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@EnsureNonEmptyArrayDecodable (#2831)
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| // | ||
| // Copyright RevenueCat Inc. All Rights Reserved. | ||
| // | ||
| // Licensed under the MIT License (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // https://opensource.org/licenses/MIT | ||
| // | ||
| // EnsureNonEmptyArrayDecodable.swift | ||
| // | ||
| // Created by Nacho Soto on 7/17/23. | ||
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| import Foundation | ||
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| /// A property wrapper that ensures decoded arrays aren't empty. | ||
| /// - Example: | ||
| /// ``` | ||
| /// struct Data { | ||
| /// @EnsureNonEmptyArrayDecodable var values: [String] // fails to decode if array is empty | ||
| /// } | ||
| /// ``` | ||
| @propertyWrapper | ||
| struct EnsureNonEmptyArrayDecodable<Value: Codable> { | ||
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| struct Error: Swift.Error {} | ||
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| var wrappedValue: [Value] | ||
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| } | ||
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| extension EnsureNonEmptyArrayDecodable: Equatable where Value: Equatable {} | ||
| extension EnsureNonEmptyArrayDecodable: Hashable where Value: Hashable {} | ||
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| extension EnsureNonEmptyArrayDecodable: Decodable { | ||
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| init(from decoder: Decoder) throws { | ||
| let container = try decoder.singleValueContainer() | ||
| let array = try container.decode([Value].self) | ||
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| if array.isEmpty { | ||
| throw Error() | ||
| } else { | ||
| self.wrappedValue = array | ||
| } | ||
| } | ||
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| } | ||
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| extension EnsureNonEmptyArrayDecodable: Encodable { | ||
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| func encode(to encoder: Encoder) throws { | ||
| var container = encoder.singleValueContainer() | ||
| try container.encode(self.wrappedValue) | ||
| } | ||
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| } | ||
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| extension KeyedDecodingContainer { | ||
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| func decode<T>( | ||
| _ type: EnsureNonEmptyArrayDecodable<T>.Type, | ||
| forKey key: Key | ||
| ) throws -> EnsureNonEmptyArrayDecodable<T> { | ||
| return try self.decodeIfPresent(type, forKey: key) | ||
| .orThrow(EnsureNonEmptyArrayDecodable<T>.Error()) | ||
| } | ||
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| } |
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