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Added a new operator (~=) to compare strings. #2

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Added a new operator (~=) to compare strings. #2

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7 changes: 7 additions & 0 deletions Sample/Levenshtein/ViewController.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -128,11 +128,18 @@ class ViewController: UIViewController, UITableViewDataSource, UITableViewDelega
var closeWords: [String] = []
for word in words
{
// To use operator overloading switch the following code for the one commented out.
let distance = string.levenshtein(word, caseSensitive: false, diacriticSensitive: false)
if distance <= treshold
{
closeWords.append(word)
}
/*
if string ~= word
{
closeWords.append(word)
}
*/
}

return closeWords
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13 changes: 11 additions & 2 deletions String+Levenshtein.swift
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Expand Up @@ -8,6 +8,14 @@

import Foundation

func ~= (left: String, right: String) -> Bool
{
let tolerance = 40.0 // Set this to how different (in %) the strings can be while still returning true.
let averageCharacters = Double(left.characters.count + right.characters.count) / 2.0
let threshold = Int(averageCharacters * tolerance / 100)
return left.levenshtein(right, caseSensitive: false, diacriticSensitive: false) <= threshold
}

extension String
{
/**
Expand Down Expand Up @@ -39,8 +47,9 @@ extension String
/**
Compute levenshtein distance between self and given String objects

- parameter anotherString: A String object to compute the distance with
- parameter caseSensitive: Weither or not the comparison should be case sensiste
- parameter anotherString: A String object to compute the distance with
- parameter caseSensitive: Weither or not the comparison should be case sensitive
- parameter diacriticSensitive: Whether or not the comparison should be diacritic sensitive

- returns: An Int representing levenshtein distance, the higher this number is, the more words are distant
*/
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