1 files changed, 41 insertions, 0 deletions
diff --git a/NET/worlds/scape/UndoStack.java b/NET/worlds/scape/UndoStack.java
new file mode 100644
index 0000000..5c325db
--- /dev/null
+++ b/NET/worlds/scape/UndoStack.java
@@ -0,0 +1,41 @@
+package NET.worlds.scape;
+
+import NET.worlds.console.Console;
+
+class UndoStack {
+   private Undoable[] stack = new Undoable[100];
+   private int stackPtr;
+
+   Undoable peek() {
+      return this.stackPtr - 1 >= 0 ? this.stack[this.stackPtr - 1] : this.stack[this.stack.length - 1];
+   }
+
+   void push(Undoable undo) {
+      while (true) {
+         try {
+            this.stack[this.stackPtr++] = undo;
+            return;
+         } catch (IndexOutOfBoundsException var3) {
+            this.stackPtr = 0;
+         }
+      }
+   }
+
+   boolean undo() {
+      while (true) {
+         try {
+            Undoable u = this.stack[--this.stackPtr];
+            if (u != null) {
+               u.undo();
+               this.stack[this.stackPtr] = null;
+               return true;
+            }
+
+            Console.println(Console.message("No-undo"));
+            return false;
+         } catch (IndexOutOfBoundsException var2) {
+            this.stackPtr = this.stack.length;
+         }
+      }
+   }
+}