schema parsers CHANGE reaction to failure of default value resolving

In some cases, the failure in parsing default value can be caused by
possible forward reference (leafref, identityref), so isntead of
immediate error, we should try it later again as an unresolved item.

Author: rkrejci

src/resolve.c

@@ -3067,7 +3067,8 @@ check_default(struct lys_type *type, const char **value, struct lys_module *modu
         }
     } else {
         if (!lyp_parse_value(&((struct lys_node_leaf *)node.schema)->type, &node.value_str, NULL, NULL, &node, 1, 1)) {
-            ret = -1;
+            /* possible forward reference */
+            ret = 1;
             if (base_tpdf) {
                 /* default value is defined in some base typedef */
                 if ((type->base == LY_TYPE_BITS && type->der->type.der) ||
@@ -5055,7 +5056,7 @@ resolve_base_ident(const struct lys_module *module, struct lys_ident *ident, con
  *
  * @param[in] type Identityref type.
  * @param[in] ident_name Identityref name.
- * @param[in] node Node where the identityref is being resolved, if NULL the logging is switched off
+ * @param[in] node Node where the identityref is being resolved
  *
  * @return Pointer to the identity resolvent, NULL on error.
  */
@@ -5075,11 +5076,17 @@ resolve_identref(struct lys_type *type, const char *ident_name, struct lyd_node
     if (rc < 1) {
         if (node) {
             LOGVAL(LYE_INCHAR, LY_VLOG_LYD, node, ident_name[-rc], &ident_name[-rc]);
+        } else {
+            LOGVAL(LYE_SPEC, LY_VLOG_NONE, NULL, "Invalid identityref value \"%s\".", ident_name);
+            ly_vecode = LYVE_INCHAR;
         }
         return NULL;
     } else if (rc < (signed)strlen(ident_name)) {
         if (node) {
             LOGVAL(LYE_INCHAR, LY_VLOG_LYD, node, ident_name[rc], &ident_name[rc]);
+        } else {
+            LOGVAL(LYE_SPEC, LY_VLOG_NONE, NULL, "Invalid identityref value \"%s\".", ident_name);
+            ly_vecode = LYVE_INCHAR;
         }
         return NULL;
     }
@@ -5111,6 +5118,9 @@ resolve_identref(struct lys_type *type, const char *ident_name, struct lyd_node
 
     if (node) {
         LOGVAL(LYE_INRESOLV, LY_VLOG_LYD, node, "identityref", ident_name);
+    } else {
+        LOGVAL(LYE_SPEC, LY_VLOG_NONE, NULL, "Invalid identityref value \"%s\".", ident_name);
+        ly_vecode = LYVE_INRESOLV;
     }
     return NULL;
 
@@ -5121,6 +5131,10 @@ resolve_identref(struct lys_type *type, const char *ident_name, struct lyd_node
                 LOGVAL(LYE_INVAL, LY_VLOG_LYD, node, cur->name, node->schema->name);
                 LOGVAL(LYE_SPEC, LY_VLOG_LYD, node, "Identity \"%s\" is disabled by its if-feature condition.",
                        cur->name);
+            } else {
+                LOGVAL(LYE_SPEC, LY_VLOG_NONE, NULL, "Identity \"%s\" is disabled by its if-feature condition.",
+                       cur->name);
+                ly_vecode = LYVE_INVAL;
             }
             return NULL;
         }