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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
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_INFO_NOVEMBER_22_2008_1132AM)
#define BOOST_SPIRIT_INFO_NOVEMBER_22_2008_1132AM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/variant/variant.hpp>
#include <boost/variant/recursive_variant.hpp>
#include <boost/variant/apply_visitor.hpp>
#include <boost/foreach.hpp>
#include <boost/spirit/home/support/utf8.hpp>
#include <list>
#include <iterator>
#include <utility>
namespace boost { namespace spirit
{
// info provides information about a component. Each component
// has a what member function that returns an info object.
// strings in the info object are assumed to be encoded as UTF8
// for uniformity.
struct info
{
struct nil {};
typedef
boost::variant<
nil
, utf8_string
, recursive_wrapper<info>
, recursive_wrapper<std::pair<info, info> >
, recursive_wrapper<std::list<info> >
>
value_type;
explicit info(utf8_string const& tag)
: tag(tag), value(nil()) {}
template <typename T>
info(utf8_string const& tag, T const& value)
: tag(tag), value(value) {}
info(utf8_string const& tag, char value)
: tag(tag), value(utf8_string(1, value)) {}
info(utf8_string const& tag, wchar_t value)
: tag(tag), value(to_utf8(value)) {}
info(utf8_string const& tag, ucs4_char value)
: tag(tag), value(to_utf8(value)) {}
template <typename Char>
info(utf8_string const& tag, Char const* str)
: tag(tag), value(to_utf8(str)) {}
template <typename Char, typename Traits, typename Allocator>
info(utf8_string const& tag
, std::basic_string<Char, Traits, Allocator> const& str)
: tag(tag), value(to_utf8(str)) {}
utf8_string tag;
value_type value;
};
template <typename Callback>
struct basic_info_walker
{
typedef void result_type;
typedef basic_info_walker<Callback> this_type;
basic_info_walker(Callback& callback, utf8_string const& tag, int depth)
: callback(callback), tag(tag), depth(depth) {}
void operator()(info::nil) const
{
callback.element(tag, "", depth);
}
void operator()(utf8_string const& str) const
{
callback.element(tag, str, depth);
}
void operator()(info const& what) const
{
boost::apply_visitor(
this_type(callback, what.tag, depth+1), what.value);
}
void operator()(std::pair<info, info> const& pair) const
{
callback.element(tag, "", depth);
boost::apply_visitor(
this_type(callback, pair.first.tag, depth+1), pair.first.value);
boost::apply_visitor(
this_type(callback, pair.second.tag, depth+1), pair.second.value);
}
void operator()(std::list<info> const& l) const
{
callback.element(tag, "", depth);
BOOST_FOREACH(info const& what, l)
{
boost::apply_visitor(
this_type(callback, what.tag, depth+1), what.value);
}
}
Callback& callback;
utf8_string const& tag;
int depth;
private:
// silence MSVC warning C4512: assignment operator could not be generated
basic_info_walker& operator= (basic_info_walker const&);
};
// bare-bones print support
template <typename Out>
struct simple_printer
{
typedef utf8_string string;
simple_printer(Out& out)
: out(out) {}
void element(string const& tag, string const& value, int /*depth*/) const
{
if (value == "")
out << '<' << tag << '>';
else
out << '"' << value << '"';
}
Out& out;
private:
// silence MSVC warning C4512: assignment operator could not be generated
simple_printer& operator= (simple_printer const&);
};
template <typename Out>
Out& operator<<(Out& out, info const& what)
{
simple_printer<Out> pr(out);
basic_info_walker<simple_printer<Out> > walker(pr, what.tag, 0);
boost::apply_visitor(walker, what.value);
return out;
}
}}
#endif
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Swift