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

   1 %e 2000
   2 %p 5000
   3 %n 1000
   4 %a 4000
   5 %{
   6 #include <h/nmh.h>
   7 #include <h/tws.h>
   8
   9   /* Since we're looking at a string at a time, don't worry about
  10    *  wrapping to the next buffer.
  11    */
  12 #define yywrap() 1
  13 #define YY_SKIP_YYWRAP
  14
  15 #define YY_NO_UNPUT
  16
  17   /* This is the tricky thing that makes this function cool.  We
  18    *  replace the traditional int yylex(void) declaration with our
  19    *  dparsetime() declaration, essentially piggy-backing off the
  20    *  utility of the yylex() function and adding what we need to make
  21    *  the parsing function useful to us.
  22    */
  23 #define YY_DECL struct tws *dparsetime(char *lexstr)
  24
  25   /* yyerminate() is called after the input string is matched to
  26    * completion (actually, when the lexer reaches an EOF).  The only
  27    * thing that really needs to be in this macro function is the
  28    * return call, which must be substituted inline into dparsetime.
  29    */
  30
  31 #define yyterminate() (void)yy_delete_buffer(lexhandle); \
  32   if(!(tw.tw_flags & TW_SUCC)) { \
  33     return (struct tws *)NULL; \
  34   } \
  35   if(tw.tw_year < 1960) \
  36     tw.tw_year += 1900; \
  37   if(tw.tw_year < 1960) \
  38     tw.tw_year += 100; \
  39   return(&tw)
  40
  41 /*
  42  * Patchable flag that says how to interpret NN/NN/NN dates. When
  43  * true, we do it European style: DD/MM/YY. When false, we do it
  44  * American style: MM/DD/YY.  Of course, these are all non-RFC822
  45  * compliant.
  46  */
  47 int europeandate = 0;
  48
  49 /*
  50  * Table to convert month names to numeric month.  We use the
  51  * fact that the low order 5 bits of the sum of the 2nd & 3rd
  52  * characters of the name is a hash with no collisions for the 12
  53  * valid month names.  (The mask to 5 bits maps any combination of
  54  * upper and lower case into the same hash value).
  55  */
  56 static int month_map[] = {
  57         0,
  58         6,      /* 1 - Jul */
  59         3,      /* 2 - Apr */
  60         5,      /* 3 - Jun */
  61         0,
  62         10,     /* 5 - Nov */
  63         0,
  64         1,      /* 7 - Feb */
  65         11,     /* 8 - Dec */
  66         0,
  67         0,
  68         0,
  69         0,
  70         0,
  71         0,
  72         0,      /*15 - Jan */
  73         0,
  74         0,
  75         0,
  76         2,      /*19 - Mar */
  77         0,
  78         8,      /*21 - Sep */
  79         0,
  80         9,      /*23 - Oct */
  81         0,
  82         0,
  83         4,      /*26 - May */
  84         0,
  85         7       /*28 - Aug */
  86 };
  87
  88 /*
  89  * Same trick for day-of-week using the hash function
  90  *  (c1 & 7) + (c2 & 4)
  91  */
  92 static int day_map[] = {
  93         0,
  94         0,
  95         0,
  96         6,      /* 3 - Sat */
  97         4,      /* 4 - Thu */
  98         0,
  99         5,      /* 6 - Fri */
 100         0,      /* 7 - Sun */
 101         2,      /* 8 - Tue */
 102         1       /* 9 - Mon */,
 103         0,
 104         3       /*11 - Wed */
 105 };
 106
 107 /* The SET* macros will parse for the appropriate field, and leave the
 108  * cp pointer at the first character after the desired field. Be
 109  * careful with variable-length fields or alpha-num mixes.
 110
 111  * The SKIP* macros skip over characters of a particular class and
 112  * leave cp at the position of the first character that doesn't match
 113  * that class. Correspondingly, SKIPTO* skips until it reaches a
 114  * character of a particular class.
 115  */
 116
 117 #define INIT()       { cp = yytext;}
 118 #define SETWDAY()    { cp++; \
 119                        tw.tw_wday= day_map[(cp[0] & 7) + (cp[1] & 4)]; \
 120                        tw.tw_flags &= ~TW_SDAY; tw.tw_flags |= TW_SEXP; \
 121                        SKIPA(); }
 122 #define SETMON()     { cp++; \
 123                        tw.tw_mon = month_map[(cp[0] + cp[1]) & 0x1f]; \
 124                        SKIPA(); }
 125 #define SETMON_NUM() { tw.tw_mon = atoi(cp)-1; \
 126                        SKIPD(); }
 127 #define SETYEAR()    { tw.tw_year = atoi(cp); \
 128                        SKIPD(); }
 129 #define SETDAY()     { tw.tw_mday = atoi(cp); \
 130                        tw.tw_flags |= TW_YES; \
 131                        SKIPD(); }
 132 #define SETTIME()    { tw.tw_hour = atoi(cp); \
 133                        cp += 2; \
 134                        SKIPTOD(); \
 135                        tw.tw_min = atoi(cp); \
 136                        cp += 2; \
 137                        if(*cp == ':') { \
 138                           tw.tw_sec = atoi(++cp); SKIPD(); } }
 139 #define SETZONE(x)   { tw.tw_zone = ((x)/100)*60+(x)%100; \
 140                        tw.tw_flags |= TW_SZEXP; \
 141                        SKIPD(); }
 142 #define SETDST()     { tw.tw_flags |= TW_DST; }
 143 #define SKIPD()      { while ( isdigit(*cp++) ) ; \
 144                        --cp; }
 145 #define SKIPTOD()    { while ( !isdigit(*cp++) ) ; \
 146                        --cp; }
 147 #define SKIPA()      { while ( isalpha(*cp++) ) ; \
 148                        --cp; }
 149 #define SKIPTOA()    { while ( !isalpha(*cp++) ) ; \
 150                        --cp; }
 151 #define SKIPSP()     { while ( isspace(*cp++) ) ; \
 152                        --cp; }
 153 #define SKIPTOSP()   { while ( !isspace(*cp++) ) ; \
 154                        --cp; }
 155 %}
 156
 157 sun     ([Ss]un(day)?)
 158 mon     ([Mm]on(day)?)
 159 tue     ([Tt]ue(sday)?)
 160 wed     ([Ww]ed(nesday)?)
 161 thu     ([Tt]hu(rsday)?)
 162 fri     ([Ff]ri(day)?)
 163 sat     ([Ss]at(urday)?)
 164
 165 DAY     ({sun}|{mon}|{tue}|{wed}|{thu}|{fri}|{sat})
 166
 167 jan     ([Jj]an(uary)?)
 168 feb     ([Ff]eb(ruary)?)
 169 mar     ([Mm]ar(ch)?)
 170 apr     ([Aa]pr(il)?)
 171 may     ([Mm]ay)
 172 jun     ([Jj]un(e)?)
 173 jul     ([Jj]ul(y)?)
 174 aug     ([Aa]ug(ust)?)
 175 sep     ([Ss]ep(tember)?)
 176 oct     ([Oo]ct(ober)?)
 177 nov     ([Nn]ov(ember)?)
 178 dec     ([Dd]ec(ember)?)
 179
 180 MONTH   ({jan}|{feb}|{mar}|{apr}|{may}|{jun}|{jul}|{aug}|{sep}|{oct}|{nov}|{dec})
 181
 182 TIME    ({D}:{d}{d}(:{d}{d})?)
 183
 184      /* The year can either be 2 digits, or 4. However, after
 185         Y2K, we found that some MUA were reporting the year 100, hence
 186         the middle term here. yyterminate() resolves the actual
 187         issues with 2-digit years.
 188      */
 189
 190 YEAR    (({d}{d})|(1{d}{d})|({d}{4}))
 191
 192 w       ([ \t]*)
 193 W       ([ \t]+)
 194 D       ([0-9]?[0-9])
 195 d       [0-9]
 196
 197 %%
 198 %{
 199   /* This section begins the definition of dparsetime().
 200      Put here any local variable definitions and initializations */
 201
 202   YY_BUFFER_STATE lexhandle;
 203
 204   register char *cp;
 205   static struct tws tw;
 206
 207   memset(&tw,0,sizeof(struct tws));
 208
 209   lexhandle = yy_scan_string(lexstr);
 210 %}
 211
 212 {DAY}","?{W}{MONTH}{W}{D}{W}{TIME}{W}{YEAR}   {
 213                                      INIT();
 214                                      SETWDAY();
 215                                      SKIPTOA();
 216                                      SETMON();
 217                                      SKIPTOD();
 218                                      SETDAY();
 219                                      SKIPTOD();
 220                                      SETTIME();
 221                                      SKIPTOD();
 222                                      SETYEAR();
 223                                      }
 224
 225 {DAY}","?{W}{D}{W}{MONTH}{W}{YEAR}{W}{TIME}   {
 226                                      INIT();
 227                                      SETWDAY();
 228                                      SKIPTOD();
 229                                      SETDAY();
 230                                      SKIPTOA();
 231                                      SETMON();
 232                                      SKIPTOD();
 233                                      SETYEAR();
 234                                      SKIPTOD();
 235                                      SETTIME();
 236                                      }
 237 {D}{W}{MONTH}{W}{YEAR}{W}{TIME}               {
 238                                      INIT();
 239                                      SETDAY();
 240                                      SKIPTOA();
 241                                      SETMON();
 242                                      SKIPTOD();
 243                                      SETYEAR();
 244                                      SKIPTOD();
 245                                      SETTIME();
 246                                      }
 247 {DAY}","?{W}{MONTH}{W}{D}","?{W}{YEAR}","?{W}{TIME} {
 248                                      INIT();
 249                                      SETWDAY();
 250                                      SKIPTOA();
 251                                      SETMON();
 252                                      SKIPTOD();
 253                                      SETDAY();
 254                                      SKIPTOD();
 255                                      SETYEAR();
 256                                      SKIPTOD();
 257                                      SETTIME();
 258                                      }
 259 {DAY}","?{W}{MONTH}{W}{D}","?{W}{YEAR}        {
 260                                      INIT();
 261                                      SETWDAY();
 262                                      SKIPTOA();
 263                                      SETMON();
 264                                      SKIPTOD();
 265                                      SETDAY();
 266                                      SKIPTOD();
 267                                      SETYEAR();
 268                                      }
 269 {MONTH}{W}{D}","?{W}{YEAR}","?{W}{DAY}        {
 270                                      INIT();
 271                                      SETMON();
 272                                      SKIPTOD();
 273                                      SETDAY();
 274                                      SKIPTOD();
 275                                      SETYEAR();
 276                                      SKIPTOA();
 277                                      SETWDAY();
 278                                      }
 279 {MONTH}{W}{D}","?{W}{YEAR}                    {
 280                                      INIT();
 281                                      SETMON();
 282                                      SKIPTOD();
 283                                      SETDAY();
 284                                      SKIPTOD();
 285                                      SETYEAR();
 286                                      }
 287 {D}("-"|"/"){D}("-"|"/"){YEAR}{W}{TIME}       {
 288                                      INIT();
 289                                      if(europeandate) {
 290                                        /* DD/MM/YY */
 291                                      SETDAY();
 292                                      SKIPTOD();
 293                                      SETMON_NUM();
 294                                      } else {
 295                                        /* MM/DD/YY */
 296                                      SETMON_NUM();
 297                                      SKIPTOD();
 298                                      SETDAY();
 299                                      }
 300                                      SKIPTOD();
 301                                      SETYEAR();
 302                                      SKIPTOD();
 303                                      SETTIME();
 304                                      }
 305 {D}("-"|"/"){D}("-"|"/"){YEAR}                {
 306                                      INIT();
 307                                      if(europeandate) {
 308                                        /* DD/MM/YY */
 309                                      SETDAY();
 310                                      SKIPTOD();
 311                                      SETMON_NUM();
 312                                      } else {
 313                                        /* MM/DD/YY */
 314                                      SETMON_NUM();
 315                                      SKIPTOD();
 316                                      SETDAY();
 317                                      }
 318                                      SKIPTOD();
 319                                      SETYEAR();
 320                                      }
 321
 322 "[Aa][Mm]"
 323 "[Pp][Mm]"                           tw.tw_hour += 12;
 324
 325 "+"{D}{d}{d}                                  {
 326                                     INIT();
 327                                     SKIPTOD();
 328                                     SETZONE(atoi(cp));
 329                                     }
 330 "-"{D}{d}{d}                                  {
 331                                     INIT();
 332                                     SKIPTOD();
 333                                     SETZONE(-atoi(cp));
 334                                     }
 335 "-"?("ut"|"UT")                     INIT(); SETZONE(0);
 336 "-"?("gmt"|"GMT")                   INIT(); SETZONE(0);
 337 "-"?("jst"|"JST")                   INIT(); SETZONE(200);
 338 "-"?("jdt"|"JDT")                   INIT(); SETDST(); SETZONE(2);
 339 "-"?("est"|"EST")                   INIT(); SETZONE(-500);
 340 "-"?("edt"|"EDT")                   INIT(); SETDST(); SETZONE(-500);
 341 "-"?("cst"|"CST")                   INIT(); SETZONE(-600);
 342 "-"?("cdt"|"CDT")                   INIT(); SETDST(); SETZONE(-600);
 343 "-"?("mst"|"MST")                   INIT(); SETZONE(-700);
 344 "-"?("mdt"|"MDT")                   INIT(); SETDST(); SETZONE(-700);
 345 "-"?("pst"|"PST")                   INIT(); SETZONE(-800);
 346 "-"?("pdt"|"PDT")                   INIT(); SETDST(); SETZONE(-800);
 347 "-"?("nst"|"NST")                   INIT(); SETZONE(-330);
 348 "-"?("ast"|"AST")                   INIT(); SETZONE(-400);
 349 "-"?("adt"|"ADT")                   INIT(); SETDST(); SETZONE(-400);
 350 "-"?("yst"|"YST")                   INIT(); SETZONE(-900);
 351 "-"?("ydt"|"YDT")                   INIT(); SETDST(); SETZONE(-900);
 352 "-"?("hst"|"HST")                   INIT(); SETZONE(-1000);
 353 "-"?("hdt"|"HDT")                   INIT(); SETDST(); SETZONE(-1000);
 354 "-"?("bst"|"BST")                   INIT(); SETDST(); SETZONE(-100);
 355 [a-iA-I]                            {
 356                                        INIT();
 357                                        SETZONE(100*(('a'-1) - tolower(*cp)));
 358                                     }
 359 [k-mK-M]                            {
 360                                        INIT();
 361                                        SETZONE(100*('a' - tolower(*cp)));
 362                                     }
 363 [n-yN-Y]                            {
 364                                        INIT();
 365                                        SETZONE(100*(tolower(*cp) - 'm'));
 366                                     }
 367 .|\n