| /*============================================================================= | |
| Copyright (c) 1998-2003 Joel de Guzman | |
| Copyright (c) 2001-2003 Hartmut Kaiser | |
| http://spirit.sourceforge.net/ | |
| 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) | |
| =============================================================================*/ | |
| #ifndef BOOST_SPIRIT_NUMERICS_HPP | |
| #define BOOST_SPIRIT_NUMERICS_HPP | |
| #include <boost/config.hpp> | |
| #include <boost/spirit/home/classic/namespace.hpp> | |
| #include <boost/spirit/home/classic/core/parser.hpp> | |
| #include <boost/spirit/home/classic/core/composite/directives.hpp> | |
| #include <boost/spirit/home/classic/core/primitives/numerics_fwd.hpp> | |
| #include <boost/spirit/home/classic/core/primitives/impl/numerics.ipp> | |
| namespace boost { namespace spirit { | |
| BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN | |
| /////////////////////////////////////////////////////////////////////////// | |
| // | |
| // uint_parser class | |
| // | |
| /////////////////////////////////////////////////////////////////////////// | |
| template < | |
| typename T, | |
| int Radix, | |
| unsigned MinDigits, | |
| int MaxDigits | |
| > | |
| struct uint_parser : parser<uint_parser<T, Radix, MinDigits, MaxDigits> > | |
| { | |
| typedef uint_parser<T, Radix, MinDigits, MaxDigits> self_t; | |
| template <typename ScannerT> | |
| struct result | |
| { | |
| typedef typename match_result<ScannerT, T>::type type; | |
| }; | |
| template <typename ScannerT> | |
| typename parser_result<self_t, ScannerT>::type | |
| parse(ScannerT const& scan) const | |
| { | |
| typedef impl::uint_parser_impl<T, Radix, MinDigits, MaxDigits> impl_t; | |
| typedef typename parser_result<impl_t, ScannerT>::type result_t; | |
| return impl::contiguous_parser_parse<result_t>(impl_t(), scan, scan); | |
| } | |
| }; | |
| /////////////////////////////////////////////////////////////////////////// | |
| // | |
| // int_parser class | |
| // | |
| /////////////////////////////////////////////////////////////////////////// | |
| template < | |
| typename T, | |
| int Radix, | |
| unsigned MinDigits, | |
| int MaxDigits | |
| > | |
| struct int_parser : parser<int_parser<T, Radix, MinDigits, MaxDigits> > | |
| { | |
| typedef int_parser<T, Radix, MinDigits, MaxDigits> self_t; | |
| template <typename ScannerT> | |
| struct result | |
| { | |
| typedef typename match_result<ScannerT, T>::type type; | |
| }; | |
| template <typename ScannerT> | |
| typename parser_result<self_t, ScannerT>::type | |
| parse(ScannerT const& scan) const | |
| { | |
| typedef impl::int_parser_impl<T, Radix, MinDigits, MaxDigits> impl_t; | |
| typedef typename parser_result<impl_t, ScannerT>::type result_t; | |
| return impl::contiguous_parser_parse<result_t>(impl_t(), scan, scan); | |
| } | |
| }; | |
| /////////////////////////////////////////////////////////////////////////// | |
| // | |
| // uint_parser/int_parser instantiations | |
| // | |
| /////////////////////////////////////////////////////////////////////////// | |
| int_parser<int> const | |
| int_p = int_parser<int>(); | |
| uint_parser<unsigned> const | |
| uint_p = uint_parser<unsigned>(); | |
| uint_parser<unsigned, 2> const | |
| bin_p = uint_parser<unsigned, 2>(); | |
| uint_parser<unsigned, 8> const | |
| oct_p = uint_parser<unsigned, 8>(); | |
| uint_parser<unsigned, 16> const | |
| hex_p = uint_parser<unsigned, 16>(); | |
| /////////////////////////////////////////////////////////////////////////// | |
| // | |
| // sign_parser class | |
| // | |
| /////////////////////////////////////////////////////////////////////////// | |
| namespace impl | |
| { | |
| // Utility to extract the prefix sign ('-' | '+') | |
| template <typename ScannerT> | |
| bool extract_sign(ScannerT const& scan, std::size_t& count); | |
| } | |
| struct sign_parser : public parser<sign_parser> | |
| { | |
| typedef sign_parser self_t; | |
| template <typename ScannerT> | |
| struct result | |
| { | |
| typedef typename match_result<ScannerT, bool>::type type; | |
| }; | |
| sign_parser() {} | |
| template <typename ScannerT> | |
| typename parser_result<self_t, ScannerT>::type | |
| parse(ScannerT const& scan) const | |
| { | |
| if (!scan.at_end()) | |
| { | |
| std::size_t length; | |
| typename ScannerT::iterator_t save(scan.first); | |
| bool neg = impl::extract_sign(scan, length); | |
| if (length) | |
| return scan.create_match(1, neg, save, scan.first); | |
| } | |
| return scan.no_match(); | |
| } | |
| }; | |
| sign_parser const sign_p = sign_parser(); | |
| /////////////////////////////////////////////////////////////////////////// | |
| // | |
| // default real number policies | |
| // | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename T> | |
| struct ureal_parser_policies | |
| { | |
| // trailing dot policy suggested suggested by Gustavo Guerra | |
| BOOST_STATIC_CONSTANT(bool, allow_leading_dot = true); | |
| BOOST_STATIC_CONSTANT(bool, allow_trailing_dot = true); | |
| BOOST_STATIC_CONSTANT(bool, expect_dot = false); | |
| typedef uint_parser<T, 10, 1, -1> uint_parser_t; | |
| typedef int_parser<T, 10, 1, -1> int_parser_t; | |
| template <typename ScannerT> | |
| static typename match_result<ScannerT, nil_t>::type | |
| parse_sign(ScannerT& scan) | |
| { | |
| return scan.no_match(); | |
| } | |
| template <typename ScannerT> | |
| static typename parser_result<uint_parser_t, ScannerT>::type | |
| parse_n(ScannerT& scan) | |
| { | |
| return uint_parser_t().parse(scan); | |
| } | |
| template <typename ScannerT> | |
| static typename parser_result<chlit<>, ScannerT>::type | |
| parse_dot(ScannerT& scan) | |
| { | |
| return ch_p('.').parse(scan); | |
| } | |
| template <typename ScannerT> | |
| static typename parser_result<uint_parser_t, ScannerT>::type | |
| parse_frac_n(ScannerT& scan) | |
| { | |
| return uint_parser_t().parse(scan); | |
| } | |
| template <typename ScannerT> | |
| static typename parser_result<chlit<>, ScannerT>::type | |
| parse_exp(ScannerT& scan) | |
| { | |
| return as_lower_d['e'].parse(scan); | |
| } | |
| template <typename ScannerT> | |
| static typename parser_result<int_parser_t, ScannerT>::type | |
| parse_exp_n(ScannerT& scan) | |
| { | |
| return int_parser_t().parse(scan); | |
| } | |
| }; | |
| template <typename T> | |
| struct real_parser_policies : public ureal_parser_policies<T> | |
| { | |
| template <typename ScannerT> | |
| static typename parser_result<sign_parser, ScannerT>::type | |
| parse_sign(ScannerT& scan) | |
| { | |
| return sign_p.parse(scan); | |
| } | |
| }; | |
| /////////////////////////////////////////////////////////////////////////// | |
| // | |
| // real_parser class | |
| // | |
| /////////////////////////////////////////////////////////////////////////// | |
| template < | |
| typename T, | |
| typename RealPoliciesT | |
| > | |
| struct real_parser | |
| : public parser<real_parser<T, RealPoliciesT> > | |
| { | |
| typedef real_parser<T, RealPoliciesT> self_t; | |
| template <typename ScannerT> | |
| struct result | |
| { | |
| typedef typename match_result<ScannerT, T>::type type; | |
| }; | |
| real_parser() {} | |
| template <typename ScannerT> | |
| typename parser_result<self_t, ScannerT>::type | |
| parse(ScannerT const& scan) const | |
| { | |
| typedef typename parser_result<self_t, ScannerT>::type result_t; | |
| return impl::real_parser_impl<result_t, T, RealPoliciesT>::parse(scan); | |
| } | |
| }; | |
| /////////////////////////////////////////////////////////////////////////// | |
| // | |
| // real_parser instantiations | |
| // | |
| /////////////////////////////////////////////////////////////////////////// | |
| real_parser<double, ureal_parser_policies<double> > const | |
| ureal_p = real_parser<double, ureal_parser_policies<double> >(); | |
| real_parser<double, real_parser_policies<double> > const | |
| real_p = real_parser<double, real_parser_policies<double> >(); | |
| /////////////////////////////////////////////////////////////////////////// | |
| // | |
| // strict reals (do not allow plain integers (no decimal point)) | |
| // | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename T> | |
| struct strict_ureal_parser_policies : public ureal_parser_policies<T> | |
| { | |
| BOOST_STATIC_CONSTANT(bool, expect_dot = true); | |
| }; | |
| template <typename T> | |
| struct strict_real_parser_policies : public real_parser_policies<T> | |
| { | |
| BOOST_STATIC_CONSTANT(bool, expect_dot = true); | |
| }; | |
| real_parser<double, strict_ureal_parser_policies<double> > const | |
| strict_ureal_p | |
| = real_parser<double, strict_ureal_parser_policies<double> >(); | |
| real_parser<double, strict_real_parser_policies<double> > const | |
| strict_real_p | |
| = real_parser<double, strict_real_parser_policies<double> >(); | |
| BOOST_SPIRIT_CLASSIC_NAMESPACE_END | |
| }} // namespace BOOST_SPIRIT_CLASSIC_NS | |
| #endif |