private OperatorExpressionToken ParseOperator(PermissionExpressionToken lhs)
{
Lexeme l = lexer.ReadNext();
var opLex = l as OperatorLexeme;
if (!(l is OperatorLexeme))
{
throw new SyntaxErrorException("Expecting an Operator (& or |), not '" + l.Value + "'");
}
OperatorExpressionToken opToken;
if (opLex == OperatorLexeme.And)
{
opToken = new AndExpressionToken();
}
else
{
opToken = new OrExpressionToken();
}
opToken.Left = lhs;
opToken.Right = Parse();
return opToken;
}
private Expression<Func<bool>> BuildPermissionExpression(PermissionExpressionToken token)
{
return () => verifyFunction(token.PermissionName);
}