unsigned char,
short, unsigned short, int, unsigned, long,
unsigned long, long long, unsigned long long, float,
double, long double, void*, const void*, wchar_t*,
const wchar_t*, std::wstring, std::nullptr_t>();
}
#endif
// Format value using the standard library.
template <typename Char, typename T>
void std_format(const T& value, std::basic_string<Char>& result) {
std::basic_ostringstream<Char> os;
os << value;
result = os.str();
}
#ifdef __MINGW32__
// Workaround a bug in formatting long double in MinGW.
void std_format(long double value, std::string& result) {
char buffer[100];
safe_sprintf(buffer, "%Lg", value);
result = buffer;
}
void std_format(long double value, std::wstring& result) {
wchar_t buffer[100];
swprintf(buffer, L"%Lg", value);
result = buffer;
}
#endif
// Checks if writing value to BasicWriter<Char> produces the same result
// as writing it to std::basic_ostringstream<Char>.
template <typename Char, typename T>
::testing::AssertionResult check_write(const T& value, const char* type) {
fmt::basic_memory_buffer<Char> buffer;
using range = fmt::buffer_range<Char>;
basic_writer<range> writer(buffer);
writer.write(value);
std::basic_string<Char> actual = to_string(buffer);
std::basic_string<Char> expected;
std_format(value, expected);
if (expected == actual) return ::testing::AssertionSuccess();
return ::testing::AssertionFailure()
<< "Value of: (Writer<" << type << ">() << value).str()\n"
<< " Actual: " << actual << "\n"
<< "Expected: " << expected << "\n";
}
struct AnyWriteChecker {
template <typename T>
::testing::AssertionResult operator()(const char*, const T& value) const {
::testing::AssertionResult result = check_write<char>(value, "char");
return result ? check_write<wchar_t>(value, "wchar_t") : result;
}
};
template <typename Char> struct WriteChecker {
template <typename T>
::testing::AssertionResult operator()(const char*, const T& value) const {
return check_write<Char>(value, "char");
}
};
// Checks if writing value to BasicWriter produces the same result
// as writing it to std::ostringstream both for char and wchar_t.
#define CHECK_WRITE(value) EXPECT_PRED_FORMAT1(AnyWriteChecker(), value)
#define CHECK_WRITE_CHAR(value) EXPECT_PRED_FORMAT1(WriteChecker<char>(), value)
#define CHECK_WRITE_WCHAR(value) \
EXPECT_PRED_FORMAT1(WriteChecker<wchar_t>(), value)
} // namespace
struct uint32_pair {
uint32_t u[2];
};
TEST(UtilTest, BitCast) {
auto s = fmt::internal::bit_cast<uint32_pair>(uint64_t{42});
EXPECT_EQ(fmt::internal::bit_cast<uint64_t>(s), 42ull);
s = fmt::internal::bit_cast<uint32_pair>(uint64_t(~0ull));
EXPECT_EQ(fmt::internal::bit_cast<uint64_t>(s), ~0ull);
}
TEST(UtilTest, Increment) {
char s[10] = "123";
increment(s);
EXPECT_STREQ("124", s);
s[2] = '8';
increment(s);
EXPECT_STREQ("129", s);
increment(s);
EXPECT_STREQ("130", s);
s[1] = s[2] = '9';
increment(s);
EXPECT_STREQ("200", s);
}
TEST(UtilTest, ParseNonnegativeInt) {
if (max_value<int>() !=
static_cast<int>(static_cast<unsigned>(1) << 31)) {
fmt::print("Skipping parse_nonnegative_int test\n");
return;
}
fmt::string_view s = "10000000000";
auto begin = s.begin(), end = s.end();
EXPECT_THROW_MSG(
parse_nonnegative_int(begin, end, fmt::internal::error_handler()),
fmt::format_error, "number is too big");
s = "2147483649";
begin = s.begin();
end = s.end();
EXPECT_THROW_MSG(
parse_nonnegative_int(begin, end, fmt::internal::error_handler()),
fmt::format_error, "number is too big");
}
TEST(IteratorTest, CountingIterator) {
fmt::internal::counting_iterator<char> it;
auto prev = it++;
EXPECT_EQ(prev.count(), 0);
EXPECT_EQ(it.count(), 1);
}
TEST(IteratorTest, TruncatingIterator) {
char* p = nullptr;
fmt::internal::truncating_iterator<char*> it(p, 3);
auto prev = it++;
EXPECT_EQ(prev.base(), p);
EXPECT_EQ(it.base(), p + 1);
}
TEST(IteratorTest, TruncatingBackInserter) {
std::string buffer;
auto bi = std::back_inserter(buffer);
fmt::internal::truncating_iterator<decltype(bi)> it(bi, 2);
*it++ = '4';
*it++ = '2';
*it++ = '1';
EXPECT_EQ(buffer.size(), 2);
EXPECT_EQ(buffer, "42");
}
TEST(IteratorTest, IsOutputIterator) {
EXPECT_TRUE(fmt::internal::is_output_iterator<char*>::value);
EXPECT_FALSE(fmt::internal::is_output_iterator<const char*>::value);
EXPECT_FALSE(fmt::internal::is_output_iterator<std::string>::value);
EXPECT_TRUE(fmt::internal::is_output_iterator<
std::back_insert_iterator<std::string>>::value);
EXPECT_TRUE(fmt::internal::is_output_iterator<std::string::iterator>::value);
EXPECT_FALSE(
fmt::internal::is_output_iterator<std::string::const_iterator>::value);
EXPECT_FALSE(fmt::internal::is_output_iterator<std::list<char>>::value);
EXPECT_TRUE(
fmt::internal::is_output_iterator<std::list<char>::iterator>::value);
EXPECT_FALSE(fmt::internal::is_output_iterator<
std::list<char>::const_iterator>::value);
EXPECT_FALSE(fmt::internal::is_output_iterator<uint32_pair>::value);
}
TEST(MemoryBufferTest, Ctor) {
basic_memory_buffer<char, 123> buffer;
EXPECT_EQ(static_cast<size_t>(0), buffer.size());
EXPECT_EQ(123u, buffer.capacity());
}
static void check_forwarding(mock_allocator<int>& alloc,
allocator_ref<mock_allocator<int>>& ref) {
int mem;
// Check if value_type is properly defined.
allocator_ref<mock_allocator<int>>::value_type* ptr = &mem;
// Check forwarding.
EXPECT_CALL(alloc, allocate(42)).WillOnce(testing::Return(ptr));
ref.allocate(42);
EXPECT_CALL(alloc, deallocate(ptr, 42));
ref.deallocate(ptr, 42);
}
TEST(AllocatorTest, allocator_ref) {
StrictMock<mock_allocator<int>> alloc;
typedef allocator_ref<mock_allocator<int>> test_allocator_ref;
test_allocator_ref ref(&alloc);
// Check if allocator_ref forwards to the underlying allocator.
check_forwarding(alloc, ref);
test_allocator_ref ref2(ref);
check_forwarding(alloc, ref2);
test_allocator_ref ref3;
EXPECT_EQ(nullptr, ref3.get());
ref3 = ref;
check_forwarding(alloc, ref3);
}
typedef allocator_ref<std::allocator<char>> TestAllocator;
static void check_move_buffer(
const char* str, basic_memory_buffer<char, 5, TestAllocator>& buffer) {
std::allocator<char>* alloc = buffer.get_allocator().get();
basic_memory_buffer<char, 5, TestAllocator> buffer2(std::move(buffer));
// Move shouldn't destroy the inline content of the first buffer.
EXPECT_EQ(str, std::string(&buffer[0], buffer.size()));
EXPECT_EQ(str, std::string(&buffer2[0], buffer2.size()));
EXPECT_EQ(5u, buffer2.capacity());
// Move should transfer allocator.
EXPECT_EQ(nullptr, buffer.get_allocator().get());
EXPECT_EQ(alloc, buffer2.get_allocator().get());
}
TEST(MemoryBufferTest, MoveCtor) {
std::allocator<char> alloc;
basic_memory_buffer<char, 5, TestAllocator> buffer((TestAllocator(&alloc)));
const char test[] = "test";
buffer.append(test, test + 4);
check_move_buffer("test", buffer);
// Adding one more character fills the inline buffer, but doesn't cause
// dynamic allocation.
buffer.push_back('a');
check_move_buffer("testa", buffer);
const char* inline_buffer_ptr = &buffer[0];
// Adding one more character causes the content to move from the inline to
// a dynamically allocated buffer.
buffer.push_back('b');
basic_memory_buffer<char, 5, TestAllocator> buffer2(std::move(buffer));
// Move should rip the guts of the first buffer.
EXPECT_EQ(inline_buffer_ptr, &buffer[0]);
EXPECT_EQ("testab", std::string(&buffer2[0], buffer2.size()));
EXPECT_GT(buffer2.capacity(), 5u);
}
static void check_move_assign_buffer(const char* str,
basic_memory_buffer<char, 5>& buffer) {
basic_memory_buffer<char, 5> buffer2;
buffer2 = std::move(buffer);
// Move shouldn't destroy the inline content of the first buffer.
EXPECT_EQ(str, std::string(&buffer[0], buffer.size()));
EXPECT_EQ(str, std::string(&buffer2[0], buffer2.size()));
EXPECT_EQ(5u, buffer2.capacity());
}
TEST(MemoryBufferTest, MoveAssignment) {
basic_memory_buffer<char, 5> buffer;
const char test[] = "test";
buffer.append(test, test + 4);
check_move_assign_buffer("test", buffer);
// Adding one more character fills the inline buffer, but doesn't cause
// dynamic allocation.
buffer.push_back('a');
check_move_assign_buffer("testa", buffer);
const char* inline_buffer_ptr = &buffer[0];
// Adding one more character causes the content to move from the inline to
// a dynamically allocated buffer.
buffer.push_back('b');
basic_memory_buffer<char, 5> buffer2;
buffer2 = std::move(buffer);
// Move should rip the guts of the first buffer.
EXPECT_EQ(inline_buffer_ptr, &buffer[0]);
EXPECT_EQ("testab", std::string(&buffer2[0], buffer2.size()));
EXPECT_GT(buffer2.capacity(), 5u);
}
TEST(MemoryBufferTest, Grow) {
typedef allocator_ref<mock_allocator<int>> Allocator;
typedef basic_memory_buffer<int, 10, Allocator> Base;
mock_allocator<int> alloc;
struct TestMemoryBuffer : Base {
TestMemoryBuffer(Allocator alloc) : Base(alloc) {}
void grow(std::size_t size) { Base::grow(size); }
} buffer((Allocator(&alloc)));
buffer.resize(7);
using fmt::internal::to_unsigned;
for (int i = 0; i < 7; ++i) buffer[to_unsigned(i)] = i * i;
EXPECT_EQ(10u, buffer.capacity());
int mem[20];
mem[7] = 0xdead;
EXPECT_CALL(alloc, allocate(20)).WillOnce(Return(mem));
buffer.grow(20);
EXPECT_EQ(20u, buffer.capacity());
// Check if size elements have been copied
for (int i = 0; i < 7; ++i) EXPECT_EQ(i * i, buffer[to_unsigned(i)]);
// and no more than that.
EXPECT_EQ(0xdead, buffer[7]);
EXPECT_CALL(alloc, deallocate(mem, 20));
}
TEST(MemoryBufferTest, Allocator) {
typedef allocator_ref<mock_allocator<char>> TestAllocator;
basic_memory_buffer<char, 10, TestAllocator> buffer;
EXPECT_EQ(nullptr, buffer.get_allocator().get());
StrictMock<mock_allocator<char>> alloc;
char mem;
{
basic_memory_buffer<char, 10, TestAllocator> buffer2(
(TestAllocator(&alloc)));
EXPECT_EQ(&alloc, buffer2.get_allocator().get());
std::size_t size = 2 * fmt::inline_buffer_size;
EXPECT_CALL(alloc, allocate(size)).WillOnce(Return(&mem));
buffer2.reserve(size);
EXPECT_CALL(alloc, deallocate(&mem, size));
}
}
TEST(MemoryBufferTest, ExceptionInDeallocate) {
typedef allocator_ref<mock_allocator<char>> TestAllocator;
StrictMock<mock_allocator<char>> alloc;
basic_memory_buffer<char, 10, TestAllocator> buffer((TestAllocator(&alloc)));
std::size_t size = 2 * fmt::inline_buffer_size;
std::vector<char> mem(size);
{
EXPECT_CALL(alloc, allocate(size)).WillOnce(Return(&mem[0]));
buffer.resize(size);
std::fill(&buffer[0], &buffer[0] + size, 'x');
}
std::vector<char> mem2(2 * size);
{
EXPECT_CALL(alloc, allocate(2 * size)).WillOnce(Return(&mem2[0]));
std::exception e;
EXPECT_CALL(alloc, deallocate(&mem[0], size)).WillOnce(testing::Throw(e));
EXPECT_THROW(buffer.reserve(2 * size), std::exception);
EXPECT_EQ(&mem2[0], &buffer[0]);
// Check that the data has been copied.
for (std::size_t i = 0; i < size; ++i) EXPECT_EQ('x', buffer[i]);
}
EXPECT_CALL(alloc, deallocate(&mem2[0], 2 * size));
}
#ifdef _WIN32
TEST(UtilTest, UTF16ToUTF8) {
std::string s = "ёжик";
fmt::internal::utf16_to_utf8 u(L"\x0451\x0436\x0438\x043A");
EXPECT_EQ(s, u.str());
EXPECT_EQ(s.size(), u.size());
}
TEST(UtilTest, UTF16ToUTF8EmptyString) {
std::string s = "";
fmt::internal::utf16_to_utf8 u(L"");
EXPECT_EQ(s, u.str());
EXPECT_EQ(s.size(), u.size());
}
TEST(UtilTest, UTF8ToUTF16) {
std::string s = "лошадка";
fmt::internal::utf8_to_utf16 u(s.c_str());
EXPECT_EQ(L"\x043B\x043E\x0448\x0430\x0434\x043A\x0430", u.str());
EXPECT_EQ(7, u.size());
}
TEST(UtilTest, UTF8ToUTF16EmptyString) {
std::string s = "";
fmt::internal::utf8_to_utf16 u(s.c_str());
EXPECT_EQ(L"", u.str());
EXPECT_EQ(s.size(), u.size());
}
template <typename Converter, typename Char>
void check_utf_conversion_error(
const char* message,
fmt::basic_string_view<Char> str = fmt::basic_string_view<Char>(0, 1)) {
fmt::memory_buffer out;
fmt::internal::format_windows_error(out, ERROR_INVALID_PARAMETER, message);
fmt::system_error error(0, "");
try {
(Converter)(str);
} catch (const fmt::system_error& e) {
error = e;
}
EXPECT_EQ(ERROR_INVALID_PARAMETER, error.error_code());
EXPECT_EQ(fmt::to_string(out), error.what());
}
TEST(UtilTest, UTF16ToUTF8Error) {
check_utf_conversion_error<fmt::internal::utf16_to_utf8, wchar_t>(
"cannot convert string from UTF-16 to UTF-8");
}
TEST(UtilTest, UTF8ToUTF16Error) {
const char* message = "cannot convert string from UTF-8 to UTF-16";
check_utf_conversion_error<fmt::internal::utf8_to_utf16, char>(message);
check_utf_conversion_error<fmt::internal::utf8_to_utf16, char>(
message, fmt::string_view("foo", INT_MAX + 1u));
}
TEST(UtilTest, UTF16ToUTF8Convert) {
fmt::internal::utf16_to_utf8 u;
EXPECT_EQ(ERROR_INVALID_PARAMETER, u.convert(fmt::wstring_view(0, 1)));
EXPECT_EQ(ERROR_INVALID_PARAMETER,
u.convert(fmt::wstring_view(L"foo", INT_MAX + 1u)));
}
#endif // _WIN32
typedef void (*FormatErrorMessage)(fmt::internal::buffer<char>& out,
int error_code, string_view message);
template <typename Error>
void check_throw_error(int error_code, FormatErrorMessage format) {
fmt::system_error error(0, "");
try {
throw Error(error_code, "test {}", "error");
} catch (const fmt::system_error& e) {
error = e;
}
fmt::memory_buffer message;
format(message, error_code, "test error");
EXPECT_EQ(to_string(message), error.what());
EXPECT_EQ(error_code, error.error_code());
}
TEST(UtilTest, FormatSystemError) {
fmt::memory_buffer message;
fmt::format_system_error(message, EDOM, "test");
EXPECT_EQ(fmt::format("test: {}", get_system_error(EDOM)),
to_string(message));
message = fmt::memory_buffer();
// Check if std::allocator throws on allocating max size_t / 2 chars.
size_t max_size = max_value<size_t>() / 2;
bool throws_on_alloc = false;
try {
std::allocator<char> alloc;
alloc.deallocate(alloc.allocate(max_size), max_size);
} catch (const std::bad_alloc&) {
throws_on_alloc = true;
}
if (!throws_on_alloc) {
fmt::print("warning: std::allocator allocates {} chars", max_size);
return;
}
fmt::format_system_error(message, EDOM, fmt::string_view(nullptr, max_size));
EXPECT_EQ(fmt::format("error {}", EDOM), to_string(message));
}
TEST(UtilTest, SystemError) {
fmt::system_error e(EDOM, "test");
EXPECT_EQ(fmt::format("test: {}", get_system_error(EDOM)), e.what());
EXPECT_EQ(EDOM, e.error_code());
check_throw_error<fmt::system_error>(EDOM, fmt::format_system_error);
}
TEST(UtilTest, ReportSystemError) {
fmt::memory_buffer out;
fmt::format_system_error(out, EDOM, "test error");
out.push_back('\n');
EXPECT_WRITE(stderr, fmt::report_system_error(EDOM, "test error"),
to_string(out));
}
#ifdef _WIN32
TEST(UtilTest, FormatWindowsError) {
LPWSTR message = 0;
FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
0, ERROR_FILE_EXISTS,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
reinterpret_cast<LPWSTR>(&message), 0, 0);
fmt::internal::utf16_to_utf8 utf8_message(message);
LocalFree(message);
fmt::memory_buffer actual_message;
fmt::internal::format_windows_error(actual_message, ERROR_FILE_EXISTS,
"test");
EXPECT_EQ(fmt::format("test: {}", utf8_message.str()),
fmt::to_string(actual_message));
actual_message.resize(0);
fmt::internal::format_windows_error(
actual_message, ERROR_FILE_EXISTS,
fmt::string_view(0, max_value<size_t>()));
EXPECT_EQ(fmt::format("error {}", ERROR_FILE_EXISTS),
fmt::to_string(actual_message));
}
TEST(UtilTest, FormatLongWindowsError) {
LPWSTR message = 0;
// this error code is not available on all Windows platforms and
// Windows SDKs, so do not fail the test if the error string cannot
// be retrieved.
const int provisioning_not_allowed =
0x80284013L /*TBS_E_PROVISIONING_NOT_ALLOWED*/;
if (FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
0, static_cast<DWORD>(provisioning_not_allowed),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
reinterpret_cast<LPWSTR>(&message), 0, 0) == 0) {
return;
}
fmt::internal::utf16_to_utf8 utf8_message(message);
LocalFree(message);
fmt::memory_buffer actual_message;
fmt::internal::format_windows_error(actual_message, provisioning_not_allowed,
"test");
EXPECT_EQ(fmt::format("test: {}", utf8_message.str()),
fmt::to_string(actual_message));
}
TEST(UtilTest, WindowsError) {
check_throw_error<fmt::windows_error>(ERROR_FILE_EXISTS,
fmt::internal::format_windows_error);
}
TEST(UtilTest, ReportWindowsError) {
fmt::memory_buffer out;
fmt::internal::format_windows_error(out, ERROR_FILE_EXISTS, "test error");
out.push_back('\n');
EXPECT_WRITE(stderr,
fmt::report_windows_error(ERROR_FILE_EXISTS, "test error"),
fmt::to_string(out));
}
#endif // _WIN32
TEST(StringViewTest, Ctor) {
EXPECT_STREQ("abc", string_view("abc").data());
EXPECT_EQ(3u, string_view("abc").size());
EXPECT_STREQ("defg", string_view(std::string("defg")).data());
EXPECT_EQ(4u, string_view(std::string("defg")).size());
}
TEST(WriterTest, Data) {
memory_buffer buf;
fmt::internal::writer w(buf);
w.write(42);
EXPECT_EQ("42", to_string(buf));
}
TEST(WriterTest, WriteInt) {
CHECK_WRITE(42);
CHECK_WRITE(-42);
CHECK_WRITE(static_cast<short>(12));
CHECK_WRITE(34u);
CHECK_WRITE(std::numeric_limits<int>::min());
CHECK_WRITE(max_value<int>());
CHECK_WRITE(max_value<unsigned>());
}
TEST(WriterTest, WriteLong) {
CHECK_WRITE(56l);
CHECK_WRITE(78ul);
CHECK_WRITE(std::numeric_limits<long>::min());
CHECK_WRITE(max_value<long>());
CHECK_WRITE(max_value<unsigned long>());
}
TEST(WriterTest, WriteLongLong) {
CHECK_WRITE(56ll);
CHECK_WRITE(78ull);
CHECK_WRITE(std::numeric_limits<long long>::min());
CHECK_WRITE(max_value<long long>());
CHECK_WRITE(max_value<unsigned long long>());
}
TEST(WriterTest, WriteDouble) {
CHECK_WRITE(4.2);
CHECK_WRITE(-4.2);
auto min = std::numeric_limits<double>::min();
auto max = max_value<double>();
if (fmt::internal::use_grisu<double>()) {
EXPECT_EQ("2.2250738585072014e-308", fmt::format("{}", min));
EXPECT_EQ("1.7976931348623157e+308", fmt::format("{}", max));
} else {
CHECK_WRITE(min);
CHECK_WRITE(max);
}
}
TEST(WriterTest, WriteLongDouble) {
CHECK_WRITE(4.2l);
CHECK_WRITE_CHAR(-4.2l);
std::wstring str;
std_format(4.2l, str);
if (str[0] != '-')
CHECK_WRITE_WCHAR(-4.2l);
else
fmt::print("warning: long double formatting with std::swprintf is broken");
auto min = std::numeric_limits<long double>::min();
auto max = max_value<long double>();
if (fmt::internal::use_grisu<long double>()) {
EXPECT_EQ("2.2250738585072014e-308", fmt::format("{}", min));
EXPECT_EQ("1.7976931348623157e+308", fmt::format("{}", max));
} else {
CHECK_WRITE(min);
CHECK_WRITE(max);
}
}
TEST(WriterTest, WriteDoubleAtBufferBoundary) {
memory_buffer buf;
fmt::internal::writer writer(buf);
for (int i = 0; i < 100; ++i) writer.write(1.23456789);
}
TEST(WriterTest, WriteDoubleWithFilledBuffer) {
memory_buffer buf;
fmt::internal::writer writer(buf);
// Fill the buffer.
for (int i = 0; i < fmt::inline_buffer_size; ++i) writer.write(' ');
writer.write(1.2);
fmt::string_view sv(buf.data(), buf.size());
sv.remove_prefix(fmt::inline_buffer_size);
EXPECT_EQ("1.2", sv);
}
TEST(WriterTest, WriteChar) { CHECK_WRITE('a'); }
TEST(WriterTest, WriteWideChar) { CHECK_WRITE_WCHAR(L'a'); }
TEST(WriterTest, WriteString) {
CHECK_WRITE_CHAR("abc");
CHECK_WRITE_WCHAR("abc");
}
TEST(WriterTest, WriteWideString) {
CHECK_WRITE_WCHAR(L"abc");
}
TEST(FormatToTest, FormatWithoutArgs) {
std::string s;
fmt::format_to(std::back_inserter(s), "test");
EXPECT_EQ("test", s);
}
TEST(FormatToTest, Format) {
std::string s;
fmt::format_to(std::back_inserter(s), "part{0}", 1);
EXPECT_EQ("part1", s);
fmt::format_to(std::back_inserter(s), "part{0}", 2);
EXPECT_EQ("part1part2", s);
}
TEST(FormatToTest, WideString) {
std::vector<wchar_t> buf;
fmt::format_to(std::back_inserter(buf), L"{}{}", 42, L'\0');
EXPECT_STREQ(buf.data(), L"42");
}
TEST(FormatToTest, FormatToMemoryBuffer) {
fmt::basic_memory_buffer<char, 100> buffer;
fmt::format_to(buffer, "{}", "foo");
EXPECT_EQ("foo", to_string(buffer));
fmt::wmemory_buffer wbuffer;
fmt::format_to(wbuffer, L"{}", L"foo");
EXPECT_EQ(L"foo", to_string(wbuffer));
}
TEST(FormatterTest, Escape) {
EXPECT_EQ("{", format("{{"));
EXPECT_EQ("before {", format("before {{"));
EXPECT_EQ("{ after", format("{{ after"));
EXPECT_EQ("before { after", format("before {{ after"));
EXPECT_EQ("}", format("}}"));
EXPECT_EQ("before }", format("before }}"));
EXPECT_EQ("} after", format("}} after"));
EXPECT_EQ("before } after", format("before }} after"));
EXPECT_EQ("{}", format("{{}}"));
EXPECT_EQ("{42}", format("{{{0}}}", 42));
}
TEST(FormatterTest, UnmatchedBraces) {
EXPECT_THROW_MSG(format("{"), format_error, "invalid format string");
EXPECT_THROW_MSG(format("}"), format_error, "unmatched '}' in format string");
EXPECT_THROW_MSG(format("{0{}"), format_error, "invalid format string");
}
TEST(FormatterTest, NoArgs) { EXPECT_EQ("test", format("test")); }
TEST(FormatterTest, ArgsInDifferentPositions) {
EXPECT_EQ("42", format("{0}", 42));
EXPECT_EQ("before 42", format("before {0}", 42));
EXPECT_EQ("42 after", format("{0} after", 42));
EXPECT_EQ("before 42 after", format("before {0} after", 42));
EXPECT_EQ("answer = 42", format("{0} = {1}", "answer", 42));
EXPECT_EQ("42 is the answer", format("{1} is the {0}", "answer", 42));
EXPECT_EQ("abracadabra", format("{0}{1}{0}", "abra", "cad"));
}
TEST(FormatterTest, ArgErrors) {
EXPECT_THROW_MSG(format("{"), format_error, "invalid format string");
EXPECT_THROW_MSG(format("{?}"), format_error, "invalid format string");
EXPECT_THROW_MSG(format("{0"), format_error, "invalid format string");
EXPECT_THROW_MSG(format("{0}"), format_error, "argument index out of range");
EXPECT_THROW_MSG(format("{00}", 42), format_error, "invalid format string");
char format_str[BUFFER_SIZE];
safe_sprintf(format_str, "{%u", INT_MAX);
EXPECT_THROW_MSG(format(format_str), format_error, "invalid format string");
safe_sprintf(format_str, "{%u}", INT_MAX);
EXPECT_THROW_MSG(format(format_str), format_error,
"argument index out of range");
safe_sprintf(format_str, "{%u", INT_MAX + 1u);
EXPECT_THROW_MSG(format(format_str), format_error, "number is too big");
safe_sprintf(format_str, "{%u}", INT_MAX + 1u);
EXPECT_THROW_MSG(format(format_str), format_error, "number is too big");
}
template <int N> struct TestFormat {
template <typename... Args>
static std::string format(fmt::string_view format_str, const Args&... args) {
return TestFormat<N - 1>::format(format_str, N - 1, args...);
}
};
template <> struct TestFormat<0> {
template <typename... Args>
static std::string format(fmt::string_view format_str, const Args&... args) {
return fmt::format(format_str, args...);
}
};
TEST(FormatterTest, ManyArgs) {
EXPECT_EQ("19", TestFormat<20>::format("{19}"));
EXPECT_THROW_MSG(TestFormat<20>::format("{20}"), format_error,
"argument index out of range");
EXPECT_THROW_MSG(TestFormat<21>::format("{21}"), format_error,
"argument index out of range");
enum { max_packed_args = fmt::internal::max_packed_args };
std::string format_str = fmt::format("{{{}}}", max_packed_args + 1);
EXPECT_THROW_MSG(TestFormat<max_packed_args>::format(format_str),
format_error, "argument index out of range");
}
TEST(FormatterTest, NamedArg) {
EXPECT_EQ("1/a/A", format("{_1}/{a_}/{A_}", fmt::arg("a_", 'a'),
fmt::arg("A_", "A"), fmt::arg("_1", 1)));
EXPECT_THROW_MSG(format("{a}"), format_error, "argument not found");
EXPECT_EQ(" -42", format("{0:{width}}", -42, fmt::arg("width", 4)));
EXPECT_EQ("st", format("{0:.{precision}}", "str", fmt::arg("precision", 2)));
EXPECT_EQ("1 2", format("{} {two}", 1, fmt::arg("two", 2)));
EXPECT_EQ("42", format("{c}", fmt::arg("a", 0), fmt::arg("b", 0),
fmt::arg("c", 42), fmt::arg("d", 0), fmt::arg("e", 0),
fmt::arg("f", 0), fmt::arg("g", 0), fmt::arg("h", 0),
fmt::arg("i", 0), fmt::arg("j", 0), fmt::arg("k", 0),
fmt::arg("l", 0), fmt::arg("m", 0), fmt::arg("n", 0),
fmt::arg("o", 0), fmt::arg("p", 0)));
}
TEST(FormatterTest, AutoArgIndex) {
EXPECT_EQ("abc", format("{}{}{}", 'a', 'b', 'c'));
EXPECT_THROW_MSG(format("{0}{}", 'a', 'b'), format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG(format("{}{0}", 'a', 'b'), format_error,
"cannot switch from automatic to manual argument indexing");
EXPECT_EQ("1.2", format("{:.{}}", 1.2345, 2));
EXPECT_THROW_MSG(format("{0}:.{}", 1.2345, 2), format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG(format("{:.{0}}", 1.2345, 2), format_error,
"cannot switch from automatic to manual argument indexing");
EXPECT_THROW_MSG(format("{}"), format_error, "argument index out of range");
}
TEST(FormatterTest, EmptySpecs) { EXPECT_EQ("42", format("{0:}", 42)); }
TEST(FormatterTest, LeftAlign) {
EXPECT_EQ("42 ", format("{0:<4}", 42));
EXPECT_EQ("42 ", format("{0:<4o}", 042));
EXPECT_EQ("42 ", format("{0:<4x}", 0x42));
EXPECT_EQ("-42 ", format("{0:<5}", -42));
EXPECT_EQ("42 ", format("{0:<5}", 42u));
EXPECT_EQ("-42 ", format("{0:<5}", -42l));
EXPECT_EQ("42 ", format("{0:<5}", 42ul));
EXPECT_EQ("-42 ", format("{0:<5}", -42ll));
EXPECT_EQ("42 ", format("{0:<5}", 42ull));
EXPECT_EQ("-42.0 ", format("{0:<7}", -42.0));
EXPECT_EQ("-42.0 ", format("{0:<7}", -42.0l));
EXPECT_EQ("c ", format("{0:<5}", 'c'));
EXPECT_EQ("abc ", format("{0:<5}", "abc"));
EXPECT_EQ("0xface ", format("{0:<8}", reinterpret_cast<void*>(0xface)));
}
TEST(FormatterTest, RightAlign) {
EXPECT_EQ(" 42", format("{0:>4}", 42));
EXPECT_EQ(" 42", format("{0:>4o}", 042));
EXPECT_EQ(" 42", format("{0:>4x}", 0x42));
EXPECT_EQ(" -42", format("{0:>5}", -42));
EXPECT_EQ(" 42", format("{0:>5}", 42u));
EXPECT_EQ(" -42", format("{0:>5}", -42l));
EXPECT_EQ(" 42", format("{0:>5}", 42ul));
EXPECT_EQ(" -42", format("{0:>5}", -42ll));
EXPECT_EQ(" 42", format("{0:>5}", 42ull));
EXPECT_EQ(" -42.0", format("{0:>7}", -42.0));
EXPECT_EQ(" -42.0", format("{0:>7}", -42.0l));
EXPECT_EQ(" c", format("{0:>5}", 'c'));
EXPECT_EQ(" abc", format("{0:>5}", "abc"));
EXPECT_EQ(" 0xface", format("{0:>8}", reinterpret_cast<void*>(0xface)));
}
#if FMT_NUMERIC_ALIGN
TEST(FormatterTest, NumericAlign) {
EXPECT_EQ(" 42", format("{0:=4}", 42));
EXPECT_EQ("+ 42", format("{0:=+4}", 42));
EXPECT_EQ(" 42", format("{0:=4o}", 042));
EXPECT_EQ("+ 42", format("{0:=+4o}", 042));
EXPECT_EQ(" 42", format("{0:=4x}", 0x42));
EXPECT_EQ("+ 42", format("{0:=+4x}", 0x42));
EXPECT_EQ("- 42", format("{0:=5}", -42));
EXPECT_EQ(" 42", format("{0:=5}", 42u));
EXPECT_EQ("- 42", format("{0:=5}", -42l));
EXPECT_EQ(" 42", format("{0:=5}", 42ul));
EXPECT_EQ("- 42", format("{0:=5}", -42ll));
EXPECT_EQ(" 42", format("{0:=5}", 42ull));
EXPECT_EQ("- 42.0", format("{0:=7}", -42.0));
EXPECT_EQ("- 42.0", format("{0:=7}", -42.0l));
EXPECT_THROW_MSG(format("{0:=5", 'c'), format_error,
"missing '}' in format string");
EXPECT_THROW_MSG(format("{0:=5}", 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG(format("{0:=5}", "abc"), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{0:=8}", reinterpret_cast<void*>(0xface)),
format_error, "format specifier requires numeric argument");
EXPECT_EQ(" 1.0", fmt::format("{:= }", 1.0));
}
TEST(FormatToTest, FormatToNonbackInsertIteratorWithSignAndNumericAlignment) {
char buffer[16] = {};
fmt::format_to(fmt::internal::make_checked(buffer, 16), "{: =+}", 42.0);
EXPECT_STREQ("+42.0", buffer);
}
#endif
TEST(FormatterTest, CenterAlign) {
EXPECT_EQ(" 42 ", format("{0:^5}", 42));
EXPECT_EQ(" 42 ", format("{0:^5o}", 042));
EXPECT_EQ(" 42 ", format("{0:^5x}", 0x42));
EXPECT_EQ(" -42 ", format("{0:^5}", -42));
EXPECT_EQ(" 42 ", format("{0:^5}", 42u));
EXPECT_EQ(" -42 ", format("{0:^5}", -42l));
EXPECT_EQ(" 42 ", format("{0:^5}", 42ul));
EXPECT_EQ(" -42 ", format("{0:^5}", -42ll));
EXPECT_EQ(" 42 ", format("{0:^5}", 42ull));
EXPECT_EQ(" -42.0 ", format("{0:^7}", -42.0));
EXPECT_EQ(" -42.0 ", format("{0:^7}", -42.0l));
EXPECT_EQ(" c ", format("{0:^5}", 'c'));
EXPECT_EQ(" abc ", format("{0:^6}", "abc"));
EXPECT_EQ(" 0xface ", format("{0:^8}", reinterpret_cast<void*>(0xface)));
}
TEST(FormatterTest, Fill) {
EXPECT_THROW_MSG(format("{0:{<5}", 'c'), format_error,
"invalid fill character '{'");
EXPECT_THROW_MSG(format("{0:{<5}}", 'c'), format_error,
"invalid fill character '{'");
EXPECT_EQ("**42", format("{0:*>4}", 42));
EXPECT_EQ("**-42", format("{0:*>5}", -42));
EXPECT_EQ("***42", format("{0:*>5}", 42u));
EXPECT_EQ("**-42", format("{0:*>5}", -42l));
EXPECT_EQ("***42", format("{0:*>5}", 42ul));
EXPECT_EQ("**-42", format("{0:*>5}", -42ll));
EXPECT_EQ("***42", format("{0:*>5}", 42ull));
EXPECT_EQ("**-42.0", format("{0:*>7}", -42.0));
EXPECT_EQ("**-42.0", format("{0:*>7}", -42.0l));
EXPECT_EQ("c****", format("{0:*<5}", 'c'));
EXPECT_EQ("abc**", format("{0:*<5}", "abc"));
EXPECT_EQ("**0xface", format("{0:*>8}", reinterpret_cast<void*>(0xface)));
EXPECT_EQ("foo=", format("{:}=", "foo"));
EXPECT_EQ(std::string("\0\0\0*", 4), format(string_view("{:\0>4}", 6), '*'));
}
TEST(FormatterTest, PlusSign) {
EXPECT_EQ("+42", format("{0:+}", 42));
EXPECT_EQ("-42", format("{0:+}", -42));
EXPECT_EQ("+42", format("{0:+}", 42));
EXPECT_THROW_MSG(format("{0:+}", 42u), format_error,
"format specifier requires signed argument");
EXPECT_EQ("+42", format("{0:+}", 42l));
EXPECT_THROW_MSG(format("{0:+}", 42ul), format_error,
"format specifier requires signed argument");
EXPECT_EQ("+42", format("{0:+}", 42ll));
EXPECT_THROW_MSG(format("{0:+}", 42ull), format_error,
"format specifier requires signed argument");
EXPECT_EQ("+42.0", format("{0:+}", 42.0));
EXPECT_EQ("+42.0", format("{0:+}", 42.0l));
EXPECT_THROW_MSG(format("{0:+", 'c'), format_error,
"missing '}' in format string");
EXPECT_THROW_MSG(format("{0:+}", 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG(format("{0:+}", "abc"), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{0:+}", reinterpret_cast<void*>(0x42)), format_error,
"format specifier requires numeric argument");
}
TEST(FormatterTest, MinusSign) {
EXPECT_EQ("42", format("{0:-}", 42));
EXPECT_EQ("-42", format("{0:-}", -42));
EXPECT_EQ("42", format("{0:-}", 42));
EXPECT_THROW_MSG(format("{0:-}", 42u), format_error,
"format specifier requires signed argument");
EXPECT_EQ("42", format("{0:-}", 42l));
EXPECT_THROW_MSG(format("{0:-}", 42ul), format_error,
"format specifier requires signed argument");
EXPECT_EQ("42", format("{0:-}", 42ll));
EXPECT_THROW_MSG(format("{0:-}", 42ull), format_error,
"format specifier requires signed argument");
EXPECT_EQ("42.0", format("{0:-}", 42.0));
EXPECT_EQ("42.0", format("{0:-}", 42.0l));
EXPECT_THROW_MSG(format("{0:-", 'c'), format_error,
"missing '}' in format string");
EXPECT_THROW_MSG(format("{0:-}", 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG(format("{0:-}", "abc"), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{0:-}", reinterpret_cast<void*>(0x42)), format_error,
"format specifier requires numeric argument");
}
TEST(FormatterTest, SpaceSign) {
EXPECT_EQ(" 42", format("{0: }", 42));
EXPECT_EQ("-42", format("{0: }", -42));
EXPECT_EQ(" 42", format("{0: }", 42));
EXPECT_THROW_MSG(format("{0: }", 42u), format_error,
"format specifier requires signed argument");
EXPECT_EQ(" 42", format("{0: }", 42l));
EXPECT_THROW_MSG(format("{0: }", 42ul), format_error,
"format specifier requires signed argument");
EXPECT_EQ(" 42", format("{0: }", 42ll));
EXPECT_THROW_MSG(format("{0: }", 42ull), format_error,
"format specifier requires signed argument");
EXPECT_EQ(" 42.0", format("{0: }", 42.0));
EXPECT_EQ(" 42.0", format("{0: }", 42.0l));
EXPECT_THROW_MSG(format("{0: ", 'c'), format_error,
"missing '}' in format string");
EXPECT_THROW_MSG(format("{0: }", 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG(format("{0: }", "abc"), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{0: }", reinterpret_cast<void*>(0x42)), format_error,
"format specifier requires numeric argument");
}
TEST(FormatterTest, HashFlag) {
EXPECT_EQ("42", format("{0:#}", 42));
EXPECT_EQ("-42", format("{0:#}", -42));
EXPECT_EQ("0b101010", format("{0:#b}", 42));
EXPECT_EQ("0B101010", format("{0:#B}", 42));
EXPECT_EQ("-0b101010", format("{0:#b}", -42));
EXPECT_EQ("0x42", format("{0:#x}", 0x42));
EXPECT_EQ("0X42", format("{0:#X}", 0x42));
EXPECT_EQ("-0x42", format("{0:#x}", -0x42));
EXPECT_EQ("0", format("{0:#o}", 0));
EXPECT_EQ("042", format("{0:#o}", 042));
EXPECT_EQ("-042", format("{0:#o}", -042));
EXPECT_EQ("42", format("{0:#}", 42u));
EXPECT_EQ("0x42", format("{0:#x}", 0x42u));
EXPECT_EQ("042", format("{0:#o}", 042u));
EXPECT_EQ("-42", format("{0:#}", -42l));
EXPECT_EQ("0x42", format("{0:#x}", 0x42l));
EXPECT_EQ("-0x42", format("{0:#x}", -0x42l));
EXPECT_EQ("042", format("{0:#o}", 042l));
EXPECT_EQ("-042", format("{0:#o}", -042l));
EXPECT_EQ("42", format("{0:#}", 42ul));
EXPECT_EQ("0x42", format("{0:#x}", 0x42ul));
EXPECT_EQ("042", format("{0:#o}", 042ul));
EXPECT_EQ("-42", format("{0:#}", -42ll));
EXPECT_EQ("0x42", format("{0:#x}", 0x42ll));
EXPECT_EQ("-0x42", format("{0:#x}", -0x42ll));
EXPECT_EQ("042", format("{0:#o}", 042ll));
EXPECT_EQ("-042", format("{0:#o}", -042ll));
EXPECT_EQ("42", format("{0:#}", 42ull));
EXPECT_EQ("0x42", format("{0:#x}", 0x42ull));
EXPECT_EQ("042", format("{0:#o}", 042ull));
EXPECT_EQ("-42.0", format("{0:#}", -42.0));
EXPECT_EQ("-42.0", format("{0:#}", -42.0l));
EXPECT_THROW_MSG(format("{0:#", 'c'), format_error,
"missing '}' in format string");
EXPECT_THROW_MSG(format("{0:#}", 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG(format("{0:#}", "abc"), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{0:#}", reinterpret_cast<void*>(0x42)), format_error,
"format specifier requires numeric argument");
}
TEST(FormatterTest, ZeroFlag) {
EXPECT_EQ("42", format("{0:0}", 42));
EXPECT_EQ("-0042", format("{0:05}", -42));
EXPECT_EQ("00042", format("{0:05}", 42u));
EXPECT_EQ("-0042", format("{0:05}", -42l));
EXPECT_EQ("00042", format("{0:05}", 42ul));
EXPECT_EQ("-0042", format("{0:05}", -42ll));
EXPECT_EQ("00042", format("{0:05}", 42ull));
EXPECT_EQ("-0042.0", format("{0:07}", -42.0));
EXPECT_EQ("-0042.0", format("{0:07}", -42.0l));
EXPECT_THROW_MSG(format("{0:0", 'c'), format_error,
"missing '}' in format string");
EXPECT_THROW_MSG(format("{0:05}", 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG(format("{0:05}", "abc"), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{0:05}", reinterpret_cast<void*>(0x42)),
format_error, "format specifier requires numeric argument");
}
TEST(FormatterTest, Width) {
char format_str[BUFFER_SIZE];
safe_sprintf(format_str, "{0:%u", UINT_MAX);
increment(format_str + 3);
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
std::size_t size = std::strlen(format_str);
format_str[size] = '}';
format_str[size + 1] = 0;
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
safe_sprintf(format_str, "{0:%u", INT_MAX + 1u);
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
safe_sprintf(format_str, "{0:%u}", INT_MAX + 1u);
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
EXPECT_EQ(" -42", format("{0:4}", -42));
EXPECT_EQ(" 42", format("{0:5}", 42u));
EXPECT_EQ(" -42", format("{0:6}", -42l));
EXPECT_EQ(" 42", format("{0:7}", 42ul));
EXPECT_EQ(" -42", format("{0:6}", -42ll));
EXPECT_EQ(" 42", format("{0:7}", 42ull));
EXPECT_EQ(" -1.23", format("{0:8}", -1.23));
EXPECT_EQ(" -1.23", format("{0:9}", -1.23l));
EXPECT_EQ(" 0xcafe", format("{0:10}", reinterpret_cast<void*>(0xcafe)));
EXPECT_EQ("x ", format("{0:11}", 'x'));
EXPECT_EQ("str ", format("{0:12}", "str"));
}
template <typename T> inline T const_check(T value) { return value; }
TEST(FormatterTest, RuntimeWidth) {
char format_str[BUFFER_SIZE];
safe_sprintf(format_str, "{0:{%u", UINT_MAX);
increment(format_str + 4);
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
std::size_t size = std::strlen(format_str);
format_str[size] = '}';
format_str[size + 1] = 0;
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
format_str[size + 1] = '}';
format_str[size + 2] = 0;
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
EXPECT_THROW_MSG(format("{0:{", 0), format_error, "invalid format string");
EXPECT_THROW_MSG(format("{0:{}", 0), format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG(format("{0:{?}}", 0), format_error, "invalid format string");
EXPECT_THROW_MSG(format("{0:{1}}", 0), format_error,
"argument index out of range");
EXPECT_THROW_MSG(format("{0:{0:}}", 0), format_error,
"invalid format string");
EXPECT_THROW_MSG(format("{0:{1}}", 0, -1), format_error, "negative width");
EXPECT_THROW_MSG(format("{0:{1}}", 0, (INT_MAX + 1u)), format_error,
"number is too big");
EXPECT_THROW_MSG(format("{0:{1}}", 0, -1l), format_error, "negative width");
if (const_check(sizeof(long) > sizeof(int))) {
long value = INT_MAX;
EXPECT_THROW_MSG(format("{0:{1}}", 0, (value + 1)), format_error,
"number is too big");
}
EXPECT_THROW_MSG(format("{0:{1}}", 0, (INT_MAX + 1ul)), format_error,
"number is too big");
EXPECT_THROW_MSG(format("{0:{1}}", 0, '0'), format_error,
"width is not integer");
EXPECT_THROW_MSG(format("{0:{1}}", 0, 0.0), format_error,
"width is not integer");
EXPECT_EQ(" -42", format("{0:{1}}", -42, 4));
EXPECT_EQ(" 42", format("{0:{1}}", 42u, 5));
EXPECT_EQ(" -42", format("{0:{1}}", -42l, 6));
EXPECT_EQ(" 42", format("{0:{1}}", 42ul, 7));
EXPECT_EQ(" -42", format("{0:{1}}", -42ll, 6));
EXPECT_EQ(" 42", format("{0:{1}}", 42ull, 7));
EXPECT_EQ(" -1.23", format("{0:{1}}", -1.23, 8));
EXPECT_EQ(" -1.23", format("{0:{1}}", -1.23l, 9));
EXPECT_EQ(" 0xcafe",
format("{0:{1}}", reinterpret_cast<void*>(0xcafe), 10));
EXPECT_EQ("x ", format("{0:{1}}", 'x', 11));
EXPECT_EQ("str ", format("{0:{1}}", "str", 12));
}
TEST(FormatterTest, Precision) {
char format_str[BUFFER_SIZE];
safe_sprintf(format_str, "{0:.%u", UINT_MAX);
increment(format_str + 4);
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
std::size_t size = std::strlen(format_str);
format_str[size] = '}';
format_str[size + 1] = 0;
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
safe_sprintf(format_str, "{0:.%u", INT_MAX + 1u);
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
safe_sprintf(format_str, "{0:.%u}", INT_MAX + 1u);
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
EXPECT_THROW_MSG(format("{0:.", 0), format_error,
"missing precision specifier");
EXPECT_THROW_MSG(format("{0:.}", 0), format_error,
"missing precision specifier");
EXPECT_THROW_MSG(format("{0:.2", 0), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2}", 42), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2f}", 42), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2}", 42u), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2f}", 42u), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2}", 42l), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2f}", 42l), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2}", 42ul), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2f}", 42ul), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2}", 42ll), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2f}", 42ll), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2}", 42ull), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2f}", 42ull), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2%}", 42), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:3.0}", 'x'), format_error,
"precision not allowed for this argument type");
EXPECT_EQ("1.2", format("{0:.2}", 1.2345));
EXPECT_EQ("1.2", format("{0:.2}", 1.2345l));
EXPECT_THROW_MSG(format("{0:.2}", reinterpret_cast<void*>(0xcafe)),
format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.2f}", reinterpret_cast<void*>(0xcafe)),
format_error,
"precision not allowed for this argument type");
EXPECT_EQ("st", format("{0:.2}", "str"));
}
TEST(FormatterTest, RuntimePrecision) {
char format_str[BUFFER_SIZE];
safe_sprintf(format_str, "{0:.{%u", UINT_MAX);
increment(format_str + 5);
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
std::size_t size = std::strlen(format_str);
format_str[size] = '}';
format_str[size + 1] = 0;
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
format_str[size + 1] = '}';
format_str[size + 2] = 0;
EXPECT_THROW_MSG(format(format_str, 0), format_error, "number is too big");
EXPECT_THROW_MSG(format("{0:.{", 0), format_error, "invalid format string");
EXPECT_THROW_MSG(format("{0:.{}", 0), format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG(format("{0:.{?}}", 0), format_error,
"invalid format string");
EXPECT_THROW_MSG(format("{0:.{1}", 0, 0), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.{1}}", 0), format_error,
"argument index out of range");
EXPECT_THROW_MSG(format("{0:.{0:}}", 0), format_error,
"invalid format string");
EXPECT_THROW_MSG(format("{0:.{1}}", 0, -1), format_error,
"negative precision");
EXPECT_THROW_MSG(format("{0:.{1}}", 0, (INT_MAX + 1u)), format_error,
"number is too big");
EXPECT_THROW_MSG(format("{0:.{1}}", 0, -1l), format_error,
"negative precision");
if (const_check(sizeof(long) > sizeof(int))) {
long value = INT_MAX;
EXPECT_THROW_MSG(format("{0:.{1}}", 0, (value + 1)), format_error,
"number is too big");
}
EXPECT_THROW_MSG(format("{0:.{1}}", 0, (INT_MAX + 1ul)), format_error,
"number is too big");
EXPECT_THROW_MSG(format("{0:.{1}}", 0, '0'), format_error,
"precision is not integer");
EXPECT_THROW_MSG(format("{0:.{1}}", 0, 0.0), format_error,
"precision is not integer");
EXPECT_THROW_MSG(format("{0:.{1}}", 42, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.{1}f}", 42, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.{1}}", 42u, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.{1}f}", 42u, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.{1}}", 42l, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.{1}f}", 42l, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.{1}}", 42ul, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.{1}f}", 42ul, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.{1}}", 42ll, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.{1}f}", 42ll, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.{1}}", 42ull, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.{1}f}", 42ull, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:3.{1}}", 'x', 0), format_error,
"precision not allowed for this argument type");
EXPECT_EQ("1.2", format("{0:.{1}}", 1.2345, 2));
EXPECT_EQ("1.2", format("{1:.{0}}", 2, 1.2345l));
EXPECT_THROW_MSG(format("{0:.{1}}", reinterpret_cast<void*>(0xcafe), 2),
format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(format("{0:.{1}f}", reinterpret_cast<void*>(0xcafe), 2),
format_error,
"precision not allowed for this argument type");
EXPECT_EQ("st", format("{0:.{1}}", "str", 2));
}
template <typename T>
void check_unknown_types(const T& value, const char* types, const char*) {
char format_str[BUFFER_SIZE];
const char* special = ".0123456789}";
for (int i = CHAR_MIN; i <= CHAR_MAX; ++i) {
char c = static_cast<char>(i);
if (std::strchr(types, c) || std::strchr(special, c) || !c) continue;
safe_sprintf(format_str, "{0:10%c}", c);
const char* message = "invalid type specifier";
EXPECT_THROW_MSG(format(format_str, value), format_error, message)
<< format_str << " " << message;
}
}
TEST(BoolTest, FormatBool) {
EXPECT_EQ("true", format("{}", true));
EXPECT_EQ("false", format("{}", false));
EXPECT_EQ("1", format("{:d}", true));
EXPECT_EQ("true ", format("{:5}", true));
EXPECT_EQ(L"true", format(L"{}", true));
}
TEST(FormatterTest, FormatShort) {
short s = 42;
EXPECT_EQ("42", format("{0:d}", s));
unsigned short us = 42;
EXPECT_EQ("42", format("{0:d}", us));
}
TEST(FormatterTest, FormatInt) {
EXPECT_THROW_MSG(format("{0:v", 42), format_error,
"missing '}' in format string");
check_unknown_types(42, "bBdoxXn", "integer");
}
TEST(FormatterTest, FormatBin) {
EXPECT_EQ("0", format("{0:b}", 0));
EXPECT_EQ("101010", format("{0:b}", 42));
EXPECT_EQ("101010", format("{0:b}", 42u));
EXPECT_EQ("-101010", format("{0:b}", -42));
EXPECT_EQ("11000000111001", format("{0:b}", 12345));
EXPECT_EQ("10010001101000101011001111000", format("{0:b}", 0x12345678));
EXPECT_EQ("10010000101010111100110111101111", format("{0:b}", 0x90ABCDEF));
EXPECT_EQ("11111111111111111111111111111111",
format("{0:b}", max_value<uint32_t>()));
}
#if FMT_USE_INT128
constexpr auto int128_max = static_cast<__int128_t>(
(static_cast<__uint128_t>(1) << ((__SIZEOF_INT128__ * CHAR_BIT) - 1)) - 1);
constexpr auto int128_min = -int128_max - 1;
constexpr auto uint128_max = ~static_cast<__uint128_t>(0);
#endif
TEST(FormatterTest, FormatDec) {
EXPECT_EQ("0", format("{0}", 0));
EXPECT_EQ("42", format("{0}", 42));
EXPECT_EQ("42", format("{0:d}", 42));
EXPECT_EQ("42", format("{0}", 42u));
EXPECT_EQ("-42", format("{0}", -42));
EXPECT_EQ("12345", format("{0}", 12345));
EXPECT_EQ("67890", format("{0}", 67890));
#if FMT_USE_INT128
EXPECT_EQ("0", format("{0}", static_cast<__int128_t>(0)));
EXPECT_EQ("0", format("{0}", static_cast<__uint128_t>(0)));
EXPECT_EQ("9223372036854775808",
format("{0}", static_cast<__int128_t>(INT64_MAX) + 1));
EXPECT_EQ("-9223372036854775809",
format("{0}", static_cast<__int128_t>(INT64_MIN) - 1));
EXPECT_EQ("18446744073709551616",
format("{0}", static_cast<__int128_t>(UINT64_MAX) + 1));
EXPECT_EQ("170141183460469231731687303715884105727",
format("{0}", int128_max));
EXPECT_EQ("-170141183460469231731687303715884105728",
format("{0}", int128_min));
EXPECT_EQ("340282366920938463463374607431768211455",
format("{0}", uint128_max));
#endif
char buffer[BUFFER_SIZE];
safe_sprintf(buffer, "%d", INT_MIN);
EXPECT_EQ(buffer, format("{0}", INT_MIN));
safe_sprintf(buffer, "%d", INT_MAX);
EXPECT_EQ(buffer, format("{0}", INT_MAX));
safe_sprintf(buffer, "%u", UINT_MAX);
EXPECT_EQ(buffer, format("{0}", UINT_MAX));
safe_sprintf(buffer, "%ld", 0 - static_cast<unsigned long>(LONG_MIN));
EXPECT_EQ(buffer, format("{0}", LONG_MIN));
safe_sprintf(buffer, "%ld", LONG_MAX);
EXPECT_EQ(buffer, format("{0}", LONG_MAX));
safe_sprintf(buffer, "%lu", ULONG_MAX);
EXPECT_EQ(buffer, format("{0}", ULONG_MAX));
}
TEST(FormatterTest, FormatHex) {
EXPECT_EQ("0", format("{0:x}", 0));
EXPECT_EQ("42", format("{0:x}", 0x42));
EXPECT_EQ("42", format("{0:x}", 0x42u));
EXPECT_EQ("-42", format("{0:x}", -0x42));
EXPECT_EQ("12345678", format("{0:x}", 0x12345678));
EXPECT_EQ("90abcdef", format("{0:x}", 0x90abcdef));
EXPECT_EQ("12345678", format("{0:X}", 0x12345678));
EXPECT_EQ("90ABCDEF", format("{0:X}", 0x90ABCDEF));
#if FMT_USE_INT128
EXPECT_EQ("0", format("{0:x}", static_cast<__int128_t>(0)));
EXPECT_EQ("0", format("{0:x}", static_cast<__uint128_t>(0)));
EXPECT_EQ("8000000000000000",
format("{0:x}", static_cast<__int128_t>(INT64_MAX) + 1));
EXPECT_EQ("-8000000000000001",
format("{0:x}", static_cast<__int128_t>(INT64_MIN) - 1));
EXPECT_EQ("10000000000000000",
format("{0:x}", static_cast<__int128_t>(UINT64_MAX) + 1));
EXPECT_EQ("7fffffffffffffffffffffffffffffff", format("{0:x}", int128_max));
EXPECT_EQ("-80000000000000000000000000000000", format("{0:x}", int128_min));
EXPECT_EQ("ffffffffffffffffffffffffffffffff", format("{0:x}", uint128_max));
#endif
char buffer[BUFFER_SIZE];
safe_sprintf(buffer, "-%x", 0 - static_cast<unsigned>(INT_MIN));
EXPECT_EQ(buffer, format("{0:x}", INT_MIN));
safe_sprintf(buffer, "%x", INT_MAX);
EXPECT_EQ(buffer, format("{0:x}", INT_MAX));
safe_sprintf(buffer, "%x", UINT_MAX);
EXPECT_EQ(buffer, format("{0:x}", UINT_MAX));
safe_sprintf(buffer, "-%lx", 0 - static_cast<unsigned long>(LONG_MIN));
EXPECT_EQ(buffer, format("{0:x}", LONG_MIN));
safe_sprintf(buffer, "%lx", LONG_MAX);
EXPECT_EQ(buffer, format("{0:x}", LONG_MAX));
safe_sprintf(buffer, "%lx", ULONG_MAX);
EXPECT_EQ(buffer, format("{0:x}", ULONG_MAX));
}
TEST(FormatterTest, FormatOct) {
EXPECT_EQ("0", format("{0:o}", 0));
EXPECT_EQ("42", format("{0:o}", 042));
EXPECT_EQ("42", format("{0:o}", 042u));
EXPECT_EQ("-42", format("{0:o}", -042));
EXPECT_EQ("12345670", format("{0:o}", 012345670));
#if FMT_USE_INT128
EXPECT_EQ("0", format("{0:o}", static_cast<__int128_t>(0)));
EXPECT_EQ("0", format("{0:o}", static_cast<__uint128_t>(0)));
EXPECT_EQ("1000000000000000000000",
format("{0:o}", static_cast<__int128_t>(INT64_MAX) + 1));
EXPECT_EQ("-1000000000000000000001",
format("{0:o}", static_cast<__int128_t>(INT64_MIN) - 1));
EXPECT_EQ("2000000000000000000000",
format("{0:o}", static_cast<__int128_t>(UINT64_MAX) + 1));
EXPECT_EQ("1777777777777777777777777777777777777777777",
format("{0:o}", int128_max));
EXPECT_EQ("-2000000000000000000000000000000000000000000",
format("{0:o}", int128_min));
EXPECT_EQ("3777777777777777777777777777777777777777777",
format("{0:o}", uint128_max));
#endif
char buffer[BUFFER_SIZE];
safe_sprintf(buffer, "-%o", 0 - static_cast<unsigned>(INT_MIN));
EXPECT_EQ(buffer, format("{0:o}", INT_MIN));
safe_sprintf(buffer, "%o", INT_MAX);
EXPECT_EQ(buffer, format("{0:o}", INT_MAX));
safe_sprintf(buffer, "%o", UINT_MAX);
EXPECT_EQ(buffer, format("{0:o}", UINT_MAX));
safe_sprintf(buffer, "-%lo", 0 - static_cast<unsigned long>(LONG_MIN));
EXPECT_EQ(buffer, format("{0:o}", LONG_MIN));
safe_sprintf(buffer, "%lo", LONG_MAX);
EXPECT_EQ(buffer, format("{0:o}", LONG_MAX));
safe_sprintf(buffer, "%lo", ULONG_MAX);
EXPECT_EQ(buffer, format("{0:o}", ULONG_MAX));
}
TEST(FormatterTest, FormatIntLocale) {
EXPECT_EQ("123", format("{:n}", 123));
EXPECT_EQ("1,234", format("{:n}", 1234));
EXPECT_EQ("1,234,567", format("{:n}", 1234567));
EXPECT_EQ("4,294,967,295",
format("{:n}", max_value<uint32_t>()));
}
struct ConvertibleToLongLong {
operator long long() const { return 1LL << 32; }
};
TEST(FormatterTest, FormatConvertibleToLongLong) {
EXPECT_EQ("100000000", format("{:x}", ConvertibleToLongLong()));
}
TEST(FormatterTest, FormatFloat) {
EXPECT_EQ("392.500000", format("{0:f}", 392.5f));
EXPECT_EQ("12.500000%", format("{0:%}", 0.125f));
}
TEST(FormatterTest, FormatDouble) {
check_unknown_types(1.2, "eEfFgGaAn%", "double");
EXPECT_EQ("0.0", format("{:}", 0.0));
EXPECT_EQ("0.000000", format("{:f}", 0.0));
EXPECT_EQ("0", format("{:g}", 0.0));
EXPECT_EQ("392.65", format("{:}", 392.65));
EXPECT_EQ("392.65", format("{:g}", 392.65));
EXPECT_EQ("392.65", format("{:G}", 392.65));
EXPECT_EQ("392.650000", format("{:f}", 392.65));
EXPECT_EQ("392.650000", format("{:F}", 392.65));
EXPECT_EQ("12.500000%", format("{:%}", 0.125));
EXPECT_EQ("12.34%", format("{:.2%}", 0.1234432));
char buffer[BUFFER_SIZE];
safe_sprintf(buffer, "%e", 392.65);
EXPECT_EQ(buffer, format("{0:e}", 392.65));
safe_sprintf(buffer, "%E", 392.65);
EXPECT_EQ(buffer, format("{0:E}", 392.65));
EXPECT_EQ("+0000392.6", format("{0:+010.4g}", 392.65));
safe_sprintf(buffer, "%a", -42.0);
EXPECT_EQ(buffer, format("{:a}", -42.0));
safe_sprintf(buffer, "%A", -42.0);
EXPECT_EQ(buffer, format("{:A}", -42.0));
}
TEST(FormatterTest, PrecisionRounding) {
EXPECT_EQ("0", format("{:.0f}", 0.0));
EXPECT_EQ("0", format("{:.0f}", 0.01));
EXPECT_EQ("0", format("{:.0f}", 0.1));
EXPECT_EQ("0.000", format("{:.3f}", 0.00049));
EXPECT_EQ("0.001", format("{:.3f}", 0.0005));
EXPECT_EQ("0.001", format("{:.3f}", 0.00149));
EXPECT_EQ("0.002", format("{:.3f}", 0.0015));
EXPECT_EQ("1.000", format("{:.3f}", 0.9999));
EXPECT_EQ("0.00123", format("{:.3}", 0.00123));
EXPECT_EQ("0.1", format("{:.16g}", 0.1));
// Trigger rounding error in Grisu by a carefully chosen number.
auto n = 3788512123356.985352;
char buffer[64];
safe_sprintf(buffer, "%f", n);
EXPECT_EQ(buffer, format("{:f}", n));
}
TEST(FormatterTest, FormatNaN) {
double nan = std::numeric_limits<double>::quiet_NaN();
EXPECT_EQ("nan", format("{}", nan));
EXPECT_EQ("+nan", format("{:+}", nan));
EXPECT_EQ(" nan", format("{: }", nan));
EXPECT_EQ("NAN", format("{:F}", nan));
EXPECT_EQ("nan ", format("{:<7}", nan));
EXPECT_EQ(" nan ", format("{:^7}", nan));
EXPECT_EQ(" nan", format("{:>7}", nan));
EXPECT_EQ("nan%", format("{:%}", nan));
}
TEST(FormatterTest, FormatInfinity) {
double inf = std::numeric_limits<double>::infinity();
EXPECT_EQ("inf", format("{}", inf));
EXPECT_EQ("+inf", format("{:+}", inf));
EXPECT_EQ("-inf", format("{}", -inf));
EXPECT_EQ(" inf", format("{: }", inf));
EXPECT_EQ("INF", format("{:F}", inf));
EXPECT_EQ("inf ", format("{:<7}", inf));
EXPECT_EQ(" inf ", format("{:^7}", inf));
EXPECT_EQ(" inf", format("{:>7}", inf));
EXPECT_EQ("inf%", format("{:%}", inf));
}
TEST(FormatterTest, FormatLongDouble) {
EXPECT_EQ("0.0", format("{0:}", 0.0l));
EXPECT_EQ("0.000000", format("{0:f}", 0.0l));
EXPECT_EQ("392.65", format("{0:}", 392.65l));
EXPECT_EQ("392.65", format("{0:g}", 392.65l));
EXPECT_EQ("392.65", format("{0:G}", 392.65l));
EXPECT_EQ("392.650000", format("{0:f}", 392.65l));
EXPECT_EQ("392.650000", format("{0:F}", 392.65l));
EXPECT_EQ("12.500000%", format("{:%}", 0.125l));
EXPECT_EQ("12.34%", format("{:.2%}", 0.1234432l));
char buffer[BUFFER_SIZE];
safe_sprintf(buffer, "%Le", 392.65l);
EXPECT_EQ(buffer, format("{0:e}", 392.65l));
EXPECT_EQ("+0000392.6", format("{0:+010.4g}", 392.64l));
safe_sprintf(buffer, "%La", 3.31l);
EXPECT_EQ(buffer, format("{:a}", 3.31l));
}
TEST(FormatterTest, FormatChar) {
const char types[] = "cbBdoxXn";
check_unknown_types('a', types, "char");
EXPECT_EQ("a", format("{0}", 'a'));
EXPECT_EQ("z", format("{0:c}", 'z'));
EXPECT_EQ(L"a", format(L"{0}", 'a'));
int n = 'x';
for (const char* type = types + 1; *type; ++type) {
std::string format_str = fmt::format("{{:{}}}", *type);
EXPECT_EQ(fmt::format(format_str, n), fmt::format(format_str, 'x'));
}
EXPECT_EQ(fmt::format("{:02X}", n), fmt::format("{:02X}", 'x'));
}
TEST(FormatterTest, FormatVolatileChar) {
volatile char c = 'x';
EXPECT_EQ("x", format("{}", c));
}
TEST(FormatterTest, FormatUnsignedChar) {
EXPECT_EQ("42", format("{}", static_cast<unsigned char>(42)));
EXPECT_EQ("42", format("{}", static_cast<uint8_t>(42)));
}
TEST(FormatterTest, FormatWChar) {
EXPECT_EQ(L"a", format(L"{0}", L'a'));
// This shouldn't compile:
// format("{}", L'a');
}
TEST(FormatterTest, FormatCString) {
check_unknown_types("test", "sp", "string");
EXPECT_EQ("test", format("{0}", "test"));
EXPECT_EQ("test", format("{0:s}", "test"));
char nonconst[] = "nonconst";
EXPECT_EQ("nonconst", format("{0}", nonconst));
EXPECT_THROW_MSG(format("{0}", static_cast<const char*>(nullptr)),
format_error, "string pointer is null");
}
TEST(FormatterTest, FormatSCharString) {
signed char str[] = "test";
EXPECT_EQ("test", format("{0:s}", str));
const signed char* const_str = str;
EXPECT_EQ("test", format("{0:s}", const_str));
}
TEST(FormatterTest, FormatUCharString) {
unsigned char str[] = "test";
EXPECT_EQ("test", format("{0:s}", str));
const unsigned char* const_str = str;
EXPECT_EQ("test", format("{0:s}", const_str));
unsigned char* ptr = str;
EXPECT_EQ("test", format("{0:s}", ptr));
}
TEST(FormatterTest, FormatPointer) {
check_unknown_types(reinterpret_cast<void*>(0x1234), "p", "pointer");
EXPECT_EQ("0x0", format("{0}", static_cast<void*>(nullptr)));
EXPECT_EQ("0x1234", format("{0}", reinterpret_cast<void*>(0x1234)));
EXPECT_EQ("0x1234", format("{0:p}", reinterpret_cast<void*>(0x1234)));
EXPECT_EQ("0x" + std::string(sizeof(void*) * CHAR_BIT / 4, 'f'),
format("{0}", reinterpret_cast<void*>(~uintptr_t())));
EXPECT_EQ("0x1234", format("{}", fmt::ptr(reinterpret_cast<int*>(0x1234))));
std::unique_ptr<int> up(new int(1));
EXPECT_EQ(format("{}", fmt::ptr(up.get())), format("{}", fmt::ptr(up)));
std::shared_ptr<int> sp(new int(1));
EXPECT_EQ(format("{}", fmt::ptr(sp.get())), format("{}", fmt::ptr(sp)));
EXPECT_EQ("0x0", format("{}", nullptr));
}
TEST(FormatterTest, FormatString) {
EXPECT_EQ("test", format("{0}", std::string("test")));
}
TEST(FormatterTest, FormatStringView) {
EXPECT_EQ("test", format("{}", string_view("test")));
EXPECT_EQ("", format("{}", string_view()));
}
#ifdef FMT_USE_STRING_VIEW
struct string_viewable {};
FMT_BEGIN_NAMESPACE
template <> struct formatter<string_viewable> : formatter<std::string_view> {
auto format(string_viewable, format_context& ctx) -> decltype(ctx.out()) {
return formatter<std::string_view>::format("foo", ctx);
}
};
FMT_END_NAMESPACE
TEST(FormatterTest, FormatStdStringView) {
EXPECT_EQ("test", format("{}", std::string_view("test")));
EXPECT_EQ("foo", format("{}", string_viewable()));
}
#endif
FMT_BEGIN_NAMESPACE
template <> struct formatter<Date> {
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
auto it = ctx.begin();
if (*it == 'd') ++it;
return it;
}
auto format(const Date& d, format_context& ctx) -> decltype(ctx.out()) {
format_to(ctx.out(), "{}-{}-{}", d.year(), d.month(), d.day());
return ctx.out();
}
};
FMT_END_NAMESPACE
TEST(FormatterTest, FormatCustom) {
Date date(2012, 12, 9);
EXPECT_THROW_MSG(fmt::format("{:s}", date), format_error,
"unknown format specifier");
}
class Answer {};
FMT_BEGIN_NAMESPACE
template <> struct formatter<Answer> : formatter<int> {
template <typename FormatContext>
auto format(Answer, FormatContext& ctx) -> decltype(ctx.out()) {
return formatter<int>::format(42, ctx);
}
};
FMT_END_NAMESPACE
TEST(FormatterTest, CustomFormat) {
EXPECT_EQ("42", format("{0}", Answer()));
EXPECT_EQ("0042", format("{:04}", Answer()));
}
TEST(FormatterTest, CustomFormatTo) {
char buf[10] = {};
auto end =
&*fmt::format_to(fmt::internal::make_checked(buf, 10), "{}", Answer());
EXPECT_EQ(end, buf + 2);
EXPECT_STREQ(buf, "42");
}
TEST(FormatterTest, WideFormatString) {
EXPECT_EQ(L"42", format(L"{}", 42));
EXPECT_EQ(L"4.2", format(L"{}", 4.2));
EXPECT_EQ(L"abc", format(L"{}", L"abc"));
EXPECT_EQ(L"z", format(L"{}", L'z'));
}
TEST(FormatterTest, FormatStringFromSpeedTest) {
EXPECT_EQ("1.2340000000:0042:+3.13:str:0x3e8:X:%",
format("{0:0.10f}:{1:04}:{2:+g}:{3}:{4}:{5}:%", 1.234, 42, 3.13,
"str", reinterpret_cast<void*>(1000), 'X'));
}
TEST(FormatterTest, FormatExamples) {
std::string message = format("The answer is {}", 42);
EXPECT_EQ("The answer is 42", message);
EXPECT_EQ("42", format("{}", 42));
EXPECT_EQ("42", format(std::string("{}"), 42));
memory_buffer out;
format_to(out, "The answer is {}.", 42);
EXPECT_EQ("The answer is 42.", to_string(out));
const char* filename = "nonexistent";
FILE* ftest = safe_fopen(filename, "r");
if (ftest) fclose(ftest);
int error_code = errno;
EXPECT_TRUE(ftest == nullptr);
EXPECT_SYSTEM_ERROR(
{
FILE* f = safe_fopen(filename, "r");
if (!f)
throw fmt::system_error(errno, "Cannot open file '{}'", filename);
fclose(f);
},
error_code, "Cannot open file 'nonexistent'");
}
TEST(FormatterTest, Examples) {
EXPECT_EQ("First, thou shalt count to three",
format("First, thou shalt count to {0}", "three"));
EXPECT_EQ("Bring me a shrubbery", format("Bring me a {}", "shrubbery"));
EXPECT_EQ("From 1 to 3", format("From {} to {}", 1, 3));
char buffer[BUFFER_SIZE];
safe_sprintf(buffer, "%03.2f", -1.2);
EXPECT_EQ(buffer, format("{:03.2f}", -1.2));
EXPECT_EQ("a, b, c", format("{0}, {1}, {2}", 'a', 'b', 'c'));
EXPECT_EQ("a, b, c", format("{}, {}, {}", 'a', 'b', 'c'));
EXPECT_EQ("c, b, a", format("{2}, {1}, {0}", 'a', 'b', 'c'));
EXPECT_EQ("abracadabra", format("{0}{1}{0}", "abra", "cad"));
EXPECT_EQ("left aligned ", format("{:<30}", "left aligned"));
EXPECT_EQ(" right aligned",
format("{:>30}", "right aligned"));
EXPECT_EQ(" centered ", format("{:^30}", "centered"));
EXPECT_EQ("***********centered***********", format("{:*^30}", "centered"));
EXPECT_EQ("+3.140000; -3.140000", format("{:+f}; {:+f}", 3.14, -3.14));
EXPECT_EQ(" 3.140000; -3.140000", format("{: f}; {: f}", 3.14, -3.14));
EXPECT_EQ("3.140000; -3.140000", format("{:-f}; {:-f}", 3.14, -3.14));
EXPECT_EQ("int: 42; hex: 2a; oct: 52",
format("int: {0:d}; hex: {0:x}; oct: {0:o}", 42));
EXPECT_EQ("int: 42; hex: 0x2a; oct: 052",
format("int: {0:d}; hex: {0:#x}; oct: {0:#o}", 42));
EXPECT_EQ("The answer is 42", format("The answer is {}", 42));
EXPECT_THROW_MSG(format("The answer is {:d}", "forty-two"), format_error,
"invalid type specifier");
EXPECT_EQ(L"Cyrillic letter \x42e", format(L"Cyrillic letter {}", L'\x42e'));
EXPECT_WRITE(
stdout, fmt::print("{}", std::numeric_limits<double>::infinity()), "inf");
}
TEST(FormatIntTest, Data) {
fmt::format_int format_int(42);
EXPECT_EQ("42", std::string(format_int.data(), format_int.size()));
}
TEST(FormatIntTest, FormatInt) {
EXPECT_EQ("42", fmt::format_int(42).str());
EXPECT_EQ(2u, fmt::format_int(42).size());
EXPECT_EQ("-42", fmt::format_int(-42).str());
EXPECT_EQ(3u, fmt::format_int(-42).size());
EXPECT_EQ("42", fmt::format_int(42ul).str());
EXPECT_EQ("-42", fmt::format_int(-42l).str());
EXPECT_EQ("42", fmt::format_int(42ull).str());
EXPECT_EQ("-42", fmt::format_int(-42ll).str());
std::ostringstream os;
os << max_value<int64_t>();
EXPECT_EQ(os.str(),
fmt::format_int(max_value<int64_t>()).str());
}
TEST(FormatTest, Print) {
#if FMT_USE_FILE_DESCRIPTORS
EXPECT_WRITE(stdout, fmt::print("Don't {}!", "panic"), "Don't panic!");
EXPECT_WRITE(stderr, fmt::print(stderr, "Don't {}!", "panic"),
"Don't panic!");
#endif
}
TEST(FormatTest, Variadic) {
EXPECT_EQ("abc1", format("{}c{}", "ab", 1));
EXPECT_EQ(L"abc1", format(L"{}c{}", L"ab", 1));
}
TEST(FormatTest, Dynamic) {
typedef fmt::format_context ctx;
std::vector<fmt::basic_format_arg<ctx>> args;
args.emplace_back(fmt::internal::make_arg<ctx>(42));
args.emplace_back(fmt::internal::make_arg<ctx>("abc1"));
args.emplace_back(fmt::internal::make_arg<ctx>(1.5f));
std::string result = fmt::vformat(
"{} and {} and {}", fmt::basic_format_args<ctx>(
args.data(), static_cast<unsigned>(args.size())));
EXPECT_EQ("42 and abc1 and 1.5", result);
}
TEST(FormatTest, JoinArg) {
using fmt::join;
int v1[3] = {1, 2, 3};
std::vector<float> v2;
v2.push_back(1.2f);
v2.push_back(3.4f);
void* v3[2] = {&v1[0], &v1[1]};
EXPECT_EQ("(1, 2, 3)", format("({})", join(v1, v1 + 3, ", ")));
EXPECT_EQ("(1)", format("({})", join(v1, v1 + 1, ", ")));
EXPECT_EQ("()", format("({})", join(v1, v1, ", ")));
EXPECT_EQ("(001, 002, 003)", format("({:03})", join(v1, v1 + 3, ", ")));
EXPECT_EQ("(+01.20, +03.40)",
format("({:+06.2f})", join(v2.begin(), v2.end(), ", ")));
EXPECT_EQ(L"(1, 2, 3)", format(L"({})", join(v1, v1 + 3, L", ")));
EXPECT_EQ("1, 2, 3", format("{0:{1}}", join(v1, v1 + 3, ", "), 1));
EXPECT_EQ(format("{}, {}", v3[0], v3[1]),
format("{}", join(v3, v3 + 2, ", ")));
#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 405
EXPECT_EQ("(1, 2, 3)", format("({})", join(v1, ", ")));
EXPECT_EQ("(+01.20, +03.40)", format("({:+06.2f})", join(v2, ", ")));
#endif
}
template <typename T> std::string str(const T& value) {
return fmt::format("{}", value);
}
TEST(StrTest, Convert) {
EXPECT_EQ("42", str(42));
std::string s = str(Date(2012, 12, 9));
EXPECT_EQ("2012-12-9", s);
}
std::string vformat_message(int id, const char* format, fmt::format_args args) {
fmt::memory_buffer buffer;
format_to(buffer, "[{}] ", id);
vformat_to(buffer, format, args);
return to_string(buffer);
}
template <typename... Args>
std::string format_message(int id, const char* format, const Args&... args) {
auto va = fmt::make_format_args(args...);
return vformat_message(id, format, va);
}
TEST(FormatTest, FormatMessageExample) {
EXPECT_EQ("[42] something happened",
format_message(42, "{} happened", "something"));
}
template <typename... Args>
void print_error(const char* file, int line, const char* format,
const Args&... args) {
fmt::print("{}: {}: ", file, line);
fmt::print(format, args...);
}
TEST(FormatTest, UnpackedArgs) {
EXPECT_EQ("0123456789abcdefg",
fmt::format("{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}", 0, 1, 2, 3, 4, 5,
6, 7, 8, 9, 'a', 'b', 'c', 'd', 'e', 'f', 'g'));
}
struct string_like {};
fmt::string_view to_string_view(string_like) { return "foo"; }
TEST(FormatTest, CompileTimeString) {
EXPECT_EQ("42", fmt::format(FMT_STRING("{}"), 42));
EXPECT_EQ(L"42", fmt::format(FMT_STRING(L"{}"), 42));
EXPECT_EQ("foo", fmt::format(FMT_STRING("{}"), string_like()));
}
TEST(FormatTest, CustomFormatCompileTimeString) {
EXPECT_EQ("42", fmt::format(FMT_STRING("{}"), Answer()));
Answer answer;
EXPECT_EQ("42", fmt::format(FMT_STRING("{}"), answer));
const Answer const_answer;
EXPECT_EQ("42", fmt::format(FMT_STRING("{}"), const_answer));
}
#if FMT_USE_USER_DEFINED_LITERALS
// Passing user-defined literals directly to EXPECT_EQ causes problems
// with macro argument stringification (#) on some versions of GCC.
// Workaround: Assing the UDL result to a variable before the macro.
using namespace fmt::literals;
TEST(LiteralsTest, Format) {
auto udl_format = "{}c{}"_format("ab", 1);
EXPECT_EQ(format("{}c{}", "ab", 1), udl_format);
auto udl_format_w = L"{}c{}"_format(L"ab", 1);
EXPECT_EQ(format(L"{}c{}", L"ab", 1), udl_format_w);
}
TEST(LiteralsTest, NamedArg) {
auto udl_a = format("{first}{second}{first}{third}", "first"_a = "abra",
"second"_a = "cad", "third"_a = 99);
EXPECT_EQ(format("{first}{second}{first}{third}", fmt::arg("first", "abra"),
fmt::arg("second", "cad"), fmt::arg("third", 99)),
udl_a);
auto udl_a_w = format(L"{first}{second}{first}{third}", L"first"_a = L"abra",
L"second"_a = L"cad", L"third"_a = 99);
EXPECT_EQ(
format(L"{first}{second}{first}{third}", fmt::arg(L"first", L"abra"),
fmt::arg(L"second", L"cad"), fmt::arg(L"third", 99)),
udl_a_w);
}
TEST(FormatTest, UdlTemplate) {
EXPECT_EQ("foo", "foo"_format());
EXPECT_EQ(" 42", "{0:10}"_format(42));
}
TEST(FormatTest, UdlPassUserDefinedObjectAsLvalue) {
Date date(2015, 10, 21);
EXPECT_EQ("2015-10-21", "{}"_format(date));
}
#endif // FMT_USE_USER_DEFINED_LITERALS
enum TestEnum { A };
TEST(FormatTest, Enum) { EXPECT_EQ("0", fmt::format("{}", A)); }
TEST(FormatTest, FormatterNotSpecialized) {
EXPECT_FALSE((fmt::internal::has_formatter<fmt::formatter<TestEnum>,
fmt::format_context>::value));
}
#if FMT_HAS_FEATURE(cxx_strong_enums)
enum big_enum : unsigned long long { big_enum_value = 5000000000ULL };
TEST(FormatTest, StrongEnum) {
EXPECT_EQ("5000000000", fmt::format("{}", big_enum_value));
}
#endif
using buffer_range = fmt::buffer_range<char>;
class mock_arg_formatter
: public fmt::internal::arg_formatter_base<buffer_range> {
private:
#if FMT_USE_INT128
MOCK_METHOD1(call, void(__int128_t value));
#else
MOCK_METHOD1(call, void(long long value));
#endif
public:
typedef fmt::internal::arg_formatter_base<buffer_range> base;
typedef buffer_range range;
mock_arg_formatter(fmt::format_context& ctx, fmt::format_parse_context*,
fmt::format_specs* s = nullptr)
: base(fmt::internal::get_container(ctx.out()), s, ctx.locale()) {
EXPECT_CALL(*this, call(42));
}
template <typename T>
typename std::enable_if<fmt::internal::is_integral<T>::value, iterator>::type
operator()(T value) {
call(value);
return base::operator()(value);
}
template <typename T>
typename std::enable_if<!fmt::internal::is_integral<T>::value, iterator>::type
operator()(T value) {
return base::operator()(value);
}
iterator operator()(fmt::basic_format_arg<fmt::format_context>::handle) {
return base::operator()(fmt::monostate());
}
};
static void custom_vformat(fmt::string_view format_str, fmt::format_args args) {
fmt::memory_buffer buffer;
fmt::vformat_to<mock_arg_formatter>(buffer, format_str, args);
}
template <typename... Args>
void custom_format(const char* format_str, const Args&... args) {
auto va = fmt::make_format_args(args...);
return custom_vformat(format_str, va);
}
TEST(FormatTest, CustomArgFormatter) { custom_format("{}", 42); }
TEST(FormatTest, NonNullTerminatedFormatString) {
EXPECT_EQ("42", format(string_view("{}foo", 2), 42));
}
struct variant {
enum { INT, STRING } type;
explicit variant(int) : type(INT) {}
explicit variant(const char*) : type(STRING) {}
};
FMT_BEGIN_NAMESPACE
template <> struct formatter<variant> : dynamic_formatter<> {
auto format(variant value, format_context& ctx) -> decltype(ctx.out()) {
if (value.type == variant::INT) return dynamic_formatter<>::format(42, ctx);
return dynamic_formatter<>::format("foo", ctx);
}
};
FMT_END_NAMESPACE
TEST(FormatTest, DynamicFormatter) {
auto num = variant(42);
auto str = variant("foo");
EXPECT_EQ("42", format("{:d}", num));
EXPECT_EQ("foo", format("{:s}", str));
EXPECT_EQ(" 42 foo ", format("{:{}} {:{}}", num, 3, str, 4));
EXPECT_THROW_MSG(format("{0:{}}", num), format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG(format("{:{0}}", num), format_error,
"cannot switch from automatic to manual argument indexing");
#if FMT_NUMERIC_ALIGN
EXPECT_THROW_MSG(format("{:=}", str), format_error,
"format specifier requires numeric argument");
#endif
EXPECT_THROW_MSG(format("{:+}", str), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{:-}", str), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{: }", str), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{:#}", str), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{:0}", str), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{:.2}", num), format_error,
"precision not allowed for this argument type");
}
TEST(FormatTest, ToString) {
EXPECT_EQ("42", fmt::to_string(42));
EXPECT_EQ("0x1234", fmt::to_string(reinterpret_cast<void*>(0x1234)));
}
TEST(FormatTest, ToWString) { EXPECT_EQ(L"42", fmt::to_wstring(42)); }
TEST(FormatTest, OutputIterators) {
std::list<char> out;
fmt::format_to(std::back_inserter(out), "{}", 42);
EXPECT_EQ("42", std::string(out.begin(), out.end()));
std::stringstream s;
fmt::format_to(std::ostream_iterator<char>(s), "{}", 42);
EXPECT_EQ("42", s.str());
}
TEST(FormatTest, FormattedSize) {
EXPECT_EQ(2u, fmt::formatted_size("{}", 42));
}
TEST(FormatTest, FormatToN) {
char buffer[4];
buffer[3] = 'x';
auto result = fmt::format_to_n(buffer, 3, "{}", 12345);
EXPECT_EQ(5u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ("123x", fmt::string_view(buffer, 4));
result = fmt::format_to_n(buffer, 3, "{:s}", "foobar");
EXPECT_EQ(6u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ("foox", fmt::string_view(buffer, 4));
buffer[0] = 'x';
buffer[1] = 'x';
buffer[2] = 'x';
result = fmt::format_to_n(buffer, 3, "{}", 'A');
EXPECT_EQ(1u, result.size);
EXPECT_EQ(buffer + 1, result.out);
EXPECT_EQ("Axxx", fmt::string_view(buffer, 4));
result = fmt::format_to_n(buffer, 3, "{}{} ", 'B', 'C');
EXPECT_EQ(3u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ("BC x", fmt::string_view(buffer, 4));
}
TEST(FormatTest, WideFormatToN) {
wchar_t buffer[4];
buffer[3] = L'x';
auto result = fmt::format_to_n(buffer, 3, L"{}", 12345);
EXPECT_EQ(5u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ(L"123x", fmt::wstring_view(buffer, 4));
buffer[0] = L'x';
buffer[1] = L'x';
buffer[2] = L'x';
result = fmt::format_to_n(buffer, 3, L"{}", L'A');
EXPECT_EQ(1u, result.size);
EXPECT_EQ(buffer + 1, result.out);
EXPECT_EQ(L"Axxx", fmt::wstring_view(buffer, 4));
result = fmt::format_to_n(buffer, 3, L"{}{} ", L'B', L'C');
EXPECT_EQ(3u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ(L"BC x", fmt::wstring_view(buffer, 4));
}
#if FMT_USE_CONSTEXPR
struct test_arg_id_handler {
enum result { NONE, EMPTY, INDEX, NAME, ERROR };
result res = NONE;
unsigned index = 0;
string_view name;
FMT_CONSTEXPR void operator()() { res = EMPTY; }
FMT_CONSTEXPR void operator()(unsigned i) {
res = INDEX;
index = i;
}
FMT_CONSTEXPR void operator()(string_view n) {
res = NAME;
name = n;
}
FMT_CONSTEXPR void on_error(const char*) { res = ERROR; }
};
template <size_t N>
FMT_CONSTEXPR test_arg_id_handler parse_arg_id(const char (&s)[N]) {
test_arg_id_handler h;
fmt::internal::parse_arg_id(s, s + N, h);
return h;
}
TEST(FormatTest, ConstexprParseArgID) {
static_assert(parse_arg_id(":").res == test_arg_id_handler::EMPTY, "");
static_assert(parse_arg_id("}").res == test_arg_id_handler::EMPTY, "");
static_assert(parse_arg_id("42:").res == test_arg_id_handler::INDEX, "");
static_assert(parse_arg_id("42:").index == 42, "");
static_assert(parse_arg_id("foo:").res == test_arg_id_handler::NAME, "");
static_assert(parse_arg_id("foo:").name.size() == 3, "");
static_assert(parse_arg_id("!").res == test_arg_id_handler::ERROR, "");
}
struct test_format_specs_handler {
enum Result { NONE, PLUS, MINUS, SPACE, HASH, ZERO, ERROR };
Result res = NONE;
fmt::align_t align = fmt::align::none;
char fill = 0;
unsigned width = 0;
fmt::internal::arg_ref<char> width_ref;
unsigned precision = 0;
fmt::internal::arg_ref<char> precision_ref;
char type = 0;
// Workaround for MSVC2017 bug that results in "expression did not evaluate
// to a constant" with compiler-generated copy ctor.
FMT_CONSTEXPR test_format_specs_handler() {}
FMT_CONSTEXPR test_format_specs_handler(
const test_format_specs_handler& other)
: res(other.res),
align(other.align),
fill(other.fill),
width(other.width),
width_ref(other.width_ref),
precision(other.precision),
precision_ref(other.precision_ref),
type(other.type) {}
FMT_CONSTEXPR void on_align(fmt::align_t a) { align = a; }
FMT_CONSTEXPR void on_fill(char f) { fill = f; }
FMT_CONSTEXPR void on_plus() { res = PLUS; }
FMT_CONSTEXPR void on_minus() { res = MINUS; }
FMT_CONSTEXPR void on_space() { res = SPACE; }
FMT_CONSTEXPR void on_hash() { res = HASH; }
FMT_CONSTEXPR void on_zero() { res = ZERO; }
FMT_CONSTEXPR void on_width(unsigned w) { width = w; }
FMT_CONSTEXPR void on_dynamic_width(fmt::internal::auto_id) {}
FMT_CONSTEXPR void on_dynamic_width(unsigned index) { width_ref = index; }
FMT_CONSTEXPR void on_dynamic_width(string_view) {}
FMT_CONSTEXPR void on_precision(unsigned p) { precision = p; }
FMT_CONSTEXPR void on_dynamic_precision(fmt::internal::auto_id) {}
FMT_CONSTEXPR void on_dynamic_precision(unsigned index) {
precision_ref = index;
}
FMT_CONSTEXPR void on_dynamic_precision(string_view) {}
FMT_CONSTEXPR void end_precision() {}
FMT_CONSTEXPR void on_type(char t) { type = t; }
FMT_CONSTEXPR void on_error(const char*) { res = ERROR; }
};
template <size_t N>
FMT_CONSTEXPR test_format_specs_handler parse_test_specs(const char (&s)[N]) {
test_format_specs_handler h;
fmt::internal::parse_format_specs(s, s + N, h);
return h;
}
TEST(FormatTest, ConstexprParseFormatSpecs) {
typedef test_format_specs_handler handler;
static_assert(parse_test_specs("<").align == fmt::align::left, "");
static_assert(parse_test_specs("*^").fill == '*', "");
static_assert(parse_test_specs("+").res == handler::PLUS, "");
static_assert(parse_test_specs("-").res == handler::MINUS, "");
static_assert(parse_test_specs(" ").res == handler::SPACE, "");
static_assert(parse_test_specs("#").res == handler::HASH, "");
static_assert(parse_test_specs("0").res == handler::ZERO, "");
static_assert(parse_test_specs("42").width == 42, "");
static_assert(parse_test_specs("{42}").width_ref.val.index == 42, "");
static_assert(parse_test_specs(".42").precision == 42, "");
static_assert(parse_test_specs(".{42}").precision_ref.val.index == 42, "");
static_assert(parse_test_specs("d").type == 'd', "");
static_assert(parse_test_specs("{<").res == handler::ERROR, "");
}
struct test_parse_context {
typedef char char_type;
FMT_CONSTEXPR unsigned next_arg_id() { return 11; }
template <typename Id> FMT_CONSTEXPR void check_arg_id(Id) {}
FMT_CONSTEXPR const char* begin() { return nullptr; }
FMT_CONSTEXPR const char* end() { return nullptr; }
void on_error(const char*) {}
};
struct test_context {
typedef char char_type;
typedef fmt::basic_format_arg<test_context> format_arg;
template <typename T> struct formatter_type {
typedef fmt::formatter<T, char_type> type;
};
template <typename Id>
FMT_CONSTEXPR fmt::basic_format_arg<test_context> arg(Id id) {
return fmt::internal::make_arg<test_context>(id);
}
void on_error(const char*) {}
FMT_CONSTEXPR test_context error_handler() { return *this; }
};
template <size_t N>
FMT_CONSTEXPR fmt::format_specs parse_specs(const char (&s)[N]) {
fmt::format_specs specs;
test_parse_context parse_ctx;
test_context ctx{};
fmt::internal::specs_handler<test_parse_context, test_context> h(
specs, parse_ctx, ctx);
parse_format_specs(s, s + N, h);
return specs;
}
TEST(FormatTest, ConstexprSpecsHandler) {
static_assert(parse_specs("<").align == fmt::align::left, "");
static_assert(parse_specs("*^").fill[0] == '*', "");
static_assert(parse_specs("+").sign == fmt::sign::plus, "");
static_assert(parse_specs("-").sign == fmt::sign::minus, "");
static_assert(parse_specs(" ").sign == fmt::sign::space, "");
static_assert(parse_specs("#").alt, "");
static_assert(parse_specs("0").align == fmt::align::numeric, "");
static_assert(parse_specs("42").width == 42, "");
static_assert(parse_specs("{}").width == 11, "");
static_assert(parse_specs("{22}").width == 22, "");
static_assert(parse_specs(".42").precision == 42, "");
static_assert(parse_specs(".{}").precision == 11, "");
static_assert(parse_specs(".{22}").precision == 22, "");
static_assert(parse_specs("d").type == 'd', "");
}
template <size_t N>
FMT_CONSTEXPR fmt::internal::dynamic_format_specs<char> parse_dynamic_specs(
const char (&s)[N]) {
fmt::internal::dynamic_format_specs<char> specs;
test_parse_context ctx{};
fmt::internal::dynamic_specs_handler<test_parse_context> h(specs, ctx);
parse_format_specs(s, s + N, h);
return specs;
}
TEST(FormatTest, ConstexprDynamicSpecsHandler) {
static_assert(parse_dynamic_specs("<").align == fmt::align::left, "");
static_assert(parse_dynamic_specs("*^").fill[0] == '*', "");
static_assert(parse_dynamic_specs("+").sign == fmt::sign::plus, "");
static_assert(parse_dynamic_specs("-").sign == fmt::sign::minus, "");
static_assert(parse_dynamic_specs(" ").sign == fmt::sign::space, "");
static_assert(parse_dynamic_specs("#").alt, "");
static_assert(parse_dynamic_specs("0").align == fmt::align::numeric, "");
static_assert(parse_dynamic_specs("42").width == 42, "");
static_assert(parse_dynamic_specs("{}").width_ref.val.index == 11, "");
static_assert(parse_dynamic_specs("{42}").width_ref.val.index == 42, "");
static_assert(parse_dynamic_specs(".42").precision == 42, "");
static_assert(parse_dynamic_specs(".{}").precision_ref.val.index == 11, "");
static_assert(parse_dynamic_specs(".{42}").precision_ref.val.index == 42, "");
static_assert(parse_dynamic_specs("d").type == 'd', "");
}
template <size_t N>
FMT_CONSTEXPR test_format_specs_handler check_specs(const char (&s)[N]) {
fmt::internal::specs_checker<test_format_specs_handler> checker(
test_format_specs_handler(), fmt::internal::double_type);
parse_format_specs(s, s + N, checker);
return checker;
}
TEST(FormatTest, ConstexprSpecsChecker) {
typedef test_format_specs_handler handler;
static_assert(check_specs("<").align == fmt::align::left, "");
static_assert(check_specs("*^").fill == '*', "");
static_assert(check_specs("+").res == handler::PLUS, "");
static_assert(check_specs("-").res == handler::MINUS, "");
static_assert(check_specs(" ").res == handler::SPACE, "");
static_assert(check_specs("#").res == handler::HASH, "");
static_assert(check_specs("0").res == handler::ZERO, "");
static_assert(check_specs("42").width == 42, "");
static_assert(check_specs("{42}").width_ref.val.index == 42, "");
static_assert(check_specs(".42").precision == 42, "");
static_assert(check_specs(".{42}").precision_ref.val.index == 42, "");
static_assert(check_specs("d").type == 'd', "");
static_assert(check_specs("{<").res == handler::ERROR, "");
}
struct test_format_string_handler {
FMT_CONSTEXPR void on_text(const char*, const char*) {}
FMT_CONSTEXPR void on_arg_id() {}
template <typename T> FMT_CONSTEXPR void on_arg_id(T) {}
FMT_CONSTEXPR void on_replacement_field(const char*) {}
FMT_CONSTEXPR const char* on_format_specs(const char* begin, const char*) {
return begin;
}
FMT_CONSTEXPR void on_end_of_string() {}
FMT_CONSTEXPR void on_error(const char*) { error = true; }
bool error = false;
};
template <size_t N> FMT_CONSTEXPR bool parse_string(const char (&s)[N]) {
test_format_string_handler h;
fmt::internal::parse_format_string<true>(fmt::string_view(s, N - 1), h);
return !h.error;
}
TEST(FormatTest, ConstexprParseFormatString) {
static_assert(parse_string("foo"), "");
static_assert(!parse_string("}"), "");
static_assert(parse_string("{}"), "");
static_assert(parse_string("{42}"), "");
static_assert(parse_string("{foo}"), "");
static_assert(parse_string("{:}"), "");
}
struct test_error_handler {
const char*& error;
FMT_CONSTEXPR test_error_handler(const char*& err) : error(err) {}
FMT_CONSTEXPR test_error_handler(const test_error_handler& other)
: error(other.error) {}
FMT_CONSTEXPR void on_error(const char* message) {
if (!error) error = message;
}
};
FMT_CONSTEXPR size_t len(const char* s) {
size_t len = 0;
while (*s++) ++len;
return len;
}
FMT_CONSTEXPR bool equal(const char* s1, const char* s2) {
if (!s1 || !s2) return s1 == s2;
while (*s1 && *s1 == *s2) {
++s1;
++s2;
}
return *s1 == *s2;
}
template <typename... Args>
FMT_CONSTEXPR bool test_error(const char* fmt, const char* expected_error) {
const char* actual_error = nullptr;
fmt::internal::do_check_format_string<char, test_error_handler, Args...>(
string_view(fmt, len(fmt)), test_error_handler(actual_error));
return equal(actual_error, expected_error);
}
# define EXPECT_ERROR_NOARGS(fmt, error) \
static_assert(test_error(fmt, error), "")
# define EXPECT_ERROR(fmt, error, ...) \
static_assert(test_error<__VA_ARGS__>(fmt, error), "")
TEST(FormatTest, FormatStringErrors) {
EXPECT_ERROR_NOARGS("foo", nullptr);
EXPECT_ERROR_NOARGS("}", "unmatched '}' in format string");
EXPECT_ERROR("{0:s", "unknown format specifier", Date);
# if FMT_MSC_VER >= 1916
// This causes an internal compiler error in MSVC2017.
EXPECT_ERROR("{:{<}", "invalid fill character '{'", int);
EXPECT_ERROR("{:10000000000}", "number is too big", int);
EXPECT_ERROR("{:.10000000000}", "number is too big", int);
EXPECT_ERROR_NOARGS("{:x}", "argument index out of range");
#if FMT_NUMERIC_ALIGN
EXPECT_ERROR("{0:=5", "unknown format specifier", int);
EXPECT_ERROR("{:=}", "format specifier requires numeric argument",
const char*);
#endif
EXPECT_ERROR("{:+}", "format specifier requires numeric argument",
const char*);
EXPECT_ERROR("{:-}", "format specifier requires numeric argument",
const char*);
EXPECT_ERROR("{:#}", "format specifier requires numeric argument",
const char*);
EXPECT_ERROR("{: }", "format specifier requires numeric argument",
const char*);
EXPECT_ERROR("{:0}", "format specifier requires numeric argument",
const char*);
EXPECT_ERROR("{:+}", "format specifier requires signed argument", unsigned);
EXPECT_ERROR("{:-}", "format specifier requires signed argument", unsigned);
EXPECT_ERROR("{: }", "format specifier requires signed argument", unsigned);
EXPECT_ERROR("{:.2}", "precision not allowed for this argument type", int);
EXPECT_ERROR("{:s}", "invalid type specifier", int);
EXPECT_ERROR("{:s}", "invalid type specifier", bool);
EXPECT_ERROR("{:s}", "invalid type specifier", char);
EXPECT_ERROR("{:+}", "invalid format specifier for char", char);
EXPECT_ERROR("{:s}", "invalid type specifier", double);
EXPECT_ERROR("{:d}", "invalid type specifier", const char*);
EXPECT_ERROR("{:d}", "invalid type specifier", std::string);
EXPECT_ERROR("{:s}", "invalid type specifier", void*);
# else
fmt::print("warning: constexpr is broken in this version of MSVC\n");
# endif
EXPECT_ERROR("{foo", "compile-time checks don't support named arguments",
int);
EXPECT_ERROR_NOARGS("{10000000000}", "number is too big");
EXPECT_ERROR_NOARGS("{0x}", "invalid format string");
EXPECT_ERROR_NOARGS("{-}", "invalid format string");
EXPECT_ERROR("{:{0x}}", "invalid format string", int);
EXPECT_ERROR("{:{-}}", "invalid format string", int);
EXPECT_ERROR("{:.{0x}}", "invalid format string", int);
EXPECT_ERROR("{:.{-}}", "invalid format string", int);
EXPECT_ERROR("{:.x}", "missing precision specifier", int);
EXPECT_ERROR_NOARGS("{}", "argument index out of range");
EXPECT_ERROR("{1}", "argument index out of range", int);
EXPECT_ERROR("{1}{}",
"cannot switch from manual to automatic argument indexing", int,
int);
EXPECT_ERROR("{}{1}",
"cannot switch from automatic to manual argument indexing", int,
int);
EXPECT_ERROR("", "number of arguments in format string is less than number of arguments provided", int);
EXPECT_ERROR("{}", "number of arguments in format string is less than number of arguments provided", int, int);
}
TEST(FormatTest, VFormatTo) {
typedef fmt::format_context context;
fmt::basic_format_arg<context> arg = fmt::internal::make_arg<context>(42);
fmt::basic_format_args<context> args(&arg, 1);
std::string s;
fmt::vformat_to(std::back_inserter(s), "{}", args);
EXPECT_EQ("42", s);
s.clear();
fmt::vformat_to(std::back_inserter(s), FMT_STRING("{}"), args);
EXPECT_EQ("42", s);
typedef fmt::wformat_context wcontext;
fmt::basic_format_arg<wcontext> warg = fmt::internal::make_arg<wcontext>(42);
fmt::basic_format_args<wcontext> wargs(&warg, 1);
std::wstring w;
fmt::vformat_to(std::back_inserter(w), L"{}", wargs);
EXPECT_EQ(L"42", w);
w.clear();
fmt::vformat_to(std::back_inserter(w), FMT_STRING(L"{}"), wargs);
EXPECT_EQ(L"42", w);
}
template <typename T> static std::string FmtToString(const T& t) {
return fmt::format(FMT_STRING("{}"), t);
}
TEST(FormatTest, FmtStringInTemplate) {
EXPECT_EQ(FmtToString(1), "1");
EXPECT_EQ(FmtToString(0), "0");
}
#endif // FMT_USE_CONSTEXPR
// C++20 feature test, since r346892 Clang considers char8_t a fundamental
// type in this mode. If this is the case __cpp_char8_t will be defined.
#ifndef __cpp_char8_t
// Locally provide type char8_t defined in format.h
using fmt::char8_t;
#endif
TEST(FormatTest, ConstructU8StringViewFromCString) {
fmt::u8string_view s("ab");
EXPECT_EQ(s.size(), 2u);
const char8_t* data = s.data();
EXPECT_EQ(data[0], 'a');
EXPECT_EQ(data[1], 'b');
}
TEST(FormatTest, ConstructU8StringViewFromDataAndSize) {
fmt::u8string_view s("foobar", 3);
EXPECT_EQ(s.size(), 3u);
const char8_t* data = s.data();
EXPECT_EQ(data[0], 'f');
EXPECT_EQ(data[1], 'o');
EXPECT_EQ(data[2], 'o');
}
#if FMT_USE_USER_DEFINED_LITERALS
TEST(FormatTest, U8StringViewLiteral) {
using namespace fmt::literals;
fmt::u8string_view s = "ab"_u;
EXPECT_EQ(s.size(), 2u);
const char8_t* data = s.data();
EXPECT_EQ(data[0], 'a');
EXPECT_EQ(data[1], 'b');
EXPECT_EQ(format("{:*^5}"_u, "🤡"_u), "**🤡**"_u);
}
#endif
TEST(FormatTest, FormatU8String) {
EXPECT_EQ(format(fmt::u8string_view("{}"), 42), fmt::u8string_view("42"));
}
TEST(FormatTest, EmphasisNonHeaderOnly) {
// ensure this compiles even if FMT_HEADER_ONLY is not defined.
EXPECT_EQ(fmt::format(fmt::emphasis::bold, "bold error"),
"\x1b[1mbold error\x1b[0m");
}
TEST(FormatTest, CharTraitsIsNotAmbiguous) {
// Test that we don't inject internal names into the std namespace.
using namespace std;
char_traits<char>::char_type c;
(void)c;
#if __cplusplus >= 201103L
std::string s;
auto lval = begin(s);
(void)lval;
#endif
}
struct mychar {
int value;
mychar() = default;
template <typename T> mychar(T val) : value(static_cast<int>(val)) {}
operator int() const { return value; }
};
FMT_BEGIN_NAMESPACE
template <> struct is_char<mychar> : std::true_type {};
FMT_END_NAMESPACE
TEST(FormatTest, FormatCustomChar) {
const mychar format[] = {'{', '}', 0};
auto result = fmt::format(format, mychar('x'));
EXPECT_EQ(result.size(), 1);
EXPECT_EQ(result[0], mychar('x'));
}
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