Annotation of mandoc/roff_term.c, Revision 1.23
1.22 schwarze 1: /* $OpenBSD: roff_term.c,v 1.20 2020/09/03 17:37:06 schwarze Exp $ */
1.1 schwarze 2: /*
1.22 schwarze 3: * Copyright (c) 2010,2014,2015,2017-2020 Ingo Schwarze <schwarze@openbsd.org>
1.1 schwarze 4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
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.
16: */
1.20 schwarze 17: #include "config.h"
18:
1.1 schwarze 19: #include <sys/types.h>
20:
21: #include <assert.h>
1.16 schwarze 22: #include <stdio.h>
1.17 schwarze 23: #include <string.h>
1.1 schwarze 24:
1.14 schwarze 25: #include "mandoc.h"
1.1 schwarze 26: #include "roff.h"
27: #include "out.h"
28: #include "term.h"
29:
30: #define ROFF_TERM_ARGS struct termp *p, const struct roff_node *n
31:
32: typedef void (*roff_term_pre_fp)(ROFF_TERM_ARGS);
33:
34: static void roff_term_pre_br(ROFF_TERM_ARGS);
1.8 schwarze 35: static void roff_term_pre_ce(ROFF_TERM_ARGS);
1.2 schwarze 36: static void roff_term_pre_ft(ROFF_TERM_ARGS);
1.3 schwarze 37: static void roff_term_pre_ll(ROFF_TERM_ARGS);
1.7 schwarze 38: static void roff_term_pre_mc(ROFF_TERM_ARGS);
1.13 schwarze 39: static void roff_term_pre_po(ROFF_TERM_ARGS);
1.4 schwarze 40: static void roff_term_pre_sp(ROFF_TERM_ARGS);
1.5 schwarze 41: static void roff_term_pre_ta(ROFF_TERM_ARGS);
1.6 schwarze 42: static void roff_term_pre_ti(ROFF_TERM_ARGS);
1.1 schwarze 43:
44: static const roff_term_pre_fp roff_term_pre_acts[ROFF_MAX] = {
45: roff_term_pre_br, /* br */
1.8 schwarze 46: roff_term_pre_ce, /* ce */
1.18 schwarze 47: roff_term_pre_br, /* fi */
1.2 schwarze 48: roff_term_pre_ft, /* ft */
1.7 schwarze 49: roff_term_pre_ll, /* ll */
50: roff_term_pre_mc, /* mc */
1.18 schwarze 51: roff_term_pre_br, /* nf */
1.13 schwarze 52: roff_term_pre_po, /* po */
1.11 schwarze 53: roff_term_pre_ce, /* rj */
1.5 schwarze 54: roff_term_pre_sp, /* sp */
55: roff_term_pre_ta, /* ta */
1.6 schwarze 56: roff_term_pre_ti, /* ti */
1.1 schwarze 57: };
58:
59:
60: void
61: roff_term_pre(struct termp *p, const struct roff_node *n)
62: {
63: assert(n->tok < ROFF_MAX);
64: (*roff_term_pre_acts[n->tok])(p, n);
65: }
66:
67: static void
68: roff_term_pre_br(ROFF_TERM_ARGS)
69: {
70: term_newln(p);
71: if (p->flags & TERMP_BRIND) {
1.9 schwarze 72: p->tcol->offset = p->tcol->rmargin;
73: p->tcol->rmargin = p->maxrmargin;
1.18 schwarze 74: p->trailspace = 0;
1.1 schwarze 75: p->flags &= ~(TERMP_NOBREAK | TERMP_BRIND);
1.18 schwarze 76: p->flags |= TERMP_NOSPACE;
1.2 schwarze 77: }
1.8 schwarze 78: }
79:
80: static void
81: roff_term_pre_ce(ROFF_TERM_ARGS)
82: {
1.11 schwarze 83: const struct roff_node *nc1, *nc2;
1.8 schwarze 84:
85: roff_term_pre_br(p, n);
1.19 schwarze 86: p->flags |= n->tok == ROFF_ce ? TERMP_CENTER : TERMP_RIGHT;
1.11 schwarze 87: nc1 = n->child->next;
88: while (nc1 != NULL) {
89: nc2 = nc1;
1.8 schwarze 90: do {
1.11 schwarze 91: nc2 = nc2->next;
92: } while (nc2 != NULL && (nc2->type != ROFFT_TEXT ||
93: (nc2->flags & NODE_LINE) == 0));
94: while (nc1 != nc2) {
95: if (nc1->type == ROFFT_TEXT)
96: term_word(p, nc1->string);
1.8 schwarze 97: else
1.11 schwarze 98: roff_term_pre(p, nc1);
99: nc1 = nc1->next;
1.8 schwarze 100: }
101: p->flags |= TERMP_NOSPACE;
102: term_flushln(p);
103: }
1.19 schwarze 104: p->flags &= ~(TERMP_CENTER | TERMP_RIGHT);
1.2 schwarze 105: }
106:
107: static void
108: roff_term_pre_ft(ROFF_TERM_ARGS)
109: {
1.15 schwarze 110: const char *cp;
111:
1.17 schwarze 112: cp = n->child->string;
113: switch (mandoc_font(cp, (int)strlen(cp))) {
114: case ESCAPE_FONTBOLD:
1.23 ! schwarze 115: case ESCAPE_FONTCB:
1.2 schwarze 116: term_fontrepl(p, TERMFONT_BOLD);
117: break;
1.17 schwarze 118: case ESCAPE_FONTITALIC:
1.23 ! schwarze 119: case ESCAPE_FONTCI:
1.2 schwarze 120: term_fontrepl(p, TERMFONT_UNDER);
121: break;
1.17 schwarze 122: case ESCAPE_FONTBI:
123: term_fontrepl(p, TERMFONT_BI);
124: break;
125: case ESCAPE_FONTPREV:
1.2 schwarze 126: term_fontlast(p);
127: break;
1.17 schwarze 128: case ESCAPE_FONTROMAN:
1.23 ! schwarze 129: case ESCAPE_FONTCR:
1.2 schwarze 130: term_fontrepl(p, TERMFONT_NONE);
131: break;
132: default:
133: break;
1.1 schwarze 134: }
1.3 schwarze 135: }
136:
137: static void
138: roff_term_pre_ll(ROFF_TERM_ARGS)
139: {
140: term_setwidth(p, n->child != NULL ? n->child->string : NULL);
1.7 schwarze 141: }
142:
143: static void
144: roff_term_pre_mc(ROFF_TERM_ARGS)
145: {
146: if (p->col) {
147: p->flags |= TERMP_NOBREAK;
148: term_flushln(p);
149: p->flags &= ~(TERMP_NOBREAK | TERMP_NOSPACE);
150: }
151: if (n->child != NULL) {
152: p->mc = n->child->string;
153: p->flags |= TERMP_NEWMC;
154: } else
155: p->flags |= TERMP_ENDMC;
1.13 schwarze 156: }
157:
158: static void
159: roff_term_pre_po(ROFF_TERM_ARGS)
160: {
161: struct roffsu su;
1.22 schwarze 162: static int po, pouse, polast;
1.13 schwarze 163: int ponew;
164:
1.22 schwarze 165: /* Revert the currently active page offset. */
166: p->tcol->offset -= pouse;
167:
168: /* Determine the requested page offset. */
1.13 schwarze 169: if (n->child != NULL &&
170: a2roffsu(n->child->string, &su, SCALE_EM) != NULL) {
171: ponew = term_hen(p, &su);
172: if (*n->child->string == '+' ||
173: *n->child->string == '-')
174: ponew += po;
175: } else
176: ponew = polast;
1.22 schwarze 177:
178: /* Remeber both the previous and the newly requested offset. */
1.13 schwarze 179: polast = po;
180: po = ponew;
181:
1.22 schwarze 182: /* Truncate to the range [-offset, 60], remember, and apply it. */
183: pouse = po >= 60 ? 60 :
184: po < -(int)p->tcol->offset ? -p->tcol->offset : po;
185: p->tcol->offset += pouse;
1.4 schwarze 186: }
187:
188: static void
189: roff_term_pre_sp(ROFF_TERM_ARGS)
190: {
191: struct roffsu su;
192: int len;
193:
194: if (n->child != NULL) {
1.10 schwarze 195: if (a2roffsu(n->child->string, &su, SCALE_VS) == NULL)
1.4 schwarze 196: su.scale = 1.0;
197: len = term_vspan(p, &su);
198: } else
199: len = 1;
200:
201: if (len < 0)
202: p->skipvsp -= len;
203: else
204: while (len--)
205: term_vspace(p);
206:
207: roff_term_pre_br(p, n);
1.5 schwarze 208: }
209:
210: static void
211: roff_term_pre_ta(ROFF_TERM_ARGS)
212: {
213: term_tab_set(p, NULL);
214: for (n = n->child; n != NULL; n = n->next)
215: term_tab_set(p, n->string);
1.6 schwarze 216: }
217:
218: static void
219: roff_term_pre_ti(ROFF_TERM_ARGS)
220: {
221: struct roffsu su;
222: const char *cp;
1.21 schwarze 223: const size_t maxoff = 72;
1.6 schwarze 224: int len, sign;
225:
226: roff_term_pre_br(p, n);
227:
228: if (n->child == NULL)
229: return;
230: cp = n->child->string;
231: if (*cp == '+') {
232: sign = 1;
233: cp++;
234: } else if (*cp == '-') {
235: sign = -1;
236: cp++;
237: } else
238: sign = 0;
239:
1.10 schwarze 240: if (a2roffsu(cp, &su, SCALE_EM) == NULL)
1.6 schwarze 241: return;
1.12 schwarze 242: len = term_hen(p, &su);
1.6 schwarze 243:
1.21 schwarze 244: switch (sign) {
245: case 1:
246: if (p->tcol->offset + len <= maxoff)
247: p->ti = len;
248: else if (p->tcol->offset < maxoff)
249: p->ti = maxoff - p->tcol->offset;
250: else
251: p->ti = 0;
252: break;
253: case -1:
254: if ((size_t)len < p->tcol->offset)
255: p->ti = -len;
256: else
257: p->ti = -p->tcol->offset;
258: break;
259: default:
260: if ((size_t)len > maxoff)
261: len = maxoff;
1.9 schwarze 262: p->ti = len - p->tcol->offset;
1.21 schwarze 263: break;
1.6 schwarze 264: }
1.21 schwarze 265: p->tcol->offset += p->ti;
1.1 schwarze 266: }
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