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#ifndef SOK_H
#define SOK_H
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#include <stdint.h> // uint16_t
#include <stddef.h> // size_t
/*********/
/* types */
/*********/
typedef struct {
uint16_t x, y;
} sok_pos_t;
typedef enum {
SOK_DIR_RIGHT,
SOK_DIR_UP,
SOK_DIR_LEFT,
SOK_DIR_DOWN,
SOK_DIR_LAST,
} sok_dir_t;
typedef struct {
sok_pos_t pos;
sok_dir_t dir;
_Bool is_push;
} sok_move_t;
/****************/
/* level parser */
/****************/
typedef struct sok_level_parser_t_ sok_level_parser_t;
typedef _Bool (*sok_level_parser_pos_cb_t)(
const sok_level_parser_t * const,
const sok_pos_t
);
typedef _Bool (*sok_level_parser_junk_cb_t)(
const sok_level_parser_t * const,
const size_t,
const char
);
typedef struct {
sok_level_parser_pos_cb_t on_size,
on_home,
on_wall,
on_goal,
on_box;
sok_level_parser_junk_cb_t on_junk;
} sok_level_parser_cbs_t;
struct sok_level_parser_t_ {
const sok_level_parser_cbs_t *cbs;
void *user_data;
};
void sok_level_parser_init(
sok_level_parser_t * const parser,
const sok_level_parser_cbs_t * const cbs,
void * const user_data
);
_Bool sok_level_parser_parse(
sok_level_parser_t * const parser,
const char * const buf,
const size_t buf_len
);
/*********/
/* level */
/*********/
#define SOK_LEVEL_MAX_WIDTH (1 << 8)
#define SOK_LEVEL_MAX_HEIGHT (1 << 8)
#define SOK_LEVEL_MAX_BOXES 64
#define SOK_LEVEL_MAX_GOALS 64
typedef struct {
sok_pos_t size;
_Bool walls[SOK_LEVEL_MAX_WIDTH * SOK_LEVEL_MAX_HEIGHT];
// player home position
sok_pos_t home;
// boxes
sok_pos_t boxes[SOK_LEVEL_MAX_BOXES];
size_t num_boxes;
// goals
sok_pos_t goals[SOK_LEVEL_MAX_GOALS];
size_t num_goals;
} sok_level_t;
/***********/
/* context */
/***********/
#define SOK_CTX_MAX_MOVES 1024
typedef struct {
sok_level_t level;
// moves
sok_move_t moves[SOK_CTX_MAX_MOVES];
size_t num_moves;
// number of open goals
size_t num_goals_left;
// player position
sok_pos_t home;
// box positions
sok_pos_t boxes[SOK_LEVEL_MAX_BOXES];
// user data
void *user_data;
} sok_ctx_t;
void sok_ctx_init(sok_ctx_t * const ctx, void *user_data);
_Bool sok_ctx_set_level(sok_ctx_t * const ctx, const char * const level);
_Bool sok_ctx_is_done(sok_ctx_t * const);
_Bool sok_ctx_move(sok_ctx_t * const, const sok_dir_t);
_Bool sok_ctx_undo(sok_ctx_t * const);
/******************/
/* context walker */
/******************/
typedef _Bool (*sok_ctx_walk_pos_cb_t)(
const sok_ctx_t * const,
const sok_pos_t,
void * const
);
typedef _Bool (*sok_ctx_walk_tile_cb_t)(
const sok_ctx_t * const,
const sok_pos_t,
const _Bool,
void * const
);
typedef _Bool (*sok_ctx_walk_goal_cb_t)(
const sok_ctx_t * const,
const sok_pos_t,
const _Bool has_player,
const _Bool has_box,
void * const
);
typedef _Bool (*sok_ctx_walk_move_cb_t)(
const sok_ctx_t * const,
const sok_move_t,
void * const
);
typedef struct {
sok_ctx_walk_pos_cb_t on_size,
on_wall;
sok_ctx_walk_tile_cb_t on_home,
on_box;
sok_ctx_walk_goal_cb_t on_goal;
sok_ctx_walk_move_cb_t on_move;
} sok_ctx_walk_cbs_t;
_Bool sok_ctx_walk(
const sok_ctx_t * const,
const sok_ctx_walk_cbs_t * const,
void * const
);
/****************/
/* context hash */
/****************/
uint64_t sok_ctx_hash(const sok_ctx_t * const);
/*********/
/* cache */
/*********/
#define SOK_CACHE_DEFAULT_CAPACITY 1024
typedef struct {
uint64_t *vals;
size_t num_vals, capacity;
} sok_cache_t;
_Bool sok_cache_init(sok_cache_t * const, const size_t);
void sok_cache_fini(sok_cache_t * const);
_Bool sok_cache_has(const sok_cache_t * const, const sok_ctx_t * const);
_Bool sok_cache_add(sok_cache_t * const, const sok_ctx_t * const);
/*********/
/* solve */
/*********/
_Bool sok_solve(
sok_ctx_t * const,
void (*on_error)(const char * const)
);
#ifdef __cplusplus
};
#endif /* __cplusplus */
#endif /* SOK_H */
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