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XMLUnkeyedDecodingContainer.swift
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XMLUnkeyedDecodingContainer.swift
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//
// XMLUnkeyedDecodingContainer.swift
// XMLCoder
//
// Created by Shawn Moore on 11/21/17.
// Copyright © 2017 Shawn Moore. All rights reserved.
//
import Foundation
struct _XMLUnkeyedDecodingContainer: UnkeyedDecodingContainer {
// MARK: Properties
/// A reference to the decoder we're reading from.
private let decoder: _XMLDecoder
/// A reference to the container we're reading from.
private let container: UnkeyedBox
/// The path of coding keys taken to get to this point in decoding.
public private(set) var codingPath: [CodingKey]
/// The index of the element we're about to decode.
public private(set) var currentIndex: Int
// MARK: - Initialization
/// Initializes `self` by referencing the given decoder and container.
init(referencing decoder: _XMLDecoder, wrapping container: UnkeyedBox) {
self.decoder = decoder
self.container = container
codingPath = decoder.codingPath
currentIndex = 0
}
// MARK: - UnkeyedDecodingContainer Methods
public var count: Int? {
return container.count
}
public var isAtEnd: Bool {
return currentIndex >= count!
}
public mutating func decodeNil() throws -> Bool {
guard !isAtEnd else {
throw DecodingError.valueNotFound(Any?.self, DecodingError.Context(
codingPath: decoder.codingPath + [_XMLKey(index: self.currentIndex)],
debugDescription: "Unkeyed container is at end."
))
}
if container[self.currentIndex].isNull {
currentIndex += 1
return true
} else {
return false
}
}
public mutating func decode(_ type: Bool.Type) throws -> Bool {
return try decode(type) { decoder, box in
try decoder.unbox(box)
}
}
public mutating func decode(_ type: Int.Type) throws -> Int {
return try decodeSignedInteger(type)
}
public mutating func decode(_ type: Int8.Type) throws -> Int8 {
return try decodeSignedInteger(type)
}
public mutating func decode(_ type: Int16.Type) throws -> Int16 {
return try decodeSignedInteger(type)
}
public mutating func decode(_ type: Int32.Type) throws -> Int32 {
return try decodeSignedInteger(type)
}
public mutating func decode(_ type: Int64.Type) throws -> Int64 {
return try decodeSignedInteger(type)
}
public mutating func decode(_ type: UInt.Type) throws -> UInt {
return try decodeUnsignedInteger(type)
}
public mutating func decode(_ type: UInt8.Type) throws -> UInt8 {
return try decodeUnsignedInteger(type)
}
public mutating func decode(_ type: UInt16.Type) throws -> UInt16 {
return try decodeUnsignedInteger(type)
}
public mutating func decode(_ type: UInt32.Type) throws -> UInt32 {
return try decodeUnsignedInteger(type)
}
public mutating func decode(_ type: UInt64.Type) throws -> UInt64 {
return try decodeUnsignedInteger(type)
}
public mutating func decode(_ type: Float.Type) throws -> Float {
return try decodeFloatingPoint(type)
}
public mutating func decode(_ type: Double.Type) throws -> Double {
return try decodeFloatingPoint(type)
}
public mutating func decode(_ type: String.Type) throws -> String {
return try decode(type) { decoder, box in
try decoder.unbox(box)
}
}
public mutating func decode<T: Decodable>(_ type: T.Type) throws -> T {
return try decode(type) { decoder, box in
try decoder.unbox(box)
}
}
private mutating func decodeSignedInteger<T>(_ type: T.Type) throws -> T
where T: BinaryInteger & SignedInteger & Decodable {
return try decode(type) { decoder, box in
try decoder.unbox(box)
}
}
private mutating func decodeUnsignedInteger<T>(_ type: T.Type) throws -> T
where T: BinaryInteger & UnsignedInteger & Decodable {
return try decode(type) { decoder, box in
try decoder.unbox(box)
}
}
private mutating func decodeFloatingPoint<T>(_ type: T.Type) throws -> T
where T: BinaryFloatingPoint & Decodable {
return try decode(type) { decoder, box in
try decoder.unbox(box)
}
}
private mutating func decode<T: Decodable>(
_ type: T.Type,
decode: (_XMLDecoder, Box) throws -> T?
) throws -> T {
guard !isAtEnd else {
throw DecodingError.valueNotFound(type, DecodingError.Context(
codingPath: decoder.codingPath + [_XMLKey(index: self.currentIndex)],
debugDescription: "Unkeyed container is at end."
))
}
decoder.codingPath.append(_XMLKey(index: currentIndex))
defer { self.decoder.codingPath.removeLast() }
let box: Box
// work around unkeyed box wrapped as single element of keyed box
if let type = type as? AnyArray.Type,
let keyedBox = container[self.currentIndex] as? KeyedBox,
keyedBox.attributes.count == 0,
keyedBox.elements.count == 1,
let firstKey = keyedBox.elements.keys.first,
let unkeyedBox = keyedBox.elements[firstKey] {
box = unkeyedBox
} else {
box = container[self.currentIndex]
}
let value = try decode(decoder, box)
defer { currentIndex += 1 }
if value == nil, let type = type as? AnyOptional.Type {
return type.init() as! T
}
guard let decoded: T = value else {
throw DecodingError.valueNotFound(type, DecodingError.Context(
codingPath: decoder.codingPath + [_XMLKey(index: self.currentIndex)],
debugDescription: "Expected \(type) but found null instead."
))
}
return decoded
}
public mutating func nestedContainer<NestedKey>(
keyedBy _: NestedKey.Type
) throws -> KeyedDecodingContainer<NestedKey> {
decoder.codingPath.append(_XMLKey(index: currentIndex))
defer { self.decoder.codingPath.removeLast() }
guard !isAtEnd else {
throw DecodingError.valueNotFound(
KeyedDecodingContainer<NestedKey>.self, DecodingError.Context(
codingPath: codingPath,
debugDescription: "Cannot get nested keyed container -- unkeyed container is at end."
)
)
}
let value = self.container[self.currentIndex]
guard !value.isNull else {
throw DecodingError.valueNotFound(KeyedDecodingContainer<NestedKey>.self, DecodingError.Context(
codingPath: codingPath,
debugDescription: "Cannot get keyed decoding container -- found null value instead."
))
}
guard let keyed = value as? KeyedBox else {
throw DecodingError._typeMismatch(at: codingPath,
expectation: [String: Any].self,
reality: value)
}
currentIndex += 1
let container = _XMLKeyedDecodingContainer<NestedKey>(
referencing: decoder,
wrapping: keyed
)
return KeyedDecodingContainer(container)
}
public mutating func nestedUnkeyedContainer() throws -> UnkeyedDecodingContainer {
decoder.codingPath.append(_XMLKey(index: currentIndex))
defer { self.decoder.codingPath.removeLast() }
guard !isAtEnd else {
throw DecodingError.valueNotFound(
UnkeyedDecodingContainer.self, DecodingError.Context(
codingPath: codingPath,
debugDescription: "Cannot get nested keyed container -- unkeyed container is at end."
)
)
}
let value = container[self.currentIndex]
guard !value.isNull else {
throw DecodingError.valueNotFound(UnkeyedDecodingContainer.self, DecodingError.Context(
codingPath: codingPath,
debugDescription: "Cannot get keyed decoding container -- found null value instead."
))
}
guard let unkeyed = value as? UnkeyedBox else {
throw DecodingError._typeMismatch(at: codingPath,
expectation: UnkeyedBox.self,
reality: value)
}
currentIndex += 1
return _XMLUnkeyedDecodingContainer(referencing: decoder, wrapping: unkeyed)
}
public mutating func superDecoder() throws -> Decoder {
decoder.codingPath.append(_XMLKey(index: currentIndex))
defer { self.decoder.codingPath.removeLast() }
guard !isAtEnd else {
throw DecodingError.valueNotFound(Decoder.self, DecodingError.Context(
codingPath: codingPath,
debugDescription: "Cannot get superDecoder() -- unkeyed container is at end."
))
}
let value = container[self.currentIndex]
currentIndex += 1
return _XMLDecoder(referencing: value,
at: decoder.codingPath,
options: decoder.options)
}
}