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/*
* Copyright 2021 The Android Open Source Project
*
* 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.
*/
#include <ftl/string.h>
#include <gtest/gtest.h>
#include <algorithm>
#include <cstdint>
#include <iterator>
#include <limits>
#include <sstream>
#include <type_traits>
namespace android::test {
// Keep in sync with example usage in header file.
TEST(String, ToChars) {
ftl::to_chars_buffer_t<> buffer;
EXPECT_EQ(ftl::to_chars(buffer, 123u), "123");
EXPECT_EQ(ftl::to_chars(buffer, -42, ftl::Radix::kBin), "-0b101010");
EXPECT_EQ(ftl::to_chars(buffer, 0xcafe, ftl::Radix::kHex), "0xcafe");
EXPECT_EQ(ftl::to_chars(buffer, '*', ftl::Radix::kHex), "0x2a");
}
namespace {
template <typename F, typename T>
void ToCharsTest() {
constexpr auto kRadix = F::kRadix;
using Limits = std::numeric_limits<T>;
constexpr auto kMin = Limits::min();
constexpr auto kMax = Limits::max();
constexpr auto kNeg = static_cast<T>(-42);
constexpr auto kPos = static_cast<T>(123);
ftl::to_chars_buffer_t<T> buffer;
EXPECT_EQ(ftl::to_chars(buffer, kMin, kRadix), F{}(kMin));
EXPECT_EQ(ftl::to_chars(buffer, kMax, kRadix), F{}(kMax));
EXPECT_EQ(ftl::to_chars(buffer, kNeg, kRadix), F{}(kNeg));
EXPECT_EQ(ftl::to_chars(buffer, kPos, kRadix), F{}(kPos));
}
template <typename...>
struct Types {};
template <typename F, typename Types>
struct ToCharsTests;
template <typename F, typename T, typename... Ts>
struct ToCharsTests<F, Types<T, Ts...>> {
static void test() {
ToCharsTest<F, T>();
ToCharsTests<F, Types<Ts...>>::test();
}
};
template <typename F>
struct ToCharsTests<F, Types<>> {
static void test() {}
};
template <typename T, typename U = std::make_unsigned_t<T>>
U to_unsigned(std::ostream& stream, T v) {
if (std::is_same_v<T, U>) return v;
if (v < 0) {
stream << '-';
return std::numeric_limits<U>::max() - static_cast<U>(v) + 1;
} else {
return static_cast<U>(v);
}
}
struct Bin {
static constexpr auto kRadix = ftl::Radix::kBin;
template <typename T>
std::string operator()(T v) const {
std::ostringstream stream;
auto u = to_unsigned(stream, v);
stream << "0b";
if (u == 0) {
stream << 0;
} else {
std::ostringstream digits;
do {
digits << (u & 1);
} while (u >>= 1);
const auto str = digits.str();
std::copy(str.rbegin(), str.rend(), std::ostream_iterator<char>(stream));
}
return stream.str();
}
};
struct Dec {
static constexpr auto kRadix = ftl::Radix::kDec;
template <typename T>
std::string operator()(T v) const {
return std::to_string(v);
}
};
struct Hex {
static constexpr auto kRadix = ftl::Radix::kHex;
template <typename T>
std::string operator()(T v) const {
std::ostringstream stream;
const auto u = to_unsigned(stream, v);
stream << "0x" << std::hex << std::nouppercase;
stream << (sizeof(T) == 1 ? static_cast<unsigned>(u) : u);
return stream.str();
}
};
using IntegerTypes =
Types<char, unsigned char, signed char, std::uint8_t, std::uint16_t, std::uint32_t,
std::uint64_t, std::int8_t, std::int16_t, std::int32_t, std::int64_t>;
} // namespace
TEST(String, ToCharsBin) {
ToCharsTests<Bin, IntegerTypes>::test();
{
const std::uint8_t x = 0b1111'1111;
ftl::to_chars_buffer_t<decltype(x)> buffer;
EXPECT_EQ(ftl::to_chars(buffer, x, ftl::Radix::kBin), "0b11111111");
}
{
const std::int16_t x = -0b1000'0000'0000'0000;
ftl::to_chars_buffer_t<decltype(x)> buffer;
EXPECT_EQ(ftl::to_chars(buffer, x, ftl::Radix::kBin), "-0b1000000000000000");
}
}
TEST(String, ToCharsDec) {
ToCharsTests<Dec, IntegerTypes>::test();
{
const std::uint32_t x = UINT32_MAX;
ftl::to_chars_buffer_t<decltype(x)> buffer;
EXPECT_EQ(ftl::to_chars(buffer, x), "4294967295");
}
{
const std::int32_t x = INT32_MIN;
ftl::to_chars_buffer_t<decltype(x)> buffer;
EXPECT_EQ(ftl::to_chars(buffer, x), "-2147483648");
}
}
TEST(String, ToCharsHex) {
ToCharsTests<Hex, IntegerTypes>::test();
{
const std::uint16_t x = 0xfade;
ftl::to_chars_buffer_t<decltype(x)> buffer;
EXPECT_EQ(ftl::to_chars(buffer, x, ftl::Radix::kHex), "0xfade");
}
{
ftl::to_chars_buffer_t<> buffer;
EXPECT_EQ(ftl::to_chars(buffer, INT64_MIN, ftl::Radix::kHex), "-0x8000000000000000");
}
}
} // namespace android::test
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