diplodocus.org Git - nmh/blob - docs/historical/mh-6.8.5/zotnet/tws/lexstring.c

   1 #include <stdio.h>
   2 #include <ctype.h>
   3 #ifndef lint
   4 static char ident[] = "@(#)$Id: lexstring.c,v 1.5 1992/12/15 00:20:22 jromine Exp $";
   5 #endif  /* lint */
   6
   7 #define YYLERR yysvec
   8 #define YYTYPE int
   9 #define YYLMAX 256
  10
  11 struct yysvf {
  12 #ifndef hpux
  13         struct yywork *yystoff;
  14 #else   /* hpux */
  15         int yystoff;
  16 #endif  /* hpux */
  17         struct yysvf *yyother;
  18         int *yystops;
  19 };
  20
  21 struct yywork {
  22         YYTYPE  verify;
  23         YYTYPE  advance;
  24 };
  25
  26 extern int yyvstop[];
  27 extern struct yywork yycrank[];
  28 extern struct yysvf yysvec[];
  29 extern char yymatch[];
  30 extern char yyextra[];
  31
  32 #ifdef LEXDEBUG
  33 static int debug = 0;
  34 #endif  /* LEXDEBUG */
  35
  36 #ifdef ONECASE
  37 static char case_map[] = {
  38      0,   1,   2,   3,   4,   5,   6,   7,   8,   9,
  39     10,  11,  12,  13,  14,  15,  16,  17,  18,  19,
  40     20,  21,  22,  23,  24,  25,  26,  27,  28,  29,
  41     30,  31,  32,  33,  34,  35,  36,  37,  38,  39,
  42     40,  41,  42,  43,  44,  45,  46,  47,  48,  49,
  43     50,  51,  52,  53,  54,  55,  56,  57,  58,  59,
  44     60,  61,  62,  63,  64,  97,  98,  99, 100, 101,
  45    102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
  46    112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
  47    122,  91,  92,  93,  94,  95,  96,  97,  98,  99,
  48    100, 101, 102, 103, 104, 105, 106, 107, 108, 109,
  49    110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
  50    120, 121, 122, 123, 124, 125, 126, 127,
  51    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  52    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  53    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  54    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  55    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  56    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  57    0, 0, 0, 0, 0, 0, 0, 0
  58 };
  59 #endif  /* ONECASE */
  60
  61 lex_string( strptr, start_cond)
  62         char    **strptr;
  63         int     start_cond;
  64 {
  65         register struct yysvf *state, **lsp;
  66         register struct yywork *tran;
  67         register int statenum;
  68         register int ch;
  69         register char   *cp = *strptr;
  70         register int    *found;
  71         struct  yysvf *yylstate[YYLMAX];
  72
  73         /* start off machines */
  74         lsp = yylstate;
  75         statenum = 1 + start_cond;
  76         state = yysvec + statenum;
  77         for (;;){
  78 # ifdef LEXDEBUG
  79                 if (debug) {
  80                         fprintf(stderr,"%d ",statenum - 1);
  81                 }
  82 # endif
  83 #ifndef hpux
  84                 tran = state->yystoff;
  85 #else   /* hpux */
  86                 tran = &yycrank[state->yystoff];
  87 #endif  /* hpux */
  88                 if(tran == yycrank)
  89                         /* may not be any transitions */
  90                         if (state->yyother == 0 ||
  91 #ifndef hpux
  92                             state->yyother->yystoff == yycrank)
  93 #else   /* hpux */
  94                             state->yyother->yystoff == 0)
  95 #endif  /* hpux */
  96                                 break;
  97
  98 #ifdef ONECASE
  99                 ch = case_map[*cp++];
 100 #else   /*  not ONECASE */
 101                 ch = *cp++;
 102 #endif  /* ONECASE */
 103 # ifdef LEXDEBUG
 104                 if (debug) {
 105                         fprintf(stderr,"(");
 106                         allprint(ch);
 107                         fprintf(stderr, ")");
 108                 }
 109 # endif
 110 tryagain:
 111 #ifndef hpux
 112                 if ( tran > yycrank){
 113 #else   /* hpux */
 114                 if ( (int)tran > (int)yycrank){
 115 #endif  /* hpux */
 116                         tran += ch;
 117                         if (tran->verify == statenum){
 118                                 if ((statenum = tran->advance) == 0){
 119                                         /* error transitions */
 120                                         --cp;
 121                                         break;
 122                                 }
 123                                 state = statenum + yysvec;
 124                                 *lsp++ = state;
 125                                 goto contin;
 126                         }
 127
 128 #ifndef hpux
 129                 } else if(tran < yycrank) {
 130 #else   /* hpux */
 131                 } else if( (int)tran < (int)yycrank) {
 132 #endif  /* hpux */
 133                         tran = yycrank+(yycrank-tran) + ch;
 134 # ifdef LEXDEBUG
 135                         if (debug) {
 136                                 fprintf(stderr," compressed");
 137                         }
 138 # endif
 139                         if (tran->verify == statenum){
 140                                 if ((statenum = tran->advance) == 0)
 141                                         /* error transitions */
 142                                         break;
 143
 144                                 state = statenum + yysvec;
 145                                 *lsp++ = state;
 146                                 goto contin;
 147                         }
 148                         tran += (yymatch[ch] - ch);
 149 # ifdef LEXDEBUG
 150                         if (debug) {
 151                                 fprintf(stderr,"(fb ");
 152                                 allprint(yymatch[ch]);
 153                                 fprintf(stderr,")");
 154                         }
 155 # endif
 156                         if (tran->verify == statenum){
 157                                 if((statenum = tran->advance) == 0)
 158                                         /* error transition */
 159                                         break;
 160
 161                                 state = statenum + yysvec;
 162                                 *lsp++ = state;
 163                                 goto contin;
 164                         }
 165                 }
 166                 if ((state = state->yyother) &&
 167 #ifndef hpux
 168                     (tran = state->yystoff) != yycrank){
 169 #else   /* hpux */
 170                     (tran = &yycrank[state->yystoff]) != yycrank){
 171 #endif  /* hpux */
 172                         statenum = state - yysvec;
 173 # ifdef LEXDEBUG
 174                         if (debug) {
 175                                 fprintf(stderr,"fb %d", statenum - 1);
 176                         }
 177 # endif
 178                         goto tryagain;
 179                 } else
 180                         break;
 181
 182 contin:
 183 # ifdef LEXDEBUG
 184                 if (debug) {
 185                         fprintf(stderr,">");
 186                 }
 187 # endif
 188                 ;
 189         }
 190 # ifdef LEXDEBUG
 191         if (debug) {
 192                 fprintf(stderr,"\nStopped in state %d (",*(lsp-1)-yysvec-1);
 193                 allprint(ch);
 194                 fprintf(stderr, ") ");
 195         }
 196 # endif
 197         while (lsp-- > yylstate){
 198                 if (*lsp != 0 && (found= (*lsp)->yystops) && *found > 0){
 199                         if(yyextra[*found]){
 200                                 /* must backup */
 201                                 ch = -*found;
 202                                 do {
 203                                         while (*found && *found++ != ch)
 204                                                 ;
 205                                  } while (lsp > yylstate &&
 206                                           (found = (*--lsp)->yystops));
 207                         }
 208 # ifdef LEXDEBUG
 209                         if (debug) {
 210                                 fprintf(stderr," Match \"");
 211                                 for ( cp = *strptr;
 212                                       cp <= ((*strptr)+(lsp-yylstate));
 213                                       cp++)
 214                                         allprint( *cp );
 215                                 fprintf(stderr,"\" action %d\n",*found);
 216                         }
 217 # endif
 218                         *strptr += (lsp - yylstate + 1);
 219                         return(*found);
 220                 }
 221         }
 222         /* the string didn't match anything - if we're looking at
 223          * eos, just return 0.  Otherwise, bump the string pointer
 224          * and return -1.
 225          */
 226 # ifdef LEXDEBUG
 227         if (debug) {
 228                 fprintf(stderr," No match\n");
 229         }
 230 #endif  /* LEXDEBUG */
 231         if ( **strptr ) {
 232                 (*strptr)++;
 233                 return (-1);
 234         }
 235         return (0);
 236 }
 237
 238 #ifdef LEXDEBUG
 239 allprint(c)
 240         char c;
 241 {
 242         if ( c < 32 ) {
 243             putc( '^', stderr );
 244             c += 32;
 245         } else if ( c == 127 ) {
 246             putc( '^', stderr );
 247             c = '?';
 248         }
 249         putc( c, stderr );
 250 }
 251 #endif  /* LEXDEBUG */