src/XSLT/OutputContextStack.cpp

/*
 * The Apache Software License, Version 1.1
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 * Copyright (c) 1999-2000 The Apache Software Foundation.  All rights 
 * reserved.
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 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 * 2. Redistributions in binary form must reproduce the above copyright
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.ibm.com.  For more
 * information on the Apache Software Foundation, please see
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 */

// Class header file...
#include "OutputContextStack.hpp"



#include <PlatformSupport/DOMStringHelper.hpp>



OutputContextStack::OutputContextStack() :
	m_stack(1),
	m_stackPosition(m_stack.begin())
{
	// m_stack is initialized to a size of 1, so that
	// we always have a dummy entry at the beginning
	// of the deque.  This makes the implementation
	// much simpler.
}



OutputContextStack::~OutputContextStack()
{
}



void
OutputContextStack::pushContext(FormatterListener*	theListener)
{
	++m_stackPosition;

	if (m_stackPosition == m_stack.end())
	{
		m_stack.resize(m_stack.size() + 1);

		m_stackPosition = m_stack.end() - 1;
	}

	if (theListener != 0)
	{
		(*m_stackPosition).m_flistener  = theListener;
	}
}



void
OutputContextStack::popContext()
{
	assert(m_stackPosition != m_stack.begin());

	OutputContext&	theCurrentContext = *m_stackPosition;

	theCurrentContext.reset();

	--m_stackPosition;
}



void
OutputContextStack::clear()
{
	// Since we always keep one dummy entry at the beginning,
	// swap with an OutputContextStackType instance of size 1.
	OutputContextStackType(1).swap(m_stack);

	m_stackPosition = m_stack.begin();
}



void
OutputContextStack::reset()
{
	while(m_stackPosition != m_stack.begin())
	{
		popContext();
	}
}