Make direct calls to _nativeIndexedGetter in "get last" "get first" "get single" instead of calling…

tools/dom/scripts/templateloader.py

 #!/usr/bin/python
 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Template loader and preprocessor.
 #
 # Preprocessor language:
 #
 #   //$ Comment line removed by preprocessor
@@ skipping 64 matching lines @@
       if line.startswith('$'):
         words = line.split()
         directive = words[0]
 
         if directive == '$if':
           if len(words) != 2:
             error(lineno, '$if does not have single variable')
           variable = words[1]
           if variable in conditions:
             condition_stack.append((active, seen_else))
-            active = conditions[variable]
+            active = active and conditions[variable]
             seen_else = False
           else:
             error(lineno, "Unknown $if variable '%s'" % variable)
 
         elif directive == '$else':
           if not condition_stack:
             error(lineno, '$else without $if')
           if seen_else:
             raise error(lineno, 'Double $else')
           seen_else = True
-          active = not active
+          (parentactive, _) = condition_stack[len(condition_stack) - 1]
+          active = not active and parentactive
 
         elif directive == '$endif':
           if not condition_stack:
             error(lineno, '$endif without $if')
           (active, seen_else) = condition_stack.pop()
 
         else:
           # Something else, like '$!MEMBERS'
           if active:
             out.append(full_line)
       elif line.startswith('//$'):
         pass  # Ignore pre-processor comment.
 
       else:
         if active:
           out.append(full_line)
         continue
 
     if condition_stack:
       error(len(lines), 'Unterminated $if')
 
     return ''.join(out)