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.spi.TermIO;
023 import org.crsh.text.Style;
024
025 import java.io.IOException;
026
027 /**
028 * Wraps {@link TermIO} and care about CRLF.
029 */
030 class TermIOWriter {
031
032 /** . */
033 private boolean previousCR;
034
035 /** . */
036 private final TermIO io;
037
038 protected TermIOWriter(TermIO io) {
039 this.io = io;
040 }
041
042 /**
043 * Write a char sequence to the output.
044 *
045 * @param s the char sequence
046 * @throws IOException any io exception
047 */
048 void write(CharSequence s) throws IOException {
049 int len = s.length();
050 if (len > 0) {
051 for (int i = 0;i < len;i++) {
052 char c = s.charAt(i);
053 writeNoFlush(c);
054 }
055 }
056 }
057
058 /**
059 * Write a single char to the output.
060 *
061 * @param c the char to write
062 * @throws IOException any io exception
063 */
064 void write(char c) throws IOException {
065 writeNoFlush(c);
066 }
067
068 private void writeNoFlush(char c) throws IOException {
069 if (previousCR && c == '\n') {
070 previousCR = false;
071 } else if (c == '\r' || c == '\n') {
072 previousCR = c == '\r';
073 io.writeCRLF();
074 } else {
075 io.write(c);
076 }
077 }
078 }