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     Quit, Help,
  18     Ans, E, Pi
  19 } func_t;
  20
  21 /* keyword type */
  22
  23 typedef struct _keyword_t {
  24     char *keyword;
  25     func_t func;
  26     int nbops;
  27     int offset;
  28     int prio;
  29 } keyword_t;
  30
  31 /* calculus element type */
  32
  33 #define MAX_OPERANDS 10
  34 typedef struct _element_t {
  35     func_t func;
  36     int nbops;
  37     struct _element_t *ops[MAX_OPERANDS];
  38     double value;
  39     int prio;
  40 } element_t;
  41
  42 #define ERROR_OP ((element_t *)(-1))
  43
  44 /* parser function */
  45
  46 void delelement (element_t *root);
  47
  48 element_t *parser (char *str, char **next, int prio);
  49
  50 void print_element (element_t *root, int level);
  51
  52 double evaluate_element (element_t *root, char mask);
  53
  54 #endif /* __PARSER_H__ */
  55
  56 /* vim: set ts=4 sw=4 et: */