OK, I may be going in the wrong direction here, but ....
put (the opening string) into temp
set the itemDelimeter to temp
put the number of chars in item 1 to -2 of theWholeText into theAnswer
??
Alex.
On 23/03/2023 17:24, François via use-livecode wrote:
Yes, this is the big picture.
Plus, some environments may live within other environments.
And yes, one of the things the app does all the time is finding matched opening
strings and closing strings, like finding matched parentheses in a programming
language.
Fun, as you said!
François
Le 23 mars 2023 à 18:17, Craig Newman via use-livecode
<use-livecode@lists.runrev.com> a écrit :
Fun, fun…
So if you collect ALL the opening and closing strings, and hopefully these
never overlap, then each pair can be “ordered”. Now identifying each is just a
matter of thinking in terms of “pairs” of offsets. You can then identify each
by their “paired” position in the forward direction.
Or am i missing it still?
Craig
On Mar 23, 2023, at 12:29 PM, François via use-livecode
<use-livecode@lists.runrev.com> wrote:
An example of when a backwards search would be useful is the following:
In the app, you have to find command environments. Environments are delimited
by an opening string and a closing string.
Usually, I search forward for the opening string, then search for the closing
string afterwards. Once this occurrence is processed, the app goes on with a
forward search.
Now another problem: I want to see in which environment a text position is in,
i.e. finding the enclosing opening and closing strings.
Looking for the closing string is a no brainer. Looking for the opening string
is no more difficult if I can do a backwards search.
However, if I can only search forward, I must start the search at the beginning
of the text to scan all the occurrences of the opening string that stand before
the text position (if any). The complexity of this approach is not the same as
in the case where a backwards search is available.
François
Le 23 mars 2023 à 16:48, Craig Newman via use-livecode
<use-livecode@lists.runrev.com> a écrit :
Francois.
I am sure you know what you have and what you need.
But just for my curiosity, if I had to do what you want, I would have used the
“offset” function and its “charsToSkip” parameter to find all instances of the
text to find, and then use those values in sequence to work backwards. But then
how do you know when to stop?
Craig
On Mar 23, 2023, at 11:30 AM, François via use-livecode
<use-livecode@lists.runrev.com> wrote:
The text source is not very big.
However I implement transcoding from one language to another and I do an VERY
large amount of search and replace.
I think I have quite optimized my LC code but transcoding can take 5 minutes to
do, and I need the whole process to chase unexpected bugs. This is using the
forward search (offset) most of the time.
Using a standalone app takes the time down to 4 minutes, which is not a
sufficient gain for my usage.
François
Le 23 mars 2023 à 16:21, Craig Newman via use-livecode
<use-livecode@lists.runrev.com> a écrit :
Francois.
Who wouldn’t?
But unless you are working with VERY large datasets, I bet a handler would
process quickly.
Craig
On Mar 23, 2023, at 10:58 AM, François via use-livecode
<use-livecode@lists.runrev.com> wrote:
@Ben
Too bad…
@ Craig
I would rather have an optimized version, I do a lot of text processing in my
app.
Thanks to both of you!
François
Le 23 mars 2023 à 14:43, Craig Newman via use-livecode
<use-livecode@lists.runrev.com> a écrit :
@Ben.
20 years! Congratulations!.
@Francois
This can be scripted easily. Do you need help with that?
Craig
On Mar 23, 2023, at 8:21 AM, Ben Rubinstein via use-livecode
<use-livecode@lists.runrev.com> wrote:
https://quality.livecode.com/show_bug.cgi?id=584 (20th anniversary this
September!)
Also
https://quality.livecode.com/show_bug.cgi?id=8353
On 23/03/2023 11:35, François via use-livecode wrote:
I would like to search for a string within another string, starting at a given
position, but backward.
In some languages, you can achieve that by providing a negative number for the
initial position of the search.
Is this possible in LiveCode?
TIA
François
_______________________________________________
use-livecode mailing list
use-livecode@lists.runrev.com
Please visit this url to subscribe, unsubscribe and manage your subscription
preferences:
http://lists.runrev.com/mailman/listinfo/use-livecode
_______________________________________________
use-livecode mailing list
use-livecode@lists.runrev.com
Please visit this url to subscribe, unsubscribe and manage your subscription
preferences:
http://lists.runrev.com/mailman/listinfo/use-livecode
_______________________________________________
use-livecode mailing list
use-livecode@lists.runrev.com
Please visit this url to subscribe, unsubscribe and manage your subscription
preferences:
http://lists.runrev.com/mailman/listinfo/use-livecode
_______________________________________________
use-livecode mailing list
use-livecode@lists.runrev.com
Please visit this url to subscribe, unsubscribe and manage your subscription
preferences:
http://lists.runrev.com/mailman/listinfo/use-livecode
_______________________________________________
use-livecode mailing list
use-livecode@lists.runrev.com
Please visit this url to subscribe, unsubscribe and manage your subscription
preferences:
http://lists.runrev.com/mailman/listinfo/use-livecode
_______________________________________________
use-livecode mailing list
use-livecode@lists.runrev.com
Please visit this url to subscribe, unsubscribe and manage your subscription
preferences:
http://lists.runrev.com/mailman/listinfo/use-livecode
_______________________________________________
use-livecode mailing list
use-livecode@lists.runrev.com
Please visit this url to subscribe, unsubscribe and manage your subscription
preferences:
http://lists.runrev.com/mailman/listinfo/use-livecode
_______________________________________________
use-livecode mailing list
use-livecode@lists.runrev.com
Please visit this url to subscribe, unsubscribe and manage your subscription
preferences:
http://lists.runrev.com/mailman/listinfo/use-livecode
_______________________________________________
use-livecode mailing list
use-livecode@lists.runrev.com
Please visit this url to subscribe, unsubscribe and manage your subscription
preferences:
http://lists.runrev.com/mailman/listinfo/use-livecode
_______________________________________________
use-livecode mailing list
use-livecode@lists.runrev.com
Please visit this url to subscribe, unsubscribe and manage your subscription
preferences:
http://lists.runrev.com/mailman/listinfo/use-livecode
_______________________________________________
use-livecode mailing list
use-livecode@lists.runrev.com
Please visit this url to subscribe, unsubscribe and manage your subscription
preferences:
http://lists.runrev.com/mailman/listinfo/use-livecode
