71 lines
1.3 KiB
C
71 lines
1.3 KiB
C
#pragma once
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#include <stdint.h>
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#include <assert.h>
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#include <stdlib.h>
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enum node_type {
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N_CONS,
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N_IDENT,
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N_INTEGER
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};
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struct node {
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enum node_type type;
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union {
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struct {
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struct node *car, *cdr;
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} n_cons;
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char *n_ident;
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intmax_t n_integer;
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};
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};
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static inline int cons_q(struct node *n) {
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return !n || n->type == N_CONS;
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}
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static inline int null_q(struct node *n) {
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return n == NULL;
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}
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static inline int pair_q(struct node *n) {
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return n && n->type == N_CONS;
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}
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static inline int ident_q(struct node *n) {
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return n && n->type == N_IDENT;
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}
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static inline int integer_q(struct node *n) {
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return n && n->type == N_INTEGER;
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}
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static inline struct node *car(struct node *n) {
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assert(pair_q(n));
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return n->n_cons.car;
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}
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static inline struct node *cdr(struct node *n) {
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assert(pair_q(n));
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return n->n_cons.cdr;
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}
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static inline struct node *cadr(struct node *n) {
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return car(cdr(n));
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}
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static inline struct node *caddr(struct node *n) {
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return car(cdr(cdr(n)));
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}
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static inline struct node *cddr(struct node *n) {
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return cdr(cdr(n));
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}
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struct node *cons(struct node *a, struct node *b);
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struct node *ident(const char *i);
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struct node *integer(intmax_t v);
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struct node *list(int n, ...);
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void vm_print(const struct node *node, int depth);
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