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.

1 files changed, 42 insertions, 5 deletions

diff --git a/tbl_data.c b/tbl_data.c
index 01bc62d2..58637d35 100644
--- a/tbl_data.c
+++ b/tbl_data.c
@@ -1,7 +1,7 @@
 /*	$Id$ */
 /*
  * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2011, 2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
+ * 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
@@ -40,8 +40,9 @@ static void
 getdata(struct tbl_node *tbl, struct tbl_span *dp,
 		int ln, const char *p, int *pos)
 {
-	struct tbl_dat	*dat;
+	struct tbl_dat	*dat, *pdat;
 	struct tbl_cell	*cp;
+	struct tbl_span	*pdp;
 	int		 sv;
 
 	/* Advance to the next layout cell, skipping spanners. */
@@ -73,16 +74,52 @@ getdata(struct tbl_node *tbl, struct tbl_span *dp,
 		}
 	}
 
-	dat = mandoc_calloc(1, sizeof(*dat));
+	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;
-	dat->spans = 0;
+
+	/*
+	 * 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->spans++;
+			dat->hspans++;
 		else
 			break;
 
+	/* Append the new data cell to the data row. */
+
 	if (dp->last == NULL)
 		dp->first = dat;
 	else