#include <stdio.h>
#include <stdlib.h>

void
printEnumHeader(FILE *out)
{
    fprintf(out, "enum TokenKind\n");
    fprintf(out, "{\n");
}

void
printEnumFooter(FILE *out)
{
    fprintf(out, "};\n");
}

void
printStrHeader(FILE *out)
{
    fprintf(out, "const char *\n");
    fprintf(out, "strTokenKind(enum TokenKind tokenKind)\n");
    fprintf(out, "{\n");
    fprintf(out, "%*sswitch (tokenKind) {\n", 4, "");
}

void
printStrFooter(FILE *out)
{
    fprintf(out, "%*sdefault:\n", 4, "");
    fprintf(out,
            "%*sfprintf(stderr, \"internal error in strTokenKind: "
            "tokenKind = %%d\",",
            8, "");
    fprintf(out, "%*stokenKind);\n", 4, "");
    fprintf(out, "%*sfinalizeExit(1);\n", 4, "");
    fprintf(out, "%*sreturn \"\";\n", 4, "");
    fprintf(out, "%*s}\n", 4, "");
    fprintf(out, "}\n");
}

void
usage(const char *prg)
{
    fprintf(stderr, "usage: %s input output1 outpu2\n", prg);
    exit(1);
}

int
main(int argc, char *argv[])
{
    if (argc != 4) {
        usage(argv[0]);
    }

    FILE *in = fopen(argv[1], "r");
    FILE *outEnum = fopen(argv[2], "w");
    FILE *outStr = fopen(argv[3], "w");

    if (!in) {
        fprintf(stderr, "can not open input file '%s'\n", argv[1]);
    }
    if (!outEnum) {
        fprintf(stderr, "can not open output file '%s'\n", argv[2]);
    }
    if (!outStr) {
        fprintf(stderr, "can not open output file '%s'\n", argv[3]);
    }

    printEnumHeader(outEnum);
    printStrHeader(outStr);

    char *line = 0;
    size_t capacity = 0;
    ssize_t len;
    while ((len = getline(&line, &capacity, in)) > 0) {
        line[len - 2] == '\r' ?  (line[len - 2] = 0) : (line[len - 1] = 0);
        fprintf(outEnum, "%*s%s,\n", 4, "", line);

        fprintf(outStr, "%*scase %s:\n", 4, "", line);
        fprintf(outStr, "%*sreturn \"%s\";\n", 8, "", line);
    }
    free(line);

    printEnumFooter(outEnum);
    printStrFooter(outStr);

    fclose(in);
    fclose(outEnum);
    fclose(outStr);
}