WIP: Hack in support for let binds

src/state.c

@@ -12,12 +12,12 @@
 
 struct ucl_state {
     struct ucl_object *list;
+    struct ucl_state *parent;
 };
 
 #define NAME_POSITION 0
 #define DATA_POSITION 1
 
-
 static struct ucl_object *ucl_state_get_cell(struct ucl_state *state, const char *name) {
     FOREACH_LIST(state->list, iter, item) {
         assert(item->type == UCL_TYPE_CELL);
@@ -32,7 +32,13 @@ static struct ucl_object *ucl_state_get_cell(struct ucl_state *state, const char
 
 struct ucl_object *ucl_state_get(struct ucl_state *state, const char *name) {
     struct ucl_object *cell = ucl_state_get_cell(state, name);
-    UCL_COND_OR_RET_ERROR(cell != NULL, "Unknown name");
+    if (cell == NULL) {
+        if (state->parent == NULL) {
+            return ucl_error_create(strdup("Unknown error"));
+        } else {
+            return ucl_state_get(state->parent, name);
+        }
+    }
     return ucl_list_nth(cell, DATA_POSITION);
 }
 
@@ -52,6 +58,13 @@ void ucl_state_put(struct ucl_state *state, const char *name, struct ucl_object
 struct ucl_state *ucl_state_create() {
     struct ucl_state *state = malloc(sizeof(struct ucl_state));
     state->list = ucl_nil_create();
+    state->parent = NULL;
+    return state;
+}
+
+struct ucl_state *ucl_state_create_child(struct ucl_state *parent) {
+    struct ucl_state *state = ucl_state_create();
+    state->parent = parent;
     return state;
 }