ast.h

   1 #ifndef AST_H
   2 #define AST_H
   3
   4 #include <stdio.h>
   5
   6 enum binop {
   7         binor,binand,
   8         eq,neq,leq,le,geq,ge,
   9         cons,plus,minus,times,divide,modulo,power
  10 };
  11 enum unop {negate,inverse};
  12 enum ast_type {an_binop, an_cons, an_int, an_unop};
  13 struct ast {
  14         enum ast_type type;
  15         union {
  16                 struct {
  17                         struct ast *l;
  18                         enum binop op;
  19                         struct ast *r;
  20                 } an_binop;
  21                 struct {
  22                         struct ast *el;
  23                         struct ast *tail;
  24                 } an_cons;
  25                 int an_int;
  26                 struct {
  27                         enum unop op;
  28                         struct ast *l;
  29                 } an_unop;
  30
  31         } data;
  32 };
  33
  34 struct ast *ast_cons(struct ast *el, struct ast *tail);
  35 struct ast *ast_binop(struct ast *l, enum binop op, struct ast *tail);
  36 struct ast *ast_int(int integer);
  37 struct ast *ast_unop(enum unop op, struct ast *l);
  38
  39 void ast_print(struct ast * ast, FILE *out);
  40 void ast_free(struct ast *ast);
  41
  42 #endif