mirror of
https://github.com/RevenueCat/purchases-ios
synced 2026-11-11 22:55:55 +05:45
James Borthwick
aa032028df
Adds missing user-facing error alerts, makes the error messages more readable and uses `Error` rather than `NSError` as the type to use when passing errors for presentation. resolves PWL-458
89 lines
2.5 KiB
Swift
89 lines
2.5 KiB
Swift
//
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// Copyright RevenueCat Inc. All Rights Reserved.
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//
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// Licensed under the MIT License (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://opensource.org/licenses/MIT
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//
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// EnsureNonEmptyCollectionDecodable.swift
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//
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// Created by Nacho Soto on 7/17/23.
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import Foundation
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/// A property wrapper that ensures decoded collections aren't empty.
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/// - Example:
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/// ```
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/// struct Data {
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/// @EnsureNonEmptyCollectionDecodable var values: [String] // fails to decode if array is empty
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/// @EnsureNonEmptyCollectionDecodable var dictionary: [String: String] // fails to decode if dictionary is empty
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/// }
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/// ```
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@propertyWrapper
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struct EnsureNonEmptyCollectionDecodable<Value: Collection> where Value: Codable {
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struct Error: LocalizedError {
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var path: String?
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init(codingPath: String? = nil) {
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self.path = codingPath
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}
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/// Error message explaining that the collection cannot be empty
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public var localizedDescription: String? {
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"Collection cannot be empty"
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}
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/// Error message that includes the path that contains the empty collection
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public var failureReason: String? {
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"A collection at \(path ?? "unknown") was unexpectedly empty."
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}
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}
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var wrappedValue: Value
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}
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extension EnsureNonEmptyCollectionDecodable: Equatable where Value: Equatable {}
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extension EnsureNonEmptyCollectionDecodable: Hashable where Value: Hashable {}
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extension EnsureNonEmptyCollectionDecodable: Decodable {
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init(from decoder: Decoder) throws {
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let container = try decoder.singleValueContainer()
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let array = try container.decode(Value.self)
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if array.isEmpty {
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throw Error(codingPath: "\(decoder.codingPath)")
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} else {
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self.wrappedValue = array
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}
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}
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}
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extension EnsureNonEmptyCollectionDecodable: Encodable {
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func encode(to encoder: Encoder) throws {
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var container = encoder.singleValueContainer()
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try container.encode(self.wrappedValue)
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}
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}
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extension KeyedDecodingContainer {
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func decode<T>(
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_ type: EnsureNonEmptyCollectionDecodable<T>.Type,
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forKey key: Key
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) throws -> EnsureNonEmptyCollectionDecodable<T> {
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return try self.decodeIfPresent(type, forKey: key)
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.orThrow(EnsureNonEmptyCollectionDecodable<T>.Error(codingPath: "\(self.codingPath)"))
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}
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}
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