doc/edit-sgml.c

   1 /*
   2  * $Id$
   3  *
   4  * Copyright © 2003 Keith Packard
   5  *
   6  * Permission to use, copy, modify, distribute, and sell this software and its
   7  * documentation for any purpose is hereby granted without fee, provided that
   8  * the above copyright notice appear in all copies and that both that
   9  * copyright notice and this permission notice appear in supporting
  10  * documentation, and that the name of Keith Packard not be used in
  11  * advertising or publicity pertaining to distribution of the software without
  12  * specific, written prior permission.  Keith Packard makes no
  13  * representations about the suitability of this software for any purpose.  It
  14  * is provided "as is" without express or implied warranty.
  15  *
  16  * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  17  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  18  * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  19  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  20  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  21  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  22  * PERFORMANCE OF THIS SOFTWARE.
  23  */
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <ctype.h>
  29
  30 static void *
  31 New (int size);
  32
  33 static void *
  34 Reallocate (void *p, int size);
  35
  36 static void
  37 Dispose (void *p);
  38
  39 typedef enum { False, True } Bool;
  40
  41 typedef struct {
  42     char    *buf;
  43     int     size;
  44     int     len;
  45 } String;
  46
  47 static String *
  48 StringNew (void);
  49
  50 static void
  51 StringAdd (String *s, char c);
  52
  53 static void
  54 StringAddString (String *s, char *buf);
  55
  56 static String *
  57 StringMake (char *buf);
  58
  59 static void
  60 StringDel (String *s);
  61
  62 static void
  63 StringPut (FILE *f, String *s);
  64
  65 static void
  66 StringDispose (String *s);
  67
  68 typedef struct {
  69     String  *tag;
  70     String  *text;
  71 } Replace;
  72
  73 static Replace *
  74 ReplaceNew (void);
  75
  76 static void
  77 ReplaceDispose (Replace *r);
  78
  79 static void
  80 Bail (const char *format, int line, const char *arg);
  81
  82 static Replace *
  83 ReplaceRead (FILE *f, int *linep);
  84
  85 typedef struct _replaceList {
  86     struct _replaceList *next;
  87     Replace             *r;
  88 } ReplaceList;
  89
  90 static ReplaceList *
  91 ReplaceListNew (Replace *r, ReplaceList *next);
  92
  93 static void
  94 ReplaceListDispose (ReplaceList *l);
  95
  96 typedef struct {
  97     ReplaceList *head;
  98 } ReplaceSet;
  99
 100 static ReplaceSet *
 101 ReplaceSetNew (void);
 102
 103 static void
 104 ReplaceSetDispose (ReplaceSet *s);
 105
 106 static void
 107 ReplaceSetAdd (ReplaceSet *s, Replace *r);
 108
 109 static Replace *
 110 ReplaceSetFind (ReplaceSet *s, char *tag);
 111
 112 static ReplaceSet *
 113 ReplaceSetRead (FILE *f, int *linep);
 114
 115 typedef struct _skipStack {
 116     struct _skipStack   *prev;
 117     int                 skipping;
 118 } SkipStack;
 119
 120 static SkipStack *
 121 SkipStackPush (SkipStack *prev, int skipping);
 122
 123 static SkipStack *
 124 SkipStackPop (SkipStack *prev);
 125
 126 typedef struct _loopStack {
 127     struct _loopStack   *prev;
 128     String              *tag;
 129     String              *extra;
 130     long                pos;
 131 } LoopStack;
 132
 133 static LoopStack *
 134 LoopStackPush (LoopStack *prev, FILE *f, char *tag);
 135
 136 static LoopStack *
 137 LoopStackLoop (ReplaceSet *rs, LoopStack *ls, FILE *f);
 138
 139 static void
 140 LineSkip (FILE *f, int *linep);
 141
 142 static void
 143 DoReplace (FILE *f, int *linep, ReplaceSet *s);
 144
 145 #define STRING_INIT 128
 146
 147 static void *
 148 New (int size)
 149 {
 150     void    *m = malloc (size);
 151     if (!m)
 152         abort ();
 153     return m;
 154 }
 155
 156 static void *
 157 Reallocate (void *p, int size)
 158 {
 159     void    *r = realloc (p, size);
 160
 161     if (!r)
 162         abort ();
 163     return r;
 164 }
 165
 166 static void
 167 Dispose (void *p)
 168 {
 169     free (p);
 170 }
 171
 172 static String *
 173 StringNew (void)
 174 {
 175     String  *s;
 176
 177     s = New (sizeof (String));
 178     s->buf = New (STRING_INIT);
 179     s->size = STRING_INIT - 1;
 180     s->buf[0] = '\0';
 181     s->len = 0;
 182     return s;
 183 }
 184
 185 static void
 186 StringAdd (String *s, char c)
 187 {
 188     if (s->len == s->size)
 189         s->buf = Reallocate (s->buf, (s->size *= 2) + 1);
 190     s->buf[s->len++] = c;
 191     s->buf[s->len] = '\0';
 192 }
 193
 194 static void
 195 StringAddString (String *s, char *buf)
 196 {
 197     while (*buf)
 198         StringAdd (s, *buf++);
 199 }
 200
 201 static String *
 202 StringMake (char *buf)
 203 {
 204     String  *s = StringNew ();
 205     StringAddString (s, buf);
 206     return s;
 207 }
 208
 209 static void
 210 StringDel (String *s)
 211 {
 212     if (s->len)
 213         s->buf[--s->len] = '\0';
 214 }
 215
 216 static void
 217 StringPut (FILE *f, String *s)
 218 {
 219     char    *b = s->buf;
 220
 221     while (*b)
 222         putc (*b++, f);
 223 }
 224
 225 #define StringLast(s)   ((s)->len ? (s)->buf[(s)->len - 1] : '\0')
 226
 227 static void
 228 StringDispose (String *s)
 229 {
 230     Dispose (s->buf);
 231     Dispose (s);
 232 }
 233
 234 static Replace *
 235 ReplaceNew (void)
 236 {
 237     Replace *r = New (sizeof (Replace));
 238     r->tag = StringNew ();
 239     r->text = StringNew ();
 240     return r;
 241 }
 242
 243 static void
 244 ReplaceDispose (Replace *r)
 245 {
 246     StringDispose (r->tag);
 247     StringDispose (r->text);
 248     Dispose (r);
 249 }
 250
 251 static void
 252 Bail (const char *format, int line, const char *arg)
 253 {
 254     fprintf (stderr, "fatal: ");
 255     fprintf (stderr, format, line, arg);
 256     fprintf (stderr, "\n");
 257     exit (1);
 258 }
 259
 260 static int
 261 Getc (FILE *f, int *linep)
 262 {
 263     int c = getc (f);
 264     if (c == '\n')
 265         ++(*linep);
 266 }
 267
 268 static void
 269 Ungetc (int c, FILE *f, int *linep)
 270 {
 271     if (c == '\n')
 272         --(*linep);
 273     ungetc (c, f);
 274 }
 275
 276 static Replace *
 277 ReplaceRead (FILE *f, int *linep)
 278 {
 279     int     c;
 280     Replace *r;
 281
 282     while ((c = Getc (f, linep)) != '@')
 283     {
 284         if (c == EOF)
 285             return 0;
 286     }
 287     r = ReplaceNew();
 288     while ((c = Getc (f, linep)) != '@')
 289     {
 290         if (c == EOF)
 291         {
 292             ReplaceDispose (r);
 293             return 0;
 294         }
 295         if (isspace (c))
 296             Bail ("%d: invalid character after tag %s", *linep, r->tag->buf);
 297         StringAdd (r->tag, c);
 298     }
 299     if (r->tag->buf[0] == '\0')
 300     {
 301         ReplaceDispose (r);
 302         return 0;
 303     }
 304     while (isspace ((c = Getc (f, linep))))
 305         ;
 306     Ungetc (c, f, linep);
 307     while ((c = Getc (f, linep)) != '@' && c != EOF)
 308         StringAdd (r->text, c);
 309     if (c == '@')
 310         Ungetc (c, f, linep);
 311     while (isspace (StringLast (r->text)))
 312         StringDel (r->text);
 313     if (StringLast(r->text) == '%')
 314     {
 315         StringDel (r->text);
 316         StringAdd (r->text, ' ');
 317     }
 318     return r;
 319 }
 320
 321 static ReplaceList *
 322 ReplaceListNew (Replace *r, ReplaceList *next)
 323 {
 324     ReplaceList *l = New (sizeof (ReplaceList));
 325     l->r = r;
 326     l->next = next;
 327     return l;
 328 }
 329
 330 static void
 331 ReplaceListDispose (ReplaceList *l)
 332 {
 333     if (l)
 334     {
 335         ReplaceListDispose (l->next);
 336         ReplaceDispose (l->r);
 337         Dispose (l);
 338     }
 339 }
 340
 341 static ReplaceSet *
 342 ReplaceSetNew (void)
 343 {
 344     ReplaceSet  *s = New (sizeof (ReplaceSet));
 345     s->head = 0;
 346     return s;
 347 }
 348
 349 static void
 350 ReplaceSetDispose (ReplaceSet *s)
 351 {
 352     ReplaceListDispose (s->head);
 353     Dispose (s);
 354 }
 355
 356 static void
 357 ReplaceSetAdd (ReplaceSet *s, Replace *r)
 358 {
 359     s->head = ReplaceListNew (r, s->head);
 360 }
 361
 362 static Replace *
 363 ReplaceSetFind (ReplaceSet *s, char *tag)
 364 {
 365     ReplaceList *l;
 366
 367     for (l = s->head; l; l = l->next)
 368         if (!strcmp (tag, l->r->tag->buf))
 369             return l->r;
 370     return 0;
 371 }
 372
 373 static ReplaceSet *
 374 ReplaceSetRead (FILE *f, int *linep)
 375 {
 376     ReplaceSet  *s = ReplaceSetNew ();
 377     Replace     *r;
 378
 379     while ((r = ReplaceRead (f, linep)))
 380     {
 381         while (ReplaceSetFind (s, r->tag->buf))
 382             StringAdd (r->tag, '+');
 383         ReplaceSetAdd (s, r);
 384     }
 385     if (!s->head)
 386     {
 387         ReplaceSetDispose (s);
 388         s = 0;
 389     }
 390     return s;
 391 }
 392
 393 static SkipStack *
 394 SkipStackPush (SkipStack *prev, int skipping)
 395 {
 396     SkipStack   *ss = New (sizeof (SkipStack));
 397     ss->prev = prev;
 398     ss->skipping = skipping;
 399     return ss;
 400 }
 401
 402 static SkipStack *
 403 SkipStackPop (SkipStack *prev)
 404 {
 405     SkipStack   *ss = prev->prev;
 406     Dispose (prev);
 407     return ss;
 408 }
 409
 410 static LoopStack *
 411 LoopStackPush (LoopStack *prev, FILE *f, char *tag)
 412 {
 413     LoopStack   *ls = New (sizeof (LoopStack));
 414     ls->prev = prev;
 415     ls->tag = StringMake (tag);
 416     ls->extra = StringNew ();
 417     ls->pos = ftell (f);
 418     return ls;
 419 }
 420
 421 static LoopStack *
 422 LoopStackLoop (ReplaceSet *rs, LoopStack *ls, FILE *f)
 423 {
 424     String      *s = StringMake (ls->tag->buf);
 425     LoopStack   *ret = ls;
 426     Bool        loop;
 427
 428     StringAdd (ls->extra, '+');
 429     StringAddString (s, ls->extra->buf);
 430     loop = ReplaceSetFind (rs, s->buf) != 0;
 431     StringDispose (s);
 432     if (loop)
 433         fseek (f, ls->pos, SEEK_SET);
 434     else
 435     {
 436         ret = ls->prev;
 437         StringDispose (ls->tag);
 438         StringDispose (ls->extra);
 439         Dispose (ls);
 440     }
 441     return ret;
 442 }
 443
 444 static void
 445 LineSkip (FILE *f, int *linep)
 446 {
 447     int c;
 448
 449     while ((c = Getc (f, linep)) == '\n')
 450         ;
 451     Ungetc (c, f, linep);
 452 }
 453
 454 static void
 455 DoReplace (FILE *f, int *linep, ReplaceSet *s)
 456 {
 457     int         c;
 458     String      *tag;
 459     Replace     *r;
 460     SkipStack   *ss = 0;
 461     LoopStack   *ls = 0;
 462     int         skipping = 0;
 463
 464     while ((c = Getc (f, linep)) != EOF)
 465     {
 466         if (c == '@')
 467         {
 468             tag = StringNew ();
 469             while ((c = Getc (f, linep)) != '@')
 470             {
 471                 if (c == EOF)
 472                     abort ();
 473                 StringAdd (tag, c);
 474             }
 475             if (ls)
 476                 StringAddString (tag, ls->extra->buf);
 477             switch (tag->buf[0]) {
 478             case '?':
 479                 ss = SkipStackPush (ss, skipping);
 480                 if (!ReplaceSetFind (s, tag->buf + 1))
 481                     skipping++;
 482                 LineSkip (f, linep);
 483                 break;
 484             case ':':
 485                 if (!ss)
 486                     abort ();
 487                 if (ss->skipping == skipping)
 488                     ++skipping;
 489                 else
 490                     --skipping;
 491                 LineSkip (f, linep);
 492                 break;
 493             case ';':
 494                 skipping = ss->skipping;
 495                 ss = SkipStackPop (ss);
 496                 LineSkip (f, linep);
 497                 break;
 498             case '{':
 499                 ls = LoopStackPush (ls, f, tag->buf + 1);
 500                 LineSkip (f, linep);
 501                 break;
 502             case '}':
 503                 ls = LoopStackLoop (s, ls, f);
 504                 LineSkip (f, linep);
 505                 break;
 506             default:
 507                 r = ReplaceSetFind (s, tag->buf);
 508                 if (r && !skipping)
 509                     StringPut (stdout, r->text);
 510                 break;
 511             }
 512             StringDispose (tag);
 513         }
 514         else if (!skipping)
 515             putchar (c);
 516     }
 517 }
 518
 519 int
 520 main (int argc, char **argv)
 521 {
 522     FILE        *f;
 523     ReplaceSet  *s;
 524     int         iline, oline;
 525
 526     if (!argv[1])
 527         Bail ("usage: %s <template.sgml>", 0, argv[0]);
 528     f = fopen (argv[1], "r");
 529     if (!f)
 530     {
 531         Bail ("can't open file %s", 0, argv[1]);
 532         exit (1);
 533     }
 534     iline = 1;
 535     while ((s = ReplaceSetRead (stdin, &iline)))
 536     {
 537         oline = 1;
 538         DoReplace (f, &oline, s);
 539         ReplaceSetDispose (s);
 540         rewind (f);
 541     }
 542     if (ferror (stdout))
 543         Bail ("%s", 0, "error writing output");
 544     exit (0);
 545 }