From 59b2b66a7c7b6585ebd30e8c530b9f826bcc70e9 Mon Sep 17 00:00:00 2001
From: Alexander Fedotov <a.fedotov@student.ru.nl>
Date: Sat, 26 Mar 2016 13:08:25 +0100
Subject: [PATCH 1/1] screen shrinking done

---
 modelchecker/main.c    |  1 +
 modelchecker/sokoban.c | 38 +++++++++++++++++++++++++++++++-------
 modelchecker/sokoban.h |  2 +-
 3 files changed, 33 insertions(+), 8 deletions(-)

diff --git a/modelchecker/main.c b/modelchecker/main.c
index 240e3c7..d8d7e23 100644
--- a/modelchecker/main.c
+++ b/modelchecker/main.c
@@ -44,6 +44,7 @@ void solve(FILE *inputstream)
 	sokoban_screen *screen = parse_screen(inputstream);
 	if (screen == NULL) printf("Something went wrong...\n");
 	sokoban_print(screen);
+	sokoban_free(screen);
 	//parse_screen(inputstream);
 	time_end_read = clock();
 
diff --git a/modelchecker/sokoban.c b/modelchecker/sokoban.c
index d5e967f..465c628 100644
--- a/modelchecker/sokoban.c
+++ b/modelchecker/sokoban.c
@@ -50,7 +50,24 @@ void sokoban_print(sokoban_screen *screen)
 	}
 }
 
-void sokoban_clear(sokoban_screen *screen)
+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) {
@@ -61,9 +78,11 @@ void sokoban_clear(sokoban_screen *screen)
 
 sokoban_screen *parse_screen(FILE *stream)
 {
-	int buffer, x, y;
+	int buffer, x, y, agent_x, agent_y;
 	x = 0;
 	y = 0;
+	agent_x = 0;
+	agent_y = 0;
 	sokoban_screen *screen = NULL;
 	while((buffer = fgetc(stream)) != EOF){
 		if (buffer == '\n'){
@@ -73,7 +92,11 @@ sokoban_screen *parse_screen(FILE *stream)
 		else {
 			switch(buffer) {
 			case ' ': screen = add_coord(x, y, FREE, screen); break;
-			case '@': screen = add_coord(x, y, AGENT, 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;
@@ -84,8 +107,9 @@ sokoban_screen *parse_screen(FILE *stream)
 			x++;
 		}
 	}
-	sokoban_screen *test = NULL;
-	test = get_coord(0,0,screen);
-	if(test->tile == TARGAGENT) printf("Yuppi\n");
-	return screen;
+	sokoban_screen *newscreen = NULL;
+	newscreen = sokoban_shrink(agent_x, agent_y, screen, newscreen);
+	//sokoban_print(screen); //unshrinked screen
+	sokoban_free(screen);
+	return newscreen;
 }
diff --git a/modelchecker/sokoban.h b/modelchecker/sokoban.h
index 414daa0..30466e3 100644
--- a/modelchecker/sokoban.h
+++ b/modelchecker/sokoban.h
@@ -21,6 +21,6 @@ sokoban_screen *get_coord(int x, int y, sokoban_screen *screen);
 
 void sokoban_print(sokoban_screen *screen);
 
-void sokoban_clear(sokoban_screen *screen);
+void sokoban_free(sokoban_screen *screen);
 
 #endif
-- 
2.20.1