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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2021-2022 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//
extension Unicode.Scalar {
public struct AllScalars: RandomAccessCollection {
// Unicode scalar values are in two discontiguous blocks:
// 0...0xD7FF and 0xE000...0x10FFFF
internal static var lowerSectionFirstValue: Int { 0 }
internal static var lowerSectionLastValue: Int { 0xD7FF }
internal static var upperSectionFirstValue: Int { 0xE000 }
internal static var upperSectionLastValue: Int { 0x10FFFF }
internal static var surrogateRangeCount: Int {
(upperSectionFirstValue - lowerSectionLastValue) - 1
}
internal func toContiguous(_ i: Int) -> Int {
i >= Self.upperSectionFirstValue
? i - Self.surrogateRangeCount
: i
}
internal func fromContiguous(_ i: Int) -> Int {
i > Self.lowerSectionLastValue
? i + Self.surrogateRangeCount
: i
}
public var startIndex: Int { 0 }
public var endIndex: Int { toContiguous(Self.upperSectionLastValue + 1) }
public subscript(position: Int) -> Unicode.Scalar {
Unicode.Scalar(UInt32(fromContiguous(position)))!
}
public func _customIndexOfEquatableElement(_ scalar: Unicode.Scalar) -> Int?? {
toContiguous(Int(scalar.value))
}
public func _customContainsEquatableElement(_: Unicode.Scalar) -> Bool? {
true
}
}
public static var allScalars: AllScalars {
AllScalars()
}
}
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