wb.c

   1 /* word buffer */
   2 #include <ctype.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include "roff.h"
   7
   8 /* the current font, size and color */
   9 #define R_F(wb)         ((wb)->r_f >= 0 ? (wb)->r_f : n_f)      /* current font */
  10 #define R_S(wb)         ((wb)->r_s >= 0 ? (wb)->r_s : n_s)      /* current size */
  11 #define R_M(wb)         ((wb)->r_m >= 0 ? (wb)->r_m : n_m)      /* current color */
  12 /* italic correction */
  13 #define glyph_ic(g)     (MAX(0, (g)->urx - (g)->wid))
  14 #define glyph_icleft(g) (MAX(0, -(g)->llx))
  15 /* the maximum and minimum values of bounding box coordinates */
  16 #define BBMAX           (1 << 29)
  17 #define BBMIN           -BBMAX
  18
  19 static void wb_flushsub(struct wb *wb);
  20
  21 void wb_init(struct wb *wb)
  22 {
  23         memset(wb, 0, sizeof(*wb));
  24         sbuf_init(&wb->sbuf);
  25         wb->sub_collect = 1;
  26         wb->f = -1;
  27         wb->s = -1;
  28         wb->m = -1;
  29         wb->r_f = -1;
  30         wb->r_s = -1;
  31         wb->r_m = -1;
  32         wb->llx = BBMAX;
  33         wb->lly = BBMAX;
  34         wb->urx = BBMIN;
  35         wb->ury = BBMIN;
  36 }
  37
  38 void wb_done(struct wb *wb)
  39 {
  40         sbuf_done(&wb->sbuf);
  41 }
  42
  43 /* update wb->st and wb->sb */
  44 static void wb_stsb(struct wb *wb)
  45 {
  46         wb->st = MIN(wb->st, wb->v - (wb->s * SC_IN / 72));
  47         wb->sb = MAX(wb->sb, wb->v);
  48 }
  49
  50 /* update bounding box */
  51 static void wb_bbox(struct wb *wb, int llx, int lly, int urx, int ury)
  52 {
  53         wb->llx = MIN(wb->llx, wb->h + llx);
  54         wb->lly = MIN(wb->lly, -wb->v + lly);
  55         wb->urx = MAX(wb->urx, wb->h + urx);
  56         wb->ury = MAX(wb->ury, -wb->v + ury);
  57 }
  58
  59 /* pending font, size or color changes */
  60 static int wb_pendingfont(struct wb *wb)
  61 {
  62         return wb->f != R_F(wb) || wb->s != R_S(wb) ||
  63                         (!n_cp && wb->m != R_M(wb));
  64 }
  65
  66 /* append font and size to the buffer if needed */
  67 static void wb_flushfont(struct wb *wb)
  68 {
  69         if (wb->f != R_F(wb)) {
  70                 sbuf_printf(&wb->sbuf, "%cf(%02d", c_ec, R_F(wb));
  71                 wb->f = R_F(wb);
  72         }
  73         if (wb->s != R_S(wb)) {
  74                 sbuf_printf(&wb->sbuf, "%cs(%02d", c_ec, R_S(wb));
  75                 wb->s = R_S(wb);
  76         }
  77         if (!n_cp && wb->m != R_M(wb)) {
  78                 sbuf_printf(&wb->sbuf, "%cm[%s]", c_ec, clr_str(R_M(wb)));
  79                 wb->m = R_M(wb);
  80         }
  81         wb_stsb(wb);
  82 }
  83
  84 /* apply font and size changes and flush the collected subword */
  85 static void wb_flush(struct wb *wb)
  86 {
  87         wb_flushsub(wb);
  88         wb_flushfont(wb);
  89 }
  90
  91 void wb_hmov(struct wb *wb, int n)
  92 {
  93         wb_flushsub(wb);
  94         wb->h += n;
  95         sbuf_printf(&wb->sbuf, "%ch'%du'", c_ec, n);
  96 }
  97
  98 void wb_vmov(struct wb *wb, int n)
  99 {
 100         wb_flushsub(wb);
 101         wb->v += n;
 102         sbuf_printf(&wb->sbuf, "%cv'%du'", c_ec, n);
 103 }
 104
 105 void wb_els(struct wb *wb, int els)
 106 {
 107         wb_flushsub(wb);
 108         if (els > wb->els_pos)
 109                 wb->els_pos = els;
 110         if (els < wb->els_neg)
 111                 wb->els_neg = els;
 112         sbuf_printf(&wb->sbuf, "%cx'%du'", c_ec, els);
 113 }
 114
 115 void wb_etc(struct wb *wb, char *x)
 116 {
 117         wb_flush(wb);
 118         sbuf_printf(&wb->sbuf, "%cX\x02%s\x02", c_ec, x);
 119 }
 120
 121 static void wb_putbuf(struct wb *wb, char *c)
 122 {
 123         struct glyph *g;
 124         int zerowidth;
 125         if (c[0] == '\t' || c[0] == '\x01' ||
 126                         (c[0] == c_ni && (c[1] == '\t' || c[1] == '\x01'))) {
 127                 sbuf_append(&wb->sbuf, c);
 128                 return;
 129         }
 130         g = dev_glyph(c, wb->f);
 131         zerowidth = !strcmp(c_hc, c) || !strcmp(c_bp, c);
 132         if (!g && c[0] == c_ec && !zerowidth) { /* unknown escape */
 133                 memmove(c, c + 1, strlen(c));
 134                 g = dev_glyph(c, wb->f);
 135         }
 136         if (g && !zerowidth && wb->icleft && glyph_icleft(g))
 137                 wb_hmov(wb, font_wid(g->font, wb->s, glyph_icleft(g)));
 138         wb->icleft = 0;
 139         if (!c[1] || c[0] == c_ec || c[0] == c_ni || utf8one(c)) {
 140                 if (c[0] == c_ni && c[1] == c_ec)
 141                         sbuf_printf(&wb->sbuf, "%c%c", c_ec, c_ec);
 142                 else
 143                         sbuf_append(&wb->sbuf, c);
 144         } else {
 145                 if (c[1] && !c[2])
 146                         sbuf_printf(&wb->sbuf, "%c(%s", c_ec, c);
 147                 else
 148                         sbuf_printf(&wb->sbuf, "%cC'%s'", c_ec, c);
 149         }
 150         if (!zerowidth) {
 151                 if (!n_cp && g)
 152                         wb_bbox(wb, font_wid(g->font, wb->s, g->llx),
 153                                 font_wid(g->font, wb->s, g->lly),
 154                                 font_wid(g->font, wb->s, g->urx),
 155                                 font_wid(g->font, wb->s, g->ury));
 156                 wb->h += g ? font_gwid(g->font, dev_font(wb->f), wb->s, g->wid) : 0;
 157                 wb->ct |= g ? g->type : 0;
 158                 wb_stsb(wb);
 159         }
 160 }
 161
 162 int c_isdash(char *c)
 163 {
 164         return !strcmp("-", c) || !strcmp("em", c) || !strcmp("hy", c);
 165 }
 166
 167 /* return nonzero if it cannot be hyphenated */
 168 static int wb_hyph(char src[][GNLEN], int src_n, char *src_hyph, int flg)
 169 {
 170         char word[WORDLEN * GNLEN];     /* word to pass to hyphenate() */
 171         char hyph[WORDLEN * GNLEN];     /* hyphenation points of word */
 172         int smap[WORDLEN];              /* the mapping from src[] to word[] */
 173         char *s, *d;
 174         int i;
 175         d = word;
 176         *d = '\0';
 177         for (i = 0; i < src_n; i++) {
 178                 s = src[i];
 179                 smap[i] = d - word;
 180                 if (c_isdash(s) || !strcmp(c_hc, s))
 181                         return 1;
 182                 if (!strcmp(c_bp, s))
 183                         continue;
 184                 if (!utf8one(s) || (!s[1] && !isalpha((unsigned char) s[0])))
 185                         strcpy(d, ".");
 186                 else
 187                         strcpy(d, s);
 188                 d = strchr(d, '\0');
 189         }
 190         memset(hyph, 0, (d - word) * sizeof(hyph[0]));
 191         hyphenate(hyph, word, flg);
 192         for (i = 0; i < src_n; i++)
 193                 src_hyph[i] = hyph[smap[i]];
 194         return 0;
 195 }
 196
 197 static int wb_collect(struct wb *wb, int val)
 198 {
 199         int old = wb->sub_collect;
 200         wb->sub_collect = val;
 201         return old;
 202 }
 203
 204 static void wb_flushsub(struct wb *wb)
 205 {
 206         struct font *fn;
 207         struct glyph *gsrc[WORDLEN];
 208         struct glyph *gdst[WORDLEN];
 209         int x[WORDLEN], y[WORDLEN], xadv[WORDLEN], yadv[WORDLEN];
 210         int dmap[WORDLEN];
 211         char src_hyph[WORDLEN];
 212         int dst_n, i;
 213         if (!wb->sub_n || !wb->sub_collect)
 214                 return;
 215         wb->sub_collect = 0;
 216         fn = dev_font(wb->f);
 217         if (!n_hy || wb_hyph(wb->sub_c, wb->sub_n, src_hyph, n_hy))
 218                 memset(src_hyph, 0, sizeof(src_hyph));
 219         for (i = 0; i < wb->sub_n; i++)
 220                 gsrc[i] = font_find(fn, wb->sub_c[i]);
 221         dst_n = font_layout(fn, gsrc, wb->sub_n, wb->s,
 222                         gdst, dmap, x, y, xadv, yadv, n_lg, n_kn);
 223         for (i = 0; i < dst_n; i++) {
 224                 if (x[i])
 225                         wb_hmov(wb, font_wid(fn, wb->s, x[i]));
 226                 if (y[i])
 227                         wb_vmov(wb, font_wid(fn, wb->s, y[i]));
 228                 if (src_hyph[dmap[i]])
 229                         wb_putbuf(wb, c_hc);
 230                 if (gdst[i] == gsrc[dmap[i]])
 231                         wb_putbuf(wb, wb->sub_c[dmap[i]]);
 232                 else
 233                         wb_putbuf(wb, gdst[i]->name);
 234                 if (x[i] || xadv[i])
 235                         wb_hmov(wb, font_wid(fn, wb->s, xadv[i] - x[i]));
 236                 if (y[i] || yadv[i])
 237                         wb_vmov(wb, font_wid(fn, wb->s, yadv[i] - y[i]));
 238         }
 239         wb->sub_n = 0;
 240         wb->icleft = 0;
 241         wb->sub_collect = 1;
 242 }
 243
 244 void wb_put(struct wb *wb, char *c)
 245 {
 246         if (c[0] == '\n') {
 247                 wb->part = 0;
 248                 return;
 249         }
 250         if (c[0] == ' ') {
 251                 wb_flushsub(wb);
 252                 wb_hmov(wb, font_swid(dev_font(R_F(wb)), R_S(wb), n_ss));
 253                 return;
 254         }
 255         if (wb_pendingfont(wb) || wb->sub_n == LEN(wb->sub_c))
 256                 wb_flush(wb);
 257         if (wb->sub_collect) {
 258                 if (font_find(dev_font(wb->f), c))
 259                         strcpy(wb->sub_c[wb->sub_n++], c);
 260                 else
 261                         wb_putraw(wb, c);
 262         } else {
 263                 wb_putbuf(wb, c);
 264         }
 265 }
 266
 267 /* just like wb_put() but disable subword collection */
 268 void wb_putraw(struct wb *wb, char *c)
 269 {
 270         int collect;
 271         wb_flushsub(wb);
 272         collect = wb_collect(wb, 0);
 273         wb_put(wb, c);
 274         wb_collect(wb, collect);
 275 }
 276
 277 /* just like wb_put(), but call cdef_expand() if c is defined */
 278 void wb_putexpand(struct wb *wb, char *c)
 279 {
 280         if (cdef_expand(wb, c, R_F(wb)))
 281                 wb_put(wb, c);
 282 }
 283
 284 int wb_part(struct wb *wb)
 285 {
 286         return wb->part;
 287 }
 288
 289 void wb_setpart(struct wb *wb)
 290 {
 291         wb->part = 1;
 292 }
 293
 294 void wb_drawl(struct wb *wb, int c, int h, int v)
 295 {
 296         wb_flush(wb);
 297         sbuf_printf(&wb->sbuf, "%cD'%c %du %du'", c_ec, c, h, v);
 298         wb->h += h;
 299         wb->v += v;
 300         wb_stsb(wb);
 301 }
 302
 303 void wb_drawc(struct wb *wb, int c, int r)
 304 {
 305         wb_flush(wb);
 306         sbuf_printf(&wb->sbuf, "%cD'%c %du'", c_ec, c, r);
 307         wb->h += r;
 308 }
 309
 310 void wb_drawe(struct wb *wb, int c, int h, int v)
 311 {
 312         wb_flush(wb);
 313         sbuf_printf(&wb->sbuf, "%cD'%c %du %du'", c_ec, c, h, v);
 314         wb->h += h;
 315 }
 316
 317 void wb_drawa(struct wb *wb, int c, int h1, int v1, int h2, int v2)
 318 {
 319         wb_flush(wb);
 320         sbuf_printf(&wb->sbuf, "%cD'%c %du %du %du %du'",
 321                         c_ec, c, h1, v1, h2, v2);
 322         wb->h += h1 + h2;
 323         wb->v += v1 + v2;
 324         wb_stsb(wb);
 325 }
 326
 327 void wb_drawxbeg(struct wb *wb, int c)
 328 {
 329         wb_flush(wb);
 330         sbuf_printf(&wb->sbuf, "%cD'%c", c_ec, c);
 331 }
 332
 333 void wb_drawxdot(struct wb *wb, int h, int v)
 334 {
 335         sbuf_printf(&wb->sbuf, " %du %du", h, v);
 336         wb->h += h;
 337         wb->v += v;
 338         wb_stsb(wb);
 339 }
 340
 341 void wb_drawxend(struct wb *wb)
 342 {
 343         sbuf_printf(&wb->sbuf, "'");
 344 }
 345
 346 void wb_reset(struct wb *wb)
 347 {
 348         wb_done(wb);
 349         wb_init(wb);
 350 }
 351
 352 char *wb_buf(struct wb *wb)
 353 {
 354         wb_flushsub(wb);
 355         return sbuf_buf(&wb->sbuf);
 356 }
 357
 358 static void wb_putc(struct wb *wb, int t, char *s)
 359 {
 360         if (t && t != 'C')
 361                 wb_flushsub(wb);
 362         switch (t) {
 363         case 0:
 364         case 'C':
 365                 wb_put(wb, s);
 366                 break;
 367         case 'D':
 368                 ren_dcmd(wb, s);
 369                 break;
 370         case 'f':
 371                 wb->r_f = atoi(s);
 372                 break;
 373         case 'h':
 374                 wb_hmov(wb, atoi(s));
 375                 break;
 376         case 'm':
 377                 wb->r_m = clr_get(s);
 378                 break;
 379         case 's':
 380                 wb->r_s = atoi(s);
 381                 break;
 382         case 'v':
 383                 wb_vmov(wb, atoi(s));
 384                 break;
 385         case 'x':
 386                 wb_els(wb, atoi(s));
 387                 break;
 388         case 'X':
 389                 wb_etc(wb, s);
 390                 break;
 391         }
 392 }
 393
 394 void wb_cat(struct wb *wb, struct wb *src)
 395 {
 396         char *s;
 397         char d[ILNLEN];
 398         int c, part;
 399         int collect;
 400         wb_flushsub(src);
 401         wb_flushsub(wb);
 402         collect = wb_collect(wb, 0);
 403         s = sbuf_buf(&src->sbuf);
 404         while ((c = escread(&s, d)) >= 0)
 405                 wb_putc(wb, c, d);
 406         part = src->part;
 407         wb->r_s = -1;
 408         wb->r_f = -1;
 409         wb->r_m = -1;
 410         wb_reset(src);
 411         src->part = part;
 412         wb_collect(wb, collect);
 413 }
 414
 415 int wb_wid(struct wb *wb)
 416 {
 417         wb_flushsub(wb);
 418         return wb->h;
 419 }
 420
 421 int wb_hpos(struct wb *wb)
 422 {
 423         wb_flushsub(wb);
 424         return wb->h;
 425 }
 426
 427 int wb_vpos(struct wb *wb)
 428 {
 429         wb_flushsub(wb);
 430         return wb->v;
 431 }
 432
 433 int wb_empty(struct wb *wb)
 434 {
 435         return !wb->sub_n && sbuf_empty(&wb->sbuf);
 436 }
 437
 438 /* return 1 if wb ends a sentence (.?!) */
 439 int wb_eos(struct wb *wb)
 440 {
 441         int i = wb->sub_n - 1;
 442         while (i > 0 && strchr("'\")]*", wb->sub_c[i][0]))
 443                 i--;
 444         return i >= 0 && strchr(".?!", wb->sub_c[i][0]);
 445 }
 446
 447 void wb_wconf(struct wb *wb, int *ct, int *st, int *sb,
 448                 int *llx, int *lly, int *urx, int *ury)
 449 {
 450         wb_flushsub(wb);
 451         *ct = wb->ct;
 452         *st = -wb->st;
 453         *sb = -wb->sb;
 454         *llx = wb->llx < BBMAX ? wb->llx : 0;
 455         *lly = wb->lly < BBMAX ? -wb->lly : 0;
 456         *urx = wb->urx > BBMIN ? wb->urx : 0;
 457         *ury = wb->ury > BBMIN ? -wb->ury : 0;
 458 }
 459
 460 static struct glyph *wb_prevglyph(struct wb *wb)
 461 {
 462         return wb->sub_n ? dev_glyph(wb->sub_c[wb->sub_n - 1], wb->f) : NULL;
 463 }
 464
 465 void wb_italiccorrection(struct wb *wb)
 466 {
 467         struct glyph *g = wb_prevglyph(wb);
 468         if (g && glyph_ic(g))
 469                 wb_hmov(wb, font_wid(g->font, wb->s, glyph_ic(g)));
 470 }
 471
 472 void wb_italiccorrectionleft(struct wb *wb)
 473 {
 474         wb_flushsub(wb);
 475         wb->icleft = 1;
 476 }
 477
 478 void wb_fnszget(struct wb *wb, int *fn, int *sz, int *m)
 479 {
 480         wb_flushsub(wb);
 481         *fn = wb->r_f;
 482         *sz = wb->r_s;
 483         *m = wb->r_m;
 484 }
 485
 486 void wb_fnszset(struct wb *wb, int fn, int sz, int m)
 487 {
 488         wb->r_f = fn;
 489         wb->r_s = sz;
 490         wb->r_m = m;
 491 }
 492
 493 void wb_catstr(struct wb *wb, char *s, char *end)
 494 {
 495         char d[ILNLEN];
 496         int collect, c;
 497         wb_flushsub(wb);
 498         collect = wb_collect(wb, 0);
 499         while (s < end && (c = escread(&s, d)) >= 0)
 500                 wb_putc(wb, c, d);
 501         wb_collect(wb, collect);
 502 }
 503
 504 /* return the size of \(hy if appended to wb */
 505 int wb_dashwid(struct wb *wb)
 506 {
 507         struct glyph *g = dev_glyph("hy", wb->f);
 508         return g ? font_gwid(g->font, dev_font(wb->f), wb->s, g->wid) : 0;
 509 }