New WIP custom map selection

core/src/io/anuke/mindustry/maps/Map.java

@@ -5,6 +5,8 @@ import io.anuke.arc.collection.StringMap;
 import io.anuke.arc.files.FileHandle;
 import io.anuke.arc.graphics.Texture;
 import io.anuke.mindustry.Vars;
+import io.anuke.mindustry.game.Rules;
+import io.anuke.mindustry.io.JsonIO;
 
 public class Map implements Comparable<Map>{
     /** Whether this is a custom map. */
@@ -53,6 +55,22 @@ public class Map implements Comparable<Map>{
         Vars.data.modified();
     }
 
+    public Rules rules(){
+        return JsonIO.read(Rules.class, tags.get("rules", "{}"));
+    }
+
+    /** Whether this map has a core of the enemy 'wave' team. Default: true.
+     * Used for checking Attack mode validity.*/
+    public boolean hasEnemyCore(){
+        return tags.get("enemycore", "true").equals("true");
+    }
+
+    /** Whether this map has a core of any team except the default player team. Default: true.
+     * Used for checking PvP mode validity.*/
+    public boolean hasOtherCores(){
+        return tags.get("othercore", "true").equals("true");
+    }
+
     public String author(){
         return tag("author");
     }