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

   1 /* dtimep.lex exceeds the default table capacities for some old versions
   2  * of lex (and the minimum defaults as specified by POSIX).  The following
   3  * choices meet or exceed the lex defaults for older SunOS4.x, Solaris,
   4  * HPUX, and AIX.
   5  */
   6 %e4000
   7 %p7000
   8 %n2500
   9 %a5000
  10 %{
  11 #include <h/nmh.h>
  12 #include <h/tws.h>
  13
  14   /* Since we're looking at a string at a time, don't worry about
  15    *  wrapping to the next buffer.
  16    */
  17 #define yywrap() 1
  18 #define YY_SKIP_YYWRAP
  19
  20 #define YY_NO_INPUT
  21
  22   /* This is the tricky thing that makes this function cool.  We
  23    *  replace the traditional int yylex(void) declaration with our
  24    *  dparsetime() declaration, essentially piggy-backing off the
  25    *  utility of the yylex() function and adding what we need to make
  26    *  the parsing function useful to us.
  27    */
  28 #define YY_DECL struct tws *dparsetime(char *lexstr)
  29
  30   /* yyerminate() is called after the input string is matched to
  31    * completion (actually, when the lexer reaches an EOF).  The only
  32    * thing that really needs to be in this macro function is the
  33    * return call, which must be substituted inline into dparsetime.
  34    */
  35
  36 #define yyterminate() (void)yy_delete_buffer(lexhandle); \
  37   if(!(tw.tw_flags & TW_SUCC)) { \
  38     return (struct tws *)NULL; \
  39   } \
  40   if(tw.tw_year < 1970) \
  41     tw.tw_year += 1900; \
  42   if(tw.tw_year < 1970) \
  43     tw.tw_year += 100; \
  44   return(&tw)
  45
  46 /*
  47  * Patchable flag that says how to interpret NN/NN/NN dates. When
  48  * true, we do it European style: DD/MM/YY. When false, we do it
  49  * American style: MM/DD/YY.  Of course, these are all non-RFC822
  50  * compliant.
  51  */
  52 int europeandate = 0;
  53
  54 /*
  55  * Table to convert month names to numeric month.  We use the
  56  * fact that the low order 5 bits of the sum of the 2nd & 3rd
  57  * characters of the name is a hash with no collisions for the 12
  58  * valid month names.  (The mask to 5 bits maps any combination of
  59  * upper and lower case into the same hash value).
  60  */
  61 static int month_map[] = {
  62         0,
  63         6,      /* 1 - Jul */
  64         3,      /* 2 - Apr */
  65         5,      /* 3 - Jun */
  66         0,
  67         10,     /* 5 - Nov */
  68         0,
  69         1,      /* 7 - Feb */
  70         11,     /* 8 - Dec */
  71         0,
  72         0,
  73         0,
  74         0,
  75         0,
  76         0,
  77         0,      /*15 - Jan */
  78         0,
  79         0,
  80         0,
  81         2,      /*19 - Mar */
  82         0,
  83         8,      /*21 - Sep */
  84         0,
  85         9,      /*23 - Oct */
  86         0,
  87         0,
  88         4,      /*26 - May */
  89         0,
  90         7       /*28 - Aug */
  91 };
  92
  93 /*
  94  * Lookup table for day-of-week using the same hash trick as for above name-of-
  95  * month table, but using the first and second character, not second and third.
  96  *
  97  * Compute index into table using: (day_name[0] & 7) + (day_name[1] & 4)
  98  */
  99 static int day_map[] = {
 100         0,
 101         0,
 102         0,
 103         6,      /* 3 - Sat */
 104         4,      /* 4 - Thu */
 105         0,
 106         5,      /* 6 - Fri */
 107         0,      /* 7 - Sun */
 108         2,      /* 8 - Tue */
 109         1       /* 9 - Mon */,
 110         0,
 111         3       /*11 - Wed */
 112 };
 113
 114 /* The SET* macros will parse for the appropriate field, and leave the
 115  * cp pointer at the first character after the desired field. Be
 116  * careful with variable-length fields or alpha-num mixes.
 117
 118  * The SKIP* macros skip over characters of a particular class and
 119  * leave cp at the position of the first character that doesn't match
 120  * that class. Correspondingly, SKIPTO* skips until it reaches a
 121  * character of a particular class.
 122  */
 123
 124 #define INIT()       { cp = yytext;}
 125 #define SETWDAY()    { tw.tw_wday= day_map[(cp[0] & 7) + (cp[1] & 4)]; \
 126                        tw.tw_flags &= ~TW_SDAY; tw.tw_flags |= TW_SEXP; \
 127                        SKIPA(); }
 128 #define SETMON()     { cp++; \
 129                        tw.tw_mon = month_map[(cp[0] + cp[1]) & 0x1f]; \
 130                        SKIPA(); }
 131 #define SETMON_NUM() { tw.tw_mon = atoi(cp)-1; \
 132                        SKIPD(); }
 133 #define SETYEAR()    { tw.tw_year = atoi(cp); \
 134                        SKIPD(); }
 135 #define SETDAY()     { tw.tw_mday = atoi(cp); \
 136                        tw.tw_flags |= TW_YES; \
 137                        SKIPD(); }
 138 #define SETTIME()    { tw.tw_hour = atoi(cp); \
 139                        cp += 2; \
 140                        SKIPTOD(); \
 141                        tw.tw_min = atoi(cp); \
 142                        cp += 2; \
 143                        if(*cp == ':') { \
 144                           tw.tw_sec = atoi(++cp); SKIPD(); } }
 145 #define SETZONE(x)   { tw.tw_zone = ((x)/100)*60+(x)%100; \
 146                        tw.tw_flags |= TW_SZEXP; \
 147                        SKIPD(); }
 148 #define SETDST()     { tw.tw_flags |= TW_DST; }
 149 #define SKIPD()      { while ( isdigit(*cp++) ) ; \
 150                        --cp; }
 151 #define SKIPTOD()    { while ( !isdigit(*cp++) ) ; \
 152                        --cp; }
 153 #define SKIPA()      { while ( isalpha(*cp++) ) ; \
 154                        --cp; }
 155 #define SKIPTOA()    { while ( !isalpha(*cp++) ) ; \
 156                        --cp; }
 157 #define SKIPSP()     { while ( isspace(*cp++) ) ; \
 158                        --cp; }
 159 #define SKIPTOSP()   { while ( !isspace(*cp++) ) ; \
 160                        --cp; }
 161
 162 #ifdef ADJUST_NUMERIC_ONLY_TZ_OFFSETS_WRT_DST
 163 # ifdef TIME_WITH_SYS_TIME
 164 #  include <sys/time.h>
 165 #  include <time.h>
 166 # else
 167 #  ifdef HAVE_SYS_TIME_H
 168 #   include <sys/time.h>
 169 #  else
 170 #   include <time.h>
 171 #  endif
 172 # endif
 173
 174 static void
 175 zonehack (struct tws *tw)
 176 {
 177     register struct tm *tm;
 178
 179     if (dmktime (tw) == (time_t) -1)
 180         return;
 181
 182     tm = localtime (&tw->tw_clock);
 183     if (tm->tm_isdst) {
 184         tw->tw_flags |= TW_DST;
 185         tw->tw_zone -= 60;
 186     }
 187 }
 188 #endif  /* ADJUST_NUMERIC_ONLY_TZ_OFFSETS_WRT_DST */
 189 %}
 190
 191 sun     ([Ss]un(day)?)
 192 mon     ([Mm]on(day)?)
 193 tue     ([Tt]ue(sday)?)
 194 wed     ([Ww]ed(nesday)?)
 195 thu     ([Tt]hu(rsday)?)
 196 fri     ([Ff]ri(day)?)
 197 sat     ([Ss]at(urday)?)
 198
 199 DAY     ({sun}|{mon}|{tue}|{wed}|{thu}|{fri}|{sat})
 200
 201 jan     ([Jj]an(uary)?)
 202 feb     ([Ff]eb(ruary)?)
 203 mar     ([Mm]ar(ch)?)
 204 apr     ([Aa]pr(il)?)
 205 may     ([Mm]ay)
 206 jun     ([Jj]un(e)?)
 207 jul     ([Jj]ul(y)?)
 208 aug     ([Aa]ug(ust)?)
 209 sep     ([Ss]ep(tember)?)
 210 oct     ([Oo]ct(ober)?)
 211 nov     ([Nn]ov(ember)?)
 212 dec     ([Dd]ec(ember)?)
 213
 214 MONTH   ({jan}|{feb}|{mar}|{apr}|{may}|{jun}|{jul}|{aug}|{sep}|{oct}|{nov}|{dec})
 215
 216 TIME    ({D}:{d}{d}(:{d}{d})?)
 217
 218      /* The year can either be 2 digits, or 4. However, after
 219         Y2K, we found that some MUA were reporting the year 100, hence
 220         the middle term here. yyterminate() resolves the actual
 221         issues with 2-digit years.
 222      */
 223
 224 YEAR    (({d}{d})|(1{d}{d})|({d}{4}))
 225
 226 w       ([ \t]*)
 227 W       ([ \t]+)
 228 D       ([0-9]?[0-9])
 229 d       [0-9]
 230 nl      [ \t\n()]
 231
 232 %%
 233 %{
 234   /* This section begins the definition of dparsetime().
 235      Put here any local variable definitions and initializations */
 236
 237   YY_BUFFER_STATE lexhandle;
 238
 239   register unsigned char *cp;
 240   static struct tws tw;
 241
 242   memset(&tw,0,sizeof(struct tws));
 243
 244   lexhandle = yy_scan_string(lexstr);
 245 %}
 246
 247 {DAY}","?{W}{MONTH}{W}{D}{W}{TIME}{W}{YEAR}   {
 248                                      INIT();
 249                                      SETWDAY();
 250                                      SKIPTOA();
 251                                      SETMON();
 252                                      SKIPTOD();
 253                                      SETDAY();
 254                                      SKIPTOD();
 255                                      SETTIME();
 256                                      SKIPTOD();
 257                                      SETYEAR();
 258                                      }
 259
 260 {DAY}","?{W}{D}{W}{MONTH}{W}{YEAR}{W}{TIME}   {
 261                                      INIT();
 262                                      SETWDAY();
 263                                      SKIPTOD();
 264                                      SETDAY();
 265                                      SKIPTOA();
 266                                      SETMON();
 267                                      SKIPTOD();
 268                                      SETYEAR();
 269                                      SKIPTOD();
 270                                      SETTIME();
 271                                      }
 272 {D}{W}{MONTH}{W}{YEAR}{W}{TIME}               {
 273                                      INIT();
 274                                      SETDAY();
 275                                      SKIPTOA();
 276                                      SETMON();
 277                                      SKIPTOD();
 278                                      SETYEAR();
 279                                      SKIPTOD();
 280                                      SETTIME();
 281                                      }
 282 {DAY}","?{W}{MONTH}{W}{D}","?{W}{YEAR}","?{W}{TIME} {
 283                                      INIT();
 284                                      SETWDAY();
 285                                      SKIPTOA();
 286                                      SETMON();
 287                                      SKIPTOD();
 288                                      SETDAY();
 289                                      SKIPTOD();
 290                                      SETYEAR();
 291                                      SKIPTOD();
 292                                      SETTIME();
 293                                      }
 294 {DAY}","?{W}{MONTH}{W}{D}","?{W}{YEAR}        {
 295                                      INIT();
 296                                      SETWDAY();
 297                                      SKIPTOA();
 298                                      SETMON();
 299                                      SKIPTOD();
 300                                      SETDAY();
 301                                      SKIPTOD();
 302                                      SETYEAR();
 303                                      }
 304 {MONTH}{W}{D}","?{W}{YEAR}","?{W}{DAY}        {
 305                                      INIT();
 306                                      SETMON();
 307                                      SKIPTOD();
 308                                      SETDAY();
 309                                      SKIPTOD();
 310                                      SETYEAR();
 311                                      SKIPTOA();
 312                                      SETWDAY();
 313                                      }
 314 {MONTH}{W}{D}","?{W}{YEAR}                    {
 315                                      INIT();
 316                                      SETMON();
 317                                      SKIPTOD();
 318                                      SETDAY();
 319                                      SKIPTOD();
 320                                      SETYEAR();
 321                                      }
 322 {D}("-"|"/"){D}("-"|"/"){YEAR}{W}{TIME}       {
 323                                      INIT();
 324                                      if(europeandate) {
 325                                        /* DD/MM/YY */
 326                                      SETDAY();
 327                                      SKIPTOD();
 328                                      SETMON_NUM();
 329                                      } else {
 330                                        /* MM/DD/YY */
 331                                      SETMON_NUM();
 332                                      SKIPTOD();
 333                                      SETDAY();
 334                                      }
 335                                      SKIPTOD();
 336                                      SETYEAR();
 337                                      SKIPTOD();
 338                                      SETTIME();
 339                                      }
 340 {D}("-"|"/"){D}("-"|"/"){YEAR}                {
 341                                      INIT();
 342                                      if(europeandate) {
 343                                        /* DD/MM/YY */
 344                                      SETDAY();
 345                                      SKIPTOD();
 346                                      SETMON_NUM();
 347                                      } else {
 348                                        /* MM/DD/YY */
 349                                      SETMON_NUM();
 350                                      SKIPTOD();
 351                                      SETDAY();
 352                                      }
 353                                      SKIPTOD();
 354                                      SETYEAR();
 355                                      }
 356
 357 "[Aa][Mm]"
 358 "[Pp][Mm]"                           tw.tw_hour += 12;
 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 "-"{D}{d}{d}                                  {
 370                                     INIT();
 371                                     SKIPTOD();
 372                                     SETZONE(-atoi(cp));
 373 #ifdef  ADJUST_NUMERIC_ONLY_TZ_OFFSETS_WRT_DST
 374                                     zonehack (&tw);
 375 #endif  /* ADJUST_NUMERIC_ONLY_TZ_OFFSETS_WRT_DST */
 376                                     yyterminate();
 377
 378                                     }
 379 {nl}("ut"|"UT")                     INIT(); SETZONE(0); yyterminate();
 380 {nl}("gmt"|"GMT")                   INIT(); SETZONE(0); yyterminate();
 381 {nl}("est"|"EST")                   INIT(); SETZONE(-500); yyterminate();
 382 {nl}("edt"|"EDT")                   { INIT(); SETDST(); SETZONE(-500);
 383                                       yyterminate(); }
 384 {nl}("cst"|"CST")                   INIT(); SETZONE(-600); yyterminate();
 385 {nl}("cdt"|"CDT")                   { INIT(); SETDST(); SETZONE(-600);
 386                                       yyterminate(); }
 387 {nl}("mst"|"MST")                   INIT(); SETZONE(-700); yyterminate();
 388 {nl}("mdt"|"MDT")                   { INIT(); SETDST(); SETZONE(-700);
 389                                       yyterminate(); }
 390 {nl}("pst"|"PST")                   INIT(); SETZONE(-800); yyterminate();
 391 {nl}("pdt"|"PDT")                   { INIT(); SETDST(); SETZONE(-800);
 392                                       yyterminate(); }
 393 {nl}("nst"|"NST")                   INIT(); SETZONE(-330); yyterminate();
 394 {nl}("ast"|"AST")                   INIT(); SETZONE(-400); yyterminate();
 395 {nl}("adt"|"ADT")                   { INIT(); SETDST(); SETZONE(-400);
 396                                       yyterminate(); }
 397 {nl}("hst"|"HST")                   INIT(); SETZONE(-1000); yyterminate();
 398 {nl}("hdt"|"HDT")                   { INIT(); SETDST(); SETZONE(-1000);
 399                                       yyterminate(); }
 400 .|\n
 401
 402 %%
 403 /* This is a portable way to squash a warning about the yyunput()
 404  * function being static but never used. It costs us a tiny amount
 405  * of extra code in the binary but the other options are:
 406  *  "%option nounput" which is flex-specific
 407  *  makefile hackery just to compile dtimep.c with different flags
 408  */
 409 void dtimep_yyunput(int c)
 410 {
 411     unput(c);
 412 }
 413