CodeTranslator.cpp

/*
 * Created by Francois W. Nel on 27 Jun 2016.
 */

#include "CodeTranslator.h"

using namespace std;

CodeTranslator::CodeTranslator() {
    // Populate the translation map tables.
    destTable[""] = "000";
    destTable["M"] = "001";
    destTable["D"] = "010";
    destTable["MD"] = "011";
    destTable["A"] = "100";
    destTable["AM"] = "101";
    destTable["AD"] = "110";
    destTable["AMD"] = "111";

    compTable["0"] = "0101010";
    compTable["1"] = "0111111";
    compTable["-1"] = "0111010";
    compTable["D"] = "0001100";
    compTable["A"] = "0110000";
    compTable["!D"] = "0001101";
    compTable["!A"] = "0110001";
    compTable["-D"] = "0001111";
    compTable["-A"] = "0110011";
    compTable["D+1"] = "0011111";
    compTable["A+1"] = "0110111";
    compTable["D-1"] = "0001110";
    compTable["A-1"] = "0110010";
    compTable["D+A"] = "0000010";
    compTable["D-A"] = "0010011";
    compTable["A-D"] = "0000111";
    compTable["D&A"] = "0000000";
    compTable["D|A"] = "0010101";
    compTable["M"] = "1110000";
    compTable["!M"] = "1110001";
    compTable["-M"] = "1110011";
    compTable["M+1"] = "1110111";
    compTable["M-1"] = "1110010";
    compTable["D+M"] = "1000010";
    compTable["D-M"] = "1010011";
    compTable["M-D"] = "1000111";
    compTable["D&M"] = "1000000";
    compTable["D|M"] = "1010101";

    jumpTable[""] = "000";
    jumpTable["JGT"] = "001";
    jumpTable["JEQ"] = "010";
    jumpTable["JGE"] = "011";
    jumpTable["JLT"] = "100";
    jumpTable["JNE"] = "101";
    jumpTable["JLE"] = "110";
    jumpTable["JMP"] = "111";
}

string CodeTranslator::dest(string destMnemonic, unsigned long& lineNr) {
    if (destTable.find(destMnemonic) != destTable.end()) {
        return destTable[destMnemonic];
    }

    // If none of the mnemonics are found, output an error message,
    //  and provide the line number in the original source where the error occurred.
    cout << "Invalid syntax in destination statement at line: " << lineNr << endl;
    exit(1);
}

string CodeTranslator::comp(string compMnemonic, unsigned long& lineNr) {
    if (compTable.find(compMnemonic) != compTable.end()) {
        return compTable[compMnemonic];
    }

    // If none of the mnemonics are found, output an error message,
    //  and provide the line number in the original source where the error occurred.
    cout << "Invalid syntax in computation statement at line: " << lineNr << endl;
    exit(1);
}

string CodeTranslator::jump(string jumpMnemonic, unsigned long& lineNr) {
    if (jumpTable.find(jumpMnemonic) != jumpTable.end()) {
        return jumpTable[jumpMnemonic];
    }

    // If none of the mnemonics are found, output an error message,
    //  and provide the line number in the original source where the error occurred.
    cout << "Invalid syntax in jump statement at line: " << lineNr << endl;
    exit(1);
}