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41d9c2cc59
The SDK directory is now confusing as the Windows target also has a SDK overlay. In order to make this more uniform, move the SDK directory to Darwin which covers the fact that this covers the XNU family of OSes. The Windows directory contains the SDK overlay for the Windows target.
58 lines
2.7 KiB
Swift
58 lines
2.7 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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fileprivate 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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