#ifndef FFCALC_H
#define FFCALC_H

typedef union {
  double alignment;
  char ag_vt_2[sizeof(int)];
  char ag_vt_4[sizeof(double)];
} ffcalc_vs_type;

typedef enum {
  ffcalc_white_space_token = 1, ffcalc_calculator_token = 3,
  ffcalc_calculation_token, ffcalc_eof_token = 10, ffcalc_expression_token,
  ffcalc_name_token, ffcalc_error_token = 14, ffcalc_term_token,
  ffcalc_factor_token = 18, ffcalc_integer_part_token = 30,
  ffcalc_fraction_part_token = 32, ffcalc_digit_token = 34,
  ffcalc_real_token = 44
} ffcalc_token_type;

typedef struct ffcalc_pcb_struct{
  ffcalc_token_type token_number, reduction_token, error_frame_token;
  int input_code;
  int input_value;
  int line, column;
  int ssx, sn, error_frame_ssx;
  int drt, dssx, dsn;
  int ss[128];
  ffcalc_vs_type vs[128];
  int ag_ap;
  const char *error_message;
  char read_flag;
  char exit_flag;
  int bts[128], btsx;
  int lab[3], rx, fx;
  const unsigned char *key_sp;
  int save_index, key_state;
  char ag_msg[82];
} ffcalc_pcb_type;

#ifndef PRULE_CONTEXT
#define PRULE_CONTEXT(pcb)  (&((pcb).cs[(pcb).ssx]))
#define PERROR_CONTEXT(pcb) ((pcb).cs[(pcb).error_frame_ssx])
#define PCONTEXT(pcb)       ((pcb).cs[(pcb).ssx])
#endif

#ifndef AG_RUNNING_CODE
/* PCB.exit_flag values */
#define AG_RUNNING_CODE         0
#define AG_SUCCESS_CODE         1
#define AG_SYNTAX_ERROR_CODE    2
#define AG_REDUCTION_ERROR_CODE 3
#define AG_STACK_ERROR_CODE     4
#define AG_SEMANTIC_ERROR_CODE  5
#endif

extern ffcalc_pcb_type ffcalc_pcb;
void init_ffcalc(void);
void ffcalc(void);
#endif