ast.h

   1 #ifndef AST_H
   2 #define AST_H
   3
   4 #include <stdio.h>
   5
   6 enum binop {plus,minus,times,divide};
   7 enum ast_type {an_binop, an_cons, an_int};
   8 struct ast {
   9         enum ast_type type;
  10         union {
  11                 struct {
  12                         struct ast *l;
  13                         enum binop op;
  14                         struct ast *r;
  15                 } an_binop;
  16                 struct {
  17                         struct ast *el;
  18                         struct ast *tail;
  19                 } an_cons;
  20                 int an_int;
  21
  22         } data;
  23 };
  24
  25 struct ast *ast_cons(struct ast *el, struct ast *tail);
  26 struct ast *ast_binop(struct ast *l, enum binop op, struct ast *tail);
  27 struct ast *ast_int(int integer);
  28
  29 void ast_print(struct ast * ast, FILE *out);
  30 void ast_free(struct ast *ast);
  31
  32 #endif