const (
	// OpNop does nothing
	OpNop = OpCode(iota)
	// OpPush pushes a component to stack
	OpPush
	// OpLitPush pushes a component to stack if it matches to the literal
	OpLitPush
	// OpPushM concatenates the remaining components and pushes it to stack
	OpPushM
	// OpConcatN pops N items from stack, concatenates them and pushes it back to stack
	OpConcatN
	// OpCapture pops an item and binds it to the variable
	OpCapture
	// OpEnd is the least postive invalid opcode.
	OpEnd
)

type DoubleArray struct {
	// Encoding keeps an encoding from string to int
	Encoding map[string]int
	// Base is the base array of Double Array
	Base []int
	// Check is the check array of Double Array
	Check []int
}

type OpCode int