//public bool Read<T>(out T token)
//{
// var baseRead = Read(out token);
// if (!(token is T))
// throw new Exception("Expected " + typeof(T));
// return baseRead;
//}
public bool Read(out BooleanExpressionToken token)
{
Position++;
if (IsEof)
{
token = null;
return(false);
}
token = Tokens[Position];
return(true);
}
private ScalarValueExpression ReadScalar(BooleanExpressionToken token)
{
if (token is VariableReference _variable)
{
return new IdentifierExpression {
Name = _variable.Name
}
}
;
if (token is DecimalLiteral @decimal)
{
return new LiteralDecimalExpression {
Value = @decimal.Value
}
}
;
if (token is StringLiteral @string)
{
return new LiteralStringExpression {
Value = @string.Value
}
}
;
if (token is IntegerLiteral @int)
{
return new LiteralIntExpression {
Value = @int.Value
}
}
;
if (token is GuidLiteral @guid)
{
return new LiteralGuidExpression {
Value = @guid.Value
}
}
;
throw new ArgumentException("Invalid scalar expression.");
}
