JsonReaderExtensions.kt

fun JsonReader.skipNameAndValue() {
	skipName()
	skipValue()
}

fun JsonReader.nextLongOrNull() =
	if (peek() == JsonReader.Token.NULL) {
		nextNull<Long>()
		null
	} else
		nextLong()

fun JsonReader.nextStringAsInt() =
		when(peek()) {
			JsonReader.Token.STRING -> nextString().toInt()
			JsonReader.Token.NULL -> nextNull<Int>()
			else -> nextInt()
		}

fun JsonReader.nextStringOrNull() =
		if (peek() == JsonReader.Token.NULL) {
			nextNull<String>()
			null
		} else
			nextString()

/**
 * Reads the next object and runs [body] for each property in it. If there is null or an array instead
 * of the expected object, just ignore it.
 *
 * @return Boolean Returns false the object exists, but is empty
 */
inline fun JsonReader.readObject(body: JsonReader.() -> Unit): Boolean {
	when(peek()) {
		JsonReader.Token.NULL -> {
			nextNull<Unit>()
		}

		JsonReader.Token.BEGIN_ARRAY -> {
			readArray {  }

			return false
		}

		else -> {
			beginObject()
			if (peek() == JsonReader.Token.END_OBJECT) {
				endObject()
				return false
			}

			while (hasNext()) {
				body()
			}
			endObject()
		}
	}

	return true
}

inline fun JsonReader.readArray(body: () -> Unit) {
	if (peek() == JsonReader.Token.NULL) { nextNull<Unit>(); return }

	beginArray()
	while (hasNext()) {
		body()
	}
	endArray()
}

fun JsonReader.readStringArrayTo(list: MutableSet<String>) {
	if (peek() == JsonReader.Token.NULL) { nextNull<Unit>(); return }

	beginArray()
	while (hasNext()) {
		list.add(nextString())
	}
	endArray()
}