REBOL "issues"

[1/16] from: dukeofperl:ml1 at: 5-Nov-2010 21:49

I'm reading: http://www.rebol.com/docs/core23/rebolcore-3.html Am I to understand that _all_ issues have the _#_ prefix? If so, then are binary values "issues" as well? From the above document: #{42652061205245424F4C} -- Duke

[2/16] from: izkata:g:mail at: 5-Nov-2010 23:57

All issue!s start with #, but not all that start with # are issue!s:

>> type? #"r"

== char!

>> type? #foo

== issue!

>> type? #{44}

== binary!

>> issue? #"r"

== false

>> issue? #{44}

== false On Fri, Nov 5, 2010 at 10:49 PM, Duke Normandin <dukeofperl-ml1.net> wrote:

> I'm reading: > http://www.rebol.com/docs/core23/rebolcore-3.html

<<quoted lines omitted: 6>>

> To unsubscribe from the list, just send an email to > lists at rebol.com with unsubscribe as the subject.

-- <*>

[3/16] from: dhsunanda:gma:il at: 6-Nov-2010 10:24

> Am I to understand that _all_ issues have the _#_ prefix? If so, then > are binary values "issues" as well? From the above document: > > #{42652061205245424F4C}

The documentation is a little unclear there. Or, from another perspective, # is somewhat overloaded: #{....} is binary! #"." is character! #.... is issue! An issue! cannot contain a opening or closing brace, nor can it contain a double quote, so the three uses of # are quite separate. Sunanda

[4/16] from: dukeofperl:ml1 at: 6-Nov-2010 5:51

On Sat, 6 Nov 2010, Sunanda wrote:

> > Am I to understand that _all_ issues have the _#_ prefix? If so, then > > are binary values "issues" as well? From the above document:

<<quoted lines omitted: 7>>

> An issue! cannot contain a opening or closing brace, nor can it contain > a double quote, so the three uses of # are quite separate.

So _exactly_ what is the significance of _#_? BTW, is "overloading" a REBOL practice that I'll be discovering to be the rule and not the exception? :) -- Duke

[5/16] from: gregg:pointillistic at: 6-Nov-2010 10:27

Hi Duke, DN> So _exactly_ what is the significance of _#_? It's simple a lexical element in the REBOL grammar. Imagine the parser going along, breaking a string of characters up and identifying the types and values. When it comes to a space, the next character guides it. Is it a digit? Then we need to go further and see if it's a decimal or an integer. If we see a dollar sign, it's a money! value. If we see a # followed by an alphanum, it's an issue. If it's a # followed by a quote, bracket, or curly brace, it's a char, serialized value, or binary, etc. More importantly for humans, issue! was intended for serial numbers, IDs, and the like, which makes the # sigil a good fit. DN> BTW, is "overloading" a REBOL practice that I'll be discovering to DN> be the rule and not the exception? :) No. This is not considered overloading. REBOL is still an ASCII language, and the lexical space is very tight. # has been pressed into service for a few notations, which makes it a bit of an exception. -- Gregg

[6/16] from: dukeofperl:ml1 at: 6-Nov-2010 11:55

On Sat, 6 Nov 2010, Gregg Irwin wrote:

> Hi Duke, > DN> So _exactly_ what is the significance of _#_?

<<quoted lines omitted: 6>>

> followed by a quote, bracket, or curly brace, it's a char, serialized > value, or binary, etc.

I see the rationale! Thanks... -- Duke

[7/16] from: tim-johnsons:web at: 6-Nov-2010 11:06

* Izkata <izkata-gmail.com> [101105 22:03]:

> All issue!s start with #, but not all that start with # are issue!s: > >> type? #"r"

<<quoted lines omitted: 7>>

> >> issue? #{44} > == false

;; :) Another console session

>> series? #foo

== true

>> type? #foo

== issue!

>> type? #{44}

== binary!

>> series? #{44}

== true -- Tim tim at johnsons-web.com or akwebsoft.com http://www.akwebsoft.com

[8/16] from: dukeofperl:ml1 at: 6-Nov-2010 17:10

On Sat, 6 Nov 2010, Tim Johnson wrote:

> * Izkata <izkata-gmail.com> [101105 22:03]: > > All issue!s start with #, but not all that start with # are issue!s:

<<quoted lines omitted: 19>>

> >> series? #{44} > == true

So an "issue" is also a "series" which in turn is also what? etc etc. How far up does it goes? I can see why a parser may need this, but programmers? Let me get my feet a little wetter with REBOL before I make the mistake of voicing an _uninformed opinion. :) BTW, maybe leave an empty line before and after your words of wisdom - they'll stand out better. :) -- Duke

[9/16] from: dhsunanda:gma:il at: 7-Nov-2010 0:17

> So an "issue" is also a "series" which in turn is also what? etc > etc. How far up does it goes? I can see why a parser may need this, > but programmers? Let me get my feet a little wetter with REBOL before > I make the mistake of voicing an _uninformed opinion. :) > > There is a slightly out-of-date datatype hierarchy here:

http://www.mail-archive.com/list-rebol.com/msg02743.html It looks like a fun execise to produce a complete hierarchy by finding all datatypes and checking which contain the others. Easy to do in an R3 script. Probably doable in an R2 script. Have fun trying. Sunanda.

[10/16] from: izkata:gm:ail at: 6-Nov-2010 19:31

On Sat, Nov 6, 2010 at 7:17 PM, Sunanda Dh <dhsunanda-gmail.com> wrote:

> > > > So an "issue" is also a "series" which in turn is also what? etc > > etc. How far up does it goes? I can see why a parser may need this, > > but programmers? >

Path notation (array-type access) works in some way on all series! types, math works on all number! types, an so on. It helps handle crossover. I say "in some way" on all series! types because the file! type handles it specially, creating a directory path instead of accessing the series in an array-like way, and binary! doesn't seem to allow setting, just getting.

> Let me get my feet a little wetter with REBOL before > > I make the mistake of voicing an _uninformed opinion. :)

<<quoted lines omitted: 6>>

> Probably doable in an R2 script. Have fun trying. > Sunanda.

I can vaguely remember someone did do an R2 one years ago. It generated a table, and saved it as an image, where <X column datatype> is a subset of <Y column datatype>, or something like that. -- <*>

[11/16] from: tim-johnsons:web at: 7-Nov-2010 7:47

* Duke Normandin <dukeofperl-ml1.net> [101106 16:14]:

> So an "issue" is also a "series" which in turn is also what? etc > etc. How far up does it goes?

I believe that series! is descended from any-type! which all types are descended from. And I believe that there is only one layer of subtypes. I.E. any-type!/series!/issue! etc..

> I can see why a parser may need this but programmers?

Wweellll... this programmer does not take advantage of all rebol datatypes but I find it very handy for runtime typechecking, including the function interface. -- Tim tim at johnsons-web.com or akwebsoft.com http://www.akwebsoft.com

[12/16] from: M8R-kr0jkp:mailinator at: 8-Nov-2010 16:50

#[[Sunanda There is a slightly out-of-date datatype hierarchy here: http://www.mail-archive.com/list-rebol.com/msg02743.html Sunanda]] - see also: http://www.rebol.net/wiki/Datatypes http://en.wikibooks.org/wiki/REBOL_Programming/Language_Features/Types #[[Tim I believe that series! is descended from any-type! which all types are descended from. And I believe that there is only one layer of subtypes. I.E. any-type!/series!/issue! etc.. Tim]] - actually, that is not correct, it is as follows: any-type!/series!/any-string!/issue! (in R2) -Ladislav

[13/16] from: tim-johnsons:web at: 8-Nov-2010 12:48

* Ladislav <M8R-kr0jkp-mailinator.com> [101108 06:53]:

> #[[Sunanda > There is a slightly out-of-date datatype hierarchy here:

<<quoted lines omitted: 9>>

> Tim]] - actually, that is not correct, it is as follows: > any-type!/series!/any-string!/issue!

:) Did'ya get that Duke. Don't let your head explode! It will sink in over time. After 10 years,for me, it is *still* sinking in. -- Tim tim at johnsons-web.com or akwebsoft.com http://www.akwebsoft.com

[14/16] from: dukeofperl:ml1 at: 8-Nov-2010 16:03

On Mon, 8 Nov 2010, Tim Johnson wrote:

> * Ladislav <M8R-kr0jkp-mailinator.com> [101108 06:53]: > > #[[Sunanda

<<quoted lines omitted: 16>>

> :) Did'ya get that Duke. Don't let your head explode! It will sink > in over time. After 10 years,for me, it is *still* sinking in.

Yep! I read it! How have you managed to resist the REBOL "layers" tectonics for ten years. :) Must have something to do with that Kodiak moonshine you guys have access to up there. ;D I'm hanging in there... -- Duke

[15/16] from: tim-johnsons:web at: 8-Nov-2010 16:04

* Duke Normandin <dukeofperl-ml1.net> [101108 15:13]:

> Yep! I read it! How have you managed to resist the REBOL "layers" > tectonics for ten years. :) Must have something to do with that > Kodiak moonshine you guys have access to up there. ;D > > I'm hanging in there...

I was a cannery rat and commercial fisherman out of Kodiak in the 70's. Now I make my moonshine (home-brewed wine and beer) in Palmer... You can see what I see while I'm coding at akwebsoft.com -- Tim tim at johnsons-web.com or akwebsoft.com http://www.akwebsoft.com

[16/16] from: dukeofperl:ml1 at: 8-Nov-2010 18:59

On Mon, 8 Nov 2010, Tim Johnson wrote:

> * Duke Normandin <dukeofperl-ml1.net> [101108 15:13]: > >

<<quoted lines omitted: 7>>

> Palmer... You can see what I see while I'm coding at > akwebsoft.com

Likewise! Except I'm looking at the Eastern Slopes of the Canadian Rockies, S.W. of Calgary, Alberta. :) and instead of getting busy programming, I dream of fly-fishing for trout in those mountain and foothill stream. Only about 240 days to go ... -- Duke

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