Terminal.java

/* Copyright or (C) or Copr. GET / ENST, Telecom-Paris, Ludovic Apvrille
 * 
 * ludovic.apvrille AT enst.fr
 * 
 * This software is a computer program whose purpose is to allow the
 * edition of TURTLE analysis, design and deployment diagrams, to
 * allow the generation of RT-LOTOS or Java code from this diagram,
 * and at last to allow the analysis of formal validation traces
 * obtained from external tools, e.g. RTL from LAAS-CNRS and CADP
 * from INRIA Rhone-Alpes.
 * 
 * This software is governed by the CeCILL  license under French law and
 * abiding by the rules of distribution of free software.  You can  use,
 * modify and/ or redistribute the software under the terms of the CeCILL
 * license as circulated by CEA, CNRS and INRIA at the following URL
 * "http://www.cecill.info".
 * 
 * As a counterpart to the access to the source code and  rights to copy,
 * modify and redistribute granted by the license, users are provided only
 * with a limited warranty  and the software's author,  the holder of the
 * economic rights,  and the successive licensors  have only  limited
 * liability.
 * 
 * In this respect, the user's attention is drawn to the risks associated
 * with loading,  using,  modifying and/or developing or reproducing the
 * software by the user in light of its specific status of free software,
 * that may mean  that it is complicated to manipulate,  and  that  also
 * therefore means  that it is reserved for developers  and  experienced
 * professionals having in-depth computer knowledge. Users are therefore
 * encouraged to load and test the software's suitability as regards their
 * requirements in conditions enabling the security of their systems and/or
 * data to be ensured and,  more generally, to use and operate it in the
 * same conditions as regards security.
 * 
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL license and that you accept its terms.
 */




package myutil;


import java.util.Vector;

/**
 * Class Terminal
 * Creation: 21/03/2019
 * Version 2.0 21/03/2019
 * @author Ludovic APVRILLE
 */
public class Terminal {
    private final static int MAX_BUFFER_SIZE = 5000;

    private final static int CR = 10;

    private final static int BACKSPACE = 8;
    private final static int DEL = 127;

    private final static int ESC = 27;

    private final static int TAB = 9;

    private Vector<String> buffer;
    private int bufferPointer ;
    private int cursorPosition;
    private int promptLength = 0;
    private int maxbufferSize = MAX_BUFFER_SIZE;
    private TerminalProviderInterface terminalProvider;
    private int cpt;
    private String sequence;
    private String os;



   public Terminal() {
       buffer = new Vector<>();
       cpt = 0;
       os = System.getProperty("os.name").toLowerCase();
       System.out.println("Detected OS:" + os);
       os = os.split(" ")[0];
   }

   public void setTerminalProvider(TerminalProviderInterface tp) {
       terminalProvider = tp;
   }

   public String getNextCommand() {

       char x;
       int val = 0;
       cursorPosition = 0;


       printPrompt(cpt);

       String currentBuf = "";
       sequence = null;
       long timeSeq = 0;


       try {
           while(val != 3) {
               val = (RawConsoleInput.read(true));
               x = (char) val;

               // Special sequence?
               if (sequence == null) {
                   if (val == ESC) {
                       sequence = "";
                       timeSeq = System.currentTimeMillis();
                   }
               } else  {
                   //Time check
                   long now = System.currentTimeMillis();
                   if (now - timeSeq > 10) {
                       sequence = null;
                   } else {
                       sequence += x;
                   }
               }

               /*if (sequence != null) {
                   TraceManager.addDev("Sequence=" + sequence);
                   printSequence(sequence);
               }*/

               if ((sequence != null) && (sequence.length() == 2)) {

                   //UP?
                   if ((sequence.charAt(0) == 91) && (sequence.charAt(1) == 65)) {

                       //System.out.println("UP");
                       delCurrent(currentBuf);
                       bufferPointer = (bufferPointer > 0)? bufferPointer-1:bufferPointer;
                       currentBuf = buffer.get(bufferPointer);
                       //printPrompt(cpt);
                       myPrint(currentBuf);
                       sequence = null;
                       val = -1;


                    // DOWN?
                   } else if ((sequence.charAt(0) == 91) && (sequence.charAt(1) == 66)) {

                       //System.out.println("DOWN");
                       delCurrent(currentBuf);
                       bufferPointer = (bufferPointer==(buffer.size()-1))?bufferPointer:bufferPointer+1;
                       currentBuf = buffer.get(bufferPointer);
                       //printPrompt(cpt);
                       myPrint(currentBuf);
                       sequence = null;
                       val = -1;


                   // BACKWARD
                   } else if ((sequence.charAt(0) == 91) && (sequence.charAt(1) == 68)) {

                       //System.out.println("DOWN");
                       backward();
                       sequence = null;
                       val = -1;

                   // FORWARD
                    } else if ((sequence.charAt(0) == 91) && (sequence.charAt(1) == 67)) {

                   //System.out.println("DOWN");
                   forward(currentBuf);
                   sequence = null;
                   val = -1;
                   // DEL
                   //TraceManager.addDev("DEL");
               }
               }

               if ((sequence != null) && (sequence.length() == 3)) {

                   // DEL
                   if ((sequence.charAt(0) == 91) && (sequence.charAt(1) == 51) &&
                           (sequence.charAt(2) == 126)) {
                       currentBuf = del(currentBuf);
                       cursorPosition --;
                       
                       sequence = null;
                        val = -1;
                       //TraceManager.addDev("DEL");
                   }

               }

               // Usual CHAR
               if ((sequence == null) && (val != -1)) {

                   // CR
                   if (val == CR) {
                       cursorPosition = 0;
                       if (currentBuf.length() == 0) {
                           myPrint("\n");
                           printPrompt(cpt);
                       } else {
                           cpt++;

                           //if (!(os.startsWith("mac"))) {
                               myPrint("\n");
                           //}
                           addToBuffer(currentBuf);
                           return currentBuf;
                       }
                   }

                   //BACKSPACE
                   if ((val == BACKSPACE) || (val == DEL)) {
                       currentBuf = del(currentBuf);

                    //TAB
                   } else if (val == TAB) {
                       System.out.println("TAB");
                       if (terminalProvider != null) {
                           boolean b =terminalProvider.tabAction(currentBuf);
                           if (b) {
                               printPrompt(cpt);
                           }
                       }

                   // Regular character
                   } else if (val >= 32) {
                       //System.out.print("" + x + "(val=" + val + ");");
                       if (cursorPosition == currentBuf.length()) {
                           myPrint("" + x);
                           currentBuf += x;
                       } else {
                           currentBuf = currentBuf.substring(0,cursorPosition-1) + x + currentBuf.substring(cursorPosition, currentBuf.length());
                           myPrint("" + x + currentBuf.substring(cursorPosition, currentBuf.length()));
                       }
                       cursorPosition ++;
                   }
               }

           }
       } catch (Exception e) {
           TraceManager.addDev("Exception in terminal:" + e.getMessage());
           return null;
       }


    return "";
   }

   private void addToBuffer (String newBuf) {
       // Add at bufferPointer
       // Therefore remove all elements after bufferPointer
       for(int i=buffer.size()-1; i>=bufferPointer; i--) {
           buffer.removeElementAt(i);
       }

       buffer.add(newBuf);

       if (buffer.size() > maxbufferSize) {
           buffer.removeElementAt(0);
       }

       bufferPointer = buffer.size();

   }


   private String del(String currentBuf) {
       if (currentBuf.length() > 0) {
           myPrint("\b \b");
           currentBuf = currentBuf.substring(0, currentBuf.length() - 1);
       }
       return currentBuf;
   }

   public void myPrint(String s) {
       //if (os.compareTo("mac") != 0) {
           System.out.print(s);
        //}
       System.out.flush();
   }



    private String delCurrent(String currentBuf) {
        if (buffer.size() > 0) {
            int size = currentBuf.length();
            for(int i=0; i<size; i++) {
                currentBuf =  del(currentBuf);
            }
        }
        return currentBuf;

    }


    public void printPrompt(int cpt) {
       String p = "" + cpt + "> ";
       promptLength = p.length();
       System.out.print(p);
    }

    private void backward() {
       if (cursorPosition == 0) {
           return;
       }
       System.out.print("\033[1D");
       cursorPosition --;
    }

    private void forward(String currentBuf) {
       if (cursorPosition == currentBuf.length()) {
           return ;
       }
        System.out.print("\033[1C");
        cursorPosition ++;
    }




}