/*============================================================================= | |
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* 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 | |
{ | |
using spirit::float_; | |
using spirit::float__type; | |
using spirit::double_; | |
using spirit::double__type; | |
using spirit::long_double; | |
using spirit::long_double_type; | |
using spirit::lit; // lit(1.0) is equivalent to 1.0 | |
/////////////////////////////////////////////////////////////////////////// | |
// 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) 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"); | |
} | |
}; | |
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& context, Skipper const& skipper | |
, Attribute& attr) const | |
{ | |
typedef detail::real_impl<T, RealPolicies> extract; | |
qi::skip_over(first, last, skipper); | |
T attr_; | |
if (extract::parse(first, last, attr_, RealPolicies()) && | |
(attr_ == n_)) | |
{ | |
traits::assign_to(attr_, attr); | |
return true; | |
} | |
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 |