[Pharo-dev] Strange DNU effect on Windows with Pastell

Jan. 11, 2017

      I have a strange effect I was not able to find out so far. You can try with
any newer Pharo image/VM but here are the exact combination I tried:

1. Load latest VM from https://dl.bintray.com/pharo-project/pharo-vm/
   which is as of today 
   (https://dl.bintray.com/pharo-project/pharo-vm/pharo-win-i386-201701091105-b0...)

   Extract in a directory. 

2. Download and extract http://files.pharo.org/sources/PharoV50.sources.zip into same directory

3. Use latest image http://files.pharo.org/image/60/60342.zip in same directory

4. Start Pharo and load "Pastell"

    Metacello new
	   smalltalkhubUser: 'Pharo' project: 'MetaRepoForPharo50';
	   configuration: 'Pastell';
	   version: #stable;
	   load.

5. Put some Transcript output into: XMLNodeWithElements>>#doesNotUnderstand: by changing it
   to: 

     doesNotUnderstand: aMessage
	   "If I have one or more childs whose name is the same as the selector,
	    return them in a PastellCollection.
	    Otherwise, let the DNU propagate"

	    | v |
	    Transcript show: aMessage selector asString;cr.
	    v := self child: aMessage selector.
	    ^ v
		   ifEmpty: [ super doesNotUnderstand: aMessage ]
		   ifNotEmpty: [ v ].

6.  Now evaluate:

    | xml document htmls html heads |
    Transcript open;clear.
	xml := '<html>
				<head></head>
				<head></head>
		  </html>'.
	document := XMLDOMParser parse: xml readStream.
	htmls := document html. "gives a pastell collection using the #doesNotUnderstand: trick"
	html := htmls first.    "first element from collection, the class is XMLElement, a subclass of XMLNodeWithElements"
	html head               "should call #doesNotUnderstand: again in XMLNodeWithElements but it is not"

As you see the #html message triggers the #doesNotUnderstand: while #head does not.
For strange reasons the XMLNodeWithElements>>#doesNotUnderstand: is only called once and then not anymore.

Did I miss something?

Last time Pastell worked was in Pharo 3.0. Is this a Cog issue or something I do not see?
It seems to work on Mac (according to Stephan Eggermont).

Any idea?

Thanks
T.

[Pharo-dev] Strange DNU effect on Windows with Pastell

Torsten Bergmann