I've never tried it but I know it's possible because the script editor does
it. I haven't looked at the scripts in the editor but if you're ambitious
you could.
If I had to do this myself from a cold start, I think I'd use offset with
its skip parameter to sequentially find occurances of the search term in
the text, and keep a list of the offsets as I go. You could do it two ways.
1. Find the first instance and record its offset. Record each subsequent
instance as the user repeats the search. The list would grow incrementally,
and to go backward, the previous instance would just be the line before the
current one.
2. Find all offset instances and record them whenever the search term
changes to get a complete list. You'd need to keep track of which line is
the current instance so you can calculate the one before it as per above.
This method is probably what you'd need to do if you want the search to
start at the bottom of the text or to wrap around to the bottom when going
backwards.
--
Jacqueline Landman Gay | jac...@hyperactivesw.com
HyperActive Software | http://www.hyperactivesw.com
On June 26, 2021 12:21:57 PM Paul Dupuis via use-livecode
<use-livecode@lists.runrev.com> wrote:
I suspect may of us on this list have coded their own Find and Find
Again (or Find Next) commands.
Some may use the Livecode "find" command (find [form] textToFind [in
field]), but I suspect most (as even the Dictionary entry for Find
recommends this) use offset or matchText.. Either approach, using
"Find"or using "offset: (or equivalent) let you do Forward searches
without jumping through hoops.
Many typical applications (MS-Word for example) support searching in
either direction, forward or backwards. It appears Livecode's language
has no support for Backwards searching. I found this positively ancient
enhancement request:
https://quality.livecode.com/show_bug.cgi?id=946 (from 2003!!!)
So, I have the following questions:
1) Has anyone scripted text search (of a field or variable content)
that support forward and backwards searching?
1.1) As the equivalent of Find and Find Again
1.2) With hints, so it shows you snippets of the matches for you to jump
to one rather then advancing sequentially through them?
2) I know the mother ship does not generally comment about future
features, bit is any enhancement to scripted searching planned for
LiveCode 10 or soon after?
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