/// <summary>
/// Obtiene un valor predeterminado con un error
/// </summary>
public static ValueBase GetError(string error)
{
ValueString value = new ValueString("ERROR");
// Asigna el error
value.Error = error;
// Devuelve el valor
return(value);
}
/// <summary>
/// Ejecuta una operación
/// </summary>
public override ValueBase Execute(ValueBase value, string operation)
{
ValueBase newValue = null;
// Ejecuta la operación
switch (operation)
{
case "+":
if (value is ValueNumeric)
{
newValue = new ValueNumeric((value as ValueNumeric).Value + Value);
}
else
{
newValue = new ValueString((value as ValueString).Value + Content);
}
break;
case "-":
if (value is ValueNumeric)
{
newValue = new ValueNumeric((value as ValueNumeric).Value - Value);
}
break;
case "/":
if (value is ValueNumeric)
{
if (Value == 0)
{
newValue = ValueBase.GetError("No se puede dividir por cero");
}
else
{
newValue = new ValueNumeric((value as ValueNumeric).Value / Value);
}
}
break;
case "*":
if (value is ValueNumeric)
{
newValue = new ValueNumeric((value as ValueNumeric).Value * Value);
}
break;
case ">=":
case "<=":
case "==":
case "!=":
case ">":
case "<":
if (value is ValueString)
{
newValue = new ValueString(Content).Execute(value as ValueString, operation);
}
else
{
double first = (value as ValueNumeric).Value;
double second = Value;
// Compara los números
switch (operation)
{
case ">=":
newValue = new ValueBool(first >= second);
break;
case "<=":
newValue = new ValueBool(first <= second);
break;
case "==":
newValue = new ValueBool(first == second);
break;
case "!=":
newValue = new ValueBool(first != second);
break;
case ">":
newValue = new ValueBool(first > second);
break;
case "<":
newValue = new ValueBool(first < second);
break;
}
}
break;
}
// Crea el error
if (newValue == null)
{
newValue = ValueBase.GetError($"No se puede utilizar el operador '{operation}' entre los valores {Content} y {value.Content}");
}
// Devuelve el valor
return(newValue);
}
/// <summary>
/// Ejecuta una operación
/// </summary>
public override ValueBase Execute(ValueBase value, string operation)
{
ValueBase newValue = null;
// Ejecuta la operación
switch (operation)
{
case "+":
if (value is ValueNumeric)
{
newValue = new ValueString(value.Content + Value);
}
else
{
newValue = new ValueString((value as ValueString).Value + Value);
}
break;
case ">=":
case "<=":
case "==":
case "!=":
case ">":
case "<":
int compare = Normalize(value.Content).CompareTo(Normalize(Content));
// Compara las cadenas
switch (operation)
{
case ">=":
newValue = new ValueBool(compare >= 0);
break;
case "<=":
newValue = new ValueBool(compare <= 0);
break;
case "==":
newValue = new ValueBool(compare == 0);
break;
case "!=":
newValue = new ValueBool(compare != 0);
break;
case ">":
newValue = new ValueBool(compare > 0);
break;
case "<":
newValue = new ValueBool(compare < 0);
break;
}
break;
}
// Crea el error
if (newValue == null)
{
newValue = ValueBase.GetError($"No se puede utilizar el operador '{operation}' entre los valores {Content} y {value.Content}");
}
// Devuelve el valor
return(newValue);
}