/*=============================================================================
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Copyright (c) 2002 Juan Carlos Arevalo-Baeza
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Copyright (c) 2002-2006 Hartmut Kaiser
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Copyright (c) 2003 Giovanni Bajo
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http://spirit.sourceforge.net/
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Use, modification and distribution is subject to the Boost Software
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License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef BOOST_SPIRIT_CLASSIC_ITERATOR_IMPL_POSITION_ITERATOR_IPP
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#define BOOST_SPIRIT_CLASSIC_ITERATOR_IMPL_POSITION_ITERATOR_IPP
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#include <boost/config.hpp>
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#include <boost/iterator_adaptors.hpp>
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#include <boost/type_traits/add_const.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/spirit/home/classic/core/nil.hpp> // for nil_t
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#include <iterator> // for std::iterator_traits
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namespace boost { namespace spirit {
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BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
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///////////////////////////////////////////////////////////////////////////////
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//
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// position_policy<file_position_without_column>
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//
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// Specialization to handle file_position_without_column. Only take care of
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// newlines since no column tracking is needed.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename String>
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class position_policy<file_position_without_column_base<String> > {
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public:
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void next_line(file_position_without_column_base<String>& pos)
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{
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++pos.line;
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}
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void set_tab_chars(unsigned int /*chars*/){}
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void next_char(file_position_without_column_base<String>& /*pos*/) {}
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void tabulation(file_position_without_column_base<String>& /*pos*/) {}
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// position_policy<file_position>
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//
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// Specialization to handle file_position. Track characters and tabulation
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// to compute the current column correctly.
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//
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// Default tab size is 4. You can change this with the set_tabchars member
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// of position_iterator.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename String>
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class position_policy<file_position_base<String> > {
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public:
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position_policy()
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: m_CharsPerTab(4)
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{}
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void next_line(file_position_base<String>& pos)
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{
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++pos.line;
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pos.column = 1;
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}
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void set_tab_chars(unsigned int chars)
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{
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m_CharsPerTab = chars;
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}
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void next_char(file_position_base<String>& pos)
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{
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++pos.column;
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}
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void tabulation(file_position_base<String>& pos)
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{
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pos.column += m_CharsPerTab - (pos.column - 1) % m_CharsPerTab;
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}
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private:
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unsigned int m_CharsPerTab;
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};
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/* namespace boost::spirit { */ namespace iterator_ { namespace impl {
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template <typename T>
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struct make_const : boost::add_const<T>
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{};
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template <typename T>
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struct make_const<T&>
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{
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typedef typename boost::add_const<T>::type& type;
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// position_iterator_base_generator
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//
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// Metafunction to generate the iterator type using boost::iterator_adaptors,
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// hiding all the metaprogramming thunking code in it. It is used
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// mainly to keep the public interface (position_iterator) cleanear.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename MainIterT, typename ForwardIterT, typename PositionT>
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struct position_iterator_base_generator
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{
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private:
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typedef std::iterator_traits<ForwardIterT> traits;
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typedef typename traits::value_type value_type;
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typedef typename traits::iterator_category iter_category_t;
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typedef typename traits::reference reference;
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// Position iterator is always a non-mutable iterator
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typedef typename boost::add_const<value_type>::type const_value_type;
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public:
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// Check if the MainIterT is nil. If it's nil, it means that the actual
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// self type is position_iterator. Otherwise, it's a real type we
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// must use
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typedef typename boost::mpl::if_<
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typename boost::is_same<MainIterT, nil_t>::type,
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position_iterator<ForwardIterT, PositionT, nil_t>,
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MainIterT
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>::type main_iter_t;
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typedef boost::iterator_adaptor<
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main_iter_t,
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ForwardIterT,
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const_value_type,
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boost::forward_traversal_tag,
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typename make_const<reference>::type
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> type;
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};
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}}
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BOOST_SPIRIT_CLASSIC_NAMESPACE_END
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}} /* namespace boost::spirit::iterator_::impl */
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#endif
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