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fmt/test/format-test.cc

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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.
// Check if fmt/format.h compiles with windows.h included before it.
#ifdef _WIN32
# include <windows.h>
#endif
// clang-format off
#include "fmt/format.h"
// clang-format on
#include <stdint.h> // uint32_t
#include <climits> // INT_MAX
#include <cmath> // std::signbit
#include <cstring> // std::strlen
#include <iterator> // std::back_inserter
#include <list> // std::list
#include <memory> // std::unique_ptr
#include <type_traits> // std::is_default_constructible
#include "gtest-extra.h"
#include "mock-allocator.h"
#include "util.h"
using fmt::basic_memory_buffer;
using fmt::format_error;
using fmt::memory_buffer;
using fmt::string_view;
using fmt::detail::max_value;
using testing::Return;
using testing::StrictMock;
enum { buffer_size = 256 };
struct uint32_pair {
uint32_t u[2];
};
TEST(util_test, bit_cast) {
auto s = fmt::detail::bit_cast<uint32_pair>(uint64_t{42});
EXPECT_EQ(fmt::detail::bit_cast<uint64_t>(s), 42ull);
s = fmt::detail::bit_cast<uint32_pair>(~uint64_t{0});
EXPECT_EQ(fmt::detail::bit_cast<uint64_t>(s), ~0ull);
}
// Increment a number in a string.
void increment(char* s) {
for (int i = static_cast<int>(std::strlen(s)) - 1; i >= 0; --i) {
if (s[i] != '9') {
++s[i];
break;
}
s[i] = '0';
}
}
TEST(util_test, 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(util_test, parse_nonnegative_int) {
auto s = fmt::string_view("10000000000");
auto begin = s.begin(), end = s.end();
EXPECT_THROW_MSG(
parse_nonnegative_int(begin, end, fmt::detail::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::detail::error_handler()),
fmt::format_error, "number is too big");
}
TEST(util_test, utf8_to_utf16) {
auto u = fmt::detail::utf8_to_utf16("лошадка");
EXPECT_EQ(L"\x043B\x043E\x0448\x0430\x0434\x043A\x0430", u.str());
EXPECT_EQ(7, u.size());
// U+10437 { DESERET SMALL LETTER YEE }
EXPECT_EQ(L"\xD801\xDC37", fmt::detail::utf8_to_utf16("𐐷").str());
EXPECT_THROW_MSG(fmt::detail::utf8_to_utf16("\xc3\x28"), std::runtime_error,
"invalid utf8");
EXPECT_THROW_MSG(fmt::detail::utf8_to_utf16(fmt::string_view("л", 1)),
std::runtime_error, "invalid utf8");
EXPECT_EQ(L"123456", fmt::detail::utf8_to_utf16("123456").str());
}
TEST(util_test, utf8_to_utf16_empty_string) {
auto s = std::string();
auto u = fmt::detail::utf8_to_utf16(s.c_str());
EXPECT_EQ(L"", u.str());
EXPECT_EQ(s.size(), u.size());
}
TEST(util_test, allocator_ref) {
using test_allocator_ref = allocator_ref<mock_allocator<int>>;
auto check_forwarding = [](mock_allocator<int>& alloc,
test_allocator_ref& 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(Return(ptr));
ref.allocate(42);
EXPECT_CALL(alloc, deallocate(ptr, 42));
ref.deallocate(ptr, 42);
};
StrictMock<mock_allocator<int>> alloc;
auto ref = test_allocator_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);
}
TEST(util_test, format_system_error) {
fmt::memory_buffer message;
fmt::format_system_error(message, EDOM, "test");
auto ec = std::error_code(EDOM, std::generic_category());
EXPECT_EQ(to_string(message), std::system_error(ec, "test").what());
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 {
auto alloc = std::allocator<char>();
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;
}
}
TEST(util_test, system_error) {
auto test_error = fmt::system_error(EDOM, "test");
auto ec = std::error_code(EDOM, std::generic_category());
EXPECT_STREQ(test_error.what(), std::system_error(ec, "test").what());
EXPECT_EQ(test_error.code(), ec);
auto error = std::system_error(std::error_code());
try {
throw fmt::system_error(EDOM, "test {}", "error");
} catch (const std::system_error& e) {
error = e;
}
fmt::memory_buffer message;
fmt::format_system_error(message, EDOM, "test error");
EXPECT_EQ(error.what(), to_string(message));
EXPECT_EQ(error.code(), std::error_code(EDOM, std::generic_category()));
}
TEST(util_test, report_system_error) {
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));
}
TEST(memory_buffer_test, ctor) {
basic_memory_buffer<char, 123> buffer;
EXPECT_EQ(static_cast<size_t>(0), buffer.size());
EXPECT_EQ(123u, buffer.capacity());
}
using std_allocator = allocator_ref<std::allocator<char>>;
TEST(memory_buffer_test, move_ctor_inline_buffer) {
auto check_move_buffer =
[](const char* str, basic_memory_buffer<char, 5, std_allocator>& buffer) {
std::allocator<char>* alloc = buffer.get_allocator().get();
basic_memory_buffer<char, 5, std_allocator> 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());
};
auto alloc = std::allocator<char>();
basic_memory_buffer<char, 5, std_allocator> buffer((std_allocator(&alloc)));
const char test[] = "test";
buffer.append(string_view(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);
}
TEST(memory_buffer_test, move_ctor_dynamic_buffer) {
auto alloc = std::allocator<char>();
basic_memory_buffer<char, 4, std_allocator> buffer((std_allocator(&alloc)));
const char test[] = "test";
buffer.append(test, test + 4);
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('a');
basic_memory_buffer<char, 4, std_allocator> buffer2(std::move(buffer));
// Move should rip the guts of the first buffer.
EXPECT_EQ(inline_buffer_ptr, &buffer[0]);
EXPECT_EQ("testa", std::string(&buffer2[0], buffer2.size()));
EXPECT_GT(buffer2.capacity(), 4u);
}
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(memory_buffer_test, move_assignment) {
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(memory_buffer_test, grow) {
typedef allocator_ref<mock_allocator<int>> Allocator;
mock_allocator<int> alloc;
basic_memory_buffer<int, 10, Allocator> buffer((Allocator(&alloc)));
buffer.resize(7);
using fmt::detail::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.try_reserve(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(memory_buffer_test, allocator) {
using test_allocator = allocator_ref<mock_allocator<char>>;
basic_memory_buffer<char, 10, test_allocator> buffer;
EXPECT_EQ(nullptr, buffer.get_allocator().get());
StrictMock<mock_allocator<char>> alloc;
char mem;
{
basic_memory_buffer<char, 10, test_allocator> buffer2(
(test_allocator(&alloc)));
EXPECT_EQ(&alloc, buffer2.get_allocator().get());
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(memory_buffer_test, exception_in_deallocate) {
using test_allocator = allocator_ref<mock_allocator<char>>;
StrictMock<mock_allocator<char>> alloc;
basic_memory_buffer<char, 10, test_allocator> buffer(
(test_allocator(&alloc)));
size_t size = 2 * fmt::inline_buffer_size;
auto mem = std::vector<char>(size);
{
EXPECT_CALL(alloc, allocate(size)).WillOnce(Return(&mem[0]));
buffer.resize(size);
std::fill(&buffer[0], &buffer[0] + size, 'x');
}
auto mem2 = std::vector<char>(2 * size);
{
EXPECT_CALL(alloc, allocate(2 * size)).WillOnce(Return(&mem2[0]));
auto e = std::exception();
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 (size_t i = 0; i < size; ++i) EXPECT_EQ('x', buffer[i]);
}
EXPECT_CALL(alloc, deallocate(&mem2[0], 2 * size));
}
template <typename Allocator, size_t MaxSize>
class max_size_allocator : public Allocator {
public:
using typename Allocator::value_type;
size_t max_size() const FMT_NOEXCEPT { return MaxSize; }
value_type* allocate(size_t n) {
if (n > max_size()) {
throw std::length_error("size > max_size");
}
return std::allocator_traits<Allocator>::allocate(
*static_cast<Allocator*>(this), n);
}
void deallocate(value_type* p, size_t n) {
std::allocator_traits<Allocator>::deallocate(*static_cast<Allocator*>(this),
p, n);
}
};
TEST(memory_buffer_test, max_size_allocator) {
// 160 = 128 + 32
using test_allocator = max_size_allocator<std::allocator<char>, 160>;
basic_memory_buffer<char, 10, test_allocator> buffer;
buffer.resize(128);
// new_capacity = 128 + 128/2 = 192 > 160
buffer.resize(160); // Shouldn't throw.
}
TEST(memory_buffer_test, max_size_allocator_overflow) {
using test_allocator = max_size_allocator<std::allocator<char>, 160>;
basic_memory_buffer<char, 10, test_allocator> buffer;
EXPECT_THROW(buffer.resize(161), std::exception);
}
TEST(format_test, escape) {
EXPECT_EQ("{", fmt::format("{{"));
EXPECT_EQ("before {", fmt::format("before {{"));
EXPECT_EQ("{ after", fmt::format("{{ after"));
EXPECT_EQ("before { after", fmt::format("before {{ after"));
EXPECT_EQ("}", fmt::format("}}"));
EXPECT_EQ("before }", fmt::format("before }}"));
EXPECT_EQ("} after", fmt::format("}} after"));
EXPECT_EQ("before } after", fmt::format("before }} after"));
EXPECT_EQ("{}", fmt::format("{{}}"));
EXPECT_EQ("{42}", fmt::format("{{{0}}}", 42));
}
TEST(format_test, unmatched_braces) {
EXPECT_THROW_MSG(fmt::format(+"{"), format_error, "invalid format string");
EXPECT_THROW_MSG(fmt::format(+"}"), format_error,
"unmatched '}' in format string");
EXPECT_THROW_MSG(fmt::format(+"{0{}"), format_error, "invalid format string");
}
TEST(format_test, no_args) { EXPECT_EQ("test", fmt::format("test")); }
TEST(format_test, args_in_different_positions) {
EXPECT_EQ("42", fmt::format("{0}", 42));
EXPECT_EQ("before 42", fmt::format("before {0}", 42));
EXPECT_EQ("42 after", fmt::format("{0} after", 42));
EXPECT_EQ("before 42 after", fmt::format("before {0} after", 42));
EXPECT_EQ("answer = 42", fmt::format("{0} = {1}", "answer", 42));
EXPECT_EQ("42 is the answer", fmt::format("{1} is the {0}", "answer", 42));
EXPECT_EQ("abracadabra", fmt::format("{0}{1}{0}", "abra", "cad"));
}
TEST(format_test, arg_errors) {
EXPECT_THROW_MSG(fmt::format(+"{"), format_error, "invalid format string");
EXPECT_THROW_MSG(fmt::format(+"{?}"), format_error, "invalid format string");
EXPECT_THROW_MSG(fmt::format(+"{0"), format_error, "invalid format string");
EXPECT_THROW_MSG(fmt::format(+"{0}"), format_error, "argument not found");
EXPECT_THROW_MSG(fmt::format(+"{00}", 42), format_error,
"invalid format string");
char format_str[buffer_size];
safe_sprintf(format_str, "{%u", INT_MAX);
EXPECT_THROW_MSG(fmt::format(+format_str), format_error,
"invalid format string");
safe_sprintf(format_str, "{%u}", INT_MAX);
EXPECT_THROW_MSG(fmt::format(+format_str), format_error,
"argument not found");
safe_sprintf(format_str, "{%u", INT_MAX + 1u);
EXPECT_THROW_MSG(fmt::format(+format_str), format_error, "number is too big");
safe_sprintf(format_str, "{%u}", INT_MAX + 1u);
EXPECT_THROW_MSG(fmt::format(+format_str), format_error, "number is too big");
}
template <int N> struct test_format {
template <typename... Args>
static std::string format(fmt::string_view format_str, const Args&... args) {
return test_format<N - 1>::format(format_str, N - 1, args...);
}
};
template <> struct test_format<0> {
template <typename... Args>
static std::string format(fmt::string_view format_str, const Args&... args) {
return fmt::format(format_str, args...);
}
};
TEST(format_test, many_args) {
EXPECT_EQ("19", test_format<20>::format("{19}"));
EXPECT_THROW_MSG(test_format<20>::format("{20}"), format_error,
"argument not found");
EXPECT_THROW_MSG(test_format<21>::format("{21}"), format_error,
"argument not found");
using fmt::detail::max_packed_args;
std::string format_str = fmt::format("{{{}}}", max_packed_args + 1);
EXPECT_THROW_MSG(test_format<max_packed_args>::format(format_str),
format_error, "argument not found");
}
TEST(format_test, named_arg) {
EXPECT_EQ("1/a/A", fmt::format("{_1}/{a_}/{A_}", fmt::arg("a_", 'a'),
fmt::arg("A_", "A"), fmt::arg("_1", 1)));
EXPECT_EQ(" -42", fmt::format("{0:{width}}", -42, fmt::arg("width", 4)));
EXPECT_EQ("st",
fmt::format("{0:.{precision}}", "str", fmt::arg("precision", 2)));
EXPECT_EQ("1 2", fmt::format("{} {two}", 1, fmt::arg("two", 2)));
EXPECT_EQ("42",
fmt::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)));
EXPECT_THROW_MSG(fmt::format(+"{a}"), format_error, "argument not found");
EXPECT_THROW_MSG(fmt::format(+"{a}", 42), format_error, "argument not found");
}
TEST(format_test, auto_arg_index) {
EXPECT_EQ("abc", fmt::format("{}{}{}", 'a', 'b', 'c'));
EXPECT_THROW_MSG(fmt::format(+"{0}{}", 'a', 'b'), format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG(fmt::format(+"{}{0}", 'a', 'b'), format_error,
"cannot switch from automatic to manual argument indexing");
EXPECT_EQ("1.2", fmt::format("{:.{}}", 1.2345, 2));
EXPECT_THROW_MSG(fmt::format(+"{0}:.{}", 1.2345, 2), format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG(fmt::format(+"{:.{0}}", 1.2345, 2), format_error,
"cannot switch from automatic to manual argument indexing");
EXPECT_THROW_MSG(fmt::format(+"{}"), format_error, "argument not found");
}
TEST(format_test, empty_specs) { EXPECT_EQ("42", fmt::format("{0:}", 42)); }
TEST(format_test, left_align) {
EXPECT_EQ("42 ", fmt::format("{0:<4}", 42));
EXPECT_EQ("42 ", fmt::format("{0:<4o}", 042));
EXPECT_EQ("42 ", fmt::format("{0:<4x}", 0x42));
EXPECT_EQ("-42 ", fmt::format("{0:<5}", -42));
EXPECT_EQ("42 ", fmt::format("{0:<5}", 42u));
EXPECT_EQ("-42 ", fmt::format("{0:<5}", -42l));
EXPECT_EQ("42 ", fmt::format("{0:<5}", 42ul));
EXPECT_EQ("-42 ", fmt::format("{0:<5}", -42ll));
EXPECT_EQ("42 ", fmt::format("{0:<5}", 42ull));
EXPECT_EQ("-42 ", fmt::format("{0:<5}", -42.0));
EXPECT_EQ("-42 ", fmt::format("{0:<5}", -42.0l));
EXPECT_EQ("c ", fmt::format("{0:<5}", 'c'));
EXPECT_EQ("abc ", fmt::format("{0:<5}", "abc"));
EXPECT_EQ("0xface ", fmt::format("{0:<8}", reinterpret_cast<void*>(0xface)));
}
TEST(format_test, right_align) {
EXPECT_EQ(" 42", fmt::format("{0:>4}", 42));
EXPECT_EQ(" 42", fmt::format("{0:>4o}", 042));
EXPECT_EQ(" 42", fmt::format("{0:>4x}", 0x42));
EXPECT_EQ(" -42", fmt::format("{0:>5}", -42));
EXPECT_EQ(" 42", fmt::format("{0:>5}", 42u));
EXPECT_EQ(" -42", fmt::format("{0:>5}", -42l));
EXPECT_EQ(" 42", fmt::format("{0:>5}", 42ul));
EXPECT_EQ(" -42", fmt::format("{0:>5}", -42ll));
EXPECT_EQ(" 42", fmt::format("{0:>5}", 42ull));
EXPECT_EQ(" -42", fmt::format("{0:>5}", -42.0));
EXPECT_EQ(" -42", fmt::format("{0:>5}", -42.0l));
EXPECT_EQ(" c", fmt::format("{0:>5}", 'c'));
EXPECT_EQ(" abc", fmt::format("{0:>5}", "abc"));
EXPECT_EQ(" 0xface", fmt::format("{0:>8}", reinterpret_cast<void*>(0xface)));
}
TEST(format_test, center_align) {
EXPECT_EQ(" 42 ", fmt::format("{0:^5}", 42));
EXPECT_EQ(" 42 ", fmt::format("{0:^5o}", 042));
EXPECT_EQ(" 42 ", fmt::format("{0:^5x}", 0x42));
EXPECT_EQ(" -42 ", fmt::format("{0:^5}", -42));
EXPECT_EQ(" 42 ", fmt::format("{0:^5}", 42u));
EXPECT_EQ(" -42 ", fmt::format("{0:^5}", -42l));
EXPECT_EQ(" 42 ", fmt::format("{0:^5}", 42ul));
EXPECT_EQ(" -42 ", fmt::format("{0:^5}", -42ll));
EXPECT_EQ(" 42 ", fmt::format("{0:^5}", 42ull));
EXPECT_EQ(" -42 ", fmt::format("{0:^5}", -42.0));
EXPECT_EQ(" -42 ", fmt::format("{0:^5}", -42.0l));
EXPECT_EQ(" c ", fmt::format("{0:^5}", 'c'));
EXPECT_EQ(" abc ", fmt::format("{0:^6}", "abc"));
EXPECT_EQ(" 0xface ", fmt::format("{0:^8}", reinterpret_cast<void*>(0xface)));
}
TEST(format_test, fill) {
EXPECT_THROW_MSG(fmt::format(+"{0:{<5}", 'c'), format_error,
"invalid fill character '{'");
EXPECT_THROW_MSG(fmt::format(+"{0:{<5}}", 'c'), format_error,
"invalid fill character '{'");
EXPECT_EQ("**42", fmt::format("{0:*>4}", 42));
EXPECT_EQ("**-42", fmt::format("{0:*>5}", -42));
EXPECT_EQ("***42", fmt::format("{0:*>5}", 42u));
EXPECT_EQ("**-42", fmt::format("{0:*>5}", -42l));
EXPECT_EQ("***42", fmt::format("{0:*>5}", 42ul));
EXPECT_EQ("**-42", fmt::format("{0:*>5}", -42ll));
EXPECT_EQ("***42", fmt::format("{0:*>5}", 42ull));
EXPECT_EQ("**-42", fmt::format("{0:*>5}", -42.0));
EXPECT_EQ("**-42", fmt::format("{0:*>5}", -42.0l));
EXPECT_EQ("c****", fmt::format("{0:*<5}", 'c'));
EXPECT_EQ("abc**", fmt::format("{0:*<5}", "abc"));
EXPECT_EQ("**0xface",
fmt::format("{0:*>8}", reinterpret_cast<void*>(0xface)));
EXPECT_EQ("foo=", fmt::format("{:}=", "foo"));
EXPECT_EQ(std::string("\0\0\0*", 4),
fmt::format(string_view("{:\0>4}", 6), '*'));
EXPECT_EQ("жж42", fmt::format("{0:ж>4}", 42));
EXPECT_THROW_MSG(fmt::format(+"{:\x80\x80\x80\x80\x80>}", 0), format_error,
"missing '}' in format string");
}
TEST(format_test, plus_sign) {
EXPECT_EQ("+42", fmt::format("{0:+}", 42));
EXPECT_EQ("-42", fmt::format("{0:+}", -42));
EXPECT_EQ("+42", fmt::format("{0:+}", 42));
EXPECT_THROW_MSG(fmt::format(+"{0:+}", 42u), format_error,
"format specifier requires signed argument");
EXPECT_EQ("+42", fmt::format("{0:+}", 42l));
EXPECT_THROW_MSG(fmt::format(+"{0:+}", 42ul), format_error,
"format specifier requires signed argument");
EXPECT_EQ("+42", fmt::format("{0:+}", 42ll));
EXPECT_THROW_MSG(fmt::format(+"{0:+}", 42ull), format_error,
"format specifier requires signed argument");
EXPECT_EQ("+42", fmt::format("{0:+}", 42.0));
EXPECT_EQ("+42", fmt::format("{0:+}", 42.0l));
EXPECT_THROW_MSG(fmt::format(+"{0:+", 'c'), format_error,
"missing '}' in format string");
EXPECT_THROW_MSG(fmt::format(+"{0:+}", 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG(fmt::format(+"{0:+}", "abc"), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(fmt::format(+"{0:+}", reinterpret_cast<void*>(0x42)),
format_error, "format specifier requires numeric argument");
}
TEST(format_test, minus_sign) {
EXPECT_EQ("42", fmt::format("{0:-}", 42));
EXPECT_EQ("-42", fmt::format("{0:-}", -42));
EXPECT_EQ("42", fmt::format("{0:-}", 42));
EXPECT_THROW_MSG(fmt::format(+"{0:-}", 42u), format_error,
"format specifier requires signed argument");
EXPECT_EQ("42", fmt::format("{0:-}", 42l));
EXPECT_THROW_MSG(fmt::format(+"{0:-}", 42ul), format_error,
"format specifier requires signed argument");
EXPECT_EQ("42", fmt::format("{0:-}", 42ll));
EXPECT_THROW_MSG(fmt::format(+"{0:-}", 42ull), format_error,
"format specifier requires signed argument");
EXPECT_EQ("42", fmt::format("{0:-}", 42.0));
EXPECT_EQ("42", fmt::format("{0:-}", 42.0l));
EXPECT_THROW_MSG(fmt::format(+"{0:-", 'c'), format_error,
"missing '}' in format string");
EXPECT_THROW_MSG(fmt::format(+"{0:-}", 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG(fmt::format(+"{0:-}", "abc"), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(fmt::format(+"{0:-}", reinterpret_cast<void*>(0x42)),
format_error, "format specifier requires numeric argument");
}
TEST(format_test, space_sign) {
EXPECT_EQ(" 42", fmt::format("{0: }", 42));
EXPECT_EQ("-42", fmt::format("{0: }", -42));
EXPECT_EQ(" 42", fmt::format("{0: }", 42));
EXPECT_THROW_MSG(fmt::format(+"{0: }", 42u), format_error,
"format specifier requires signed argument");
EXPECT_EQ(" 42", fmt::format("{0: }", 42l));
EXPECT_THROW_MSG(fmt::format(+"{0: }", 42ul), format_error,
"format specifier requires signed argument");
EXPECT_EQ(" 42", fmt::format("{0: }", 42ll));
EXPECT_THROW_MSG(fmt::format(+"{0: }", 42ull), format_error,
"format specifier requires signed argument");
EXPECT_EQ(" 42", fmt::format("{0: }", 42.0));
EXPECT_EQ(" 42", fmt::format("{0: }", 42.0l));
EXPECT_THROW_MSG(fmt::format(+"{0: ", 'c'), format_error,
"missing '}' in format string");
EXPECT_THROW_MSG(fmt::format(+"{0: }", 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG(fmt::format(+"{0: }", "abc"), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(fmt::format(+"{0: }", reinterpret_cast<void*>(0x42)),
format_error, "format specifier requires numeric argument");
}
TEST(format_test, sign_not_truncated) {
wchar_t format_str[] = {
L'{', L':',
'+' | static_cast<wchar_t>(1 << fmt::detail::num_bits<char>()), L'}', 0};
EXPECT_THROW(fmt::format(format_str, 42), format_error);
}
TEST(format_test, hash_flag) {
EXPECT_EQ("42", fmt::format("{0:#}", 42));
EXPECT_EQ("-42", fmt::format("{0:#}", -42));
EXPECT_EQ("0b101010", fmt::format("{0:#b}", 42));
EXPECT_EQ("0B101010", fmt::format("{0:#B}", 42));
EXPECT_EQ("-0b101010", fmt::format("{0:#b}", -42));
EXPECT_EQ("0x42", fmt::format("{0:#x}", 0x42));
EXPECT_EQ("0X42", fmt::format("{0:#X}", 0x42));
EXPECT_EQ("-0x42", fmt::format("{0:#x}", -0x42));
EXPECT_EQ("0", fmt::format("{0:#o}", 0));
EXPECT_EQ("042", fmt::format("{0:#o}", 042));
EXPECT_EQ("-042", fmt::format("{0:#o}", -042));
EXPECT_EQ("42", fmt::format("{0:#}", 42u));
EXPECT_EQ("0x42", fmt::format("{0:#x}", 0x42u));
EXPECT_EQ("042", fmt::format("{0:#o}", 042u));
EXPECT_EQ("-42", fmt::format("{0:#}", -42l));
EXPECT_EQ("0x42", fmt::format("{0:#x}", 0x42l));
EXPECT_EQ("-0x42", fmt::format("{0:#x}", -0x42l));
EXPECT_EQ("042", fmt::format("{0:#o}", 042l));
EXPECT_EQ("-042", fmt::format("{0:#o}", -042l));
EXPECT_EQ("42", fmt::format("{0:#}", 42ul));
EXPECT_EQ("0x42", fmt::format("{0:#x}", 0x42ul));
EXPECT_EQ("042", fmt::format("{0:#o}", 042ul));
EXPECT_EQ("-42", fmt::format("{0:#}", -42ll));
EXPECT_EQ("0x42", fmt::format("{0:#x}", 0x42ll));
EXPECT_EQ("-0x42", fmt::format("{0:#x}", -0x42ll));
EXPECT_EQ("042", fmt::format("{0:#o}", 042ll));
EXPECT_EQ("-042", fmt::format("{0:#o}", -042ll));
EXPECT_EQ("42", fmt::format("{0:#}", 42ull));
EXPECT_EQ("0x42", fmt::format("{0:#x}", 0x42ull));
EXPECT_EQ("042", fmt::format("{0:#o}", 042ull));
EXPECT_EQ("-42.0", fmt::format("{0:#}", -42.0));
EXPECT_EQ("-42.0", fmt::format("{0:#}", -42.0l));
EXPECT_EQ("4.e+01", fmt::format("{:#.0e}", 42.0));
EXPECT_EQ("0.", fmt::format("{:#.0f}", 0.01));
EXPECT_EQ("0.50", fmt::format("{:#.2g}", 0.5));
EXPECT_EQ("0.", fmt::format("{:#.0f}", 0.5));
EXPECT_THROW_MSG(fmt::format(+"{0:#", 'c'), format_error,
"missing '}' in format string");
EXPECT_THROW_MSG(fmt::format(+"{0:#}", 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG(fmt::format(+"{0:#}", "abc"), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(fmt::format(+"{0:#}", reinterpret_cast<void*>(0x42)),
format_error, "format specifier requires numeric argument");
}
TEST(format_test, zero_flag) {
EXPECT_EQ("42", fmt::format("{0:0}", 42));
EXPECT_EQ("-0042", fmt::format("{0:05}", -42));
EXPECT_EQ("00042", fmt::format("{0:05}", 42u));
EXPECT_EQ("-0042", fmt::format("{0:05}", -42l));
EXPECT_EQ("00042", fmt::format("{0:05}", 42ul));
EXPECT_EQ("-0042", fmt::format("{0:05}", -42ll));
EXPECT_EQ("00042", fmt::format("{0:05}", 42ull));
EXPECT_EQ("-000042", fmt::format("{0:07}", -42.0));
EXPECT_EQ("-000042", fmt::format("{0:07}", -42.0l));
EXPECT_THROW_MSG(fmt::format(+"{0:0", 'c'), format_error,
"missing '}' in format string");
EXPECT_THROW_MSG(fmt::format(+"{0:05}", 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG(fmt::format(+"{0:05}", "abc"), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(fmt::format(+"{0:05}", reinterpret_cast<void*>(0x42)),
format_error, "format specifier requires numeric argument");
}
TEST(format_test, width) {
char format_str[buffer_size];
safe_sprintf(format_str, "{0:%u", UINT_MAX);
increment(format_str + 3);
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
size_t size = std::strlen(format_str);
format_str[size] = '}';
format_str[size + 1] = 0;
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
safe_sprintf(format_str, "{0:%u", INT_MAX + 1u);
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
safe_sprintf(format_str, "{0:%u}", INT_MAX + 1u);
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
EXPECT_EQ(" -42", fmt::format("{0:4}", -42));
EXPECT_EQ(" 42", fmt::format("{0:5}", 42u));
EXPECT_EQ(" -42", fmt::format("{0:6}", -42l));
EXPECT_EQ(" 42", fmt::format("{0:7}", 42ul));
EXPECT_EQ(" -42", fmt::format("{0:6}", -42ll));
EXPECT_EQ(" 42", fmt::format("{0:7}", 42ull));
EXPECT_EQ(" -1.23", fmt::format("{0:8}", -1.23));
EXPECT_EQ(" -1.23", fmt::format("{0:9}", -1.23l));
EXPECT_EQ(" 0xcafe",
fmt::format("{0:10}", reinterpret_cast<void*>(0xcafe)));
EXPECT_EQ("x ", fmt::format("{0:11}", 'x'));
EXPECT_EQ("str ", fmt::format("{0:12}", "str"));
EXPECT_EQ(fmt::format("{:*^6}", "🤡"), "**🤡**");
EXPECT_EQ(fmt::format("{:*^8}", "你好"), "**你好**");
EXPECT_EQ(fmt::format("{:#6}", 42.0), " 42.0");
EXPECT_EQ(fmt::format("{:6c}", static_cast<int>('x')), "x ");
EXPECT_EQ(fmt::format("{:>06.0f}", 0.00884311), "000000");
}
TEST(format_test, runtime_width) {
char format_str[buffer_size];
safe_sprintf(format_str, "{0:{%u", UINT_MAX);
increment(format_str + 4);
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
size_t size = std::strlen(format_str);
format_str[size] = '}';
format_str[size + 1] = 0;
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
format_str[size + 1] = '}';
format_str[size + 2] = 0;
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
EXPECT_THROW_MSG(fmt::format(+"{0:{", 0), format_error,
"invalid format string");
EXPECT_THROW_MSG(fmt::format(+"{0:{}", 0), format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG(fmt::format(+"{0:{?}}", 0), format_error,
"invalid format string");
EXPECT_THROW_MSG(fmt::format(+"{0:{1}}", 0), format_error,
"argument not found");
EXPECT_THROW_MSG(fmt::format(+"{0:{0:}}", 0), format_error,
"invalid format string");
EXPECT_THROW_MSG(fmt::format(+"{0:{1}}", 0, -1), format_error,
"negative width");
EXPECT_THROW_MSG(fmt::format(+"{0:{1}}", 0, (INT_MAX + 1u)), format_error,
"number is too big");
EXPECT_THROW_MSG(fmt::format(+"{0:{1}}", 0, -1l), format_error,
"negative width");
if (fmt::detail::const_check(sizeof(long) > sizeof(int))) {
long value = INT_MAX;
EXPECT_THROW_MSG(fmt::format(+"{0:{1}}", 0, (value + 1)), format_error,
"number is too big");
}
EXPECT_THROW_MSG(fmt::format(+"{0:{1}}", 0, (INT_MAX + 1ul)), format_error,
"number is too big");
EXPECT_THROW_MSG(fmt::format(+"{0:{1}}", 0, '0'), format_error,
"width is not integer");
EXPECT_THROW_MSG(fmt::format(+"{0:{1}}", 0, 0.0), format_error,
"width is not integer");
EXPECT_EQ(" -42", fmt::format("{0:{1}}", -42, 4));
EXPECT_EQ(" 42", fmt::format("{0:{1}}", 42u, 5));
EXPECT_EQ(" -42", fmt::format("{0:{1}}", -42l, 6));
EXPECT_EQ(" 42", fmt::format("{0:{1}}", 42ul, 7));
EXPECT_EQ(" -42", fmt::format("{0:{1}}", -42ll, 6));
EXPECT_EQ(" 42", fmt::format("{0:{1}}", 42ull, 7));
EXPECT_EQ(" -1.23", fmt::format("{0:{1}}", -1.23, 8));
EXPECT_EQ(" -1.23", fmt::format("{0:{1}}", -1.23l, 9));
EXPECT_EQ(" 0xcafe",
fmt::format("{0:{1}}", reinterpret_cast<void*>(0xcafe), 10));
EXPECT_EQ("x ", fmt::format("{0:{1}}", 'x', 11));
EXPECT_EQ("str ", fmt::format("{0:{1}}", "str", 12));
}
TEST(format_test, precision) {
char format_str[buffer_size];
safe_sprintf(format_str, "{0:.%u", UINT_MAX);
increment(format_str + 4);
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
size_t size = std::strlen(format_str);
format_str[size] = '}';
format_str[size + 1] = 0;
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
safe_sprintf(format_str, "{0:.%u", INT_MAX + 1u);
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
safe_sprintf(format_str, "{0:.%u}", INT_MAX + 1u);
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
EXPECT_THROW_MSG(fmt::format(+"{0:.", 0), format_error,
"missing precision specifier");
EXPECT_THROW_MSG(fmt::format(+"{0:.}", 0), format_error,
"missing precision specifier");
EXPECT_THROW_MSG(fmt::format(+"{0:.2", 0), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.2}", 42), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.2f}", 42), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.2}", 42u), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.2f}", 42u), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.2}", 42l), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.2f}", 42l), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.2}", 42ul), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.2f}", 42ul), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.2}", 42ll), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.2f}", 42ll), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.2}", 42ull), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.2f}", 42ull), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:3.0}", 'x'), format_error,
"precision not allowed for this argument type");
EXPECT_EQ("1.2", fmt::format("{0:.2}", 1.2345));
EXPECT_EQ("1.2", fmt::format("{0:.2}", 1.2345l));
EXPECT_EQ("1.2e+56", fmt::format("{:.2}", 1.234e56));
EXPECT_EQ("1.1", fmt::format("{0:.3}", 1.1));
EXPECT_EQ("1e+00", fmt::format("{:.0e}", 1.0L));
EXPECT_EQ(" 0.0e+00", fmt::format("{:9.1e}", 0.0));
EXPECT_EQ(
fmt::format("{:.494}", 4.9406564584124654E-324),
"4.9406564584124654417656879286822137236505980261432476442558568250067550"
"727020875186529983636163599237979656469544571773092665671035593979639877"
"479601078187812630071319031140452784581716784898210368871863605699873072"
"305000638740915356498438731247339727316961514003171538539807412623856559"
"117102665855668676818703956031062493194527159149245532930545654440112748"
"012970999954193198940908041656332452475714786901472678015935523861155013"
"480352649347201937902681071074917033322268447533357208324319361e-324");
std::string outputs[] = {
"-0X1.41FE3FFE71C9E000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000P+127",
"-0XA.0FF1FFF38E4F0000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000P+124"};
EXPECT_THAT(outputs,
testing::Contains(fmt::format("{:.838A}", -2.14001164E+38)));
EXPECT_EQ("123.", fmt::format("{:#.0f}", 123.0));
EXPECT_EQ("1.23", fmt::format("{:.02f}", 1.234));
EXPECT_EQ("0.001", fmt::format("{:.1g}", 0.001));
EXPECT_EQ("1019666400", fmt::format("{}", 1019666432.0f));
EXPECT_EQ("1e+01", fmt::format("{:.0e}", 9.5));
EXPECT_EQ("1.0e-34", fmt::format("{:.1e}", 1e-34));
EXPECT_THROW_MSG(fmt::format(+"{0:.2}", reinterpret_cast<void*>(0xcafe)),
format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.2f}", reinterpret_cast<void*>(0xcafe)),
format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{:.{}e}", 42.0, fmt::detail::max_value<int>()),
format_error, "number is too big");
EXPECT_EQ("st", fmt::format("{0:.2}", "str"));
}
TEST(format_test, runtime_precision) {
char format_str[buffer_size];
safe_sprintf(format_str, "{0:.{%u", UINT_MAX);
increment(format_str + 5);
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
size_t size = std::strlen(format_str);
format_str[size] = '}';
format_str[size + 1] = 0;
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
format_str[size + 1] = '}';
format_str[size + 2] = 0;
EXPECT_THROW_MSG(fmt::format(+format_str, 0), format_error,
"number is too big");
EXPECT_THROW_MSG(fmt::format(+"{0:.{", 0), format_error,
"invalid format string");
EXPECT_THROW_MSG(fmt::format(+"{0:.{}", 0), format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG(fmt::format(+"{0:.{?}}", 0), format_error,
"invalid format string");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}", 0, 0), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 0), format_error,
"argument not found");
EXPECT_THROW_MSG(fmt::format(+"{0:.{0:}}", 0), format_error,
"invalid format string");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 0, -1), format_error,
"negative precision");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 0, (INT_MAX + 1u)), format_error,
"number is too big");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 0, -1l), format_error,
"negative precision");
if (fmt::detail::const_check(sizeof(long) > sizeof(int))) {
long value = INT_MAX;
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 0, (value + 1)), format_error,
"number is too big");
}
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 0, (INT_MAX + 1ul)), format_error,
"number is too big");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 0, '0'), format_error,
"precision is not integer");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 0, 0.0), format_error,
"precision is not integer");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 42, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}f}", 42, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 42u, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}f}", 42u, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 42l, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}f}", 42l, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 42ul, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}f}", 42ul, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 42ll, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}f}", 42ll, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", 42ull, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}f}", 42ull, 2), format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(fmt::format(+"{0:3.{1}}", 'x', 0), format_error,
"precision not allowed for this argument type");
EXPECT_EQ("1.2", fmt::format("{0:.{1}}", 1.2345, 2));
EXPECT_EQ("1.2", fmt::format("{1:.{0}}", 2, 1.2345l));
EXPECT_THROW_MSG(fmt::format(+"{0:.{1}}", reinterpret_cast<void*>(0xcafe), 2),
format_error,
"precision not allowed for this argument type");
EXPECT_THROW_MSG(
fmt::format(+"{0:.{1}f}", reinterpret_cast<void*>(0xcafe), 2),
format_error, "precision not allowed for this argument type");
EXPECT_EQ("st", fmt::format("{0:.{1}}", "str", 2));
}
TEST(format_test, format_bool) {
EXPECT_EQ("true", fmt::format("{}", true));
EXPECT_EQ("false", fmt::format("{}", false));
EXPECT_EQ("1", fmt::format("{:d}", true));
EXPECT_EQ("true ", fmt::format("{:5}", true));
EXPECT_EQ(L"true", fmt::format(L"{}", true));
EXPECT_EQ("true", fmt::format("{:s}", true));
EXPECT_EQ("false", fmt::format("{:s}", false));
EXPECT_EQ("false ", fmt::format("{:6s}", false));
}
TEST(format_test, format_short) {
short s = 42;
EXPECT_EQ("42", fmt::format("{0:d}", s));
unsigned short us = 42;
EXPECT_EQ("42", fmt::format("{0:d}", us));
}
template <typename T>
void check_unknown_types(const T& value, const char* types, const char*) {
char format_str[buffer_size];
const char* special = ".0123456789L}";
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(fmt::format(+format_str, value), format_error, message)
<< format_str << " " << message;
}
}
TEST(format_test, format_int) {
EXPECT_THROW_MSG(fmt::format(+"{0:v", 42), format_error,
"missing '}' in format string");
check_unknown_types(42, "bBdoxXnLc", "integer");
EXPECT_EQ("x", fmt::format("{:c}", static_cast<int>('x')));
}
TEST(format_test, format_bin) {
EXPECT_EQ("0", fmt::format("{0:b}", 0));
EXPECT_EQ("101010", fmt::format("{0:b}", 42));
EXPECT_EQ("101010", fmt::format("{0:b}", 42u));
EXPECT_EQ("-101010", fmt::format("{0:b}", -42));
EXPECT_EQ("11000000111001", fmt::format("{0:b}", 12345));
EXPECT_EQ("10010001101000101011001111000", fmt::format("{0:b}", 0x12345678));
EXPECT_EQ("10010000101010111100110111101111",
fmt::format("{0:b}", 0x90ABCDEF));
EXPECT_EQ("11111111111111111111111111111111",
fmt::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(format_test, format_dec) {
EXPECT_EQ("0", fmt::format("{0}", 0));
EXPECT_EQ("42", fmt::format("{0}", 42));
EXPECT_EQ("42", fmt::format("{0:d}", 42));
EXPECT_EQ("42", fmt::format("{0}", 42u));
EXPECT_EQ("-42", fmt::format("{0}", -42));
EXPECT_EQ("12345", fmt::format("{0}", 12345));
EXPECT_EQ("67890", fmt::format("{0}", 67890));
#if FMT_USE_INT128
EXPECT_EQ("0", fmt::format("{0}", static_cast<__int128_t>(0)));
EXPECT_EQ("0", fmt::format("{0}", static_cast<__uint128_t>(0)));
EXPECT_EQ("9223372036854775808",
fmt::format("{0}", static_cast<__int128_t>(INT64_MAX) + 1));
EXPECT_EQ("-9223372036854775809",
fmt::format("{0}", static_cast<__int128_t>(INT64_MIN) - 1));
EXPECT_EQ("18446744073709551616",
fmt::format("{0}", static_cast<__int128_t>(UINT64_MAX) + 1));
EXPECT_EQ("170141183460469231731687303715884105727",
fmt::format("{0}", int128_max));
EXPECT_EQ("-170141183460469231731687303715884105728",
fmt::format("{0}", int128_min));
EXPECT_EQ("340282366920938463463374607431768211455",
fmt::format("{0}", uint128_max));
#endif
char buffer[buffer_size];
safe_sprintf(buffer, "%d", INT_MIN);
EXPECT_EQ(buffer, fmt::format("{0}", INT_MIN));
safe_sprintf(buffer, "%d", INT_MAX);
EXPECT_EQ(buffer, fmt::format("{0}", INT_MAX));
safe_sprintf(buffer, "%u", UINT_MAX);
EXPECT_EQ(buffer, fmt::format("{0}", UINT_MAX));
safe_sprintf(buffer, "%ld", 0 - static_cast<unsigned long>(LONG_MIN));
EXPECT_EQ(buffer, fmt::format("{0}", LONG_MIN));
safe_sprintf(buffer, "%ld", LONG_MAX);
EXPECT_EQ(buffer, fmt::format("{0}", LONG_MAX));
safe_sprintf(buffer, "%lu", ULONG_MAX);
EXPECT_EQ(buffer, fmt::format("{0}", ULONG_MAX));
}
TEST(format_test, format_hex) {
EXPECT_EQ("0", fmt::format("{0:x}", 0));
EXPECT_EQ("42", fmt::format("{0:x}", 0x42));
EXPECT_EQ("42", fmt::format("{0:x}", 0x42u));
EXPECT_EQ("-42", fmt::format("{0:x}", -0x42));
EXPECT_EQ("12345678", fmt::format("{0:x}", 0x12345678));
EXPECT_EQ("90abcdef", fmt::format("{0:x}", 0x90abcdef));
EXPECT_EQ("12345678", fmt::format("{0:X}", 0x12345678));
EXPECT_EQ("90ABCDEF", fmt::format("{0:X}", 0x90ABCDEF));
#if FMT_USE_INT128
EXPECT_EQ("0", fmt::format("{0:x}", static_cast<__int128_t>(0)));
EXPECT_EQ("0", fmt::format("{0:x}", static_cast<__uint128_t>(0)));
EXPECT_EQ("8000000000000000",
fmt::format("{0:x}", static_cast<__int128_t>(INT64_MAX) + 1));
EXPECT_EQ("-8000000000000001",
fmt::format("{0:x}", static_cast<__int128_t>(INT64_MIN) - 1));
EXPECT_EQ("10000000000000000",
fmt::format("{0:x}", static_cast<__int128_t>(UINT64_MAX) + 1));
EXPECT_EQ("7fffffffffffffffffffffffffffffff",
fmt::format("{0:x}", int128_max));
EXPECT_EQ("-80000000000000000000000000000000",
fmt::format("{0:x}", int128_min));
EXPECT_EQ("ffffffffffffffffffffffffffffffff",
fmt::format("{0:x}", uint128_max));
#endif
char buffer[buffer_size];
safe_sprintf(buffer, "-%x", 0 - static_cast<unsigned>(INT_MIN));
EXPECT_EQ(buffer, fmt::format("{0:x}", INT_MIN));
safe_sprintf(buffer, "%x", INT_MAX);
EXPECT_EQ(buffer, fmt::format("{0:x}", INT_MAX));
safe_sprintf(buffer, "%x", UINT_MAX);
EXPECT_EQ(buffer, fmt::format("{0:x}", UINT_MAX));
safe_sprintf(buffer, "-%lx", 0 - static_cast<unsigned long>(LONG_MIN));
EXPECT_EQ(buffer, fmt::format("{0:x}", LONG_MIN));
safe_sprintf(buffer, "%lx", LONG_MAX);
EXPECT_EQ(buffer, fmt::format("{0:x}", LONG_MAX));
safe_sprintf(buffer, "%lx", ULONG_MAX);
EXPECT_EQ(buffer, fmt::format("{0:x}", ULONG_MAX));
}
TEST(format_test, format_oct) {
EXPECT_EQ("0", fmt::format("{0:o}", 0));
EXPECT_EQ("42", fmt::format("{0:o}", 042));
EXPECT_EQ("42", fmt::format("{0:o}", 042u));
EXPECT_EQ("-42", fmt::format("{0:o}", -042));
EXPECT_EQ("12345670", fmt::format("{0:o}", 012345670));
#if FMT_USE_INT128
EXPECT_EQ("0", fmt::format("{0:o}", static_cast<__int128_t>(0)));
EXPECT_EQ("0", fmt::format("{0:o}", static_cast<__uint128_t>(0)));
EXPECT_EQ("1000000000000000000000",
fmt::format("{0:o}", static_cast<__int128_t>(INT64_MAX) + 1));
EXPECT_EQ("-1000000000000000000001",
fmt::format("{0:o}", static_cast<__int128_t>(INT64_MIN) - 1));
EXPECT_EQ("2000000000000000000000",
fmt::format("{0:o}", static_cast<__int128_t>(UINT64_MAX) + 1));
EXPECT_EQ("1777777777777777777777777777777777777777777",
fmt::format("{0:o}", int128_max));
EXPECT_EQ("-2000000000000000000000000000000000000000000",
fmt::format("{0:o}", int128_min));
EXPECT_EQ("3777777777777777777777777777777777777777777",
fmt::format("{0:o}", uint128_max));
#endif
char buffer[buffer_size];
safe_sprintf(buffer, "-%o", 0 - static_cast<unsigned>(INT_MIN));
EXPECT_EQ(buffer, fmt::format("{0:o}", INT_MIN));
safe_sprintf(buffer, "%o", INT_MAX);
EXPECT_EQ(buffer, fmt::format("{0:o}", INT_MAX));
safe_sprintf(buffer, "%o", UINT_MAX);
EXPECT_EQ(buffer, fmt::format("{0:o}", UINT_MAX));
safe_sprintf(buffer, "-%lo", 0 - static_cast<unsigned long>(LONG_MIN));
EXPECT_EQ(buffer, fmt::format("{0:o}", LONG_MIN));
safe_sprintf(buffer, "%lo", LONG_MAX);
EXPECT_EQ(buffer, fmt::format("{0:o}", LONG_MAX));
safe_sprintf(buffer, "%lo", ULONG_MAX);
EXPECT_EQ(buffer, fmt::format("{0:o}", ULONG_MAX));
}
TEST(format_test, format_int_locale) {
EXPECT_EQ("1234", fmt::format("{:L}", 1234));
}
TEST(format_test, format_float) {
EXPECT_EQ("0", fmt::format("{}", 0.0f));
EXPECT_EQ("392.500000", fmt::format("{0:f}", 392.5f));
}
TEST(format_test, format_double) {
EXPECT_EQ("0", fmt::format("{}", 0.0));
check_unknown_types(1.2, "eEfFgGaAnL%", "double");
EXPECT_EQ("0", fmt::format("{:}", 0.0));
EXPECT_EQ("0.000000", fmt::format("{:f}", 0.0));
EXPECT_EQ("0", fmt::format("{:g}", 0.0));
EXPECT_EQ("392.65", fmt::format("{:}", 392.65));
EXPECT_EQ("392.65", fmt::format("{:g}", 392.65));
EXPECT_EQ("392.65", fmt::format("{:G}", 392.65));
EXPECT_EQ("4.9014e+06", fmt::format("{:g}", 4.9014e6));
EXPECT_EQ("392.650000", fmt::format("{:f}", 392.65));
EXPECT_EQ("392.650000", fmt::format("{:F}", 392.65));
EXPECT_EQ("42", fmt::format("{:L}", 42.0));
char buffer[buffer_size];
safe_sprintf(buffer, "%e", 392.65);
EXPECT_EQ(buffer, fmt::format("{0:e}", 392.65));
safe_sprintf(buffer, "%E", 392.65);
EXPECT_EQ(buffer, fmt::format("{0:E}", 392.65));
EXPECT_EQ("+0000392.6", fmt::format("{0:+010.4g}", 392.65));
safe_sprintf(buffer, "%a", -42.0);
EXPECT_EQ(buffer, fmt::format("{:a}", -42.0));
safe_sprintf(buffer, "%A", -42.0);
EXPECT_EQ(buffer, fmt::format("{:A}", -42.0));
EXPECT_EQ("9223372036854775808.000000",
fmt::format("{:f}", 9223372036854775807.0));
}
TEST(format_test, precision_rounding) {
EXPECT_EQ("0", fmt::format("{:.0f}", 0.0));
EXPECT_EQ("0", fmt::format("{:.0f}", 0.01));
EXPECT_EQ("0", fmt::format("{:.0f}", 0.1));
EXPECT_EQ("0.000", fmt::format("{:.3f}", 0.00049));
EXPECT_EQ("0.001", fmt::format("{:.3f}", 0.0005));
EXPECT_EQ("0.001", fmt::format("{:.3f}", 0.00149));
EXPECT_EQ("0.002", fmt::format("{:.3f}", 0.0015));
EXPECT_EQ("1.000", fmt::format("{:.3f}", 0.9999));
EXPECT_EQ("0.00123", fmt::format("{:.3}", 0.00123));
EXPECT_EQ("0.1", fmt::format("{:.16g}", 0.1));
EXPECT_EQ("1", fmt::format("{:.0}", 1.0));
EXPECT_EQ("225.51575035152063720",
fmt::format("{:.17f}", 225.51575035152064));
EXPECT_EQ("-761519619559038.2", fmt::format("{:.1f}", -761519619559038.2));
EXPECT_EQ("1.9156918820264798e-56",
fmt::format("{}", 1.9156918820264798e-56));
EXPECT_EQ("0.0000", fmt::format("{:.4f}", 7.2809479766055470e-15));
// Trigger a rounding error in Grisu by a specially chosen number.
EXPECT_EQ("3788512123356.985352", fmt::format("{:f}", 3788512123356.985352));
}
TEST(format_test, prettify_float) {
EXPECT_EQ("0.0001", fmt::format("{}", 1e-4));
EXPECT_EQ("1e-05", fmt::format("{}", 1e-5));
EXPECT_EQ("1000000000000000", fmt::format("{}", 1e15));
EXPECT_EQ("1e+16", fmt::format("{}", 1e16));
EXPECT_EQ("9.999e-05", fmt::format("{}", 9.999e-5));
EXPECT_EQ("10000000000", fmt::format("{}", 1e10));
EXPECT_EQ("100000000000", fmt::format("{}", 1e11));
EXPECT_EQ("12340000000", fmt::format("{}", 1234e7));
EXPECT_EQ("12.34", fmt::format("{}", 1234e-2));
EXPECT_EQ("0.001234", fmt::format("{}", 1234e-6));
EXPECT_EQ("0.1", fmt::format("{}", 0.1f));
EXPECT_EQ("0.10000000149011612", fmt::format("{}", double(0.1f)));
EXPECT_EQ("1.3563156e-19", fmt::format("{}", 1.35631564e-19f));
}
TEST(format_test, format_nan) {
double nan = std::numeric_limits<double>::quiet_NaN();
EXPECT_EQ("nan", fmt::format("{}", nan));
EXPECT_EQ("+nan", fmt::format("{:+}", nan));
if (std::signbit(-nan))
EXPECT_EQ("-nan", fmt::format("{}", -nan));
else
fmt::print("Warning: compiler doesn't handle negative NaN correctly");
EXPECT_EQ(" nan", fmt::format("{: }", nan));
EXPECT_EQ("NAN", fmt::format("{:F}", nan));
EXPECT_EQ("nan ", fmt::format("{:<7}", nan));
EXPECT_EQ(" nan ", fmt::format("{:^7}", nan));
EXPECT_EQ(" nan", fmt::format("{:>7}", nan));
}
TEST(format_test, format_infinity) {
double inf = std::numeric_limits<double>::infinity();
EXPECT_EQ("inf", fmt::format("{}", inf));
EXPECT_EQ("+inf", fmt::format("{:+}", inf));
EXPECT_EQ("-inf", fmt::format("{}", -inf));
EXPECT_EQ(" inf", fmt::format("{: }", inf));
EXPECT_EQ("INF", fmt::format("{:F}", inf));
EXPECT_EQ("inf ", fmt::format("{:<7}", inf));
EXPECT_EQ(" inf ", fmt::format("{:^7}", inf));
EXPECT_EQ(" inf", fmt::format("{:>7}", inf));
}
TEST(format_test, format_long_double) {
EXPECT_EQ("0", fmt::format("{0:}", 0.0l));
EXPECT_EQ("0.000000", fmt::format("{0:f}", 0.0l));
EXPECT_EQ("392.65", fmt::format("{0:}", 392.65l));
EXPECT_EQ("392.65", fmt::format("{0:g}", 392.65l));
EXPECT_EQ("392.65", fmt::format("{0:G}", 392.65l));
EXPECT_EQ("392.650000", fmt::format("{0:f}", 392.65l));
EXPECT_EQ("392.650000", fmt::format("{0:F}", 392.65l));
char buffer[buffer_size];
safe_sprintf(buffer, "%Le", 392.65l);
EXPECT_EQ(buffer, fmt::format("{0:e}", 392.65l));
EXPECT_EQ("+0000392.6", fmt::format("{0:+010.4g}", 392.64l));
safe_sprintf(buffer, "%La", 3.31l);
EXPECT_EQ(buffer, fmt::format("{:a}", 3.31l));
}
TEST(format_test, format_char) {
const char types[] = "cbBdoxX";
check_unknown_types('a', types, "char");
EXPECT_EQ("a", fmt::format("{0}", 'a'));
EXPECT_EQ("z", fmt::format("{0:c}", 'z'));
EXPECT_EQ(L"a", fmt::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'))
<< format_str;
}
EXPECT_EQ(fmt::format("{:02X}", n), fmt::format("{:02X}", 'x'));
}
TEST(format_test, format_volatile_char) {
volatile char c = 'x';
EXPECT_EQ("x", fmt::format("{}", c));
}
TEST(format_test, format_unsigned_char) {
EXPECT_EQ("42", fmt::format("{}", static_cast<unsigned char>(42)));
EXPECT_EQ("42", fmt::format("{}", static_cast<uint8_t>(42)));
}
TEST(format_test, format_wchar) {
EXPECT_EQ(L"a", fmt::format(L"{0}", L'a'));
// This shouldn't compile:
// format("{}", L'a');
}
TEST(format_test, format_cstring) {
check_unknown_types("test", "sp", "string");
EXPECT_EQ("test", fmt::format("{0}", "test"));
EXPECT_EQ("test", fmt::format("{0:s}", "test"));
char nonconst[] = "nonconst";
EXPECT_EQ("nonconst", fmt::format("{0}", nonconst));
EXPECT_THROW_MSG(fmt::format(+"{0}", static_cast<const char*>(nullptr)),
format_error, "string pointer is null");
}
TEST(format_test, format_schar_string) {
signed char str[] = "test";
EXPECT_EQ("test", fmt::format("{0:s}", str));
const signed char* const_str = str;
EXPECT_EQ("test", fmt::format("{0:s}", const_str));
}
TEST(format_test, format_uchar_string) {
unsigned char str[] = "test";
EXPECT_EQ("test", fmt::format("{0:s}", str));
const unsigned char* const_str = str;
EXPECT_EQ("test", fmt::format("{0:s}", const_str));
unsigned char* ptr = str;
EXPECT_EQ("test", fmt::format("{0:s}", ptr));
}
void function_pointer_test(int, double, std::string) {}
TEST(format_test, format_pointer) {
check_unknown_types(reinterpret_cast<void*>(0x1234), "p", "pointer");
EXPECT_EQ("0x0", fmt::format("{0}", static_cast<void*>(nullptr)));
EXPECT_EQ("0x1234", fmt::format("{0}", reinterpret_cast<void*>(0x1234)));
EXPECT_EQ("0x1234", fmt::format("{0:p}", reinterpret_cast<void*>(0x1234)));
EXPECT_EQ("0x" + std::string(sizeof(void*) * CHAR_BIT / 4, 'f'),
fmt::format("{0}", reinterpret_cast<void*>(~uintptr_t())));
EXPECT_EQ("0x1234",
fmt::format("{}", fmt::ptr(reinterpret_cast<int*>(0x1234))));
std::unique_ptr<int> up(new int(1));
EXPECT_EQ(fmt::format("{}", fmt::ptr(up.get())),
fmt::format("{}", fmt::ptr(up)));
std::shared_ptr<int> sp(new int(1));
EXPECT_EQ(fmt::format("{}", fmt::ptr(sp.get())),
fmt::format("{}", fmt::ptr(sp)));
EXPECT_EQ(fmt::format("{}", fmt::detail::bit_cast<const void*>(
&function_pointer_test)),
fmt::format("{}", fmt::ptr(function_pointer_test)));
EXPECT_EQ("0x0", fmt::format("{}", nullptr));
}
TEST(format_test, format_string) {
EXPECT_EQ("test", fmt::format("{0}", std::string("test")));
}
TEST(format_test, format_string_view) {
EXPECT_EQ("test", fmt::format("{}", string_view("test")));
EXPECT_EQ("", fmt::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(format_test, format_std_string_view) {
EXPECT_EQ("test", fmt::format("{}", std::string_view("test")));
EXPECT_EQ("foo", fmt::format("{}", string_viewable()));
}
struct explicitly_convertible_to_std_string_view {
explicit operator std::string_view() const { return "foo"; }
};
template <>
struct fmt::formatter<explicitly_convertible_to_std_string_view>
: formatter<std::string_view> {
auto format(explicitly_convertible_to_std_string_view v, format_context& ctx)
-> decltype(ctx.out()) {
return format_to(ctx.out(), "'{}'", std::string_view(v));
}
};
TEST(format_test, format_explicitly_convertible_to_std_string_view) {
EXPECT_EQ("'foo'",
fmt::format("{}", explicitly_convertible_to_std_string_view()));
}
#endif
// std::is_constructible is broken in MSVC until version 2015.
#if !FMT_MSC_VER || FMT_MSC_VER >= 1900
struct explicitly_convertible_to_wstring_view {
explicit operator fmt::wstring_view() const { return L"foo"; }
};
TEST(format_test, format_explicitly_convertible_to_wstring_view) {
EXPECT_EQ(L"foo",
fmt::format(L"{}", explicitly_convertible_to_wstring_view()));
}
#endif
namespace fake_qt {
class QString {
public:
QString(const wchar_t* s) : s_(s) {}
const wchar_t* utf16() const FMT_NOEXCEPT { return s_.data(); }
int size() const FMT_NOEXCEPT { return static_cast<int>(s_.size()); }
private:
std::wstring s_;
};
fmt::basic_string_view<wchar_t> to_string_view(const QString& s) FMT_NOEXCEPT {
return {s.utf16(), static_cast<size_t>(s.size())};
}
} // namespace fake_qt
TEST(format_test, format_foreign_strings) {
using fake_qt::QString;
EXPECT_EQ(fmt::format(QString(L"{}"), 42), L"42");
EXPECT_EQ(fmt::format(QString(L"{}"), QString(L"42")), L"42");
}
class Answer {};
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 != ctx.end() && *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();
}
};
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(format_test, format_custom) {
EXPECT_THROW_MSG(fmt::format(+"{:s}", date(2012, 12, 9)), format_error,
"unknown format specifier");
EXPECT_EQ("42", fmt::format("{0}", Answer()));
EXPECT_EQ("0042", fmt::format("{:04}", Answer()));
}
TEST(format_test, format_to_custom) {
char buf[10] = {};
auto end =
&*fmt::format_to(fmt::detail::make_checked(buf, 10), "{}", Answer());
EXPECT_EQ(end, buf + 2);
EXPECT_STREQ(buf, "42");
}
TEST(format_test, wide_format_string) {
EXPECT_EQ(L"42", fmt::format(L"{}", 42));
EXPECT_EQ(L"4.2", fmt::format(L"{}", 4.2));
EXPECT_EQ(L"abc", fmt::format(L"{}", L"abc"));
EXPECT_EQ(L"z", fmt::format(L"{}", L'z'));
EXPECT_THROW(fmt::format(L"{:*\x343E}", 42), fmt::format_error);
}
TEST(format_test, format_string_from_speed_test) {
EXPECT_EQ("1.2340000000:0042:+3.13:str:0x3e8:X:%",
fmt::format("{0:0.10f}:{1:04}:{2:+g}:{3}:{4}:{5}:%", 1.234, 42,
3.13, "str", reinterpret_cast<void*>(1000), 'X'));
}
TEST(format_test, format_examples) {
std::string message = fmt::format("The answer is {}", 42);
EXPECT_EQ("The answer is 42", message);
EXPECT_EQ("42", fmt::format("{}", 42));
EXPECT_EQ("42", fmt::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'");
EXPECT_EQ("First, thou shalt count to three",
fmt::format("First, thou shalt count to {0}", "three"));
EXPECT_EQ("Bring me a shrubbery", fmt::format("Bring me a {}", "shrubbery"));
EXPECT_EQ("From 1 to 3", fmt::format("From {} to {}", 1, 3));
char buffer[buffer_size];
safe_sprintf(buffer, "%03.2f", -1.2);
EXPECT_EQ(buffer, fmt::format("{:03.2f}", -1.2));
EXPECT_EQ("a, b, c", fmt::format("{0}, {1}, {2}", 'a', 'b', 'c'));
EXPECT_EQ("a, b, c", fmt::format("{}, {}, {}", 'a', 'b', 'c'));
EXPECT_EQ("c, b, a", fmt::format("{2}, {1}, {0}", 'a', 'b', 'c'));
EXPECT_EQ("abracadabra", fmt::format("{0}{1}{0}", "abra", "cad"));
EXPECT_EQ("left aligned ",
fmt::format("{:<30}", "left aligned"));
EXPECT_EQ(" right aligned",
fmt::format("{:>30}", "right aligned"));
EXPECT_EQ(" centered ",
fmt::format("{:^30}", "centered"));
EXPECT_EQ("***********centered***********",
fmt::format("{:*^30}", "centered"));
EXPECT_EQ("+3.140000; -3.140000", fmt::format("{:+f}; {:+f}", 3.14, -3.14));
EXPECT_EQ(" 3.140000; -3.140000", fmt::format("{: f}; {: f}", 3.14, -3.14));
EXPECT_EQ("3.140000; -3.140000", fmt::format("{:-f}; {:-f}", 3.14, -3.14));
EXPECT_EQ("int: 42; hex: 2a; oct: 52",
fmt::format("int: {0:d}; hex: {0:x}; oct: {0:o}", 42));
EXPECT_EQ("int: 42; hex: 0x2a; oct: 052",
fmt::format("int: {0:d}; hex: {0:#x}; oct: {0:#o}", 42));
EXPECT_EQ("The answer is 42", fmt::format("The answer is {}", 42));
EXPECT_THROW_MSG(fmt::format(+"The answer is {:d}", "forty-two"),
format_error, "invalid type specifier");
EXPECT_EQ(L"Cyrillic letter \x42e",
fmt::format(L"Cyrillic letter {}", L'\x42e'));
EXPECT_WRITE(
stdout, fmt::print("{}", std::numeric_limits<double>::infinity()), "inf");
}
TEST(format_test, print) {
EXPECT_WRITE(stdout, fmt::print("Don't {}!", "panic"), "Don't panic!");
EXPECT_WRITE(stderr, fmt::print(stderr, "Don't {}!", "panic"),
"Don't panic!");
// Check that the wide print overload compiles.
if (fmt::detail::const_check(false)) fmt::print(L"test");
}
TEST(format_test, variadic) {
EXPECT_EQ("abc1", fmt::format("{}c{}", "ab", 1));
EXPECT_EQ(L"abc1", fmt::format(L"{}c{}", L"ab", 1));
}
TEST(format_test, dynamic) {
using ctx = fmt::format_context;
auto args = std::vector<fmt::basic_format_arg<ctx>>();
args.emplace_back(fmt::detail::make_arg<ctx>(42));
args.emplace_back(fmt::detail::make_arg<ctx>("abc1"));
args.emplace_back(fmt::detail::make_arg<ctx>(1.5f));
std::string result = fmt::vformat(
"{} and {} and {}",
fmt::format_args(args.data(), static_cast<int>(args.size())));
EXPECT_EQ("42 and abc1 and 1.5", result);
}
TEST(format_test, bytes) {
auto s = fmt::format("{:10}", fmt::bytes("ёжик"));
EXPECT_EQ("ёжик ", s);
EXPECT_EQ(10, s.size());
}
enum test_enum { foo, bar };
TEST(format_test, join) {
using fmt::join;
int v1[3] = {1, 2, 3};
auto v2 = std::vector<float>();
v2.push_back(1.2f);
v2.push_back(3.4f);
void* v3[2] = {&v1[0], &v1[1]};
EXPECT_EQ("(1, 2, 3)", fmt::format("({})", join(v1, v1 + 3, ", ")));
EXPECT_EQ("(1)", fmt::format("({})", join(v1, v1 + 1, ", ")));
EXPECT_EQ("()", fmt::format("({})", join(v1, v1, ", ")));
EXPECT_EQ("(001, 002, 003)", fmt::format("({:03})", join(v1, v1 + 3, ", ")));
EXPECT_EQ("(+01.20, +03.40)",
fmt::format("({:+06.2f})", join(v2.begin(), v2.end(), ", ")));
EXPECT_EQ(L"(1, 2, 3)", fmt::format(L"({})", join(v1, v1 + 3, L", ")));
EXPECT_EQ("1, 2, 3", fmt::format("{0:{1}}", join(v1, v1 + 3, ", "), 1));
EXPECT_EQ(fmt::format("{}, {}", v3[0], v3[1]),
fmt::format("{}", join(v3, v3 + 2, ", ")));
EXPECT_EQ("(1, 2, 3)", fmt::format("({})", join(v1, ", ")));
EXPECT_EQ("(+01.20, +03.40)", fmt::format("({:+06.2f})", join(v2, ", ")));
auto v4 = std::vector<test_enum>{foo, bar, foo};
EXPECT_EQ("0 1 0", fmt::format("{}", join(v4, " ")));
}
#ifdef __cpp_lib_byte
TEST(format_test, join_bytes) {
auto v = std::vector<std::byte>{std::byte(1), std::byte(2), std::byte(3)};
EXPECT_EQ("1, 2, 3", fmt::format("{}", fmt::join(v, ", ")));
}
#endif
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(format_test, format_message_example) {
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(format_test, unpacked_args) {
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"; }
constexpr char with_null[3] = {'{', '}', '\0'};
constexpr char no_null[2] = {'{', '}'};
static FMT_CONSTEXPR_DECL const char static_with_null[3] = {'{', '}', '\0'};
static FMT_CONSTEXPR_DECL const wchar_t static_with_null_wide[3] = {'{', '}',
'\0'};
static FMT_CONSTEXPR_DECL const char static_no_null[2] = {'{', '}'};
static FMT_CONSTEXPR_DECL const wchar_t static_no_null_wide[2] = {'{', '}'};
TEST(format_test, compile_time_string) {
EXPECT_EQ("foo", fmt::format(FMT_STRING("foo")));
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()));
#if FMT_USE_NONTYPE_TEMPLATE_PARAMETERS
using namespace fmt::literals;
EXPECT_EQ("foobar", fmt::format(FMT_STRING("{foo}{bar}"), "bar"_a = "bar",
"foo"_a = "foo"));
EXPECT_EQ("", fmt::format(FMT_STRING("")));
EXPECT_EQ("", fmt::format(FMT_STRING(""), "arg"_a = 42));
#endif
(void)static_with_null;
(void)static_with_null_wide;
(void)static_no_null;
(void)static_no_null_wide;
#ifndef _MSC_VER
EXPECT_EQ("42", fmt::format(FMT_STRING(static_with_null), 42));
EXPECT_EQ(L"42", fmt::format(FMT_STRING(static_with_null_wide), 42));
EXPECT_EQ("42", fmt::format(FMT_STRING(static_no_null), 42));
EXPECT_EQ(L"42", fmt::format(FMT_STRING(static_no_null_wide), 42));
#endif
(void)with_null;
(void)no_null;
#if __cplusplus >= 201703L
EXPECT_EQ("42", fmt::format(FMT_STRING(with_null), 42));
EXPECT_EQ("42", fmt::format(FMT_STRING(no_null), 42));
#endif
#if defined(FMT_USE_STRING_VIEW) && __cplusplus >= 201703L
EXPECT_EQ("42", fmt::format(FMT_STRING(std::string_view("{}")), 42));
EXPECT_EQ(L"42", fmt::format(FMT_STRING(std::wstring_view(L"{}")), 42));
#endif
}
TEST(format_test, custom_format_compile_time_string) {
EXPECT_EQ("42", fmt::format(FMT_STRING("{}"), Answer()));
auto answer = Answer();
EXPECT_EQ("42", fmt::format(FMT_STRING("{}"), answer));
char buf[10] = {};
fmt::format_to(buf, FMT_STRING("{}"), answer);
const Answer const_answer = 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(format_test, format_udl) {
auto udl_format = "{}c{}"_format("ab", 1);
EXPECT_EQ(fmt::format("{}c{}", "ab", 1), udl_format);
auto udl_format_w = L"{}c{}"_format(L"ab", 1);
EXPECT_EQ(fmt::format(L"{}c{}", L"ab", 1), udl_format_w);
}
TEST(format_test, named_arg_udl) {
auto udl_a = fmt::format("{first}{second}{first}{third}", "first"_a = "abra",
"second"_a = "cad", "third"_a = 99);
EXPECT_EQ(
fmt::format("{first}{second}{first}{third}", fmt::arg("first", "abra"),
fmt::arg("second", "cad"), fmt::arg("third", 99)),
udl_a);
auto udl_a_w =
fmt::format(L"{first}{second}{first}{third}", L"first"_a = L"abra",
L"second"_a = L"cad", L"third"_a = 99);
EXPECT_EQ(
fmt::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(format_test, udl_template) {
EXPECT_EQ("foo", "foo"_format());
EXPECT_EQ(" 42", "{0:10}"_format(42));
}
TEST(format_test, udl_pass_user_defined_object_as_lvalue) {
EXPECT_EQ("2015-10-21", "{}"_format(date(2015, 10, 21)));
}
#endif // FMT_USE_USER_DEFINED_LITERALS
TEST(format_test, enum) { EXPECT_EQ("0", fmt::format("{}", foo)); }
TEST(format_test, formatter_not_specialized) {
static_assert(!fmt::has_formatter<fmt::formatter<test_enum>,
fmt::format_context>::value,
"");
}
#if FMT_HAS_FEATURE(cxx_strong_enums)
enum big_enum : unsigned long long { big_enum_value = 5000000000ULL };
TEST(format_test, strong_enum) {
EXPECT_EQ("5000000000", fmt::format("{}", big_enum_value));
}
#endif
TEST(format_test, non_null_terminated_format_string) {
EXPECT_EQ("42", fmt::format(string_view("{}foo", 2), 42));
}
struct variant {
enum { int_type, string_type } type;
explicit variant(int) : type(int_type) {}
explicit variant(const char*) : type(string_type) {}
};
FMT_BEGIN_NAMESPACE
template <> struct formatter<variant> : dynamic_formatter<> {
auto format(variant value, format_context& ctx) -> decltype(ctx.out()) {
if (value.type == variant::int_type)
return dynamic_formatter<>::format(42, ctx);
return dynamic_formatter<>::format("foo", ctx);
}
};
FMT_END_NAMESPACE
TEST(format_test, dynamic_formatter) {
auto num = variant(42);
auto str = variant("foo");
EXPECT_EQ("42", fmt::format("{:d}", num));
EXPECT_EQ("foo", fmt::format("{:s}", str));
EXPECT_EQ(" 42 foo ", fmt::format("{:{}} {:{}}", num, 3, str, 4));
EXPECT_THROW_MSG(fmt::format(+"{0:{}}", num), format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG(fmt::format(+"{:{0}}", num), format_error,
"cannot switch from automatic to manual argument indexing");
EXPECT_THROW_MSG(fmt::format(+"{:+}", str), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(fmt::format(+"{:-}", str), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(fmt::format(+"{: }", str), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(fmt::format(+"{:#}", str), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(fmt::format(+"{:0}", str), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(fmt::format(+"{:.2}", num), format_error,
"precision not allowed for this argument type");
}
namespace adl_test {
namespace fmt {
namespace detail {
struct foo {};
template <typename, typename OutputIt> void write(OutputIt, foo) = delete;
} // namespace detail
} // namespace fmt
} // namespace adl_test
FMT_BEGIN_NAMESPACE
template <>
struct formatter<adl_test::fmt::detail::foo> : formatter<std::string> {
template <typename FormatContext>
auto format(adl_test::fmt::detail::foo, FormatContext& ctx)
-> decltype(ctx.out()) {
return formatter<std::string>::format("foo", ctx);
}
};
FMT_END_NAMESPACE
TEST(format_test, to_string) {
EXPECT_EQ("42", fmt::to_string(42));
EXPECT_EQ("0x1234", fmt::to_string(reinterpret_cast<void*>(0x1234)));
EXPECT_EQ("foo", fmt::to_string(adl_test::fmt::detail::foo()));
enum test_enum2 : unsigned char { test_value };
EXPECT_EQ("0", fmt::to_string(test_value));
}
TEST(format_test, to_wstring) { EXPECT_EQ(L"42", fmt::to_wstring(42)); }
TEST(format_test, output_iterators) {
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(format_test, formatted_size) {
EXPECT_EQ(2u, fmt::formatted_size("{}", 42));
}
TEST(format_test, format_to_no_args) {
std::string s;
fmt::format_to(std::back_inserter(s), "test");
EXPECT_EQ("test", s);
}
TEST(format_test, format_to) {
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(format_test, format_to_wide) {
std::vector<wchar_t> buf;
fmt::format_to(std::back_inserter(buf), L"{}{}", 42, L'\0');
EXPECT_STREQ(buf.data(), L"42");
}
TEST(format_test, format_to_memory_buffer) {
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(format_test, format_to_vector) {
std::vector<char> v;
fmt::format_to(std::back_inserter(v), "{}", "foo");
EXPECT_EQ(string_view(v.data(), v.size()), "foo");
}
struct nongrowing_container {
using value_type = char;
void push_back(char) { throw std::runtime_error("can't take it any more"); }
};
TEST(format_test, format_to_propagates_exceptions) {
auto c = nongrowing_container();
EXPECT_THROW(fmt::format_to(std::back_inserter(c), "{}", 42),
std::runtime_error);
}
TEST(format_test, format_to_n) {
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));
result = fmt::format_to_n(buffer, 4, "{}", "ABCDE");
EXPECT_EQ(5u, result.size);
EXPECT_EQ("ABCD", fmt::string_view(buffer, 4));
buffer[3] = 'x';
result = fmt::format_to_n(buffer, 3, "{}", std::string(1000, '*'));
EXPECT_EQ(1000u, result.size);
EXPECT_EQ("***x", fmt::string_view(buffer, 4));
}
TEST(format_test, wide_format_to_n) {
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));
}
struct test_output_iterator {
char* data;
using iterator_category = std::output_iterator_tag;
using value_type = void;
using difference_type = void;
using pointer = void;
using reference = void;
test_output_iterator& operator++() {
++data;
return *this;
}
test_output_iterator operator++(int) {
auto tmp = *this;
++data;
return tmp;
}
char& operator*() { return *data; }
};
TEST(format_test, format_to_n_output_iterator) {
char buf[10] = {};
fmt::format_to_n(test_output_iterator{buf}, 10, "{}", 42);
EXPECT_STREQ(buf, "42");
}
#if FMT_USE_CONSTEXPR
enum class arg_id_result { none, empty, index, name, error };
struct test_arg_id_handler {
arg_id_result res = arg_id_result::none;
int index = 0;
string_view name;
FMT_CONSTEXPR void operator()() { res = arg_id_result::empty; }
FMT_CONSTEXPR void operator()(int i) {
res = arg_id_result::index;
index = i;
}
FMT_CONSTEXPR void operator()(string_view n) {
res = arg_id_result::name;
name = n;
}
FMT_CONSTEXPR void on_error(const char*) { res = arg_id_result::error; }
};
template <size_t N>
FMT_CONSTEXPR test_arg_id_handler parse_arg_id(const char (&s)[N]) {
test_arg_id_handler h;
fmt::detail::parse_arg_id(s, s + N, h);
return h;
}
TEST(format_test, constexpr_parse_arg_id) {
static_assert(parse_arg_id(":").res == arg_id_result::empty, "");
static_assert(parse_arg_id("}").res == arg_id_result::empty, "");
static_assert(parse_arg_id("42:").res == arg_id_result::index, "");
static_assert(parse_arg_id("42:").index == 42, "");
static_assert(parse_arg_id("foo:").res == arg_id_result::name, "");
static_assert(parse_arg_id("foo:").name.size() == 3, "");
static_assert(parse_arg_id("!").res == arg_id_result::error, "");
}
struct test_format_specs_handler {
enum result { none, plus, minus, space, hash, zero, loc, error };
result res = none;
fmt::align_t alignment = fmt::align::none;
char fill = 0;
int width = 0;
fmt::detail::arg_ref<char> width_ref;
int precision = 0;
fmt::detail::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),
alignment(other.alignment),
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) { alignment = a; }
FMT_CONSTEXPR void on_fill(fmt::string_view f) { fill = f[0]; }
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_localized() { res = loc; }
FMT_CONSTEXPR void on_width(int w) { width = w; }
FMT_CONSTEXPR void on_dynamic_width(fmt::detail::auto_id) {}
FMT_CONSTEXPR void on_dynamic_width(int index) { width_ref = index; }
FMT_CONSTEXPR void on_dynamic_width(string_view) {}
FMT_CONSTEXPR void on_precision(int p) { precision = p; }
FMT_CONSTEXPR void on_dynamic_precision(fmt::detail::auto_id) {}
FMT_CONSTEXPR void on_dynamic_precision(int 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]) {
auto h = test_format_specs_handler();
fmt::detail::parse_format_specs(s, s + N, h);
return h;
}
TEST(format_test, constexpr_parse_format_specs) {
using handler = test_format_specs_handler;
static_assert(parse_test_specs("<").alignment == 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("L").res == handler::loc, "");
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 int 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 {
using char_type = char;
using format_arg = fmt::basic_format_arg<test_context>;
using parse_context_type = fmt::format_parse_context;
template <typename T> struct formatter_type {
using type = fmt::formatter<T, char_type>;
};
template <typename Id>
FMT_CONSTEXPR fmt::basic_format_arg<test_context> arg(Id id) {
return fmt::detail::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]) {
auto specs = fmt::format_specs();
auto parse_ctx = test_parse_context();
auto ctx = test_context();
fmt::detail::specs_handler<test_parse_context, test_context> h(
specs, parse_ctx, ctx);
parse_format_specs(s, s + N, h);
return specs;
}
TEST(format_test, constexpr_specs_handler) {
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::detail::dynamic_format_specs<char> parse_dynamic_specs(
const char (&s)[N]) {
auto specs = fmt::detail::dynamic_format_specs<char>();
auto ctx = test_parse_context();
auto h = fmt::detail::dynamic_specs_handler<test_parse_context>(specs, ctx);
parse_format_specs(s, s + N, h);
return specs;
}
TEST(format_test, constexpr_dynamic_specs_handler) {
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::detail::specs_checker<test_format_specs_handler> checker(
test_format_specs_handler(), fmt::detail::type::double_type);
parse_format_specs(s, s + N, checker);
return checker;
}
TEST(format_test, constexpr_specs_checker) {
using handler = test_format_specs_handler;
static_assert(check_specs("<").alignment == 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 int on_arg_id() { return 0; }
template <typename T> FMT_CONSTEXPR int on_arg_id(T) { return 0; }
FMT_CONSTEXPR void on_replacement_field(int, const char*) {}
FMT_CONSTEXPR const char* on_format_specs(int, const char* begin,
const char*) {
return begin;
}
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]) {
auto h = test_format_string_handler();
fmt::detail::parse_format_string<true>(fmt::string_view(s, N - 1), h);
return !h.error;
}
TEST(format_test, constexpr_parse_format_string) {
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;
auto s = string_view(fmt, len(fmt));
auto checker =
fmt::detail::format_string_checker<char, test_error_handler, Args...>(
s, test_error_handler(actual_error));
fmt::detail::parse_format_string<true>(s, checker);
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(format_test, format_string_errors) {
EXPECT_ERROR_NOARGS("foo", nullptr);
EXPECT_ERROR_NOARGS("}", "unmatched '}' in format string");
EXPECT_ERROR("{0:s", "unknown format specifier", date);
# if !FMT_MSC_VER || FMT_MSC_VER >= 1916
// This causes an detail 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 not found");
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("{:{}}", "argument not found", int);
EXPECT_ERROR("{:.{}}", "argument not found", double);
EXPECT_ERROR("{:.2}", "precision not allowed for this argument type", int);
EXPECT_ERROR("{:s}", "invalid type specifier", int);
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
# if FMT_USE_NONTYPE_TEMPLATE_PARAMETERS
EXPECT_ERROR("{foo}", "named argument is not found", decltype("bar"_a = 42));
EXPECT_ERROR("{foo}", "named argument is not found",
decltype(fmt::arg("foo", 42)));
# else
EXPECT_ERROR("{foo}",
"compile-time checks for named arguments require C++20 support",
int);
# endif
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 not found");
EXPECT_ERROR("{1}", "argument not found", 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);
}
TEST(format_test, vformat_to) {
using context = fmt::format_context;
fmt::basic_format_arg<context> arg = fmt::detail::make_arg<context>(42);
auto args = fmt::basic_format_args<context>(&arg, 1);
auto s = std::string();
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);
using wcontext = fmt::wformat_context;
fmt::basic_format_arg<wcontext> warg = fmt::detail::make_arg<wcontext>(42);
auto wargs = fmt::basic_format_args<wcontext>(&warg, 1);
auto w = std::wstring();
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 fmt_to_string(const T& t) {
return fmt::format(FMT_STRING("{}"), t);
}
TEST(format_test, fmt_string_in_template) {
EXPECT_EQ(fmt_to_string(1), "1");
EXPECT_EQ(fmt_to_string(0), "0");
}
#endif // FMT_USE_CONSTEXPR
TEST(format_test, char_traits_is_not_ambiguous) {
// Test that we don't inject detail names into the std namespace.
using namespace std;
auto c = char_traits<char>::char_type();
(void)c;
#if __cplusplus >= 201103L
auto s = std::string();
auto lval = begin(s);
(void)lval;
#endif
}
#if __cplusplus > 201103L
struct custom_char {
int value;
custom_char() = default;
template <typename T>
constexpr custom_char(T val) : value(static_cast<int>(val)) {}
operator int() const { return value; }
};
int to_ascii(custom_char c) { return c; }
FMT_BEGIN_NAMESPACE
template <> struct is_char<custom_char> : std::true_type {};
FMT_END_NAMESPACE
TEST(format_test, format_custom_char) {
const custom_char format[] = {'{', '}', 0};
auto result = fmt::format(format, custom_char('x'));
EXPECT_EQ(result.size(), 1);
EXPECT_EQ(result[0], custom_char('x'));
}
#endif
// Convert a char8_t string to std::string. Otherwise GTest will insist on
// inserting `char8_t` NTBS into a `char` stream which is disabled by P1423.
template <typename S> std::string from_u8str(const S& str) {
return std::string(str.begin(), str.end());
}
TEST(format_test, format_utf8_precision) {
using str_type = std::basic_string<fmt::detail::char8_type>;
auto format =
str_type(reinterpret_cast<const fmt::detail::char8_type*>(u8"{:.4}"));
auto str = str_type(reinterpret_cast<const fmt::detail::char8_type*>(
u8"caf\u00e9s")); // cafés
auto result = fmt::format(format, str);
EXPECT_EQ(fmt::detail::compute_width(result), 4);
EXPECT_EQ(result.size(), 5);
EXPECT_EQ(from_u8str(result), from_u8str(str.substr(0, 5)));
}
struct check_back_appender {};
FMT_BEGIN_NAMESPACE
template <> struct formatter<check_back_appender> {
auto parse(format_parse_context& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
template <typename Context>
auto format(check_back_appender, Context& ctx) -> decltype(ctx.out()) {
auto out = ctx.out();
static_assert(std::is_same<decltype(++out), decltype(out)&>::value,
"needs to satisfy weakly_incrementable");
*out = 'y';
return ++out;
}
};
FMT_END_NAMESPACE
TEST(format_test, back_insert_slicing) {
EXPECT_EQ(fmt::format("{}", check_back_appender{}), "y");
}
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(format_test, test_formatters_enabled) {
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>();
}
TEST(format_int_test, data) {
fmt::format_int format_int(42);
EXPECT_EQ("42", std::string(format_int.data(), format_int.size()));
}
TEST(format_int_test, format_int) {
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());
}
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