Line offset of an item (and other similar functions).
Raymond E. Griffith
rgriffit at ctc.net
Tue Jan 25 07:44:07 CST 2005
> Alex Tweedly wrote:
>> J. Landman Gay wrote:
>>> Like this:
>>> get the number of lines in item 1 to itemoffset(tString,tData) of tData
>> Thank You !
>> I seem to have a mental block against item expressions that cross line
>> boundaries. My over-structured brain *knows* that items are small
>> things that fit within lines; this is the 3rd or 4th time I've missed
>> something because of that blinkered view.
> Nope, spoke too soon. That looks convincing, and worked on my initial
> testing - but doesn't actually work properly in all cases.
> The problem is that the CRs are included within items - so given data like
> etc., item 1 is "a", item 2 is "abc", item 3 is "1
> b" (i.e. including the cr), item 4 is "def", etc.
> Clearly, that means itemOffset will never match what I think of as items
> that are first (or last) on each line.
> In the above case, I want to be able to search for the line containing
> item "b" and find the second line.
> Currently I'm using
>> function findItemAsLineNumber pItem, pData
>> local i, L
>> set wholeMatches to true
>> -- set the itemDel to TAB
>> put 0 into i
>> repeat for each line L in pData
>> add 1 to i
>> if itemOffset(pItem, L) > 0 then return i
>> end repeat
>> return 0
>> end findItemAsLineNumber
> but I still think there should be an easier (or at least faster,
> shorter, better) way.
> -- Alex.
Hmmm. Come to think of it, there should also be a "lineoffset" function.
put lineoffset(pItem,pData) into ptestline
No need for a "repeat for each line" construct, although you'd need to turn
wholeMatches to false. If you are concerned with making sure that you get
an entire item and not a part of it, then you could do a test on it, as,
repeat while ptestline > 0
if pItem is an item of line ptestline of pData then
put lineoffset(pItem,pData,ptestline) into ptestline
Just a thought.
Raymond E. Griffith
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