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