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abseil-cpp/absl/strings/str_format_test.cc

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// Copyright 2020 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/strings/str_format.h"
#include <cstdarg>
#include <cstdint>
#include <cstdio>
#include <string>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/strings/cord.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace {
using str_format_internal::FormatArgImpl;
using FormatEntryPointTest = ::testing::Test;
TEST_F(FormatEntryPointTest, Format) {
std::string sink;
EXPECT_TRUE(Format(&sink, "A format %d", 123));
EXPECT_EQ("A format 123", sink);
sink.clear();
ParsedFormat<'d'> pc("A format %d");
EXPECT_TRUE(Format(&sink, pc, 123));
EXPECT_EQ("A format 123", sink);
}
TEST_F(FormatEntryPointTest, FormatWithV) {
std::string sink;
EXPECT_TRUE(Format(&sink, "A format %v", 123));
EXPECT_EQ("A format 123", sink);
sink.clear();
ParsedFormat<'v'> pc("A format %v");
EXPECT_TRUE(Format(&sink, pc, 123));
EXPECT_EQ("A format 123", sink);
}
TEST_F(FormatEntryPointTest, UntypedFormat) {
constexpr const char* formats[] = {
"",
"a",
"%80d",
#if !defined(_MSC_VER) && !defined(__ANDROID__) && !defined(__native_client__)
// MSVC, NaCL and Android don't support positional syntax.
"complicated multipart %% %1$d format %1$0999d",
#endif // _MSC_VER
};
for (const char* fmt : formats) {
std::string actual;
int i = 123;
FormatArgImpl arg_123(i);
absl::Span<const FormatArgImpl> args(&arg_123, 1);
UntypedFormatSpec format(fmt);
EXPECT_TRUE(FormatUntyped(&actual, format, args));
char buf[4096]{};
snprintf(buf, sizeof(buf), fmt, 123);
EXPECT_EQ(
str_format_internal::FormatPack(
str_format_internal::UntypedFormatSpecImpl::Extract(format), args),
buf);
EXPECT_EQ(actual, buf);
}
// The internal version works with a preparsed format.
ParsedFormat<'d'> pc("A format %d");
int i = 345;
FormatArg arg(i);
std::string out;
EXPECT_TRUE(str_format_internal::FormatUntyped(
&out, str_format_internal::UntypedFormatSpecImpl(&pc), {&arg, 1}));
EXPECT_EQ("A format 345", out);
}
TEST_F(FormatEntryPointTest, StringFormat) {
EXPECT_EQ("123", StrFormat("%d", 123));
constexpr absl::string_view view("=%d=", 4);
EXPECT_EQ("=123=", StrFormat(view, 123));
}
TEST_F(FormatEntryPointTest, StringFormatV) {
std::string hello = "hello";
EXPECT_EQ("hello", StrFormat("%v", hello));
EXPECT_EQ("123", StrFormat("%v", 123));
constexpr absl::string_view view("=%v=", 4);
EXPECT_EQ("=123=", StrFormat(view, 123));
}
TEST_F(FormatEntryPointTest, AppendFormat) {
std::string s;
std::string& r = StrAppendFormat(&s, "%d", 123);
EXPECT_EQ(&s, &r); // should be same object
EXPECT_EQ("123", r);
}
TEST_F(FormatEntryPointTest, AppendFormatWithV) {
std::string s;
std::string& r = StrAppendFormat(&s, "%v", 123);
EXPECT_EQ(&s, &r); // should be same object
EXPECT_EQ("123", r);
}
TEST_F(FormatEntryPointTest, AppendFormatFail) {
std::string s = "orig";
UntypedFormatSpec format(" more %d");
FormatArgImpl arg("not an int");
EXPECT_EQ("orig",
str_format_internal::AppendPack(
&s, str_format_internal::UntypedFormatSpecImpl::Extract(format),
{&arg, 1}));
}
TEST_F(FormatEntryPointTest, AppendFormatFailWithV) {
std::string s = "orig";
UntypedFormatSpec format(" more %v");
FormatArgImpl arg("not an int");
EXPECT_EQ("orig",
str_format_internal::AppendPack(
&s, str_format_internal::UntypedFormatSpecImpl::Extract(format),
{&arg, 1}));
}
TEST_F(FormatEntryPointTest, ManyArgs) {
EXPECT_EQ("24", StrFormat("%24$d", 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24));
EXPECT_EQ("60", StrFormat("%60$d", 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
53, 54, 55, 56, 57, 58, 59, 60));
}
TEST_F(FormatEntryPointTest, Preparsed) {
ParsedFormat<'d'> pc("%d");
EXPECT_EQ("123", StrFormat(pc, 123));
// rvalue ok?
EXPECT_EQ("123", StrFormat(ParsedFormat<'d'>("%d"), 123));
constexpr absl::string_view view("=%d=", 4);
EXPECT_EQ("=123=", StrFormat(ParsedFormat<'d'>(view), 123));
}
TEST_F(FormatEntryPointTest, PreparsedWithV) {
ParsedFormat<'v'> pc("%v");
EXPECT_EQ("123", StrFormat(pc, 123));
// rvalue ok?
EXPECT_EQ("123", StrFormat(ParsedFormat<'v'>("%v"), 123));
constexpr absl::string_view view("=%v=", 4);
EXPECT_EQ("=123=", StrFormat(ParsedFormat<'v'>(view), 123));
}
TEST_F(FormatEntryPointTest, FormatCountCapture) {
int n = 0;
EXPECT_EQ("", StrFormat("%n", FormatCountCapture(&n)));
EXPECT_EQ(0, n);
EXPECT_EQ("123", StrFormat("%d%n", 123, FormatCountCapture(&n)));
EXPECT_EQ(3, n);
}
TEST_F(FormatEntryPointTest, FormatCountCaptureWithV) {
int n = 0;
EXPECT_EQ("", StrFormat("%n", FormatCountCapture(&n)));
EXPECT_EQ(0, n);
EXPECT_EQ("123", StrFormat("%v%n", 123, FormatCountCapture(&n)));
EXPECT_EQ(3, n);
}
TEST_F(FormatEntryPointTest, FormatCountCaptureWrongType) {
// Should reject int*.
int n = 0;
UntypedFormatSpec format("%d%n");
int i = 123, *ip = &n;
FormatArgImpl args[2] = {FormatArgImpl(i), FormatArgImpl(ip)};
EXPECT_EQ("", str_format_internal::FormatPack(
str_format_internal::UntypedFormatSpecImpl::Extract(format),
absl::MakeSpan(args)));
}
TEST_F(FormatEntryPointTest, FormatCountCaptureWrongTypeWithV) {
// Should reject int*.
int n = 0;
UntypedFormatSpec format("%v%n");
int i = 123, *ip = &n;
FormatArgImpl args[2] = {FormatArgImpl(i), FormatArgImpl(ip)};
EXPECT_EQ("", str_format_internal::FormatPack(
str_format_internal::UntypedFormatSpecImpl::Extract(format),
absl::MakeSpan(args)));
}
TEST_F(FormatEntryPointTest, FormatCountCaptureMultiple) {
int n1 = 0;
int n2 = 0;
EXPECT_EQ(" 1 2",
StrFormat("%5d%n%10d%n", 1, FormatCountCapture(&n1), 2,
FormatCountCapture(&n2)));
EXPECT_EQ(5, n1);
EXPECT_EQ(15, n2);
}
TEST_F(FormatEntryPointTest, FormatCountCaptureExample) {
int n;
std::string s;
StrAppendFormat(&s, "%s: %n%s\n", "(1,1)", FormatCountCapture(&n), "(1,2)");
StrAppendFormat(&s, "%*s%s\n", n, "", "(2,2)");
EXPECT_EQ(7, n);
EXPECT_EQ(
"(1,1): (1,2)\n"
" (2,2)\n",
s);
}
TEST_F(FormatEntryPointTest, FormatCountCaptureExampleWithV) {
int n;
std::string s;
std::string a1 = "(1,1)";
std::string a2 = "(1,2)";
std::string a3 = "(2,2)";
StrAppendFormat(&s, "%v: %n%v\n", a1, FormatCountCapture(&n), a2);
StrAppendFormat(&s, "%*s%v\n", n, "", a3);
EXPECT_EQ(7, n);
EXPECT_EQ(
"(1,1): (1,2)\n"
" (2,2)\n",
s);
}
TEST_F(FormatEntryPointTest, Stream) {
const std::string formats[] = {
"",
"a",
"%80d",
"%d %u %c %s %f %g",
#if !defined(_MSC_VER) && !defined(__ANDROID__) && !defined(__native_client__)
// MSVC, NaCL and Android don't support positional syntax.
"complicated multipart %% %1$d format %1$080d",
#endif // _MSC_VER
};
std::string buf(4096, '\0');
for (const auto& fmt : formats) {
const auto parsed =
ParsedFormat<'d', 'u', 'c', 's', 'f', 'g'>::NewAllowIgnored(fmt);
std::ostringstream oss;
oss << StreamFormat(*parsed, 123, 3, 49, "multistreaming!!!", 1.01, 1.01);
int fmt_result = snprintf(&*buf.begin(), buf.size(), fmt.c_str(), //
123, 3, 49, "multistreaming!!!", 1.01, 1.01);
ASSERT_TRUE(oss) << fmt;
ASSERT_TRUE(fmt_result >= 0 && static_cast<size_t>(fmt_result) < buf.size())
<< fmt_result;
EXPECT_EQ(buf.c_str(), oss.str());
}
}
TEST_F(FormatEntryPointTest, StreamWithV) {
const std::string formats[] = {
"",
"a",
"%v %u %c %v %f %v",
};
const std::string formats_for_buf[] = {
"",
"a",
"%d %u %c %s %f %g",
};
std::string buf(4096, '\0');
for (auto i = 0; i < ABSL_ARRAYSIZE(formats); ++i) {
const auto parsed =
ParsedFormat<'v', 'u', 'c', 'v', 'f', 'v'>::NewAllowIgnored(formats[i]);
std::ostringstream oss;
oss << StreamFormat(*parsed, 123, 3, 49,
absl::string_view("multistreaming!!!"), 1.01, 1.01);
int fmt_result =
snprintf(&*buf.begin(), buf.size(), formats_for_buf[i].c_str(), //
123, 3, 49, "multistreaming!!!", 1.01, 1.01);
ASSERT_TRUE(oss) << formats[i];
ASSERT_TRUE(fmt_result >= 0 && static_cast<size_t>(fmt_result) < buf.size())
<< fmt_result;
EXPECT_EQ(buf.c_str(), oss.str());
}
}
TEST_F(FormatEntryPointTest, StreamOk) {
std::ostringstream oss;
oss << StreamFormat("hello %d", 123);
EXPECT_EQ("hello 123", oss.str());
EXPECT_TRUE(oss.good());
}
TEST_F(FormatEntryPointTest, StreamOkWithV) {
std::ostringstream oss;
oss << StreamFormat("hello %v", 123);
EXPECT_EQ("hello 123", oss.str());
EXPECT_TRUE(oss.good());
}
TEST_F(FormatEntryPointTest, StreamFail) {
std::ostringstream oss;
UntypedFormatSpec format("hello %d");
FormatArgImpl arg("non-numeric");
oss << str_format_internal::Streamable(
str_format_internal::UntypedFormatSpecImpl::Extract(format), {&arg, 1});
EXPECT_EQ("hello ", oss.str()); // partial write
EXPECT_TRUE(oss.fail());
}
TEST_F(FormatEntryPointTest, StreamFailWithV) {
std::ostringstream oss;
UntypedFormatSpec format("hello %v");
FormatArgImpl arg("non-numeric");
oss << str_format_internal::Streamable(
str_format_internal::UntypedFormatSpecImpl::Extract(format), {&arg, 1});
EXPECT_EQ("hello ", oss.str()); // partial write
EXPECT_TRUE(oss.fail());
}
std::string WithSnprintf(const char* fmt, ...) {
std::string buf;
buf.resize(128);
va_list va;
va_start(va, fmt);
int r = vsnprintf(&*buf.begin(), buf.size(), fmt, va);
va_end(va);
EXPECT_GE(r, 0);
EXPECT_LT(r, buf.size());
buf.resize(r);
return buf;
}
TEST_F(FormatEntryPointTest, FloatPrecisionArg) {
// Test that positional parameters for width and precision
// are indexed to precede the value.
// Also sanity check the same formats against snprintf.
EXPECT_EQ("0.1", StrFormat("%.1f", 0.1));
EXPECT_EQ("0.1", WithSnprintf("%.1f", 0.1));
EXPECT_EQ(" 0.1", StrFormat("%*.1f", 5, 0.1));
EXPECT_EQ(" 0.1", WithSnprintf("%*.1f", 5, 0.1));
EXPECT_EQ("0.1", StrFormat("%.*f", 1, 0.1));
EXPECT_EQ("0.1", WithSnprintf("%.*f", 1, 0.1));
EXPECT_EQ(" 0.1", StrFormat("%*.*f", 5, 1, 0.1));
EXPECT_EQ(" 0.1", WithSnprintf("%*.*f", 5, 1, 0.1));
}
namespace streamed_test {
struct X {};
std::ostream& operator<<(std::ostream& os, const X&) {
return os << "X";
}
} // streamed_test
TEST_F(FormatEntryPointTest, FormatStreamed) {
EXPECT_EQ("123", StrFormat("%s", FormatStreamed(123)));
EXPECT_EQ(" 123", StrFormat("%5s", FormatStreamed(123)));
EXPECT_EQ("123 ", StrFormat("%-5s", FormatStreamed(123)));
EXPECT_EQ("X", StrFormat("%s", FormatStreamed(streamed_test::X())));
EXPECT_EQ("123", StrFormat("%s", FormatStreamed(StreamFormat("%d", 123))));
}
TEST_F(FormatEntryPointTest, FormatStreamedWithV) {
EXPECT_EQ("123", StrFormat("%v", FormatStreamed(123)));
EXPECT_EQ("X", StrFormat("%v", FormatStreamed(streamed_test::X())));
EXPECT_EQ("123", StrFormat("%v", FormatStreamed(StreamFormat("%d", 123))));
}
// Helper class that creates a temporary file and exposes a FILE* to it.
// It will close the file on destruction.
class TempFile {
public:
TempFile() : file_(std::tmpfile()) {}
~TempFile() { std::fclose(file_); }
std::FILE* file() const { return file_; }
// Read the file into a string.
std::string ReadFile() {
std::fseek(file_, 0, SEEK_END);
int size = std::ftell(file_);
EXPECT_GT(size, 0);
std::rewind(file_);
std::string str(2 * size, ' ');
int read_bytes = std::fread(&str[0], 1, str.size(), file_);
EXPECT_EQ(read_bytes, size);
str.resize(read_bytes);
EXPECT_TRUE(std::feof(file_));
return str;
}
private:
std::FILE* file_;
};
TEST_F(FormatEntryPointTest, FPrintF) {
TempFile tmp;
int result =
FPrintF(tmp.file(), "STRING: %s NUMBER: %010d", std::string("ABC"), -19);
EXPECT_EQ(result, 30);
EXPECT_EQ(tmp.ReadFile(), "STRING: ABC NUMBER: -000000019");
}
TEST_F(FormatEntryPointTest, FPrintFWithV) {
TempFile tmp;
int result =
FPrintF(tmp.file(), "STRING: %v NUMBER: %010d", std::string("ABC"), -19);
EXPECT_EQ(result, 30);
EXPECT_EQ(tmp.ReadFile(), "STRING: ABC NUMBER: -000000019");
}
TEST_F(FormatEntryPointTest, FPrintFError) {
errno = 0;
int result = FPrintF(stdin, "ABC");
EXPECT_LT(result, 0);
EXPECT_EQ(errno, EBADF);
}
#ifdef __GLIBC__
TEST_F(FormatEntryPointTest, FprintfTooLarge) {
std::FILE* f = std::fopen("/dev/null", "w");
int width = 2000000000;
errno = 0;
int result = FPrintF(f, "%*d %*d", width, 0, width, 0);
EXPECT_LT(result, 0);
EXPECT_EQ(errno, EFBIG);
std::fclose(f);
}
TEST_F(FormatEntryPointTest, PrintF) {
int stdout_tmp = dup(STDOUT_FILENO);
TempFile tmp;
std::fflush(stdout);
dup2(fileno(tmp.file()), STDOUT_FILENO);
int result = PrintF("STRING: %s NUMBER: %010d", std::string("ABC"), -19);
std::fflush(stdout);
dup2(stdout_tmp, STDOUT_FILENO);
close(stdout_tmp);
EXPECT_EQ(result, 30);
EXPECT_EQ(tmp.ReadFile(), "STRING: ABC NUMBER: -000000019");
}
TEST_F(FormatEntryPointTest, PrintFWithV) {
int stdout_tmp = dup(STDOUT_FILENO);
TempFile tmp;
std::fflush(stdout);
dup2(fileno(tmp.file()), STDOUT_FILENO);
int result = PrintF("STRING: %v NUMBER: %010d", std::string("ABC"), -19);
std::fflush(stdout);
dup2(stdout_tmp, STDOUT_FILENO);
close(stdout_tmp);
EXPECT_EQ(result, 30);
EXPECT_EQ(tmp.ReadFile(), "STRING: ABC NUMBER: -000000019");
}
#endif // __GLIBC__
TEST_F(FormatEntryPointTest, SNPrintF) {
char buffer[16];
int result =
SNPrintF(buffer, sizeof(buffer), "STRING: %s", std::string("ABC"));
EXPECT_EQ(result, 11);
EXPECT_EQ(std::string(buffer), "STRING: ABC");
result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %d", 123456);
EXPECT_EQ(result, 14);
EXPECT_EQ(std::string(buffer), "NUMBER: 123456");
result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %d", 1234567);
EXPECT_EQ(result, 15);
EXPECT_EQ(std::string(buffer), "NUMBER: 1234567");
result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %d", 12345678);
EXPECT_EQ(result, 16);
EXPECT_EQ(std::string(buffer), "NUMBER: 1234567");
result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %d", 123456789);
EXPECT_EQ(result, 17);
EXPECT_EQ(std::string(buffer), "NUMBER: 1234567");
result = SNPrintF(nullptr, 0, "Just checking the %s of the output.", "size");
EXPECT_EQ(result, 37);
}
TEST_F(FormatEntryPointTest, SNPrintFWithV) {
char buffer[16];
int result =
SNPrintF(buffer, sizeof(buffer), "STRING: %v", std::string("ABC"));
EXPECT_EQ(result, 11);
EXPECT_EQ(std::string(buffer), "STRING: ABC");
result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %v", 123456);
EXPECT_EQ(result, 14);
EXPECT_EQ(std::string(buffer), "NUMBER: 123456");
result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %v", 1234567);
EXPECT_EQ(result, 15);
EXPECT_EQ(std::string(buffer), "NUMBER: 1234567");
result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %v", 12345678);
EXPECT_EQ(result, 16);
EXPECT_EQ(std::string(buffer), "NUMBER: 1234567");
result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %v", 123456789);
EXPECT_EQ(result, 17);
EXPECT_EQ(std::string(buffer), "NUMBER: 1234567");
std::string size = "size";
result = SNPrintF(nullptr, 0, "Just checking the %v of the output.", size);
EXPECT_EQ(result, 37);
}
TEST(StrFormat, BehavesAsDocumented) {
std::string s = absl::StrFormat("%s, %d!", "Hello", 123);
EXPECT_EQ("Hello, 123!", s);
std::string hello = "Hello";
std::string s2 = absl::StrFormat("%v, %v!", hello, 123);
EXPECT_EQ("Hello, 123!", s2);
// The format of a replacement is
// '%'[position][flags][width['.'precision]][length_modifier][format]
EXPECT_EQ(absl::StrFormat("%1$+3.2Lf", 1.1), "+1.10");
// Text conversion:
// "c" - Character. Eg: 'a' -> "A", 20 -> " "
EXPECT_EQ(StrFormat("%c", 'a'), "a");
EXPECT_EQ(StrFormat("%c", 0x20), " ");
// Formats char and integral types: int, long, uint64_t, etc.
EXPECT_EQ(StrFormat("%c", int{'a'}), "a");
EXPECT_EQ(StrFormat("%c", long{'a'}), "a"); // NOLINT
EXPECT_EQ(StrFormat("%c", uint64_t{'a'}), "a");
// "s" - string Eg: "C" -> "C", std::string("C++") -> "C++"
// Formats std::string, char*, string_view, and Cord.
EXPECT_EQ(StrFormat("%s", "C"), "C");
EXPECT_EQ(StrFormat("%v", std::string("C")), "C");
EXPECT_EQ(StrFormat("%s", std::string("C++")), "C++");
EXPECT_EQ(StrFormat("%v", std::string("C++")), "C++");
EXPECT_EQ(StrFormat("%s", string_view("view")), "view");
EXPECT_EQ(StrFormat("%v", string_view("view")), "view");
EXPECT_EQ(StrFormat("%s", absl::Cord("cord")), "cord");
EXPECT_EQ(StrFormat("%v", absl::Cord("cord")), "cord");
// Integral Conversion
// These format integral types: char, int, long, uint64_t, etc.
EXPECT_EQ(StrFormat("%d", char{10}), "10");
EXPECT_EQ(StrFormat("%d", int{10}), "10");
EXPECT_EQ(StrFormat("%d", long{10}), "10"); // NOLINT
EXPECT_EQ(StrFormat("%d", uint64_t{10}), "10");
EXPECT_EQ(StrFormat("%v", int{10}), "10");
EXPECT_EQ(StrFormat("%v", long{10}), "10"); // NOLINT
EXPECT_EQ(StrFormat("%v", uint64_t{10}), "10");
// d,i - signed decimal Eg: -10 -> "-10"
EXPECT_EQ(StrFormat("%d", -10), "-10");
EXPECT_EQ(StrFormat("%i", -10), "-10");
EXPECT_EQ(StrFormat("%v", -10), "-10");
// o - octal Eg: 10 -> "12"
EXPECT_EQ(StrFormat("%o", 10), "12");
// u - unsigned decimal Eg: 10 -> "10"
EXPECT_EQ(StrFormat("%u", 10), "10");
EXPECT_EQ(StrFormat("%v", 10), "10");
// x/X - lower,upper case hex Eg: 10 -> "a"/"A"
EXPECT_EQ(StrFormat("%x", 10), "a");
EXPECT_EQ(StrFormat("%X", 10), "A");
// Floating-point, with upper/lower-case output.
// These format floating points types: float, double, long double, etc.
EXPECT_EQ(StrFormat("%.1f", float{1}), "1.0");
EXPECT_EQ(StrFormat("%.1f", double{1}), "1.0");
const long double long_double = 1.0;
EXPECT_EQ(StrFormat("%.1f", long_double), "1.0");
// These also format integral types: char, int, long, uint64_t, etc.:
EXPECT_EQ(StrFormat("%.1f", char{1}), "1.0");
EXPECT_EQ(StrFormat("%.1f", int{1}), "1.0");
EXPECT_EQ(StrFormat("%.1f", long{1}), "1.0"); // NOLINT
EXPECT_EQ(StrFormat("%.1f", uint64_t{1}), "1.0");
// f/F - decimal. Eg: 123456789 -> "123456789.000000"
EXPECT_EQ(StrFormat("%f", 123456789), "123456789.000000");
EXPECT_EQ(StrFormat("%F", 123456789), "123456789.000000");
// e/E - exponentiated Eg: .01 -> "1.00000e-2"/"1.00000E-2"
EXPECT_EQ(StrFormat("%e", .01), "1.000000e-02");
EXPECT_EQ(StrFormat("%E", .01), "1.000000E-02");
// g/G - exponentiate to fit Eg: .01 -> "0.01", 1e10 ->"1e+10"/"1E+10"
EXPECT_EQ(StrFormat("%g", .01), "0.01");
EXPECT_EQ(StrFormat("%g", 1e10), "1e+10");
EXPECT_EQ(StrFormat("%G", 1e10), "1E+10");
EXPECT_EQ(StrFormat("%v", .01), "0.01");
EXPECT_EQ(StrFormat("%v", 1e10), "1e+10");
// a/A - lower,upper case hex Eg: -3.0 -> "-0x1.8p+1"/"-0X1.8P+1"
// On Android platform <=21, there is a regression in hexfloat formatting.
#if !defined(__ANDROID_API__) || __ANDROID_API__ > 21
EXPECT_EQ(StrFormat("%.1a", -3.0), "-0x1.8p+1"); // .1 to fix MSVC output
EXPECT_EQ(StrFormat("%.1A", -3.0), "-0X1.8P+1"); // .1 to fix MSVC output
#endif
// Other conversion
int64_t value = 0x7ffdeb4;
auto ptr_value = static_cast<uintptr_t>(value);
const int& something = *reinterpret_cast<const int*>(ptr_value);
EXPECT_EQ(StrFormat("%p", &something), StrFormat("0x%x", ptr_value));
// Output widths are supported, with optional flags.
EXPECT_EQ(StrFormat("%3d", 1), " 1");
EXPECT_EQ(StrFormat("%3d", 123456), "123456");
EXPECT_EQ(StrFormat("%06.2f", 1.234), "001.23");
EXPECT_EQ(StrFormat("%+d", 1), "+1");
EXPECT_EQ(StrFormat("% d", 1), " 1");
EXPECT_EQ(StrFormat("%-4d", -1), "-1 ");
EXPECT_EQ(StrFormat("%#o", 10), "012");
EXPECT_EQ(StrFormat("%#x", 15), "0xf");
EXPECT_EQ(StrFormat("%04d", 8), "0008");
// Posix positional substitution.
EXPECT_EQ(absl::StrFormat("%2$s, %3$s, %1$s!", "vici", "veni", "vidi"),
"veni, vidi, vici!");
// Length modifiers are ignored.
EXPECT_EQ(StrFormat("%hhd", int{1}), "1");
EXPECT_EQ(StrFormat("%hd", int{1}), "1");
EXPECT_EQ(StrFormat("%ld", int{1}), "1");
EXPECT_EQ(StrFormat("%lld", int{1}), "1");
EXPECT_EQ(StrFormat("%Ld", int{1}), "1");
EXPECT_EQ(StrFormat("%jd", int{1}), "1");
EXPECT_EQ(StrFormat("%zd", int{1}), "1");
EXPECT_EQ(StrFormat("%td", int{1}), "1");
EXPECT_EQ(StrFormat("%qd", int{1}), "1");
// Bool is handled correctly depending on whether %v is used
EXPECT_EQ(StrFormat("%v", true), "true");
EXPECT_EQ(StrFormat("%v", false), "false");
EXPECT_EQ(StrFormat("%d", true), "1");
}
using str_format_internal::ExtendedParsedFormat;
using str_format_internal::ParsedFormatBase;
struct SummarizeConsumer {
std::string* out;
explicit SummarizeConsumer(std::string* out) : out(out) {}
bool Append(string_view s) {
*out += "[" + std::string(s) + "]";
return true;
}
bool ConvertOne(const str_format_internal::UnboundConversion& conv,
string_view s) {
*out += "{";
*out += std::string(s);
*out += ":";
*out += std::to_string(conv.arg_position) + "$";
if (conv.width.is_from_arg()) {
*out += std::to_string(conv.width.get_from_arg()) + "$*";
}
if (conv.precision.is_from_arg()) {
*out += "." + std::to_string(conv.precision.get_from_arg()) + "$*";
}
*out += str_format_internal::FormatConversionCharToChar(conv.conv);
*out += "}";
return true;
}
};
std::string SummarizeParsedFormat(const ParsedFormatBase& pc) {
std::string out;
if (!pc.ProcessFormat(SummarizeConsumer(&out))) out += "!";
return out;
}
using ParsedFormatTest = ::testing::Test;
TEST_F(ParsedFormatTest, SimpleChecked) {
EXPECT_EQ("[ABC]{d:1$d}[DEF]",
SummarizeParsedFormat(ParsedFormat<'d'>("ABC%dDEF")));
EXPECT_EQ("{s:1$s}[FFF]{d:2$d}[ZZZ]{f:3$f}",
SummarizeParsedFormat(ParsedFormat<'s', 'd', 'f'>("%sFFF%dZZZ%f")));
EXPECT_EQ("{s:1$s}[ ]{.*d:3$.2$*d}",
SummarizeParsedFormat(ParsedFormat<'s', '*', 'd'>("%s %.*d")));
}
TEST_F(ParsedFormatTest, SimpleCheckedWithV) {
EXPECT_EQ("[ABC]{v:1$v}[DEF]",
SummarizeParsedFormat(ParsedFormat<'v'>("ABC%vDEF")));
EXPECT_EQ("{v:1$v}[FFF]{v:2$v}[ZZZ]{f:3$f}",
SummarizeParsedFormat(ParsedFormat<'v', 'v', 'f'>("%vFFF%vZZZ%f")));
EXPECT_EQ("{v:1$v}[ ]{.*d:3$.2$*d}",
SummarizeParsedFormat(ParsedFormat<'v', '*', 'd'>("%v %.*d")));
}
TEST_F(ParsedFormatTest, SimpleUncheckedCorrect) {
auto f = ParsedFormat<'d'>::New("ABC%dDEF");
ASSERT_TRUE(f);
EXPECT_EQ("[ABC]{d:1$d}[DEF]", SummarizeParsedFormat(*f));
std::string format = "%sFFF%dZZZ%f";
auto f2 = ParsedFormat<'s', 'd', 'f'>::New(format);
ASSERT_TRUE(f2);
EXPECT_EQ("{s:1$s}[FFF]{d:2$d}[ZZZ]{f:3$f}", SummarizeParsedFormat(*f2));
f2 = ParsedFormat<'s', 'd', 'f'>::New("%s %d %f");
ASSERT_TRUE(f2);
EXPECT_EQ("{s:1$s}[ ]{d:2$d}[ ]{f:3$f}", SummarizeParsedFormat(*f2));
auto star = ParsedFormat<'*', 'd'>::New("%*d");
ASSERT_TRUE(star);
EXPECT_EQ("{*d:2$1$*d}", SummarizeParsedFormat(*star));
auto dollar = ParsedFormat<'d', 's'>::New("%2$s %1$d");
ASSERT_TRUE(dollar);
EXPECT_EQ("{2$s:2$s}[ ]{1$d:1$d}", SummarizeParsedFormat(*dollar));
// with reuse
dollar = ParsedFormat<'d', 's'>::New("%2$s %1$d %1$d");
ASSERT_TRUE(dollar);
EXPECT_EQ("{2$s:2$s}[ ]{1$d:1$d}[ ]{1$d:1$d}",
SummarizeParsedFormat(*dollar));
}
TEST_F(ParsedFormatTest, SimpleUncheckedCorrectWithV) {
auto f = ParsedFormat<'v'>::New("ABC%vDEF");
ASSERT_TRUE(f);
EXPECT_EQ("[ABC]{v:1$v}[DEF]", SummarizeParsedFormat(*f));
std::string format = "%vFFF%vZZZ%f";
auto f2 = ParsedFormat<'v', 'v', 'f'>::New(format);
ASSERT_TRUE(f2);
EXPECT_EQ("{v:1$v}[FFF]{v:2$v}[ZZZ]{f:3$f}", SummarizeParsedFormat(*f2));
f2 = ParsedFormat<'v', 'v', 'f'>::New("%v %v %f");
ASSERT_TRUE(f2);
EXPECT_EQ("{v:1$v}[ ]{v:2$v}[ ]{f:3$f}", SummarizeParsedFormat(*f2));
}
TEST_F(ParsedFormatTest, SimpleUncheckedIgnoredArgs) {
EXPECT_FALSE((ParsedFormat<'d', 's'>::New("ABC")));
EXPECT_FALSE((ParsedFormat<'d', 's'>::New("%dABC")));
EXPECT_FALSE((ParsedFormat<'d', 's'>::New("ABC%2$s")));
auto f = ParsedFormat<'d', 's'>::NewAllowIgnored("ABC");
ASSERT_TRUE(f);
EXPECT_EQ("[ABC]", SummarizeParsedFormat(*f));
f = ParsedFormat<'d', 's'>::NewAllowIgnored("%dABC");
ASSERT_TRUE(f);
EXPECT_EQ("{d:1$d}[ABC]", SummarizeParsedFormat(*f));
f = ParsedFormat<'d', 's'>::NewAllowIgnored("ABC%2$s");
ASSERT_TRUE(f);
EXPECT_EQ("[ABC]{2$s:2$s}", SummarizeParsedFormat(*f));
}
TEST_F(ParsedFormatTest, SimpleUncheckedIgnoredArgsWithV) {
EXPECT_FALSE((ParsedFormat<'v', 'v'>::New("ABC")));
EXPECT_FALSE((ParsedFormat<'v', 'v'>::New("%vABC")));
EXPECT_FALSE((ParsedFormat<'v', 's'>::New("ABC%2$s")));
auto f = ParsedFormat<'v', 'v'>::NewAllowIgnored("ABC");
ASSERT_TRUE(f);
EXPECT_EQ("[ABC]", SummarizeParsedFormat(*f));
f = ParsedFormat<'v', 'v'>::NewAllowIgnored("%vABC");
ASSERT_TRUE(f);
EXPECT_EQ("{v:1$v}[ABC]", SummarizeParsedFormat(*f));
}
TEST_F(ParsedFormatTest, SimpleUncheckedUnsupported) {
EXPECT_FALSE(ParsedFormat<'d'>::New("%1$d %1$x"));
EXPECT_FALSE(ParsedFormat<'x'>::New("%1$d %1$x"));
}
TEST_F(ParsedFormatTest, SimpleUncheckedIncorrect) {
EXPECT_FALSE(ParsedFormat<'d'>::New(""));
EXPECT_FALSE(ParsedFormat<'d'>::New("ABC%dDEF%d"));
std::string format = "%sFFF%dZZZ%f";
EXPECT_FALSE((ParsedFormat<'s', 'd', 'g'>::New(format)));
}
TEST_F(ParsedFormatTest, SimpleUncheckedIncorrectWithV) {
EXPECT_FALSE(ParsedFormat<'v'>::New(""));
EXPECT_FALSE(ParsedFormat<'v'>::New("ABC%vDEF%v"));
std::string format = "%vFFF%vZZZ%f";
EXPECT_FALSE((ParsedFormat<'v', 'v', 'g'>::New(format)));
}
#if defined(__cpp_nontype_template_parameter_auto)
template <auto T>
std::true_type IsValidParsedFormatArgTest(ParsedFormat<T>*);
template <auto T>
std::false_type IsValidParsedFormatArgTest(...);
template <auto T>
using IsValidParsedFormatArg = decltype(IsValidParsedFormatArgTest<T>(nullptr));
TEST_F(ParsedFormatTest, OnlyValidTypesAllowed) {
ASSERT_TRUE(IsValidParsedFormatArg<'c'>::value);
ASSERT_TRUE(IsValidParsedFormatArg<FormatConversionCharSet::d>::value);
ASSERT_TRUE(IsValidParsedFormatArg<absl::FormatConversionCharSet::d |
absl::FormatConversionCharSet::x>::value);
ASSERT_TRUE(
IsValidParsedFormatArg<absl::FormatConversionCharSet::kIntegral>::value);
// This is an easy mistake to make, however, this will reduce to an integer
// which has no meaning, so we need to ensure it doesn't compile.
ASSERT_FALSE(IsValidParsedFormatArg<'x' | 'd'>::value);
// For now, we disallow construction based on ConversionChar (rather than
// CharSet)
ASSERT_FALSE(IsValidParsedFormatArg<absl::FormatConversionChar::d>::value);
}
TEST_F(ParsedFormatTest, ExtendedTyping) {
EXPECT_FALSE(ParsedFormat<FormatConversionCharSet::d>::New(""));
ASSERT_TRUE(ParsedFormat<absl::FormatConversionCharSet::d>::New("%d"));
auto v1 = ParsedFormat<'d', absl::FormatConversionCharSet::s>::New("%d%s");
ASSERT_TRUE(v1);
auto v2 = ParsedFormat<absl::FormatConversionCharSet::d, 's'>::New("%d%s");
ASSERT_TRUE(v2);
auto v3 = ParsedFormat<absl::FormatConversionCharSet::d |
absl::FormatConversionCharSet::s,
's'>::New("%d%s");
ASSERT_TRUE(v3);
auto v4 = ParsedFormat<absl::FormatConversionCharSet::d |
absl::FormatConversionCharSet::s,
's'>::New("%s%s");
ASSERT_TRUE(v4);
}
TEST_F(ParsedFormatTest, ExtendedTypingWithV) {
EXPECT_FALSE(ParsedFormat<FormatConversionCharSet::v>::New(""));
ASSERT_TRUE(ParsedFormat<absl::FormatConversionCharSet::v>::New("%v"));
auto v1 = ParsedFormat<'v', absl::FormatConversionCharSet::v>::New("%v%v");
ASSERT_TRUE(v1);
auto v2 = ParsedFormat<absl::FormatConversionCharSet::v, 'v'>::New("%v%v");
ASSERT_TRUE(v2);
auto v3 = ParsedFormat<absl::FormatConversionCharSet::v |
absl::FormatConversionCharSet::v,
'v'>::New("%v%v");
ASSERT_TRUE(v3);
auto v4 = ParsedFormat<absl::FormatConversionCharSet::v |
absl::FormatConversionCharSet::v,
'v'>::New("%v%v");
ASSERT_TRUE(v4);
}
#endif
TEST_F(ParsedFormatTest, UncheckedCorrect) {
auto f =
ExtendedParsedFormat<absl::FormatConversionCharSet::d>::New("ABC%dDEF");
ASSERT_TRUE(f);
EXPECT_EQ("[ABC]{d:1$d}[DEF]", SummarizeParsedFormat(*f));
std::string format = "%sFFF%dZZZ%f";
auto f2 = ExtendedParsedFormat<
absl::FormatConversionCharSet::kString, absl::FormatConversionCharSet::d,
absl::FormatConversionCharSet::kFloating>::New(format);
ASSERT_TRUE(f2);
EXPECT_EQ("{s:1$s}[FFF]{d:2$d}[ZZZ]{f:3$f}", SummarizeParsedFormat(*f2));
f2 = ExtendedParsedFormat<
absl::FormatConversionCharSet::kString, absl::FormatConversionCharSet::d,
absl::FormatConversionCharSet::kFloating>::New("%s %d %f");
ASSERT_TRUE(f2);
EXPECT_EQ("{s:1$s}[ ]{d:2$d}[ ]{f:3$f}", SummarizeParsedFormat(*f2));
auto star =
ExtendedParsedFormat<absl::FormatConversionCharSet::kStar,
absl::FormatConversionCharSet::d>::New("%*d");
ASSERT_TRUE(star);
EXPECT_EQ("{*d:2$1$*d}", SummarizeParsedFormat(*star));
auto dollar =
ExtendedParsedFormat<absl::FormatConversionCharSet::d,
absl::FormatConversionCharSet::s>::New("%2$s %1$d");
ASSERT_TRUE(dollar);
EXPECT_EQ("{2$s:2$s}[ ]{1$d:1$d}", SummarizeParsedFormat(*dollar));
// with reuse
dollar = ExtendedParsedFormat<
absl::FormatConversionCharSet::d,
absl::FormatConversionCharSet::s>::New("%2$s %1$d %1$d");
ASSERT_TRUE(dollar);
EXPECT_EQ("{2$s:2$s}[ ]{1$d:1$d}[ ]{1$d:1$d}",
SummarizeParsedFormat(*dollar));
}
TEST_F(ParsedFormatTest, UncheckedCorrectWithV) {
auto f =
ExtendedParsedFormat<absl::FormatConversionCharSet::v>::New("ABC%vDEF");
ASSERT_TRUE(f);
EXPECT_EQ("[ABC]{v:1$v}[DEF]", SummarizeParsedFormat(*f));
std::string format = "%vFFF%vZZZ%f";
auto f2 = ExtendedParsedFormat<
absl::FormatConversionCharSet::v, absl::FormatConversionCharSet::v,
absl::FormatConversionCharSet::kFloating>::New(format);
ASSERT_TRUE(f2);
EXPECT_EQ("{v:1$v}[FFF]{v:2$v}[ZZZ]{f:3$f}", SummarizeParsedFormat(*f2));
f2 = ExtendedParsedFormat<
absl::FormatConversionCharSet::v, absl::FormatConversionCharSet::v,
absl::FormatConversionCharSet::kFloating>::New("%v %v %f");
ASSERT_TRUE(f2);
EXPECT_EQ("{v:1$v}[ ]{v:2$v}[ ]{f:3$f}", SummarizeParsedFormat(*f2));
}
TEST_F(ParsedFormatTest, UncheckedIgnoredArgs) {
EXPECT_FALSE(
(ExtendedParsedFormat<absl::FormatConversionCharSet::d,
absl::FormatConversionCharSet::s>::New("ABC")));
EXPECT_FALSE(
(ExtendedParsedFormat<absl::FormatConversionCharSet::d,
absl::FormatConversionCharSet::s>::New("%dABC")));
EXPECT_FALSE(
(ExtendedParsedFormat<absl::FormatConversionCharSet::d,
absl::FormatConversionCharSet::s>::New("ABC%2$s")));
auto f = ExtendedParsedFormat<
absl::FormatConversionCharSet::d,
absl::FormatConversionCharSet::s>::NewAllowIgnored("ABC");
ASSERT_TRUE(f);
EXPECT_EQ("[ABC]", SummarizeParsedFormat(*f));
f = ExtendedParsedFormat<
absl::FormatConversionCharSet::d,
absl::FormatConversionCharSet::s>::NewAllowIgnored("%dABC");
ASSERT_TRUE(f);
EXPECT_EQ("{d:1$d}[ABC]", SummarizeParsedFormat(*f));
f = ExtendedParsedFormat<
absl::FormatConversionCharSet::d,
absl::FormatConversionCharSet::s>::NewAllowIgnored("ABC%2$s");
ASSERT_TRUE(f);
EXPECT_EQ("[ABC]{2$s:2$s}", SummarizeParsedFormat(*f));
}
TEST_F(ParsedFormatTest, UncheckedIgnoredArgsWithV) {
EXPECT_FALSE(
(ExtendedParsedFormat<absl::FormatConversionCharSet::v,
absl::FormatConversionCharSet::v>::New("ABC")));
EXPECT_FALSE(
(ExtendedParsedFormat<absl::FormatConversionCharSet::v,
absl::FormatConversionCharSet::v>::New("%vABC")));
EXPECT_FALSE((ExtendedParsedFormat<absl::FormatConversionCharSet::v,
absl::FormatConversionCharSet::s>::
New("ABC%2$s")));
auto f = ExtendedParsedFormat<
absl::FormatConversionCharSet::v,
absl::FormatConversionCharSet::v>::NewAllowIgnored("ABC");
ASSERT_TRUE(f);
EXPECT_EQ("[ABC]", SummarizeParsedFormat(*f));
f = ExtendedParsedFormat<
absl::FormatConversionCharSet::v,
absl::FormatConversionCharSet::v>::NewAllowIgnored("%vABC");
ASSERT_TRUE(f);
EXPECT_EQ("{v:1$v}[ABC]", SummarizeParsedFormat(*f));
}
TEST_F(ParsedFormatTest, UncheckedMultipleTypes) {
auto dx =
ExtendedParsedFormat<absl::FormatConversionCharSet::d |
absl::FormatConversionCharSet::x>::New("%1$d %1$x");
EXPECT_TRUE(dx);
EXPECT_EQ("{1$d:1$d}[ ]{1$x:1$x}", SummarizeParsedFormat(*dx));
dx = ExtendedParsedFormat<absl::FormatConversionCharSet::d |
absl::FormatConversionCharSet::x>::New("%1$d");
EXPECT_TRUE(dx);
EXPECT_EQ("{1$d:1$d}", SummarizeParsedFormat(*dx));
}
TEST_F(ParsedFormatTest, UncheckedIncorrect) {
EXPECT_FALSE(ExtendedParsedFormat<absl::FormatConversionCharSet::d>::New(""));
EXPECT_FALSE(ExtendedParsedFormat<absl::FormatConversionCharSet::d>::New(
"ABC%dDEF%d"));
std::string format = "%sFFF%dZZZ%f";
EXPECT_FALSE(
(ExtendedParsedFormat<absl::FormatConversionCharSet::s,
absl::FormatConversionCharSet::d,
absl::FormatConversionCharSet::g>::New(format)));
}
TEST_F(ParsedFormatTest, UncheckedIncorrectWithV) {
EXPECT_FALSE(ExtendedParsedFormat<absl::FormatConversionCharSet::v>::New(""));
EXPECT_FALSE(ExtendedParsedFormat<absl::FormatConversionCharSet::v>::New(
"ABC%vDEF%v"));
std::string format = "%vFFF%vZZZ%f";
EXPECT_FALSE(
(ExtendedParsedFormat<absl::FormatConversionCharSet::v,
absl::FormatConversionCharSet::g>::New(format)));
}
TEST_F(ParsedFormatTest, RegressionMixPositional) {
EXPECT_FALSE(
(ExtendedParsedFormat<absl::FormatConversionCharSet::d,
absl::FormatConversionCharSet::o>::New("%1$d %o")));
}
TEST_F(ParsedFormatTest, DisallowModifiersWithV) {
auto f = ParsedFormat<'v'>::New("ABC%80vDEF");
EXPECT_EQ(f, nullptr);
f = ParsedFormat<'v'>::New("ABC%0vDEF");
EXPECT_EQ(f, nullptr);
f = ParsedFormat<'v'>::New("ABC%.1vDEF");
EXPECT_EQ(f, nullptr);
}
using FormatWrapperTest = ::testing::Test;
// Plain wrapper for StrFormat.
template <typename... Args>
std::string WrappedFormat(const absl::FormatSpec<Args...>& format,
const Args&... args) {
return StrFormat(format, args...);
}
TEST_F(FormatWrapperTest, ConstexprStringFormat) {
EXPECT_EQ(WrappedFormat("%s there", "hello"), "hello there");
}
TEST_F(FormatWrapperTest, ConstexprStringFormatWithV) {
std::string hello = "hello";
EXPECT_EQ(WrappedFormat("%v there", hello), "hello there");
}
TEST_F(FormatWrapperTest, ParsedFormat) {
ParsedFormat<'s'> format("%s there");
EXPECT_EQ(WrappedFormat(format, "hello"), "hello there");
}
TEST_F(FormatWrapperTest, ParsedFormatWithV) {
std::string hello = "hello";
ParsedFormat<'v'> format("%v there");
EXPECT_EQ(WrappedFormat(format, hello), "hello there");
}
} // namespace
ABSL_NAMESPACE_END
} // namespace absl
namespace {
using FormatExtensionTest = ::testing::Test;
struct Point {
friend absl::FormatConvertResult<absl::FormatConversionCharSet::kString |
absl::FormatConversionCharSet::kIntegral |
absl::FormatConversionCharSet::v>
AbslFormatConvert(const Point& p, const absl::FormatConversionSpec& spec,
absl::FormatSink* s) {
if (spec.conversion_char() == absl::FormatConversionChar::s) {
s->Append(absl::StrCat("x=", p.x, " y=", p.y));
} else {
s->Append(absl::StrCat(p.x, ",", p.y));
}
return {true};
}
int x = 10;
int y = 20;
};
TEST_F(FormatExtensionTest, AbslFormatConvertExample) {
Point p;
EXPECT_EQ(absl::StrFormat("a %s z", p), "a x=10 y=20 z");
EXPECT_EQ(absl::StrFormat("a %d z", p), "a 10,20 z");
EXPECT_EQ(absl::StrFormat("a %v z", p), "a 10,20 z");
// Typed formatting will fail to compile an invalid format.
// StrFormat("%f", p); // Does not compile.
std::string actual;
absl::UntypedFormatSpec f1("%f");
// FormatUntyped will return false for bad character.
EXPECT_FALSE(absl::FormatUntyped(&actual, f1, {absl::FormatArg(p)}));
}
struct PointStringify {
template <typename FormatSink>
friend void AbslStringify(FormatSink& sink, const PointStringify& p) {
sink.Append(absl::StrCat("(", p.x, ", ", p.y, ")"));
}
double x = 10.0;
double y = 20.0;
};
TEST_F(FormatExtensionTest, AbslStringifyExample) {
PointStringify p;
EXPECT_EQ(absl::StrFormat("a %v z", p), "a (10, 20) z");
}
struct PointStringifyUsingFormat {
template <typename FormatSink>
friend void AbslStringify(FormatSink& sink,
const PointStringifyUsingFormat& p) {
absl::Format(&sink, "(%g, %g)", p.x, p.y);
}
double x = 10.0;
double y = 20.0;
};
TEST_F(FormatExtensionTest, AbslStringifyExampleUsingFormat) {
PointStringifyUsingFormat p;
EXPECT_EQ(absl::StrFormat("a %v z", p), "a (10, 20) z");
}
} // namespace
// Some codegen thunks that we can use to easily dump the generated assembly for
// different StrFormat calls.
std::string CodegenAbslStrFormatInt(int i) { // NOLINT
return absl::StrFormat("%d", i);
}
std::string CodegenAbslStrFormatIntStringInt64(int i, const std::string& s,
int64_t i64) { // NOLINT
return absl::StrFormat("%d %s %d", i, s, i64);
}
void CodegenAbslStrAppendFormatInt(std::string* out, int i) { // NOLINT
absl::StrAppendFormat(out, "%d", i);
}
void CodegenAbslStrAppendFormatIntStringInt64(std::string* out, int i,
const std::string& s,
int64_t i64) { // NOLINT
absl::StrAppendFormat(out, "%d %s %d", i, s, i64);
}