/*
 * -----------------------------------------------------
 * CS2S03/SE2S03, November 2011
 * Assignment 5, Question 4
 * File: PE1012.cpp
 * -----------------------------------------------------
 * This program implements a simple character editor,
 * which is used to test the buffer class. The editor
 * reads and executes simple commands entered by the
 * user.
 * --------------------------------------------------
 */

#include "genlib.h"
#include "buffer.h"
#include "simpio.h"
#include <iostream>
#include <cctype>

/* Private function prototypes */

void ExecuteCommand(EditorBuffer & buffer, string line);

/* Main program */

int main() {

    EditorBuffer buffer;

    while (true) {
        cout << "*";
        string cmd = GetLine();
        if (cmd != "") ExecuteCommand(buffer, cmd);
        buffer.display();
    }

    return 0;
}

/*
 * Function: ExecuteCommand
 * Usage: ExecuteCommand(buffer, line)
 * -----------------------------------
 * This function executes a single editor command.
 */

void ExecuteCommand(EditorBuffer & buffer, string line) {
    switch (toupper(line[0])) {
      case 'I': for (int i = 1; i < line.length(); i++) {
                    buffer.insertCharacter(line[i]);
		}
                break;
      case 'D': buffer.deleteCharacter(); break;
      case 'F': buffer.moveCursorForward(); break;
      case 'B': buffer.moveCursorBackward(); break;
      case 'J': buffer.moveCursorToStart(); break;
      case 'E': buffer.moveCursorToEnd(); break;
      case 'Q': exit(0);
      default: cout << "Illegal command" << endl; break;
    }
}