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Fun with symbol

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Nicolas Cellier-3

Fun with symbol

About some discussion on Squeak-dev...
Ah, even mature VW is caught sometimes (at leat 7.3.1)

| str |
str := String new writeStream.
#'x:y:z' storeOn: str.
Kernel.Compiler evaluate: str contents readStream

Cheers

nicolas cellier a écrit :
> That's what mature means I guess.
>
> The last is syntactically correct, and correctly parsed by Squeak.
> However Squeak result is quite surprising, debug it to believe it.
>
> Nicolas
>
>
>
> PS: forgot this one:
> Compiler evaluate: '#$'.
> Not to confuse:
> Compiler evaluate: '# $'.
> And:
> Compiler evaluate: '#$ '.
>
> Boris Popov a écrit :
>> If anyone cares, here's VisualWorks' treatment,
>>
>> Compiler evaluate: '#++'.
>> #++
>>
>> Compiler evaluate: '##'.
>> #word, binary, keyword, (, or [ expected ->#
>>
>> Compiler evaluate: '#'.
>> #word, binary, keyword, (, or [ expected ->
>>
>> Compiler evaluate: '# "please" # "print" # "me"'.
>> # "please" word, binary, keyword, (, or [ expected -># "print" # "me"
>>
>> Compiler evaluate: '##()'.
>> #word, binary, keyword, (, or [ expected ->#()
>>
>> Compiler evaluate: '##)'.
>> #word, binary, keyword, (, or [ expected ->#)
>>
>> Compiler evaluate: '##('.
>> #word, binary, keyword, (, or [ expected ->#(
>>
>> Compiler evaluate: '##(##)'.
>> #word, binary, keyword, (, or [ expected ->#(##)
>>
>> Compiler evaluate: '#1'.
>> #word, binary, keyword, (, or [ expected ->1
>>
>> Compiler evaluate: '#-1'.
>> #-Nothing more expected ->1
>>
>> Compiler evaluate: '#--1'.
>> Unhandled exception: Message not understood: #-
>>
>> Cheers!
>>
>> -Boris
>>
>
>
>

Ladislav Lenart

Re: Fun with symbol

nicolas cellier wrote:
> About some discussion on Squeak-dev...
> Ah, even mature VW is caught sometimes (at leat 7.3.1)
>
> | str |
> str := String new writeStream.
> #'x:y:z' storeOn: str.
> Kernel.Compiler evaluate: str contents readStream

Maybe I am missing the point here, but "Compiler class>>evaluate:"
expects aTextOrString and not aReadStream.

Ladislav Lenart

Nicolas Cellier-3

Re: Fun with symbol

In reply to this post by Nicolas Cellier-3

From early ages up to at least 7.3.1 stream were accepted.
So the readStream is not necessary indeed. Maybe it were once, can't remember why i took such a habit...

The point is that #'x:y:z' is printed as #x:y:z which is further interpreted as the message send #x:y: z.
Type a method anywhere say
Object>>foo
^#'x:y:z'
If decompiled code is used and recompiled (via a fileOut/fileIn operation for example)
Then the code is not preserved.

This is a bug. A hardly ever seen and rather theoretical one, but a bug.

Nicolas

De : [hidden email]
Date : 23/05/07 09:31:41
A : [hidden email]
Cc : [hidden email]

Sujet : Re: Fun with symbol

nicolas cellier wrote:
> About some discussion on Squeak-dev...
> Ah, even mature VW is caught sometimes (at leat 7.3.1)
>
> | str |
> str := String new writeStream.
> #'x:y:z' storeOn: str.
> Kernel.Compiler evaluate: str contents readStream

Maybe I am missing the point here, but "Compiler class>>evaluate:"
expects aTextOrString and not aReadStream.

Ladislav Lenart

Dave Stevenson-2

Re: Fun with symbol

In reply to this post by Nicolas Cellier-3

Works fine in current builds.

nicolas cellier wrote:

> About some discussion on Squeak-dev...
> Ah, even mature VW is caught sometimes (at leat 7.3.1)
>
> | str |
> str := String new writeStream.
> #'x:y:z' storeOn: str.
> Kernel.Compiler evaluate: str contents readStream
>
> Cheers
>
>
>
> nicolas cellier a écrit :
> > That's what mature means I guess.
> >
> > The last is syntactically correct, and correctly parsed by Squeak.
> > However Squeak result is quite surprising, debug it to believe it.
> >
> > Nicolas
> >
> >
> >
> > PS: forgot this one:
> > Compiler evaluate: '#$'.
> > Not to confuse:
> > Compiler evaluate: '# $'.
> > And:
> > Compiler evaluate: '#$ '.
> >
> > Boris Popov a écrit :
> >> If anyone cares, here's VisualWorks' treatment,
> >>
> >> Compiler evaluate: '#++'.
> >> #++
> >>
> >> Compiler evaluate: '##'.
> >> #word, binary, keyword, (, or [ expected ->#
> >>
> >> Compiler evaluate: '#'.
> >> #word, binary, keyword, (, or [ expected ->
> >>
> >> Compiler evaluate: '# "please" # "print" # "me"'.
> >> # "please" word, binary, keyword, (, or [ expected -># "print" # "me"
> >>
> >> Compiler evaluate: '##()'.
> >> #word, binary, keyword, (, or [ expected ->#()
> >>
> >> Compiler evaluate: '##)'.
> >> #word, binary, keyword, (, or [ expected ->#)
> >>
> >> Compiler evaluate: '##('.
> >> #word, binary, keyword, (, or [ expected ->#(
> >>
> >> Compiler evaluate: '##(##)'.
> >> #word, binary, keyword, (, or [ expected ->#(##)
> >>
> >> Compiler evaluate: '#1'.
> >> #word, binary, keyword, (, or [ expected ->1
> >>
> >> Compiler evaluate: '#-1'.
> >> #-Nothing more expected ->1
> >>
> >> Compiler evaluate: '#--1'.
> >> Unhandled exception: Message not understood: #-
> >>
> >> Cheers!
> >>
> >> -Boris
> >>
> >
> >
> >
>
>