fmt/test/core-test.cc

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// Formatting library for C++ - core tests
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//
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.
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// clang-format off
#include "test-assert.h"
// clang-format on
#include "fmt/core.h"
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#include <algorithm> // std::copy_n
#include <climits> // INT_MAX
#include <cstring> // std::strlen
#include <functional> // std::equal_to
#include <iterator> // std::back_insert_iterator
#include <limits> // std::numeric_limits
#include <string> // std::string
#include <type_traits> // std::is_same
#include "gmock.h"
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#if defined(FMT_COMPILE_TIME_CHECKS) && FMT_COMPILE_TIME_CHECKS
# include "fmt/format.h"
#endif
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using fmt::string_view;
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using fmt::detail::buffer;
using testing::_;
using testing::Invoke;
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using testing::Return;
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TEST(string_view_test, value_type) {
static_assert(std::is_same<string_view::value_type, char>::value, "");
}
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TEST(string_view_test, length) {
// Test that string_view::size() returns string length, not buffer size.
char str[100] = "some string";
EXPECT_EQ(std::strlen(str), string_view(str).size());
EXPECT_LT(std::strlen(str), sizeof(str));
}
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// Check string_view's comparison operator.
template <template <typename> class Op> void check_op() {
const char* inputs[] = {"foo", "fop", "fo"};
size_t num_inputs = sizeof(inputs) / sizeof(*inputs);
for (size_t i = 0; i < num_inputs; ++i) {
for (size_t j = 0; j < num_inputs; ++j) {
string_view lhs(inputs[i]), rhs(inputs[j]);
EXPECT_EQ(Op<int>()(lhs.compare(rhs), 0), Op<string_view>()(lhs, rhs));
}
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}
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}
TEST(string_view_test, compare) {
EXPECT_EQ(string_view("foo").compare(string_view("foo")), 0);
EXPECT_GT(string_view("fop").compare(string_view("foo")), 0);
EXPECT_LT(string_view("foo").compare(string_view("fop")), 0);
EXPECT_GT(string_view("foo").compare(string_view("fo")), 0);
EXPECT_LT(string_view("fo").compare(string_view("foo")), 0);
check_op<std::equal_to>();
check_op<std::not_equal_to>();
check_op<std::less>();
check_op<std::less_equal>();
check_op<std::greater>();
check_op<std::greater_equal>();
}
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namespace test_ns {
template <typename Char> class test_string {
private:
std::basic_string<Char> s_;
public:
test_string(const Char* s) : s_(s) {}
const Char* data() const { return s_.data(); }
size_t length() const { return s_.size(); }
operator const Char*() const { return s_.c_str(); }
};
template <typename Char>
fmt::basic_string_view<Char> to_string_view(const test_string<Char>& s) {
return {s.data(), s.length()};
}
struct non_string {};
} // namespace test_ns
template <typename T> class is_string_test : public testing::Test {};
using string_char_types = testing::Types<char, wchar_t, char16_t, char32_t>;
TYPED_TEST_SUITE(is_string_test, string_char_types);
template <typename Char>
struct derived_from_string_view : fmt::basic_string_view<Char> {};
TYPED_TEST(is_string_test, is_string) {
EXPECT_TRUE(fmt::detail::is_string<TypeParam*>::value);
EXPECT_TRUE(fmt::detail::is_string<const TypeParam*>::value);
EXPECT_TRUE(fmt::detail::is_string<TypeParam[2]>::value);
EXPECT_TRUE(fmt::detail::is_string<const TypeParam[2]>::value);
EXPECT_TRUE(fmt::detail::is_string<std::basic_string<TypeParam>>::value);
EXPECT_TRUE(fmt::detail::is_string<fmt::basic_string_view<TypeParam>>::value);
EXPECT_TRUE(
fmt::detail::is_string<derived_from_string_view<TypeParam>>::value);
using fmt_string_view = fmt::detail::std_string_view<TypeParam>;
EXPECT_TRUE(std::is_empty<fmt_string_view>::value !=
fmt::detail::is_string<fmt_string_view>::value);
EXPECT_TRUE(fmt::detail::is_string<test_ns::test_string<TypeParam>>::value);
EXPECT_FALSE(fmt::detail::is_string<test_ns::non_string>::value);
}
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#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 470
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TEST(buffer_test, noncopyable) {
EXPECT_FALSE(std::is_copy_constructible<buffer<char>>::value);
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# if !FMT_MSC_VER
// std::is_copy_assignable is broken in MSVC2013.
EXPECT_FALSE(std::is_copy_assignable<buffer<char>>::value);
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# endif
}
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TEST(buffer_test, nonmoveable) {
EXPECT_FALSE(std::is_move_constructible<buffer<char>>::value);
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# if !FMT_MSC_VER
// std::is_move_assignable is broken in MSVC2013.
EXPECT_FALSE(std::is_move_assignable<buffer<char>>::value);
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# endif
}
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#endif
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TEST(buffer_test, indestructible) {
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static_assert(!std::is_destructible<fmt::detail::buffer<int>>(),
"buffer's destructor is protected");
}
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template <typename T> struct mock_buffer final : buffer<T> {
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MOCK_METHOD1(do_grow, size_t(size_t capacity));
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void grow(size_t capacity) { this->set(this->data(), do_grow(capacity)); }
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mock_buffer(T* data = nullptr, size_t buf_capacity = 0) {
this->set(data, buf_capacity);
ON_CALL(*this, do_grow(_)).WillByDefault(Invoke([](size_t capacity) {
return capacity;
}));
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}
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};
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TEST(buffer_test, ctor) {
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{
mock_buffer<int> buffer;
EXPECT_EQ(nullptr, buffer.data());
EXPECT_EQ(static_cast<size_t>(0), buffer.size());
EXPECT_EQ(static_cast<size_t>(0), buffer.capacity());
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}
{
int dummy;
mock_buffer<int> buffer(&dummy);
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EXPECT_EQ(&dummy, &buffer[0]);
EXPECT_EQ(static_cast<size_t>(0), buffer.size());
EXPECT_EQ(static_cast<size_t>(0), buffer.capacity());
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}
{
int dummy;
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size_t capacity = std::numeric_limits<size_t>::max();
mock_buffer<int> buffer(&dummy, capacity);
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EXPECT_EQ(&dummy, &buffer[0]);
EXPECT_EQ(static_cast<size_t>(0), buffer.size());
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EXPECT_EQ(capacity, buffer.capacity());
}
}
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TEST(buffer_test, access) {
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char data[10];
mock_buffer<char> buffer(data, sizeof(data));
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buffer[0] = 11;
EXPECT_EQ(11, buffer[0]);
buffer[3] = 42;
EXPECT_EQ(42, *(&buffer[0] + 3));
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const fmt::detail::buffer<char>& const_buffer = buffer;
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EXPECT_EQ(42, const_buffer[3]);
}
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TEST(buffer_test, try_resize) {
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char data[123];
mock_buffer<char> buffer(data, sizeof(data));
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buffer[10] = 42;
EXPECT_EQ(42, buffer[10]);
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buffer.try_resize(20);
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EXPECT_EQ(20u, buffer.size());
EXPECT_EQ(123u, buffer.capacity());
EXPECT_EQ(42, buffer[10]);
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buffer.try_resize(5);
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EXPECT_EQ(5u, buffer.size());
EXPECT_EQ(123u, buffer.capacity());
EXPECT_EQ(42, buffer[10]);
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// Check if try_resize calls grow.
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EXPECT_CALL(buffer, do_grow(124));
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buffer.try_resize(124);
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EXPECT_CALL(buffer, do_grow(200));
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buffer.try_resize(200);
}
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TEST(buffer_test, try_resize_partial) {
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char data[10];
mock_buffer<char> buffer(data, sizeof(data));
EXPECT_CALL(buffer, do_grow(20)).WillOnce(Return(15));
buffer.try_resize(20);
EXPECT_EQ(buffer.capacity(), 15);
EXPECT_EQ(buffer.size(), 15);
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}
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TEST(buffer_test, clear) {
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mock_buffer<char> buffer;
EXPECT_CALL(buffer, do_grow(20));
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buffer.try_resize(20);
buffer.try_resize(0);
EXPECT_EQ(static_cast<size_t>(0), buffer.size());
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EXPECT_EQ(20u, buffer.capacity());
}
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TEST(buffer_test, append) {
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char data[15];
mock_buffer<char> buffer(data, 10);
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auto test = "test";
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buffer.append(test, test + 5);
EXPECT_STREQ(test, &buffer[0]);
EXPECT_EQ(5u, buffer.size());
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buffer.try_resize(10);
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EXPECT_CALL(buffer, do_grow(12));
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buffer.append(test, test + 2);
EXPECT_EQ('t', buffer[10]);
EXPECT_EQ('e', buffer[11]);
EXPECT_EQ(12u, buffer.size());
}
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TEST(buffer_test, append_partial) {
char data[10];
mock_buffer<char> buffer(data, sizeof(data));
testing::InSequence seq;
EXPECT_CALL(buffer, do_grow(15)).WillOnce(Return(10));
EXPECT_CALL(buffer, do_grow(15)).WillOnce(Invoke([&buffer](size_t) {
EXPECT_EQ(fmt::string_view(buffer.data(), buffer.size()), "0123456789");
buffer.clear();
return 10;
}));
auto test = "0123456789abcde";
buffer.append(test, test + 15);
}
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TEST(buffer_test, append_allocates_enough_storage) {
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char data[19];
mock_buffer<char> buffer(data, 10);
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auto test = "abcdefgh";
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buffer.try_resize(10);
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EXPECT_CALL(buffer, do_grow(19));
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buffer.append(test, test + 9);
}
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struct custom_context {
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using char_type = char;
using parse_context_type = fmt::format_parse_context;
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bool called = false;
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template <typename T> struct formatter_type {
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auto parse(fmt::format_parse_context& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
const char* format(const T&, custom_context& ctx) {
ctx.called = true;
return nullptr;
}
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};
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void advance_to(const char*) {}
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};
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struct test_struct {};
FMT_BEGIN_NAMESPACE
template <typename Char> struct formatter<test_struct, Char> {
auto parse(format_parse_context& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
auto format(test_struct, format_context& ctx) -> decltype(ctx.out()) {
auto test = string_view("test");
return std::copy_n(test.data(), test.size(), ctx.out());
}
};
FMT_END_NAMESPACE
TEST(arg_test, format_args) {
auto args = fmt::format_args();
EXPECT_FALSE(args.get(1));
}
TEST(arg_test, make_value_with_custom_context) {
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auto t = test_struct();
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fmt::detail::value<custom_context> arg(
fmt::detail::arg_mapper<custom_context>().map(t));
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auto ctx = custom_context();
auto parse_ctx = fmt::format_parse_context("");
arg.custom.format(&t, parse_ctx, ctx);
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EXPECT_TRUE(ctx.called);
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}
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// Use a unique result type to make sure that there are no undesirable
// conversions.
struct test_result {};
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template <typename T> struct mock_visitor {
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template <typename U> struct result { using type = test_result; };
mock_visitor() {
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ON_CALL(*this, visit(_)).WillByDefault(Return(test_result()));
}
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MOCK_METHOD1_T(visit, test_result(T value));
MOCK_METHOD0_T(unexpected, void());
test_result operator()(T value) { return visit(value); }
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template <typename U> test_result operator()(U) {
unexpected();
return test_result();
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}
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};
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template <typename T> struct visit_type { using type = T; };
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#define VISIT_TYPE(type_, visit_type_) \
template <> struct visit_type<type_> { using type = visit_type_; }
VISIT_TYPE(signed char, int);
VISIT_TYPE(unsigned char, unsigned);
VISIT_TYPE(short, int);
VISIT_TYPE(unsigned short, unsigned);
#if LONG_MAX == INT_MAX
VISIT_TYPE(long, int);
VISIT_TYPE(unsigned long, unsigned);
#else
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VISIT_TYPE(long, long long);
VISIT_TYPE(unsigned long, unsigned long long);
#endif
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#define CHECK_ARG(Char, expected, value) \
{ \
testing::StrictMock<mock_visitor<decltype(expected)>> visitor; \
EXPECT_CALL(visitor, visit(expected)); \
using iterator = std::back_insert_iterator<buffer<Char>>; \
fmt::visit_format_arg( \
visitor, \
fmt::detail::make_arg<fmt::basic_format_context<iterator, Char>>( \
value)); \
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}
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#define CHECK_ARG_SIMPLE(value) \
{ \
using value_type = decltype(value); \
typename visit_type<value_type>::type expected = value; \
CHECK_ARG(char, expected, value) \
CHECK_ARG(wchar_t, expected, value) \
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}
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template <typename T> class numeric_arg_test : public testing::Test {};
using types =
testing::Types<bool, signed char, unsigned char, short, unsigned short, int,
unsigned, long, unsigned long, long long, unsigned long long,
float, double, long double>;
TYPED_TEST_SUITE(numeric_arg_test, types);
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template <typename T, fmt::enable_if_t<std::is_integral<T>::value, int> = 0>
T test_value() {
return static_cast<T>(42);
}
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template <typename T,
fmt::enable_if_t<std::is_floating_point<T>::value, int> = 0>
T test_value() {
return static_cast<T>(4.2);
}
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TYPED_TEST(numeric_arg_test, make_and_visit) {
CHECK_ARG_SIMPLE(test_value<TypeParam>());
CHECK_ARG_SIMPLE(std::numeric_limits<TypeParam>::min());
CHECK_ARG_SIMPLE(std::numeric_limits<TypeParam>::max());
}
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TEST(arg_test, char_arg) {
CHECK_ARG(char, 'a', 'a');
CHECK_ARG(wchar_t, L'a', 'a');
CHECK_ARG(wchar_t, L'a', L'a');
}
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TEST(arg_test, string_arg) {
char str_data[] = "test";
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char* str = str_data;
const char* cstr = str;
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CHECK_ARG(char, cstr, str);
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auto sv = fmt::string_view(str);
CHECK_ARG(char, sv, std::string(str));
}
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TEST(arg_test, wstring_arg) {
wchar_t str_data[] = L"test";
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wchar_t* str = str_data;
const wchar_t* cstr = str;
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auto sv = fmt::wstring_view(str);
CHECK_ARG(wchar_t, cstr, str);
CHECK_ARG(wchar_t, cstr, cstr);
CHECK_ARG(wchar_t, sv, std::wstring(str));
CHECK_ARG(wchar_t, sv, fmt::wstring_view(str));
}
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TEST(arg_test, pointer_arg) {
void* p = nullptr;
const void* cp = nullptr;
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CHECK_ARG(char, cp, p);
CHECK_ARG(wchar_t, cp, p);
CHECK_ARG_SIMPLE(cp);
}
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struct check_custom {
test_result operator()(
fmt::basic_format_arg<fmt::format_context>::handle h) const {
struct test_buffer final : fmt::detail::buffer<char> {
char data[10];
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test_buffer() : fmt::detail::buffer<char>(data, 0, 10) {}
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void grow(size_t) {}
} buffer;
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auto parse_ctx = fmt::format_parse_context("");
auto ctx = fmt::format_context(fmt::detail::buffer_appender<char>(buffer),
fmt::format_args());
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h.format(parse_ctx, ctx);
EXPECT_EQ("test", std::string(buffer.data, buffer.size()));
return test_result();
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}
};
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TEST(arg_test, custom_arg) {
auto test = test_struct();
using visitor =
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mock_visitor<fmt::basic_format_arg<fmt::format_context>::handle>;
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testing::StrictMock<visitor> v;
EXPECT_CALL(v, visit(_)).WillOnce(Invoke(check_custom()));
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fmt::visit_format_arg(v, fmt::detail::make_arg<fmt::format_context>(test));
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}
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TEST(arg_test, visit_invalid_arg) {
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testing::StrictMock<mock_visitor<fmt::monostate>> visitor;
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EXPECT_CALL(visitor, visit(_));
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auto arg = fmt::basic_format_arg<fmt::format_context>();
fmt::visit_format_arg(visitor, arg);
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}
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struct enabled_formatter {};
struct disabled_formatter {};
struct disabled_formatter_convertible {
operator int() const { return 42; }
};
FMT_BEGIN_NAMESPACE
template <> struct formatter<enabled_formatter> {
auto parse(format_parse_context& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
auto format(enabled_formatter, format_context& ctx) -> decltype(ctx.out()) {
return ctx.out();
}
};
FMT_END_NAMESPACE
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TEST(core_test, has_formatter) {
using fmt::has_formatter;
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using context = fmt::format_context;
static_assert(has_formatter<enabled_formatter, context>::value, "");
static_assert(!has_formatter<disabled_formatter, context>::value, "");
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static_assert(!has_formatter<disabled_formatter_convertible, context>::value,
"");
}
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TEST(core_test, is_formattable) {
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static_assert(fmt::is_formattable<enabled_formatter>::value, "");
static_assert(!fmt::is_formattable<disabled_formatter>::value, "");
static_assert(fmt::is_formattable<disabled_formatter_convertible>::value, "");
}
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TEST(core_test, format) { EXPECT_EQ(fmt::format("{}", 42), "42"); }
TEST(core_test, format_to) {
std::string s;
fmt::format_to(std::back_inserter(s), "{}", 42);
EXPECT_EQ(s, "42");
}
struct convertible_to_int {
operator int() const { return 42; }
};
struct convertible_to_c_string {
operator const char*() const { return "foo"; }
};
FMT_BEGIN_NAMESPACE
template <> struct formatter<convertible_to_int> {
auto parse(format_parse_context& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
auto format(convertible_to_int, format_context& ctx) -> decltype(ctx.out()) {
return std::copy_n("foo", 3, ctx.out());
}
};
template <> struct formatter<convertible_to_c_string> {
FMT_CONSTEXPR auto parse(format_parse_context& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
auto format(convertible_to_c_string, format_context& ctx)
-> decltype(ctx.out()) {
return std::copy_n("bar", 3, ctx.out());
}
};
FMT_END_NAMESPACE
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TEST(core_test, formatter_overrides_implicit_conversion) {
EXPECT_EQ(fmt::format("{}", convertible_to_int()), "foo");
EXPECT_EQ(fmt::format("{}", convertible_to_c_string()), "bar");
}
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// Test that check is not found by ADL.
template <typename T> void check(T);
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TEST(core_test, adl_check) {
EXPECT_EQ(fmt::format("{}", test_struct()), "test");
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}
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TEST(core_test, to_string_view_foreign_strings) {
using namespace test_ns;
EXPECT_EQ(to_string_view(test_string<char>("42")), "42");
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fmt::detail::type type =
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fmt::detail::mapped_type_constant<test_string<char>,
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fmt::format_context>::value;
EXPECT_EQ(type, fmt::detail::type::string_type);
}
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TEST(core_test, format_foreign_strings) {
using namespace test_ns;
EXPECT_EQ(fmt::format(test_string<char>("{}"), 42), "42");
}
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struct implicitly_convertible_to_string {
operator std::string() const { return "foo"; }
};
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struct implicitly_convertible_to_string_view {
operator fmt::string_view() const { return "foo"; }
};
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TEST(core_test, format_implicitly_convertible_to_string_view) {
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EXPECT_EQ("foo", fmt::format("{}", implicitly_convertible_to_string_view()));
}
// std::is_constructible is broken in MSVC until version 2015.
#if !FMT_MSC_VER || FMT_MSC_VER >= 1900
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struct explicitly_convertible_to_string_view {
explicit operator fmt::string_view() const { return "foo"; }
};
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TEST(core_test, format_explicitly_convertible_to_string_view) {
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EXPECT_EQ("foo", fmt::format("{}", explicitly_convertible_to_string_view()));
}
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# ifdef FMT_USE_STRING_VIEW
struct explicitly_convertible_to_std_string_view {
explicit operator std::string_view() const { return "foo"; }
};
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TEST(core_test, format_explicitly_convertible_to_std_string_view) {
EXPECT_EQ("foo",
fmt::format("{}", explicitly_convertible_to_std_string_view()));
}
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# endif
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#endif
struct disabled_rvalue_conversion {
operator const char*() const& { return "foo"; }
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operator const char*() & { return "foo"; }
operator const char*() const&& = delete;
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operator const char*() && = delete;
};
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TEST(core_test, disabled_rvalue_conversion) {
EXPECT_EQ("foo", fmt::format("{}", disabled_rvalue_conversion()));
}