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StringExtensions.swift
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StringExtensions.swift
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
import Foundation
public extension String {
public func contains(other: String) -> Bool {
// rangeOfString returns nil if other is empty, destroying the analogy with (ordered) sets.
if other.isEmpty {
return true
}
return self.rangeOfString(other) != nil
}
public func startsWith(other: String) -> Bool {
// rangeOfString returns nil if other is empty, destroying the analogy with (ordered) sets.
if other.isEmpty {
return true
}
if let range = self.rangeOfString(other,
options: NSStringCompareOptions.AnchoredSearch) {
return range.startIndex == self.startIndex
}
return false
}
public func endsWith(other: String) -> Bool {
// rangeOfString returns nil if other is empty, destroying the analogy with (ordered) sets.
if other.isEmpty {
return true
}
if let range = self.rangeOfString(other,
options: [NSStringCompareOptions.AnchoredSearch, NSStringCompareOptions.BackwardsSearch]) {
return range.endIndex == self.endIndex
}
return false
}
func escape() -> String {
let raw: NSString = self
let str = CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
raw,
"[].",":/?&=;+!@#$()',*",
CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding))
return str as String
}
func unescape() -> String {
let raw: NSString = self
let str = CFURLCreateStringByReplacingPercentEscapes(kCFAllocatorDefault, raw, "[].")
return str as String
}
/**
Ellipsizes a String only if it's longer than `maxLength`
"ABCDEF".ellipsize(4)
// "AB…EF"
:param: maxLength The maximum length of the String.
:returns: A String with `maxLength` characters or less
*/
func ellipsize(let maxLength maxLength: Int) -> String {
if (maxLength >= 2) && (self.characters.count > maxLength) {
let index1 = self.startIndex.advancedBy((maxLength + 1) / 2) // `+ 1` has the same effect as an int ceil
let index2 = self.endIndex.advancedBy(maxLength / -2)
return self.substringToIndex(index1) + "…\u{2060}" + self.substringFromIndex(index2)
}
return self
}
private var stringWithAdditionalEscaping: String {
return self.stringByReplacingOccurrencesOfString("|", withString: "%7C", options: NSStringCompareOptions(), range: nil)
}
public var asURL: NSURL? {
// Firefox and NSURL disagree about the valid contents of a URL.
// Let's escape | for them.
// We'd love to use one of the more sophisticated CFURL* or NSString.* functions, but
// none seem to be quite suitable.
return NSURL(string: self) ??
NSURL(string: self.stringWithAdditionalEscaping)
}
}