Cardamom/output.cpp at main · ethanolchik/Cardamom · GitHub

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#include <iostream>
#include <vector>
#include <string>
#include <sstream>
#include <cstdlib>
#include "std.hpp"

void println(std::string s) {
    std::cout << s << std::endl;
}
std::string input() {
    std::string line;
    std::getline(std::cin, line);
    return line;
}
int len(std::string s) {
    return s.size();
}
std::string charAt(std::string s, int i) {
    return std::string(1, s.at(i));
}
std::string toString(int s) {
    return std::to_string(s);
}
std::string fromASCII(int ascii) {
    return std::string(1, static_cast<char>(ascii));
}
void bf(std::string code)
{
    std::vector<int> tape = {0};
    int ptr = 0;
    int code_len = len(code);
    int code_ptr = 0;
    std::vector<int> loop_stack = {0};
    while ((code_ptr < code_len))     {
        std::string command = charAt(code, code_ptr);
        if ((command == ">"))         {
            ptr += 1;
            if ((ptr == tape.size()))             {
                tape.push_back(0);
            }
        }
        else
            if ((command == "<"))             {
                if ((ptr > 0))                 {
                    ptr -= 1;
                }
            }
            else
                if ((command == "+"))                 {
                    tape[ptr] += 1;
                }
                else
                    if ((command == "-"))                     {
                        tape[ptr] -= 1;
                    }
                    else
                        if ((command == "."))                         {
                            println(fromASCII(tape[ptr]));
                        }
                        else
                            if ((command == ","))                             {
                                std::string input_char = input();
                                if ((len(input_char) > 0))                                 {
                                    tape[ptr] = static_cast<int>(static_cast<unsigned char>(input_char.at(0)));
                                }
                            }
                            else
                                if ((command == "["))                                 {
                                    if ((tape[ptr] == 0))                                     {
                                        int open_brackets = 1;
                                        while ((open_brackets > 0))                                         {
                                            code_ptr += 1;
                                            if ((charAt(code, code_ptr) == "["))                                             {
                                                open_brackets += 1;
                                            }
                                            else
                                                if ((charAt(code, code_ptr) == "]"))                                                 {
                                                    open_brackets -= 1;
                                                }
                                        }
                                    }
                                    else                                     {
                                        loop_stack.push_back(code_ptr);
                                    }
                                }
                                else
                                    if ((command == "]"))                                     {
                                        if ((tape[ptr] != 0))                                         {
                                            code_ptr = loop_stack[(loop_stack.size() - 1)];
                                        }
                                        else                                         {
                                            loop_stack.pop_back();
                                        }
                                    }
        code_ptr += 1;
    }
}
int main()
{
    println("Enter bf code: ");
    std::string x = input();
    bf(x);
    return 0;
}