lib: Finish implementing grammar, DFA construction

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/lib/cmdtree.h b/lib/cmdtree.h
index cdcf347006..e9a10d7ec5 100644
--- a/lib/cmdtree.h
+++ b/lib/cmdtree.h
@@ -20,13 +20,24 @@ struct graph_node
 {
   enum graph_node_type type;
   vector children;
-  int is_leaf, is_root;
+  int is_root;      // true if first token in command
+  int is_leaf;      // true if last token in command
+
   int (*func)(struct vty *, int, const char *[]);
+
+  /* various data fields for nodes */
+  char* text;       // for words and variables
+  int value;        // for numbers
+  int start, end;   // for ranges
 };
 
 /*
  * Adds a child to a node. If the node already has the exact same
  * child, nothing is done.
+ * @param[in] parent node
+ * @param[in] child node
+ * @return the new child, or the existing child if the parent already has the
+ *         new child
  */
 extern struct graph_node *
 add_node(struct graph_node *, struct graph_node *);