diplodocus.org Git - nmh/blob - sbr/dtimep.lex

   1 %{
   2 #include <h/nmh.h>
   3 #include <h/tws.h>
   4
   5   /* Since we're looking at a string at a time, don't worry about
   6    *  wrapping to the next buffer.
   7    */
   8 #define yywrap() 1
   9 #define YY_SKIP_YYWRAP
  10
  11 #define YY_NO_UNPUT
  12
  13   /* This is the tricky thing that makes this function cool.  We
  14    *  replace the traditional int yylex(void) declaration with our
  15    *  dparsetime() declaration, essentially piggy-backing off the
  16    *  utility of the yylex() function and adding what we need to make
  17    *  the parsing function useful to us.
  18    */
  19 #define YY_DECL struct tws *dparsetime(char *lexstr)
  20
  21   /* yyerminate() is called after the input string is matched to
  22    * completion (actually, when the lexer reaches an EOF).  The only
  23    * thing that really needs to be in this macro function is the
  24    * return call, which must be substituted inline into dparsetime.
  25    */
  26
  27 #define yyterminate() (void)yy_delete_buffer(lexhandle); \
  28   if(!(tw.tw_flags & TW_SUCC)) { \
  29     return (struct tws *)NULL; \
  30   } \
  31   if(tw.tw_year < 1970) \
  32     tw.tw_year += 1900; \
  33   if(tw.tw_year < 1970) \
  34     tw.tw_year += 100; \
  35   return(&tw)
  36
  37 /*
  38  * Patchable flag that says how to interpret NN/NN/NN dates. When
  39  * true, we do it European style: DD/MM/YY. When false, we do it
  40  * American style: MM/DD/YY.  Of course, these are all non-RFC822
  41  * compliant.
  42  */
  43 int europeandate = 0;
  44
  45 /*
  46  * Table to convert month names to numeric month.  We use the
  47  * fact that the low order 5 bits of the sum of the 2nd & 3rd
  48  * characters of the name is a hash with no collisions for the 12
  49  * valid month names.  (The mask to 5 bits maps any combination of
  50  * upper and lower case into the same hash value).
  51  */
  52 static int month_map[] = {
  53         0,
  54         6,      /* 1 - Jul */
  55         3,      /* 2 - Apr */
  56         5,      /* 3 - Jun */
  57         0,
  58         10,     /* 5 - Nov */
  59         0,
  60         1,      /* 7 - Feb */
  61         11,     /* 8 - Dec */
  62         0,
  63         0,
  64         0,
  65         0,
  66         0,
  67         0,
  68         0,      /*15 - Jan */
  69         0,
  70         0,
  71         0,
  72         2,      /*19 - Mar */
  73         0,
  74         8,      /*21 - Sep */
  75         0,
  76         9,      /*23 - Oct */
  77         0,
  78         0,
  79         4,      /*26 - May */
  80         0,
  81         7       /*28 - Aug */
  82 };
  83
  84 /*
  85  * Lookup table for day-of-week using the same hash trick as for above name-of-
  86  * month table, but using the first and second character, not second and third.
  87  *
  88  * Compute index into table using: (day_name[0] & 7) + (day_name[1] & 4)
  89  */
  90 static int day_map[] = {
  91         0,
  92         0,
  93         0,
  94         6,      /* 3 - Sat */
  95         4,      /* 4 - Thu */
  96         0,
  97         5,      /* 6 - Fri */
  98         0,      /* 7 - Sun */
  99         2,      /* 8 - Tue */
 100         1       /* 9 - Mon */,
 101         0,
 102         3       /*11 - Wed */
 103 };
 104
 105 /* The SET* macros will parse for the appropriate field, and leave the
 106  * cp pointer at the first character after the desired field. Be
 107  * careful with variable-length fields or alpha-num mixes.
 108
 109  * The SKIP* macros skip over characters of a particular class and
 110  * leave cp at the position of the first character that doesn't match
 111  * that class. Correspondingly, SKIPTO* skips until it reaches a
 112  * character of a particular class.
 113  */
 114
 115 #define INIT()       { cp = yytext;}
 116 #define SETWDAY()    { tw.tw_wday= day_map[(cp[0] & 7) + (cp[1] & 4)]; \
 117                        tw.tw_flags &= ~TW_SDAY; tw.tw_flags |= TW_SEXP; \
 118                        SKIPA(); }
 119 #define SETMON()     { cp++; \
 120                        tw.tw_mon = month_map[(cp[0] + cp[1]) & 0x1f]; \
 121                        SKIPA(); }
 122 #define SETMON_NUM() { tw.tw_mon = atoi(cp)-1; \
 123                        SKIPD(); }
 124 #define SETYEAR()    { tw.tw_year = atoi(cp); \
 125                        SKIPD(); }
 126 #define SETDAY()     { tw.tw_mday = atoi(cp); \
 127                        tw.tw_flags |= TW_YES; \
 128                        SKIPD(); }
 129 #define SETTIME()    { tw.tw_hour = atoi(cp); \
 130                        cp += 2; \
 131                        SKIPTOD(); \
 132                        tw.tw_min = atoi(cp); \
 133                        cp += 2; \
 134                        if(*cp == ':') { \
 135                           tw.tw_sec = atoi(++cp); SKIPD(); } }
 136 #define SETZONE(x)   { tw.tw_zone = ((x)/100)*60+(x)%100; \
 137                        tw.tw_flags |= TW_SZEXP; \
 138                        SKIPD(); }
 139 #define SETDST()     { tw.tw_flags |= TW_DST; }
 140 #define SKIPD()      { while ( isdigit(*cp++) ) ; \
 141                        --cp; }
 142 #define SKIPTOD()    { while ( !isdigit(*cp++) ) ; \
 143                        --cp; }
 144 #define SKIPA()      { while ( isalpha(*cp++) ) ; \
 145                        --cp; }
 146 #define SKIPTOA()    { while ( !isalpha(*cp++) ) ; \
 147                        --cp; }
 148 #define SKIPSP()     { while ( isspace(*cp++) ) ; \
 149                        --cp; }
 150 #define SKIPTOSP()   { while ( !isspace(*cp++) ) ; \
 151                        --cp; }
 152
 153 #ifdef ADJUST_NUMERIC_ONLY_TZ_OFFSETS_WRT_DST
 154 # ifdef TIME_WITH_SYS_TIME
 155 #  include <sys/time.h>
 156 #  include <time.h>
 157 # else
 158 #  ifdef HAVE_SYS_TIME_H
 159 #   include <sys/time.h>
 160 #  else
 161 #   include <time.h>
 162 #  endif
 163 # endif
 164
 165 static void
 166 zonehack (struct tws *tw)
 167 {
 168     register struct tm *tm;
 169
 170     if (dmktime (tw) == (time_t) -1)
 171         return;
 172
 173     tm = localtime (&tw->tw_clock);
 174     if (tm->tm_isdst) {
 175         tw->tw_flags |= TW_DST;
 176         tw->tw_zone -= 60;
 177     }
 178 }
 179 #endif  /* ADJUST_NUMERIC_ONLY_TZ_OFFSETS_WRT_DST */
 180 %}
 181
 182 sun     ([Ss]un(day)?)
 183 mon     ([Mm]on(day)?)
 184 tue     ([Tt]ue(sday)?)
 185 wed     ([Ww]ed(nesday)?)
 186 thu     ([Tt]hu(rsday)?)
 187 fri     ([Ff]ri(day)?)
 188 sat     ([Ss]at(urday)?)
 189
 190 DAY     ({sun}|{mon}|{tue}|{wed}|{thu}|{fri}|{sat})
 191
 192 jan     ([Jj]an(uary)?)
 193 feb     ([Ff]eb(ruary)?)
 194 mar     ([Mm]ar(ch)?)
 195 apr     ([Aa]pr(il)?)
 196 may     ([Mm]ay)
 197 jun     ([Jj]un(e)?)
 198 jul     ([Jj]ul(y)?)
 199 aug     ([Aa]ug(ust)?)
 200 sep     ([Ss]ep(tember)?)
 201 oct     ([Oo]ct(ober)?)
 202 nov     ([Nn]ov(ember)?)
 203 dec     ([Dd]ec(ember)?)
 204
 205 MONTH   ({jan}|{feb}|{mar}|{apr}|{may}|{jun}|{jul}|{aug}|{sep}|{oct}|{nov}|{dec})
 206
 207 TIME    ({D}:{d}{d}(:{d}{d})?)
 208
 209      /* The year can either be 2 digits, or 4. However, after
 210         Y2K, we found that some MUA were reporting the year 100, hence
 211         the middle term here. yyterminate() resolves the actual
 212         issues with 2-digit years.
 213      */
 214
 215 YEAR    (({d}{d})|(1{d}{d})|({d}{4}))
 216
 217 w       ([ \t]*)
 218 W       ([ \t]+)
 219 D       ([0-9]?[0-9])
 220 d       [0-9]
 221 nl      [ \t\n()]
 222
 223 %%
 224 %{
 225   /* This section begins the definition of dparsetime().
 226      Put here any local variable definitions and initializations */
 227
 228   YY_BUFFER_STATE lexhandle;
 229
 230   register unsigned char *cp;
 231   static struct tws tw;
 232
 233   memset(&tw,0,sizeof(struct tws));
 234
 235   lexhandle = yy_scan_string(lexstr);
 236 %}
 237
 238 {DAY}","?{W}{MONTH}{W}{D}{W}{TIME}{W}{YEAR}   {
 239                                      INIT();
 240                                      SETWDAY();
 241                                      SKIPTOA();
 242                                      SETMON();
 243                                      SKIPTOD();
 244                                      SETDAY();
 245                                      SKIPTOD();
 246                                      SETTIME();
 247                                      SKIPTOD();
 248                                      SETYEAR();
 249                                      }
 250
 251 {DAY}","?{W}{D}{W}{MONTH}{W}{YEAR}{W}{TIME}   {
 252                                      INIT();
 253                                      SETWDAY();
 254                                      SKIPTOD();
 255                                      SETDAY();
 256                                      SKIPTOA();
 257                                      SETMON();
 258                                      SKIPTOD();
 259                                      SETYEAR();
 260                                      SKIPTOD();
 261                                      SETTIME();
 262                                      }
 263 {D}{W}{MONTH}{W}{YEAR}{W}{TIME}               {
 264                                      INIT();
 265                                      SETDAY();
 266                                      SKIPTOA();
 267                                      SETMON();
 268                                      SKIPTOD();
 269                                      SETYEAR();
 270                                      SKIPTOD();
 271                                      SETTIME();
 272                                      }
 273 {DAY}","?{W}{MONTH}{W}{D}","?{W}{YEAR}","?{W}{TIME} {
 274                                      INIT();
 275                                      SETWDAY();
 276                                      SKIPTOA();
 277                                      SETMON();
 278                                      SKIPTOD();
 279                                      SETDAY();
 280                                      SKIPTOD();
 281                                      SETYEAR();
 282                                      SKIPTOD();
 283                                      SETTIME();
 284                                      }
 285 {DAY}","?{W}{MONTH}{W}{D}","?{W}{YEAR}        {
 286                                      INIT();
 287                                      SETWDAY();
 288                                      SKIPTOA();
 289                                      SETMON();
 290                                      SKIPTOD();
 291                                      SETDAY();
 292                                      SKIPTOD();
 293                                      SETYEAR();
 294                                      }
 295 {MONTH}{W}{D}","?{W}{YEAR}","?{W}{DAY}        {
 296                                      INIT();
 297                                      SETMON();
 298                                      SKIPTOD();
 299                                      SETDAY();
 300                                      SKIPTOD();
 301                                      SETYEAR();
 302                                      SKIPTOA();
 303                                      SETWDAY();
 304                                      }
 305 {MONTH}{W}{D}","?{W}{YEAR}                    {
 306                                      INIT();
 307                                      SETMON();
 308                                      SKIPTOD();
 309                                      SETDAY();
 310                                      SKIPTOD();
 311                                      SETYEAR();
 312                                      }
 313 {D}("-"|"/"){D}("-"|"/"){YEAR}{W}{TIME}       {
 314                                      INIT();
 315                                      if(europeandate) {
 316                                        /* DD/MM/YY */
 317                                      SETDAY();
 318                                      SKIPTOD();
 319                                      SETMON_NUM();
 320                                      } else {
 321                                        /* MM/DD/YY */
 322                                      SETMON_NUM();
 323                                      SKIPTOD();
 324                                      SETDAY();
 325                                      }
 326                                      SKIPTOD();
 327                                      SETYEAR();
 328                                      SKIPTOD();
 329                                      SETTIME();
 330                                      }
 331 {D}("-"|"/"){D}("-"|"/"){YEAR}                {
 332                                      INIT();
 333                                      if(europeandate) {
 334                                        /* DD/MM/YY */
 335                                      SETDAY();
 336                                      SKIPTOD();
 337                                      SETMON_NUM();
 338                                      } else {
 339                                        /* MM/DD/YY */
 340                                      SETMON_NUM();
 341                                      SKIPTOD();
 342                                      SETDAY();
 343                                      }
 344                                      SKIPTOD();
 345                                      SETYEAR();
 346                                      }
 347
 348 "[Aa][Mm]"
 349 "[Pp][Mm]"                           tw.tw_hour += 12;
 350
 351 "+"{D}{d}{d}                                  {
 352                                     INIT();
 353                                     SKIPTOD();
 354                                     SETZONE(atoi(cp));
 355 #ifdef  ADJUST_NUMERIC_ONLY_TZ_OFFSETS_WRT_DST
 356                                     zonehack (&tw);
 357 #endif  /* ADJUST_NUMERIC_ONLY_TZ_OFFSETS_WRT_DST */
 358                                     yyterminate();
 359                                     }
 360 "-"{D}{d}{d}                                  {
 361                                     INIT();
 362                                     SKIPTOD();
 363                                     SETZONE(-atoi(cp));
 364 #ifdef  ADJUST_NUMERIC_ONLY_TZ_OFFSETS_WRT_DST
 365                                     zonehack (&tw);
 366 #endif  /* ADJUST_NUMERIC_ONLY_TZ_OFFSETS_WRT_DST */
 367                                     yyterminate();
 368
 369                                     }
 370 {nl}("ut"|"UT")                     INIT(); SETZONE(0); yyterminate();
 371 {nl}("gmt"|"GMT")                   INIT(); SETZONE(0); yyterminate();
 372 {nl}("est"|"EST")                   INIT(); SETZONE(-500); yyterminate();
 373 {nl}("edt"|"EDT")                   { INIT(); SETDST(); SETZONE(-500);
 374                                       yyterminate(); }
 375 {nl}("cst"|"CST")                   INIT(); SETZONE(-600); yyterminate();
 376 {nl}("cdt"|"CDT")                   { INIT(); SETDST(); SETZONE(-600);
 377                                       yyterminate(); }
 378 {nl}("mst"|"MST")                   INIT(); SETZONE(-700); yyterminate();
 379 {nl}("mdt"|"MDT")                   { INIT(); SETDST(); SETZONE(-700);
 380                                       yyterminate(); }
 381 {nl}("pst"|"PST")                   INIT(); SETZONE(-800); yyterminate();
 382 {nl}("pdt"|"PDT")                   { INIT(); SETDST(); SETZONE(-800);
 383                                       yyterminate(); }
 384 {nl}("nst"|"NST")                   INIT(); SETZONE(-330); yyterminate();
 385 {nl}("ast"|"AST")                   INIT(); SETZONE(-400); yyterminate();
 386 {nl}("adt"|"ADT")                   { INIT(); SETDST(); SETZONE(-400);
 387                                       yyterminate(); }
 388 {nl}("hst"|"HST")                   INIT(); SETZONE(-1000); yyterminate();
 389 {nl}("hdt"|"HDT")                   { INIT(); SETDST(); SETZONE(-1000);
 390                                       yyterminate(); }
 391 .|\n