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Filename : string_generate.hpp
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//  Copyright (c) 2001-2011 Hartmut Kaiser
// 
//  Distributed under the Boost Software License, Version 1.0. (See accompanying 
//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#if !defined(BOOST_SPIRIT_KARMA_STRING_GENERATE_FEB_23_2007_1232PM)
#define BOOST_SPIRIT_KARMA_STRING_GENERATE_FEB_23_2007_1232PM

#if defined(_MSC_VER)
#pragma once
#endif

#include <boost/spirit/home/support/char_class.hpp>
#include <boost/spirit/home/karma/detail/generate_to.hpp>

namespace boost { namespace spirit { namespace karma { namespace detail
{
    ///////////////////////////////////////////////////////////////////////////
    // pass through character transformation
    struct pass_through_filter
    {
        template <typename Char>
        Char operator()(Char ch) const
        {
            return ch;
        }
    };

    template <typename CharEncoding, typename Tag>
    struct encoding_filter
    {
        template <typename Char>
        Char operator()(Char ch) const
        {
            return spirit::char_class::convert<CharEncoding>::to(Tag(), ch);
        }
    };

    ///////////////////////////////////////////////////////////////////////////
    //  generate a string given by a std::string, applying the given filter
    template <typename OutputIterator, typename Char, typename Filter>
    inline bool string_generate(OutputIterator& sink, Char const* str
      , Filter filter)
    {
        for (Char ch = *str; ch != 0; ch = *++str)
        {
            *sink = filter(ch);
            ++sink;
        }
        return detail::sink_is_good(sink);
    }

    template <typename OutputIterator, typename Container, typename Filter>
    inline bool string_generate(OutputIterator& sink
      , Container const& c, Filter filter)
    {
        typedef typename traits::container_iterator<Container const>::type 
            iterator;

        const iterator end = boost::end(c);
        for (iterator it = boost::begin(c); it != end; ++it)
        {
            *sink = filter(*it);
            ++sink;
        }
        return detail::sink_is_good(sink);
    }

    ///////////////////////////////////////////////////////////////////////////
    //  generate a string without any transformation
    template <typename OutputIterator, typename Char>
    inline bool string_generate(OutputIterator& sink, Char const* str)
    {
        return string_generate(sink, str, pass_through_filter());
    }

    template <typename OutputIterator, typename Container>
    inline bool string_generate(OutputIterator& sink
      , Container const& c)
    {
        return string_generate(sink, c, pass_through_filter());
    }

    ///////////////////////////////////////////////////////////////////////////
    //  generate a string given by a pointer, converting according using a 
    //  given character class and case tag
    template <typename OutputIterator, typename Char, typename CharEncoding
      , typename Tag>
    inline bool string_generate(OutputIterator& sink
      , Char const* str
      , CharEncoding, Tag)
    {
        return string_generate(sink, str, encoding_filter<CharEncoding, Tag>());
    }

    template <typename OutputIterator, typename Container
      , typename CharEncoding, typename Tag>
    inline bool 
    string_generate(OutputIterator& sink
      , Container const& c
      , CharEncoding, Tag)
    {
        return string_generate(sink, c, encoding_filter<CharEncoding, Tag>());
    }

    ///////////////////////////////////////////////////////////////////////////
    template <typename OutputIterator, typename Char>
    inline bool string_generate(OutputIterator& sink
      , Char const* str
      , unused_type, unused_type)
    {
        return string_generate(sink, str);
    }

    template <typename OutputIterator, typename Container>
    inline bool string_generate(OutputIterator& sink
      , Container const& c
      , unused_type, unused_type)
    {
        return string_generate(sink, c);
    }

}}}}

#endif