mirror of
https://github.com/freebsd/freebsd-src
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267 lines
5.9 KiB
C
267 lines
5.9 KiB
C
/* $OpenBSD: roff_term.c,v 1.20 2020/09/03 17:37:06 schwarze Exp $ */
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/*
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* Copyright (c) 2010,2014,2015,2017-2020 Ingo Schwarze <schwarze@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "config.h"
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#include <sys/types.h>
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include "mandoc.h"
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#include "roff.h"
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#include "out.h"
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#include "term.h"
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#define ROFF_TERM_ARGS struct termp *p, const struct roff_node *n
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typedef void (*roff_term_pre_fp)(ROFF_TERM_ARGS);
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static void roff_term_pre_br(ROFF_TERM_ARGS);
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static void roff_term_pre_ce(ROFF_TERM_ARGS);
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static void roff_term_pre_ft(ROFF_TERM_ARGS);
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static void roff_term_pre_ll(ROFF_TERM_ARGS);
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static void roff_term_pre_mc(ROFF_TERM_ARGS);
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static void roff_term_pre_po(ROFF_TERM_ARGS);
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static void roff_term_pre_sp(ROFF_TERM_ARGS);
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static void roff_term_pre_ta(ROFF_TERM_ARGS);
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static void roff_term_pre_ti(ROFF_TERM_ARGS);
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static const roff_term_pre_fp roff_term_pre_acts[ROFF_MAX] = {
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roff_term_pre_br, /* br */
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roff_term_pre_ce, /* ce */
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roff_term_pre_br, /* fi */
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roff_term_pre_ft, /* ft */
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roff_term_pre_ll, /* ll */
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roff_term_pre_mc, /* mc */
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roff_term_pre_br, /* nf */
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roff_term_pre_po, /* po */
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roff_term_pre_ce, /* rj */
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roff_term_pre_sp, /* sp */
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roff_term_pre_ta, /* ta */
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roff_term_pre_ti, /* ti */
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};
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void
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roff_term_pre(struct termp *p, const struct roff_node *n)
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{
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assert(n->tok < ROFF_MAX);
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(*roff_term_pre_acts[n->tok])(p, n);
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}
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static void
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roff_term_pre_br(ROFF_TERM_ARGS)
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{
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term_newln(p);
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if (p->flags & TERMP_BRIND) {
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p->tcol->offset = p->tcol->rmargin;
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p->tcol->rmargin = p->maxrmargin;
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p->trailspace = 0;
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p->flags &= ~(TERMP_NOBREAK | TERMP_BRIND);
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p->flags |= TERMP_NOSPACE;
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}
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}
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static void
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roff_term_pre_ce(ROFF_TERM_ARGS)
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{
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const struct roff_node *nc1, *nc2;
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roff_term_pre_br(p, n);
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p->flags |= n->tok == ROFF_ce ? TERMP_CENTER : TERMP_RIGHT;
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nc1 = n->child->next;
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while (nc1 != NULL) {
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nc2 = nc1;
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do {
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nc2 = nc2->next;
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} while (nc2 != NULL && (nc2->type != ROFFT_TEXT ||
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(nc2->flags & NODE_LINE) == 0));
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while (nc1 != nc2) {
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if (nc1->type == ROFFT_TEXT)
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term_word(p, nc1->string);
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else
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roff_term_pre(p, nc1);
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nc1 = nc1->next;
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}
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p->flags |= TERMP_NOSPACE;
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term_flushln(p);
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}
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p->flags &= ~(TERMP_CENTER | TERMP_RIGHT);
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}
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static void
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roff_term_pre_ft(ROFF_TERM_ARGS)
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{
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const char *cp;
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cp = n->child->string;
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switch (mandoc_font(cp, (int)strlen(cp))) {
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case ESCAPE_FONTBOLD:
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case ESCAPE_FONTCB:
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term_fontrepl(p, TERMFONT_BOLD);
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break;
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case ESCAPE_FONTITALIC:
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case ESCAPE_FONTCI:
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term_fontrepl(p, TERMFONT_UNDER);
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break;
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case ESCAPE_FONTBI:
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term_fontrepl(p, TERMFONT_BI);
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break;
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case ESCAPE_FONTPREV:
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term_fontlast(p);
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break;
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case ESCAPE_FONTROMAN:
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case ESCAPE_FONTCR:
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term_fontrepl(p, TERMFONT_NONE);
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break;
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default:
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break;
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}
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}
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static void
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roff_term_pre_ll(ROFF_TERM_ARGS)
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{
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term_setwidth(p, n->child != NULL ? n->child->string : NULL);
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}
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static void
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roff_term_pre_mc(ROFF_TERM_ARGS)
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{
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if (p->col) {
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p->flags |= TERMP_NOBREAK;
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term_flushln(p);
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p->flags &= ~(TERMP_NOBREAK | TERMP_NOSPACE);
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}
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if (n->child != NULL) {
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p->mc = n->child->string;
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p->flags |= TERMP_NEWMC;
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} else
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p->flags |= TERMP_ENDMC;
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}
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static void
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roff_term_pre_po(ROFF_TERM_ARGS)
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{
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struct roffsu su;
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static int po, pouse, polast;
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int ponew;
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/* Revert the currently active page offset. */
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p->tcol->offset -= pouse;
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/* Determine the requested page offset. */
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if (n->child != NULL &&
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a2roffsu(n->child->string, &su, SCALE_EM) != NULL) {
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ponew = term_hen(p, &su);
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if (*n->child->string == '+' ||
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*n->child->string == '-')
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ponew += po;
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} else
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ponew = polast;
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/* Remeber both the previous and the newly requested offset. */
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polast = po;
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po = ponew;
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/* Truncate to the range [-offset, 60], remember, and apply it. */
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pouse = po >= 60 ? 60 :
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po < -(int)p->tcol->offset ? -(int)p->tcol->offset : po;
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p->tcol->offset += pouse;
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}
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static void
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roff_term_pre_sp(ROFF_TERM_ARGS)
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{
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struct roffsu su;
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int len;
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if (n->child != NULL) {
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if (a2roffsu(n->child->string, &su, SCALE_VS) == NULL)
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su.scale = 1.0;
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len = term_vspan(p, &su);
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} else
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len = 1;
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if (len < 0)
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p->skipvsp -= len;
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else
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while (len--)
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term_vspace(p);
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roff_term_pre_br(p, n);
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}
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static void
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roff_term_pre_ta(ROFF_TERM_ARGS)
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{
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term_tab_set(p, NULL);
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for (n = n->child; n != NULL; n = n->next)
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term_tab_set(p, n->string);
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}
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static void
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roff_term_pre_ti(ROFF_TERM_ARGS)
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{
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struct roffsu su;
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const char *cp;
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const size_t maxoff = 72;
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int len, sign;
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roff_term_pre_br(p, n);
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if (n->child == NULL)
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return;
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cp = n->child->string;
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if (*cp == '+') {
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sign = 1;
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cp++;
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} else if (*cp == '-') {
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sign = -1;
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cp++;
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} else
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sign = 0;
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if (a2roffsu(cp, &su, SCALE_EM) == NULL)
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return;
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len = term_hen(p, &su);
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switch (sign) {
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case 1:
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if (p->tcol->offset + len <= maxoff)
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p->ti = len;
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else if (p->tcol->offset < maxoff)
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p->ti = maxoff - p->tcol->offset;
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else
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p->ti = 0;
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break;
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case -1:
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if ((size_t)len < p->tcol->offset)
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p->ti = -len;
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else
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p->ti = -p->tcol->offset;
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break;
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default:
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if ((size_t)len > maxoff)
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len = maxoff;
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p->ti = len - p->tcol->offset;
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break;
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}
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p->tcol->offset += p->ti;
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}
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