itoatest.cpp 3.73 KB
Newer Older
1 2 3
// Tencent is pleased to support the open source community by making RapidJSON available.
// 
// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
miloyip's avatar
miloyip committed
4
//
5 6
// Licensed under the MIT License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
miloyip's avatar
miloyip committed
7
//
8
// http://opensource.org/licenses/MIT
miloyip's avatar
miloyip committed
9
//
10 11 12 13
// 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.
miloyip's avatar
miloyip committed
14 15 16 17

#include "unittest.h"
#include "rapidjson/internal/itoa.h"

miloyip's avatar
miloyip committed
18 19 20 21 22
#ifdef __GNUC__
RAPIDJSON_DIAG_PUSH
RAPIDJSON_DIAG_OFF(type-limits)
#endif

miloyip's avatar
miloyip committed
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 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154
using namespace rapidjson::internal;

template <typename T>
struct Traits {
};

template <>
struct Traits<uint32_t> {
    enum { kBufferSize = 11 };
    enum { kMaxDigit = 10 };
    static uint32_t Negate(uint32_t x) { return x; };
};

template <>
struct Traits<int32_t> {
    enum { kBufferSize = 12 };
    enum { kMaxDigit = 10 };
    static int32_t Negate(int32_t x) { return -x; };
};

template <>
struct Traits<uint64_t> {
    enum { kBufferSize = 21 };
    enum { kMaxDigit = 20 };
    static uint64_t Negate(uint64_t x) { return x; };
};

template <>
struct Traits<int64_t> {
    enum { kBufferSize = 22 };
    enum { kMaxDigit = 20 };
    static int64_t Negate(int64_t x) { return -x; };
};

template <typename T>
static void VerifyValue(T value, void(*f)(T, char*), char* (*g)(T, char*)) {
    char buffer1[Traits<T>::kBufferSize];
    char buffer2[Traits<T>::kBufferSize];

    f(value, buffer1);
    *g(value, buffer2) = '\0';
    

    EXPECT_STREQ(buffer1, buffer2);
}

template <typename T>
static void Verify(void(*f)(T, char*), char* (*g)(T, char*)) {
    // Boundary cases
    VerifyValue<T>(0, f, g);
    VerifyValue<T>(std::numeric_limits<T>::min(), f, g);
    VerifyValue<T>(std::numeric_limits<T>::max(), f, g);

    // 2^n - 1, 2^n, 10^n - 1, 10^n until overflow
    for (uint32_t power = 2; power <= 10; power += 8) {
        T i = 1, last;
        do {
            VerifyValue<T>(i - 1, f, g);
            VerifyValue<T>(i, f, g);
            if (std::numeric_limits<T>::min() < 0) {
                VerifyValue<T>(Traits<T>::Negate(i), f, g);
                VerifyValue<T>(Traits<T>::Negate(i + 1), f, g);
            }
            last = i;
            i *= power;
        } while (last < i);
    }
}

static void u32toa_naive(uint32_t value, char* buffer) {
    char temp[10];
    char *p = temp;
    do {
        *p++ = char(value % 10) + '0';
        value /= 10;
    } while (value > 0);

    do {
        *buffer++ = *--p;
    } while (p != temp);

    *buffer = '\0';
}

static void i32toa_naive(int32_t value, char* buffer) {
    uint32_t u = static_cast<uint32_t>(value);
    if (value < 0) {
        *buffer++ = '-';
        u = ~u + 1;
    }
    u32toa_naive(u, buffer);
}

static void u64toa_naive(uint64_t value, char* buffer) {
    char temp[20];
    char *p = temp;
    do {
        *p++ = char(value % 10) + '0';
        value /= 10;
    } while (value > 0);

    do {
        *buffer++ = *--p;
    } while (p != temp);

    *buffer = '\0';
}

static void i64toa_naive(int64_t value, char* buffer) {
    uint64_t u = static_cast<uint64_t>(value);
    if (value < 0) {
        *buffer++ = '-';
        u = ~u + 1;
    }
    u64toa_naive(u, buffer);
}

TEST(itoa, u32toa) {
    Verify(u32toa_naive, u32toa);
}

TEST(itoa, i32toa) {
    Verify(i32toa_naive, i32toa);
}

TEST(itoa, u64toa) {
    Verify(u64toa_naive, u64toa);
}

TEST(itoa, i64toa) {
    Verify(i64toa_naive, i64toa);
}
miloyip's avatar
miloyip committed
155 156 157 158

#ifdef __GNUC__
RAPIDJSON_DIAG_POP
#endif