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In tbl(7) -T html output,
span cells horizontally and vertically as requested by the layout.
Does not handle spans requested in the data section yet.

To be able to do this, record the number of rows spanned
in the first data cell (struct tbl_dat) of a vertical span.

Missing feature reported by Pali dot Rohar at gmail dot com.

/*	$Id: tbl_data.c,v 1.46 2018/11/25 19:24:20 schwarze Exp $ */
/*
 * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2011, 2015, 2017, 2018 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 <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "mandoc.h"
#include "mandoc_aux.h"
#include "libmandoc.h"
#include "libroff.h"

static	void		 getdata(struct tbl_node *, struct tbl_span *,
				int, const char *, int *);
static	struct tbl_span	*newspan(struct tbl_node *, int,
				struct tbl_row *);


static void
getdata(struct tbl_node *tbl, struct tbl_span *dp,
		int ln, const char *p, int *pos)
{
	struct tbl_dat	*dat, *pdat;
	struct tbl_cell	*cp;
	struct tbl_span	*pdp;
	int		 sv;

	/* Advance to the next layout cell, skipping spanners. */

	cp = dp->last == NULL ? dp->layout->first : dp->last->layout->next;
	while (cp != NULL && cp->pos == TBL_CELL_SPAN)
		cp = cp->next;

	/*
	 * If the current layout row is out of cells, allocate
	 * a new cell if another row of the table has at least
	 * this number of columns, or discard the input if we
	 * are beyond the last column of the table as a whole.
	 */

	if (cp == NULL) {
		if (dp->layout->last->col + 1 < dp->opts->cols) {
			cp = mandoc_calloc(1, sizeof(*cp));
			cp->pos = TBL_CELL_LEFT;
			dp->layout->last->next = cp;
			cp->col = dp->layout->last->col + 1;
			dp->layout->last = cp;
		} else {
			mandoc_msg(MANDOCERR_TBLDATA_EXTRA, tbl->parse,
			    ln, *pos, p + *pos);
			while (p[*pos])
				(*pos)++;
			return;
		}
	}

	dat = mandoc_malloc(sizeof(*dat));
	dat->layout = cp;
	dat->next = NULL;
	dat->string = NULL;
	dat->hspans = 0;
	dat->vspans = 0;
	dat->block = 0;
	dat->pos = TBL_DATA_NONE;

	/*
	 * Increment the number of vertical spans in a data cell above,
	 * if this cell vertically extends one or more cells above.
	 * The iteration must be done over data rows,
	 * not over layout rows, because one layout row
	 * can be reused for more than one data row.
	 */

	if (cp->pos == TBL_CELL_DOWN) {
		pdp = dp;
		while ((pdp = pdp->prev) != NULL) {
			pdat = pdp->first;
			while (pdat != NULL &&
			    pdat->layout->col < dat->layout->col)
				pdat = pdat->next;
			if (pdat == NULL)
				break;
			if (pdat->layout->pos != TBL_CELL_DOWN) {
				pdat->vspans++;
				break;
			}
		}
	}

	/*
	 * Count the number of horizontal spans to the right of this cell.
	 * This is purely a matter of the layout, independent of the data.
	 */

	for (cp = cp->next; cp != NULL; cp = cp->next)
		if (cp->pos == TBL_CELL_SPAN)
			dat->hspans++;
		else
			break;

	/* Append the new data cell to the data row. */

	if (dp->last == NULL)
		dp->first = dat;
	else
		dp->last->next = dat;
	dp->last = dat;

	sv = *pos;
	while (p[*pos] && p[*pos] != tbl->opts.tab)
		(*pos)++;

	/*
	 * Check for a continued-data scope opening.  This consists of a
	 * trailing `T{' at the end of the line.  Subsequent lines,
	 * until a standalone `T}', are included in our cell.
	 */

	if (*pos - sv == 2 && p[sv] == 'T' && p[sv + 1] == '{') {
		tbl->part = TBL_PART_CDATA;
		return;
	}

	dat->string = mandoc_strndup(p + sv, *pos - sv);

	if (p[*pos])
		(*pos)++;

	if ( ! strcmp(dat->string, "_"))
		dat->pos = TBL_DATA_HORIZ;
	else if ( ! strcmp(dat->string, "="))
		dat->pos = TBL_DATA_DHORIZ;
	else if ( ! strcmp(dat->string, "\\_"))
		dat->pos = TBL_DATA_NHORIZ;
	else if ( ! strcmp(dat->string, "\\="))
		dat->pos = TBL_DATA_NDHORIZ;
	else
		dat->pos = TBL_DATA_DATA;

	if ((dat->layout->pos == TBL_CELL_HORIZ ||
	    dat->layout->pos == TBL_CELL_DHORIZ ||
	    dat->layout->pos == TBL_CELL_DOWN) &&
	    dat->pos == TBL_DATA_DATA && *dat->string != '\0')
		mandoc_msg(MANDOCERR_TBLDATA_SPAN,
		    tbl->parse, ln, sv, dat->string);
}

void
tbl_cdata(struct tbl_node *tbl, int ln, const char *p, int pos)
{
	struct tbl_dat	*dat;
	size_t		 sz;

	dat = tbl->last_span->last;

	if (p[pos] == 'T' && p[pos + 1] == '}') {
		pos += 2;
		if (p[pos] == tbl->opts.tab) {
			tbl->part = TBL_PART_DATA;
			pos++;
			while (p[pos] != '\0')
				getdata(tbl, tbl->last_span, ln, p, &pos);
			return;
		} else if (p[pos] == '\0') {
			tbl->part = TBL_PART_DATA;
			return;
		}

		/* Fallthrough: T} is part of a word. */
	}

	dat->pos = TBL_DATA_DATA;
	dat->block = 1;

	if (dat->string != NULL) {
		sz = strlen(p + pos) + strlen(dat->string) + 2;
		dat->string = mandoc_realloc(dat->string, sz);
		(void)strlcat(dat->string, " ", sz);
		(void)strlcat(dat->string, p + pos, sz);
	} else
		dat->string = mandoc_strdup(p + pos);

	if (dat->layout->pos == TBL_CELL_DOWN)
		mandoc_msg(MANDOCERR_TBLDATA_SPAN, tbl->parse,
		    ln, pos, dat->string);
}

static struct tbl_span *
newspan(struct tbl_node *tbl, int line, struct tbl_row *rp)
{
	struct tbl_span	*dp;

	dp = mandoc_calloc(1, sizeof(*dp));
	dp->line = line;
	dp->opts = &tbl->opts;
	dp->layout = rp;
	dp->prev = tbl->last_span;

	if (dp->prev == NULL) {
		tbl->first_span = dp;
		tbl->current_span = NULL;
	} else
		dp->prev->next = dp;
	tbl->last_span = dp;

	return dp;
}

void
tbl_data(struct tbl_node *tbl, int ln, const char *p, int pos)
{
	struct tbl_row	*rp;
	struct tbl_cell	*cp;
	struct tbl_span	*sp;

	rp = (sp = tbl->last_span) == NULL ? tbl->first_row :
	    sp->pos == TBL_SPAN_DATA && sp->layout->next != NULL ?
	    sp->layout->next : sp->layout;

	assert(rp != NULL);

	if ( ! strcmp(p, "_")) {
		sp = newspan(tbl, ln, rp);
		sp->pos = TBL_SPAN_HORIZ;
		return;
	} else if ( ! strcmp(p, "=")) {
		sp = newspan(tbl, ln, rp);
		sp->pos = TBL_SPAN_DHORIZ;
		return;
	}

	/*
	 * If the layout row contains nothing but horizontal lines,
	 * allocate an empty span for it and assign the current span
	 * to the next layout row accepting data.
	 */

	while (rp->next != NULL) {
		if (rp->last->col + 1 < tbl->opts.cols)
			break;
		for (cp = rp->first; cp != NULL; cp = cp->next)
			if (cp->pos != TBL_CELL_HORIZ &&
			    cp->pos != TBL_CELL_DHORIZ)
				break;
		if (cp != NULL)
			break;
		sp = newspan(tbl, ln, rp);
		sp->pos = TBL_SPAN_DATA;
		rp = rp->next;
	}

	/* Process a real data row. */

	sp = newspan(tbl, ln, rp);
	sp->pos = TBL_SPAN_DATA;
	while (p[pos] != '\0')
		getdata(tbl, sp, ln, p, &pos);
}