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, const char *arg);
  81
  82 static Replace *
  83 ReplaceRead (FILE *f);
  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);
 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);
 141
 142 static void
 143 DoReplace (FILE *f, 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, const char *arg)
 253 {
 254     fprintf (stderr, "fatal: ");
 255     fprintf (stderr, format, arg);
 256     fprintf (stderr, "\n");
 257     exit (1);
 258 }
 259
 260 static Replace *
 261 ReplaceRead (FILE *f)
 262 {
 263     int     c;
 264     Replace *r;
 265
 266     while ((c = getc (f)) != '@')
 267     {
 268         if (c == EOF)
 269             return 0;
 270     }
 271     r = ReplaceNew();
 272     while ((c = getc (f)) != '@')
 273     {
 274         if (c == EOF)
 275         {
 276             ReplaceDispose (r);
 277             return 0;
 278         }
 279         if (isspace (c))
 280             Bail ("invalid character after tag %s", r->tag->buf);
 281         StringAdd (r->tag, c);
 282     }
 283     if (r->tag->buf[0] == '\0')
 284     {
 285         ReplaceDispose (r);
 286         return 0;
 287     }
 288     while (isspace ((c = getc (f))))
 289         ;
 290     ungetc (c, f);
 291     while ((c = getc (f)) != '@' && c != EOF)
 292         StringAdd (r->text, c);
 293     if (c == '@')
 294         ungetc (c, f);
 295     while (isspace (StringLast (r->text)))
 296         StringDel (r->text);
 297     if (StringLast(r->text) == '%')
 298     {
 299         StringDel (r->text);
 300         StringAdd (r->text, ' ');
 301     }
 302     return r;
 303 }
 304
 305 static ReplaceList *
 306 ReplaceListNew (Replace *r, ReplaceList *next)
 307 {
 308     ReplaceList *l = New (sizeof (ReplaceList));
 309     l->r = r;
 310     l->next = next;
 311     return l;
 312 }
 313
 314 static void
 315 ReplaceListDispose (ReplaceList *l)
 316 {
 317     if (l)
 318     {
 319         ReplaceListDispose (l->next);
 320         ReplaceDispose (l->r);
 321         Dispose (l);
 322     }
 323 }
 324
 325 static ReplaceSet *
 326 ReplaceSetNew (void)
 327 {
 328     ReplaceSet  *s = New (sizeof (ReplaceSet));
 329     s->head = 0;
 330     return s;
 331 }
 332
 333 static void
 334 ReplaceSetDispose (ReplaceSet *s)
 335 {
 336     ReplaceListDispose (s->head);
 337     Dispose (s);
 338 }
 339
 340 static void
 341 ReplaceSetAdd (ReplaceSet *s, Replace *r)
 342 {
 343     s->head = ReplaceListNew (r, s->head);
 344 }
 345
 346 static Replace *
 347 ReplaceSetFind (ReplaceSet *s, char *tag)
 348 {
 349     ReplaceList *l;
 350
 351     for (l = s->head; l; l = l->next)
 352         if (!strcmp (tag, l->r->tag->buf))
 353             return l->r;
 354     return 0;
 355 }
 356
 357 static ReplaceSet *
 358 ReplaceSetRead (FILE *f)
 359 {
 360     ReplaceSet  *s = ReplaceSetNew ();
 361     Replace     *r;
 362
 363     while ((r = ReplaceRead (f)))
 364     {
 365         while (ReplaceSetFind (s, r->tag->buf))
 366             StringAdd (r->tag, '+');
 367         ReplaceSetAdd (s, r);
 368     }
 369     if (!s->head)
 370     {
 371         ReplaceSetDispose (s);
 372         s = 0;
 373     }
 374     return s;
 375 }
 376
 377 static SkipStack *
 378 SkipStackPush (SkipStack *prev, int skipping)
 379 {
 380     SkipStack   *ss = New (sizeof (SkipStack));
 381     ss->prev = prev;
 382     ss->skipping = skipping;
 383     return ss;
 384 }
 385
 386 static SkipStack *
 387 SkipStackPop (SkipStack *prev)
 388 {
 389     SkipStack   *ss = prev->prev;
 390     Dispose (prev);
 391     return ss;
 392 }
 393
 394 static LoopStack *
 395 LoopStackPush (LoopStack *prev, FILE *f, char *tag)
 396 {
 397     LoopStack   *ls = New (sizeof (LoopStack));
 398     ls->prev = prev;
 399     ls->tag = StringMake (tag);
 400     ls->extra = StringNew ();
 401     ls->pos = ftell (f);
 402     return ls;
 403 }
 404
 405 static LoopStack *
 406 LoopStackLoop (ReplaceSet *rs, LoopStack *ls, FILE *f)
 407 {
 408     String      *s = StringMake (ls->tag->buf);
 409     LoopStack   *ret = ls;
 410     Bool        loop;
 411
 412     StringAdd (ls->extra, '+');
 413     StringAddString (s, ls->extra->buf);
 414     loop = ReplaceSetFind (rs, s->buf) != 0;
 415     StringDispose (s);
 416     if (loop)
 417         fseek (f, ls->pos, SEEK_SET);
 418     else
 419     {
 420         ret = ls->prev;
 421         StringDispose (ls->tag);
 422         StringDispose (ls->extra);
 423         Dispose (ls);
 424     }
 425     return ret;
 426 }
 427
 428 static void
 429 LineSkip (FILE *f)
 430 {
 431     int c;
 432
 433     while ((c = getc (f)) == '\n')
 434         ;
 435     ungetc (c, f);
 436 }
 437
 438 static void
 439 DoReplace (FILE *f, ReplaceSet *s)
 440 {
 441     int         c;
 442     String      *tag;
 443     Replace     *r;
 444     SkipStack   *ss = 0;
 445     LoopStack   *ls = 0;
 446     int         skipping = 0;
 447
 448     while ((c = getc (f)) != EOF)
 449     {
 450         if (c == '@')
 451         {
 452             tag = StringNew ();
 453             while ((c = getc (f)) != '@')
 454             {
 455                 if (c == EOF)
 456                     abort ();
 457                 StringAdd (tag, c);
 458             }
 459             if (ls)
 460                 StringAddString (tag, ls->extra->buf);
 461             switch (tag->buf[0]) {
 462             case '?':
 463                 ss = SkipStackPush (ss, skipping);
 464                 if (!ReplaceSetFind (s, tag->buf + 1))
 465                     skipping++;
 466                 LineSkip (f);
 467                 break;
 468             case ':':
 469                 if (!ss)
 470                     abort ();
 471                 if (ss->skipping == skipping)
 472                     ++skipping;
 473                 else
 474                     --skipping;
 475                 LineSkip (f);
 476                 break;
 477             case ';':
 478                 skipping = ss->skipping;
 479                 ss = SkipStackPop (ss);
 480                 LineSkip (f);
 481                 break;
 482             case '{':
 483                 ls = LoopStackPush (ls, f, tag->buf + 1);
 484                 LineSkip (f);
 485                 break;
 486             case '}':
 487                 ls = LoopStackLoop (s, ls, f);
 488                 LineSkip (f);
 489                 break;
 490             default:
 491                 r = ReplaceSetFind (s, tag->buf);
 492                 if (r && !skipping)
 493                     StringPut (stdout, r->text);
 494                 break;
 495             }
 496             StringDispose (tag);
 497         }
 498         else if (!skipping)
 499             putchar (c);
 500     }
 501 }
 502
 503 int
 504 main (int argc, char **argv)
 505 {
 506     FILE        *f;
 507     ReplaceSet  *s;
 508
 509     if (!argv[1])
 510         Bail ("usage: %s <template.sgml>", argv[0]);
 511     f = fopen (argv[1], "r");
 512     if (!f)
 513     {
 514         Bail ("can't open file %s", argv[1]);
 515         exit (1);
 516     }
 517     while ((s = ReplaceSetRead (stdin)))
 518     {
 519         DoReplace (f, s);
 520         ReplaceSetDispose (s);
 521         rewind (f);
 522     }
 523     if (ferror (stdout))
 524         Bail ("%s", "error writing output");
 525     exit (0);
 526 }