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File: [cvsweb.bsd.lv] / mandoc / roff_term.c (download)

Revision 1.13, Wed Jun 14 22:51:25 2017 UTC (4 years, 4 months ago) by schwarze
Branch: MAIN
Changes since 1.12: +25 -1 lines

Naive implementation of the roff(7) .po (page offset) request.

This clearly works when .po is called on the top level, but might
not be sophisticated enough if people call .po inside indentation-changing
contexts, but i haven't seen that in manual pages (yet :).

/*	$Id: roff_term.c,v 1.13 2017/06/14 22:51:25 schwarze Exp $ */
/*
 * Copyright (c) 2010, 2014, 2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <sys/types.h>

#include <assert.h>
#include <stddef.h>

#include "roff.h"
#include "out.h"
#include "term.h"

#define	ROFF_TERM_ARGS struct termp *p, const struct roff_node *n

typedef	void	(*roff_term_pre_fp)(ROFF_TERM_ARGS);

static	void	  roff_term_pre_br(ROFF_TERM_ARGS);
static	void	  roff_term_pre_ce(ROFF_TERM_ARGS);
static	void	  roff_term_pre_ft(ROFF_TERM_ARGS);
static	void	  roff_term_pre_ll(ROFF_TERM_ARGS);
static	void	  roff_term_pre_mc(ROFF_TERM_ARGS);
static	void	  roff_term_pre_po(ROFF_TERM_ARGS);
static	void	  roff_term_pre_sp(ROFF_TERM_ARGS);
static	void	  roff_term_pre_ta(ROFF_TERM_ARGS);
static	void	  roff_term_pre_ti(ROFF_TERM_ARGS);

static	const roff_term_pre_fp roff_term_pre_acts[ROFF_MAX] = {
	roff_term_pre_br,  /* br */
	roff_term_pre_ce,  /* ce */
	roff_term_pre_ft,  /* ft */
	roff_term_pre_ll,  /* ll */
	roff_term_pre_mc,  /* mc */
	roff_term_pre_po,  /* po */
	roff_term_pre_ce,  /* rj */
	roff_term_pre_sp,  /* sp */
	roff_term_pre_ta,  /* ta */
	roff_term_pre_ti,  /* ti */
};


void
roff_term_pre(struct termp *p, const struct roff_node *n)
{
	assert(n->tok < ROFF_MAX);
	(*roff_term_pre_acts[n->tok])(p, n);
}

static void
roff_term_pre_br(ROFF_TERM_ARGS)
{
	term_newln(p);
	if (p->flags & TERMP_BRIND) {
		p->tcol->offset = p->tcol->rmargin;
		p->tcol->rmargin = p->maxrmargin;
		p->flags &= ~(TERMP_NOBREAK | TERMP_BRIND);
	}
}

static void
roff_term_pre_ce(ROFF_TERM_ARGS)
{
	const struct roff_node	*nc1, *nc2;
	size_t			 len, lm;

	roff_term_pre_br(p, n);
	lm = p->tcol->offset;
	nc1 = n->child->next;
	while (nc1 != NULL) {
		nc2 = nc1;
		len = 0;
		do {
			if (nc2->type == ROFFT_TEXT) {
				if (len)
					len++;
				len += term_strlen(p, nc2->string);
			}
			nc2 = nc2->next;
		} while (nc2 != NULL && (nc2->type != ROFFT_TEXT ||
		    (nc2->flags & NODE_LINE) == 0));
		p->tcol->offset = len >= p->tcol->rmargin ? 0 :
		    lm + len >= p->tcol->rmargin ? p->tcol->rmargin - len :
		    n->tok == ROFF_rj ? p->tcol->rmargin - len :
		    (lm + p->tcol->rmargin - len) / 2;
		while (nc1 != nc2) {
			if (nc1->type == ROFFT_TEXT)
				term_word(p, nc1->string);
			else
				roff_term_pre(p, nc1);
			nc1 = nc1->next;
		}
		p->flags |= TERMP_NOSPACE;
		term_flushln(p);
	}
	p->tcol->offset = lm;
}

static void
roff_term_pre_ft(ROFF_TERM_ARGS)
{
	switch (*n->child->string) {
	case '4':
	case '3':
	case 'B':
		term_fontrepl(p, TERMFONT_BOLD);
		break;
	case '2':
	case 'I':
		term_fontrepl(p, TERMFONT_UNDER);
		break;
	case 'P':
		term_fontlast(p);
		break;
	case '1':
	case 'C':
	case 'R':
		term_fontrepl(p, TERMFONT_NONE);
		break;
	default:
		break;
	}
}

static void
roff_term_pre_ll(ROFF_TERM_ARGS)
{
	term_setwidth(p, n->child != NULL ? n->child->string : NULL);
}

static void
roff_term_pre_mc(ROFF_TERM_ARGS)
{
	if (p->col) {
		p->flags |= TERMP_NOBREAK;
		term_flushln(p);
		p->flags &= ~(TERMP_NOBREAK | TERMP_NOSPACE);
	}
	if (n->child != NULL) {
		p->mc = n->child->string;
		p->flags |= TERMP_NEWMC;
	} else
		p->flags |= TERMP_ENDMC;
}

static void
roff_term_pre_po(ROFF_TERM_ARGS)
{
	struct roffsu	 su;
	static int	 po, polast;
	int		 ponew;

	if (n->child != NULL &&
	    a2roffsu(n->child->string, &su, SCALE_EM) != NULL) {
		ponew = term_hen(p, &su);
		if (*n->child->string == '+' ||
		    *n->child->string == '-')
			ponew += po;
	} else
		ponew = polast;
	polast = po;
	po = ponew;

	ponew = po - polast + (int)p->tcol->offset;
	p->tcol->offset = ponew > 0 ? ponew : 0;
}

static void
roff_term_pre_sp(ROFF_TERM_ARGS)
{
	struct roffsu	 su;
	int		 len;

	if (n->child != NULL) {
		if (a2roffsu(n->child->string, &su, SCALE_VS) == NULL)
			su.scale = 1.0;
		len = term_vspan(p, &su);
	} else
		len = 1;

	if (len < 0)
		p->skipvsp -= len;
	else
		while (len--)
			term_vspace(p);

	roff_term_pre_br(p, n);
}

static void
roff_term_pre_ta(ROFF_TERM_ARGS)
{
	term_tab_set(p, NULL);
	for (n = n->child; n != NULL; n = n->next)
		term_tab_set(p, n->string);
}

static void
roff_term_pre_ti(ROFF_TERM_ARGS)
{
	struct roffsu	 su;
	const char	*cp;
	int		 len, sign;

	roff_term_pre_br(p, n);

	if (n->child == NULL)
		return;
	cp = n->child->string;
	if (*cp == '+') {
		sign = 1;
		cp++;
	} else if (*cp == '-') {
		sign = -1;
		cp++;
	} else
		sign = 0;

	if (a2roffsu(cp, &su, SCALE_EM) == NULL)
		return;
	len = term_hen(p, &su);

	if (sign == 0) {
		p->ti = len - p->tcol->offset;
		p->tcol->offset = len;
	} else if (sign == 1) {
		p->ti = len;
		p->tcol->offset += len;
	} else if ((size_t)len < p->tcol->offset) {
		p->ti = -len;
		p->tcol->offset -= len;
	} else {
		p->ti = -p->tcol->offset;
		p->tcol->offset = 0;
	}
}