//
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// StringProtocolExtensions.swift
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// SwifterSwift
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//
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// Created by Max Härtwig on 11/26/17.
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// Copyright © 2017 SwifterSwift
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//
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import Foundation
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public extension StringProtocol {
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/// SwifterSwift: The longest common suffix.
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///
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/// "Hello world!".commonSuffix(with: "It's cold!") = "ld!"
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///
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/// - Parameters:
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/// - Parameter aString: The string with which to compare the receiver.
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/// - Parameter options: Options for the comparison.
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/// - Returns: The longest common suffix of the receiver and the given String
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func commonSuffix<T: StringProtocol>(with aString: T, options: String.CompareOptions = []) -> String {
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guard !isEmpty && !aString.isEmpty else { return "" }
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var idx = endIndex
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var strIdx = aString.endIndex
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repeat {
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formIndex(before: &idx)
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aString.formIndex(before: &strIdx)
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guard String(self[idx]).compare(String(aString[strIdx]), options: options) == .orderedSame else {
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formIndex(after: &idx)
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break
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}
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} while idx > startIndex && strIdx > aString.startIndex
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return String(self[idx...])
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}
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}
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