SNF4CGP/SNF4CGP/InputProcessor.cpp

// SNF4CGP/InputProcessor.cpp
// Copyright (C) 2009 ARM Research Labs, LLC.
// See www.armresearch.com for more information.

#include "InputProcessor.hpp"
#include "Command.hpp"

#include <iostream>
#include <sstream>
#include <string>

using namespace std;

//// InputProcessor ////////////////////////////////////////////////////////////

Command& parseCommandNumber(istringstream& S, Command& C) {
    S >> C.Number;
    S.ignore();
    return C;
}

const string INTFCommand = "INTF";
const string QUITCommand = "QUIT";
const string FILECommand = "FILE";

Command& parseCommandType(istringstream& S, Command& C) {
    string TypeString;
    S >> TypeString;
    S.ignore();

    switch(TypeString[0]) {
        case 'I' : if(INTFCommand == TypeString) C.Type = Command::INTF; break;
        case 'F' : if(FILECommand == TypeString) C.Type = Command::FILE; break;
        case 'Q' : if(QUITCommand == TypeString) C.Type = Command::QUIT; break;
        default : break;
    }
    return C;
}

Command& parseCommandData(istringstream& S, Command& C) {
    getline(S,C.Data);
    return C;
}

Command InputProcessor::getCommand() {                                          // How to get/parse a command
    string InputLine;
    getline(cin, InputLine);
    istringstream InputLineStream(InputLine);

    Command NewCommand;
    parseCommandNumber(InputLineStream, NewCommand);                            // First thing is always a number.
    parseCommandType(InputLineStream, NewCommand);                              // Next is always a command name.
    parseCommandData(InputLineStream, NewCommand);                              // The rest is data for the command.

    if(Command::UNKNOWN == NewCommand.Type) NewCommand.Data = InputLine;        // Capture unknown inputs for later.

    return NewCommand;
}