#ifndef _BASIC_H_
#define _BASIC_H_

#define BASIC_OPTP_ADD 1
#define BASIC_OPTP_SUB 2
#define BASIC_OPTP_MUL 3
#define BASIC_OPTP_DIV 4
#define BASIC_OPTP_MOD 5
#define BASIC_OPTP_EQL 6
#define BASIC_OPTP_ASN 7

#define BASIC_LVAL_EXPR  0
#define BASIC_LVAL_VAR   1
#define BASIC_LVAL_CONST 2
#define BASIC_RVAL_EXPR  3
#define BASIC_RVAL_VAR   4
#define BASIC_RVAL_CONST 5

#define BASIC_FOUND_LVAL 0x0001
#define BASIC_FOUND_RVAL 0x0002

#define BASIC_ERR_SYNTAX_MULTIPLE_LVALUES 1
#define BASIC_ERR_SYNTAX_TOKEN_LENGTH 2
#define BASIC_ERR_SYNTAX_GENERAL 3
#define BASIC_ERR_SYNTAX_MULTIPLE_RVALUES 4
#define BASIC_ERR_INVALID_ARGUMENTS 5
#define BASIC_ERR_INTERNAL_NULLPOINTER 6
#define BASIC_ERR_INTERNAL_MEMORY 7
#define BASIC_ERR_INTERNAL_UNDEFINED_BEHAVIOR 8
#define BASIC_ERR_INTERNAL_UNIMPLEMENTED 9
#define BASIC_ERR_MATH_DBZ 10

#define BASIC_TOKENIZER_TOKENS " +-/%*="
#define BASIC_TOKENIZER_MAX_LENGTH 512
#define BASIC_VARNAME_MAX_LENGTH 16

struct basic_expr {
  char type;
  char lval_type;
  char rval_type;
  char pad;
  void *lval;
  void *rval;
};

#define BASIC_VARFLAG_INIT 1
#define BASIC_VARFLAG_TINT 2
#define BASIC_VARFLAG_TSTR 4

struct basic_variable {
  char *name;
  char flags;
  void *value;
};

#define BASIC_CONST_TRUE 1
#define BASIC_CONST_FALSE 0

extern int basic_errno;

void run_basic(void);

#endif /* _BASIC_H_ */