mirror of
https://github.com/firebase/firebase-ios-sdk
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97 lines
3.1 KiB
Swift
97 lines
3.1 KiB
Swift
// Copyright 2024 Google LLC
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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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// http://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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import Foundation
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/// A collection of name-value pairs representing a JSON object.
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///
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/// This may be decoded from, or encoded to, a
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/// [`google.protobuf.Struct`](https://protobuf.dev/reference/protobuf/google.protobuf/#struct).
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public typealias JSONObject = [String: JSONValue]
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/// Represents a value in one of JSON's data types.
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///
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/// This may be decoded from, or encoded to, a
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/// [`google.protobuf.Value`](https://protobuf.dev/reference/protobuf/google.protobuf/#value).
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public enum JSONValue {
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/// A `null` value.
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case null
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/// A numeric value.
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case number(Double)
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/// A string value.
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case string(String)
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/// A boolean value.
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case bool(Bool)
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/// A JSON object.
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case object(JSONObject)
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/// An array of `JSONValue`s.
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case array([JSONValue])
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}
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extension JSONValue: Decodable {
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public init(from decoder: Decoder) throws {
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let container = try decoder.singleValueContainer()
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if container.decodeNil() {
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self = .null
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} else if let numberValue = try? container.decode(Double.self) {
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self = .number(numberValue)
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} else if let stringValue = try? container.decode(String.self) {
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self = .string(stringValue)
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} else if let boolValue = try? container.decode(Bool.self) {
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self = .bool(boolValue)
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} else if let objectValue = try? container.decode(JSONObject.self) {
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self = .object(objectValue)
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} else if let arrayValue = try? container.decode([JSONValue].self) {
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self = .array(arrayValue)
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} else {
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throw DecodingError.dataCorruptedError(
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in: container,
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debugDescription: "Failed to decode JSON value."
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)
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}
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}
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}
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extension JSONValue: Encodable {
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public func encode(to encoder: Encoder) throws {
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var container = encoder.singleValueContainer()
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switch self {
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case .null:
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try container.encodeNil()
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case let .number(numberValue):
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// Convert to `Decimal` before encoding for consistent floating-point serialization across
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// platforms. E.g., `Double` serializes 3.14159 as 3.1415899999999999 in some cases and
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// 3.14159 in others. See
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// https://forums.swift.org/t/jsonencoder-encodable-floating-point-rounding-error/41390/4 for
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// more details.
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try container.encode(Decimal(numberValue))
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case let .string(stringValue):
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try container.encode(stringValue)
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case let .bool(boolValue):
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try container.encode(boolValue)
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case let .object(objectValue):
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try container.encode(objectValue)
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case let .array(arrayValue):
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try container.encode(arrayValue)
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}
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}
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}
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extension JSONValue: Equatable {}
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