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  1. // Copyright Kevlin Henney, 2000-2005.
  2. // Copyright Alexander Nasonov, 2006-2010.
  3. // Copyright Antony Polukhin, 2011-2014.
  4. //
  5. // Distributed under the Boost Software License, Version 1.0. (See
  6. // accompanying file LICENSE_1_0.txt or copy at
  7. // http://www.boost.org/LICENSE_1_0.txt)
  8. //
  9. // what:  lexical_cast custom keyword cast
  10. // who:   contributed by Kevlin Henney,
  11. //        enhanced with contributions from Terje Slettebo,
  12. //        with additional fixes and suggestions from Gennaro Prota,
  13. //        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
  14. //        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
  15. //        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
  16. // when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
  17.  
  18. #ifndef BOOST_LEXICAL_CAST_DETAIL_INF_NAN_HPP
  19. #define BOOST_LEXICAL_CAST_DETAIL_INF_NAN_HPP
  20.  
  21. #include <boost/config.hpp>
  22. #ifdef BOOST_HAS_PRAGMA_ONCE
  23. #   pragma once
  24. #endif
  25.  
  26. #if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
  27. #define BOOST_LCAST_NO_WCHAR_T
  28. #endif
  29.  
  30. #include <cstddef>
  31. #include <cstring>
  32. #include <boost/limits.hpp>
  33. #include <boost/detail/workaround.hpp>
  34. #include <boost/math/special_functions/sign.hpp>
  35. #include <boost/math/special_functions/fpclassify.hpp>
  36.  
  37. #include <boost/lexical_cast/detail/lcast_char_constants.hpp>
  38.  
  39. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost {
  40.     namespace detail
  41.     {
  42.         template <class CharT>
  43.         bool lc_iequal(const CharT* val, const CharT* lcase, const CharT* ucase, unsigned int len) BOOST_NOEXCEPT {
  44.             for( unsigned int i=0; i < len; ++i ) {
  45.                 if ( val[i] != lcase[i] && val[i] != ucase[i] ) return false;
  46.             }
  47.  
  48.             return true;
  49.         }
  50.  
  51.         /* Returns true and sets the correct value if found NaN or Inf. */
  52.         template <class CharT, class T>
  53.         inline bool parse_inf_nan_impl(const CharT* begin, const CharT* end, T& value
  54.             , const CharT* lc_NAN, const CharT* lc_nan
  55.             , const CharT* lc_INFINITY, const CharT* lc_infinity
  56.             , const CharT opening_brace, const CharT closing_brace) BOOST_NOEXCEPT
  57.         {
  58.             using namespace std;
  59.             if (begin == end) return false;
  60.             const CharT minus = lcast_char_constants<CharT>::minus;
  61.             const CharT plus = lcast_char_constants<CharT>::plus;
  62.             const int inifinity_size = 8; // == sizeof("infinity") - 1
  63.  
  64.             /* Parsing +/- */
  65.             bool const has_minus = (*begin == minus);
  66.             if (has_minus || *begin == plus) {
  67.                 ++ begin;
  68.             }
  69.  
  70.             if (end - begin < 3) return false;
  71.             if (lc_iequal(begin, lc_nan, lc_NAN, 3)) {
  72.                 begin += 3;
  73.                 if (end != begin) {
  74.                     /* It is 'nan(...)' or some bad input*/
  75.                    
  76.                     if (end - begin < 2) return false; // bad input
  77.                     -- end;
  78.                     if (*begin != opening_brace || *end != closing_brace) return false; // bad input
  79.                 }
  80.  
  81.                 if( !has_minus ) value = std::numeric_limits<T>::quiet_NaN();
  82.                 else value = (mars_boost::math::changesign) (std::numeric_limits<T>::quiet_NaN());
  83.                 return true;
  84.             } else if (
  85.                 ( /* 'INF' or 'inf' */
  86.                   end - begin == 3      // 3 == sizeof('inf') - 1
  87.                   && lc_iequal(begin, lc_infinity, lc_INFINITY, 3)
  88.                 )
  89.                 ||
  90.                 ( /* 'INFINITY' or 'infinity' */
  91.                   end - begin == inifinity_size
  92.                   && lc_iequal(begin, lc_infinity, lc_INFINITY, inifinity_size)
  93.                 )
  94.              )
  95.             {
  96.                 if( !has_minus ) value = std::numeric_limits<T>::infinity();
  97.                 else value = (mars_boost::math::changesign) (std::numeric_limits<T>::infinity());
  98.                 return true;
  99.             }
  100.  
  101.             return false;
  102.         }
  103.  
  104.         template <class CharT, class T>
  105.         bool put_inf_nan_impl(CharT* begin, CharT*& end, const T& value
  106.                          , const CharT* lc_nan
  107.                          , const CharT* lc_infinity) BOOST_NOEXCEPT
  108.         {
  109.             using namespace std;
  110.             const CharT minus = lcast_char_constants<CharT>::minus;
  111.             if ((mars_boost::math::isnan)(value)) {
  112.                 if ((mars_boost::math::signbit)(value)) {
  113.                     *begin = minus;
  114.                     ++ begin;
  115.                 }
  116.  
  117.                 memcpy(begin, lc_nan, 3 * sizeof(CharT));
  118.                 end = begin + 3;
  119.                 return true;
  120.             } else if ((mars_boost::math::isinf)(value)) {
  121.                 if ((mars_boost::math::signbit)(value)) {
  122.                     *begin = minus;
  123.                     ++ begin;
  124.                 }
  125.  
  126.                 memcpy(begin, lc_infinity, 3 * sizeof(CharT));
  127.                 end = begin + 3;
  128.                 return true;
  129.             }
  130.  
  131.             return false;
  132.         }
  133.  
  134.  
  135. #ifndef BOOST_LCAST_NO_WCHAR_T
  136.         template <class T>
  137.         bool parse_inf_nan(const wchar_t* begin, const wchar_t* end, T& value) BOOST_NOEXCEPT {
  138.             return parse_inf_nan_impl(begin, end, value
  139.                                , L"NAN", L"nan"
  140.                                , L"INFINITY", L"infinity"
  141.                                , L'(', L')');
  142.         }
  143.  
  144.         template <class T>
  145.         bool put_inf_nan(wchar_t* begin, wchar_t*& end, const T& value) BOOST_NOEXCEPT {
  146.             return put_inf_nan_impl(begin, end, value, L"nan", L"infinity");
  147.         }
  148.  
  149. #endif
  150. #if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
  151.         template <class T>
  152.         bool parse_inf_nan(const char16_t* begin, const char16_t* end, T& value) BOOST_NOEXCEPT {
  153.             return parse_inf_nan_impl(begin, end, value
  154.                                , u"NAN", u"nan"
  155.                                , u"INFINITY", u"infinity"
  156.                                , u'(', u')');
  157.         }
  158.  
  159.         template <class T>
  160.         bool put_inf_nan(char16_t* begin, char16_t*& end, const T& value) BOOST_NOEXCEPT {
  161.             return put_inf_nan_impl(begin, end, value, u"nan", u"infinity");
  162.         }
  163. #endif
  164. #if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
  165.         template <class T>
  166.         bool parse_inf_nan(const char32_t* begin, const char32_t* end, T& value) BOOST_NOEXCEPT {
  167.             return parse_inf_nan_impl(begin, end, value
  168.                                , U"NAN", U"nan"
  169.                                , U"INFINITY", U"infinity"
  170.                                , U'(', U')');
  171.         }
  172.  
  173.         template <class T>
  174.         bool put_inf_nan(char32_t* begin, char32_t*& end, const T& value) BOOST_NOEXCEPT {
  175.             return put_inf_nan_impl(begin, end, value, U"nan", U"infinity");
  176.         }
  177. #endif
  178.  
  179.         template <class CharT, class T>
  180.         bool parse_inf_nan(const CharT* begin, const CharT* end, T& value) BOOST_NOEXCEPT {
  181.             return parse_inf_nan_impl(begin, end, value
  182.                                , "NAN", "nan"
  183.                                , "INFINITY", "infinity"
  184.                                , '(', ')');
  185.         }
  186.  
  187.         template <class CharT, class T>
  188.         bool put_inf_nan(CharT* begin, CharT*& end, const T& value) BOOST_NOEXCEPT {
  189.             return put_inf_nan_impl(begin, end, value, "nan", "infinity");
  190.         }
  191.     }
  192. } // namespace mars_boost
  193.  
  194. #undef BOOST_LCAST_NO_WCHAR_T
  195.  
  196. #endif // BOOST_LEXICAL_CAST_DETAIL_INF_NAN_HPP
  197.  
  198.  
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