//
//  JSON.swift
//  HVFoundation
//
//  Created by Harry Lin on 2017/7/24.
//  Copyright © 2017年 heimavista. All rights reserved.
//


import Foundation


public enum JSON {
    case null
    case bool(Bool)
    case number(Double)
    case string(String)
    case array([JSON])
    case dictionary([String: JSON])
    
    public subscript(key: String) -> JSON? {
        get {
            guard case .dictionary(let dictionary) = self else { return nil }
            return dictionary[key]
        }
        set {
            guard case .dictionary(var dictionary) = self else { return }
            dictionary[key] = newValue
            self = .dictionary(dictionary)
        }
    }
}


extension Optional where Wrapped == JSON {
    public subscript(key: String) -> Wrapped? { // public subscript(key: String) -> JSON? is OK
        get {
            return map { $0[key] } ?? nil
        }
        set {
            guard case var wrapped? = self else { return }
            wrapped[key] = newValue
            self = wrapped
        }
    }
}

Assertion failed: ((!key.isDependent() || getCurGenericContext()) && "dependent type outside of generic context?!"), function getTypeLowering, file /Users/buildnode/jenkins/workspace/oss-swift-package-osx/swift/lib/SIL/TypeLowering.cpp, line 1431.

extension Optional where Wrapped == String {
    public subscript(key: String) -> Wrapped? {
        return nil
    }
}