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World: r3wp

[Core] Discuss core issues

Maxim
11-Feb-2007
[7140x6]
oh my... I just found it... 

 same?  :select get in system/words 'select
== false
seems some code redefines select somewhere...   >:-(
well, thanks for bearing with me... your words vs lit-words  idea... 
got me probing differently..
strangely, I can't trace where that is happeneing... willl try to 
protect the word...
well, as usually protect doesn't help... arrgh.
(as usuall)
Anton
11-Feb-2007
[7146]
protect doesn't help ? Is SELECT redefined despite being protected 
?
Maxim
11-Feb-2007
[7147x5]
well, protect, only helps within the global context... which is why 
I wish there was /HARD mode which protected ANY setup of a specific 
word.
probably also can protect word within a context... but at that point, 
the damage is usually done.
I've discoverd another way to discover where a set occurs... within 
objects, you look at the first... and the natural order of words, 
is a telling clue...
first self
well found it... and its a biggie  :-(   deep within glayout... well... 
its actually pretty easy for fix there, though.
Maxim
12-Feb-2007
[7152]
why the hell did I use select... its actually quite strange that 
this is the first time I've hit this snag in 3 years though !
Anton
12-Feb-2007
[7153x2]
I should just point out that only the system/words object can grow 
dynamically.
Other objects have fixed order of words.
Maxim
12-Feb-2007
[7155]
the issue is that as it is a commonly used feature, although easy 
to fix within glayout... many references to in my apps will break... 
ahh...
Anton
12-Feb-2007
[7156]
The order does not change after the initial SET.
Maxim
12-Feb-2007
[7157]
yes.
Anton
12-Feb-2007
[7158]
>> set 'var-1 1
== 1
>> set 'var-2 2
== 2
>> set 'var-1 3
== 3
>> print mold skip tail first system/words -4
[Comments in-obj var-1 var-2]
Maxim
12-Feb-2007
[7159x4]
how the hell did I not realise I was overiding such a core word? 
 sometimes the obvious just slips by...  when you're looking the 
other way   ' :-/
yes anton, which is why I discovered where it was being set... after 
a func called 'layout (this one voluntarily being an override)
It would be nice in R3 if we could remove things from an object when 
deriving with make... (we can , sort of, using the 'THIRD accessor 
on an object and editing it....)
but when the object is being created by another controler (like in 
view) then we can't really...
PeterWood
12-Feb-2007
[7163]
So you'd really like Rebol to have the equivalent of JavaScript's 
Delete operator?
Maxim
12-Feb-2007
[7164x2]
hum don't know about it... but if I could do 

obj: make/without ref-obj [] [select]

We could already shrink our objects, when its needed.
binding would then have to replace any object-local bindings of select 
to the global context and raise an error if it doesn't exist, as 
it would if you had tried to define a new object with select undefined 
in any place.
PeterWood
12-Feb-2007
[7166x2]
One think that I like in JavaScript is the flexibility to freely 
add and remove members from object instances and object prototypes 
.
think -> thing
Maxim
12-Feb-2007
[7168x2]
it is usefull only when it is something which is not automatic like 
in python, where its nightmarish.
if you inadvertently typo , then you create a new member!  talk about 
hard to debug errors!!
Joe
13-Feb-2007
[7170]
how does the path native work ? I couldn't find it in the rebol dictionary
BrianH
13-Feb-2007
[7171]
Joe, that native is an accidently exposed internal function. It has 
no use externally.
Henrik
14-Feb-2007
[7172]
If I'm calling a function with many different refinements and the 
function has to work recursively and all refinements must be maintained 
throughout recursion, is there an easy way to get the function call 
with all refinements?

I'm using:


>> f: func [/a /b] [to-path remove-each p reduce ['f all [a 'a] all 
[b 'b]] [none? p]]

>> f
== f
>> f/a
== f/a
>> f/b/a
== f/a/b ; lose refinement order
Anton
14-Feb-2007
[7173x4]
I'm not sure if this helps but I sometimes make a wrapper function 
which calls the actual recursive function. The wrapper could take 
the refinements and set some flags in a context shared by all calls 
to the inner recursion function.
Oh hang on, your question indicates that your example code above 
is currently working, but you are looking for a better way. Is that 
correct ?
A "how was this function called ?" function. I don't think there 
is a way. (although in recent discussion on BIND?....)
ooh.. actually....
Henrik
14-Feb-2007
[7177]
1. it currently works but is clumsy, I think
2. "how was this function called ?" = yes
Anton
14-Feb-2007
[7178]
How about this:
>> f: func [/a /b][print mold second bind? 'a]
>> f/a/b
[true true]
:)
Henrik
14-Feb-2007
[7179x2]
there is something about that you don't know the actual function 
name inside the function? if only the refinements and their order 
could be managed.
testing...
Anton
14-Feb-2007
[7181x2]
That's right, since several words can refer to the same function, 
it has no "one" word.
(it also could be an anonymous function)
Henrik
14-Feb-2007
[7183]
well, that only brings up a block and the refinement order is still 
off, which would be a problem if your refinements have arguments
Anton
14-Feb-2007
[7184x2]
I see.
I think you must pass in the code which is used to launch the function 
as a function argument :)
Henrik
14-Feb-2007
[7186]
nasty!
Anton
14-Feb-2007
[7187]
yep :)
Henrik
14-Feb-2007
[7188x2]
I wonder how hard this would be to implement in a single function. 
Probably very hard if functions internally are unaware of refinement 
order
very hard = impossible :-)