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import Foundation
nonisolated class DanbooruPostParser {
private struct FailableDecodable<Value: Decodable>: Decodable {
let value: Value?
init(from decoder: Decoder) throws {
let container = try decoder.singleValueContainer()
value = try? container.decode(Value.self)
}
}
private let data: Data
init(data: Data) {
self.data = data
}
func parse() -> [BooruPost] {
let decoder = JSONDecoder()
decoder.dateDecodingStrategy = .custom { decoder in
Self.parseDate(
try (try decoder.singleValueContainer()).decode(String.self)
) ?? Date()
}
do {
let decodedPosts = try decoder.decode([FailableDecodable<DanbooruPost>].self, from: data)
let validPosts = decodedPosts.compactMap(\.value)
let droppedRecordCount = decodedPosts.count - validPosts.count
if droppedRecordCount > 0 {
debugPrint(
"DanbooruPostParser.parse: dropped \(droppedRecordCount) malformed records while decoding page."
)
}
return validPosts.compactMap { post in post.toBooruPost() }
} catch {
debugPrint("DanbooruPostParser.parse: failed to decode response: \(error)")
return []
}
}
nonisolated(unsafe) private static let isoFormatter: ISO8601DateFormatter = {
let formatter = ISO8601DateFormatter()
formatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
return formatter
}()
private static let alternativeFormatter: DateFormatter = {
let formatter = DateFormatter()
formatter.dateFormat = "EEE MMM dd HH:mm:ss Z yyyy"
formatter.locale = Locale(identifier: "en_US_POSIX")
return formatter
}()
private static func parseDate(_ input: String) -> Date? {
if let date = isoFormatter.date(from: input) {
return date
}
if let date = alternativeFormatter.date(from: input) {
return date
}
if let timestamp = Double(input) {
return Date(timeIntervalSince1970: timestamp)
}
return nil
}
}
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