| Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 1 | /* Parse tree node interface */ |
| 2 | |
| 3 | typedef struct _node { |
| 4 | int n_type; |
| 5 | char *n_str; |
| 6 | int n_nchildren; |
| 7 | struct _node *n_child; |
| 8 | } node; |
| 9 | |
| 10 | extern node *newnode PROTO((int type)); |
| 11 | extern node *addchild PROTO((node *n, int type, char *str)); |
| Guido van Rossum | cc398d1 | 1990-11-18 17:37:25 +0000 | [diff] [blame] | 12 | extern void freenode PROTO((node *n)); |
| Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 13 | |
| 14 | /* Node access functions */ |
| 15 | #define NCH(n) ((n)->n_nchildren) |
| 16 | #define CHILD(n, i) (&(n)->n_child[i]) |
| 17 | #define TYPE(n) ((n)->n_type) |
| 18 | #define STR(n) ((n)->n_str) |
| 19 | |
| 20 | /* Assert that the type of a node is what we expect */ |
| 21 | #ifndef DEBUG |
| 22 | #define REQ(n, type) { /*pass*/ ; } |
| 23 | #else |
| 24 | #define REQ(n, type) \ |
| 25 | { if (TYPE(n) != (type)) { \ |
| 26 | fprintf(stderr, "FATAL: node type %d, required %d\n", \ |
| 27 | TYPE(n), type); \ |
| 28 | abort(); \ |
| 29 | } } |
| 30 | #endif |