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