001 /*
002 * Copyright (C) 2010 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019
020 package org.crsh.term;
021
022 import org.crsh.term.console.Console;
023 import org.crsh.term.console.ViewWriter;
024 import org.crsh.term.spi.TermIO;
025 import org.slf4j.Logger;
026 import org.slf4j.LoggerFactory;
027
028 import java.io.IOException;
029 import java.util.LinkedList;
030
031 /**
032 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
033 * @version $Revision$
034 */
035 public class BaseTerm implements Term {
036
037 /** . */
038 private final Logger log = LoggerFactory.getLogger(BaseTerm.class);
039
040 /** . */
041 private final LinkedList<CharSequence> history;
042
043 /** . */
044 private CharSequence historyBuffer;
045
046 /** . */
047 private int historyCursor;
048
049 /** . */
050 private final TermIO io;
051
052 /** . */
053 private final Console console;
054
055 public BaseTerm(final TermIO io) {
056 this.history = new LinkedList<CharSequence>();
057 this.historyBuffer = null;
058 this.historyCursor = -1;
059 this.io = io;
060 this.console = new Console(new ViewWriter() {
061
062 @Override
063 protected void flush() throws IOException {
064 io.flush();
065 }
066
067 @Override
068 protected void writeCRLF() throws IOException {
069 io.writeCRLF();
070 }
071
072 @Override
073 protected void write(CharSequence s) throws IOException {
074 io.write(s.toString());
075 }
076
077 @Override
078 protected void write(char c) throws IOException {
079 io.write(c);
080 }
081
082 @Override
083 protected void writeDel() throws IOException {
084 io.writeDel();
085 }
086
087 @Override
088 protected boolean writeMoveLeft() throws IOException {
089 return io.moveLeft();
090 }
091
092 @Override
093 protected boolean writeMoveRight(char c) throws IOException {
094 return io.moveRight(c);
095 }
096 });
097 }
098
099 public int getWidth() {
100 return io.getWidth();
101 }
102
103 public String getProperty(String name) {
104 return io.getProperty(name);
105 }
106
107 public void setEcho(boolean echo) {
108 console.setEchoing(echo);
109 }
110
111 public TermEvent read() throws IOException {
112
113 //
114 while (true) {
115 int code = io.read();
116 CodeType type = io.decode(code);
117 switch (type) {
118 case CLOSE:
119 return new TermEvent.Close();
120 case BACKSPACE:
121 console.getViewReader().del();
122 break;
123 case UP:
124 case DOWN:
125 int nextHistoryCursor = historyCursor + (type == CodeType.UP ? + 1 : -1);
126 if (nextHistoryCursor >= -1 && nextHistoryCursor < history.size()) {
127 CharSequence s = nextHistoryCursor == -1 ? historyBuffer : history.get(nextHistoryCursor);
128 while (console.getViewReader().moveRight()) {
129 // Do nothing
130 }
131 CharSequence t = console.getViewReader().replace(s);
132 if (historyCursor == -1) {
133 historyBuffer = t;
134 }
135 if (nextHistoryCursor == -1) {
136 historyBuffer = null;
137 }
138 historyCursor = nextHistoryCursor;
139 }
140 break;
141 case RIGHT:
142 console.getViewReader().moveRight();
143 break;
144 case LEFT:
145 console.getViewReader().moveLeft();
146 break;
147 case BREAK:
148 log.debug("Want to cancel evaluation");
149 console.clearBuffer();
150 return new TermEvent.Break();
151 case CHAR:
152 if (code >= 0 && code < 128) {
153 console.getViewReader().append((char)code);
154 } else {
155 log.debug("Unhandled char " + code);
156 }
157 break;
158 case TAB:
159 log.debug("Tab");
160 return new TermEvent.Complete(console.getBufferToCursor());
161 }
162
163 //
164 if (console.getReader().hasNext()) {
165 historyCursor = -1;
166 historyBuffer = null;
167 CharSequence input = console.getReader().next();
168 return new TermEvent.ReadLine(input);
169 }
170 }
171 }
172
173 public Appendable getInsertBuffer() {
174 return console.getViewReader();
175 }
176
177 public void addToHistory(CharSequence line) {
178 history.addFirst(line);
179 }
180
181 public CharSequence getBuffer() {
182 return console.getBufferToCursor();
183 }
184
185 public void close() {
186 try {
187 log.debug("Closing connection");
188 io.flush();
189 io.close();
190 } catch (IOException e) {
191 log.debug("Exception thrown during term close()", e);
192 }
193 }
194
195 public void write(CharSequence msg) throws IOException {
196 console.getWriter().write(msg);
197 }
198 }