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81 lines
3.4 KiB
Swift
81 lines
3.4 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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// Errors
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//===----------------------------------------------------------------------===//
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// Both of these error types bridge to NSError, and through the entry points they use, no further work is needed to make them localized.
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extension EncodingError : LocalizedError {}
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extension DecodingError : LocalizedError {}
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//===----------------------------------------------------------------------===//
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// Error Utilities
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//===----------------------------------------------------------------------===//
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extension DecodingError {
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/// Returns a `.typeMismatch` error describing the expected type.
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///
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/// - parameter path: The path of `CodingKey`s taken to decode a value of this type.
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/// - parameter expectation: The type expected to be encountered.
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/// - parameter reality: The value that was encountered instead of the expected type.
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/// - returns: A `DecodingError` with the appropriate path and debug description.
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internal static func _typeMismatch(at path: [CodingKey], expectation: Any.Type, reality: Any) -> DecodingError {
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let description = "Expected to decode \(expectation) but found \(_typeDescription(of: reality)) instead."
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return .typeMismatch(expectation, Context(codingPath: path, debugDescription: description))
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}
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/// Returns a description of the type of `value` appropriate for an error message.
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///
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/// - parameter value: The value whose type to describe.
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/// - returns: A string describing `value`.
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/// - precondition: `value` is one of the types below.
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private static func _typeDescription(of value: Any) -> String {
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if value is NSNull {
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return "a null value"
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} else if value is NSNumber /* FIXME: If swift-corelibs-foundation isn't updated to use NSNumber, this check will be necessary: || value is Int || value is Double */ {
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return "a number"
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} else if value is String {
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return "a string/data"
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} else if value is [Any] {
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return "an array"
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} else if value is [String : Any] {
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return "a dictionary"
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} else {
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return "\(type(of: value))"
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}
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}
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}
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// Only support 64bit
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#if !(os(iOS) && (arch(i386) || arch(arm)))
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import Combine
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//===----------------------------------------------------------------------===//
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// Generic Decoding
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//===----------------------------------------------------------------------===//
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@available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
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extension JSONEncoder: TopLevelEncoder { }
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@available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
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extension PropertyListEncoder: TopLevelEncoder { }
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@available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
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extension JSONDecoder: TopLevelDecoder { }
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@available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
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extension PropertyListDecoder: TopLevelDecoder { }
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#endif /* !(os(iOS) && (arch(i386) || arch(arm))) */
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