• 文章
  • Brainf*ck 到 C 語言的翻譯器
由 釋出
2012年12月19日 (最後更新: 2013年1月4日)

Brainf*ck 到 C 語言的翻譯器

評分：3.6/5 (35 票)
*****
修改歷史
  • 2012-12-19 - 第一個版本。
  • 2012-12-29 - 修復了迴圈巢狀（迴圈最多可以巢狀 10 層）以及由於複製和貼上錯誤導致的錯誤 brainf*ck 程式碼。
  • 2013-01-04 - 添加了巢狀迴圈的示例。

這是一個 C++ 程式，可以將 Brainf*ck 翻譯成 C 語言。它生成的程式碼非常醜陋，但它有效。

翻譯器原始碼
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
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
 
#include <iostream>
#include <sstream>
#include <string>
#include <vector>

#define BF_BUFFER_MIN     "0"
#define BF_BUFFER_MAX "32768"

static const char* BF_HEAD =  "#include <stdint.h>\n"
                              "#include <stdio.h>\n"
                              "\n"
                              "#define BUFFER_MIN " BF_BUFFER_MIN "\n"
                              "#define BUFFER_MAX " BF_BUFFER_MAX "\n"
                              "\n"
                              "int main(void)\n"
                              "{\n"
                              "    static uint8_t buffer[BUFFER_MAX];\n"
                              "    static uint32_t index = 0;\n";
static const char* BF_IPTR =  "    if (index < BUFFER_MAX)\n"
                              "        ++index;\n"
                              "    else\n"
                              "        index = 0;\n";
static const char* BF_DPTR =  "    if (index > BUFFER_MIN)\n"
                              "        --index;\n"
                              "    else\n"
                              "        index = BUFFER_MAX - 1;\n";
static const char* BF_IVAL =  "    ++buffer[index];\n";
static const char* BF_DVAL =  "    --buffer[index];\n";
static const char* BF_PUTC =  "    putchar(buffer[index]);\n";
static const char* BF_GETC =  "    buffer[index] = getchar();\n";
static const char* BF_LOOP1 = "L$a:\n"
                              "    if (buffer[index] == 0)\n"
                              "        goto L$b;\n";
static const char* BF_LOOP2 = "L$b:\n"
                              "    if (buffer[index] != 0)\n"
                              "        goto L$a;\n";
static const char* BF_TAIL =  "    return 0;\n"
                              "}\n";

static std::string replace_all(const std::string& a, const std::string& b, std::string s)
{
    size_t pos = 0;
    while ((pos = s.find(a)) != std::string::npos)
        s.replace(pos, a.size(), b);
    return s;
}

static std::string chars2string(std::vector <char> chars)
{
    std::stringstream sstream;
    for (char c : chars)
        sstream << c;
    return sstream.str();
}

int main()
{
    int c, label = 1, nest = 0;
    std::cout << BF_HEAD;
    while ((c = std::cin.get())) {
        if (std::cin.eof())
            break;
        switch (c) {
        case '>': std::cout << BF_IPTR; break;
        case '<': std::cout << BF_DPTR; break;
        case '+': std::cout << BF_IVAL; break;
        case '-': std::cout << BF_DVAL; break;
        case '.': std::cout << BF_PUTC; break;
        case ',': std::cout << BF_GETC; break;
        case '[':
            std::cout << replace_all("$", chars2string({ char(label + '0'),
                                            char(nest + '0') }), BF_LOOP1);
            ++nest;
            break;
        case ']':
            --nest;
            std::cout << replace_all("$", chars2string({ char(label + '0'),
                                            char(nest + '0') }), BF_LOOP2);
            if (!(nest))
                ++label;
            break;
        default:
            break;
        }
    }
    std::cout << BF_TAIL << std::endl;
    return 0;
}


示例輸入
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.

翻譯器輸出
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
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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
 
#include <stdint.h>
#include <stdio.h>

#define BUFFER_MIN 0
#define BUFFER_MAX 32768

int main(void)
{
    static uint8_t buffer[BUFFER_MAX];
    static uint32_t index = 0;
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
L10a:
    if (buffer[index] == 0)
        goto L10b;
    if (index < BUFFER_MAX)
        ++index;
    else
        index = 0;
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    if (index < BUFFER_MAX)
        ++index;
    else
        index = 0;
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    if (index < BUFFER_MAX)
        ++index;
    else
        index = 0;
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    if (index < BUFFER_MAX)
        ++index;
    else
        index = 0;
    ++buffer[index];
    if (index > BUFFER_MIN)
        --index;
    else
        index = BUFFER_MAX - 1;
    if (index > BUFFER_MIN)
        --index;
    else
        index = BUFFER_MAX - 1;
    if (index > BUFFER_MIN)
        --index;
    else
        index = BUFFER_MAX - 1;
    if (index > BUFFER_MIN)
        --index;
    else
        index = BUFFER_MAX - 1;
    --buffer[index];
L10b:
    if (buffer[index] != 0)
        goto L10a;
    if (index < BUFFER_MAX)
        ++index;
    else
        index = 0;
    ++buffer[index];
    ++buffer[index];
    putchar(buffer[index]);
    if (index < BUFFER_MAX)
        ++index;
    else
        index = 0;
    ++buffer[index];
    putchar(buffer[index]);
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    putchar(buffer[index]);
    putchar(buffer[index]);
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    putchar(buffer[index]);
    if (index < BUFFER_MAX)
        ++index;
    else
        index = 0;
    ++buffer[index];
    ++buffer[index];
    putchar(buffer[index]);
    if (index > BUFFER_MIN)
        --index;
    else
        index = BUFFER_MAX - 1;
    if (index > BUFFER_MIN)
        --index;
    else
        index = BUFFER_MAX - 1;
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    putchar(buffer[index]);
    if (index < BUFFER_MAX)
        ++index;
    else
        index = 0;
    putchar(buffer[index]);
    ++buffer[index];
    ++buffer[index];
    ++buffer[index];
    putchar(buffer[index]);
    --buffer[index];
    --buffer[index];
    --buffer[index];
    --buffer[index];
    --buffer[index];
    --buffer[index];
    putchar(buffer[index]);
    --buffer[index];
    --buffer[index];
    --buffer[index];
    --buffer[index];
    --buffer[index];
    --buffer[index];
    --buffer[index];
    --buffer[index];
    putchar(buffer[index]);
    if (index < BUFFER_MAX)
        ++index;
    else
        index = 0;
    ++buffer[index];
    putchar(buffer[index]);
    if (index < BUFFER_MAX)
        ++index;
    else
        index = 0;
    putchar(buffer[index]);
    return 0;
}


翻譯後的程式輸出
Hello World!

帶有巢狀迴圈的示例
[[[[[[[[]]]]]]]]

翻譯器輸出
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
61
62
63
64
65
66
67
68
69
70
71
72
 
#include <stdint.h>
#include <stdio.h>

#define BUFFER_MIN 0
#define BUFFER_MAX 32768

int main(void)
{
    static uint8_t buffer[BUFFER_MAX];
    static uint32_t index = 0;
L10a:
    if (buffer[index] == 0)
        goto L10b;
L11a:
    if (buffer[index] == 0)
        goto L11b;
L12a:
    if (buffer[index] == 0)
        goto L12b;
L13a:
    if (buffer[index] == 0)
        goto L13b;
L14a:
    if (buffer[index] == 0)
        goto L14b;
L15a:
    if (buffer[index] == 0)
        goto L15b;
L16a:
    if (buffer[index] == 0)
        goto L16b;
L17a:
    if (buffer[index] == 0)
        goto L17b;
L18a:
    if (buffer[index] == 0)
        goto L18b;
L19a:
    if (buffer[index] == 0)
        goto L19b;
L19b:
    if (buffer[index] != 0)
        goto L19a;
L18b:
    if (buffer[index] != 0)
        goto L18a;
L17b:
    if (buffer[index] != 0)
        goto L17a;
L16b:
    if (buffer[index] != 0)
        goto L16a;
L15b:
    if (buffer[index] != 0)
        goto L15a;
L14b:
    if (buffer[index] != 0)
        goto L14a;
L13b:
    if (buffer[index] != 0)
        goto L13a;
L12b:
    if (buffer[index] != 0)
        goto L12a;
L11b:
    if (buffer[index] != 0)
        goto L11a;
L10b:
    if (buffer[index] != 0)
        goto L10a;
    return 0;
}