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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)
}
}
@haashem

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@haashem haashem commented Nov 21, 2017

change decoder to check for bool at first. because true will be decoded to int 1, so check for bool will drop

@loudmouth

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@loudmouth loudmouth commented Nov 24, 2017

@hashemp206 done, good catch ;-)

@converted2mac

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@converted2mac converted2mac commented Jan 10, 2018

@loudmouth, did you have a license in mind for this gist? Looks just like the kind of thing I've been looking for, to work with my Codable stuff for JSON parsing...

Good work!

@schlingding

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@OlesenkoViktor

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@OlesenkoViktor OlesenkoViktor commented Aug 23, 2018

@loudmouth
Few mistakes:

  • if let if let boolValue -> if let boolValue
  • } else intValue -> } else if let intValue
@mithrann

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@mithrann mithrann commented Nov 22, 2018

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)
    }
@popochess

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@popochess popochess commented Jan 4, 2019

dude! you save my time

@ChiellieNL

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@ChiellieNL ChiellieNL commented Jan 12, 2019

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
    }
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@mikebuss mikebuss commented Jan 25, 2019

@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

@loudmouth

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@loudmouth loudmouth commented Mar 14, 2019

@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 ;-)

@sukov

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@sukov sukov commented Aug 26, 2019

@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

@davidforneron

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@davidforneron davidforneron commented Sep 2, 2019

Thanks for sharing this! I really need it :)

@rhwood

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@rhwood rhwood commented Jun 14, 2020

Thanks for this. I think if you renamed the gist to end in .swift instead of [space]Swift syntax highlighting will be added.

@noorulain17

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@noorulain17 noorulain17 commented Nov 29, 2020

Thanks for sharing this 👍

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