Re: Now, I have “Left(StringSource, CharCount)” and “Right(StringSource, CharCount)”
Re: Now, I have “Left(StringSource, CharCount)” and “Right(StringSource, CharCount)”
- Subject: Re: Now, I have “Left(StringSource, CharCount)” and “Right(StringSource, CharCount)”
- From: Christopher Nebel <email@hidden>
- Date: Mon, 27 Oct 2008 18:47:23 -0700
On Oct 26, 2008, at 7:40 AM, Emile SCHWARZ wrote:
Here are the two other functions to work with string (that I missed,
more or less):
display dialog my StringLeft("Salut les filles.", 5) -- Display:
“Salut”
display dialog my StringRight("Salut les filles.", 7) -- Display:
“filles.”
-- ********** ********** ********** ********** **********
--
-- “StringLeft(StringSource, CharCount)” handler definition
on StringLeft(StringSource, CharCount)
-- StringSource: the string you want to extract characters from
-- CharCount: the number of characters you want to get back
-- TargetString: the stripped string to be returned
-- declare some variables
set TargetString to ""
-- store the wanted string
set TargetString to (characters 1 thru CharCount of StringSource)
as string
-- return the wanted string
return TargetString
end StringLeft
-- ********** ********** ********** ********** **********
--
-- “StringRight(StringSource, CharCount)” handler definition
--
on StringRight(StringSource, CharCount)
-- StringSource: the string you want to extract characters from
-- CharCount: the number of characters you want to get back
-- TargetString: the stripped string to be returned
-- declare some variables
set TargetString to ""
set StringOffset to 0
set StringLength to 0
-- compute the source string length
set StringLength to count of characters in StringSource
-- compute the string offset
set StringOffset to (StringLength - CharCount) + 1
-- store the wanted string
set TargetString to (characters StringOffset thru ((StringOffset -
1) + CharCount) of StringSource) as string
-- return the wanted string
return TargetString
end StringRight
PS: if there is room to improve these handlers, please, share.
Reduced to their bare minimum:
to StringLeft(s, n)
return text 1 thru n of s
end StringLeft
to StringRight(s, n)
return text -n thru -1 of s
end StringRight
For StringRight, we're exploiting AppleScript's feature of negative
indexes, which are defined to count backwards from the end of the
container.
--Chris Nebel
AppleScript Engineering
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