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abseil-cpp/absl/strings/str_cat_test.cc

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// Copyright 2017 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
//
// http://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.
// Unit tests for all str_cat.h functions
#include "absl/strings/str_cat.h"
#include <cstdint>
#include <string>
#include "gtest/gtest.h"
#include "absl/strings/substitute.h"
namespace {
// Test absl::StrCat of ints and longs of various sizes and signdedness.
TEST(StrCat, Ints) {
const short s = -1; // NOLINT(runtime/int)
const uint16_t us = 2;
const int i = -3;
const unsigned int ui = 4;
const long l = -5; // NOLINT(runtime/int)
const unsigned long ul = 6; // NOLINT(runtime/int)
const long long ll = -7; // NOLINT(runtime/int)
const unsigned long long ull = 8; // NOLINT(runtime/int)
const ptrdiff_t ptrdiff = -9;
const size_t size = 10;
const intptr_t intptr = -12;
const uintptr_t uintptr = 13;
std::string answer;
answer = absl::StrCat(s, us);
EXPECT_EQ(answer, "-12");
answer = absl::StrCat(i, ui);
EXPECT_EQ(answer, "-34");
answer = absl::StrCat(l, ul);
EXPECT_EQ(answer, "-56");
answer = absl::StrCat(ll, ull);
EXPECT_EQ(answer, "-78");
answer = absl::StrCat(ptrdiff, size);
EXPECT_EQ(answer, "-910");
answer = absl::StrCat(ptrdiff, intptr);
EXPECT_EQ(answer, "-9-12");
answer = absl::StrCat(uintptr, 0);
EXPECT_EQ(answer, "130");
}
TEST(StrCat, Enums) {
enum SmallNumbers { One = 1, Ten = 10 } e = Ten;
EXPECT_EQ("10", absl::StrCat(e));
EXPECT_EQ("-5", absl::StrCat(SmallNumbers(-5)));
enum class Option { Boxers = 1, Briefs = -1 };
EXPECT_EQ("-1", absl::StrCat(Option::Briefs));
enum class Airplane : uint64_t {
Airbus = 1,
Boeing = 1000,
Canary = 10000000000 // too big for "int"
};
EXPECT_EQ("10000000000", absl::StrCat(Airplane::Canary));
enum class TwoGig : int32_t {
TwoToTheZero = 1,
TwoToTheSixteenth = 1 << 16,
TwoToTheThirtyFirst = INT32_MIN
};
EXPECT_EQ("65536", absl::StrCat(TwoGig::TwoToTheSixteenth));
EXPECT_EQ("-2147483648", absl::StrCat(TwoGig::TwoToTheThirtyFirst));
EXPECT_EQ("-1", absl::StrCat(static_cast<TwoGig>(-1)));
enum class FourGig : uint32_t {
TwoToTheZero = 1,
TwoToTheSixteenth = 1 << 16,
TwoToTheThirtyFirst = 1U << 31 // too big for "int"
};
EXPECT_EQ("65536", absl::StrCat(FourGig::TwoToTheSixteenth));
EXPECT_EQ("2147483648", absl::StrCat(FourGig::TwoToTheThirtyFirst));
EXPECT_EQ("4294967295", absl::StrCat(static_cast<FourGig>(-1)));
EXPECT_EQ("10000000000", absl::StrCat(Airplane::Canary));
}
TEST(StrCat, Basics) {
std::string result;
std::string strs[] = {
"Hello",
"Cruel",
"World"
};
std::string stdstrs[] = {
"std::Hello",
"std::Cruel",
"std::World"
};
absl::string_view pieces[] = {"Hello", "Cruel", "World"};
const char* c_strs[] = {
"Hello",
"Cruel",
"World"
};
int32_t i32s[] = {'H', 'C', 'W'};
uint64_t ui64s[] = {12345678910LL, 10987654321LL};
EXPECT_EQ(absl::StrCat(), "");
result = absl::StrCat(false, true, 2, 3);
EXPECT_EQ(result, "0123");
result = absl::StrCat(-1);
EXPECT_EQ(result, "-1");
result = absl::StrCat(absl::SixDigits(0.5));
EXPECT_EQ(result, "0.5");
result = absl::StrCat(strs[1], pieces[2]);
EXPECT_EQ(result, "CruelWorld");
result = absl::StrCat(stdstrs[1], " ", stdstrs[2]);
EXPECT_EQ(result, "std::Cruel std::World");
result = absl::StrCat(strs[0], ", ", pieces[2]);
EXPECT_EQ(result, "Hello, World");
result = absl::StrCat(strs[0], ", ", strs[1], " ", strs[2], "!");
EXPECT_EQ(result, "Hello, Cruel World!");
result = absl::StrCat(pieces[0], ", ", pieces[1], " ", pieces[2]);
EXPECT_EQ(result, "Hello, Cruel World");
result = absl::StrCat(c_strs[0], ", ", c_strs[1], " ", c_strs[2]);
EXPECT_EQ(result, "Hello, Cruel World");
result = absl::StrCat("ASCII ", i32s[0], ", ", i32s[1], " ", i32s[2], "!");
EXPECT_EQ(result, "ASCII 72, 67 87!");
result = absl::StrCat(ui64s[0], ", ", ui64s[1], "!");
EXPECT_EQ(result, "12345678910, 10987654321!");
std::string one = "1"; // Actually, it's the size of this std::string that we want; a
// 64-bit build distinguishes between size_t and uint64_t,
// even though they're both unsigned 64-bit values.
result = absl::StrCat("And a ", one.size(), " and a ",
&result[2] - &result[0], " and a ", one, " 2 3 4", "!");
EXPECT_EQ(result, "And a 1 and a 2 and a 1 2 3 4!");
// result = absl::StrCat("Single chars won't compile", '!');
// result = absl::StrCat("Neither will nullptrs", nullptr);
result =
absl::StrCat("To output a char by ASCII/numeric value, use +: ", '!' + 0);
EXPECT_EQ(result, "To output a char by ASCII/numeric value, use +: 33");
float f = 100000.5;
result = absl::StrCat("A hundred K and a half is ", absl::SixDigits(f));
EXPECT_EQ(result, "A hundred K and a half is 100000");
f = 100001.5;
result =
absl::StrCat("A hundred K and one and a half is ", absl::SixDigits(f));
EXPECT_EQ(result, "A hundred K and one and a half is 100002");
double d = 100000.5;
d *= d;
result =
absl::StrCat("A hundred K and a half squared is ", absl::SixDigits(d));
EXPECT_EQ(result, "A hundred K and a half squared is 1.00001e+10");
result = absl::StrCat(1, 2, 333, 4444, 55555, 666666, 7777777, 88888888,
999999999);
EXPECT_EQ(result, "12333444455555666666777777788888888999999999");
}
// A minimal allocator that uses malloc().
template <typename T>
struct Mallocator {
typedef T value_type;
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef T* pointer;
typedef const T* const_pointer;
typedef T& reference;
typedef const T& const_reference;
size_type max_size() const {
return size_t(std::numeric_limits<size_type>::max()) / sizeof(value_type);
}
template <typename U>
struct rebind {
typedef Mallocator<U> other;
};
Mallocator() = default;
T* allocate(size_t n) { return static_cast<T*>(std::malloc(n * sizeof(T))); }
void deallocate(T* p, size_t) { std::free(p); }
};
template <typename T, typename U>
bool operator==(const Mallocator<T>&, const Mallocator<U>&) {
return true;
}
template <typename T, typename U>
bool operator!=(const Mallocator<T>&, const Mallocator<U>&) {
return false;
}
TEST(StrCat, CustomAllocator) {
using mstring =
std::basic_string<char, std::char_traits<char>, Mallocator<char>>;
const mstring str1("PARACHUTE OFF A BLIMP INTO MOSCONE!!");
const mstring str2("Read this book about coffee tables");
std::string result = absl::StrCat(str1, str2);
EXPECT_EQ(result,
"PARACHUTE OFF A BLIMP INTO MOSCONE!!"
"Read this book about coffee tables");
}
TEST(StrCat, MaxArgs) {
std::string result;
// Test 10 up to 26 arguments, the current maximum
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a");
EXPECT_EQ(result, "123456789a");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b");
EXPECT_EQ(result, "123456789ab");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c");
EXPECT_EQ(result, "123456789abc");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d");
EXPECT_EQ(result, "123456789abcd");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e");
EXPECT_EQ(result, "123456789abcde");
result =
absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f");
EXPECT_EQ(result, "123456789abcdef");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
"g");
EXPECT_EQ(result, "123456789abcdefg");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
"g", "h");
EXPECT_EQ(result, "123456789abcdefgh");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
"g", "h", "i");
EXPECT_EQ(result, "123456789abcdefghi");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
"g", "h", "i", "j");
EXPECT_EQ(result, "123456789abcdefghij");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
"g", "h", "i", "j", "k");
EXPECT_EQ(result, "123456789abcdefghijk");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
"g", "h", "i", "j", "k", "l");
EXPECT_EQ(result, "123456789abcdefghijkl");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
"g", "h", "i", "j", "k", "l", "m");
EXPECT_EQ(result, "123456789abcdefghijklm");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
"g", "h", "i", "j", "k", "l", "m", "n");
EXPECT_EQ(result, "123456789abcdefghijklmn");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
"g", "h", "i", "j", "k", "l", "m", "n", "o");
EXPECT_EQ(result, "123456789abcdefghijklmno");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
"g", "h", "i", "j", "k", "l", "m", "n", "o", "p");
EXPECT_EQ(result, "123456789abcdefghijklmnop");
result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b", "c", "d", "e", "f",
"g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q");
EXPECT_EQ(result, "123456789abcdefghijklmnopq");
// No limit thanks to C++11's variadic templates
result = absl::StrCat(
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, "a", "b", "c", "d", "e", "f", "g", "h",
"i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w",
"x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L",
"M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z");
EXPECT_EQ(result,
"12345678910abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
}
TEST(StrAppend, Basics) {
std::string result = "existing text";
std::string strs[] = {
"Hello",
"Cruel",
"World"
};
std::string stdstrs[] = {
"std::Hello",
"std::Cruel",
"std::World"
};
absl::string_view pieces[] = {"Hello", "Cruel", "World"};
const char* c_strs[] = {
"Hello",
"Cruel",
"World"
};
int32_t i32s[] = {'H', 'C', 'W'};
uint64_t ui64s[] = {12345678910LL, 10987654321LL};
std::string::size_type old_size = result.size();
absl::StrAppend(&result);
EXPECT_EQ(result.size(), old_size);
old_size = result.size();
absl::StrAppend(&result, strs[0]);
EXPECT_EQ(result.substr(old_size), "Hello");
old_size = result.size();
absl::StrAppend(&result, strs[1], pieces[2]);
EXPECT_EQ(result.substr(old_size), "CruelWorld");
old_size = result.size();
absl::StrAppend(&result, stdstrs[0], ", ", pieces[2]);
EXPECT_EQ(result.substr(old_size), "std::Hello, World");
old_size = result.size();
absl::StrAppend(&result, strs[0], ", ", stdstrs[1], " ", strs[2], "!");
EXPECT_EQ(result.substr(old_size), "Hello, std::Cruel World!");
old_size = result.size();
absl::StrAppend(&result, pieces[0], ", ", pieces[1], " ", pieces[2]);
EXPECT_EQ(result.substr(old_size), "Hello, Cruel World");
old_size = result.size();
absl::StrAppend(&result, c_strs[0], ", ", c_strs[1], " ", c_strs[2]);
EXPECT_EQ(result.substr(old_size), "Hello, Cruel World");
old_size = result.size();
absl::StrAppend(&result, "ASCII ", i32s[0], ", ", i32s[1], " ", i32s[2], "!");
EXPECT_EQ(result.substr(old_size), "ASCII 72, 67 87!");
old_size = result.size();
absl::StrAppend(&result, ui64s[0], ", ", ui64s[1], "!");
EXPECT_EQ(result.substr(old_size), "12345678910, 10987654321!");
std::string one = "1"; // Actually, it's the size of this std::string that we want; a
// 64-bit build distinguishes between size_t and uint64_t,
// even though they're both unsigned 64-bit values.
old_size = result.size();
absl::StrAppend(&result, "And a ", one.size(), " and a ",
&result[2] - &result[0], " and a ", one, " 2 3 4", "!");
EXPECT_EQ(result.substr(old_size), "And a 1 and a 2 and a 1 2 3 4!");
// result = absl::StrCat("Single chars won't compile", '!');
// result = absl::StrCat("Neither will nullptrs", nullptr);
old_size = result.size();
absl::StrAppend(&result,
"To output a char by ASCII/numeric value, use +: ", '!' + 0);
EXPECT_EQ(result.substr(old_size),
"To output a char by ASCII/numeric value, use +: 33");
// Test 9 arguments, the old maximum
old_size = result.size();
absl::StrAppend(&result, 1, 22, 333, 4444, 55555, 666666, 7777777, 88888888,
9);
EXPECT_EQ(result.substr(old_size), "1223334444555556666667777777888888889");
// No limit thanks to C++11's variadic templates
old_size = result.size();
absl::StrAppend(
&result, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, //
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", //
"n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", //
"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", //
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", //
"No limit thanks to C++11's variadic templates");
EXPECT_EQ(result.substr(old_size),
"12345678910abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
"No limit thanks to C++11's variadic templates");
}
#ifdef GTEST_HAS_DEATH_TEST
TEST(StrAppend, Death) {
std::string s = "self";
// on linux it's "assertion", on mac it's "Assertion",
// on chromiumos it's "Assertion ... failed".
EXPECT_DEBUG_DEATH(absl::StrAppend(&s, s.c_str() + 1), "ssertion.*failed");
EXPECT_DEBUG_DEATH(absl::StrAppend(&s, s), "ssertion.*failed");
}
#endif // GTEST_HAS_DEATH_TEST
TEST(StrAppend, EmptyString) {
std::string s = "";
absl::StrAppend(&s, s);
EXPECT_EQ(s, "");
}
template <typename IntType>
void CheckHex(IntType v, const char* nopad_format, const char* zeropad_format,
const char* spacepad_format) {
char expected[256];
std::string actual = absl::StrCat(absl::Hex(v, absl::kNoPad));
snprintf(expected, sizeof(expected), nopad_format, v);
EXPECT_EQ(expected, actual) << " decimal value " << v;
for (int spec = absl::kZeroPad2; spec <= absl::kZeroPad16; ++spec) {
std::string actual =
absl::StrCat(absl::Hex(v, static_cast<absl::PadSpec>(spec)));
snprintf(expected, sizeof(expected), zeropad_format,
spec - absl::kZeroPad2 + 2, v);
EXPECT_EQ(expected, actual) << " decimal value " << v;
}
for (int spec = absl::kSpacePad2; spec <= absl::kSpacePad16; ++spec) {
std::string actual =
absl::StrCat(absl::Hex(v, static_cast<absl::PadSpec>(spec)));
snprintf(expected, sizeof(expected), spacepad_format,
spec - absl::kSpacePad2 + 2, v);
EXPECT_EQ(expected, actual) << " decimal value " << v;
}
}
template <typename IntType>
void CheckDec(IntType v, const char* nopad_format, const char* zeropad_format,
const char* spacepad_format) {
char expected[256];
std::string actual = absl::StrCat(absl::Dec(v, absl::kNoPad));
snprintf(expected, sizeof(expected), nopad_format, v);
EXPECT_EQ(expected, actual) << " decimal value " << v;
for (int spec = absl::kZeroPad2; spec <= absl::kZeroPad16; ++spec) {
std::string actual =
absl::StrCat(absl::Dec(v, static_cast<absl::PadSpec>(spec)));
snprintf(expected, sizeof(expected), zeropad_format,
spec - absl::kZeroPad2 + 2, v);
EXPECT_EQ(expected, actual)
<< " decimal value " << v << " format '" << zeropad_format
<< "' digits " << (spec - absl::kZeroPad2 + 2);
}
for (int spec = absl::kSpacePad2; spec <= absl::kSpacePad16; ++spec) {
std::string actual =
absl::StrCat(absl::Dec(v, static_cast<absl::PadSpec>(spec)));
snprintf(expected, sizeof(expected), spacepad_format,
spec - absl::kSpacePad2 + 2, v);
EXPECT_EQ(expected, actual)
<< " decimal value " << v << " format '" << spacepad_format
<< "' digits " << (spec - absl::kSpacePad2 + 2);
}
}
void CheckHexDec64(uint64_t v) {
unsigned long long ullv = v; // NOLINT(runtime/int)
CheckHex(ullv, "%llx", "%0*llx", "%*llx");
CheckDec(ullv, "%llu", "%0*llu", "%*llu");
long long llv = static_cast<long long>(ullv); // NOLINT(runtime/int)
CheckDec(llv, "%lld", "%0*lld", "%*lld");
}
void CheckHexDec32(uint32_t uv) {
CheckHex(uv, "%x", "%0*x", "%*x");
CheckDec(uv, "%u", "%0*u", "%*u");
int32_t v = static_cast<int32_t>(uv);
CheckDec(v, "%d", "%0*d", "%*d");
}
void CheckAll(uint64_t v) {
CheckHexDec64(v);
CheckHexDec32(static_cast<uint32_t>(v));
}
void TestFastPrints() {
// Test all small ints; there aren't many and they're common.
for (int i = 0; i < 10000; i++) {
CheckAll(i);
}
CheckAll(std::numeric_limits<uint64_t>::max());
CheckAll(std::numeric_limits<uint64_t>::max() - 1);
CheckAll(std::numeric_limits<int64_t>::min());
CheckAll(std::numeric_limits<int64_t>::min() + 1);
CheckAll(std::numeric_limits<uint32_t>::max());
CheckAll(std::numeric_limits<uint32_t>::max() - 1);
CheckAll(std::numeric_limits<int32_t>::min());
CheckAll(std::numeric_limits<int32_t>::min() + 1);
CheckAll(999999999); // fits in 32 bits
CheckAll(1000000000); // fits in 32 bits
CheckAll(9999999999); // doesn't fit in 32 bits
CheckAll(10000000000); // doesn't fit in 32 bits
CheckAll(999999999999999999); // fits in signed 64-bit
CheckAll(9999999999999999999u); // fits in unsigned 64-bit, but not signed.
CheckAll(1000000000000000000); // fits in signed 64-bit
CheckAll(10000000000000000000u); // fits in unsigned 64-bit, but not signed.
CheckAll(999999999876543210); // check all decimal digits, signed
CheckAll(9999999999876543210u); // check all decimal digits, unsigned.
CheckAll(0x123456789abcdef0); // check all hex digits
CheckAll(0x12345678);
int8_t minus_one_8bit = -1;
EXPECT_EQ("ff", absl::StrCat(absl::Hex(minus_one_8bit)));
int16_t minus_one_16bit = -1;
EXPECT_EQ("ffff", absl::StrCat(absl::Hex(minus_one_16bit)));
}
TEST(Numbers, TestFunctionsMovedOverFromNumbersMain) {
TestFastPrints();
}
} // namespace