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.term.console;
021
022import org.crsh.term.spi.TermIO;
023import org.crsh.text.Style;
024
025import java.io.IOException;
026
027/**
028 * Wraps {@link TermIO} and care about CRLF.
029 */
030class 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}