c-quin

#include <stdio.h>

/* Here we include the source code up to this point. */
const char* pre[] = {
    "#include <stdio.h>",
    "",
    "/* Here we include the source code up to this point. */",
    NULL
};

const char* post[] = {
    "/* Take as input an array of strings",
    " * and output each one on its own line,",
    " * ending when we get to a NULL pointer.",
    " */",
    "void putCode(const char** code)",
    "{",
    "    for(; *code != NULL; code++) {",
    "        puts(*code);",
    "    }",
    "}",
    "",
    "/* Output the C escape sequence for a character",
    " * inside of a C-string that we will print as code.",
    " *",
    " * If you use more special characters in the source,",
    " * you need to expand this function.",
    " *",
    " * The encoding of this function in the string",
    " * version of the code is particularily entertaining",
    " * because all the characters are double-escaped.",
    " */",
    "const char* encodeChar(char c)",
    "{",
    "    if(c == '\"')",
    "        return \"\\\\\\\"\";",
    "    else if(c == '\\\\')",
    "        return \"\\\\\\\\\"; /* lol */",
    "    return NULL;",
    "}",
    "",
    "/* Output the code for a const char* array",
    " * given the source code for that array.",
    " */",
    "void putStr(const char* varName, const char** code)",
    "{",
    "    printf(\"const char* %s[] = {\\n\", varName);",
    "    for(; *code != NULL; code++)",
    "    {",
    "        const char* line;",
    "",
    "        /* each line starts with an indent and a quote */",
    "        printf(\"    \\\"\");",
    "        for(line = *code; *line != '\\0'; ++line)",
    "        {",
    "            const char* encoded = encodeChar(*line);",
    "",
    "            if(encoded == NULL)",
    "            {",
    "                /* Most characters encode to themselves */",
    "                printf(\"%c\", *line);",
    "            }",
    "            else",
    "            {",
    "                /* But some need extra magic */",
    "                printf(\"%s\", encoded);",
    "            }",
    "        }",
    "",
    "        /* and ends with a quote, comma, and newline */",
    "        printf(\"\\\",\\n\");",
    "    }",
    "",
    "    /* terminate the array with a NULL sentinel */",
    "    printf(\"    NULL\\n};\\n\\n\");",
    "}",
    "",
    "int main()",
    "{",
    "    putCode(pre);",
    "    putStr(\"pre\", pre);",
    "    putStr(\"post\", post);",
    "    putCode(post);",
    "    return 0;",
    "}",
    NULL
};

/* Take as input an array of strings
 * and output each one on its own line,
 * ending when we get to a NULL pointer.
 */
void putCode(const char** code)
{
    for(; *code != NULL; code++) {
        puts(*code);
    }
}

/* Output the C escape sequence for a character
 * inside of a C-string that we will print as code.
 *
 * If you use more special characters in the source,
 * you need to expand this function.
 *
 * The encoding of this function in the string
 * version of the code is particularily entertaining
 * because all the characters are double-escaped.
 */
const char* encodeChar(char c)
{
    if(c == '"')
        return "\\\"";
    else if(c == '\\')
        return "\\\\"; /* lol */
    return NULL;
}

/* Output the code for a const char* array
 * given the source code for that array.
 */
void putStr(const char* varName, const char** code)
{
    printf("const char* %s[] = {\n", varName);
    for(; *code != NULL; code++)
    {
        const char* line;

        /* each line starts with an indent and a quote */
        printf("    \"");
        for(line = *code; *line != '\0'; ++line)
        {
            const char* encoded = encodeChar(*line);

            if(encoded == NULL)
            {
                /* Most characters encode to themselves */
                printf("%c", *line);
            }
            else
            {
                /* But some need extra magic */
                printf("%s", encoded);
            }
        }

        /* and ends with a quote, comma, and newline */
        printf("\",\n");
    }

    /* terminate the array with a NULL sentinel */
    printf("    NULL\n};\n\n");
}

int main()
{
    putCode(pre);
    putStr("pre", pre);
    putStr("post", post);
    putCode(post);
    return 0;
}