path: root/src/map/magic-expr.hpp

#ifndef MAGIC_EXPR_HPP
#define MAGIC_EXPR_HPP

#include "magic-interpreter.hpp"

/*
 * 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
 */
struct fun_t
{
    ZString name;
    ZString signature;
    char ret_ty;
    int (*fun)(dumb_ptr<env_t> env, val_t *result, const_array<val_t> arga);
};

struct op_t
{
    ZString name;
    ZString signature;
    int (*op)(dumb_ptr<env_t> env, const_array<val_t> arga);
};

/**
 * Retrieves a function by name
 * @param name The name to look up
 * @return A function of that name, or NULL.
 */
fun_t *magic_get_fun(ZString name);

/**
 * 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(ZString name);

/**
 * Evaluates an expression and stores the result in `dest'
 */
void magic_eval(dumb_ptr<env_t> env, val_t *dest, dumb_ptr<expr_t> expr);

/**
 * Evaluates an expression and coerces the result into an integer
 */
int magic_eval_int(dumb_ptr<env_t> env, dumb_ptr<expr_t> expr);

/**
 * Evaluates an expression and coerces the result into a string
 */
FString magic_eval_str(dumb_ptr<env_t> env, dumb_ptr<expr_t> expr);

dumb_ptr<expr_t> magic_new_expr(EXPR 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, dumb_ptr<area_t> area);

// ret -1: not a string, ret 1: no such item, ret 0: OK
int magic_find_item(const_array<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;                                       \
        default: break;                                         \
    }

int magic_location_in_area(map_local *m, int x, int y, dumb_ptr<area_t> area);

#endif // MAGIC_EXPR_HPP