RE: [Flashcoders] Extending the XML class
I tried a different approach. I had performance problems with building a new XML object tree with objects subclassed from XMLNode (I didn't want to re-parse every node). I ended up writing a 'Wrapper' class (apologies if I have the pattern mis-named) that uses __resolve() to route calls from one class to another, simluating inheritance. The constructor takes a reference to the object to be wrapped. I made my variant of XMLNode a subclass of that class. When I run through an XML document, I create my flavor of nodes, each of which keeps a reference to its original XMLNode. It works pretty well for me. In my case, I keep character offsets of the beginnings of all the text nodes, so I can find my way around XHTML docs and insert 'virtual tokens'.' I use these for editing the markup, or for finding character screen locations using getTextExtent() -- at least for the time being--:). It is probably a risky thing to work with __resolve(), I know, but this way, I only use it in one place, so if the implementation changes, I only need to make one edit. Hope this helps. Bill G Message: 8 Date: Thu, 5 Jan 2006 01:43:50 -0500 From: Frederic v. Bochmann [EMAIL PROTECTED] Subject: RE: [Flashcoders] Extending the XML class To: 'Flashcoders mailing list' flashcoders@chattyfig.figleaf.com Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=us-ascii Hey Rifled, Maybe I'm biting off more than I can chew for my first AS2 project... I think your chewing a bit, but that alright, that's what brains are made for :) Why not simply parse your loaded XML structure and recreate the organization with your EXML objects? For an answer to your question: can you override the XMLNode creation for your own implementation, I think the answer is Yes and No! at least for Flash Player 8.0 and lower. You can always use the xmlObject.onData method to override the actual moment when the XML String gets parsed, and eventually implement your own parser code that checks the player version to call different ASNative calls according to the version (very hard to maintain (example: XMLNitro)). Or you could parse the XML string by hand, but that's too hard on your CPU if you're using player versions under 8.5. Basically the answer is no. Don't try! :) The reason why, is this: The Flash Player has its own build-in (Native) SAX XML Parser that returns an array of objects representing the nodes parsed. The XML API we commonly use in ActionScript, uses this build-in SAX Parser to get an Array of Objects ordered in the order they are parsed (like a SAX parser works). The XML implementation we normally use takes this array and creates children of type XMLNodes on himself. It's quite easy to implement, but the problem is that the address of the ASNative call might change from version to version of the Flash Player. It's not suggested to use this method. PS: the ASNative call would look a bit like this: (This is old code) this.status = ASnative(300, 0)(str, tags, false); But BEWARE this might not work in all version of the player. Don't try ;) One thing you might want to try is to associate some custom prototyped functions on the XML object to method prototypes in your own class. For example: XML.prototype.yourCustomMethod = EXML.prototype.yourCustomMethod; and this way, you might be able to have some functionalities with your XMLNode objects that your handling. Be aware of the context of the execution of your methods by the way! (This is like backtracking AS2 to AS1, not suggested either) Anyways, I think you should try simply iterating threw the received (parsed) xml to recreate your own structure, or something like that. One thing that might be interesting is if (Adobe) would provide us with a SAXParser which supports our own custom ContentHandler's that could permit us to handle the data as its being parsed by the internal engine. I can see why they haven't implemented this in previous versions, but with upcoming versions, this sure would be nice to have, if possible. (but that's just my two little tiny cents) Good luck :) Fredz./ -- William Garr Sr. Educational Multimedia Developer Center for New Designs in Learning and Scholarship Georgetown University Washington, DC 20057 phone: 202-687-9119 email: [EMAIL PROTECTED] ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Re: [Flashcoders] Extending the XML class
Hi,
I ran into the exact same problem about a year ago... The XML class doesn't
really make it easy to extend... The way I solved it is by overriding all
necessary methods of the XML class with methods in my extended version, so
EXML in your case.
E.g.
function someOverridenMethod():EXML {
// do some other stuff
return new EXML( this.cloneNode(true).toString() );
}
That way all instances of XMLNode are converted to EXML before being
returned.
This could of course also be used for newly added methods in your extended
class...
Hope that helps.
Jan
On 1/4/06, Rifled Cloaca [EMAIL PROTECTED] wrote:
Hi!
I'm new to AS2, and I'm trying to convert some old AS1 code to AS2. This
code uses XML.prototype to add functionality to the XML class (which is
based on the XMLNode class, but you knew that already). I'm creating a
new
class like this:
dynamic class core.EXML extends XML {
}
This new XML class has new properties in each of its nodes, so I add:
dynamic class core.EXML extends XML {
public var _MC:MovieClip;
public var _parentMC:MovieClip;
}
But, unfortunately, since the EXML class inherits from the XML class, the
nodes are of XMLNode class, not EXML class, so the nodes do not inherit
the
properties and methods I create in the new EXML class.
So, my question is, how do I create a class that creates instances of
itself, or say, an EXMLNode class that inherits from XMLNode?
Any help is greatly appreciated. Thanks!
-rc
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Re: [Flashcoders] Extending the XML class
Jan,
Thanks, but I'm not having any luck. I'm trying to force my EXML class to
create all of it's nodes of class EXMLNode instead of XMLNode. That way, my
custom methods are accessible at any node in the tree. Unfortunately, it
seems that all of the nodes of the tree are type XMLnode, not EXMLNode.
What I can't figure out is what methods are used in the intrinsic XML class
to create nodes in the first place, and how to rewire them to create nodes
of class EXMLNode instead of XMLNode.
Maybe I'm biting off more than I can chew for my first AS2 project... I
don't know.
Any ideas are much appreciated.
Thanks!
-rc
On 1/4/06, Jan Schluenzen [EMAIL PROTECTED] wrote:
Hi,
I ran into the exact same problem about a year ago... The XML class
doesn't
really make it easy to extend... The way I solved it is by overriding all
necessary methods of the XML class with methods in my extended version, so
EXML in your case.
E.g.
function someOverridenMethod():EXML {
// do some other stuff
return new EXML( this.cloneNode(true).toString() );
}
That way all instances of XMLNode are converted to EXML before being
returned.
This could of course also be used for newly added methods in your extended
class...
Hope that helps.
Jan
On 1/4/06, Rifled Cloaca [EMAIL PROTECTED] wrote:
Hi!
I'm new to AS2, and I'm trying to convert some old AS1 code to
AS2. This
code uses XML.prototype to add functionality to the XML class (which is
based on the XMLNode class, but you knew that already). I'm creating a
new
class like this:
dynamic class core.EXML extends XML {
}
This new XML class has new properties in each of its nodes, so I add:
dynamic class core.EXML extends XML {
public var _MC:MovieClip;
public var _parentMC:MovieClip;
}
But, unfortunately, since the EXML class inherits from the XML class,
the
nodes are of XMLNode class, not EXML class, so the nodes do not inherit
the
properties and methods I create in the new EXML class.
So, my question is, how do I create a class that creates instances of
itself, or say, an EXMLNode class that inherits from XMLNode?
Any help is greatly appreciated. Thanks!
-rc
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