storage feature

[calc.git] / parser.h

#ifndef __PARSER_H__
#define __PARSER_H__

/* global variables */

extern double answer;

/* function type */

typedef enum {
    Val = 0, Sig,
    Add, Sub,
    Mul, Div, Mod,
    Pow, Sqr,
    Cos, Sin, Atan,
    Log, Exp,
    Store, Recall, Disp,
    Quit, Help,
    Ans, E, Pi
} func_t;

/* keyword type */

typedef struct _keyword_t {
    char *keyword;
    func_t func;
    int nbops;
    int offset;
    int prio;
} keyword_t;

/* calculus element type */

#define MAX_OPERANDS 10
typedef struct _element_t {
    func_t func;
    int nbops;
    struct _element_t *ops[MAX_OPERANDS];
    double value;
    int prio;
} element_t;

#define ERROR_OP ((element_t *)(-1))

/* parser function */

void delelement (element_t *root);

element_t *parser (char *str, char **next, int prio);

void print_element (element_t *root, int level);

double evaluate_element (element_t *root, char mask);

#endif /* __PARSER_H__ */

/* vim: set ts=4 sw=4 et: */