mchess-server/chess/violation.go

package chess

type Violation string

var (
	InvalidMove            Violation = "invalid move"
	NoPieceAtStartSquare   Violation = "no piece at start square"
	WrongColorMoved        Violation = "wrong color moved"
	TargetSquareIsOccupied Violation = "target square is occupied"
	KingInCheck            Violation = "king would be in check after move"
	SomethingWentWrong     Violation = "something went wrong"
)

func (v Violation) String() string {
	return string(v)
}