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    }