TerminalCharacterDecoder.cpp

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/*
    This file is part of Konsole, an X terminal.
 
    Copyright (C) 2006, 2013 by Robert Knight <robertknight@gmail.com>
 
    Rewritten for QT4 by e_k <e_k at users.sourceforge.net>, Copyright (C)2008
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301  USA.
*/
 
// Own
#include "unix/TerminalCharacterDecoder.h"
 
// Qt
#include <QtCore/QTextStream>
 
PlainTextDecoder::PlainTextDecoder()
 : _output(nullptr)
 , _includeTrailingWhitespace(true)
{
 
}
void PlainTextDecoder::setTrailingWhitespace(bool enable)
{
    _includeTrailingWhitespace = enable;
}
bool PlainTextDecoder::trailingWhitespace() const
{
    return _includeTrailingWhitespace;
}
void PlainTextDecoder::begin(QTextStream* output)
{
   _output = output;
}
void PlainTextDecoder::end()
{
    _output = nullptr;
}
void PlainTextDecoder::decodeLine(const Character* const characters, int count, LineProperty /*properties*/
               )
{
    Q_ASSERT( _output );
 
  //TODO should we ignore or respect the LINE_WRAPPED line property?
 
  //note:  we build up a QString and send it to the text stream rather writing into the text
  //stream a character at a time because it is more efficient.
  //(since QTextStream always deals with QStrings internally anyway)
  QString plainText;
  plainText.reserve(count);
 
    int outputCount = count;
 
    // if inclusion of trailing whitespace is disabled then find the end of the
    // line
    if ( !_includeTrailingWhitespace )
    {
        for (int i = count-1 ; i >= 0 ; i--)
        {
            if ( characters[i].character != ' '  )
                break;
            else
                outputCount--;
        }
    }
 
  for (int i=0;i<outputCount;i++)
  {
    plainText.append( QChar(characters[i].character) );
  }
 
  *_output << plainText;
}
 
HTMLDecoder::HTMLDecoder() :
        _output(nullptr)
       ,_colorTable(base_color_table)
       ,_innerSpanOpen(false)
       ,_lastRendition(DEFAULT_RENDITION)
{
  
}
 
void HTMLDecoder::begin(QTextStream* output)
{
    _output = output;
 
    QString text;
 
  //open monospace span
    openSpan(text,"font-family:monospace");
 
    *output << text;
}
 
void HTMLDecoder::end()
{
    Q_ASSERT( _output );
 
    QString text;
 
    closeSpan(text);
 
    *_output << text;
 
    _output = nullptr;
 
}
 
//TODO: Support for LineProperty (mainly double width , double height)
void HTMLDecoder::decodeLine(const Character* const characters, int count, LineProperty /*properties*/
              )
{
    Q_ASSERT( _output );
 
  QString text;
 
  int spaceCount = 0;
    
  for (int i=0;i<count;i++)
  {
    QChar ch(characters[i].character);
 
    //check if appearance of character is different from previous char
    if ( characters[i].rendition != _lastRendition  ||
         characters[i].foregroundColor != _lastForeColor  ||
       characters[i].backgroundColor != _lastBackColor )
    {
      if ( _innerSpanOpen )
          closeSpan(text);
 
      _lastRendition = characters[i].rendition;
      _lastForeColor = characters[i].foregroundColor;
      _lastBackColor = characters[i].backgroundColor;
      
      //build up style string
      QString style;
 
      if ( _lastRendition & RE_BOLD ||
                             (_colorTable && characters[i].isBold(_colorTable)) )
          style.append("font-weight:bold;");
 
 
      if ( _lastRendition & RE_UNDERLINE )
          style.append("font-decoration:underline;");
    
      //colours - a colour table must have been defined first
      if ( _colorTable )  
      {
        style.append( QString("color:%1;").arg(_lastForeColor.color(_colorTable).name() ) );
 
        if (!characters[i].isTransparent(_colorTable))
        {
          style.append( QString("background-color:%1;").arg(_lastBackColor.color(_colorTable).name() ) );
        }
      }
    
      //open the span with the current style  
      openSpan(text,style);
      _innerSpanOpen = true;
    }
 
    //handle whitespace
    if (ch.isSpace())
      spaceCount++;
    else
      spaceCount = 0;
    
 
    //output current character
    if (spaceCount < 2)
    {
      //escape HTML tag characters and just display others as they are
      if ( ch == '<' )
        text.append("&lt;");
      else if (ch == '>')
          text.append("&gt;");
      else  
          text.append(ch);
    }
    else
    {
      text.append("&nbsp;"); //HTML truncates multiple spaces, so use a space marker instead
    }
    
  }
 
  //close any remaining open inner spans
  if ( _innerSpanOpen )
    closeSpan(text);
 
  //start new line
  text.append("<br>");
  
  *_output << text;
}
 
void HTMLDecoder::openSpan(QString& text , const QString& style)
{
  text.append( QString("<span style=\"%1\">").arg(style) );
}
 
void HTMLDecoder::closeSpan(QString& text)
{
  text.append("</span>");
}
 
void HTMLDecoder::setColorTable(const ColorEntry* table)
{
  _colorTable = table;
}