DSL Command Arguments

All available arguments:

Using: function(index_of_argument) in simpleCommand or executor of SubCommand

Function	Description
argument	Null if argument not found or string
string	string or send error to sender
stringOrNull	same with argument
integer	integer or send error to sender
integerOrNull	Null if argument not found or integer
double	double or send error to sender
doubleOrNull	Null if argument not found or double
material	material or send error to sender
materialOrNull	Null if argument not found or material
world	world or send error to sender
worldOrNull	Null if argument not found or world
player	player or send error to sender
playerOrNull	Null if argument not found or player
offlinePlayer	offlinePlayer or send error to sender

Custom type

Also you can create your own type:

fun ExecutorContext.uuidOrNull(index: Int): UUID? = try { 
    UUID.fromString(argument(index)) 
    } catch(e: NullPointerException) {
        throw TypeParseException()
    }

Use argument(index) for get command argument as String?

If you need to send message if parse of type was failed, throw CommandExecuteException with one argument - tag of message

For example:

fun ExecutorContext.world(index: Int): World =
    worldOrNull(index) ?: run {
        throw CommandExecuteException("#no-such-world")
    }