forked from apple/swift
/
UnicodeLatin1.swift
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/
UnicodeLatin1.swift
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//===--- UnicodeLatin1.swift ----------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2020 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
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
@available(macOS 9999, iOS 9999, tvOS 9999, watchOS 9999, *)
extension Unicode {
@frozen
public enum Latin1 {}
}
@available(macOS 9999, iOS 9999, tvOS 9999, watchOS 9999, *)
extension Unicode.Latin1: Unicode.Encoding {
@frozen
public struct Parser {
@inlinable
public init() {}
}
public typealias CodeUnit = UInt8
public typealias EncodedScalar = CollectionOfOne<CodeUnit>
public typealias ForwardParser = Parser
public typealias ReverseParser = Parser
@inlinable
public static var encodedReplacementCharacter: EncodedScalar {
EncodedScalar(0x1A) // U+001A SUBSTITUTE
}
@inlinable
public static func decode(_ encodedScalar: EncodedScalar) -> Unicode.Scalar {
Unicode.Scalar(encodedScalar[0])
}
@inlinable
public static func encode(_ unicodeScalar: Unicode.Scalar) -> EncodedScalar? {
CodeUnit(exactly: unicodeScalar.value).map { EncodedScalar($0) }
}
@inlinable
public static func _isScalar(_: CodeUnit) -> Bool { true }
}
@available(macOS 9999, iOS 9999, tvOS 9999, watchOS 9999, *)
extension Unicode.Latin1.Parser: Unicode.Parser {
public typealias Encoding = Unicode.Latin1
@inlinable
public mutating func parseScalar<I: IteratorProtocol>(
from codeUnits: inout I
) -> Unicode.ParseResult<Encoding.EncodedScalar>
where I.Element == Encoding.CodeUnit {
codeUnits.next().map { .valid(Encoding.EncodedScalar($0)) } ?? .emptyInput
}
}