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Swift-friendly NSScanner methods
// NSScanner+Swift.swift
// A set of Swift-idiomatic methods for NSScanner
//
// (c) 2015 Nate Cook, licensed under the MIT license
import Foundation
extension NSScanner {
// MARK: Strings
/// Returns a string, scanned as long as characters from a given character set are encountered, or `nil` if none are found.
func scanCharactersFromSet(set: NSCharacterSet) -> String? {
var value: NSString? = ""
if scanCharactersFromSet(set, intoString: &value),
let value = value as? String {
return value
}
return nil
}
/// Returns a string, scanned until a character from a given character set are encountered, or the remainder of the scanner's string. Returns `nil` if the scanner is already `atEnd`.
func scanUpToCharactersFromSet(set: NSCharacterSet) -> String? {
var value: NSString? = ""
if scanUpToCharactersFromSet(set, intoString: &value),
let value = value as? String {
return value
}
return nil
}
/// Returns the given string if scanned, or `nil` if not found.
func scanString(str: String) -> String? {
var value: NSString? = ""
if scanString(str, intoString: &value),
let value = value as? String {
return value
}
return nil
}
/// Returns a string, scanned until the given string is found, or the remainder of the scanner's string. Returns `nil` if the scanner is already `atEnd`.
func scanUpToString(str: String) -> String? {
var value: NSString? = ""
if scanUpToString(str, intoString: &value),
let value = value as? String {
return value
}
return nil
}
// MARK: Numbers
/// Returns a Double if scanned, or `nil` if not found.
func scanDouble() -> Double? {
var value = 0.0
if scanDouble(&value) {
return value
}
return nil
}
/// Returns a Float if scanned, or `nil` if not found.
func scanFloat() -> Float? {
var value: Float = 0.0
if scanFloat(&value) {
return value
}
return nil
}
/// Returns an Int if scanned, or `nil` if not found.
func scanInteger() -> Int? {
var value = 0
if scanInteger(&value) {
return value
}
return nil
}
/// Returns an Int32 if scanned, or `nil` if not found.
func scanInt() -> Int32? {
var value: Int32 = 0
if scanInt(&value) {
return value
}
return nil
}
/// Returns an Int64 if scanned, or `nil` if not found.
func scanLongLong() -> Int64? {
var value: Int64 = 0
if scanLongLong(&value) {
return value
}
return nil
}
/// Returns a UInt64 if scanned, or `nil` if not found.
func scanUnsignedLongLong() -> UInt64? {
var value: UInt64 = 0
if scanUnsignedLongLong(&value) {
return value
}
return nil
}
/// Returns an NSDecimal if scanned, or `nil` if not found.
func scanDecimal() -> NSDecimal? {
var value = NSDecimal()
if scanDecimal(&value) {
return value
}
return nil
}
// MARK: Hex Numbers
/// Returns a Double if scanned in hexadecimal, or `nil` if not found.
func scanHexDouble() -> Double? {
var value = 0.0
if scanHexDouble(&value) {
return value
}
return nil
}
/// Returns a Float if scanned in hexadecimal, or `nil` if not found.
func scanHexFloat() -> Float? {
var value: Float = 0.0
if scanHexFloat(&value) {
return value
}
return nil
}
/// Returns a UInt32 if scanned in hexadecimal, or `nil` if not found.
func scanHexInt() -> UInt32? {
var value: UInt32 = 0
if scanHexInt(&value) {
return value
}
return nil
}
/// Returns a UInt64 if scanned in hexadecimal, or `nil` if not found.
func scanHexLongLong() -> UInt64? {
var value: UInt64 = 0
if scanHexLongLong(&value) {
return value
}
return nil
}
}
LJW321 commented Jan 12, 2016

///

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