public static GrLiteral getStepDefinitionPattern(final GrMethodCall stepDefinition) {
return ApplicationManager.getApplication().runReadAction(new NullableComputable<GrLiteral>() {
@Nullable
@Override
public GrLiteral compute() {
GrArgumentList argumentList = stepDefinition.getArgumentList();
if (argumentList == null) return null;
GroovyPsiElement[] arguments = argumentList.getAllArguments();
if (arguments.length == 0 || arguments.length > 2) return null;
GroovyPsiElement arg = arguments[0];
if (!(arg instanceof GrUnaryExpression && ((GrUnaryExpression)arg).getOperationTokenType() == GroovyTokenTypes.mBNOT)) return null;