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342 lines
12 KiB
342 lines
12 KiB
/*============================================================================= |
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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) 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); |
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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& context, Skipper const& skipper |
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, Attribute& 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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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); |
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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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