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 = c_hymark(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 /* return nonzero if it cannot be hyphenated */
 163 static int wb_hyph(char src[][GNLEN], int src_n, char *src_hyph, int flg)
 164 {
 165         char word[WORDLEN * GNLEN];     /* word to pass to hyphenate() */
 166         char hyph[WORDLEN * GNLEN];     /* hyphenation points of word */
 167         int smap[WORDLEN];              /* the mapping from src[] to word[] */
 168         char *s, *d;
 169         int i;
 170         d = word;
 171         *d = '\0';
 172         for (i = 0; i < src_n; i++) {
 173                 s = src[i];
 174                 smap[i] = d - word;
 175                 if (c_hystop(s))
 176                         return 1;
 177                 if (c_hymark(s))
 178                         continue;
 179                 d += hy_cput(d, s);
 180         }
 181         memset(hyph, 0, (d - word) * sizeof(hyph[0]));
 182         hyphenate(hyph, word, flg);
 183         for (i = 0; i < src_n; i++)
 184                 src_hyph[i] = hyph[smap[i]];
 185         return 0;
 186 }
 187
 188 static int wb_collect(struct wb *wb, int val)
 189 {
 190         int old = wb->sub_collect;
 191         wb->sub_collect = val;
 192         return old;
 193 }
 194
 195 /* output the collected characters; only for those present in wb->f font */
 196 static void wb_flushsub(struct wb *wb)
 197 {
 198         struct font *fn;
 199         struct glyph *gsrc[WORDLEN];
 200         struct glyph *gdst[WORDLEN];
 201         int x[WORDLEN], y[WORDLEN], xadv[WORDLEN], yadv[WORDLEN];
 202         int dmap[WORDLEN];
 203         char src_hyph[WORDLEN];
 204         int dst_n, i;
 205         int sidx = 0;
 206         if (!wb->sub_n || !wb->sub_collect)
 207                 return;
 208         wb->sub_collect = 0;
 209         fn = dev_font(wb->f);
 210         if (!n_hy || wb_hyph(wb->sub_c, wb->sub_n, src_hyph, n_hy))
 211                 memset(src_hyph, 0, sizeof(src_hyph));
 212         /* call font_layout() for collected glyphs; skip hyphenation marks */
 213         while (sidx < wb->sub_n) {
 214                 int beg = sidx;
 215                 for (; sidx < wb->sub_n && !c_hymark(wb->sub_c[sidx]); sidx++)
 216                         gsrc[sidx - beg] = font_find(fn, wb->sub_c[sidx]);
 217                 dst_n = font_layout(fn, gsrc, sidx - beg, wb->s,
 218                                 gdst, dmap, x, y, xadv, yadv, n_lg, n_kn);
 219                 for (i = 0; i < dst_n; i++) {
 220                         if (x[i])
 221                                 wb_hmov(wb, font_wid(fn, wb->s, x[i]));
 222                         if (y[i])
 223                                 wb_vmov(wb, font_wid(fn, wb->s, y[i]));
 224                         if (src_hyph[beg + dmap[i]])
 225                                 wb_putbuf(wb, c_hc);
 226                         if (gdst[i] == gsrc[dmap[i]])
 227                                 wb_putbuf(wb, wb->sub_c[beg + dmap[i]]);
 228                         else
 229                                 wb_putbuf(wb, gdst[i]->name);
 230                         if (x[i] || xadv[i])
 231                                 wb_hmov(wb, font_wid(fn, wb->s, xadv[i] - x[i]));
 232                         if (y[i] || yadv[i])
 233                                 wb_vmov(wb, font_wid(fn, wb->s, yadv[i] - y[i]));
 234                 }
 235                 for (; sidx < wb->sub_n && c_hymark(wb->sub_c[sidx]); sidx++)
 236                         wb_putbuf(wb, wb->sub_c[sidx]);
 237         }
 238         wb->sub_n = 0;
 239         wb->icleft = 0;
 240         wb->sub_collect = 1;
 241 }
 242
 243 void wb_put(struct wb *wb, char *c)
 244 {
 245         if (c[0] == '\n') {
 246                 wb->part = 0;
 247                 return;
 248         }
 249         if (c[0] == ' ') {
 250                 wb_flushsub(wb);
 251                 wb_hmov(wb, font_swid(dev_font(R_F(wb)), R_S(wb), n_ss));
 252                 return;
 253         }
 254         if (wb_pendingfont(wb) || wb->sub_n == LEN(wb->sub_c))
 255                 wb_flush(wb);
 256         if (wb->sub_collect) {
 257                 if (font_find(dev_font(wb->f), c) || c_hymark(c))
 258                         strcpy(wb->sub_c[wb->sub_n++], c);
 259                 else
 260                         wb_putraw(wb, c);
 261         } else {
 262                 wb_putbuf(wb, c);
 263         }
 264 }
 265
 266 /* just like wb_put() but disable subword collection */
 267 void wb_putraw(struct wb *wb, char *c)
 268 {
 269         int collect;
 270         wb_flushsub(wb);
 271         collect = wb_collect(wb, 0);
 272         wb_put(wb, c);
 273         wb_collect(wb, collect);
 274 }
 275
 276 /* just like wb_put(), but call cdef_expand() if c is defined */
 277 void wb_putexpand(struct wb *wb, char *c)
 278 {
 279         if (cdef_expand(wb, c, R_F(wb)))
 280                 wb_put(wb, c);
 281 }
 282
 283 int wb_part(struct wb *wb)
 284 {
 285         return wb->part;
 286 }
 287
 288 void wb_setpart(struct wb *wb)
 289 {
 290         wb->part = 1;
 291 }
 292
 293 void wb_drawl(struct wb *wb, int c, int h, int v)
 294 {
 295         wb_flush(wb);
 296         sbuf_printf(&wb->sbuf, "%cD'%c %du %du'", c_ec, c, h, v);
 297         wb->h += h;
 298         wb->v += v;
 299         wb_stsb(wb);
 300 }
 301
 302 void wb_drawc(struct wb *wb, int c, int r)
 303 {
 304         wb_flush(wb);
 305         sbuf_printf(&wb->sbuf, "%cD'%c %du'", c_ec, c, r);
 306         wb->h += r;
 307 }
 308
 309 void wb_drawe(struct wb *wb, int c, int h, int v)
 310 {
 311         wb_flush(wb);
 312         sbuf_printf(&wb->sbuf, "%cD'%c %du %du'", c_ec, c, h, v);
 313         wb->h += h;
 314 }
 315
 316 void wb_drawa(struct wb *wb, int c, int h1, int v1, int h2, int v2)
 317 {
 318         wb_flush(wb);
 319         sbuf_printf(&wb->sbuf, "%cD'%c %du %du %du %du'",
 320                         c_ec, c, h1, v1, h2, v2);
 321         wb->h += h1 + h2;
 322         wb->v += v1 + v2;
 323         wb_stsb(wb);
 324 }
 325
 326 void wb_drawxbeg(struct wb *wb, int c)
 327 {
 328         wb_flush(wb);
 329         sbuf_printf(&wb->sbuf, "%cD'%c", c_ec, c);
 330 }
 331
 332 void wb_drawxdot(struct wb *wb, int h, int v)
 333 {
 334         sbuf_printf(&wb->sbuf, " %du %du", h, v);
 335         wb->h += h;
 336         wb->v += v;
 337         wb_stsb(wb);
 338 }
 339
 340 void wb_drawxend(struct wb *wb)
 341 {
 342         sbuf_printf(&wb->sbuf, "'");
 343 }
 344
 345 void wb_reset(struct wb *wb)
 346 {
 347         wb_done(wb);
 348         wb_init(wb);
 349 }
 350
 351 char *wb_buf(struct wb *wb)
 352 {
 353         wb_flushsub(wb);
 354         return sbuf_buf(&wb->sbuf);
 355 }
 356
 357 static void wb_putc(struct wb *wb, int t, char *s)
 358 {
 359         if (t && t != 'C')
 360                 wb_flushsub(wb);
 361         switch (t) {
 362         case 0:
 363         case 'C':
 364                 wb_put(wb, s);
 365                 break;
 366         case 'D':
 367                 ren_dcmd(wb, s);
 368                 break;
 369         case 'f':
 370                 wb->r_f = atoi(s);
 371                 break;
 372         case 'h':
 373                 wb_hmov(wb, atoi(s));
 374                 break;
 375         case 'm':
 376                 wb->r_m = clr_get(s);
 377                 break;
 378         case 's':
 379                 wb->r_s = atoi(s);
 380                 break;
 381         case 'v':
 382                 wb_vmov(wb, atoi(s));
 383                 break;
 384         case 'x':
 385                 wb_els(wb, atoi(s));
 386                 break;
 387         case 'X':
 388                 wb_etc(wb, s);
 389                 break;
 390         }
 391 }
 392
 393 void wb_cat(struct wb *wb, struct wb *src)
 394 {
 395         char *s;
 396         char d[ILNLEN];
 397         int c, part;
 398         int collect;
 399         wb_flushsub(src);
 400         wb_flushsub(wb);
 401         collect = wb_collect(wb, 0);
 402         s = sbuf_buf(&src->sbuf);
 403         while ((c = escread(&s, d)) >= 0)
 404                 wb_putc(wb, c, d);
 405         part = src->part;
 406         wb->r_s = -1;
 407         wb->r_f = -1;
 408         wb->r_m = -1;
 409         wb_reset(src);
 410         src->part = part;
 411         wb_collect(wb, collect);
 412 }
 413
 414 int wb_wid(struct wb *wb)
 415 {
 416         wb_flushsub(wb);
 417         return wb->h;
 418 }
 419
 420 int wb_hpos(struct wb *wb)
 421 {
 422         wb_flushsub(wb);
 423         return wb->h;
 424 }
 425
 426 int wb_vpos(struct wb *wb)
 427 {
 428         wb_flushsub(wb);
 429         return wb->v;
 430 }
 431
 432 int wb_empty(struct wb *wb)
 433 {
 434         return !wb->sub_n && sbuf_empty(&wb->sbuf);
 435 }
 436
 437 /* return 1 if wb ends a sentence (.?!) */
 438 int wb_eos(struct wb *wb)
 439 {
 440         int i = wb->sub_n - 1;
 441         while (i > 0 && c_eostran(wb->sub_c[i]))
 442                 i--;
 443         return i >= 0 && c_eossent(wb->sub_c[i]);
 444 }
 445
 446 void wb_wconf(struct wb *wb, int *ct, int *st, int *sb,
 447                 int *llx, int *lly, int *urx, int *ury)
 448 {
 449         wb_flushsub(wb);
 450         *ct = wb->ct;
 451         *st = -wb->st;
 452         *sb = -wb->sb;
 453         *llx = wb->llx < BBMAX ? wb->llx : 0;
 454         *lly = wb->lly < BBMAX ? -wb->lly : 0;
 455         *urx = wb->urx > BBMIN ? wb->urx : 0;
 456         *ury = wb->ury > BBMIN ? -wb->ury : 0;
 457 }
 458
 459 static struct glyph *wb_prevglyph(struct wb *wb)
 460 {
 461         return wb->sub_n ? dev_glyph(wb->sub_c[wb->sub_n - 1], wb->f) : NULL;
 462 }
 463
 464 void wb_italiccorrection(struct wb *wb)
 465 {
 466         struct glyph *g = wb_prevglyph(wb);
 467         if (g && glyph_ic(g))
 468                 wb_hmov(wb, font_wid(g->font, wb->s, glyph_ic(g)));
 469 }
 470
 471 void wb_italiccorrectionleft(struct wb *wb)
 472 {
 473         wb_flushsub(wb);
 474         wb->icleft = 1;
 475 }
 476
 477 void wb_fnszget(struct wb *wb, int *fn, int *sz, int *m)
 478 {
 479         wb_flushsub(wb);
 480         *fn = wb->r_f;
 481         *sz = wb->r_s;
 482         *m = wb->r_m;
 483 }
 484
 485 void wb_fnszset(struct wb *wb, int fn, int sz, int m)
 486 {
 487         wb->r_f = fn;
 488         wb->r_s = sz;
 489         wb->r_m = m;
 490 }
 491
 492 void wb_catstr(struct wb *wb, char *s, char *end)
 493 {
 494         char d[ILNLEN];
 495         int collect, c;
 496         wb_flushsub(wb);
 497         collect = wb_collect(wb, 0);
 498         while (s < end && (c = escread(&s, d)) >= 0)
 499                 wb_putc(wb, c, d);
 500         wb_collect(wb, collect);
 501 }
 502
 503 /* return the size of \(hy if appended to wb */
 504 int wb_hywid(struct wb *wb)
 505 {
 506         struct glyph *g = dev_glyph("hy", wb->f);
 507         return g ? font_gwid(g->font, dev_font(wb->f), wb->s, g->wid) : 0;
 508 }