/*
 * @(#)KeyStrokenizer.java
 * Copyright:    Copyright (c) 2001
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA
 *
 */

package org.tn5250j.framework.tn5250;

import android.util.Log;



public class KeyStrokenizer {
    private static final String TAG = "KeyStrokenizer";
    private StringBuffer keyStrokes;
    private StringBuffer sb;
    private int index;
    private int length;



    public KeyStrokenizer() {
        sb = new StringBuffer();
        setKeyStrokes(null);
    }

    public void setKeyStrokes(String strokes) {
        if (strokes != null) {
            keyStrokes.setLength(0);
            Log.d(TAG, "set " + strokes);
            length = strokes.length();
        }
        else {
            keyStrokes = new StringBuffer();
            length = 0;
        }

        keyStrokes.append(strokes);
        index = 0;
    }

    public boolean hasMoreKeyStrokes() {
        return length > index;
    }

    public String nextKeyStroke() {
        String s = "";
        boolean gotOne = false;

        if (length > index) {
            sb.setLength(0);
            char c = keyStrokes.charAt(index);

            switch (c) {
                case '[':
                    sb.append(c);
                    index++;

                    // we need to throw an error here
                    if (index >= length) {
                        Log.w(TAG, " mnemonic key was incomplete :1 " +
                              "at position " + index + " len " + length);
                    }
                    else {
                        c = keyStrokes.charAt(index);

                        if (c == '[')
                            index++;
                        else {
                            while (!gotOne) {
                                if (c == ']') { // did we find an ending
                                    sb.append(c);
                                    index++;
                                    gotOne = true;
                                }
                                else {
                                    sb.append(c);
                                    index++;

                                    // we need to throw an error here because we did not
                                    //   find an ending for the potential mnemonic
                                    if (index >= length) {
                                        Log.w(TAG,
                                              " mnemonic key was incomplete ending not found :2 " +
                                              "at position " + index);
                                    }

                                    c = keyStrokes.charAt(index);
                                }
                            }
                        }
                    }

                    break;

                case ']':
                    index++;

                    if (index >= length) {
                        Log.w(TAG,
                              " mnemonic key was incomplete ending not found :3 " +
                              "at position " + index);
                        sb.append(c);
                        index++;
                    }
                    else {
                        c = keyStrokes.charAt(index);

                        if (c == ']') {
                            sb.append(c);
                            index++;
                        }
                        else {
                            Log.w(TAG,
                                  " mnemonic key was incomplete beginning not found :4 " +
                                  "at position " + index);
                        }
                    }

                    break;

                default:
                    sb.append(c);
                    index++;
                    break;
            }

            if (sb != null) {
                s = new String(sb);
            }
        }

        Log.d(TAG, "next " + keyStrokes);
        return s;
    }

    public String getUnprocessedKeyStroked() {
        if (index >= length) {
            return null;
        }

        return keyStrokes.substring(index);
    }

}