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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Collections open source project
//
// Copyright (c) 2022 - 2024 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 UInt8 {
@inline(__always)
internal static var _ascii0: Self { 48 }
@inline(__always)
internal static var _ascii1: Self { 49 }
@inline(__always)
internal static var _asciiLT: Self { 60 }
@inline(__always)
internal static var _asciiGT: Self { 62 }
}
extension BitArray: CustomStringConvertible {
/// A textual representation of this instance.
/// Bit arrays print themselves as a string of binary bits, with the
/// highest-indexed elements appearing first, as in the binary representation
/// of integers. The digits are surrounded by angle brackets, so that the
/// notation is non-ambigous even for empty bit arrays:
///
/// let bits: BitArray = [false, false, false, true, true]
/// print(bits) // "<11000>"
///
/// let empty = BitArray()
/// print(empty) // "<>"
public var description: String {
_bitString
}
}
extension BitArray: CustomDebugStringConvertible {
/// A textual representation of this instance.
/// Bit arrays print themselves as a string of binary bits, with the
/// highest-indexed elements appearing first, as in the binary representation
/// of integers:
///
/// let bits: BitArray = [false, false, false, true, true]
/// print(bits) // "<11000>"
///
/// The digits are surrounded by angle brackets to serve as visual delimiters.
/// (So that empty bit arrays still have a non-empty description.)
public var debugDescription: String {
description
}
}
extension BitArray {
internal var _bitString: String {
guard !isEmpty else { return "<>" }
var result: String
if #available(macOS 11.0, iOS 14.0, watchOS 7.0, tvOS 14.0, *) {
result = String(unsafeUninitializedCapacity: self.count + 2) { target in
target.initializeElement(at: count + 1, to: ._asciiGT)
var i = count
for v in self {
target.initializeElement(at: i, to: v ? ._ascii1 : ._ascii0)
i &-= 1
}
assert(i == 0)
target.initializeElement(at: 0, to: ._asciiLT)
return count + 2
}
} else {
result = "<"
result.reserveCapacity(self.count + 2)
for v in self.reversed() {
result.append(v ? "1" : "0")
}
result.append(">")
}
return result
}
}
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