(Swift 3,4,5...) Modify Parts of JSON Document

Demonstrates how to modify parts of a JSON document. This example uses the following JSON document:

{
   "fruit": [
      	{
         "kind": "apple",
	 "count": 24,
	 "fresh": true,
	 "extraInfo": null,
	 "listA": [ "abc", 1, null, false ],
	 "objectB": { "animal" : "monkey" }
      	},
	{
         "kind": "pear",
	 "count": 18,
	 "fresh": false,
	 "extraInfo": null
	 "listA": [ "xyz", 24, null, true ],
	 "objectB": { "animal" : "lemur" }
	}
    ],
    "list" : [ "banana", 12, true, null, "orange", 12.5, { "ticker": "AAPL" }, [ 1, 2, 3, 4, 5 ] ],
    "alien" : true
}

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func chilkatTest() {
    let json = CkoJsonObject()!

    // Load the JSON from a file.
    var success: Bool = json.loadFile("qa_data/json/modifySample.json")
    if success != true {
        print("\(json.lastErrorText!)")
        return
    }

    // This example will not check for errors (i.e. null / false / 0 return values)...

    // Get the "list" array:
    var listA: CkoJsonArray? = json.array(of: "list")

    // Modify values in the list.

    // Change banana to plantain
    success = listA!.setStringAt(0, value: "plantain")

    // Change 12 to 24
    success = listA!.setIntAt(1, value: 24)

    // Change true to false
    success = listA!.setBoolAt(2, value: false)

    // Is the 3rd item null?
    var bNull: Bool = listA!.isNull(at: 3)

    // Change "orange" to 32.
    success = listA!.setIntAt(4, value: 32)

    // Change 12.5 to 31.2
    success = listA!.setNumberAt(5, value: "31.2")

    // Replace the { "ticker" : "AAPL" } object with { "ticker" : "GOOG" }
    // Do this by deleting, then inserting a new object at the same location.
    success = listA!.delete(at: 6)
    success = listA!.addObject(at: 6)
    var tickerObj: CkoJsonObject? = listA!.object(at: 6)
    success = tickerObj!.addString(at: -1, name: "ticker", value: "GOOG")

    tickerObj = nil

    // Replace "[ 1, 2, 3, 4, 5 ]" with "[ "apple", 22, true, null, 1080.25 ]"
    success = listA!.delete(at: 7)
    success = listA!.add(at: 7)
    var aa: CkoJsonArray? = listA!.array(at: 7)
    success = aa!.addString(at: -1, value: "apple")
    success = aa!.addInt(at: -1, value: 22)
    success = aa!.addBool(at: -1, value: true)
    success = aa!.addNull(at: -1)
    success = aa!.addNumber(at: -1, numericStr: "1080.25")
    aa = nil

    listA = nil

    // Get the "fruit" array
    var aFruit: CkoJsonArray? = json.array(at: 0)

    // Get the 1st element:
    var appleObj: CkoJsonObject? = aFruit!.object(at: 0)

    // Modify values by member name:
    success = appleObj!.setStringOf("fruit", value: "fuji_apple")
    success = appleObj!.setIntOf("count", value: 46)
    success = appleObj!.setBoolOf("fresh", value: false)
    success = appleObj!.setStringOf("extraInfo", value: "developed by growers at the Tohoku Research Station in Fujisaki")

    appleObj = nil

    // Modify values by index:
    var pearObj: CkoJsonObject? = aFruit!.object(at: 1)
    success = pearObj!.setStringAt(0, value: "bartlett_pear")
    success = pearObj!.setIntAt(1, value: 12)
    success = pearObj!.setBoolAt(2, value: false)
    success = pearObj!.setStringAt(3, value: "harvested in late August to early September")
    pearObj = nil

    aFruit = nil

    json.emitCompact = false
    print("\(json.emit()!)")

}