expr: add set_elem_expr as container for set element attributes

Add a new expression type "set_elem_expr" that is used as container for
the key in order to attach different attributes, such as timeout values,
to the key.

The expression hierarchy is as follows:

Sets:

    elem
     |
    key

Maps:

   mapping
   /      \
 elem    data
  |
 key

Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 15 insertions, 0 deletions

diff --git a/src/evaluate.c b/src/evaluate.c
index 7ecb7939..37db107b 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -675,6 +675,19 @@ static int expr_evaluate_list(struct eval_ctx *ctx, struct expr **expr)
 	return 0;
 }
 
+static int expr_evaluate_set_elem(struct eval_ctx *ctx, struct expr **expr)
+{
+	struct expr *elem = *expr;
+
+	if (expr_evaluate(ctx, &elem->key) < 0)
+		return -1;
+
+	elem->dtype = elem->key->dtype;
+	elem->len   = elem->key->len;
+	elem->flags = elem->key->flags;
+	return 0;
+}
+
 static int expr_evaluate_set(struct eval_ctx *ctx, struct expr **expr)
 {
 	struct expr *set = *expr, *i, *next;
@@ -1100,6 +1113,8 @@ static int expr_evaluate(struct eval_ctx *ctx, struct expr **expr)
 		return expr_evaluate_list(ctx, expr);
 	case EXPR_SET:
 		return expr_evaluate_set(ctx, expr);
+	case EXPR_SET_ELEM:
+		return expr_evaluate_set_elem(ctx, expr);
 	case EXPR_MAP:
 		return expr_evaluate_map(ctx, expr);
 	case EXPR_MAPPING: