1 #ifndef _DATE_TIME_TIME_PARSING_HPP___ 2 #define _DATE_TIME_TIME_PARSING_HPP___ 3 4 /* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc. 5 * Use, modification and distribution is subject to the 6 * Boost Software License, Version 1.0. (See accompanying 7 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) 8 * Author: Jeff Garland, Bart Garst 9 * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $ 10 */ 11 12 #include "boost/tokenizer.hpp" 13 #include "boost/lexical_cast.hpp" 14 #include "boost/date_time/date_parsing.hpp" 15 #include "boost/cstdint.hpp" 16 #include <iostream> 17 18 namespace boost { 19 namespace date_time { 20 21 //! computes exponential math like 2^8 => 256, only works with positive integers 22 //Not general purpose, but needed b/c std::pow is not available 23 //everywehere. Hasn't been tested with negatives and zeros 24 template<class int_type> 25 inline power(int_type base,int_type exponent)26 int_type power(int_type base, int_type exponent) 27 { 28 int_type result = 1; 29 for(int i = 0; i < exponent; ++i){ 30 result *= base; 31 } 32 return result; 33 } 34 35 //! Creates a time_duration object from a delimited string 36 /*! Expected format for string is "[-]h[h][:mm][:ss][.fff]". 37 * If the number of fractional digits provided is greater than the 38 * precision of the time duration type then the extra digits are 39 * truncated. 40 * 41 * A negative duration will be created if the first character in 42 * string is a '-', all other '-' will be treated as delimiters. 43 * Accepted delimiters are "-:,.". 44 */ 45 template<class time_duration, class char_type> 46 inline 47 time_duration str_from_delimited_time_duration(const std::basic_string<char_type> & s)48 str_from_delimited_time_duration(const std::basic_string<char_type>& s) 49 { 50 unsigned short min=0, sec =0; 51 int hour =0; 52 bool is_neg = (s.at(0) == '-'); 53 boost::int64_t fs=0; 54 int pos = 0; 55 56 typedef typename std::basic_string<char_type>::traits_type traits_type; 57 typedef boost::char_separator<char_type, traits_type> char_separator_type; 58 typedef boost::tokenizer<char_separator_type, 59 typename std::basic_string<char_type>::const_iterator, 60 std::basic_string<char_type> > tokenizer; 61 typedef typename boost::tokenizer<char_separator_type, 62 typename std::basic_string<char_type>::const_iterator, 63 typename std::basic_string<char_type> >::iterator tokenizer_iterator; 64 65 char_type sep_chars[5] = {'-',':',',','.'}; 66 char_separator_type sep(sep_chars); 67 tokenizer tok(s,sep); 68 for(tokenizer_iterator beg=tok.begin(); beg!=tok.end();++beg){ 69 switch(pos) { 70 case 0: { 71 hour = boost::lexical_cast<int>(*beg); 72 break; 73 } 74 case 1: { 75 min = boost::lexical_cast<unsigned short>(*beg); 76 break; 77 } 78 case 2: { 79 sec = boost::lexical_cast<unsigned short>(*beg); 80 break; 81 }; 82 case 3: { 83 int digits = static_cast<int>(beg->length()); 84 //Works around a bug in MSVC 6 library that does not support 85 //operator>> thus meaning lexical_cast will fail to compile. 86 #if (defined(BOOST_MSVC) && (_MSC_VER < 1300)) 87 // msvc wouldn't compile 'time_duration::num_fractional_digits()' 88 // (required template argument list) as a workaround a temp 89 // time_duration object was used 90 time_duration td(hour,min,sec,fs); 91 int precision = td.num_fractional_digits(); 92 // _atoi64 is an MS specific function 93 if(digits >= precision) { 94 // drop excess digits 95 fs = _atoi64(beg->substr(0, precision).c_str()); 96 } 97 else { 98 fs = _atoi64(beg->c_str()); 99 } 100 #else 101 int precision = time_duration::num_fractional_digits(); 102 if(digits >= precision) { 103 // drop excess digits 104 fs = boost::lexical_cast<boost::int64_t>(beg->substr(0, precision)); 105 } 106 else { 107 fs = boost::lexical_cast<boost::int64_t>(*beg); 108 } 109 #endif 110 if(digits < precision){ 111 // trailing zeros get dropped from the string, 112 // "1:01:01.1" would yield .000001 instead of .100000 113 // the power() compensates for the missing decimal places 114 fs *= power(10, precision - digits); 115 } 116 117 break; 118 } 119 }//switch 120 pos++; 121 } 122 if(is_neg) { 123 return -time_duration(hour, min, sec, fs); 124 } 125 else { 126 return time_duration(hour, min, sec, fs); 127 } 128 } 129 130 //! Creates a time_duration object from a delimited string 131 /*! Expected format for string is "[-]h[h][:mm][:ss][.fff]". 132 * If the number of fractional digits provided is greater than the 133 * precision of the time duration type then the extra digits are 134 * truncated. 135 * 136 * A negative duration will be created if the first character in 137 * string is a '-', all other '-' will be treated as delimiters. 138 * Accepted delimiters are "-:,.". 139 */ 140 template<class time_duration> 141 inline 142 time_duration parse_delimited_time_duration(const std::string & s)143 parse_delimited_time_duration(const std::string& s) 144 { 145 return str_from_delimited_time_duration<time_duration,char>(s); 146 } 147 148 //! Utility function to split appart string 149 inline 150 bool split(const std::string & s,char sep,std::string & first,std::string & second)151 split(const std::string& s, 152 char sep, 153 std::string& first, 154 std::string& second) 155 { 156 int sep_pos = static_cast<int>(s.find(sep)); 157 first = s.substr(0,sep_pos); 158 second = s.substr(sep_pos+1); 159 return true; 160 } 161 162 163 template<class time_type> 164 inline 165 time_type parse_delimited_time(const std::string & s,char sep)166 parse_delimited_time(const std::string& s, char sep) 167 { 168 typedef typename time_type::time_duration_type time_duration; 169 typedef typename time_type::date_type date_type; 170 171 //split date/time on a unique delimiter char such as ' ' or 'T' 172 std::string date_string, tod_string; 173 split(s, sep, date_string, tod_string); 174 //call parse_date with first string 175 date_type d = parse_date<date_type>(date_string); 176 //call parse_time_duration with remaining string 177 time_duration td = parse_delimited_time_duration<time_duration>(tod_string); 178 //construct a time 179 return time_type(d, td); 180 181 } 182 183 //! Parse time duration part of an iso time of form: [-]hhmmss[.fff...] (eg: 120259.123 is 12 hours, 2 min, 59 seconds, 123000 microseconds) 184 template<class time_duration> 185 inline 186 time_duration parse_undelimited_time_duration(const std::string & s)187 parse_undelimited_time_duration(const std::string& s) 188 { 189 int precision = 0; 190 { 191 // msvc wouldn't compile 'time_duration::num_fractional_digits()' 192 // (required template argument list) as a workaround, a temp 193 // time_duration object was used 194 time_duration tmp(0,0,0,1); 195 precision = tmp.num_fractional_digits(); 196 } 197 // 'precision+1' is so we grab all digits, plus the decimal 198 int offsets[] = {2,2,2, precision+1}; 199 int pos = 0, sign = 0; 200 int hours = 0; 201 short min=0, sec=0; 202 boost::int64_t fs=0; 203 // increment one position if the string was "signed" 204 if(s.at(sign) == '-') 205 { 206 ++sign; 207 } 208 // stlport choked when passing s.substr() to tokenizer 209 // using a new string fixed the error 210 std::string remain = s.substr(sign); 211 /* We do not want the offset_separator to wrap the offsets, we 212 * will never want to process more than: 213 * 2 char, 2 char, 2 char, frac_sec length. 214 * We *do* want the offset_separator to give us a partial for the 215 * last characters if there were not enough provided in the input string. */ 216 bool wrap_off = false; 217 bool ret_part = true; 218 boost::offset_separator osf(offsets, offsets+4, wrap_off, ret_part); 219 typedef boost::tokenizer<boost::offset_separator, 220 std::basic_string<char>::const_iterator, 221 std::basic_string<char> > tokenizer; 222 typedef boost::tokenizer<boost::offset_separator, 223 std::basic_string<char>::const_iterator, 224 std::basic_string<char> >::iterator tokenizer_iterator; 225 tokenizer tok(remain, osf); 226 for(tokenizer_iterator ti=tok.begin(); ti!=tok.end();++ti){ 227 switch(pos) { 228 case 0: 229 { 230 hours = boost::lexical_cast<int>(*ti); 231 break; 232 } 233 case 1: 234 { 235 min = boost::lexical_cast<short>(*ti); 236 break; 237 } 238 case 2: 239 { 240 sec = boost::lexical_cast<short>(*ti); 241 break; 242 } 243 case 3: 244 { 245 std::string char_digits(ti->substr(1)); // digits w/no decimal 246 int digits = static_cast<int>(char_digits.length()); 247 248 //Works around a bug in MSVC 6 library that does not support 249 //operator>> thus meaning lexical_cast will fail to compile. 250 #if (defined(BOOST_MSVC) && (_MSC_VER <= 1200)) // 1200 == VC++ 6.0 251 // _atoi64 is an MS specific function 252 if(digits >= precision) { 253 // drop excess digits 254 fs = _atoi64(char_digits.substr(0, precision).c_str()); 255 } 256 else if(digits == 0) { 257 fs = 0; // just in case _atoi64 doesn't like an empty string 258 } 259 else { 260 fs = _atoi64(char_digits.c_str()); 261 } 262 #else 263 if(digits >= precision) { 264 // drop excess digits 265 fs = boost::lexical_cast<boost::int64_t>(char_digits.substr(0, precision)); 266 } 267 else if(digits == 0) { 268 fs = 0; // lexical_cast doesn't like empty strings 269 } 270 else { 271 fs = boost::lexical_cast<boost::int64_t>(char_digits); 272 } 273 #endif 274 if(digits < precision){ 275 // trailing zeros get dropped from the string, 276 // "1:01:01.1" would yield .000001 instead of .100000 277 // the power() compensates for the missing decimal places 278 fs *= power(10, precision - digits); 279 } 280 281 break; 282 } 283 }; 284 pos++; 285 } 286 if(sign) { 287 return -time_duration(hours, min, sec, fs); 288 } 289 else { 290 return time_duration(hours, min, sec, fs); 291 } 292 } 293 294 //! Parse time string of form YYYYMMDDThhmmss where T is delimeter between date and time 295 template<class time_type> 296 inline 297 time_type parse_iso_time(const std::string & s,char sep)298 parse_iso_time(const std::string& s, char sep) 299 { 300 typedef typename time_type::time_duration_type time_duration; 301 typedef typename time_type::date_type date_type; 302 303 //split date/time on a unique delimiter char such as ' ' or 'T' 304 std::string date_string, tod_string; 305 split(s, sep, date_string, tod_string); 306 //call parse_date with first string 307 date_type d = parse_undelimited_date<date_type>(date_string); 308 //call parse_time_duration with remaining string 309 time_duration td = parse_undelimited_time_duration<time_duration>(tod_string); 310 //construct a time 311 return time_type(d, td); 312 } 313 314 315 316 } }//namespace date_time 317 318 319 320 321 #endif 322