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