+/* cj_tree_entry_t is a union of either a metric configuration ("key") or a tree
+ * mapping array indexes / map keys to a descendant cj_tree_entry_t*. */
+typedef struct {
+ enum { KEY, TREE } type;
+ union {
+ c_avl_tree_t *tree;
+ cj_key_t *key;
+ };
+} cj_tree_entry_t;
+
+/* cj_state_t is a stack providing the configuration relevant for the context
+ * that is currently being parsed. If entry->type == KEY, the parser should
+ * expect a metric (a numeric value). If entry->type == TREE, the parser should
+ * expect an array of map to descent into. If entry == NULL, no configuration
+ * exists for this part of the JSON structure. */
+typedef struct {
+ cj_tree_entry_t *entry;
+ bool in_array;
+ int index;
+ char name[DATA_MAX_NAME_LEN];
+} cj_state_t;
+