WeirdIdea.swift

import UIKit

extension String {
    var length: Int {return count(self)}
}

func nextBinaryTrialIndex(seriesSize: Int, index: Int, pass: Bool) -> Int? {

    //Error No case exists
    if index >= seriesSize || index <= 0 {
        return nil
    }

    //base case 1
    if pass && index == (seriesSize - 1) {
        return index
    }

    return pass ? (((seriesSize - index) / 2) + 1) : seriesSize / 2
}

func textWillTruncate(text: String, textBounds: CGSize, font: UIFont?) -> Bool {

    let font = font ?? UIFont.systemFontOfSize(UIFont.systemFontSize())
    let fontSize =  (text as NSString).sizeWithAttributes([NSFontAttributeName: font])
    return (fontSize.height > textBounds.height || fontSize.width > textBounds.width)
}

func trailingString(string: String, charLimit: Int) -> String {
    let trailingString = "***"
    let trailingStringSize = trailingString.length

    if string.length < trailingStringSize + 1 || charLimit < 4 {
        return string
    }

    let limitedString = string.substringToIndex(advance(string.startIndex, charLimit))

    return string.substringToIndex(advance(limitedString.endIndex, -trailingStringSize)) + trailingString
}


func smartTrailingString(let trailingLabel: UILabel, targetSubString: String) -> String {
    let originalText = trailingLabel.text ?? ""
    let font = trailingLabel.font
    let bounds = trailingLabel.bounds.size
    var result = originalText

    if !textWillTruncate(originalText, bounds, font) {
        return originalText
    }

    var targetStringLimit = targetSubString.length
    var pass = false
    var nextText: String

    do {

        let eliptifiedString = trailingString(targetSubString, targetStringLimit)
        nextText = originalText.stringByReplacingOccurrencesOfString(targetSubString, withString: eliptifiedString)
        pass = !textWillTruncate(nextText, bounds, font)

        if pass {
            break
        } else {
            targetStringLimit -= 1
        }

    } while targetStringLimit > 0
    
    return nextText
}