private void EnsureSpacesAroundParenthesisedExpression(Expression expr) {
ReplacePreceedingWhiteSpace(
expr.GetStartIndex(_tree.LocationResolver),
_options.SpaceAfterOpeningAndBeforeClosingNonEmptyParenthesis ? " " : "",
_openParen
);
expr.Walk(this);
ReplaceFollowingWhiteSpace(
expr.GetEndIndex(_tree.LocationResolver),
_options.SpaceAfterOpeningAndBeforeClosingNonEmptyParenthesis ? " " : ""
);
}
