dunbarx at aol.com dunbarx at aol.com
Thu Oct 29 13:24:08 EDT 2015


Ben makes a point. Several, in fact.

FWIW, I have always just:

get line lineOffset(someText,myField) of myField

I bet you have too. So I never found this too onerous. There are a bunch of these little combo-kluges...


-----Original Message-----
From: Richard Gaskin <ambassador at fourthworld.com>
To: How to use LiveCode <use-livecode at lists.runrev.com>
Sent: Thu, Oct 29, 2015 11:48 am
Subject: "lineAtOffset"?

Currently we have the lineOffset function, a very handy way to know the 
of a line that matches whatever we're searching for in a block of

return-delimited text.

However, like most chunk expressions it's able to do
what it does by 
evaluating every character in the chunk, both looking for the
string and counting CRs as it goes.

Many times when we're using
lineOffset it's because what we're after 
isnt the line number but the text of
that line.  And getting that 
requires another traversal of the entire chunk to
"get line <lineNumber> 
of <chunk>".

Given how handy chunk expressions are
in LiveCode, I'm wondering if it 
might be even handier to see the introduction
of a new function, 
something that could perhaps be called

Like "lineOffset", "lineAtOffset" would take the same
arguments and 
operate similarly, but rather than returning the number of the
line it would return the text of that line.

Questions for you

1. Is this as useful as I think it might be?

2. Is there a better
name for the function?

3. Would consistency with wordOffset, trueWordOffiset,
and itemOffset 
bog this down to the point where we'd either have to face an

inconsistent world in which only lineAtOffset is supported or wait much

longer for a more complete implementation that would also do the others

(itemAtOffset, etc).  Personally, I'd be fine if this were limited to 
since the other chunk types aren't usually long enough in my own 
work to have
much impact on performance having to make two calls.  But 
as I've noted
before, sometimes I'm too easily satisfied and others may 
have more demanding

3. Is this worth submitting to the request queue?

Richard Gaskin
  Fourth World Systems
  Software Design and Development for
the Desktop, Mobile, and the Web
Ambassador at FourthWorld.com               

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