parser.h

   1 #ifndef __PARSER_H__
   2 #define __PARSER_H__
   3
   4 /* global variables */
   5
   6 extern double answer;
   7
   8 /* function type */
   9
  10 typedef enum {
  11     Val = 0, Sig,
  12     Add, Sub,
  13     Mul, Div, Mod,
  14     Pow, Sqr,
  15     Cos, Sin, Atan,
  16     Log, Exp,
  17     Store, Recall, Disp,
  18     Quit, Help,
  19     Ans, E, Pi
  20 } func_t;
  21
  22 /* keyword type */
  23
  24 typedef struct _keyword_t {
  25     char *keyword;
  26     func_t func;
  27     int nbops;
  28     int offset;
  29     int prio;
  30 } keyword_t;
  31
  32 /* calculus element type */
  33
  34 #define MAX_OPERANDS 10
  35 typedef struct _element_t {
  36     func_t func;
  37     int nbops;
  38     struct _element_t *ops[MAX_OPERANDS];
  39     double value;
  40     int prio;
  41 } element_t;
  42
  43 #define ERROR_OP ((element_t *)(-1))
  44
  45 /* parser function */
  46
  47 void delelement (element_t *root);
  48
  49 element_t *parser (char *str, char **next, int prio);
  50
  51 void print_element (element_t *root, int level);
  52
  53 double evaluate_element (element_t *root, char mask);
  54
  55 #endif /* __PARSER_H__ */
  56
  57 /* vim: set ts=4 sw=4 et: */