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// Formatting library for C++ - std::ostream support tests
//
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.
#define FMT_STRING_ALIAS 1
#include "fmt/ostream.h"
#include <sstream>
#include "gmock.h"
#include "gtest-extra.h"
#include "util.h"
using fmt::format;
using fmt::format_error;
static std::ostream &operator<<(std::ostream &os, const Date &d) {
os << d.year() << '-' << d.month() << '-' << d.day();
return os;
}
static std::wostream &operator<<(std::wostream &os, const Date &d) {
os << d.year() << L'-' << d.month() << L'-' << d.day();
return os;
}
enum TestEnum {};
static std::ostream &operator<<(std::ostream &os, TestEnum) {
return os << "TestEnum";
}
static std::wostream &operator<<(std::wostream &os, TestEnum) {
return os << L"TestEnum";
}
enum TestEnum2 {A};
TEST(OStreamTest, Enum) {
EXPECT_FALSE((fmt::convert_to_int<TestEnum, char>::value));
EXPECT_EQ("TestEnum", fmt::format("{}", TestEnum()));
EXPECT_EQ("0", fmt::format("{}", A));
EXPECT_FALSE((fmt::convert_to_int<TestEnum, wchar_t>::value));
EXPECT_EQ(L"TestEnum", fmt::format(L"{}", TestEnum()));
EXPECT_EQ(L"0", fmt::format(L"{}", A));
}
typedef fmt::back_insert_range<fmt::internal::buffer> range;
struct test_arg_formatter: fmt::arg_formatter<range> {
test_arg_formatter(fmt::format_context &ctx, fmt::format_specs &s)
: fmt::arg_formatter<range>(ctx, &s) {}
};
TEST(OStreamTest, CustomArg) {
fmt::memory_buffer buffer;
fmt::internal::buffer &base = buffer;
fmt::format_context ctx(std::back_inserter(base), "", fmt::format_args());
fmt::format_specs spec;
test_arg_formatter af(ctx, spec);
visit(af, fmt::internal::make_arg<fmt::format_context>(TestEnum()));
EXPECT_EQ("TestEnum", std::string(buffer.data(), buffer.size()));
}
TEST(OStreamTest, Format) {
EXPECT_EQ("a string", format("{0}", TestString("a string")));
std::string s = format("The date is {0}", Date(2012, 12, 9));
EXPECT_EQ("The date is 2012-12-9", s);
Date date(2012, 12, 9);
EXPECT_EQ(L"The date is 2012-12-9",
format(L"The date is {0}", Date(2012, 12, 9)));
}
TEST(OStreamTest, FormatSpecs) {
EXPECT_EQ("def ", format("{0:<5}", TestString("def")));
EXPECT_EQ(" def", format("{0:>5}", TestString("def")));
EXPECT_THROW_MSG(format("{0:=5}", TestString("def")),
format_error, "format specifier requires numeric argument");
EXPECT_EQ(" def ", format("{0:^5}", TestString("def")));
EXPECT_EQ("def**", format("{0:*<5}", TestString("def")));
EXPECT_THROW_MSG(format("{0:+}", TestString()),
format_error, "format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{0:-}", TestString()),
format_error, "format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{0: }", TestString()),
format_error, "format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{0:#}", TestString()),
format_error, "format specifier requires numeric argument");
EXPECT_THROW_MSG(format("{0:05}", TestString()),
format_error, "format specifier requires numeric argument");
EXPECT_EQ("test ", format("{0:13}", TestString("test")));
EXPECT_EQ("test ", format("{0:{1}}", TestString("test"), 13));
EXPECT_EQ("te", format("{0:.2}", TestString("test")));
EXPECT_EQ("te", format("{0:.{1}}", TestString("test"), 2));
}
struct EmptyTest {};
static std::ostream &operator<<(std::ostream &os, EmptyTest) {
return os << "";
}
TEST(OStreamTest, EmptyCustomOutput) {
EXPECT_EQ("", fmt::format("{}", EmptyTest()));
}
TEST(OStreamTest, Print) {
std::ostringstream os;
fmt::print(os, "Don't {}!", "panic");
EXPECT_EQ("Don't panic!", os.str());
std::wostringstream wos;
fmt::print(wos, L"Don't {}!", L"panic");
EXPECT_EQ(L"Don't panic!", wos.str());
}
TEST(OStreamTest, WriteToOStream) {
std::ostringstream os;
fmt::memory_buffer buffer;
const char *foo = "foo";
buffer.append(foo, foo + std::strlen(foo));
fmt::internal::write(os, buffer);
EXPECT_EQ("foo", os.str());
}
TEST(OStreamTest, WriteToOStreamMaxSize) {
std::size_t max_size = std::numeric_limits<std::size_t>::max();
std::streamsize max_streamsize = std::numeric_limits<std::streamsize>::max();
if (max_size <= fmt::internal::to_unsigned(max_streamsize))
return;
struct test_buffer : fmt::internal::buffer {
explicit test_buffer(std::size_t size) { resize(size); }
void grow(std::size_t) {}
} buffer(max_size);
struct mock_streambuf : std::streambuf {
MOCK_METHOD2(xsputn, std::streamsize (const void *s, std::streamsize n));
std::streamsize xsputn(const char *s, std::streamsize n) {
const void *v = s;
return xsputn(v, n);
}
} streambuf;
struct test_ostream : std::ostream {
explicit test_ostream(mock_streambuf &buffer) : std::ostream(&buffer) {}
} os(streambuf);
testing::InSequence sequence;
const char *data = FMT_NULL;
typedef std::make_unsigned<std::streamsize>::type ustreamsize;
ustreamsize size = max_size;
do {
auto n = std::min(size, fmt::internal::to_unsigned(max_streamsize));
EXPECT_CALL(streambuf, xsputn(data, static_cast<std::streamsize>(n)))
.WillOnce(testing::Return(max_streamsize));
data += n;
size -= n;
} while (size != 0);
fmt::internal::write(os, buffer);
}
TEST(OStreamTest, Join) {
int v[3] = {1, 2, 3};
EXPECT_EQ("1, 2, 3", fmt::format("{}", fmt::join(v, v + 3, ", ")));
}
#if FMT_USE_CONSTEXPR
TEST(OStreamTest, ConstexprString) {
EXPECT_EQ("42", format(fmt("{}"), std::string("42")));
}
#endif
namespace fmt_test {
struct ABC {};
template <typename Output> Output &operator<<(Output &out, ABC) {
out << "ABC";
return out;
}
} // namespace fmt_test
TEST(FormatTest, FormatToN) {
char buffer[4];
buffer[3] = 'x';
auto result = fmt::format_to_n(buffer, 3, "{}", fmt_test::ABC());
EXPECT_EQ(3u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ("ABCx", fmt::string_view(buffer, 4));
result = fmt::format_to_n(buffer, 3, "x{}y", fmt_test::ABC());
EXPECT_EQ(5u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ("xABx", fmt::string_view(buffer, 4));
}
#if FMT_USE_USER_DEFINED_LITERALS
TEST(FormatTest, UDL) {
using namespace fmt::literals;
EXPECT_EQ("{}"_format("test"), "test");
}
#endif
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