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Applescript is ill-equipped to transform formatted text.

(Assigning a text/string variable to a stretch of formatted text coerces it to plain text).

There is sometimes scope for working around this limitation by getting the formatted text into the clipboard, from which it is possible to extract RTF or HTML strings. You can transform these strings, and then put modified formatted text back into the clipboard with pbcopy.

Some illustrative code:

Code:
property pstrTempFile : "tmp.rtf"

tell application id "com.apple.finder"
	
	-- TRY TO GET SOME RTF DATA FROM THE CLIPBOARD
	try
		set dataRTF to the clipboard as «class RTF »
	on error
		display dialog "No RTF in clipboard ..." with title "Get RTF & HTML strings"
		return
	end try
	
	-- RETRIEVE THE RAW RTF STRINGS INTO AN APPLESCRIPT VARIABLE USING PBPASTE
	-- (PBCOPY can be used later to put a transformed version back into the clipboard)
	set the clipboard to dataRTF
	set strRTF to do shell script "pbpaste -Prefer rtf"
	
	
	-- WRITE THE RTF OUT TO A TEMPORARY FILE
	set strTempFolder to (container of (path to me)) as string
	set strTempFile to strTempFolder & pstrTempFile
	set oFile to strTempFile as file specification
	open for access oFile with write permission
	write dataRTF to oFile as «class RTF »
	close access oFile
	
	-- USE TEXTUTIL TO GET AN HTML VERSION OF THE RTF
	-- (HTML can be easier to read and transform,
	-- and TEXTUTIL can be used again later to convert from HTML back to RTF)
	set strTempFile to POSIX path of strTempFile
	set strHTML to do shell script "textutil -convert html -stdout " & strTempFile
	
	{strRTF, strHTML}
end tell

Last edited by RobTrew; 2010-11-04 at 08:08 AM..