filter_reader.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2007-2010 SoftPLC Corporation, Dick Hollenbeck <[email protected]>
 * Copyright (C) 2007-2021 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU 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 General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#include <cstring>
#include <filter_reader.h>
#include <richio.h>
 
 
FILTER_READER::FILTER_READER( LINE_READER& aReader ) :
 LINE_READER( 1 ),
 reader( aReader )
{
 // Not using our own m_line buffer, will be using aReader's. This changes
 // the meaning of this->m_line to be merely a pointer to aReader's m_line, which of course
 // is not owned here.
 delete [] m_line;
 
 m_line = nullptr;
}
 
 
FILTER_READER::~FILTER_READER()
{
 // Our 'm_line' points to aReader's, and he will delete that buffer.
 // Prevent subsequent call to ~LINE_READER() from deleting a buffer we do not own.
 m_line = nullptr;
}
 
 
char* FILTER_READER::ReadLine()
{
 char* s;
 
 while( ( s = reader.ReadLine() ) != nullptr )
 {
 if( !strchr( "#\n\r", s[0] ) )
 break;
 }
 
 m_line = reader.Line();
 m_length = reader.Length();
 
 return m_length ? m_line : nullptr;
}
 
 
WHITESPACE_FILTER_READER::WHITESPACE_FILTER_READER( LINE_READER& aReader ) :
 LINE_READER( 1 ),
 reader( aReader )
{
 // Not using our own m_line buffer, will be using aReader's. This changes
 // the meaning of this->m_line to be merely a pointer to aReader's m_line, which of course
 // is not owned here.
 delete [] m_line;
 
 m_line = nullptr;
}
 
 
WHITESPACE_FILTER_READER::~WHITESPACE_FILTER_READER()
{
 // Our 'm_line' points to aReader's, and he will delete that buffer.
 // Prevent subsequent call to ~LINE_READER() from deleting a buffer we do not own.
 m_line = nullptr;
}
 
 
char* WHITESPACE_FILTER_READER::ReadLine()
{
 char* s;
 
 while( ( s = reader.ReadLine() ) != nullptr )
 {
 while( s != nullptr && strchr( " \t", *s ) )
 s++;
 
 if( s != nullptr && !strchr( "#\n\r", *s ) )
 break;
 }
 
 m_line = s;
 m_length = reader.Length();
 
 return m_length ? m_line : nullptr;
}