New SqueakMap on the air... and we got problems Houston!

On 26.04.2006, at 02:07, Chris Becker wrote:

> It's the Croquet 1.0.10 image.
>
wouldn't the croquet list then not be better for this question?
Especially when writing a mail that assumes Croquet (without
mentioning it), and even suggest that everyone of course has
seen the error.

      Marcus

Chris Becker a écrit :
While porting some of my classes to VW,
I've implemented a scanner subclass for that problem (attached).
'_' are replaced with ':=' only when '_' is scanned as an assignment.

Here an example that read test.st and write test2.st.

| f |
f := ( FileStream forceNewFileNamed: 'test2.st') .
f nextPutAll: (PlatypusVW5PackageExporterScanner new outPut: (
FileStream fileNamed: 'test.st') contents).
f close

alain

Am 26.04.2006 um 07:23 schrieb Marcus Denker:

> On 26.04.2006, at 02:07, Chris Becker wrote:
>
>> It's the Croquet 1.0.10 image.
>>
> wouldn't the croquet list then not be better for this question?

True, but a newcomer might not know that this is a problem particular  
to Croquet.

> Especially when writing a mail that assumes Croquet (without
> mentioning it), and even suggest that everyone of course has
> seen the error.

It would at least have been helpful, because someone could have  
answered immediately.

Anyway - to allow assignment by underscore in a Croquet image, do this:

        Preferences enable: #allowUnderscoreAssignment

I guess the preference was added to not accidentally re-introduce  
assignment arrows in the Croquet sources.

- Bert -

There have been numerous posts on *this* list relating to changing  
the functionality of underscores (backarrows) in Squeak. If the  
standard Squeak image no longer supports the legacy assignment  
operator, Monticello will have to be changed to convert them to ":=".  
This issue pertains to Squeak functionality, not Croquet functionality.

Chris



On Apr 26, 2006, at 1:23 AM, Marcus Denker wrote:

On 26.04.2006, at 15:31, Chris Becker wrote:

> There have been numerous posts on *this* list relating to changing  
> the functionality of underscores (backarrows) in Squeak

Not the funtionality, it was just about printing _ as _, not  
forbidding to compile _ assigments.

> . If the standard Squeak image no longer supports the legacy  
> assignment operator,

Yes, if it would no longer supports it. But it does... we did not  
even start thinking about removing this. Of course we should, and
it's nice to see that Croquet just did it.

       Marcus

Ah, so the "Underscore conversion in 3.9" thread doesn't refer to changes being incorporated into Squeak 3.9. OK, thank you for clearing that up for me Marcus.

On 26.04.2006, at 16:58, Chris Becker wrote:

> Ah, so the "Underscore conversion in 3.9" thread doesn't refer to  
> changes being incorporated into Squeak 3.9. OK, thank you for  
> clearing that up for me Marcus.

Yes, it does. But there are multiple steps:

1) print _ as _
2) now the code in the image looks bad --> needs to be converted to :=

Both are planned for 3.9a. (that is, 1) is done, 2) not yet completed).

but then:

3) now that there is only := in the image, can we get rid of _ as an  
assigment character?

This we have not yet discussed, and it is *not* planned for 3.9. And  
it needs some thought,
because it brakes loading old code. So we would need tool support for  
that.

       Marcus

I'm quite interested in the underscore topic but sometimes challenged to follow some of the discussions when the underscore character literally used in the discussion.
 
   print _ as _
 
 is actually not such a bad example because I was able to figure out what Marcus meant.  But there were some really bad ones in prior discussions that ended up being completely ambiguous.  Some might be reading in Squeak, for example, so you can't know what they're seeing, maybe:
 
   print <- as <-
 
 (note <- is a crude left arrow in this plain ascii email).
 
 When discussing underscore assignment, may we all make extra effort to be very clear; one suggestion would be to simply spell it out, "underscore" and "left-arrow"..
 
 Thanks..
 

----- Original Message ----
From: Marcus Denker <[hidden email]>
To: The general-purpose Squeak developers list <[hidden email]>
Sent: Wednesday, April 26, 2006 10:24:13 AM
Subject: Re: Loading code containing underscore assignments using Monticello


On 26.04.2006, at 16:58, Chris Becker wrote:

> Ah, so the "Underscore conversion in 3.9" thread doesn't refer to
> changes being incorporated into Squeak 3.9. OK, thank you for
> clearing that up for me Marcus.

Yes, it does. But there are multiple steps:

1) print _ as _
2) now the code in the image looks bad --> needs to be converted to :=

Both are planned for 3.9a. (that is, 1) is done, 2) not yet completed).

but then:

3) now that there is only := in the image, can we get rid of _ as an
assigment character?

This we have not yet discussed, and it is *not* planned for 3.9. And
it needs some thought,
because it brakes loading old code. So we would need tool support for
that.

       Marcus