So I wrote brain.......... interpreter

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  1. #1
    Supermassive black hole cboard_member's Avatar
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    So I wrote brain.......... interpreter

    Had the morning off so I decided to spend ~1.5 hours of it writing a little brain.......... interpreter. It works so far (the hello world program on the wiki page / website runs, that's the biggest program I've tested it on).

    I've added a little feature, where the first line should be a number (signed integer) signifying how much memory should be allocated for you to play with. Also, because I wanted (OK, needed) a corny way to terminate the processing loop, you have to end your program with 'E'

    So hello world now looks like this:

    Code:
    120
    ++++++++++
    [
       >+++++++>++++++++++>+++>+<<<<-
    ]
    >++.
    >+.
    +++++++.
    .
    +++.
    >++.
    <<+++++++++++++++.
    >.
    +++.
    ------.
    --------.
    >+.
    >.
    E
    120 is way too much, I just left it over from a couple of debugging test runs.

    Yeah this thread has nothing to do with anything except I've got nothing to do.

    Hmm, maybe would could make this a contest?

    EDIT: Oh yeah, the program: http://www.ahluka.co.uk/bf.rar

    EDIT2: Oh yeah, usage. Just write you program in a text file and "b.......... <filename>" on the command line. Obviously change the * to a u.

    EDIT3: Stoopid dots. It's b-F WORD.

    EDIT4: Actually that one is broken. Taking link down to fix

    EDIT5: Got there eventually.
    Last edited by cboard_member; 04-05-2006 at 04:18 AM.
    Good class architecture is not like a Swiss Army Knife; it should be more like a well balanced throwing knife.

    - Mike McShaffry

  2. #2
    aoeuhtns
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    What, no source code?

    Well, have a Bool........ interpreter. http://www.rpi.edu/~hughes/boof/
    There are 10 types of people in this world, those who cringed when reading the beginning of this sentence and those who salivated to how superior they are for understanding something as simple as binary.

  3. #3
    Supermassive black hole cboard_member's Avatar
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    Quote Originally Posted by Rashakil Fol
    What, no source code?

    Well, have a Bool........ interpreter. http://www.rpi.edu/~hughes/boof/
    Don't be silly mine is so poorly written it's embarressing.

    I found an implementation written in 3 lines of C (well, several statements / expressions on each line). Mine is 112, including header comment I haven't included here.


    Code:
    #include "stdafx.h"
    
    using namespace std;
    
    int main(int argc, char *argv[])
    {
        FILE *f = 0;
        char *programArray = 0;
        char *ptr = 0;
        char *ch = new char;
        char line[60] = {0};
        char *lnPtr = line;
        char *commandBuf = new char[2048];
        int arraySz = 0;
        char *lback;
        char *lford;
    
    
        if (argc != 2)
        {
            cout << "Usage: b........ <filename>" << endl;
            return -1;
        }
    
        f = fopen(argv[1], "r");
        if (! f)
        {
            cout << "Error opening file " << argv[1] << endl;
            return -1;
        }
    
        // attempt to get arraySz from first line
        fgets(line, 60, f);
        if (sscanf(line, "%d", &arraySz) != 1)
            arraySz = 100;  // default size
        cout << "array size: " << arraySz << endl;
        memset(line, 0, 60);
    
        try
        {
            programArray = new char[arraySz];
        }
        catch (bad_alloc& e)
        {
            cout << "Error: " << e.what() << endl;
            return -1;
        }
    
        for (int i = 0; i < arraySz; i++)
            *(programArray + i) = 0;
    
        // read whole program into commandBuf
        ptr = commandBuf;
        while ((*ch = fgetc(f)) != EOF)
            *ptr++ = *ch;
        ptr = &programArray[0];
        ch = &commandBuf[0];
    
        while (*ch != 'E')
        {
            switch (*ch)
            {
            case '>':
                ++ptr;
                break;
            case '<':
                --ptr;
                break;
            case '+':
                ++*ptr;
                break;
            case '-':
                --*ptr;
                break;
            case '.':
                cout << *ptr;
                break;
            case ',':
                cin >> *ptr;
                break;
            case '[':
                lback = ch;
                if (*ptr == 0)
                {
                    while (*ch != ']')
                        ++ch;
                    lford = ch;
                    ch = lback;
                }
                break;
            case ']':
                if (*ptr != 0)
                {
                    ch = lback;
                }
                break;
            }
    
            ch++;
        }
    
        delete[] programArray;
        delete[] commandBuf;
        return 0;
    }
    Yeah it's fugly but it works. I've have no intention of updating it or anything since it was just written to waste an hour or so.

    Slag it off if you feel the need, I'll just nod thoughtfully and go "I see".

    (I probably will edit it, but you don't know that).
    Good class architecture is not like a Swiss Army Knife; it should be more like a well balanced throwing knife.

    - Mike McShaffry

  4. #4
    ~viaxd() viaxd's Avatar
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    there is no need to use 'E'

    Code:
        
    ...
    while ((*ch = fgetc(f)) != EOF)
      *ptr++ = *ch;
    while(--ptr - commandBuf >= 0)
    {
    ...
    }
    i think that should work
    :wq

  5. #5
    Supermassive black hole cboard_member's Avatar
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    Damn you. I'll try it and see.
    Good class architecture is not like a Swiss Army Knife; it should be more like a well balanced throwing knife.

    - Mike McShaffry

  6. #6
    the Great ElastoManiac's Avatar
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    What the hell is this brain.......... interpreter. And what does it do.
    It seems to me that it converts source files into some other files with '+' and something.
    I'm a little dumb so i don't get it, Can you explain it to me.
    lu lu lu I've got some apples lu lu lu You've got some too lu lu lu Let's make some applesauce Take off our clothes and lu lu lu

  7. #7
    C++ Witch laserlight's Avatar
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    What the hell is this brain.......... interpreter. And what does it do.
    It seems to me that it converts source files into some other files with '+' and something.
    For reasons of sanity, I dont program in this language, but it could be an interpreter for this programming language.
    C + C++ Compiler: MinGW port of GCC
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