mdocml: Completely rewrite the top level of the layout parser.

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
Completely rewrite the top level of the layout parser.
* Do not allocate lines unless there are cells.
* Make the MANDOCERR_TBLNOLAYOUT message actually work.
Also get rid of one static function and two goto statements.

Modified Files:
--------------
    mdocml:
        tbl_layout.c

Revision Data
-------------
Index: tbl_layout.c
===================================================================
RCS file: /home/cvs/mdocml/mdocml/tbl_layout.c,v
retrieving revision 1.29
retrieving revision 1.30
diff -Ltbl_layout.c -Ltbl_layout.c -u -p -r1.29 -r1.30
--- tbl_layout.c
+++ tbl_layout.c
@@ -59,7 +59,6 @@ static	int		 mods(struct tbl_node *, str
 				int, const char *, int *);
 static	int		 cell(struct tbl_node *, struct tbl_row *,
 				int, const char *, int *);
-static	void		 row(struct tbl_node *, int, const char *, int *);
 static	struct tbl_cell *cell_alloc(struct tbl_node *, struct tbl_row *,
 				enum tbl_cellt, int vert);
 
@@ -300,68 +299,54 @@ cell(struct tbl_node *tbl, struct tbl_ro
 	return(mods(tbl, cell_alloc(tbl, rp, c, vert), ln, p, pos));
 }
 
-static void
-row(struct tbl_node *tbl, int ln, const char *p, int *pos)
+int
+tbl_layout(struct tbl_node *tbl, int ln, const char *p)
 {
 	struct tbl_row	*rp;
+	int		 pos;
 
-row:	/*
-	 * EBNF describing this section:
-	 *
-	 * row		::= row_list [:space:]* [.]?[\n]
-	 * row_list	::= [:space:]* row_elem row_tail
-	 * row_tail	::= [:space:]*[,] row_list |
-	 *                  epsilon
-	 * row_elem	::= [\t\ ]*[:alpha:]+
-	 */
-
-	rp = mandoc_calloc(1, sizeof(struct tbl_row));
-	if (tbl->last_row)
-		tbl->last_row->next = rp;
-	else
-		tbl->first_row = rp;
-	tbl->last_row = rp;
+	pos = 0;
+	rp = NULL;
 
-cell:
-	while (isspace((unsigned char)p[*pos]))
-		(*pos)++;
+	for (;;) {
+		/* Skip whitespace before and after each cell. */
 
-	/* Safely exit layout context. */
+		while (isspace((unsigned char)p[pos]))
+			pos++;
 
-	if ('.' == p[*pos]) {
-		tbl->part = TBL_PART_DATA;
-		if (NULL == tbl->first_row)
+		switch (p[pos]) {
+		case ',':  /* Next row on this input line. */
+			pos++;
+			rp = NULL;
+			continue;
+		case '\0':  /* Next row on next input line. */
+			return(1);
+		case '.':  /* End of layout. */
+			pos++;
+			tbl->part = TBL_PART_DATA;
+			if (tbl->first_row != NULL)
+				return(1);
 			mandoc_msg(MANDOCERR_TBLNOLAYOUT,
-			    tbl->parse, ln, *pos, NULL);
-		(*pos)++;
-		return;
-	}
-
-	/* End (and possibly restart) a row. */
-
-	if (',' == p[*pos]) {
-		(*pos)++;
-		goto row;
-	} else if ('\0' == p[*pos])
-		return;
-
-	if ( ! cell(tbl, rp, ln, p, pos))
-		return;
-
-	goto cell;
-	/* NOTREACHED */
-}
-
-int
-tbl_layout(struct tbl_node *tbl, int ln, const char *p)
-{
-	int		 pos;
-
-	pos = 0;
-	row(tbl, ln, p, &pos);
+			    tbl->parse, ln, pos, NULL);
+			rp = mandoc_calloc(1, sizeof(*rp));
+			cell_alloc(tbl, rp, TBL_CELL_LEFT, 0);
+			tbl->first_row = tbl->last_row = rp;
+			return(1);
+		default:  /* Cell. */
+			break;
+		}
 
-	/* Always succeed. */
-	return(1);
+		if (rp == NULL) {  /* First cell on this line. */
+			rp = mandoc_calloc(1, sizeof(*rp));
+			if (tbl->last_row)
+				tbl->last_row->next = rp;
+			else
+				tbl->first_row = rp;
+			tbl->last_row = rp;
+		}
+		if ( ! cell(tbl, rp, ln, p, &pos))
+			return(1);
+	}
 }
 
 static struct tbl_cell *
--
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