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World: r3wp

[Core] Discuss core issues

Izkata
22-Feb-2009
[12604x3]
What context?  Is it being evaluated or now?
or not?*
Rebol from the command line, as well as a running script IS a 'do 
session, that's what we're trying to get at.  'do is what's converting 
the lit-word! into a word! before it reaches the function
Rebolek
22-Feb-2009
[12607]
Paul, when you write 

>>lit-word? 'test 

what is really happening is this: 

>>lit-word? ('test)
Anton
22-Feb-2009
[12608x2]
Paul, I agree with everything BrianH has said in this discussion.
When, you've typed something at the console:

	>> 'test	

, and you press Enter, it is as if this is happening in a script:

	do ['test]


The result is equivalent - a lit-word reduces to a word, which is 
returned.
Rebolek
22-Feb-2009
[12610]
yes, and
>> lit-word? 'a
can be written as
>> do lit-word? do 'a
or 
>> (lit-word? ('a))
[unknown: 5]
22-Feb-2009
[12611x2]
As I said guys it is just me that doesn't like how it lit-word? operates.
As I said before I know what is happening but rather it didn't happen 
that way.
Henrik
22-Feb-2009
[12613x2]
I wonder how you would make it work like you want, because that is 
up to the interpreter, not LIT-WORD?.
>> a: func [b [lit-word!]][return b]
>> a 'test
** Script Error: a expected b argument of type: lit-word
** Near: a 'test
[unknown: 5]
22-Feb-2009
[12615x2]
I made one that works like I want and it doesn't use lit-word? at 
all
>> is-lit-word? 'test
== true
>> is-lit-word? first ['test]
== true
>> is-lit-word? "test"
== false
>> is-lit-word? 'do
== true
Izkata
22-Feb-2009
[12617]
what happens with "is-lit-word? first [test]"  ?
[unknown: 5]
22-Feb-2009
[12618x5]
That would be true also.
>> is-lit-word? first [test]
== true
See to me the question comes down to the fact that I wanted a function 
that tells me what the argument was passed to it as not what the 
function recognizes it as.
So then I have to determine what is a lit-word?  It is merely a word 
that is has the tick symbol at the beginning or is it a word that 
in affect is of the same characteristic as a word with a tick symbol. 
 I chose the latter since it is more in form with REBOL.
http://www.tretbase.com/forum/viewtopic.php?f=8&t=30&p=141#p141
Izkata
22-Feb-2009
[12623]
So.. it looks to me like this is just what you wanted:  any [word? 
val  lit-word? val]
Is it, or does is-lit-word? do something I'm missing?
[unknown: 5]
22-Feb-2009
[12624x2]
Almost does.  I fixed it up a bit for you to give you more of a match 
to my function here:


 a: func [val][if any [word? val lit-word? val][return true] false]

However, you used lit-word? which was what I was avoiding.
I would have to look at it much more to see how closely it matches 
but via the test posted here it seems to work.
[unknown: 5]
23-Feb-2009
[12626x3]
Nope yours doesn't do exactly what I wanted.
Works for most cases but some important ones it fails on.
>> a first reduce [to-word "test"]
== true
>> as-lit-word? reduce [to-word "test"]
== false
Izkata
23-Feb-2009
[12629]
>> a first reduce [to-word "test"]                               
    
== true
>> as-lit-word? first reduce [to-word "test"]
== true
>> a reduce [to-word "test"]      
== false
>> as-lit-word? reduce [to-word "test"]
== false
[unknown: 5]
23-Feb-2009
[12630x6]
oh - lol
I forgot the first.
actually it would be correct in both cases as it would still be a 
block.
Here you go:

>> c: make set-word! 'd
== d:
>> c
== d:
>> a c
== false
>> as-lit-word? c
== true
My function shows that BrianH was wrong.
And many agreed with him are wrong also.
Henrik
23-Feb-2009
[12636]
Paul, I have a hard time following the discussion. Can you show what 
you are right about?
[unknown: 5]
23-Feb-2009
[12637x4]
Sure henrik.
Here is what BrianH said:


You aren't passing 'test as an argument to LIT-WORD? whenn you do 
this:
lit-word? 'test
==false

What you are doing is *evaluating* 'test and then passing *that* 
value to LIT-WORD?. There's a difference.
Obviously that isn't true as my function shows.
Brian is saying that 'test would get evaluated to a word and *THAT* 
value is then in turn passed to lit-word? function.  But that isn't 
the case.  Because if it was indeed a word! at that point then there 
is no way my function could detect it as a lit-word!
Henrik
23-Feb-2009
[12641]
what was the source for as-lit-word? again?
[unknown: 5]
23-Feb-2009
[12642x2]
http://www.tretbase.com/forum/viewtopic.php?f=8&t=30&p=141#p141
as-lit-word?: make function! [  

    "Returns logic on whether the val argument is as a lit-word! type"
    val
    ][
    not error? try [= :val make lit-word! :val]
]
Dockimbel
23-Feb-2009
[12644]
You're using the wrong operator, your should be using == instead 
of = to test for datatype equality.

not error? try [== :val make lit-word! :val]
[unknown: 5]
23-Feb-2009
[12645x4]
You can use that also Doc and it still works.
I have already used both in my function.
A gave the link because the one on my computer actually has the == 
symbol  instead.
I will probably update the website one later.  Still testing some 
other modifications to the function.
Dockimbel
23-Feb-2009
[12649]
>> a: 'test
== test
>> :a == make lit-word! :a
== false
>> :a = make lit-word! :a
== true
Henrik
23-Feb-2009
[12650]
Doc, the problem is that Paul never actually passes a lit-word to 
the function, so he can't test for strict-equal?. It just happens 
to work the way he wants for lit-words.
[unknown: 5]
23-Feb-2009
[12651x2]
>> as-lit-word? 'test
== true
See doc - that is with the strict equal.
Dockimbel
23-Feb-2009
[12653]
What does mean the resulting value of as-lit-word? That no error 
happened? What's the point?