fmt/test/ostream-test.cc

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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.
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#define FMT_STRING_ALIAS 1
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#include "fmt/format.h"
struct test {};
// Test that there is no issues with specializations when fmt/ostream.h is
// included after fmt/format.h.
namespace fmt {
template <> struct formatter<test> : formatter<int> {
template <typename FormatContext>
typename FormatContext::iterator format(const test&, FormatContext& ctx) {
return formatter<int>::format(42, ctx);
}
};
} // namespace fmt
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#include "fmt/ostream.h"
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#include <sstream>
#include "gmock.h"
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#include "gtest-extra.h"
#include "util.h"
using fmt::format;
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using fmt::format_error;
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static std::ostream& operator<<(std::ostream& os, const Date& d) {
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os << d.year() << '-' << d.month() << '-' << d.day();
return os;
}
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static std::wostream& operator<<(std::wostream& os, const Date& d) {
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os << d.year() << L'-' << d.month() << L'-' << d.day();
return os;
}
// Make sure that overloaded comma operators do no harm to is_streamable.
struct type_with_comma_op {};
template <typename T> void operator,(type_with_comma_op, const T&);
template <typename T> type_with_comma_op operator<<(T&, const Date&);
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enum TestEnum {};
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static std::ostream& operator<<(std::ostream& os, TestEnum) {
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return os << "TestEnum";
}
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static std::wostream& operator<<(std::wostream& os, TestEnum) {
return os << L"TestEnum";
}
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enum TestEnum2 { A };
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TEST(OStreamTest, Enum) {
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EXPECT_FALSE((fmt::convert_to_int<TestEnum, char>::value));
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EXPECT_EQ("TestEnum", fmt::format("{}", TestEnum()));
EXPECT_EQ("0", fmt::format("{}", A));
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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));
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}
typedef fmt::back_insert_range<fmt::internal::buffer<char>> range;
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struct test_arg_formatter : fmt::arg_formatter<range> {
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fmt::format_parse_context parse_ctx;
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test_arg_formatter(fmt::format_context& ctx, fmt::format_specs& s)
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: fmt::arg_formatter<range>(ctx, &parse_ctx, &s), parse_ctx("") {}
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};
TEST(OStreamTest, CustomArg) {
fmt::memory_buffer buffer;
fmt::internal::buffer<char>& base = buffer;
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fmt::format_context ctx(std::back_inserter(base), fmt::format_args());
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fmt::format_specs spec;
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test_arg_formatter af(ctx, spec);
fmt::visit_format_arg(
af, fmt::internal::make_arg<fmt::format_context>(TestEnum()));
EXPECT_EQ("TestEnum", std::string(buffer.data(), buffer.size()));
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}
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")));
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EXPECT_THROW_MSG(format("{0:=5}", TestString("def")), format_error,
"format specifier requires numeric argument");
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EXPECT_EQ(" def ", format("{0:^5}", TestString("def")));
EXPECT_EQ("def**", format("{0:*<5}", TestString("def")));
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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");
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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 {};
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static std::ostream& operator<<(std::ostream& os, EmptyTest) {
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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());
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}
TEST(OStreamTest, WriteToOStream) {
std::ostringstream os;
fmt::memory_buffer buffer;
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const char* foo = "foo";
buffer.append(foo, foo + std::strlen(foo));
fmt::internal::write(os, buffer);
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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();
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if (max_size <= fmt::internal::to_unsigned(max_streamsize)) return;
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struct test_buffer : fmt::internal::buffer<char> {
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explicit test_buffer(std::size_t size) { resize(size); }
void grow(std::size_t) {}
} buffer(max_size);
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struct mock_streambuf : std::streambuf {
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MOCK_METHOD2(xsputn, std::streamsize(const void* s, std::streamsize n));
std::streamsize xsputn(const char* s, std::streamsize n) {
const void* v = s;
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return xsputn(v, n);
}
} streambuf;
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struct test_ostream : std::ostream {
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explicit test_ostream(mock_streambuf& buffer) : std::ostream(&buffer) {}
} os(streambuf);
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testing::InSequence sequence;
const char* data = nullptr;
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typedef std::make_unsigned<std::streamsize>::type ustreamsize;
ustreamsize size = max_size;
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do {
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auto n = std::min(size, fmt::internal::to_unsigned(max_streamsize));
EXPECT_CALL(streambuf, xsputn(data, static_cast<std::streamsize>(n)))
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.WillOnce(testing::Return(max_streamsize));
data += n;
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size -= n;
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} while (size != 0);
fmt::internal::write(os, buffer);
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}
TEST(OStreamTest, Join) {
int v[3] = {1, 2, 3};
EXPECT_EQ("1, 2, 3", fmt::format("{}", fmt::join(v, v + 3, ", ")));
}
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#if FMT_USE_CONSTEXPR
TEST(OStreamTest, ConstexprString) {
EXPECT_EQ("42", format(fmt("{}"), std::string("42")));
EXPECT_EQ("a string", format(fmt("{0}"), TestString("a string")));
}
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#endif
namespace fmt_test {
struct ABC {};
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template <typename Output> Output& operator<<(Output& out, ABC) {
out << "ABC";
return out;
}
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} // namespace fmt_test
template <typename T> struct TestTemplate {};
template <typename T>
std::ostream& operator<<(std::ostream& os, TestTemplate<T>) {
return os << 1;
}
namespace fmt {
template <typename T> struct formatter<TestTemplate<T>> : formatter<int> {
template <typename FormatContext>
typename FormatContext::iterator format(TestTemplate<T>, FormatContext& ctx) {
return formatter<int>::format(2, ctx);
}
};
} // namespace fmt
#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 407
TEST(OStreamTest, Template) {
EXPECT_EQ("2", fmt::format("{}", TestTemplate<int>()));
}
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));
}
#endif
#if FMT_USE_USER_DEFINED_LITERALS
TEST(FormatTest, UDL) {
using namespace fmt::literals;
EXPECT_EQ("{}"_format("test"), "test");
}
#endif