| /*============================================================================= |
| Copyright (c) 2001-2010 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_REAL_APRIL_18_2006_0850AM) |
| #define BOOST_SPIRIT_REAL_APRIL_18_2006_0850AM |
| |
| #if defined(_MSC_VER) |
| #pragma once |
| #endif |
| |
| #include <boost/spirit/home/qi/skip_over.hpp> |
| #include <boost/spirit/home/qi/numeric/real_policies.hpp> |
| #include <boost/spirit/home/qi/numeric/numeric_utils.hpp> |
| #include <boost/spirit/home/qi/numeric/detail/real_impl.hpp> |
| #include <boost/spirit/home/qi/meta_compiler.hpp> |
| #include <boost/spirit/home/qi/parser.hpp> |
| #include <boost/spirit/home/support/common_terminals.hpp> |
| |
| namespace boost { namespace spirit |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| // Enablers |
| /////////////////////////////////////////////////////////////////////////// |
| template <> |
| struct use_terminal<qi::domain, tag::float_> // enables float_ |
| : mpl::true_ {}; |
| |
| template <> |
| struct use_terminal<qi::domain, tag::double_> // enables double_ |
| : mpl::true_ {}; |
| |
| template <> |
| struct use_terminal<qi::domain, tag::long_double> // enables long_double |
| : mpl::true_ {}; |
| }} |
| |
| namespace boost { namespace spirit { namespace qi |
| { |
| using spirit::float_; |
| using spirit::float__type; |
| using spirit::double_; |
| using spirit::double__type; |
| using spirit::long_double; |
| using spirit::long_double_type; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // This is the actual real number parser |
| /////////////////////////////////////////////////////////////////////////// |
| template < |
| typename T = double, |
| typename RealPolicies = real_policies<T> |
| > |
| struct real_parser_impl |
| : primitive_parser<real_parser_impl<T, RealPolicies> > |
| { |
| template <typename Context, typename Iterator> |
| struct attribute |
| { |
| typedef T type; |
| }; |
| |
| template <typename Iterator, typename Context, typename Skipper> |
| bool parse(Iterator& first, Iterator const& last |
| , Context& /*context*/, Skipper const& skipper |
| , T& attr) const |
| { |
| qi::skip_over(first, last, skipper); |
| return detail::real_impl<T, RealPolicies>:: |
| parse(first, last, attr, RealPolicies()); |
| } |
| |
| template <typename Iterator, typename Context |
| , typename Skipper, typename Attribute> |
| bool parse(Iterator& first, Iterator const& last |
| , Context& context, Skipper const& skipper |
| , Attribute& attr_) const |
| { |
| // this case is called when Attribute is not T |
| T attr; |
| if (parse(first, last, context, skipper, attr)) |
| { |
| traits::assign_to(attr, attr_); |
| return true; |
| } |
| return false; |
| } |
| |
| template <typename Context> |
| info what(Context& /*context*/) const |
| { |
| return info("real-number"); |
| } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // This one is the class that the user can instantiate directly |
| /////////////////////////////////////////////////////////////////////////// |
| template < |
| typename T, |
| typename RealPolicies = real_policies<T> |
| > |
| struct real_parser |
| : proto::terminal<real_parser_impl<T, RealPolicies> >::type |
| { |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Parser generators: make_xxx function (objects) |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename T> |
| struct make_real |
| { |
| typedef real_parser_impl<T, real_policies<T> > result_type; |
| result_type operator()(unused_type, unused_type) const |
| { |
| return result_type(); |
| } |
| }; |
| |
| template <typename Modifiers> |
| struct make_primitive<tag::float_, Modifiers> : make_real<float> {}; |
| |
| template <typename Modifiers> |
| struct make_primitive<tag::double_, Modifiers> : make_real<double> {}; |
| |
| template <typename Modifiers> |
| struct make_primitive<tag::long_double, Modifiers> : make_real<long double> {}; |
| }}} |
| |
| #endif |