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#ifndef AST_H
#define AST_H
typedef enum {
NT_SKIP, NT_ASSIGN, NT_SEQ, NT_IF, NT_WHILE,
NT_INT, NT_VAR, NT_AOP, NT_BOP, NT_NOT, NT_ROP
} NodeType;
typedef enum { AOP_ADD, AOP_SUB, AOP_MUL } AOp;
typedef enum { BOP_AND, BOP_OR } BOp;
typedef enum { ROP_EQ, ROP_NE, ROP_LT, ROP_LE, ROP_GT, ROP_GE } ROp;
typedef struct ASTNode {
NodeType type;
union {
int val;
char *var;
struct { struct ASTNode *var, *aexp; } assign;
struct { struct ASTNode *exp1, *exp2; union { AOp aop; BOp bop; ROp rop; } op;} bin;
struct ASTNode *bexp;
struct { struct ASTNode *bexp, *s1, *s2; } cond;
struct { struct ASTNode *s1, *s2; } seq;
} u;
} ASTNode;
ASTNode *ast_skip(void);
ASTNode *ast_assign(ASTNode *var, ASTNode *aexp);
ASTNode *ast_seq(ASTNode *s1, ASTNode *s2);
ASTNode *ast_if(ASTNode *bexp, ASTNode *s1, ASTNode *s2);
ASTNode *ast_while(ASTNode *bexp, ASTNode *s);
ASTNode *ast_int(int val);
ASTNode *ast_var(char *var);
ASTNode *ast_aop(AOp, ASTNode *aexp1, ASTNode *aexp2);
ASTNode *ast_bop(BOp, ASTNode *bexp1, ASTNode *bexp2);
ASTNode *ast_not(ASTNode *bexp);
ASTNode *ast_rop(ROp, ASTNode *aexp1, ASTNode *aexp2);
void exec_stmt(ASTNode *n);
void free_ast(ASTNode *n);
void env_print(void);
#endif
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