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"
	CastlingThroughCheck     Violation = "king would move through check"
	CastlingWhileKingInCheck Violation = "king cannot castle while in check"
)

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