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45 lines
1.1 KiB
Swift
45 lines
1.1 KiB
Swift
//
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// AsciiCharacter.swift
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// damus
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//
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// Created by William Casarin on 2023-07-21.
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//
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import Foundation
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struct AsciiCharacter: ExpressibleByStringLiteral, CustomStringConvertible, Equatable, Hashable {
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private let value: UInt8
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var cchar: CChar {
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return CChar(bitPattern: value)
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}
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var description: String {
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return String(UnicodeScalar(UInt8(bitPattern: cchar)))
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}
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init?(_ cchar: CChar) {
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guard cchar < 127 else { return nil }
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self.value = UInt8(cchar)
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}
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init?(_ character: Character) {
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guard let asciiValue = character.asciiValue, asciiValue < 128 else {
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return nil
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}
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self.value = asciiValue
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}
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// MARK: - ExpressibleByStringLiteral conformance
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init(stringLiteral value: StringLiteralType) {
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guard value.count == 1, let character = value.first, let ascii = AsciiCharacter(character) else {
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fatalError("Invalid ASCII character initialization.")
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}
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self = ascii
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}
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var character: Character {
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return Character(UnicodeScalar(value))
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}
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}
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