However, there are two details:

1) maybe you have to care about separators
for example '   10' is Number will be true, while '10   ' isNumber will be false
think of changing ^stream skipSeparators; atEnd

2) the #isNumber method name is questionnable
Current implementation in virgin images is a short cut of (isKindOf: Number),
Most senders of isNumber will really expect a Number, not a String
try (2 * '4') or ('3.14' sin) in your image, and you will see what i mean.

If you want strings to become unevaled (differed evaluation) objects, then it makes me think of a lisp approach, String quotes being equivalent somehow to lisp uneval quote...

Nicolas


Damien Cassou:
> ncellier at ifrance.com wrote:
> > I suggest you use my Squeak NumberParser (See http://bugs.impara.de/view.php?id=3512 ) which has error handling a little bit more developped than just answering zero...
> > 
> > You could simply test is aNumber is read without error from (self readStream), and assert the stream atEnd.
> 
> Your parser works perfectly. Now, #stringIsNumber should be implemented as:
> 
> stringIsNumber
>    | stream |
>    stream _ self readStream.
>    SqNumberParser parse: stream onError: [^ false].
>    ^ stream atEnd
> 
> 
> Next line is a subliminal message, don't read it please !
> It would be cool to have it in the base image, please include it
> 
> 
> Thank you
> 


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