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import Foundation | |
// Inspired by https://gist.github.com/mbuchetics/c9bc6c22033014aa0c550d3b4324411a | |
struct JSONCodingKeys: CodingKey { | |
var stringValue: String | |
init?(stringValue: String) { | |
self.stringValue = stringValue | |
} | |
var intValue: Int? | |
init?(intValue: Int) { | |
self.init(stringValue: "\(intValue)") | |
self.intValue = intValue | |
} | |
} | |
extension KeyedDecodingContainer { | |
func decode(_ type: Dictionary<String, Any>.Type, forKey key: K) throws -> Dictionary<String, Any> { | |
let container = try self.nestedContainer(keyedBy: JSONCodingKeys.self, forKey: key) | |
return try container.decode(type) | |
} | |
func decodeIfPresent(_ type: Dictionary<String, Any>.Type, forKey key: K) throws -> Dictionary<String, Any>? { | |
guard contains(key) else { | |
return nil | |
} | |
return try decode(type, forKey: key) | |
} | |
func decode(_ type: Array<Any>.Type, forKey key: K) throws -> Array<Any> { | |
var container = try self.nestedUnkeyedContainer(forKey: key) | |
return try container.decode(type) | |
} | |
func decodeIfPresent(_ type: Array<Any>.Type, forKey key: K) throws -> Array<Any>? { | |
guard contains(key) else { | |
return nil | |
} | |
return try decode(type, forKey: key) | |
} | |
func decode(_ type: Dictionary<String, Any>.Type) throws -> Dictionary<String, Any> { | |
var dictionary = Dictionary<String, Any>() | |
for key in allKeys { | |
if let if let boolValue = try? decode(Bool.self, forKey: key) { | |
dictionary[key.stringValue] = boolValue | |
} else if let stringValue = try? decode(String.self, forKey: key) { | |
dictionary[key.stringValue] = stringValue | |
} else intValue = try? decode(Int.self, forKey: key) { | |
dictionary[key.stringValue] = intValue | |
} else if let doubleValue = try? decode(Double.self, forKey: key) { | |
dictionary[key.stringValue] = doubleValue | |
} else if let fileMetaData = try? decode(Asset.FileMetadata.self, forKey: key) { | |
dictionary[key.stringValue] = fileMetaData // Custom contentful type. | |
} else if let nestedDictionary = try? decode(Dictionary<String, Any>.self, forKey: key) { | |
dictionary[key.stringValue] = nestedDictionary | |
} else if let nestedArray = try? decode(Array<Any>.self, forKey: key) { | |
dictionary[key.stringValue] = nestedArray | |
} | |
} | |
return dictionary | |
} | |
} | |
extension UnkeyedDecodingContainer { | |
mutating func decode(_ type: Array<Any>.Type) throws -> Array<Any> { | |
var array: [Any] = [] | |
while isAtEnd == false { | |
if let value = try? decode(Bool.self) { | |
array.append(value) | |
} else if let value = try? decode(Double.self) { | |
array.append(value) | |
} else if let value = try? decode(String.self) { | |
array.append(value) | |
} else if let nestedDictionary = try? decode(Dictionary<String, Any>.self) { | |
array.append(nestedDictionary) | |
} else if let nestedArray = try? decode(Array<Any>.self) { | |
array.append(nestedArray) | |
} | |
} | |
return array | |
} | |
mutating func decode(_ type: Dictionary<String, Any>.Type) throws -> Dictionary<String, Any> { | |
let nestedContainer = try self.nestedContainer(keyedBy: JSONCodingKeys.self) | |
return try nestedContainer.decode(type) | |
} | |
} |
Correcting the above link from @sakrist: https://github.com/3D4Medical/glTFSceneKit/blob/master/Sources/glTFSceneKit/GLTF/JSONCodingKeys.swift
@loudmouth
Few mistakes:
if let if let boolValue
->if let boolValue
} else intValue
->} else if let intValue
One more check to see if the value of the key is null then return nil
func decodeIfPresent(_ type: Dictionary<String, Any>.Type, forKey key: K) throws -> Dictionary<String, Any>? {
guard contains(key) else {
return nil
}
guard try decodeNil(forKey: key) else {
return nil
}
return try decode(type, forKey: key)
}
dude! you save my time
Thanks for this code!
One of our API's returned an array where one of the values was 'null', which got the [Any] decoder into an infinite loop.
Fixed it this way:
mutating func decode(_ type: Array<Any>.Type) throws -> Array<Any> {
var array: [Any] = []
while isAtEnd == false {
// When one of the values is `null`, we seem to enter an infinite loop.. Check if the value is null and continue if so
do {
let value: String? = try decode(String?.self)
if value == nil {
// Found a nil value... skip the rest of this function and continue with the next value
continue
}
} catch {
// if we fail, it isn't a String? and isn't nil
// continue with testing values
}
if let value = try? decode(Bool.self) {
array.append(value)
} else if let value = try? decode(Int.self) {
array.append(value)
} else if let value = try? decode(Double.self) {
array.append(value)
} else if let value = try? decode(String.self) {
array.append(value)
} else if let nestedDictionary = try? decode(JSON.self) {
array.append(nestedDictionary)
} else if let nestedArray = try? decode(Array<Any>.self) {
array.append(nestedArray)
}
}
return array
}
@ChiellieNL thanks for sharing that fix! I had to replace the line with JSON.self
to the original line to get it to compile on my end.
Here is my version with decoding (original post), encoding (thank you @sakrist!) and the null fix from above. I also changed the types to the modern syntax of [Any]
instead of Array<Any>
, and [String: Any]
instead of Dictionary<String, Any>
.
https://gist.github.com/mikebuss/17142624da4baf9cdcc337861e256533
@converted2mac I guess Github doesn't give notifications for comments on Gists 🤔
Anyway, no license, i'd say go ahead and use the code as you need ;-)
@mikebuss null
value should be appended to the array as well. There were a couple of bugs including 2 infinite loops for encoding/decoding [Any]. I've created a new version that works well with all cases and fixed all the bugs that I found.
https://gist.github.com/sukov/d3834c0e7b72e4f7575f753b352f6ddd
Thanks for sharing this! I really need it :)
Thanks for this. I think if you renamed the gist to end in .swift
instead of [space]Swift
syntax highlighting will be added.
Thanks for sharing this 👍
Is this supposed to be able to decode a struct with an [Any] parameter automatically? Or we need to manually decode it?
I'm pondering... would this GIST code help me to decode the JSON from Alpha Vantage's TimeSeriesDaily?
https://www.alphavantage.co/query?function=TIME_SERIES_DAILY&symbol=IBM&apikey=demo
Which has this JSON:
`{
"Meta Data": {
"1. Information": "Daily Prices (open, high, low, close) and Volumes",
"2. Symbol": "IBM",
"3. Last Refreshed": "2022-07-01",
"4. Output Size": "Compact",
"5. Time Zone": "US/Eastern"
},
"Time Series (Daily)": {
"2022-07-01": {
"1. open": "141.0000",
"2. high": "141.6700",
"3. low": "139.2600",
"4. close": "141.1200",
"5. volume": "4012106"
},
"2022-06-30": {
"1. open": "139.5800",
"2. high": "142.4600",
"3. low": "139.2800",
"4. close": "141.1900",
"5. volume": "4878020"
},
....
"2022-02-08": {
"1. open": "137.2300",
"2. high": "137.5200",
"3. low": "135.7800",
"4. close": "137.0200",
"5. volume": "4181825"
}
}
}
I'm wondering how to use the code... How do I specify the Dictionary of some number of Daily Dictionaries, for the JSON parsers?
struct Result: Codable {
let metaData: MetaData
let timeSeriesDaily: TimeSeriesDaily
private enum CodingKeys: String, CodingKey {
case metaData = "Meta Data"
case timeSeriesDaily = "Time Series (Daily)"
}
}
struct DailyTimeSeries: Codable { // use CoadableExtension for Dictionary [String: Any]
let daily: [String: DailyQuote]
}
I've banged my head on this a lot over the last few weeks. Finally a solution:
struct Daily: Codable {
let open: String
let high: String
let low: String
let close: String
let volume: String
private enum CodingKeys: String, CodingKey {
case open = "1. open"
case high = "2. high"
case low = "3. low"
case close = "4. close"
case volume = "5. volume"
}
}
struct MetaData: Codable {
let information: String
let symbol: String
let lastRefreshed: String
let outputSize: String
let timeZone: String
private enum CodingKeys: String, CodingKey {
case information = "1. Information"
case symbol = "2. Symbol"
case lastRefreshed = "3. Last Refreshed"
case outputSize = "4. Output Size"
case timeZone = "5. Time Zone"
}
}
struct Result: Codable {
let metaData: MetaData
let timeSeriesDaily: [String:Daily]
private enum CodingKeys: String, CodingKey {
case metaData = "Meta Data"
case timeSeriesDaily = "Time Series (Daily)"
}
}
@loudmouth thank you so much for sharing!
I've added encoder
https://github.com/3D4Medical/gltf_scenekit/blob/master/Sources/gltf_scenekit/GLTF/JSONCodingKeys.swift