/// <summary>
/// Recupera o valor do termo condicional.
/// </summary>
/// <param name="enumerator"></param>
/// <param name="configuration"></param>
/// <returns></returns>
private static ConditionalTerm GetTerm(ref IEnumerator <Text.InterpreterExpression.Expression> enumerator, Text.InterpreterExpression.ILexerConfiguration configuration)
{
var item = enumerator.Current;
if (item.Token == (int)Text.InterpreterExpression.TokenID.Minus)
{
if (!enumerator.MoveNext())
{
throw new ConditionalParserException("Expected expression after minus");
}
return(new MinusTerm(GetTerm(ref enumerator, configuration)));
}
else if (item.Token == (int)Parser.SqlTokenID.kCase)
{
return(GetCaseConditional(ref enumerator, configuration));
}
var container = item.Text.Length > 0 && item.Token != (int)Colosoft.Text.InterpreterExpression.TokenID.StringLiteral ? Array.Find(configuration.Containers, f => f.Start == item.Text[0]) : null;
if (container != null)
{
enumerator.MoveNext();
return(GetContainer(ref enumerator, configuration, container));
}
var expression = new Parser.SqlExpression(item);
if (expression.Type == Parser.SqlExpressionType.Column)
{
return(new Column(expression));
}
else if (expression.Type == Parser.SqlExpressionType.Variable)
{
return(new Variable(expression.Value.Text));
}
return(new Constant(item.ToString()));
}
/// <summary>
/// Cria a instancia com base na expressão.
/// </summary>
/// <param name="expression"></param>
internal Column(Parser.SqlExpression expression)
{
expression.Require("expression").NotNull();
var text = expression.Value.Text;
text = text.Trim();
var lastEmpty = text.LastIndexOf(' ');
var splittedExpression = text.Split('.');
for (var i = lastEmpty; i > 0; i--)
{
if (text[i] != ' ')
{
if (splittedExpression.Length > 1)
{
Name = splittedExpression[1].Substring(0, i + 1).Trim();
Owner = splittedExpression[0];
}
else
{
Name = text.Substring(0, i + 1).Trim();
}
}
}
if (splittedExpression.Length > 1)
{
Name = lastEmpty < 0 ? splittedExpression[1] : null;
Owner = splittedExpression[0];
}
else
{
Name = lastEmpty < 0 ? text : null;
}
}