Added a new region-based mask type and the ability to combine masks.

src/main/java/com/sk89q/worldedit/WorldEdit.java

@@ -403,13 +403,13 @@ public Pattern getBlockPattern(LocalPlayer player, String list)
      * blocks to include when replacing.
      * 
      * @param player
+     * @param session
      * @param maskString
      * @return
-     * @throws UnknownItemException
-     * @throws DisallowedItemException
+     * @throws WorldEditException 
      */
-    public Mask getBlockMask(LocalPlayer player, String maskString)
-            throws UnknownItemException, DisallowedItemException {
+    public Mask getBlockMask(LocalPlayer player, LocalSession session,
+            String maskString) throws WorldEditException {
         Mask mask = null;
         
         for (String component : maskString.split(" ")) {
@@ -418,6 +418,10 @@ public Mask getBlockMask(LocalPlayer player, String maskString)
             if (component.charAt(0) == '#') {
                 if (component.equalsIgnoreCase("#existing")) {
                     current = new ExistingBlockMask();
+                } else if (component.equalsIgnoreCase("#selection")
+                        || component.equalsIgnoreCase("#region")
+                        || component.equalsIgnoreCase("#sel")) {
+                    current = new RegionMask(session.getSelection(player.getWorld()));
                 } else {
                     throw new UnknownItemException(component);
                 }

src/main/java/com/sk89q/worldedit/commands/ToolUtilCommands.java

@@ -77,7 +77,7 @@ public static void tool(CommandContext args, WorldEdit we,
         usage = "[mask]",
         desc = "Set the brush mask",
         min = 0,
-        max = 1
+        max = -1
     )
     @CommandPermissions({"worldedit.brush.options.mask"})
     public static void mask(CommandContext args, WorldEdit we,
@@ -87,7 +87,7 @@ public static void mask(CommandContext args, WorldEdit we,
             session.getBrushTool(player.getItemInHand()).setMask(null);
             player.print("Brush mask disabled.");
         } else {
-            Mask mask = we.getBlockMask(player, args.getJoinedStrings(0));
+            Mask mask = we.getBlockMask(player, session, args.getJoinedStrings(0));
             session.getBrushTool(player.getItemInHand()).setMask(mask);
             player.print("Brush mask set.");
         }

src/main/java/com/sk89q/worldedit/masks/RegionMask.java

@@ -0,0 +1,38 @@
+// $Id$
+/*
+ * WorldEdit
+ * Copyright (C) 2010, 2011 sk89q <http://www.sk89q.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package com.sk89q.worldedit.masks;
+
+import com.sk89q.worldedit.EditSession;
+import com.sk89q.worldedit.Vector;
+import com.sk89q.worldedit.regions.Region;
+
+public class RegionMask implements Mask {
+    
+    private Region region;
+    
+    public RegionMask(Region region) {
+        this.region = region;
+    }
+
+    public boolean matches(EditSession editSession, Vector pos) {
+        return region.contains(pos);
+    }
+
+}