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Merge pull request #2 from christophhagen/1-add-oneof-protobuf-compat…
…ibility Add Oneof Protobuf Compatibility
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70 changes: 70 additions & 0 deletions
70
Sources/BinaryCodable/Decoding/Protobuf/OneOf/OneOfAssociatedValuesDecoder.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| import Foundation | ||
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| /** | ||
| A keyed decoder specifically to decode the associated value within a `ProtobufOneOf` type. | ||
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| The decoder receives the data associated with the enum case from `OneOfKeyedDecoder`, | ||
| and allows exactly one associated value key (`_0`) to be decoded from the data. | ||
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| The decoder allows only one call to `decode(_:forKey:)`, all other access will fail. | ||
| */ | ||
| final class OneOfAssociatedValuesDecoder<Key>: AbstractDecodingNode, KeyedDecodingContainerProtocol where Key: CodingKey { | ||
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| private let data: Data | ||
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| init(data: Data, path: [CodingKey], info: UserInfo) { | ||
| self.data = data | ||
| super.init(path: path, info: info) | ||
| } | ||
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| var allKeys: [Key] { | ||
| [Key(stringValue: "_0")!] | ||
| } | ||
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| func contains(_ key: Key) -> Bool { | ||
| return true | ||
| } | ||
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| func decodeNil(forKey key: Key) throws -> Bool { | ||
| throw ProtobufDecodingError.invalidAccess( | ||
| "Unexpected call to `decodeNil(forKey:)` while decoding associated value for a `ProtobufOneOf` type") | ||
| } | ||
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| func decode<T>(_ type: T.Type, forKey key: Key) throws -> T where T : Decodable { | ||
| if let _ = type as? DecodablePrimitive.Type { | ||
| if let ProtoType = type as? ProtobufDecodable.Type { | ||
| if !data.isEmpty { | ||
| return try ProtoType.init(fromProtobuf: data) as! T | ||
| } else { | ||
| return ProtoType.zero as! T | ||
| } | ||
| } | ||
| throw ProtobufDecodingError.unsupported(type: type) | ||
| } else if type is AnyDictionary.Type { | ||
| let node = ProtoDictDecodingNode(data: data, path: codingPath, info: userInfo) | ||
| return try T.init(from: node) | ||
| } | ||
| let node = ProtoDecodingNode(data: data, path: codingPath, info: userInfo) | ||
| return try T.init(from: node) | ||
| } | ||
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| func nestedContainer<NestedKey>(keyedBy type: NestedKey.Type, forKey key: Key) throws -> KeyedDecodingContainer<NestedKey> where NestedKey : CodingKey { | ||
| throw ProtobufDecodingError.invalidAccess( | ||
| "Unexpected call to `nestedContainer(keyedBy:forKey:)` while decoding associated value for a `ProtobufOneOf` type") | ||
| } | ||
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| func nestedUnkeyedContainer(forKey key: Key) throws -> UnkeyedDecodingContainer { | ||
| throw ProtobufDecodingError.invalidAccess( | ||
| "Unexpected call to `nestedUnkeyedContainer(forKey:)` while decoding associated value for a `ProtobufOneOf` type") | ||
| } | ||
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| func superDecoder() throws -> Decoder { | ||
| throw ProtobufDecodingError.invalidAccess( | ||
| "Unexpected call to `superDecoder()` while decoding associated value for a `ProtobufOneOf` type") | ||
| } | ||
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| func superDecoder(forKey key: Key) throws -> Decoder { | ||
| throw ProtobufDecodingError.invalidAccess( | ||
| "Unexpected call to `superDecoder(forKey:)` while decoding associated value for a `ProtobufOneOf` type") | ||
| } | ||
| } |
36 changes: 36 additions & 0 deletions
36
Sources/BinaryCodable/Decoding/Protobuf/OneOf/OneOfDecodingNode.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| import Foundation | ||
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| typealias KeyedDataCallback = ((CodingKey) -> Data?) | ||
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| /** | ||
| A decoding node specifically to decode protobuf `OneOf` structures. | ||
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| The node receives all data from the parent container, and hands it to a `OneOfKeyedDecoder`, | ||
| which then decodes the keyed values within the enum. | ||
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| Attempts to access other containers (`keyed` or `single`) will throw an error. | ||
| */ | ||
| final class OneOfDecodingNode: AbstractDecodingNode, Decoder { | ||
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| private let content: [DecodingKey: Data] | ||
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| init(content: [DecodingKey: Data], path: [CodingKey], info: UserInfo) { | ||
| self.content = content | ||
| super.init(path: path, info: info) | ||
| } | ||
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| func container<Key>(keyedBy type: Key.Type) throws -> KeyedDecodingContainer<Key> where Key : CodingKey { | ||
| let container = OneOfKeyedDecoder<Key>(content: content, path: codingPath, info: userInfo) | ||
| return KeyedDecodingContainer(container) | ||
| } | ||
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| func unkeyedContainer() throws -> UnkeyedDecodingContainer { | ||
| throw ProtobufDecodingError.invalidAccess( | ||
| "Attempt to access unkeyedContainer() for a type conforming to ProtobufOneOf") | ||
| } | ||
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| func singleValueContainer() throws -> SingleValueDecodingContainer { | ||
| throw ProtobufDecodingError.invalidAccess( | ||
| "Attempt to access singleValueContainer() for a type conforming to ProtobufOneOf") | ||
| } | ||
| } |
66 changes: 66 additions & 0 deletions
66
Sources/BinaryCodable/Decoding/Protobuf/OneOf/OneOfKeyedDecoder.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| import Foundation | ||
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| /** | ||
| A keyed decoder specifically to decode an enum of type `ProtobufOneOf`. | ||
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| The decoder only allows a call to `nestedContainer(keyedBy:forKey:)` | ||
| to decode the associated value of the `OneOf`, all other access will fail with an error. | ||
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| The decoder receives all key-value pairs from the parent node (passed through `OneOfDecodingNode`), | ||
| in order to select the appropriate data required to decode the enum (`OneOf` types share the field values with the enclosing message). | ||
| */ | ||
| final class OneOfKeyedDecoder<Key>: AbstractDecodingNode, KeyedDecodingContainerProtocol where Key: CodingKey { | ||
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| private let content: [DecodingKey: Data] | ||
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| init(content: [DecodingKey: Data], path: [CodingKey], info: UserInfo) { | ||
| self.content = content | ||
| super.init(path: path, info: info) | ||
| } | ||
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| var allKeys: [Key] { | ||
| content.keys.compactMap { key in | ||
| switch key { | ||
| case .intKey(let value): | ||
| return Key(intValue: value) | ||
| case .stringKey(let value): | ||
| return Key(stringValue: value) | ||
| } | ||
| } | ||
| } | ||
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| func contains(_ key: Key) -> Bool { | ||
| content.keys.contains { $0.isEqual(to: key) } | ||
| } | ||
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| func decodeNil(forKey key: Key) throws -> Bool { | ||
| throw ProtobufDecodingError.invalidAccess( | ||
| "Unexpected call to `decodeNil(forKey:)` while decoding `ProtobufOneOf` enum") | ||
| } | ||
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| func decode<T>(_ type: T.Type, forKey key: Key) throws -> T where T : Decodable { | ||
| throw ProtobufDecodingError.invalidAccess( | ||
| "Unexpected call to `decode(_,forKey)` while decoding `ProtobufOneOf` enum") | ||
| } | ||
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| func nestedContainer<NestedKey>(keyedBy type: NestedKey.Type, forKey key: Key) throws -> KeyedDecodingContainer<NestedKey> where NestedKey : CodingKey { | ||
| let data = content.first(where: { $0.key.isEqual(to: key) })?.value ?? Data() | ||
| let container = OneOfAssociatedValuesDecoder<NestedKey>(data: data, path: codingPath, info: userInfo) | ||
| return KeyedDecodingContainer(container) | ||
| } | ||
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| func nestedUnkeyedContainer(forKey key: Key) throws -> UnkeyedDecodingContainer { | ||
| throw ProtobufDecodingError.invalidAccess( | ||
| "Unexpected call to `nestedUnkeyedContainer(forKey:)` while decoding `ProtobufOneOf` enum") | ||
| } | ||
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| func superDecoder() throws -> Decoder { | ||
| throw ProtobufDecodingError.invalidAccess( | ||
| "Unexpected call to `superDecoder()` while decoding `ProtobufOneOf` enum") | ||
| } | ||
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| func superDecoder(forKey key: Key) throws -> Decoder { | ||
| throw ProtobufDecodingError.invalidAccess( | ||
| "Unexpected call to `superDecoder(forKey:)` while decoding `ProtobufOneOf` enum") | ||
| } | ||
| } |
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