ceph/src/boost/libs/locale/src/util/numeric.hpp

   1 //
   2 //  Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
   3 //
   4 //  Distributed under the Boost Software License, Version 1.0. (See
   5 //  accompanying file LICENSE_1_0.txt or copy at
   6 //  http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8 #ifndef BOOST_LOCALE_IMPL_UTIL_NUMERIC_HPP
   9 #define BOOST_LOCALE_IMPL_UTIL_NUMERIC_HPP
  10 #include <locale>
  11 #include <string>
  12 #include <ios>
  13 #include <boost/locale/formatting.hpp>
  14 #include <boost/locale/info.hpp>
  15 #include <sstream>
  16 #include <vector>
  17 #include <ctime>
  18 #include <stdlib.h>
  19
  20 #include "timezone.hpp"
  21
  22 // This is internal header so disable crappy "unsecure functions" for all
  23 #ifdef BOOST_MSVC
  24 #  pragma warning(disable : 4996)
  25 #endif
  26
  27
  28 namespace boost {
  29 namespace locale {
  30 namespace util {
  31
  32 template<typename CharType>
  33 struct formatting_size_traits {
  34     static size_t size(std::basic_string<CharType> const &s,std::locale const &/*l*/)
  35     {
  36         return s.size();
  37     }
  38 };
  39
  40 template<>
  41 struct formatting_size_traits<char> {
  42     static size_t size(std::string const &s,std::locale const &l)
  43     {
  44         if(!std::has_facet<info>(l))
  45             return s.size();
  46         if(!std::use_facet<info>(l).utf8())
  47             return s.size();
  48         // count code points, poor man's text size
  49         size_t res = 0;
  50         for(size_t i=0;i<s.size();i++) {
  51             unsigned char c = s[i];
  52             if(c <= 127)
  53                 res ++;
  54             else if ((c & 0xC0) == 0xC0) { // first UTF-8 byte
  55                 res ++;
  56             }
  57         }
  58         return res;
  59     }
  60 };
  61
  62
  63
  64 template<typename CharType>
  65 class base_num_format : public std::num_put<CharType>
  66 {
  67 public:
  68     typedef typename std::num_put<CharType>::iter_type iter_type;
  69     typedef std::basic_string<CharType> string_type;
  70     typedef CharType char_type;
  71
  72     base_num_format(size_t refs = 0) :
  73         std::num_put<CharType>(refs)
  74     {
  75     }
  76 protected:
  77
  78
  79     virtual iter_type do_put (iter_type out, std::ios_base &ios, char_type fill, long val) const
  80     {
  81         return do_real_put(out,ios,fill,val);
  82     }
  83     virtual iter_type do_put (iter_type out, std::ios_base &ios, char_type fill, unsigned long val) const
  84     {
  85         return do_real_put(out,ios,fill,val);
  86     }
  87     virtual iter_type do_put (iter_type out, std::ios_base &ios, char_type fill, double val) const
  88     {
  89         return do_real_put(out,ios,fill,val);
  90     }
  91     virtual iter_type do_put (iter_type out, std::ios_base &ios, char_type fill, long double val) const
  92     {
  93         return do_real_put(out,ios,fill,val);
  94     }
  95
  96     #ifndef BOOST_NO_LONG_LONG
  97     virtual iter_type do_put (iter_type out, std::ios_base &ios, char_type fill, long long val) const
  98     {
  99         return do_real_put(out,ios,fill,val);
 100     }
 101     virtual iter_type do_put (iter_type out, std::ios_base &ios, char_type fill, unsigned long long val) const
 102     {
 103         return do_real_put(out,ios,fill,val);
 104     }
 105     #endif
 106
 107
 108 private:
 109
 110
 111
 112     template<typename ValueType>
 113     iter_type do_real_put (iter_type out, std::ios_base &ios, char_type fill, ValueType val) const
 114     {
 115         typedef std::num_put<char_type> super;
 116
 117         ios_info &info=ios_info::get(ios);
 118
 119         switch(info.display_flags()) {
 120         case flags::posix:
 121             {
 122                 typedef std::basic_ostringstream<char_type> sstream_type;
 123                 sstream_type ss;
 124                 ss.imbue(std::locale::classic());
 125                 ss.flags(ios.flags());
 126                 ss.precision(ios.precision());
 127                 ss.width(ios.width());
 128                 iter_type ret_ptr = super::do_put(out,ss,fill,val);
 129                 ios.width(0);
 130                 return ret_ptr;
 131             }
 132         case flags::date:
 133             return format_time(out,ios,fill,static_cast<std::time_t>(val),'x');
 134         case flags::time:
 135             return format_time(out,ios,fill,static_cast<std::time_t>(val),'X');
 136         case flags::datetime:
 137             return format_time(out,ios,fill,static_cast<std::time_t>(val),'c');
 138         case flags::strftime:
 139             return format_time(out,ios,fill,static_cast<std::time_t>(val),info.date_time_pattern<char_type>());
 140         case flags::currency:
 141             {
 142                 bool nat =  info.currency_flags()==flags::currency_default
 143                             || info.currency_flags() == flags::currency_national;
 144                 bool intl = !nat;
 145                 return do_format_currency(intl,out,ios,fill,static_cast<long double>(val));
 146             }
 147
 148         case flags::number:
 149         case flags::percent:
 150         case flags::spellout:
 151         case flags::ordinal:
 152         default:
 153             return super::do_put(out,ios,fill,val);
 154         }
 155     }
 156
 157     virtual iter_type do_format_currency(bool intl,iter_type out,std::ios_base &ios,char_type fill,long double val) const
 158     {
 159         if(intl)
 160             return format_currency<true>(out,ios,fill,val);
 161         else
 162             return format_currency<false>(out,ios,fill,val);
 163     }
 164
 165     template<bool intl>
 166     iter_type format_currency(iter_type out,std::ios_base &ios,char_type fill,long double val) const
 167     {
 168         std::locale loc = ios.getloc();
 169         int digits = std::use_facet<std::moneypunct<char_type,intl> >(loc).frac_digits();
 170         while(digits > 0) {
 171             val*=10;
 172             digits --;
 173         }
 174         std::ios_base::fmtflags f=ios.flags();
 175         ios.flags(f | std::ios_base::showbase);
 176         out = std::use_facet<std::money_put<char_type> >(loc).put(out,intl,ios,fill,val);
 177         ios.flags(f);
 178         return out;
 179     }
 180
 181     iter_type format_time(iter_type out,std::ios_base &ios,char_type fill,std::time_t time,char c) const
 182     {
 183         string_type fmt;
 184         fmt+=char_type('%');
 185         fmt+=char_type(c);
 186         return format_time(out,ios,fill,time,fmt);
 187     }
 188
 189     iter_type format_time(iter_type out,std::ios_base &ios,char_type fill,std::time_t time,string_type const &format) const
 190     {
 191         std::string tz = ios_info::get(ios).time_zone();
 192         std::tm tm;
 193         #if defined(__linux) || defined(__FreeBSD__) || defined(__APPLE__)
 194         std::vector<char> tmp_buf(tz.c_str(),tz.c_str()+tz.size()+1);
 195         #endif
 196         if(tz.empty()) {
 197             #ifdef BOOST_WINDOWS
 198             /// Windows uses TLS
 199             tm = *localtime(&time);
 200             #else
 201             localtime_r(&time,&tm);
 202             #endif
 203         }
 204         else  {
 205             int gmtoff = parse_tz(tz);
 206             time+=gmtoff;
 207             #ifdef BOOST_WINDOWS
 208             /// Windows uses TLS
 209             tm = *gmtime(&time);
 210             #else
 211             gmtime_r(&time,&tm);
 212             #endif
 213
 214             #if defined(__linux) || defined(__FreeBSD__) || defined(__APPLE__)
 215             // These have extra fields to specify timezone
 216             if(gmtoff!=0) {
 217                 // bsd and apple want tm_zone be non-const
 218                 tm.tm_zone=&tmp_buf.front();
 219                 tm.tm_gmtoff = gmtoff;
 220             }
 221             #endif
 222         }
 223         std::basic_ostringstream<char_type> tmp_out;
 224         std::use_facet<std::time_put<char_type> >(ios.getloc()).put(tmp_out,tmp_out,fill,&tm,format.c_str(),format.c_str()+format.size());
 225         string_type str = tmp_out.str();
 226         std::streamsize on_left=0,on_right = 0;
 227         std::streamsize points =
 228             formatting_size_traits<char_type>::size(str,ios.getloc());
 229         if(points < ios.width()) {
 230             std::streamsize n = ios.width() - points;
 231
 232             std::ios_base::fmtflags flags = ios.flags() & std::ios_base::adjustfield;
 233
 234             //
 235             // we do not really know internal point, so we assume that it does not
 236             // exist. so according to the standard field should be right aligned
 237             //
 238             if(flags != std::ios_base::left)
 239                 on_left = n;
 240             on_right = n - on_left;
 241         }
 242         while(on_left > 0) {
 243             *out++ = fill;
 244             on_left--;
 245         }
 246         std::copy(str.begin(),str.end(),out);
 247         while(on_right > 0) {
 248             *out++ = fill;
 249             on_right--;
 250         }
 251         ios.width(0);
 252         return out;
 253     }
 254
 255 };  /// num_format
 256
 257
 258 template<typename CharType>
 259 class base_num_parse : public std::num_get<CharType>
 260 {
 261 public:
 262     base_num_parse(size_t refs = 0) :
 263         std::num_get<CharType>(refs)
 264     {
 265     }
 266 protected:
 267     typedef typename std::num_get<CharType>::iter_type iter_type;
 268     typedef std::basic_string<CharType> string_type;
 269     typedef CharType char_type;
 270
 271     virtual iter_type do_get(iter_type in, iter_type end, std::ios_base &ios,std::ios_base::iostate &err,long &val) const
 272     {
 273         return do_real_get(in,end,ios,err,val);
 274     }
 275
 276     virtual iter_type do_get(iter_type in, iter_type end, std::ios_base &ios,std::ios_base::iostate &err,unsigned short &val) const
 277     {
 278         return do_real_get(in,end,ios,err,val);
 279     }
 280
 281     virtual iter_type do_get(iter_type in, iter_type end, std::ios_base &ios,std::ios_base::iostate &err,unsigned int &val) const
 282     {
 283         return do_real_get(in,end,ios,err,val);
 284     }
 285
 286     virtual iter_type do_get(iter_type in, iter_type end, std::ios_base &ios,std::ios_base::iostate &err,unsigned long &val) const
 287     {
 288         return do_real_get(in,end,ios,err,val);
 289     }
 290
 291     virtual iter_type do_get(iter_type in, iter_type end, std::ios_base &ios,std::ios_base::iostate &err,float &val) const
 292     {
 293         return do_real_get(in,end,ios,err,val);
 294     }
 295
 296     virtual iter_type do_get(iter_type in, iter_type end, std::ios_base &ios,std::ios_base::iostate &err,double &val) const
 297     {
 298         return do_real_get(in,end,ios,err,val);
 299     }
 300
 301     virtual iter_type do_get (iter_type in, iter_type end, std::ios_base &ios,std::ios_base::iostate &err,long double &val) const
 302     {
 303         return do_real_get(in,end,ios,err,val);
 304     }
 305
 306     #ifndef BOOST_NO_LONG_LONG
 307     virtual iter_type do_get (iter_type in, iter_type end, std::ios_base &ios,std::ios_base::iostate &err,long long &val) const
 308     {
 309         return do_real_get(in,end,ios,err,val);
 310     }
 311
 312     virtual iter_type do_get (iter_type in, iter_type end, std::ios_base &ios,std::ios_base::iostate &err,unsigned long long &val) const
 313     {
 314         return do_real_get(in,end,ios,err,val);
 315     }
 316
 317     #endif
 318
 319 private:
 320
 321     template<typename ValueType>
 322     iter_type do_real_get(iter_type in,iter_type end,std::ios_base &ios,std::ios_base::iostate &err,ValueType &val) const
 323     {
 324         typedef std::num_get<char_type> super;
 325
 326         ios_info &info=ios_info::get(ios);
 327
 328         switch(info.display_flags()) {
 329         case flags::posix:
 330             {
 331                 std::stringstream ss;
 332                 ss.imbue(std::locale::classic());
 333                 ss.flags(ios.flags());
 334                 ss.precision(ios.precision());
 335                 return super::do_get(in,end,ss,err,val);
 336             }
 337         case flags::currency:
 338             {
 339                 long double ret_val = 0;
 340                 if(info.currency_flags()==flags::currency_default || info.currency_flags() == flags::currency_national)
 341                     in = parse_currency<false>(in,end,ios,err,ret_val);
 342                 else
 343                     in = parse_currency<true>(in,end,ios,err,ret_val);
 344                 if(!(err & std::ios_base::failbit))
 345                     val = static_cast<ValueType>(ret_val);
 346                 return in;
 347             }
 348
 349         // date-time parsing is not supported
 350         // due to buggy standard
 351         case flags::date:
 352         case flags::time:
 353         case flags::datetime:
 354         case flags::strftime:
 355
 356         case flags::number:
 357         case flags::percent:
 358         case flags::spellout:
 359         case flags::ordinal:
 360         default:
 361             return super::do_get(in,end,ios,err,val);
 362         }
 363     }
 364
 365     template<bool intl>
 366     iter_type parse_currency(iter_type in,iter_type end,std::ios_base &ios,std::ios_base::iostate &err,long double &val) const
 367     {
 368         std::locale loc = ios.getloc();
 369         int digits = std::use_facet<std::moneypunct<char_type,intl> >(loc).frac_digits();
 370         long double rval;
 371         in = std::use_facet<std::money_get<char_type> >(loc).get(in,end,intl,ios,err,rval);
 372         if(!(err & std::ios::failbit)) {
 373             while(digits > 0) {
 374                 rval/=10;
 375                 digits --;
 376             }
 377             val = rval;
 378         }
 379         return in;
 380     }
 381
 382
 383 };
 384
 385 } // util
 386 } // locale
 387 } //boost
 388
 389
 390
 391
 392 #endif
 393 // vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4