[Laszlo-dev] For Review: Change 20090508-bargull-QAO Summary: animator bug due to implicit coercion

[André Bargull]

Change 20090508-bargull-QAO by bargull at dell--p4--2-53 on 2009-05-08 20:09:33
in /home/Admin/src/svn/openlaszlo/trunk
for http://svn.openlaszlo.org/openlaszlo/trunk

Summary: animator bug due to implicit coercion

New Features:

Bugs Fixed: LPP-8172 ('empty' animators do not run in swf9)

Technical Reviewer: ptw
QA Reviewer: (pending)
Doc Reviewer: (pending)

Documentation:

Release Notes:

Details:
Empty animators caused a subtle bug in swf9 because of implicit coercion 
in swf9:
In swf9, 'undefined' can only be used for the any-type ('*'), for any 
other type 'undefined' is coerced to 'null'. This is a problem if you 
intend to use strict typing, but then forget some casts. In this case, 
the "attribute"-property was casted to String in some methods, but in 
several methods it wasn't. And if you later use string concatenation 
(here: "e_" + attribute), you may get "e_null" (coerced) or 
"e_undefined" (not coerced).



Tests:
testcase from bugreport

Files:
M WEB-INF/lps/lfc/controllers/LaszloAnimation.lzs

Changeset: 
http://svn.openlaszlo.org/openlaszlo/patches/20090508-bargull-QAO.tar