gb_table_parser.cpp

// silly hack job to parse http://www.pastraiser.com/cpu/gameboy/gameboy_opcodes.html into a list with hex and binary representations of opcodes, in order to find patterns.

#include <algorithm>
#include <string>
#include <iostream>
#include <iomanip>
#include <fstream>

int main(int argc, char** argv)
{
        if (argc != 2)
        {
                std::cout << "Syntax: ./parse [file]\n";
        }

        std::cout << std::hex << std::uppercase;

        std::ifstream file{argv[1]};
        std::string s = {std::istreambuf_iterator{file}, {}};

        std::string_view pattern = "<td class=\"withborder\"";
        std::string_view bad_pattern = "<td class=\"withborder\" bgcolor=\"#9f9f9f";

        auto it = std::search(s.begin(), s.end(), pattern.begin(), pattern.end());

        auto set_next_it = [&] { it = std::search(it + pattern.size(), s.end(), pattern.begin(), pattern.end()); };

        unsigned row = 0, col = 0;

        while (it != s.end())
        {
                if (std::string_view{&(*it), bad_pattern.size()} == bad_pattern)
                {
                        set_next_it();
                        continue;
                }

                std::cout << "Opcode 0x" << row << col << " (0b";

                int num = col | (row << 4);
                for (int i = 7; i >= 0; --i)
                {
                        std::cout << ((num >> i) & 0b1);
                }

                std::cout << "): ";

                auto name_it = std::find(it, s.end(), '>') + 1;
                auto name_ite = std::find(name_it, s.end(), '<');
                std::string_view name(&(*name_it), std::distance(name_it, name_ite));

                if (name != "&nbsp;")
                {
                        std::cout << name;
                }
                else
                {
                        std::cout << "** BAD **\n";
                        set_next_it();
                        continue;
                }

                std::string_view dur(&name_ite[4], std::distance(name_ite + 4, std::find(name_ite + 4, s.end(), '<')));

                std::cout << "; " << dur[0] << " bytes; " << std::string_view(&dur[13], std::distance(dur.begin() + 13, dur.end())) << " cycles";

                set_next_it();

                if (col++ == 0xF)
                {
                        ++row;
                        col = 0;
                }

                std::cout << "\n";
        }
}