I’ve been looking at how to parse
sentences from text recently.
While I’m still looking for a more Machine Learning approach, I found
NSStringEnumerationBySentences which can get me there faster (for now). I
need to get all of the sentences from a given String. This could easily be an
Objective-C category method. But, I’m trying to learn as much Swift as I can.
I haven’t played with extensions yet. Here we go. enumerateSubstringsInRange:options:usingBlock: is what I’ll need, but I need
the extension first:
extension String {
var fullSentences: [String] {
}
}Fiddling with Swift’s closure syntax for a little while, and using the shorthand for NSStringEnumerationBySentences, I end up with this:
extension String {
var fullSentences: [String] {
var sentences = [String]()
let range = self.rangeOfString(self)
self.enumerateSubstringsInRange(range, options: .BySentences) { substring, substringRange, enclosingRange, inout in
sentences += substring
}
return sentences
}
}This could have been condensed even more, but I find this very hard to read:
extension String {
var fullSentences: [String] {
var sentences = [String]()
let range = self.rangeOfString(self)
self.enumerateSubstringsInRange(range, options: .BySentences) { substring, _, _, _ in
sentences += substring
}
return sentences
}
}Ah, but alas. Now I can’t use this in Objective-C. It won’t see the String extension. It needs to be NSString:
extension NSString {
var fullSentences: [String] {
var sentences = [String]()
let range = self.rangeOfString(self)
self.enumerateSubstringsInRange(range, options: .BySentences) { substring, substringRange, enclosingRange, inout in
sentences += substring
}
return sentences
}
}I haven’t quite figured out the naming convention for Swift Extension files yet. Right now, I have this in StringExtentions.swift in my categories folder. Though…. I guess to be proper it should be NSStringExtentions.swift…