001 /*
002 * Copyright (C) 2012 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.console;
021
022 import org.crsh.term.CodeType;
023 import org.crsh.term.Term;
024 import org.crsh.term.TermEvent;
025 import org.crsh.term.spi.TermIO;
026 import org.crsh.text.CLS;
027 import org.crsh.text.Chunk;
028 import org.crsh.text.Style;
029 import org.crsh.text.Text;
030 import org.slf4j.Logger;
031 import org.slf4j.LoggerFactory;
032
033 import java.io.IOException;
034 import java.util.LinkedList;
035
036 /**
037 * Implements the {@link Term interface}.
038 */
039 public class ConsoleTerm implements Term {
040
041 /** . */
042 private final Logger log = LoggerFactory.getLogger(ConsoleTerm.class);
043
044 /** . */
045 private final LinkedList<CharSequence> history;
046
047 /** . */
048 private CharSequence historyBuffer;
049
050 /** . */
051 private int historyCursor;
052
053 /** . */
054 private final TermIO io;
055
056 /** . */
057 private final TermIOBuffer buffer;
058
059 /** . */
060 private final TermIOWriter writer;
061
062 public ConsoleTerm(final TermIO io) {
063 this.history = new LinkedList<CharSequence>();
064 this.historyBuffer = null;
065 this.historyCursor = -1;
066 this.io = io;
067 this.buffer = new TermIOBuffer(io);
068 this.writer = new TermIOWriter(io);
069 }
070
071 public int getWidth() {
072 return io.getWidth();
073 }
074
075 public int getHeight() {
076 return io.getHeight();
077 }
078
079 public String getProperty(String name) {
080 return io.getProperty(name);
081 }
082
083 public void setEcho(boolean echo) {
084 buffer.setEchoing(echo);
085 }
086
087 public TermEvent read() throws IOException {
088
089 //
090 while (true) {
091 int code = io.read();
092 CodeType type = io.decode(code);
093 switch (type) {
094 case CLOSE:
095 return TermEvent.close();
096 case BACKSPACE:
097 buffer.del();
098 break;
099 case UP:
100 case DOWN:
101 int nextHistoryCursor = historyCursor + (type == CodeType.UP ? + 1 : -1);
102 if (nextHistoryCursor >= -1 && nextHistoryCursor < history.size()) {
103 CharSequence s = nextHistoryCursor == -1 ? historyBuffer : history.get(nextHistoryCursor);
104 while (buffer.moveRight()) {
105 // Do nothing
106 }
107 CharSequence t = buffer.replace(s);
108 if (historyCursor == -1) {
109 historyBuffer = t;
110 }
111 if (nextHistoryCursor == -1) {
112 historyBuffer = null;
113 }
114 historyCursor = nextHistoryCursor;
115 }
116 break;
117 case RIGHT:
118 buffer.moveRight();
119 break;
120 case LEFT:
121 buffer.moveLeft();
122 break;
123 case BREAK:
124 log.debug("Want to cancel evaluation");
125 buffer.clear();
126 return TermEvent.brk();
127 case CHAR:
128 if (code >= 0 && code < 128) {
129 buffer.append((char)code);
130 } else {
131 log.debug("Unhandled char " + code);
132 }
133 break;
134 case TAB:
135 log.debug("Tab");
136 return TermEvent.complete(buffer.getBufferToCursor());
137 }
138
139 //
140 if (buffer.hasNext()) {
141 historyCursor = -1;
142 historyBuffer = null;
143 CharSequence input = buffer.next();
144 return TermEvent.readLine(input);
145 }
146 }
147 }
148
149 public Appendable getInsertBuffer() {
150 return buffer;
151 }
152
153 public void addToHistory(CharSequence line) {
154 history.addFirst(line);
155 }
156
157 public CharSequence getBuffer() {
158 return buffer.getBufferToCursor();
159 }
160
161 public void flush() {
162 try {
163 io.flush();
164 }
165 catch (IOException e) {
166 log.debug("Exception thrown during term flush()", e);
167 }
168 }
169
170 public void close() {
171 try {
172 log.debug("Closing connection");
173 io.flush();
174 io.close();
175 } catch (IOException e) {
176 log.debug("Exception thrown during term close()", e);
177 }
178 }
179
180 public Class<Chunk> getConsumedType() {
181 return Chunk.class;
182 }
183
184 public void provide(Chunk element) throws IOException {
185 if (element == null) {
186 throw new NullPointerException("No null chunk accepted");
187 }
188 if (element instanceof Text) {
189 Text textChunk = (Text)element;
190 writer.write(textChunk.getText());
191 } else if (element instanceof Style) {
192 io.write(((Style)element));
193 } else if (element instanceof CLS) {
194 io.cls();
195 } else {
196 throw new UnsupportedOperationException("todo");
197 }
198 }
199 }