object: introduce uc_prototype_lookup()

The new uc_prototype_lookup() function allows looking up properties in
the given prototype chain.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

2 files changed, 13 insertions, 0 deletions

diff --git a/object.c b/object.c
index 4e49ac4..c0a5227 100644
--- a/object.c
+++ b/object.c
@@ -316,6 +316,18 @@ uc_prototype_new(uc_prototype *parent)
 	return proto;
 }
 
+json_object *
+uc_prototype_lookup(uc_prototype *proto, const char *key)
+{
+	json_object *val;
+
+	for (; proto; proto = proto->parent)
+		if (json_object_object_get_ex(proto->header.jso, key, &val))
+			return val;
+
+	return NULL;
+}
+
 uc_prototype *
 uc_protoref_new(json_object *value, uc_prototype *proto)
 {
diff --git a/object.h b/object.h
index 069f9ed..7ceb521 100644
--- a/object.h
+++ b/object.h
@@ -119,6 +119,7 @@ uc_cfunction *uc_cfunction_new(const char *name, uc_cfn_ptr cfn);
 uc_regexp *uc_regexp_new(const char *pattern, bool icase, bool newline, bool global, char **err);
 uc_prototype *uc_prototype_new(uc_prototype *parent);
 uc_prototype *uc_protoref_new(json_object *value, uc_prototype *proto);
+json_object *uc_prototype_lookup(uc_prototype *proto, const char *key);
 
 uc_ressource_type *uc_ressource_type_add(const char *name, uc_prototype *proto, void (*freefn)(void *));
 uc_ressource_type *uc_ressource_type_lookup(const char *name);