String manipulation in Apple Script

Issue #89

Today I find that AppleScript allows us to import Foundation, with that we have lots of power, including NSString. See my script

use scripting additions
use framework "Foundation"
property NSString : a reference to current application's NSString

Here is how I can remove last path component from a string

on myRemoveLastPath(myPath)
  set myString to NSString's stringWithString:myPath
  set removedLastPathString to myString's stringByDeletingLastPathComponent
  removedLastPathString as text
end myRemoveLastPath

You need to cast to NSString with NSString's stringWithString: and cast back to Apple Script string with as text. The 's is how you can invoke functions.

One more thing is that we can support parameters to function, like this script

on remove:remove_string fromString:source_string	
  set s_String to NSString's stringWithString:source_string
  set r_String to NSString's stringWithString:remove_string
  return s_String's stringByReplacingOccurrencesOfString:r_String withString:""
end remove:fromString: