static BooleanEngineBuilder()
{
var OperatorNode = Deferred <OperatorNode>();
var AndOperator = Terms.Text("AND")
.Or(
Terms.Text("&&")
);
var NotOperator = Terms.Text("NOT")
.Or(
Terms.Text("!")
);
var OrTextOperators = Terms.Text("OR")
.Or(
Terms.Text("||")
);
// Operators that need to be NOT next when the default OR ' ' operator is found.
var NotOrOperators = OneOf(AndOperator, NotOperator, OrTextOperators);
// Default operator.
var OrOperator = Literals.WhiteSpace()
.Then <string>(static x => " ") // Normalize whitespace.
