#ifndef MAGIC_EXPR_H_
#define MAGIC_EXPR_H_
#include "magic-interpreter.h"
#include "magic-interpreter-aux.h"
#ifndef MAX
# define MAX(x,y) (((x)>(y)) ? (x) : (y))
#endif
#ifndef MIN
# define MIN(x,y) (((x)<(y)) ? (x) : (y))
#endif
#ifndef INT_MAX
# define INT_MAX (1<<30) // It's more than that, but this is quite sufficient for our purposes.
#endif
/*
* Argument types:
* i : int
* d : dir
* s : string
* e : entity
* l : location
* a : area
* S : spell
* I : invocation
* . : any, except for fail/undef
* _ : any, including fail, but not undef
*/
typedef struct fun {
char *name;
char *signature;
char ret_ty;
int (*fun)(env_t *env, int args_nr, val_t *result, val_t *args);
} fun_t;
typedef struct op {
char *name;
char *signature;
int (*op)(env_t *env, int args_nr, val_t *args);
} op_t;
/**
* Retrieves a function by name
* @param name The name to look up
* @return A function of that name, or NULL, and a function index
*/
fun_t *
magic_get_fun(char *name, int *index);
/**
* Retrieves an operation by name
* @param name The name to look up
* @return An operation of that name, or NULL, and a function index
*/
op_t *
magic_get_op(char *name, int *index);
/**
* Evaluates an expression and stores the result in `dest'
*/
void
magic_eval(env_t *env, val_t *dest, expr_t *expr);
/**
* Evaluates an expression and coerces the result into an integer
*/
int
magic_eval_int(env_t *env, expr_t *expr);
/**
* Evaluates an expression and coerces the result into a string
*/
char *
magic_eval_str(env_t *env, expr_t *expr);
int
map_is_solid(int m, int x, int y);
expr_t *
magic_new_expr(int ty);
void
magic_clear_var(val_t *v);
void
magic_copy_var(val_t *dest, val_t *src);
void
magic_random_location(location_t *dest, area_t *area);
int // ret -1: not a string, ret 1: no such item, ret 0: OK
magic_find_item(val_t *args, int index, struct item *item, int *stackable);
#define GET_ARG_ITEM(index, dest, stackable) switch(magic_find_item(args, index, &dest, &stackable)) { case -1 : return 1; case 1 : return 0; }
int
magic_location_in_area(int m, int x, int y, area_t *area);
#endif /* !defined(MAGIC_EXPR_H_) */
