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#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 (const 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_) */
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