Number formatting printf/sprintf for Squeak?

>
>
> On Tue, Feb 17, 2009 at 10:44 AM, Sorensen <[hidden email]> wrote:
>>
>> Is there a printf/sprintf-like package for formatting text  for Squeak?
>>
>> If not, how do Squeakers go about formatting currency amounts or left
>> justifying text within a field?
>
>
> My initial reaction was "that's obvious; there are methods in the String
> class", but when I looked I realised that this isn't actually as trivial as
> that.
>
> For printf-like functionality, class String has a "formatting" category with
> undocumented methods. The excellent "Squeak by Example" book has some
> examples (http://scg.unibe.ch/SBE/SBE.pdf, page 208) but the functionality
> is very limited compared with printf.
>
> See also SequenceableCollection>>copyReplaceAll:with:
>
> For formatting currency, I notice there's a Locale class with
> Locale>>primCurrencySymbol, but I can't find any more advanced methods for
> actually formatting a currency, and I can't find any currency classes for
> any Smalltalk dialect on Google (!), apart from an LcMonetary class for GNU
> Smalltalk.
>
> For left-justifying text, I'm a bit surprised that you'd want to do this.
> Typically, you'd make the text left or right justified in whatever GUI
> element that value ends up in, rather than padding it with spaces.
>
> Anyway; some code examples for actually doing the above:
>
> Formatting a currency (specifically in my Locale) with two decimal places:
>
> " I assume that you're using ScaledDecimals for the currency; you generally
> shouldn't use Floats for currency. "
> c := ScaledDecimal newFromNumber: 123.45 scale: 2.
> " It's good practise to use a stream for formatting strings manually "
> stream := WriteStream on: (String new: 30).
> c >= 0 ifTrue: [ stream nextPut: $- ].
> stream nextPutAll: Locale current primCurrencySymbol. " Generally, prim
> methods should be private... "
> c printOn: stream. " Bug: also prints out 's2'. "
> result := stream contents.
>
> I would also add a new method to ScaledDecimal to print out its value
> without appending an 's2'. In fact, I'd probably make a subclass of Number
> or ScaledDecimal called "Currency" and release it as a reusable package.
>
> Left-justifying text with padding:
>
> padding := String new: 40.
> padding replaceAll: (Character value: 0) with: $ .
>
> s := 'format me'.
> result := padding copy replaceFrom: 1 to: s size with: s.
>
> Gulik.
>
>
> --
> http://people.squeakfoundation.org/person/mikevdg
> http://gulik.pbwiki.com/
>
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>

>
> Thanks everybody for your replies.  I'll look at SBE and Seaside 2.9 as well
> for further examples.
>
>> For left-justifying text, I'm a bit surprised that you'd want to do this.
>> Typically, you'd make the text left
>> or right justified in whatever GUI element that value ends up in, rather
>> than padding it with spaces.
>
> You're right.  I'd like to do more than simply left-justify:
>
>   "%6.2f"      34.56     "space-padded right justified"
>   "%-6.2f"  34.56        "space-padded left justified"
>   "%02d"    05            "zero padded left justified"
>
> etc
>
> Your examples though gave me a good place to start.
>
> Many thanks
>
>
> Sorensen wrote:
>>
>> Is there a printf/sprintf-like package for formatting text  for Squeak?
>>
>> If not, how do Squeakers go about formatting currency amounts or left
>> justifying text within a field?
>>
>>
>>
>>
>
> --
> View this message in context: http://www.nabble.com/Number-formatting-printf-sprintf-for-Squeak--tp22045889p22049206.html
> Sent from the Squeak - Beginners mailing list archive at Nabble.com.
>
> _______________________________________________
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>

> There are also some interesting examples of string formatting in the
> DateAndTime class used for printing hours minutes and seconds onto a
> stream. That's where I picked up how Squeak does it (painful I might
> add).
>
> printf (or Java's String.format) are nice. Python has some nice ideas
> here too. Maybe some Smalltalk guru could shed some light on the one
> true way to do this?
>
> David
>
> On Mon, Feb 16, 2009 at 7:15 PM, Sorensen <[hidden email]> wrote:
>>
>> Thanks everybody for your replies.  I'll look at SBE and Seaside 2.9 as well
>> for further examples.
>>
>>> For left-justifying text, I'm a bit surprised that you'd want to do this.
>>> Typically, you'd make the text left
>>> or right justified in whatever GUI element that value ends up in, rather
>>> than padding it with spaces.
>>
>> You're right.  I'd like to do more than simply left-justify:
>>
>>   "%6.2f"      34.56     "space-padded right justified"
>>   "%-6.2f"  34.56        "space-padded left justified"
>>   "%02d"    05            "zero padded left justified"
>>
>> etc
>>
>> Your examples though gave me a good place to start.
>>
>> Many thanks
>>
>>
>> Sorensen wrote:
>>>
>>> Is there a printf/sprintf-like package for formatting text  for Squeak?
>>>
>>> If not, how do Squeakers go about formatting currency amounts or left
>>> justifying text within a field?
>>>
>>>
>>>
>>>
>>
>> --
>> View this message in context: http://www.nabble.com/Number-formatting-printf-sprintf-for-Squeak--tp22045889p22049206.html
>> Sent from the Squeak - Beginners mailing list archive at Nabble.com.
>>
>> _______________________________________________
>> Beginners mailing list
>> [hidden email]
>> http://lists.squeakfoundation.org/mailman/listinfo/beginners
>>
>
>
>
> --
> David Finlayson, Ph.D.
> Operational Geologist
>
> U.S. Geological Survey
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>
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>
> On Wed, Feb 18, 2009 at 02:37:27PM -0500, Matthew Fulmer wrote:
> > On Wed, Feb 18, 2009 at 11:28:29AM -0800, Chris Cunningham wrote:
> > > I'd be leary of basing Currency off of ScaledDecimal, especially if there is
> > > to be much manipulation of it (such as multiplication or division).  The
> > > reason is that ScaledDecimal keeps the representation of their numbers as
> > > fractions under the covers - which can results in some odd (and incorrect)
> > > results.
> >
> > ScaledDecimal is also probably going to be removed from squeak
> > soon, as it has licensing issues.
>
> Arrgh! I started using ScaledDecimal for representing time magnitudes
> in TimeZoneDatabase <http://wiki.squeak.org/squeak/1076> quite some
> time ago, and it works very well and is quite efficient. Are the
> licensing issues resolvable? Can I help?

>
> At Wed, 18 Feb 2009 22:34:08 -0500,
> David T. Lewis wrote:
> >
> > On Wed, Feb 18, 2009 at 02:37:27PM -0500, Matthew Fulmer wrote:
> > > On Wed, Feb 18, 2009 at 11:28:29AM -0800, Chris Cunningham wrote:
> > > > I'd be leary of basing Currency off of ScaledDecimal, especially if there is
> > > > to be much manipulation of it (such as multiplication or division).  The
> > > > reason is that ScaledDecimal keeps the representation of their numbers as
> > > > fractions under the covers - which can results in some odd (and incorrect)
> > > > results.
> > >
> > > ScaledDecimal is also probably going to be removed from squeak
> > > soon, as it has licensing issues.
> >
> > Arrgh! I started using ScaledDecimal for representing time magnitudes
> > in TimeZoneDatabase <http://wiki.squeak.org/squeak/1076> quite some
> > time ago, and it works very well and is quite efficient. Are the
> > licensing issues resolvable? Can I help?
>
>   1.  Try to find  Richard A. Harmon.  I for example looked up the
>       name in Skype and send text chat to all of them, but didn't get
>       any response.  If you know other ways, please try.
>
>   2.  Write a new package.

> At Wed, 18 Feb 2009 22:34:08 -0500,
> David T. Lewis wrote:
> >
> > Arrgh! I started using ScaledDecimal for representing time magnitudes
> > in TimeZoneDatabase <http://wiki.squeak.org/squeak/1076> quite some
> > time ago, and it works very well and is quite efficient. Are the
> > licensing issues resolvable? Can I help?
>
>   1.  Try to find  Richard A. Harmon.  I for example looked up the
>       name in Skype and send text chat to all of them, but didn't get
>       any response.  If you know other ways, please try.
>
>   2.  Write a new package.