[REBOL] Re: parse, again...
From: ryanc:iesco-dms at: 1-Nov-2001 9:17
Seems like 'thru 'end always returns false. Try it this way...
>> chars: complement charset []
== make bitset! #{
FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
}
>> html-code: [ copy tag ["<" thru ">"] | copy txt to "<" | some chars]
== [copy tag ["<" thru ">"] | copy txt to "<" | some chars]
>> parse/all read http://www.rebol.com [to "<" some html-code]
== true
>>
If you want to confirm that it is html and not just a text page, add a 'to
<html> in front, otherwise you might get false positives.
--Ryan
Hallvard Ystad wrote:
> I seem to get something wrong. Look here:
> >> html-code: [ copy tag ["<" thru ">"] | copy txt to "<" ]
> == [copy tag ["<" thru ">"] | copy txt to "<"]
> >> parse/all read http://www.rebol.com/ [to "<" some html-code]
> connecting to: www.rebol.com
> == false
>
> This returns false because the website ends with some whitespace after the
> last tag. I redefine 'html-code and try again:
> >> html-code: [ copy tag ["<" thru ">"] | copy txt [to "<" | thru end]]
> == [copy tag ["<" thru ">"] | copy txt [to "<" | thru end]]
> >> parse/all read http://www.rebol.com/ [to "<" some html-code]
> connecting to: www.rebol.com
> == false
>
> Hm. Why does this return false? Another try:
> >> html-code: [ copy tag ["<" thru ">"] | copy txt to "<" | copy txt thru
> end ]
> == [copy tag ["<" thru ">"] | copy txt to "<" | copy txt thru end]
> >> parse/all read http://www.rebol.com/ [to "<" some html-code]
> connecting to: www.rebol.com
> == false
>
> Still wrong return value from 'parse. But then, finally:
> >> html-code: [ copy tag ["<" thru ">"] | copy txt to "<" | skip]
> == [copy tag ["<" thru ">"] | copy txt to "<" | skip]
> >> parse/all read http://www.rebol.com/ [to "<" some html-code]
> connecting to: www.rebol.com
> == true
>
> So I managed, finally. But what if I want to use whatever is written after
> the last tag? And especially: what's wrong with my second approach?
>
> I know this probably is basic, and that it's probably been answered a
> hundred times already on this mailing list, but I just can't seem to find
> the solution (and I _have_ searched, yes).
>
> ~H
>
> Praetera censeo Carthaginem esse delendam
>
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--
Ryan Cole
Programmer Analyst
www.iesco-dms.com
707-468-5400
