boost/spirit/home/karma/numeric/real.hpp
// 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_REAL_FEB_26_2007_0512PM) #define BOOST_SPIRIT_KARMA_REAL_FEB_26_2007_0512PM #if defined(_MSC_VER) #pragma once #endif #include <boost/config/no_tr1/cmath.hpp> #include <boost/config.hpp> #include <boost/mpl/bool.hpp> #include <boost/utility/enable_if.hpp> #include <boost/spirit/home/support/common_terminals.hpp> #include <boost/spirit/home/support/string_traits.hpp> #include <boost/spirit/home/support/numeric_traits.hpp> #include <boost/spirit/home/support/info.hpp> #include <boost/spirit/home/support/char_class.hpp> #include <boost/spirit/home/support/container.hpp> #include <boost/spirit/home/support/detail/get_encoding.hpp> #include <boost/spirit/home/karma/meta_compiler.hpp> #include <boost/spirit/home/karma/char.hpp> #include <boost/spirit/home/karma/delimit_out.hpp> #include <boost/spirit/home/karma/auxiliary/lazy.hpp> #include <boost/spirit/home/karma/detail/get_casetag.hpp> #include <boost/spirit/home/karma/detail/extract_from.hpp> #include <boost/spirit/home/karma/detail/enable_lit.hpp> #include <boost/spirit/home/karma/domain.hpp> #include <boost/spirit/home/karma/numeric/real_policies.hpp> #include <boost/spirit/home/karma/numeric/detail/real_utils.hpp> #include <boost/fusion/include/at.hpp> #include <boost/fusion/include/value_at.hpp> #include <boost/fusion/include/vector.hpp> namespace boost { namespace spirit { namespace karma { /////////////////////////////////////////////////////////////////////// // forward declaration only template <typename T> struct real_policies; /////////////////////////////////////////////////////////////////////// // This is the class that the user can instantiate directly in // order to create a customized real generator template <typename T = double, typename Policies = real_policies<T> > struct real_generator : spirit::terminal<tag::stateful_tag<Policies, tag::double_, T> > { typedef tag::stateful_tag<Policies, tag::double_, T> tag_type; real_generator() {} real_generator(Policies const& p) : spirit::terminal<tag_type>(p) {} }; } /////////////////////////////////////////////////////////////////////////// // Enablers /////////////////////////////////////////////////////////////////////////// template <> struct use_terminal<karma::domain, tag::float_> // enables float_ : mpl::true_ {}; template <> struct use_terminal<karma::domain, tag::double_> // enables double_ : mpl::true_ {}; template <> struct use_terminal<karma::domain, tag::long_double> // enables long_double : mpl::true_ {}; /////////////////////////////////////////////////////////////////////////// template <> struct use_terminal<karma::domain, float> // enables lit(1.0f) : mpl::true_ {}; template <> struct use_terminal<karma::domain, double> // enables lit(1.0) : mpl::true_ {}; template <> struct use_terminal<karma::domain, long double> // enables lit(1.0l) : mpl::true_ {}; /////////////////////////////////////////////////////////////////////////// template <typename A0> struct use_terminal<karma::domain // enables float_(...) , terminal_ex<tag::float_, fusion::vector1<A0> > > : mpl::true_ {}; template <typename A0> struct use_terminal<karma::domain // enables double_(...) , terminal_ex<tag::double_, fusion::vector1<A0> > > : mpl::true_ {}; template <typename A0> struct use_terminal<karma::domain // enables long_double(...) , terminal_ex<tag::long_double, fusion::vector1<A0> > > : mpl::true_ {}; // lazy float_(...), double_(...), long_double(...) template <> struct use_lazy_terminal<karma::domain, tag::float_, 1> : mpl::true_ {}; template <> struct use_lazy_terminal<karma::domain, tag::double_, 1> : mpl::true_ {}; template <> struct use_lazy_terminal<karma::domain, tag::long_double, 1> : mpl::true_ {}; /////////////////////////////////////////////////////////////////////////// // enables custom real generator template <typename T, typename Policies> struct use_terminal<karma::domain , tag::stateful_tag<Policies, tag::double_, T> > : mpl::true_ {}; template <typename T, typename Policies, typename A0> struct use_terminal<karma::domain , terminal_ex<tag::stateful_tag<Policies, tag::double_, T> , fusion::vector1<A0> > > : mpl::true_ {}; // enables *lazy* custom real generator template <typename T, typename Policies> struct use_lazy_terminal< karma::domain , tag::stateful_tag<Policies, tag::double_, T> , 1 // arity > : mpl::true_ {}; // enables lit(double) template <typename A0> struct use_terminal<karma::domain , terminal_ex<tag::lit, fusion::vector1<A0> > , typename enable_if<traits::is_real<A0> >::type> : mpl::true_ {}; }} /////////////////////////////////////////////////////////////////////////////// namespace boost { namespace spirit { namespace karma { #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS using spirit::float_; using spirit::double_; using spirit::long_double; #endif using spirit::float_type; using spirit::double_type; using spirit::long_double_type; /////////////////////////////////////////////////////////////////////////// // This specialization is used for real generators not having a direct // initializer: float_, double_ etc. These generators must be used in // conjunction with an attribute. /////////////////////////////////////////////////////////////////////////// template < typename T, typename Policies, typename CharEncoding, typename Tag> struct any_real_generator : primitive_generator<any_real_generator<T, Policies, CharEncoding, Tag> > { typedef typename Policies::properties properties; template <typename Context, typename Unused> struct attribute { typedef T type; }; any_real_generator(Policies const& policies = Policies()) : p_(policies) {} // double_/float_/etc. has an attached attribute template <typename OutputIterator, typename Context, typename Delimiter , typename Attribute> bool generate(OutputIterator& sink, Context& context , Delimiter const& d, Attribute const& attr) const { if (!traits::has_optional_value(attr)) return false; // fail if it's an uninitialized optional typedef real_inserter<T, Policies, CharEncoding, Tag> inserter_type; return inserter_type::call(sink, traits::extract_from<T>(attr, context), p_) && karma::delimit_out(sink, d); // always do post-delimiting } // this double_/float_/etc. has no attribute attached, it needs to have // been initialized from a direct literal template <typename OutputIterator, typename Context, typename Delimiter> static bool generate(OutputIterator&, Context&, Delimiter const& , unused_type) { // It is not possible (doesn't make sense) to use numeric generators // without providing any attribute, as the generator doesn't 'know' // what to output. The following assertion fires if this situation // is detected in your code. BOOST_SPIRIT_ASSERT_FAIL(OutputIterator, real_not_usable_without_attribute, ()); return false; } template <typename Context> static info what(Context const& /*context*/) { return info("real"); } Policies p_; }; /////////////////////////////////////////////////////////////////////////// // This specialization is used for real generators having a direct // initializer: float_(10.), double_(20.) etc. /////////////////////////////////////////////////////////////////////////// template < typename T, typename Policies, typename CharEncoding, typename Tag , bool no_attribute> struct literal_real_generator : primitive_generator<literal_real_generator<T, Policies, CharEncoding , Tag, no_attribute> > { typedef typename Policies::properties properties; template <typename Context, typename Unused = unused_type> struct attribute : mpl::if_c<no_attribute, unused_type, T> {}; literal_real_generator(typename add_const<T>::type n , Policies const& policies = Policies()) : n_(n), p_(policies) {} // A double_(1.0) which additionally has an associated attribute emits // its immediate literal only if it matches the attribute, otherwise // it fails. template <typename OutputIterator, typename Context, typename Delimiter , typename Attribute> bool generate(OutputIterator& sink, Context& context , Delimiter const& d, Attribute const& attr) const { typedef typename attribute<Context>::type attribute_type; if (!traits::has_optional_value(attr) || n_ != traits::extract_from<attribute_type>(attr, context)) { return false; } typedef real_inserter<T, Policies, CharEncoding, Tag> inserter_type; return inserter_type::call(sink, n_, p_) && karma::delimit_out(sink, d); // always do post-delimiting } // A double_(1.0) without any associated attribute just emits its // immediate literal template <typename OutputIterator, typename Context, typename Delimiter> bool generate(OutputIterator& sink, Context&, Delimiter const& d , unused_type) const { typedef real_inserter<T, Policies, CharEncoding, Tag> inserter_type; return inserter_type::call(sink, n_, p_) && karma::delimit_out(sink, d); // always do post-delimiting } template <typename Context> static info what(Context const& /*context*/) { return info("real"); } T n_; Policies p_; }; /////////////////////////////////////////////////////////////////////////// // Generator generators: make_xxx function (objects) /////////////////////////////////////////////////////////////////////////// namespace detail { template <typename T, typename Modifiers , typename Policies = real_policies<T> > struct make_real { static bool const lower = has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value; static bool const upper = has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value; typedef any_real_generator< T, Policies , typename spirit::detail::get_encoding_with_case< Modifiers, unused_type, lower || upper>::type , typename detail::get_casetag<Modifiers, lower || upper>::type > result_type; template <typename Terminal> result_type operator()(Terminal const& term, unused_type) const { typedef tag::stateful_tag<Policies, tag::double_, T> tag_type; using spirit::detail::get_stateful_data; return result_type(get_stateful_data<tag_type>::call(term)); } }; } template <typename Modifiers> struct make_primitive<tag::float_, Modifiers> : detail::make_real<float, Modifiers> {}; template <typename Modifiers> struct make_primitive<tag::double_, Modifiers> : detail::make_real<double, Modifiers> {}; template <typename Modifiers> struct make_primitive<tag::long_double, Modifiers> : detail::make_real<long double, Modifiers> {}; /////////////////////////////////////////////////////////////////////////// template <typename T, typename Policies, typename Modifiers> struct make_primitive< tag::stateful_tag<Policies, tag::double_, T>, Modifiers> : detail::make_real<typename remove_const<T>::type , Modifiers, Policies> {}; /////////////////////////////////////////////////////////////////////////// namespace detail { template <typename T, typename Modifiers , typename Policies = real_policies<T> > struct make_real_direct { static bool const lower = has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value; static bool const upper = has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value; typedef literal_real_generator< T, Policies , typename spirit::detail::get_encoding_with_case< Modifiers, unused_type, lower || upper>::type , typename detail::get_casetag<Modifiers, lower || upper>::type , false > result_type; template <typename Terminal> result_type operator()(Terminal const& term, unused_type) const { typedef tag::stateful_tag<Policies, tag::double_, T> tag_type; using spirit::detail::get_stateful_data; return result_type(T(fusion::at_c<0>(term.args)) , get_stateful_data<tag_type>::call(term.term)); } }; } template <typename Modifiers, typename A0> struct make_primitive< terminal_ex<tag::float_, fusion::vector1<A0> >, Modifiers> : detail::make_real_direct<float, Modifiers> {}; template <typename Modifiers, typename A0> struct make_primitive< terminal_ex<tag::double_, fusion::vector1<A0> >, Modifiers> : detail::make_real_direct<double, Modifiers> {}; template <typename Modifiers, typename A0> struct make_primitive< terminal_ex<tag::long_double, fusion::vector1<A0> >, Modifiers> : detail::make_real_direct<long double, Modifiers> {}; /////////////////////////////////////////////////////////////////////////// template <typename T, typename Policies, typename A0, typename Modifiers> struct make_primitive< terminal_ex<tag::stateful_tag<Policies, tag::double_, T> , fusion::vector1<A0> > , Modifiers> : detail::make_real_direct<typename remove_const<T>::type , Modifiers, Policies> {}; /////////////////////////////////////////////////////////////////////////// namespace detail { template <typename T, typename Modifiers> struct basic_real_literal { static bool const lower = has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value; static bool const upper = has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value; typedef literal_real_generator< T, real_policies<T> , typename spirit::detail::get_encoding_with_case< Modifiers, unused_type, lower || upper>::type , typename detail::get_casetag<Modifiers, lower || upper>::type , true > result_type; template <typename T_> result_type operator()(T_ i, unused_type) const { return result_type(T(i)); } }; } template <typename Modifiers> struct make_primitive<float, Modifiers> : detail::basic_real_literal<float, Modifiers> {}; template <typename Modifiers> struct make_primitive<double, Modifiers> : detail::basic_real_literal<double, Modifiers> {}; template <typename Modifiers> struct make_primitive<long double, Modifiers> : detail::basic_real_literal<long double, Modifiers> {}; // lit(double) template <typename Modifiers, typename A0> struct make_primitive< terminal_ex<tag::lit, fusion::vector1<A0> > , Modifiers , typename enable_if<traits::is_real<A0> >::type> { static bool const lower = has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value; static bool const upper = has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value; typedef literal_real_generator< typename remove_const<A0>::type, real_policies<A0> , typename spirit::detail::get_encoding_with_case< Modifiers, unused_type, lower || upper>::type , typename detail::get_casetag<Modifiers, lower || upper>::type , true > result_type; template <typename Terminal> result_type operator()(Terminal const& term, unused_type) const { return result_type(fusion::at_c<0>(term.args)); } }; }}} #endif // defined(BOOST_SPIRIT_KARMA_REAL_FEB_26_2007_0512PM)