Chris@16: //  Copyright (c) 2001-2011 Hartmut Kaiser
Chris@16: //
Chris@16: //  Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #if !defined(BOOST_SPIRIT_KARMA_REAL_FEB_26_2007_0512PM)
Chris@16: #define BOOST_SPIRIT_KARMA_REAL_FEB_26_2007_0512PM
Chris@16: 
Chris@16: #if defined(_MSC_VER)
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/config/no_tr1/cmath.hpp>
Chris@16: #include <boost/config.hpp>
Chris@16: #include <boost/mpl/bool.hpp>
Chris@16: #include <boost/utility/enable_if.hpp>
Chris@16: #include <boost/spirit/home/support/common_terminals.hpp>
Chris@16: #include <boost/spirit/home/support/string_traits.hpp>
Chris@16: #include <boost/spirit/home/support/numeric_traits.hpp>
Chris@16: #include <boost/spirit/home/support/info.hpp>
Chris@16: #include <boost/spirit/home/support/char_class.hpp>
Chris@16: #include <boost/spirit/home/support/container.hpp>
Chris@16: #include <boost/spirit/home/support/detail/get_encoding.hpp>
Chris@16: #include <boost/spirit/home/karma/meta_compiler.hpp>
Chris@16: #include <boost/spirit/home/karma/char.hpp>
Chris@16: #include <boost/spirit/home/karma/delimit_out.hpp>
Chris@16: #include <boost/spirit/home/karma/auxiliary/lazy.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/get_casetag.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/extract_from.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/enable_lit.hpp>
Chris@16: #include <boost/spirit/home/karma/domain.hpp>
Chris@16: #include <boost/spirit/home/karma/numeric/real_policies.hpp>
Chris@16: #include <boost/spirit/home/karma/numeric/detail/real_utils.hpp>
Chris@16: #include <boost/fusion/include/at.hpp>
Chris@16: #include <boost/fusion/include/value_at.hpp>
Chris@16: #include <boost/fusion/include/vector.hpp>
Chris@16: 
Chris@16: namespace boost { namespace spirit
Chris@16: {
Chris@16:     namespace karma
Chris@16:     {
Chris@16:         ///////////////////////////////////////////////////////////////////////
Chris@16:         // forward declaration only
Chris@16:         template <typename T>
Chris@16:         struct real_policies;
Chris@16: 
Chris@16:         ///////////////////////////////////////////////////////////////////////
Chris@16:         // This is the class that the user can instantiate directly in
Chris@16:         // order to create a customized real generator
Chris@16:         template <typename T = double, typename Policies = real_policies<T> >
Chris@16:         struct real_generator
Chris@16:           : spirit::terminal<tag::stateful_tag<Policies, tag::double_, T> >
Chris@16:         {
Chris@16:             typedef tag::stateful_tag<Policies, tag::double_, T> tag_type;
Chris@16: 
Chris@16:             real_generator() {}
Chris@16:             real_generator(Policies const& p)
Chris@16:               : spirit::terminal<tag_type>(p) {}
Chris@16:         };
Chris@16:     }
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Enablers
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <>
Chris@16:     struct use_terminal<karma::domain, tag::float_>       // enables float_
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <>
Chris@16:     struct use_terminal<karma::domain, tag::double_>      // enables double_
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <>
Chris@16:     struct use_terminal<karma::domain, tag::long_double>  // enables long_double
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <>
Chris@16:     struct use_terminal<karma::domain, float>             // enables lit(1.0f)
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <>
Chris@16:     struct use_terminal<karma::domain, double>            // enables lit(1.0)
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <>
Chris@16:     struct use_terminal<karma::domain, long double>       // enables lit(1.0l)
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename A0>
Chris@16:     struct use_terminal<karma::domain                   // enables float_(...)
Chris@16:       , terminal_ex<tag::float_, fusion::vector1<A0> >
Chris@16:     > : mpl::true_ {};
Chris@16: 
Chris@16:     template <typename A0>
Chris@16:     struct use_terminal<karma::domain                   // enables double_(...)
Chris@16:       , terminal_ex<tag::double_, fusion::vector1<A0> >
Chris@16:     > : mpl::true_ {};
Chris@16: 
Chris@16:     template <typename A0>
Chris@16:     struct use_terminal<karma::domain                   // enables long_double(...)
Chris@16:       , terminal_ex<tag::long_double, fusion::vector1<A0> >
Chris@16:     > : mpl::true_ {};
Chris@16: 
Chris@16:     // lazy float_(...), double_(...), long_double(...)
Chris@16:     template <>
Chris@16:     struct use_lazy_terminal<karma::domain, tag::float_, 1>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <>
Chris@16:     struct use_lazy_terminal<karma::domain, tag::double_, 1>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <>
Chris@16:     struct use_lazy_terminal<karma::domain, tag::long_double, 1>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // enables custom real generator
Chris@16:     template <typename T, typename Policies>
Chris@16:     struct use_terminal<karma::domain
Chris@16:           , tag::stateful_tag<Policies, tag::double_, T> >
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <typename T, typename Policies, typename A0>
Chris@16:     struct use_terminal<karma::domain
Chris@16:           , terminal_ex<tag::stateful_tag<Policies, tag::double_, T>
Chris@16:           , fusion::vector1<A0> > >
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     // enables *lazy* custom real generator
Chris@16:     template <typename T, typename Policies>
Chris@16:     struct use_lazy_terminal<
Chris@16:         karma::domain
Chris@16:       , tag::stateful_tag<Policies, tag::double_, T>
Chris@16:       , 1 // arity
Chris@16:     > : mpl::true_ {};
Chris@16: 
Chris@16:     // enables lit(double)
Chris@16:     template <typename A0>
Chris@16:     struct use_terminal<karma::domain
Chris@16:           , terminal_ex<tag::lit, fusion::vector1<A0> >
Chris@16:           , typename enable_if<traits::is_real<A0> >::type>
Chris@16:       : mpl::true_ {};
Chris@16: }}
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: namespace boost { namespace spirit { namespace karma
Chris@16: {
Chris@16: #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
Chris@16:     using spirit::float_;
Chris@16:     using spirit::double_;
Chris@16:     using spirit::long_double;
Chris@16: #endif
Chris@16: 
Chris@16:     using spirit::float_type;
Chris@16:     using spirit::double_type;
Chris@16:     using spirit::long_double_type;
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     //  This specialization is used for real generators not having a direct
Chris@16:     //  initializer: float_, double_ etc. These generators must be used in
Chris@16:     //  conjunction with an attribute.
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <
Chris@16:         typename T, typename Policies, typename CharEncoding, typename Tag>
Chris@16:     struct any_real_generator
Chris@16:       : primitive_generator<any_real_generator<T, Policies, CharEncoding, Tag> >
Chris@16:     {
Chris@16:         typedef typename Policies::properties properties;
Chris@16: 
Chris@16:         template <typename Context, typename Unused>
Chris@16:         struct attribute
Chris@16:         {
Chris@16:             typedef T type;
Chris@16:         };
Chris@16: 
Chris@16:         any_real_generator(Policies const& policies = Policies())
Chris@16:           : p_(policies) {}
Chris@16: 
Chris@16:         // double_/float_/etc. has an attached attribute
Chris@16:         template <typename OutputIterator, typename Context, typename Delimiter
Chris@16:           , typename Attribute>
Chris@16:         bool generate(OutputIterator& sink, Context& context
Chris@16:           , Delimiter const& d, Attribute const& attr) const
Chris@16:         {
Chris@16:             if (!traits::has_optional_value(attr))
Chris@16:                 return false;       // fail if it's an uninitialized optional
Chris@16: 
Chris@16:             typedef real_inserter<T, Policies, CharEncoding, Tag> inserter_type;
Chris@16:             return inserter_type::call(sink, traits::extract_from<T>(attr, context), p_) &&
Chris@16:                    karma::delimit_out(sink, d);    // always do post-delimiting
Chris@16:         }
Chris@16: 
Chris@16:         // this double_/float_/etc. has no attribute attached, it needs to have
Chris@16:         // been initialized from a direct literal
Chris@16:         template <typename OutputIterator, typename Context, typename Delimiter>
Chris@16:         static bool generate(OutputIterator&, Context&, Delimiter const&
Chris@16:           , unused_type)
Chris@16:         {
Chris@16:             // It is not possible (doesn't make sense) to use numeric generators
Chris@16:             // without providing any attribute, as the generator doesn't 'know'
Chris@16:             // what to output. The following assertion fires if this situation
Chris@16:             // is detected in your code.
Chris@16:             BOOST_SPIRIT_ASSERT_FAIL(OutputIterator, real_not_usable_without_attribute, ());
Chris@16:             return false;
Chris@16:         }
Chris@16: 
Chris@16:         template <typename Context>
Chris@16:         static info what(Context const& /*context*/)
Chris@16:         {
Chris@16:             return info("real");
Chris@16:         }
Chris@16: 
Chris@16:         Policies p_;
Chris@16:     };
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     //  This specialization is used for real generators having a direct
Chris@16:     //  initializer: float_(10.), double_(20.) etc.
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <
Chris@16:         typename T, typename Policies, typename CharEncoding, typename Tag
Chris@16:       , bool no_attribute>
Chris@16:     struct literal_real_generator
Chris@16:       : primitive_generator<literal_real_generator<T, Policies, CharEncoding
Chris@16:           , Tag, no_attribute> >
Chris@16:     {
Chris@16:         typedef typename Policies::properties properties;
Chris@16: 
Chris@16:         template <typename Context, typename Unused = unused_type>
Chris@16:         struct attribute
Chris@16:           : mpl::if_c<no_attribute, unused_type, T>
Chris@16:         {};
Chris@16: 
Chris@16:         literal_real_generator(typename add_const<T>::type n
Chris@16:               , Policies const& policies = Policies())
Chris@16:           : n_(n), p_(policies) {}
Chris@16: 
Chris@16:         // A double_(1.0) which additionally has an associated attribute emits
Chris@16:         // its immediate literal only if it matches the attribute, otherwise
Chris@16:         // it fails.
Chris@16:         template <typename OutputIterator, typename Context, typename Delimiter
Chris@16:           , typename Attribute>
Chris@16:         bool generate(OutputIterator& sink, Context& context
Chris@16:           , Delimiter const& d, Attribute const& attr) const
Chris@16:         {
Chris@16:             typedef typename attribute<Context>::type attribute_type;
Chris@16:             if (!traits::has_optional_value(attr) ||
Chris@16:                 n_ != traits::extract_from<attribute_type>(attr, context))
Chris@16:             {
Chris@16:                 return false;
Chris@16:             }
Chris@16: 
Chris@16:             typedef real_inserter<T, Policies, CharEncoding, Tag> inserter_type;
Chris@16:             return inserter_type::call(sink, n_, p_) &&
Chris@16:                    karma::delimit_out(sink, d);    // always do post-delimiting
Chris@16:         }
Chris@16: 
Chris@16:         // A double_(1.0) without any associated attribute just emits its
Chris@16:         // immediate literal
Chris@16:         template <typename OutputIterator, typename Context, typename Delimiter>
Chris@16:         bool generate(OutputIterator& sink, Context&, Delimiter const& d
Chris@16:           , unused_type) const
Chris@16:         {
Chris@16:             typedef real_inserter<T, Policies, CharEncoding, Tag> inserter_type;
Chris@16:             return inserter_type::call(sink, n_, p_) &&
Chris@16:                    karma::delimit_out(sink, d);    // always do post-delimiting
Chris@16:         }
Chris@16: 
Chris@16:         template <typename Context>
Chris@16:         static info what(Context const& /*context*/)
Chris@16:         {
Chris@16:             return info("real");
Chris@16:         }
Chris@16: 
Chris@16:         T n_;
Chris@16:         Policies p_;
Chris@16:     };
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Generator generators: make_xxx function (objects)
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     namespace detail
Chris@16:     {
Chris@16:         template <typename T, typename Modifiers
Chris@16:           , typename Policies = real_policies<T> >
Chris@16:         struct make_real
Chris@16:         {
Chris@16:             static bool const lower =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value;
Chris@16:             static bool const upper =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value;
Chris@16: 
Chris@16:             typedef any_real_generator<
Chris@16:                 T, Policies
Chris@16:               , typename spirit::detail::get_encoding_with_case<
Chris@16:                     Modifiers, unused_type, lower || upper>::type
Chris@16:               , typename detail::get_casetag<Modifiers, lower || upper>::type
Chris@16:             > result_type;
Chris@16: 
Chris@16:             template <typename Terminal>
Chris@16:             result_type operator()(Terminal const& term, unused_type) const
Chris@16:             {
Chris@16:                 typedef tag::stateful_tag<Policies, tag::double_, T> tag_type;
Chris@16:                 using spirit::detail::get_stateful_data;
Chris@16:                 return result_type(get_stateful_data<tag_type>::call(term));
Chris@16:             }
Chris@16:         };
Chris@16:     }
Chris@16: 
Chris@16:     template <typename Modifiers>
Chris@16:     struct make_primitive<tag::float_, Modifiers>
Chris@16:       : detail::make_real<float, Modifiers> {};
Chris@16: 
Chris@16:     template <typename Modifiers>
Chris@16:     struct make_primitive<tag::double_, Modifiers>
Chris@16:       : detail::make_real<double, Modifiers> {};
Chris@16: 
Chris@16:     template <typename Modifiers>
Chris@16:     struct make_primitive<tag::long_double, Modifiers>
Chris@16:       : detail::make_real<long double, Modifiers> {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename T, typename Policies, typename Modifiers>
Chris@16:     struct make_primitive<
Chris@16:             tag::stateful_tag<Policies, tag::double_, T>, Modifiers>
Chris@16:       : detail::make_real<typename remove_const<T>::type
Chris@16:           , Modifiers, Policies> {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     namespace detail
Chris@16:     {
Chris@16:         template <typename T, typename Modifiers
Chris@16:           , typename Policies = real_policies<T> >
Chris@16:         struct make_real_direct
Chris@16:         {
Chris@16:             static bool const lower =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value;
Chris@16:             static bool const upper =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value;
Chris@16: 
Chris@16:             typedef literal_real_generator<
Chris@16:                 T, Policies
Chris@16:               , typename spirit::detail::get_encoding_with_case<
Chris@16:                     Modifiers, unused_type, lower || upper>::type
Chris@16:               , typename detail::get_casetag<Modifiers, lower || upper>::type
Chris@16:               , false
Chris@16:             > result_type;
Chris@16: 
Chris@16:             template <typename Terminal>
Chris@16:             result_type operator()(Terminal const& term, unused_type) const
Chris@16:             {
Chris@16:                 typedef tag::stateful_tag<Policies, tag::double_, T> tag_type;
Chris@16:                 using spirit::detail::get_stateful_data;
Chris@16:                 return result_type(T(fusion::at_c<0>(term.args))
Chris@16:                   , get_stateful_data<tag_type>::call(term.term));
Chris@16:             }
Chris@16:         };
Chris@16:     }
Chris@16: 
Chris@16:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:         terminal_ex<tag::float_, fusion::vector1<A0> >, Modifiers>
Chris@16:       : detail::make_real_direct<float, Modifiers> {};
Chris@16: 
Chris@16:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:         terminal_ex<tag::double_, fusion::vector1<A0> >, Modifiers>
Chris@16:       : detail::make_real_direct<double, Modifiers> {};
Chris@16: 
Chris@16:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:         terminal_ex<tag::long_double, fusion::vector1<A0> >, Modifiers>
Chris@16:       : detail::make_real_direct<long double, Modifiers> {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename T, typename Policies, typename A0, typename Modifiers>
Chris@16:     struct make_primitive<
Chris@16:         terminal_ex<tag::stateful_tag<Policies, tag::double_, T>
Chris@16:           , fusion::vector1<A0> >
Chris@16:           , Modifiers>
Chris@16:       : detail::make_real_direct<typename remove_const<T>::type
Chris@16:           , Modifiers, Policies> {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     namespace detail
Chris@16:     {
Chris@16:         template <typename T, typename Modifiers>
Chris@16:         struct basic_real_literal
Chris@16:         {
Chris@16:             static bool const lower =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value;
Chris@16:             static bool const upper =
Chris@16:                 has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value;
Chris@16: 
Chris@16:             typedef literal_real_generator<
Chris@16:                 T, real_policies<T>
Chris@16:               , typename spirit::detail::get_encoding_with_case<
Chris@16:                     Modifiers, unused_type, lower || upper>::type
Chris@16:               , typename detail::get_casetag<Modifiers, lower || upper>::type
Chris@16:               , true
Chris@16:             > result_type;
Chris@16: 
Chris@16:             template <typename T_>
Chris@16:             result_type operator()(T_ i, unused_type) const
Chris@16:             {
Chris@16:                 return result_type(T(i));
Chris@16:             }
Chris@16:         };
Chris@16:     }
Chris@16: 
Chris@16:     template <typename Modifiers>
Chris@16:     struct make_primitive<float, Modifiers>
Chris@16:       : detail::basic_real_literal<float, Modifiers> {};
Chris@16: 
Chris@16:     template <typename Modifiers>
Chris@16:     struct make_primitive<double, Modifiers>
Chris@16:       : detail::basic_real_literal<double, Modifiers> {};
Chris@16: 
Chris@16:     template <typename Modifiers>
Chris@16:     struct make_primitive<long double, Modifiers>
Chris@16:       : detail::basic_real_literal<long double, Modifiers> {};
Chris@16: 
Chris@16:     // lit(double)
Chris@16:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:             terminal_ex<tag::lit, fusion::vector1<A0> >
Chris@16:           , Modifiers
Chris@16:           , typename enable_if<traits::is_real<A0> >::type>
Chris@16:     {
Chris@16:         static bool const lower =
Chris@16:             has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value;
Chris@16:         static bool const upper =
Chris@16:             has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value;
Chris@16: 
Chris@16:         typedef literal_real_generator<
Chris@16:             typename remove_const<A0>::type, real_policies<A0>
Chris@16:           , typename spirit::detail::get_encoding_with_case<
Chris@16:                 Modifiers, unused_type, lower || upper>::type
Chris@16:           , typename detail::get_casetag<Modifiers, lower || upper>::type
Chris@16:           , true
Chris@16:         > result_type;
Chris@16: 
Chris@16:         template <typename Terminal>
Chris@16:         result_type operator()(Terminal const& term, unused_type) const
Chris@16:         {
Chris@16:             return result_type(fusion::at_c<0>(term.args));
Chris@16:         }
Chris@16:     };
Chris@16: }}}
Chris@16: 
Chris@16: #endif // defined(BOOST_SPIRIT_KARMA_REAL_FEB_26_2007_0512PM)