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