343 lines
12 KiB
C++
343 lines
12 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2011 Bryce Lelbach
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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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==============================================================================*/
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#if !defined(BOOST_SPIRIT_REAL_APRIL_18_2006_0850AM)
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#define BOOST_SPIRIT_REAL_APRIL_18_2006_0850AM
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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/spirit/home/qi/skip_over.hpp>
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#include <boost/spirit/home/qi/detail/enable_lit.hpp>
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#include <boost/spirit/home/qi/meta_compiler.hpp>
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#include <boost/spirit/home/qi/parser.hpp>
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#include <boost/spirit/home/qi/numeric/real_policies.hpp>
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#include <boost/spirit/home/qi/numeric/numeric_utils.hpp>
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#include <boost/spirit/home/qi/numeric/detail/real_impl.hpp>
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#include <boost/spirit/home/support/common_terminals.hpp>
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#include <boost/type_traits/is_same.hpp>
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namespace boost { namespace spirit
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{
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namespace qi
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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 parser
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template <typename T = double, typename Policies = real_policies<T> >
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struct real_parser
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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_parser() {}
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real_parser(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 <> // enables float_
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struct use_terminal<qi::domain, tag::float_>
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: mpl::true_ {};
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template <> // enables double_
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struct use_terminal<qi::domain, tag::double_>
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: mpl::true_ {};
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template <> // enables long_double
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struct use_terminal<qi::domain, tag::long_double>
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: mpl::true_ {};
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///////////////////////////////////////////////////////////////////////////
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template <typename A0> // enables lit(n)
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struct use_terminal<qi::domain
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, terminal_ex<tag::lit, fusion::vector1<A0> >
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, typename enable_if<is_same<A0, float> >::type>
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: mpl::true_ {};
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template <typename A0> // enables lit(n)
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struct use_terminal<qi::domain
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, terminal_ex<tag::lit, fusion::vector1<A0> >
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, typename enable_if<is_same<A0, double> >::type>
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: mpl::true_ {};
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template <typename A0> // enables lit(n)
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struct use_terminal<qi::domain
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, terminal_ex<tag::lit, fusion::vector1<A0> >
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, typename enable_if<is_same<A0, long double> >::type>
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: mpl::true_ {};
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///////////////////////////////////////////////////////////////////////////
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template <typename A0> // enables float_(...)
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struct use_terminal<qi::domain
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, terminal_ex<tag::float_, fusion::vector1<A0> >
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> : mpl::true_ {};
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template <typename A0> // enables double_(...)
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struct use_terminal<qi::domain
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, terminal_ex<tag::double_, fusion::vector1<A0> >
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> : mpl::true_ {};
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template <typename A0> // enables long_double(...)
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struct use_terminal<qi::domain
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, terminal_ex<tag::long_double, fusion::vector1<A0> >
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> : mpl::true_ {};
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template <> // enables *lazy* float_(...)
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struct use_lazy_terminal<qi::domain, tag::float_, 1>
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: mpl::true_ {};
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template <> // enables *lazy* double_(...)
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struct use_lazy_terminal<qi::domain, tag::double_, 1>
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: mpl::true_ {};
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template <> // enables *lazy* long_double_(...)
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struct use_lazy_terminal<qi::domain, tag::long_double, 1>
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: mpl::true_ {};
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///////////////////////////////////////////////////////////////////////////
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// enables custom real_parser
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template <typename T, typename Policies>
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struct use_terminal<qi::domain
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, tag::stateful_tag<Policies, tag::double_, T> >
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: mpl::true_ {};
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// enables custom real_parser(...)
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template <typename T, typename Policies, typename A0>
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struct use_terminal<qi::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_parser(...)
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template <typename T, typename Policies>
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struct use_lazy_terminal<
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qi::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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}}
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namespace boost { namespace spirit { namespace qi
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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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using spirit::lit; // lit(1.0) is equivalent to 1.0
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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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using spirit::lit_type;
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///////////////////////////////////////////////////////////////////////////
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// This is the actual real number parser
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///////////////////////////////////////////////////////////////////////////
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template <typename T, typename RealPolicies = real_policies<T> >
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struct any_real_parser
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: primitive_parser<any_real_parser<T, RealPolicies> >
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{
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template <typename Context, typename Iterator>
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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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template <typename Iterator, typename Context, typename Skipper>
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bool parse(Iterator& first, Iterator const& last
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, Context& /*context*/, Skipper const& skipper
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, T& attr_) const
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{
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typedef detail::real_impl<T, RealPolicies> extract;
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qi::skip_over(first, last, skipper);
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return extract::parse(first, last, attr_, RealPolicies());
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}
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template <typename Iterator, typename Context
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, typename Skipper, typename Attribute>
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bool parse(Iterator& first, Iterator const& last
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, Context& context, Skipper const& skipper
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, Attribute& attr_param) const
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{
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// this case is called when Attribute is not T
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T attr_;
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if (parse(first, last, context, skipper, attr_))
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{
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traits::assign_to(attr_, attr_param);
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return true;
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}
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return false;
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}
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template <typename Context>
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info what(Context& /*context*/) const
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{
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return info("real");
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}
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};
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template <typename T, typename RealPolicies = real_policies<T>
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, bool no_attribute = true>
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struct literal_real_parser
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: primitive_parser<literal_real_parser<T, RealPolicies, no_attribute> >
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{
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template <typename Value>
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literal_real_parser(Value const& n) : n_(n) {}
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template <typename Context, typename Iterator>
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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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template <typename Iterator, typename Context
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, typename Skipper, typename Attribute>
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bool parse(Iterator& first, Iterator const& last
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, Context&, Skipper const& skipper
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, Attribute& attr_param) const
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{
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typedef detail::real_impl<T, RealPolicies> extract;
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qi::skip_over(first, last, skipper);
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Iterator save = first;
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T attr_;
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if (extract::parse(first, last, attr_, RealPolicies()) &&
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(attr_ == n_))
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{
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traits::assign_to(attr_, attr_param);
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return true;
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}
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first = save;
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return false;
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}
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template <typename Context>
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info what(Context& /*context*/) const
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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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};
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///////////////////////////////////////////////////////////////////////////
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// Parser generators: make_xxx function (objects)
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///////////////////////////////////////////////////////////////////////////
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template <typename T, typename Policies = real_policies<T> >
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struct make_real
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{
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typedef any_real_parser<T, Policies> result_type;
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result_type operator()(unused_type, unused_type) const
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{
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return result_type();
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}
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};
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template <typename T, typename Policies = real_policies<T> >
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struct make_direct_real
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{
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typedef literal_real_parser<T, Policies, false> 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(T(fusion::at_c<0>(term.args)));
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}
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};
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template <typename T, typename Policies = real_policies<T> >
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struct make_literal_real
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{
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typedef literal_real_parser<T, Policies> 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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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, typename enable_if<is_same<A0, float> >::type>
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: make_literal_real<float> {};
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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, typename enable_if<is_same<A0, double> >::type>
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: make_literal_real<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, typename enable_if<is_same<A0, long double> >::type>
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: make_literal_real<long double> {};
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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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: make_real<T, Policies> {};
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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> >, Modifiers>
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: make_direct_real<T, Policies> {};
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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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: make_real<float> {};
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template <typename Modifiers, typename A0>
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struct make_primitive<
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terminal_ex<tag::float_
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, fusion::vector1<A0> >, Modifiers>
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: make_direct_real<float> {};
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///////////////////////////////////////////////////////////////////////////
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template <typename Modifiers>
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struct make_primitive<tag::double_, Modifiers>
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: make_real<double> {};
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template <typename Modifiers, typename A0>
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struct make_primitive<
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terminal_ex<tag::double_
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, fusion::vector1<A0> >, Modifiers>
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: make_direct_real<double> {};
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///////////////////////////////////////////////////////////////////////////
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template <typename Modifiers>
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struct make_primitive<tag::long_double, Modifiers>
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: make_real<long double> {};
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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
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, fusion::vector1<A0> >, Modifiers>
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: make_direct_real<long double> {};
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}}}
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#endif
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