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Revision 1.67, Mon Jun 12 22:05:57 2017 UTC (6 years, 9 months ago) by schwarze
Branch: MAIN
Changes since 1.66: +4 -3 lines

If a tbl(7) layout contains a 'w' (minimum width) modifier for a
given column, that column contains no literal or numeric cell of
larger width, and all text block cells in that column can be line
wrapped to fit into that minimum width, groff does not increase
that column width beyond the specified minimum: so do the same.

/*	$Id: out.c,v 1.67 2017/06/12 22:05:57 schwarze Exp $ */
/*
 * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2011, 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 "config.h"

#include <sys/types.h>

#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "mandoc_aux.h"
#include "mandoc.h"
#include "out.h"

static	void	tblcalc_data(struct rofftbl *, struct roffcol *,
			const struct tbl_opts *, const struct tbl_dat *,
			size_t);
static	void	tblcalc_literal(struct rofftbl *, struct roffcol *,
			const struct tbl_dat *, size_t);
static	void	tblcalc_number(struct rofftbl *, struct roffcol *,
			const struct tbl_opts *, const struct tbl_dat *);


/*
 * Parse the *src string and store a scaling unit into *dst.
 * If the string doesn't specify the unit, use the default.
 * If no default is specified, fail.
 * Return a pointer to the byte after the last byte used,
 * or NULL on total failure.
 */
const char *
a2roffsu(const char *src, struct roffsu *dst, enum roffscale def)
{
	char		*endptr;

	dst->unit = def == SCALE_MAX ? SCALE_BU : def;
	dst->scale = strtod(src, &endptr);
	if (endptr == src)
		return NULL;

	switch (*endptr++) {
	case 'c':
		dst->unit = SCALE_CM;
		break;
	case 'i':
		dst->unit = SCALE_IN;
		break;
	case 'f':
		dst->unit = SCALE_FS;
		break;
	case 'M':
		dst->unit = SCALE_MM;
		break;
	case 'm':
		dst->unit = SCALE_EM;
		break;
	case 'n':
		dst->unit = SCALE_EN;
		break;
	case 'P':
		dst->unit = SCALE_PC;
		break;
	case 'p':
		dst->unit = SCALE_PT;
		break;
	case 'u':
		dst->unit = SCALE_BU;
		break;
	case 'v':
		dst->unit = SCALE_VS;
		break;
	case '\0':
		endptr--;
		/* FALLTHROUGH */
	default:
		if (SCALE_MAX == def)
			return NULL;
		dst->unit = def;
		break;
	}
	return endptr;
}

/*
 * Calculate the abstract widths and decimal positions of columns in a
 * table.  This routine allocates the columns structures then runs over
 * all rows and cells in the table.  The function pointers in "tbl" are
 * used for the actual width calculations.
 */
void
tblcalc(struct rofftbl *tbl, const struct tbl_span *sp,
    size_t offset, size_t rmargin)
{
	struct roffsu		 su;
	const struct tbl_opts	*opts;
	const struct tbl_dat	*dp;
	struct roffcol		*col;
	size_t			 ewidth, xwidth;
	int			 spans;
	int			 icol, maxcol, necol, nxcol, quirkcol;

	/*
	 * Allocate the master column specifiers.  These will hold the
	 * widths and decimal positions for all cells in the column.  It
	 * must be freed and nullified by the caller.
	 */

	assert(NULL == tbl->cols);
	tbl->cols = mandoc_calloc((size_t)sp->opts->cols,
	    sizeof(struct roffcol));
	opts = sp->opts;

	for (maxcol = -1; sp; sp = sp->next) {
		if (TBL_SPAN_DATA != sp->pos)
			continue;
		spans = 1;
		/*
		 * Account for the data cells in the layout, matching it
		 * to data cells in the data section.
		 */
		for (dp = sp->first; dp; dp = dp->next) {
			/* Do not used spanned cells in the calculation. */
			if (0 < --spans)
				continue;
			spans = dp->spans;
			if (1 < spans)
				continue;
			icol = dp->layout->col;
			if (maxcol < icol)
				maxcol = icol;
			col = tbl->cols + icol;
			col->flags |= dp->layout->flags;
			if (dp->layout->flags & TBL_CELL_WIGN)
				continue;
			if (dp->layout->wstr != NULL &&
			    dp->layout->width == 0 &&
			    a2roffsu(dp->layout->wstr, &su, SCALE_EN)
			    != NULL)
				dp->layout->width =
				    (*tbl->sulen)(&su, tbl->arg);
			if (col->width < dp->layout->width)
				col->width = dp->layout->width;
			tblcalc_data(tbl, col, opts, dp,
			    dp->block == 0 ? 0 :
			    dp->layout->width ? dp->layout->width :
			    rmargin ? rmargin / (sp->opts->cols + 1) : 0);
		}
	}

	/*
	 * Count columns to equalize and columns to maximize.
	 * Find maximum width of the columns to equalize.
	 * Find total width of the columns *not* to maximize.
	 */

	necol = nxcol = 0;
	ewidth = xwidth = 0;
	for (icol = 0; icol <= maxcol; icol++) {
		col = tbl->cols + icol;
		if (col->flags & TBL_CELL_EQUAL) {
			necol++;
			if (ewidth < col->width)
				ewidth = col->width;
		}
		if (col->flags & TBL_CELL_WMAX)
			nxcol++;
		else
			xwidth += col->width;
	}

	/*
	 * Equalize columns, if requested for any of them.
	 * Update total width of the columns not to maximize.
	 */

	if (necol) {
		for (icol = 0; icol <= maxcol; icol++) {
			col = tbl->cols + icol;
			if ( ! (col->flags & TBL_CELL_EQUAL))
				continue;
			if (col->width == ewidth)
				continue;
			if (nxcol && rmargin)
				xwidth += ewidth - col->width;
			col->width = ewidth;
		}
	}

	/*
	 * If there are any columns to maximize, find the total
	 * available width, deducting 3n margins between columns.
	 * Distribute the available width evenly.
	 */

	if (nxcol && rmargin) {
		xwidth += 3*maxcol +
		    (opts->opts & (TBL_OPT_BOX | TBL_OPT_DBOX) ?
		     2 : !!opts->lvert + !!opts->rvert);
		if (rmargin <= offset + xwidth)
			return;
		xwidth = rmargin - offset - xwidth;

		/*
		 * Emulate a bug in GNU tbl width calculation that
		 * manifests itself for large numbers of x-columns.
		 * Emulating it for 5 x-columns gives identical
		 * behaviour for up to 6 x-columns.
		 */

		if (nxcol == 5) {
			quirkcol = xwidth % nxcol + 2;
			if (quirkcol != 3 && quirkcol != 4)
				quirkcol = -1;
		} else
			quirkcol = -1;

		necol = 0;
		ewidth = 0;
		for (icol = 0; icol <= maxcol; icol++) {
			col = tbl->cols + icol;
			if ( ! (col->flags & TBL_CELL_WMAX))
				continue;
			col->width = (double)xwidth * ++necol / nxcol
			    - ewidth + 0.4995;
			if (necol == quirkcol)
				col->width--;
			ewidth += col->width;
		}
	}
}

static void
tblcalc_data(struct rofftbl *tbl, struct roffcol *col,
    const struct tbl_opts *opts, const struct tbl_dat *dp, size_t mw)
{
	size_t		 sz;

	/* Branch down into data sub-types. */

	switch (dp->layout->pos) {
	case TBL_CELL_HORIZ:
	case TBL_CELL_DHORIZ:
		sz = (*tbl->len)(1, tbl->arg);
		if (col->width < sz)
			col->width = sz;
		break;
	case TBL_CELL_LONG:
	case TBL_CELL_CENTRE:
	case TBL_CELL_LEFT:
	case TBL_CELL_RIGHT:
		tblcalc_literal(tbl, col, dp, mw);
		break;
	case TBL_CELL_NUMBER:
		tblcalc_number(tbl, col, opts, dp);
		break;
	case TBL_CELL_DOWN:
		break;
	default:
		abort();
	}
}

static void
tblcalc_literal(struct rofftbl *tbl, struct roffcol *col,
    const struct tbl_dat *dp, size_t mw)
{
	const char	*str;	/* Beginning of the first line. */
	const char	*beg;	/* Beginning of the current line. */
	char		*end;	/* End of the current line. */
	size_t		 lsz;	/* Length of the current line. */
	size_t		 wsz;	/* Length of the current word. */

	if (dp->string == NULL || *dp->string == '\0')
		return;
	str = mw ? mandoc_strdup(dp->string) : dp->string;
	lsz = 0;
	for (beg = str; beg != NULL && *beg != '\0'; beg = end) {
		end = mw ? strchr(beg, ' ') : NULL;
		if (end != NULL) {
			*end++ = '\0';
			while (*end == ' ')
				end++;
		}
		wsz = (*tbl->slen)(beg, tbl->arg);
		if (mw && lsz && lsz + 1 + wsz <= mw)
			lsz += 1 + wsz;
		else
			lsz = wsz;
		if (col->width < lsz)
			col->width = lsz;
	}
	if (mw)
		free((void *)str);
}

static void
tblcalc_number(struct rofftbl *tbl, struct roffcol *col,
		const struct tbl_opts *opts, const struct tbl_dat *dp)
{
	int		 i;
	size_t		 sz, psz, ssz, d;
	const char	*str;
	char		*cp;
	char		 buf[2];

	/*
	 * First calculate number width and decimal place (last + 1 for
	 * non-decimal numbers).  If the stored decimal is subsequent to
	 * ours, make our size longer by that difference
	 * (right-"shifting"); similarly, if ours is subsequent the
	 * stored, then extend the stored size by the difference.
	 * Finally, re-assign the stored values.
	 */

	str = dp->string ? dp->string : "";
	sz = (*tbl->slen)(str, tbl->arg);

	/* FIXME: TBL_DATA_HORIZ et al.? */

	buf[0] = opts->decimal;
	buf[1] = '\0';

	psz = (*tbl->slen)(buf, tbl->arg);

	if (NULL != (cp = strrchr(str, opts->decimal))) {
		buf[1] = '\0';
		for (ssz = 0, i = 0; cp != &str[i]; i++) {
			buf[0] = str[i];
			ssz += (*tbl->slen)(buf, tbl->arg);
		}
		d = ssz + psz;
	} else
		d = sz + psz;

	/* Adjust the settings for this column. */

	if (col->decimal > d) {
		sz += col->decimal - d;
		d = col->decimal;
	} else
		col->width += d - col->decimal;

	if (sz > col->width)
		col->width = sz;
	if (d > col->decimal)
		col->decimal = d;
}