I was curious if using the itemDelimiter might work for this, so I wrote
the below code out of curiosity; but in my quick testing with single-byte
characters it was only about 30% faster than the above methods, so I didn't
bother to post it.
But Ben Rubinstein just posted about a terrible slow-down doing pretty much
this same thing for text with unicode characters. So I ran a simple test
with 8000 character long strings that start with a single unicode
character, this is about 15x faster than offset() with skip. For
100,000-character lines it's about 300x faster, so it seems to be immune to
the line-painter issues skip is subject to. So for what it's worth:
function offsetList D,S
-- returns a comma-delimited list of the offsets of D in S
set the itemDel to D
repeat for each item i in S
add length(i) + 1 to C
put C,"" after R
end repeat
set the itemDel to comma
if char -1 of S is D then return char 1 to -2 of R
put length(C) + 1 into lenC
put length(R) into lenR
if lenC = lenR then return 0
return char 1 to lenR - lenC - 1 of R
end offsetList
>
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