Chris@16: /*=============================================================================
Chris@16:     Copyright (c) 2001-2011 Joel de Guzman
Chris@16:     Copyright (c) 2011      Bryce Lelbach
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_REAL_APRIL_18_2006_0850AM)
Chris@16: #define BOOST_SPIRIT_REAL_APRIL_18_2006_0850AM
Chris@16: 
Chris@16: #if defined(_MSC_VER)
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/spirit/home/qi/skip_over.hpp>
Chris@16: #include <boost/spirit/home/qi/detail/enable_lit.hpp>
Chris@16: #include <boost/spirit/home/qi/meta_compiler.hpp>
Chris@16: #include <boost/spirit/home/qi/parser.hpp>
Chris@16: #include <boost/spirit/home/qi/numeric/real_policies.hpp>
Chris@16: #include <boost/spirit/home/qi/numeric/numeric_utils.hpp>
Chris@16: #include <boost/spirit/home/qi/numeric/detail/real_impl.hpp>
Chris@16: #include <boost/spirit/home/support/common_terminals.hpp>
Chris@16: #include <boost/type_traits/is_same.hpp>
Chris@16: 
Chris@16: namespace boost { namespace spirit
Chris@16: {
Chris@16:     namespace qi
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 parser
Chris@16:         template <typename T = double, typename Policies = real_policies<T> >
Chris@16:         struct real_parser
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_parser() {}
Chris@16:             real_parser(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 <> // enables float_
Chris@16:     struct use_terminal<qi::domain, tag::float_>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <> // enables double_
Chris@16:     struct use_terminal<qi::domain, tag::double_>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <> // enables long_double
Chris@16:     struct use_terminal<qi::domain, tag::long_double>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename A0> // enables lit(n)
Chris@16:     struct use_terminal<qi::domain
Chris@16:         , terminal_ex<tag::lit, fusion::vector1<A0> >
Chris@16:         , typename enable_if<is_same<A0, float> >::type>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <typename A0> // enables lit(n)
Chris@16:     struct use_terminal<qi::domain
Chris@16:         , terminal_ex<tag::lit, fusion::vector1<A0> >
Chris@16:         , typename enable_if<is_same<A0, double> >::type>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <typename A0> // enables lit(n)
Chris@16:     struct use_terminal<qi::domain
Chris@16:         , terminal_ex<tag::lit, fusion::vector1<A0> >
Chris@16:         , typename enable_if<is_same<A0, long double> >::type>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename A0> // enables float_(...)
Chris@16:     struct use_terminal<qi::domain
Chris@16:       , terminal_ex<tag::float_, fusion::vector1<A0> >
Chris@16:     > : mpl::true_ {};
Chris@16: 
Chris@16:     template <typename A0> // enables double_(...)
Chris@16:     struct use_terminal<qi::domain
Chris@16:       , terminal_ex<tag::double_, fusion::vector1<A0> >
Chris@16:     > : mpl::true_ {};
Chris@16: 
Chris@16:     template <typename A0> // enables long_double(...)
Chris@16:     struct use_terminal<qi::domain
Chris@16:       , terminal_ex<tag::long_double, fusion::vector1<A0> >
Chris@16:     > : mpl::true_ {};
Chris@16: 
Chris@16:     template <> // enables *lazy* float_(...)
Chris@16:     struct use_lazy_terminal<qi::domain, tag::float_, 1>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <> // enables *lazy* double_(...)
Chris@16:     struct use_lazy_terminal<qi::domain, tag::double_, 1>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <> // enables *lazy* long_double_(...)
Chris@16:     struct use_lazy_terminal<qi::domain, tag::long_double, 1>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // enables custom real_parser
Chris@16:     template <typename T, typename Policies>
Chris@16:     struct use_terminal<qi::domain
Chris@16:         , tag::stateful_tag<Policies, tag::double_, T> >
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     // enables custom real_parser(...)
Chris@16:     template <typename T, typename Policies, typename A0>
Chris@16:     struct use_terminal<qi::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_parser(...)
Chris@16:     template <typename T, typename Policies>
Chris@16:     struct use_lazy_terminal<
Chris@16:         qi::domain
Chris@16:       , tag::stateful_tag<Policies, tag::double_, T>
Chris@16:       , 1 // arity
Chris@16:     > : mpl::true_ {};
Chris@16: }}
Chris@16: 
Chris@16: namespace boost { namespace spirit { namespace qi
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:     using spirit::lit; // lit(1.0) is equivalent to 1.0
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:     using spirit::lit_type;
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // This is the actual real number parser
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename T, typename RealPolicies = real_policies<T> >
Chris@16:     struct any_real_parser
Chris@16:       : primitive_parser<any_real_parser<T, RealPolicies> >
Chris@16:     {
Chris@16:         template <typename Context, typename Iterator>
Chris@16:         struct attribute
Chris@16:         {
Chris@16:             typedef T type;
Chris@16:         };
Chris@16: 
Chris@16:         template <typename Iterator, typename Context, typename Skipper>
Chris@16:         bool parse(Iterator& first, Iterator const& last
Chris@16:           , Context& /*context*/, Skipper const& skipper
Chris@16:           , T& attr_) const
Chris@16:         {
Chris@16:             typedef detail::real_impl<T, RealPolicies> extract;
Chris@16:             qi::skip_over(first, last, skipper);
Chris@16:             return extract::parse(first, last, attr_, RealPolicies());
Chris@16:         }
Chris@16: 
Chris@16:         template <typename Iterator, typename Context
Chris@16:           , typename Skipper, typename Attribute>
Chris@16:         bool parse(Iterator& first, Iterator const& last
Chris@16:           , Context& context, Skipper const& skipper
Chris@16:           , Attribute& attr_param) const
Chris@16:         {
Chris@16:             // this case is called when Attribute is not T
Chris@16:             T attr_;
Chris@16:             if (parse(first, last, context, skipper, attr_))
Chris@16:             {
Chris@16:                 traits::assign_to(attr_, attr_param);
Chris@16:                 return true;
Chris@16:             }
Chris@16:             return false;
Chris@16:         }
Chris@16: 
Chris@16:         template <typename Context>
Chris@16:         info what(Context& /*context*/) const
Chris@16:         {
Chris@16:             return info("real");
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template <typename T, typename RealPolicies = real_policies<T>
Chris@16:             , bool no_attribute = true>
Chris@16:     struct literal_real_parser
Chris@16:       : primitive_parser<literal_real_parser<T, RealPolicies, no_attribute> >
Chris@16:     {
Chris@16:         template <typename Value>
Chris@16:         literal_real_parser(Value const& n) : n_(n) {}
Chris@16: 
Chris@16:         template <typename Context, typename Iterator>
Chris@16:         struct attribute
Chris@16:           : mpl::if_c<no_attribute, unused_type, T>
Chris@16:         {};
Chris@16: 
Chris@16:         template <typename Iterator, typename Context
Chris@16:           , typename Skipper, typename Attribute>
Chris@16:         bool parse(Iterator& first, Iterator const& last
Chris@101:           , Context&, Skipper const& skipper
Chris@16:           , Attribute& attr_param) const
Chris@16:         {
Chris@16:             typedef detail::real_impl<T, RealPolicies> extract;
Chris@16:             qi::skip_over(first, last, skipper);
Chris@16: 
Chris@16:             Iterator save = first;
Chris@16:             T attr_;
Chris@16: 
Chris@16:             if (extract::parse(first, last, attr_, RealPolicies()) &&
Chris@16:                 (attr_ == n_))
Chris@16:             {
Chris@16:                 traits::assign_to(attr_, attr_param);
Chris@16:                 return true;
Chris@16:             }
Chris@16: 
Chris@16:             first = save;
Chris@16:             return false;
Chris@16:         }
Chris@16: 
Chris@16:         template <typename Context>
Chris@16:         info what(Context& /*context*/) const
Chris@16:         {
Chris@16:             return info("real");
Chris@16:         }
Chris@16: 
Chris@16:         T n_;
Chris@16:     };
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Parser generators: make_xxx function (objects)
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename T, typename Policies = real_policies<T> >
Chris@16:     struct make_real
Chris@16:     {
Chris@16:         typedef any_real_parser<T, Policies> result_type;
Chris@16: 
Chris@16:         result_type operator()(unused_type, unused_type) const
Chris@16:         {
Chris@16:             return result_type();
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template <typename T, typename Policies = real_policies<T> >
Chris@16:     struct make_direct_real
Chris@16:     {
Chris@16:         typedef literal_real_parser<T, Policies, false> 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(T(fusion::at_c<0>(term.args)));
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template <typename T, typename Policies = real_policies<T> >
Chris@16:     struct make_literal_real
Chris@16:     {
Chris@16:         typedef literal_real_parser<T, Policies> 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:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:           terminal_ex<tag::lit, fusion::vector1<A0> >
Chris@16:         , Modifiers, typename enable_if<is_same<A0, float> >::type>
Chris@16:       : make_literal_real<float> {};
Chris@16: 
Chris@16:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:           terminal_ex<tag::lit, fusion::vector1<A0> >
Chris@16:         , Modifiers, typename enable_if<is_same<A0, double> >::type>
Chris@16:       : make_literal_real<double> {};
Chris@16: 
Chris@16:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:           terminal_ex<tag::lit, fusion::vector1<A0> >
Chris@16:         , Modifiers, typename enable_if<is_same<A0, long double> >::type>
Chris@16:       : make_literal_real<long double> {};
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:       : make_real<T, Policies> {};
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> >, Modifiers>
Chris@16:       : make_direct_real<T, Policies> {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Modifiers>
Chris@16:     struct make_primitive<tag::float_, Modifiers>
Chris@16:       : make_real<float> {};
Chris@16: 
Chris@16:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:         terminal_ex<tag::float_
Chris@16:       , fusion::vector1<A0> >, Modifiers>
Chris@16:       : make_direct_real<float> {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Modifiers>
Chris@16:     struct make_primitive<tag::double_, Modifiers>
Chris@16:       : make_real<double> {};
Chris@16: 
Chris@16:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:         terminal_ex<tag::double_
Chris@16:       , fusion::vector1<A0> >, Modifiers>
Chris@16:       : make_direct_real<double> {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Modifiers>
Chris@16:     struct make_primitive<tag::long_double, Modifiers>
Chris@16:       : make_real<long double> {};
Chris@16: 
Chris@16:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:         terminal_ex<tag::long_double
Chris@16:       , fusion::vector1<A0> >, Modifiers>
Chris@16:       : make_direct_real<long double> {};
Chris@16: }}}
Chris@16: 
Chris@16: #endif