[PATCH 1/2 nft] parser: Centralize commentary rule

["Carlos Falgueras García" <carlosfg@riseup.net>]

It make more sense if this rule can not be empty, so it can be used both as
mandatory as optional. The higher rule should choice use it in a way or another.

Signed-off-by: Carlos Falgueras García <carlosfg@riseup.net>
---
 src/parser_bison.y | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/src/parser_bison.y b/src/parser_bison.y
index ef10dee..6f51a49 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -440,7 +440,7 @@ static void location_update(struct location *loc, struct location *rhs, int n)
 %destructor { close_scope(state); table_free($$); }	table_block_alloc
 %type <chain>			chain_block_alloc chain_block
 %destructor { close_scope(state); chain_free($$); }	chain_block_alloc
-%type <rule>			rule
+%type <rule>			rule rule_alloc
 %destructor { rule_free($$); }	rule
 
 %type <val>			set_flag_list	set_flag
@@ -1273,11 +1273,7 @@ ruleid_spec		:	chain_spec	handle_spec	position_spec
 			}
 			;
 
-comment_spec		:	/* empty */
-			{
-				$$ = NULL;
-			}
-			|	COMMENT		string
+comment_spec		:	COMMENT		string
 			{
 				$$ = $2;
 			}
@@ -1295,12 +1291,21 @@ ruleset_spec		:	/* empty */
 			}
 			;
 
-rule			:	stmt_list	comment_spec
+rule			:	rule_alloc
+			{
+				$$->comment = NULL;
+			}
+			|	rule_alloc	comment_spec
+			{
+				$$->comment = $2;
+			}
+			;
+
+rule_alloc		:	stmt_list
 			{
 				struct stmt *i;
 
 				$$ = rule_alloc(&@$, NULL);
-				$$->comment = $2;
 				list_for_each_entry(i, $1, list)
 					$$->num_stmts++;
 				list_splice_tail($1, &$$->stmts);
@@ -2029,9 +2034,9 @@ set_elem_option		:	TIMEOUT			time_spec
 			{
 				$<expr>0->timeout = $2 * 1000;
 			}
-			|	COMMENT			string
+			|	comment_spec
 			{
-				$<expr>0->comment = $2;
+				$<expr>0->comment = $1;
 			}
 			;
 
-- 
2.8.2

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