Parse Reverse
[1/6] from: rondon:andrade:uol at: 5-Nov-2001 9:19
Hi!
Is there any way to make a parse from the left to right ? From the end of
data to the beginning?
It should be cool if we could have a refinement in parse, such as
parse/all/reverse. Is it very hard to be implemented ?
Thanks in advance.
Rondon
[2/6] from: brett:codeconscious at: 5-Nov-2001 23:31
Only this.
parse head reverse data-to-parse
Brett.
[3/6] from: rondon:andrade:uol at: 5-Nov-2001 12:46
I'm gonna try it ok.
Thanks Brett!
[4/6] from: nitsch-lists:netcologne at: 6-Nov-2001 4:02
RE: [REBOL] Parse Reverse
[rondon--andrade--uol--com--br] wrote:
> Hi!
>
> Is there any way to make a parse from the left to right ? From the end of
> data to the beginning?
>
ugly, but
>> parse probe head reverse "hello world" [copy txt to "olleh" to end]
dlrow olleh
== true
>> head reverse txt
== " world"
also there is find/reverse, but no real parse..
> It should be cool if we could have a refinement in parse, such as
> parse/all/reverse. Is it very hard to be implemented ?
>
would like a real parse/reverse a lot too.
-Volker
[5/6] from: ammonjohnson:ya:hoo at: 6-Nov-2001 16:32
I am not a parse guru by any means, but
----- Original Message -----
From: <[nitsch-lists--netcologne--de]>
To: <[rebol-list--rebol--com]>
Sent: Monday, November 05, 2001 8:02 PM
Subject: [REBOL] Re: Parse Reverse
> RE: [REBOL] Parse Reverse
>
> [rondon--andrade--uol--com--br] wrote:
> >
> > Hi!
> >
> > Is there any way to make a parse from the left to right ? From the end
of
> > data to the beginning?
> >
>
> ugly, but
>
> >> parse probe head reverse "hello world" [copy txt to "olleh" to end]
I would think something like:
>> parse probe head reverse "hello world" [copy txt to reverse "hello" to
end]
would be easier to understand, & easier to code, albeit does take more
resources.
My 2¢
Ammon
[6/6] from: nitsch-lists:netcologne at: 7-Nov-2001 0:02
RE: [REBOL] Re: Parse Reverse
[ammonjohnson--yahoo--com] wrote:
> I am not a parse guru by any means, but
> ----- Original Message -----
<<quoted lines omitted: 6>>
> >> parse probe head reverse "hello world" [copy txt to reverse "hello" to
> end]
except it does not work :(
** Script Error: Invalid argument: ?native?
words in parse are meant to be other blocks for sub-parserules.
so [reverse[hello"]] is invalid.
usually one could try to use compose before, but then
the compose-marking brackets are also used by parse itself.
so composing parse-expressions is difficult.
-Volker
Notes
- Quoted lines have been omitted from some messages.
View the message alone to see the lines that have been omitted