mirror of https://github.com/apple/pkl-swift
111 lines
4.1 KiB
Swift
111 lines
4.1 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//===----------------------------------------------------------------------===//
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import Foundation
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final class _MessagePackDecoder: Decoder {
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var codingPath: [CodingKey] = []
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var userInfo: [CodingUserInfoKey: Any] = [:]
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var value: MessagePackValue
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init(value: MessagePackValue) {
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self.value = value
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}
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func container<Key>(keyedBy type: Key.Type) throws -> KeyedDecodingContainer<Key>
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where Key: CodingKey {
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switch self.value {
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case .map(let map):
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let container = _MessagePackDecoder.KeyedContainer<Key>(
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value: map, codingPath: self.codingPath, userInfo: self.userInfo
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)
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return KeyedDecodingContainer(container)
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case .int:
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let container = _MessagePackDecoder.KeyedSingleContainer<Key>(
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value: self.value, codingPath: self.codingPath, userInfo: self.userInfo
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)
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return KeyedDecodingContainer(container)
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default:
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throw DecodingError.typeMismatch(
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[(MessagePackValue, MessagePackValue)].self,
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DecodingError.Context(
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codingPath: self.codingPath,
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debugDescription:
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"Expected to decode \([(MessagePackValue, MessagePackValue)].self), but found \(self.value.debugDataTypeDescription) instead"
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)
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)
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}
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}
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func unkeyedContainer() throws -> UnkeyedDecodingContainer {
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switch self.value {
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case .array(let values):
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return UnkeyedContainer(
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value: values, codingPath: self.codingPath, userInfo: self.userInfo
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)
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// case .map(let values):
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// return UnkeyedContainerForMaps(
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// value: values, codingPath: codingPath, userInfo: userInfo
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// )
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case .map(let values):
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return MapUnkeyedContainer(
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value: values, codingPath: self.codingPath, userInfo: self.userInfo
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)
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default:
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let context = DecodingError.Context(
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codingPath: self.codingPath,
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debugDescription:
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"Expected to decode \([(MessagePackValue, MessagePackValue)].self), but got \(self.value.debugDataTypeDescription)"
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)
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throw DecodingError.typeMismatch([(MessagePackValue, MessagePackValue)].self, context)
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}
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}
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func singleValueContainer() -> SingleValueDecodingContainer {
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SingleValueContainer(value: self.value, codingPath: self.codingPath, userInfo: self.userInfo)
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}
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}
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protocol MessagePackDecodingContainer: AnyObject {
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var codingPath: [CodingKey] { get set }
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var userInfo: [CodingUserInfoKey: Any] { get }
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}
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extension MessagePackValue {
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func decodeInto<T>(_ typ: T.Type) throws -> T where T: Decodable {
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let decoder = _MessagePackDecoder(value: self)
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switch typ {
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case is Data.Type:
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let box = try Box<Data>(from: decoder)
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return box.value as! T
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case is Date.Type:
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let box = try Box<Date>(from: decoder)
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return box.value as! T
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case is [UInt8].Type:
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let box = try Box<[UInt8]>(from: decoder)
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return box.value as! T
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case is URL.Type:
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let box = try Box<URL>(from: decoder)
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return box.value as! T
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default:
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return try T(from: decoder)
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}
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}
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}
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