flashforth-devel

[Flashforth-devel] Free form number

[Herman A. <exp...@vn...>]

Hi Mike and all,

I have an old idea, that would be fine to do in FF. In general text frequently used representation of numbers using delimiter characters to separate the groups of digits.
1,048,576
32'768
ff00 fd12
1001 0010 1110
In this form of a long number is well readable, but unusable directly in forth.
We need a forth word to remove all non-number character from the string, then convert the result string to a number. Maybe give the human readable format in a string, then posteriorly convert it:
s" 1100 1001" >>number
Often would be better solution using a word wich collect the real digits from the input stream until a terminal character, then convert it to a number according to the given base or current base.
Example form:
#{ 1,048,576}		\ decimal
${ ff00 fd12}		\ hex
%{ 1001 0010 1110}	\ binary
n{ 32'768}		\ in current base
All above words leave the result on the stack.
What do you think about my conception?

BR
Attila

Re: [Flashforth-devel] Free form number

[Mikael N. <mik...@pp...>]

I could easily extend the FF >number so that it
would work as today but just ignore certain punctuation.

What would be the best choice for punctuation ?
Perhaps the comma character.

Or use the period anywhere in number to indicate that it as double number.
Not having any punctuation in  single numbers. This is how
it is described in Forth Programmers Handbook.

Single precision number
#10,345
%1011,1101,1111,0000
$fad,e

Double precision numbers
%1011_1101_1111_0000.
#10,345.
$fade,babe.
$f,a,d,e,b,a,b,e.


You proposal with separate parsing words can be implemented as an add-on 
if wanted.

BR Mike

Re: [Flashforth-devel] Free form number

[Herman A. <exp...@vn...>]

It is perfect solution to extend the >number to ignor the separator. I think the best choice is the underscore character. The comma disturb me a bit, because it is "decimal point" in hungarian notation. :-) 

Thanks,

BR
Attila

----- Eredeti üzenet -----
Feladó: Mikael Nordman <mik...@pp...>
Dátum: Szerda, Március 26, 2014 6:39
Tárgy: Re: [Flashforth-devel] Free form number
Címzett: fla...@li...


> I could easily extend the FF >number so that it
> would work as today but just ignore certain punctuation.
> 
> What would be the best choice for punctuation ?
> Perhaps the comma character.
> 
> Or use the period anywhere in number to indicate that it as double number.
> Not having any punctuation in  single numbers. This is how
> it is described in Forth Programmers Handbook.
> 
> Single precision number
> #10,345
> %1011,1101,1111,0000
> $fad,e
> 
> Double precision numbers
> %1011_1101_1111_0000.
> #10,345.
> $fade,babe.
> $f,a,d,e,b,a,b,e.
> 
> 
> You proposal with separate parsing words can be implemented as an 
> add-on 
> if wanted.
> 
> BR Mike
> 
> 
> ------------------------------------------------------------------------------
> Learn Graph Databases - Download FREE O'Reilly Book
> "Graph Databases" is the definitive new guide to graph databases and their
> applications. Written by three acclaimed leaders in the field,
> this first edition is now available. Download your free book today!
> 
> _______________________________________________
> Flashforth-devel mailing list
> Fla...@li...
> 

Re: [Flashforth-devel] Free form number

[Mike M. <mi...@mo...>]

Forth typically converts a double number when there is ANY of the following punctuation chrs present anywhere in the number   , . / - :
The exception is a leading - chr which indictes a negative number. See Starting Forth, Leo Brodie.

These punctuations support European and US number and time formats, and many others. I see nothing wrong with adding the _ chr.

FF 4.8 only recognizes a . chr at the end of the digits, so I needed to write my own number conversion word.
A double number format closer to the standard would be nice.

  

Mike Miller
Moon Valley Circuits
mi...@mo...
http://www.moonvalleycircuits.com/


On 3/26/14 10:38 AM, Mikael Nordman wrote:

> I could easily extend the FF >number so that it
> would work as today but just ignore certain punctuation.
>
> What would be the best choice for punctuation ?
> Perhaps the comma character.
>
> Or use the period anywhere in number to indicate that it as double number.
> Not having any punctuation in  single numbers. This is how
> it is described in Forth Programmers Handbook.
>
> Single precision number
> #10,345
> %1011,1101,1111,0000
> $fad,e
>
> Double precision numbers
> %1011_1101_1111_0000.
> #10,345.
> $fade,babe.
> $f,a,d,e,b,a,b,e.
>
>
> You proposal with separate parsing words can be implemented as an add-on
> if wanted.
>
> BR Mike
>
>
> ------------------------------------------------------------------------------
> Learn Graph Databases - Download FREE O'Reilly Book
> "Graph Databases" is the definitive new guide to graph databases and their
> applications. Written by three acclaimed leaders in the field,
> this first edition is now available. Download your free book today!
> http://p.sf.net/sfu/13534_NeoTech
> _______________________________________________
> Flashforth-devel mailing list
> Fla...@li...
> https://lists.sourceforge.net/lists/listinfo/flashforth-devel
>
>

Re: [Flashforth-devel] Free form number

[Mikael N. <mik...@pp...>]

I plan now to do it like this
Just one punctuation char for grouping digits.

Single precision number
#-10.345
%1011.1101.1111.0000
$fad.e

Double precision numbers
%1011.1101.1111.0000.
#-10.345.
$fade.babe.


Mike Miller,
Do you have some code you could share ?
For instance on the FF Wiki. You can add new pages there, just a SF account is needed.

It would be great to get more community contribution to this open source project.

BR Mike

On 03/27/2014 08:25 AM, Mike Miller wrote:
> Forth typically converts a double number when there is ANY of the following punctuation chrs present anywhere in the number   , . / - :
> The exception is a leading - chr which indictes a negative number. See Starting Forth, Leo Brodie.
>
> These punctuations support European and US number and time formats, and many others. I see nothing wrong with adding the _ chr.
>
> FF 4.8 only recognizes a . chr at the end of the digits, so I needed to write my own number conversion word.
> A double number format closer to the standard would be nice.
>
>   
> Mike Miller
> Moon Valley Circuits
> mi...@mo...
> http://www.moonvalleycircuits.com/
>
>
> On 3/26/14 10:38 AM, Mikael Nordman wrote:
>> I could easily extend the FF >number so that it
>> would work as today but just ignore certain punctuation.
>>
>> What would be the best choice for punctuation ?
>> Perhaps the comma character.
>>
>> Or use the period anywhere in number to indicate that it as double number.
>> Not having any punctuation in  single numbers. This is how
>> it is described in Forth Programmers Handbook.
>>
>> Single precision number
>> #10,345
>> %1011,1101,1111,0000
>> $fad,e
>>
>> Double precision numbers
>> %1011_1101_1111_0000.
>> #10,345.
>> $fade,babe.
>> $f,a,d,e,b,a,b,e.
>>
>>
>> You proposal with separate parsing words can be implemented as an add-on
>> if wanted.
>>
>> BR Mike
>>
>>
>> ------------------------------------------------------------------------------
>> Learn Graph Databases - Download FREE O'Reilly Book
>> "Graph Databases" is the definitive new guide to graph databases and their
>> applications. Written by three acclaimed leaders in the field,
>> this first edition is now available. Download your free book today!
>> http://p.sf.net/sfu/13534_NeoTech
>> _______________________________________________
>> Flashforth-devel mailing list
>> Fla...@li...
>> https://lists.sourceforge.net/lists/listinfo/flashforth-devel
>>
>>
>
>
>
> ------------------------------------------------------------------------------
>
>
> _______________________________________________
> Flashforth-devel mailing list
> Fla...@li...
> https://lists.sourceforge.net/lists/listinfo/flashforth-devel