#ifndef PEX2_H
#define PEX2_H

typedef enum {
  pex2_white_space_token = 1, pex2_space_token = 3, pex2_comment_token,
  pex2_while_loop_token, pex2_while_head_token,
  pex2_false_while_condition_token, pex2_while_iteration_token,
  pex2_true_while_condition_token = 19, pex2_while_body_token = 21,
  pex2_while_body_text_token = 30, pex2_expression_token = 32,
  pex2_eol_token, pex2_section_token, pex2_while_body_terminator_token
} pex2_token_type;

typedef struct pex2_pcb_struct{
  pex2_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];
  int vs[128];
  int ag_ap;
  const char *error_message;
  char read_flag;
  char exit_flag;
  int bts[128], btsx;
  int lab[10], rx, fx;
  const unsigned char *key_sp;
  int save_index, key_state;
  char ag_msg[82];
  const  int *ag_dtl;
  int ag_dsn;
} pex2_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 pex2_pcb_type pex2_pcb;
void init_pex2(void);
void pex2(void);
#endif