#include <stdio.h>
#include <stdlib.h>
-
#include "sokoban.h"
-//Still need to remove outside walls and unreachable places.
-struct sokoban_screen *parse_screen(FILE *stream){
- int buffer, x, y;
+sokoban_screen *add_coord(int x, int y, sokoban_tile tile, sokoban_screen *screen)
+{
+ sokoban_screen *r = NULL;
+
+ r = (sokoban_screen *)malloc(sizeof(sokoban_screen));
+ memset(r, 0, sizeof(sokoban_screen));
+ r->coord.x = x;
+ r->coord.y = y;
+ r->tile = tile;
+ HASH_ADD(hh, screen, coord, sizeof(record_key), r);
+ return screen;
+}
+
+sokoban_screen *get_coord(int x, int y, sokoban_screen *screen)
+{
+ sokoban_screen k, *r = NULL;
+ memset(&k, 0, sizeof(sokoban_screen));
+ k.coord.x = x;
+ k.coord.y = y;
+ HASH_FIND(hh, screen, &k.coord, sizeof(record_key), r);
+ return r;
+}
+
+sokoban_screen *delete_coord(int x, int y, sokoban_screen *screen)
+{
+ sokoban_screen *r = NULL;
+ r = get_coord(x, y, screen);
+ if (r) HASH_DEL(screen, r);
+ return screen;
+}
+
+void sokoban_print(sokoban_screen *screen)
+{
+ sokoban_screen *r;
+ for(r=screen; r != NULL; r = (sokoban_screen *)(r->hh.next)){
+ switch(r->tile){
+ case FREE: printf("x = %d y = %d FREE\n", r->coord.x, r->coord.y); break;
+ case WALL: printf("x = %d y = %d WALL\n", r->coord.x, r->coord.y); break;
+ case BOX: printf("x = %d y = %d BOX\n", r->coord.x, r->coord.y); break;
+ case TARGET: printf("x = %d y = %d TARGET\n", r->coord.x, r->coord.y); break;
+ case AGENT: printf("x = %d y = %d AGENT\n", r->coord.x, r->coord.y); break;
+ case TARGAGENT: printf("x = %d y = %d TARGAGENT\n", r->coord.x, r->coord.y); break;
+ case TARGBOX: printf("x = %d y = %d TARGBOX\n", r->coord.x, r->coord.y); break;
+ }
+ }
+}
+
+sokoban_screen *sokoban_shrink(int x, int y, sokoban_screen *screen, sokoban_screen *newscreen)
+{
+ sokoban_screen *c, *nc = NULL;
+ c = get_coord(x, y, screen);
+ if (c) {
+ nc = get_coord(c->coord.x, c->coord.y, newscreen);
+ if (c->tile != WALL && nc == NULL) {
+ newscreen = add_coord(x, y, c->tile, newscreen);
+ newscreen = sokoban_shrink(x-1, y, screen, newscreen);
+ newscreen = sokoban_shrink(x+1, y, screen, newscreen);
+ newscreen = sokoban_shrink(x, y-1, screen, newscreen);
+ newscreen = sokoban_shrink(x, y+1, screen, newscreen);
+ }
+ }
+ return newscreen;
+}
+
+void sokoban_free(sokoban_screen *screen)
+{
+ sokoban_screen *r, *tmp = NULL;
+ HASH_ITER(hh, screen, r, tmp) {
+ HASH_DEL(screen, r);
+ free(r);
+ }
+}
+
+sokoban_screen *parse_screen(FILE *stream)
+{
+ int buffer, x, y, agent_x, agent_y;
x = 0;
y = 0;
- struct sokoban_screen *head, *current;
- head = NULL;
+ agent_x = 0;
+ agent_y = 0;
+ sokoban_screen *screen = NULL;
while((buffer = fgetc(stream)) != EOF){
if (buffer == '\n'){
x = 0;
y++;
}
else {
- current = (struct sokoban_screen *)malloc(sizeof(struct sokoban_screen));
- current->next = head;
switch(buffer) {
- case ' ' : current->tile = FREE; break;
- case '@' : current->tile = AGENT; break;
- case '.' : current->tile = TARGET; break;
- case '#' : current->tile = WALL; break;
- case '$' : current->tile = BOX; break;
- case '*' : current->tile = TARGBOX; break;
- case '+' : current->tile = TARGAGENT; break;
- default: return NULL;
+ case ' ': screen = add_coord(x, y, FREE, screen); break;
+ case '@':
+ screen = add_coord(x, y, AGENT, screen);
+ agent_x = x;
+ agent_y = y;
+ break;
+ case '.': screen = add_coord(x, y, TARGET, screen); break;
+ case '#': screen = add_coord(x, y, WALL, screen); break;
+ case '$': screen = add_coord(x, y, BOX, screen); break;
+ case '*': screen = add_coord(x, y, TARGBOX, screen); break;
+ case '+': screen = add_coord(x, y, TARGAGENT, screen); break;
+ default: return NULL;
}
- current->x = x;
- current->y = y;
x++;
- head = current;
}
}
- return head;
+ sokoban_screen *newscreen = NULL;
+ newscreen = sokoban_shrink(agent_x, agent_y, screen, newscreen);
+ //sokoban_print(screen); //unshrinked screen
+ sokoban_free(screen);
+ return newscreen;
}