Annotation of mandoc/term.c, Revision 1.133
1.133 ! kristaps 1: /* $Id: term.c,v 1.132 2010/05/07 04:50:44 kristaps Exp $ */
1.1 kristaps 2: /*
1.75 kristaps 3: * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
1.1 kristaps 4: *
5: * Permission to use, copy, modify, and distribute this software for any
1.74 kristaps 6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
1.1 kristaps 8: *
1.74 kristaps 9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1 kristaps 16: */
1.128 kristaps 17: #ifdef HAVE_CONFIG_H
18: #include "config.h"
19: #endif
20:
1.126 kristaps 21: #include <sys/types.h>
22:
1.1 kristaps 23: #include <assert.h>
1.122 kristaps 24: #include <ctype.h>
1.22 kristaps 25: #include <stdio.h>
1.1 kristaps 26: #include <stdlib.h>
27: #include <string.h>
1.113 kristaps 28: #include <time.h>
1.1 kristaps 29:
1.101 kristaps 30: #include "chars.h"
1.107 kristaps 31: #include "out.h"
1.71 kristaps 32: #include "term.h"
33: #include "man.h"
34: #include "mdoc.h"
1.105 kristaps 35: #include "main.h"
1.1 kristaps 36:
1.71 kristaps 37: static struct termp *term_alloc(enum termenc);
38: static void term_free(struct termp *);
1.125 kristaps 39: static void spec(struct termp *, const char *, size_t);
40: static void res(struct termp *, const char *, size_t);
41: static void buffera(struct termp *, const char *, size_t);
42: static void bufferc(struct termp *, char);
43: static void adjbuf(struct termp *p, size_t);
44: static void encode(struct termp *, const char *, size_t);
1.1 kristaps 45:
46:
1.71 kristaps 47: void *
48: ascii_alloc(void)
1.10 kristaps 49: {
1.1 kristaps 50:
1.71 kristaps 51: return(term_alloc(TERMENC_ASCII));
1.1 kristaps 52: }
53:
54:
1.99 kristaps 55: void
1.71 kristaps 56: terminal_free(void *arg)
1.11 kristaps 57: {
58:
1.71 kristaps 59: term_free((struct termp *)arg);
1.11 kristaps 60: }
61:
62:
1.71 kristaps 63: static void
64: term_free(struct termp *p)
1.14 kristaps 65: {
66:
1.71 kristaps 67: if (p->buf)
68: free(p->buf);
1.102 kristaps 69: if (p->symtab)
1.101 kristaps 70: chars_free(p->symtab);
1.14 kristaps 71:
1.71 kristaps 72: free(p);
1.14 kristaps 73: }
74:
75:
1.71 kristaps 76: static struct termp *
77: term_alloc(enum termenc enc)
1.14 kristaps 78: {
1.71 kristaps 79: struct termp *p;
1.14 kristaps 80:
1.117 kristaps 81: p = calloc(1, sizeof(struct termp));
82: if (NULL == p) {
1.120 kristaps 83: perror(NULL);
1.117 kristaps 84: exit(EXIT_FAILURE);
85: }
1.71 kristaps 86: p->enc = enc;
87: return(p);
1.14 kristaps 88: }
89:
90:
1.71 kristaps 91: /*
92: * Flush a line of text. A "line" is loosely defined as being something
93: * that should be followed by a newline, regardless of whether it's
94: * broken apart by newlines getting there. A line can also be a
1.130 kristaps 95: * fragment of a columnar list (`Bl -tag' or `Bl -column'), which does
96: * not have a trailing newline.
1.71 kristaps 97: *
1.130 kristaps 98: * The following flags may be specified:
1.71 kristaps 99: *
100: * - TERMP_NOLPAD: when beginning to write the line, don't left-pad the
101: * offset value. This is useful when doing columnar lists where the
102: * prior column has right-padded.
103: *
104: * - TERMP_NOBREAK: this is the most important and is used when making
105: * columns. In short: don't print a newline and instead pad to the
106: * right margin. Used in conjunction with TERMP_NOLPAD.
107: *
1.91 kristaps 108: * - TERMP_TWOSPACE: when padding, make sure there are at least two
109: * space characters of padding. Otherwise, rather break the line.
110: *
1.84 kristaps 111: * - TERMP_DANGLE: don't newline when TERMP_NOBREAK is specified and
112: * the line is overrun, and don't pad-right if it's underrun.
113: *
114: * - TERMP_HANG: like TERMP_DANGLE, but doesn't newline when
115: * overruning, instead save the position and continue at that point
116: * when the next invocation.
1.71 kristaps 117: *
118: * In-line line breaking:
119: *
120: * If TERMP_NOBREAK is specified and the line overruns the right
121: * margin, it will break and pad-right to the right margin after
122: * writing. If maxrmargin is violated, it will break and continue
1.114 kristaps 123: * writing from the right-margin, which will lead to the above scenario
124: * upon exit. Otherwise, the line will break at the right margin.
1.71 kristaps 125: */
126: void
127: term_flushln(struct termp *p)
1.53 kristaps 128: {
1.114 kristaps 129: int i; /* current input position in p->buf */
130: size_t vis; /* current visual position on output */
131: size_t vbl; /* number of blanks to prepend to output */
132: size_t vsz; /* visual characters to write to output */
133: size_t bp; /* visual right border position */
134: int j; /* temporary loop index */
135: size_t maxvis, mmax;
1.53 kristaps 136:
1.71 kristaps 137: /*
138: * First, establish the maximum columns of "visible" content.
139: * This is usually the difference between the right-margin and
140: * an indentation, but can be, for tagged lists or columns, a
1.115 kristaps 141: * small set of values.
1.71 kristaps 142: */
1.53 kristaps 143:
1.71 kristaps 144: assert(p->offset < p->rmargin);
1.92 kristaps 145:
1.129 kristaps 146: maxvis = (int)(p->rmargin - p->offset) - p->overstep < 0 ?
1.119 kristaps 147: /* LINTED */
1.129 kristaps 148: 0 : p->rmargin - p->offset - p->overstep;
149: mmax = (int)(p->maxrmargin - p->offset) - p->overstep < 0 ?
1.119 kristaps 150: /* LINTED */
1.129 kristaps 151: 0 : p->maxrmargin - p->offset - p->overstep;
1.92 kristaps 152:
1.71 kristaps 153: bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
1.115 kristaps 154:
155: /*
156: * FIXME: if bp is zero, we still output the first word before
157: * breaking the line.
158: */
159:
1.71 kristaps 160: vis = 0;
1.84 kristaps 161:
1.71 kristaps 162: /*
163: * If in the standard case (left-justified), then begin with our
164: * indentation, otherwise (columns, etc.) just start spitting
165: * out text.
166: */
1.53 kristaps 167:
1.71 kristaps 168: if ( ! (p->flags & TERMP_NOLPAD))
169: /* LINTED */
170: for (j = 0; j < (int)p->offset; j++)
171: putchar(' ');
172:
173: for (i = 0; i < (int)p->col; i++) {
174: /*
175: * Count up visible word characters. Control sequences
176: * (starting with the CSI) aren't counted. A space
177: * generates a non-printing word, which is valid (the
178: * space is printed according to regular spacing rules).
179: */
180:
181: /* LINTED */
1.132 kristaps 182: for (j = i, vsz = 0; j < (int)p->col; j++) {
1.93 kristaps 183: if (j && ' ' == p->buf[j])
1.71 kristaps 184: break;
1.130 kristaps 185: if (8 == p->buf[j])
1.89 kristaps 186: vsz--;
1.71 kristaps 187: else
188: vsz++;
189: }
1.53 kristaps 190:
1.71 kristaps 191: /*
1.81 kristaps 192: * Choose the number of blanks to prepend: no blank at the
193: * beginning of a line, one between words -- but do not
194: * actually write them yet.
1.71 kristaps 195: */
1.130 kristaps 196:
1.81 kristaps 197: vbl = (size_t)(0 == vis ? 0 : 1);
1.71 kristaps 198:
1.81 kristaps 199: /*
200: * Find out whether we would exceed the right margin.
1.132 kristaps 201: * If so, break to the next line. Otherwise, write the chosen
202: * number of blanks.
1.81 kristaps 203: */
1.130 kristaps 204:
1.81 kristaps 205: if (vis && vis + vbl + vsz > bp) {
206: putchar('\n');
207: if (TERMP_NOBREAK & p->flags) {
208: for (j = 0; j < (int)p->rmargin; j++)
209: putchar(' ');
210: vis = p->rmargin - p->offset;
211: } else {
1.71 kristaps 212: for (j = 0; j < (int)p->offset; j++)
213: putchar(' ');
214: vis = 0;
1.81 kristaps 215: }
1.130 kristaps 216:
1.129 kristaps 217: /* Remove the p->overstep width. */
1.130 kristaps 218:
1.112 kristaps 219: bp += (int)/* LINTED */
1.129 kristaps 220: p->overstep;
221: p->overstep = 0;
1.81 kristaps 222: } else {
223: for (j = 0; j < (int)vbl; j++)
1.71 kristaps 224: putchar(' ');
1.81 kristaps 225: vis += vbl;
1.71 kristaps 226: }
1.53 kristaps 227:
1.130 kristaps 228: /* Write out the [remaining] word. */
229: for ( ; i < (int)p->col; i++)
1.71 kristaps 230: if (' ' == p->buf[i])
231: break;
1.130 kristaps 232: else if (31 == p->buf[i])
1.121 kristaps 233: putchar(' ');
234: else
235: putchar(p->buf[i]);
1.130 kristaps 236:
1.71 kristaps 237: vis += vsz;
238: }
1.111 kristaps 239:
1.91 kristaps 240: p->col = 0;
1.129 kristaps 241: p->overstep = 0;
1.15 kristaps 242:
1.91 kristaps 243: if ( ! (TERMP_NOBREAK & p->flags)) {
244: putchar('\n');
1.15 kristaps 245: return;
1.71 kristaps 246: }
1.15 kristaps 247:
1.91 kristaps 248: if (TERMP_HANG & p->flags) {
249: /* We need one blank after the tag. */
1.129 kristaps 250: p->overstep = /* LINTED */
1.92 kristaps 251: vis - maxvis + 1;
1.91 kristaps 252:
253: /*
254: * Behave exactly the same way as groff:
1.92 kristaps 255: * If we have overstepped the margin, temporarily move
256: * it to the right and flag the rest of the line to be
257: * shorter.
1.91 kristaps 258: * If we landed right at the margin, be happy.
1.92 kristaps 259: * If we are one step before the margin, temporarily
260: * move it one step LEFT and flag the rest of the line
261: * to be longer.
1.91 kristaps 262: */
1.129 kristaps 263: if (p->overstep >= -1) {
264: assert((int)maxvis + p->overstep >= 0);
1.92 kristaps 265: /* LINTED */
1.129 kristaps 266: maxvis += p->overstep;
1.92 kristaps 267: } else
1.129 kristaps 268: p->overstep = 0;
1.91 kristaps 269:
270: } else if (TERMP_DANGLE & p->flags)
271: return;
1.15 kristaps 272:
1.92 kristaps 273: /* Right-pad. */
274: if (maxvis > vis + /* LINTED */
275: ((TERMP_TWOSPACE & p->flags) ? 1 : 0))
1.91 kristaps 276: for ( ; vis < maxvis; vis++)
277: putchar(' ');
1.92 kristaps 278: else { /* ...or newline break. */
1.71 kristaps 279: putchar('\n');
1.91 kristaps 280: for (i = 0; i < (int)p->rmargin; i++)
281: putchar(' ');
282: }
1.15 kristaps 283: }
284:
285:
1.71 kristaps 286: /*
287: * A newline only breaks an existing line; it won't assert vertical
288: * space. All data in the output buffer is flushed prior to the newline
289: * assertion.
290: */
291: void
292: term_newln(struct termp *p)
1.15 kristaps 293: {
294:
1.71 kristaps 295: p->flags |= TERMP_NOSPACE;
296: if (0 == p->col) {
297: p->flags &= ~TERMP_NOLPAD;
1.15 kristaps 298: return;
1.16 kristaps 299: }
1.71 kristaps 300: term_flushln(p);
301: p->flags &= ~TERMP_NOLPAD;
1.16 kristaps 302: }
303:
304:
1.71 kristaps 305: /*
306: * Asserts a vertical space (a full, empty line-break between lines).
307: * Note that if used twice, this will cause two blank spaces and so on.
308: * All data in the output buffer is flushed prior to the newline
309: * assertion.
310: */
311: void
312: term_vspace(struct termp *p)
1.16 kristaps 313: {
314:
1.62 kristaps 315: term_newln(p);
1.71 kristaps 316: putchar('\n');
1.16 kristaps 317: }
318:
319:
1.71 kristaps 320: static void
1.125 kristaps 321: spec(struct termp *p, const char *word, size_t len)
1.17 kristaps 322: {
1.71 kristaps 323: const char *rhs;
324: size_t sz;
1.17 kristaps 325:
1.101 kristaps 326: rhs = chars_a2ascii(p->symtab, word, len, &sz);
1.125 kristaps 327: if (rhs)
328: encode(p, rhs, sz);
1.94 kristaps 329: }
330:
331:
332: static void
1.125 kristaps 333: res(struct termp *p, const char *word, size_t len)
1.94 kristaps 334: {
335: const char *rhs;
336: size_t sz;
337:
1.101 kristaps 338: rhs = chars_a2res(p->symtab, word, len, &sz);
1.125 kristaps 339: if (rhs)
340: encode(p, rhs, sz);
341: }
342:
343:
344: void
345: term_fontlast(struct termp *p)
346: {
347: enum termfont f;
348:
349: f = p->fontl;
350: p->fontl = p->fontq[p->fonti];
351: p->fontq[p->fonti] = f;
352: }
353:
354:
355: void
356: term_fontrepl(struct termp *p, enum termfont f)
357: {
358:
359: p->fontl = p->fontq[p->fonti];
360: p->fontq[p->fonti] = f;
361: }
362:
363:
364: void
365: term_fontpush(struct termp *p, enum termfont f)
366: {
367:
368: assert(p->fonti + 1 < 10);
369: p->fontl = p->fontq[p->fonti];
370: p->fontq[++p->fonti] = f;
371: }
372:
373:
374: const void *
375: term_fontq(struct termp *p)
376: {
377:
378: return(&p->fontq[p->fonti]);
379: }
380:
381:
382: enum termfont
383: term_fonttop(struct termp *p)
384: {
385:
386: return(p->fontq[p->fonti]);
387: }
388:
389:
390: void
391: term_fontpopq(struct termp *p, const void *key)
392: {
393:
394: while (p->fonti >= 0 && key != &p->fontq[p->fonti])
395: p->fonti--;
396: assert(p->fonti >= 0);
397: }
1.94 kristaps 398:
1.125 kristaps 399:
400: void
401: term_fontpop(struct termp *p)
402: {
403:
404: assert(p->fonti);
405: p->fonti--;
1.17 kristaps 406: }
407:
408:
1.71 kristaps 409: /*
410: * Handle pwords, partial words, which may be either a single word or a
411: * phrase that cannot be broken down (such as a literal string). This
412: * handles word styling.
413: */
1.86 kristaps 414: void
415: term_word(struct termp *p, const char *word)
1.65 kristaps 416: {
1.124 kristaps 417: const char *sv, *seq;
1.125 kristaps 418: int sz;
1.124 kristaps 419: size_t ssz;
420: enum roffdeco deco;
1.71 kristaps 421:
1.100 kristaps 422: sv = word;
423:
1.123 kristaps 424: if (word[0] && '\0' == word[1])
1.100 kristaps 425: switch (word[0]) {
426: case('.'):
427: /* FALLTHROUGH */
428: case(','):
429: /* FALLTHROUGH */
430: case(';'):
431: /* FALLTHROUGH */
432: case(':'):
433: /* FALLTHROUGH */
434: case('?'):
435: /* FALLTHROUGH */
436: case('!'):
437: /* FALLTHROUGH */
438: case(')'):
439: /* FALLTHROUGH */
440: case(']'):
441: if ( ! (TERMP_IGNDELIM & p->flags))
442: p->flags |= TERMP_NOSPACE;
443: break;
444: default:
445: break;
446: }
1.65 kristaps 447:
1.133 ! kristaps 448: if ( ! (TERMP_NOSPACE & p->flags)) {
1.125 kristaps 449: bufferc(p, ' ');
1.133 ! kristaps 450: if (TERMP_SENTENCE & p->flags)
! 451: bufferc(p, ' ');
! 452: }
1.65 kristaps 453:
1.71 kristaps 454: if ( ! (p->flags & TERMP_NONOSPACE))
455: p->flags &= ~TERMP_NOSPACE;
1.133 ! kristaps 456:
! 457: p->flags &= ~TERMP_SENTENCE;
1.65 kristaps 458:
1.125 kristaps 459: /* FIXME: use strcspn. */
1.124 kristaps 460:
461: while (*word) {
462: if ('\\' != *word) {
1.125 kristaps 463: encode(p, word, 1);
1.124 kristaps 464: word++;
465: continue;
466: }
467:
468: seq = ++word;
469: sz = a2roffdeco(&deco, &seq, &ssz);
470:
471: switch (deco) {
472: case (DECO_RESERVED):
1.125 kristaps 473: res(p, seq, ssz);
1.124 kristaps 474: break;
475: case (DECO_SPECIAL):
1.125 kristaps 476: spec(p, seq, ssz);
1.124 kristaps 477: break;
478: case (DECO_BOLD):
1.125 kristaps 479: term_fontrepl(p, TERMFONT_BOLD);
1.124 kristaps 480: break;
481: case (DECO_ITALIC):
1.125 kristaps 482: term_fontrepl(p, TERMFONT_UNDER);
1.124 kristaps 483: break;
484: case (DECO_ROMAN):
1.125 kristaps 485: term_fontrepl(p, TERMFONT_NONE);
1.124 kristaps 486: break;
487: case (DECO_PREVIOUS):
1.125 kristaps 488: term_fontlast(p);
1.124 kristaps 489: break;
490: default:
491: break;
492: }
1.127 kristaps 493:
1.124 kristaps 494: word += sz;
1.127 kristaps 495: if (DECO_NOSPACE == deco && '\0' == *word)
496: p->flags |= TERMP_NOSPACE;
1.124 kristaps 497: }
1.65 kristaps 498:
1.131 kristaps 499: /*
500: * Note that we don't process the pipe: the parser sees it as
501: * punctuation, but we don't in terms of typography.
502: */
1.100 kristaps 503: if (sv[0] && 0 == sv[1])
504: switch (sv[0]) {
505: case('('):
506: /* FALLTHROUGH */
507: case('['):
508: p->flags |= TERMP_NOSPACE;
509: break;
510: default:
511: break;
512: }
1.65 kristaps 513: }
514:
515:
1.71 kristaps 516: static void
1.125 kristaps 517: adjbuf(struct termp *p, size_t sz)
1.51 kristaps 518: {
519:
1.125 kristaps 520: if (0 == p->maxcols)
521: p->maxcols = 1024;
522: while (sz >= p->maxcols)
523: p->maxcols <<= 2;
524:
525: p->buf = realloc(p->buf, p->maxcols);
526: if (NULL == p->buf) {
527: perror(NULL);
528: exit(EXIT_FAILURE);
1.71 kristaps 529: }
1.51 kristaps 530: }
531:
1.79 kristaps 532:
533: static void
1.125 kristaps 534: buffera(struct termp *p, const char *word, size_t sz)
1.79 kristaps 535: {
1.125 kristaps 536:
537: if (p->col + sz >= p->maxcols)
538: adjbuf(p, p->col + sz);
539:
1.126 kristaps 540: memcpy(&p->buf[(int)p->col], word, sz);
1.125 kristaps 541: p->col += sz;
542: }
543:
544:
545: static void
546: bufferc(struct termp *p, char c)
547: {
548:
549: if (p->col + 1 >= p->maxcols)
550: adjbuf(p, p->col + 1);
551:
1.126 kristaps 552: p->buf[(int)p->col++] = c;
1.125 kristaps 553: }
554:
555:
556: static void
557: encode(struct termp *p, const char *word, size_t sz)
558: {
559: enum termfont f;
560: int i;
561:
562: /*
563: * Encode and buffer a string of characters. If the current
564: * font mode is unset, buffer directly, else encode then buffer
565: * character by character.
566: */
567:
568: if (TERMFONT_NONE == (f = term_fonttop(p))) {
569: buffera(p, word, sz);
570: return;
571: }
572:
573: for (i = 0; i < (int)sz; i++) {
574: if ( ! isgraph((u_char)word[i])) {
575: bufferc(p, word[i]);
576: continue;
1.79 kristaps 577: }
1.125 kristaps 578:
579: if (TERMFONT_UNDER == f)
580: bufferc(p, '_');
581: else
582: bufferc(p, word[i]);
583:
584: bufferc(p, 8);
585: bufferc(p, word[i]);
1.79 kristaps 586: }
587: }
1.106 kristaps 588:
589:
1.107 kristaps 590: size_t
591: term_vspan(const struct roffsu *su)
1.106 kristaps 592: {
593: double r;
594:
1.107 kristaps 595: switch (su->unit) {
1.106 kristaps 596: case (SCALE_CM):
1.107 kristaps 597: r = su->scale * 2;
1.106 kristaps 598: break;
599: case (SCALE_IN):
1.107 kristaps 600: r = su->scale * 6;
1.106 kristaps 601: break;
602: case (SCALE_PC):
1.107 kristaps 603: r = su->scale;
1.106 kristaps 604: break;
605: case (SCALE_PT):
1.107 kristaps 606: r = su->scale / 8;
1.106 kristaps 607: break;
608: case (SCALE_MM):
1.107 kristaps 609: r = su->scale / 1000;
1.106 kristaps 610: break;
611: case (SCALE_VS):
1.107 kristaps 612: r = su->scale;
1.106 kristaps 613: break;
614: default:
1.107 kristaps 615: r = su->scale - 1;
1.106 kristaps 616: break;
617: }
618:
619: if (r < 0.0)
620: r = 0.0;
1.107 kristaps 621: return(/* LINTED */(size_t)
1.106 kristaps 622: r);
623: }
624:
625:
1.107 kristaps 626: size_t
627: term_hspan(const struct roffsu *su)
1.106 kristaps 628: {
629: double r;
630:
1.108 kristaps 631: /* XXX: CM, IN, and PT are approximations. */
632:
1.107 kristaps 633: switch (su->unit) {
1.106 kristaps 634: case (SCALE_CM):
1.108 kristaps 635: r = 4 * su->scale;
1.106 kristaps 636: break;
637: case (SCALE_IN):
1.108 kristaps 638: /* XXX: this is an approximation. */
639: r = 10 * su->scale;
1.106 kristaps 640: break;
641: case (SCALE_PC):
1.108 kristaps 642: r = (10 * su->scale) / 6;
1.106 kristaps 643: break;
644: case (SCALE_PT):
1.108 kristaps 645: r = (10 * su->scale) / 72;
1.106 kristaps 646: break;
647: case (SCALE_MM):
1.107 kristaps 648: r = su->scale / 1000; /* FIXME: double-check. */
1.106 kristaps 649: break;
650: case (SCALE_VS):
1.107 kristaps 651: r = su->scale * 2 - 1; /* FIXME: double-check. */
1.106 kristaps 652: break;
653: default:
1.107 kristaps 654: r = su->scale;
1.106 kristaps 655: break;
656: }
657:
658: if (r < 0.0)
659: r = 0.0;
1.107 kristaps 660: return((size_t)/* LINTED */
1.106 kristaps 661: r);
662: }
663:
664:
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