context.rb in rio-0.3.8

- old
+ new

@@ -1,8 +1,8 @@
 #--
 # =============================================================================== 
-# Copyright (c) 2005, Christopher Kleckner
+# Copyright (c) 2005, 2006 Christopher Kleckner
 # All rights reserved
 #
 # This file is part of the Rio library for ruby.
 #
 # Rio is free software; you can redistribute it and/or modify
@@ -20,11 +20,11 @@
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 # =============================================================================== 
 #++
 #
 # To create the documentation for Rio run the command
-#  rake rdoc
+#  ruby build_doc.rb
 # from the distribution directory. Then point your browser at the 'doc/rdoc' directory.
 #
 # Suggested Reading
 # * RIO::Doc::SYNOPSIS
 # * RIO::Doc::INTRO
@@ -48,9 +48,24 @@
         @explicit = @explicit.clone
       end
       def delete(key)
         @values.delete(key)
         @explicit.delete(key)
+      end
+      def get_keystate(key)
+        key_exists = @values.key?(key)
+        key_val = @values[key]
+        key_explicit = @explicit[key]
+        [key,key_exists,key_val,key_explicit]
+      end
+      def set_keystate(key,key_exists,key_val,key_explicit)
+        if(key_exists) then
+          @values[key] = key_val
+          @explicit[key] = key_explicit
+        else
+          @values.delete(key)
+          @explicit.delete(key)
+        end
       end
       def set_(key,val)
         @values[key] = val unless @explicit[key]
       end
       def []=(key,val)