Propagate more token_number_t.

[bison.git] / src / gram.h

diff --git a/src/gram.h b/src/gram.h
index d7b9df4e5da9e7fc8adf69484023f5b0ccedb905..cf21e48f9fb25a09db6efe94858b41276aa31db8 100644 (file)
--- a/src/gram.h
+++ b/src/gram.h
@@ -114,7 +114,16 @@ typedef int item_number_t;
 extern item_number_t *ritem;
 extern int nritems;
 
-extern int start_symbol;
+/* There is weird relationship between item_number_t and
+   token_number_t: we store token_number_t in item_number_t, but in
+   the latter we also store, as negative numbers, the rule numbers.
+
+   Therefore, an token_number_t must be a valid item_number_t, and we
+   sometimes have to perform the converse transformation.  */
+#define token_number_as_item_number(Tok) ((item_number_t) (Tok))
+#define item_number_as_token_number(Ite) ((token_number_t) (Ite))
+
+extern token_number_t start_symbol;
 
 
 typedef struct rule_s