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
020package org.crsh.console;
021
022import java.io.IOException;
023
024/**
025 * Wraps {@link org.crsh.telnet.term.spi.TermIO} and care about CRLF.
026 */
027class EditorWriter {
028
029  /** . */
030  private boolean previousCR;
031
032  /** . */
033  private final ConsoleDriver io;
034
035  protected EditorWriter(ConsoleDriver io) {
036    this.io = io;
037  }
038
039  /**
040   * Write a char sequence to the output.
041   *
042   * @param s the char sequence
043   * @throws java.io.IOException any io exception
044   */
045  void write(CharSequence s) throws IOException {
046    int len = s.length();
047    if (len > 0) {
048      for (int i = 0;i < len;i++) {
049        char c = s.charAt(i);
050        writeNoFlush(c);
051      }
052    }
053  }
054
055  /**
056   * Write a single char to the output.
057   *
058   * @param c the char to write
059   * @throws java.io.IOException any io exception
060   */
061  void write(char c) throws IOException {
062    writeNoFlush(c);
063  }
064
065  private void writeNoFlush(char c) throws IOException {
066    if (previousCR && c == '\n') {
067      previousCR = false;
068    } else if (c == '\r' || c == '\n') {
069      previousCR = c == '\r';
070      io.writeCRLF();
071    } else {
072      io.write(c);
073    }
074  }
075}