-#define SUNKNOWN 0
-#define STOKEN 1 /* terminal symbol */
-#define SNTERM 2 /* non-terminal */
-
-#define SALIAS -9991 /* for symbol generated with an alias */
-
-typedef
- struct bucket
- {
- struct bucket *link;
- struct bucket *next;
- char *tag;
- char *type_name;
- short value;
- short prec;
- short assoc;
- short user_token_number;
- /* special value SALIAS in the identifier
- half of the identifier-symbol pair for an alias */
- struct bucket *alias;
- /* points to the other in the identifier-symbol
- pair for an alias */
- char class;
- }
- bucket;
+typedef enum
+{
+ unknown_sym,
+ token_sym, /* terminal symbol */
+ nterm_sym /* non-terminal */
+} symbol_class;
+
+#define SALIAS -9991 /* for symbol generated with an alias */
+
+typedef struct bucket
+{
+ /* Needed for the hash table. */
+ struct bucket *link;
+ struct bucket *next;
+
+ /* The key, name of the symbol. */
+ char *tag;
+ /* Its type. */
+ char *type_name;
+ short value;
+ short prec;
+ associativity assoc;
+ short user_token_number;
+ /* Points to the other in the identifier-symbol pair for an
+ alias. Special value SALIAS in the identifier half of the
+ identifier-symbol pair for an alias. */
+ struct bucket *alias;
+ symbol_class class;
+}
+bucket;