internal static string Eval(object[] source, StringBuffer expression, IFormatProvider provider)
{
if (StringBuffer.IsNullOrEmpty(expression))
{
throw new ArgumentNullException("Expression cannot be null or empty.");
}
StringBuffer strIndex = expression.Copy();
object current = null;
strIndex.SubstringBefore(',', ESearch.FirstOccurrence)
.Fail(x => { x.SubstringBefore(':', ESearch.FirstOccurrence); })
.Do(x =>
{
int intIndex;
if (int.TryParse(x.ToString(), out intIndex))
{
if ((intIndex >= 0) && (intIndex < source.Length))
{
current = source[intIndex];
}
else
{ // IndexOutOfRangeException
throw new FormatException("Input string was not in a correct format.");
}
}
});
string format = null;
if (current != null)
{ // Index based
if (expression.StartsWithAny(StringBuffer.GetWhitespaces(), true, false) || expression.EndsWithAny(StringBuffer.GetWhitespaces(), true, false))
{
throw new FormatException("Input string was not in a correct format.");
}
format = expression.Copy()
.SubstringAfter(',', ESearch.FirstOccurrence)
.Fail(x =>
{
x.SubstringAfter(':', ESearch.FirstOccurrence)
.Fail(y => y.Clear());
})
.Prepend("{0:")
.Append('}')
.ToString();
}
else
{ // Name based
current = source[source.Length - 1];
if (expression.ContainsAny(StringBuffer.GetWhitespaces(), 0, expression.Length, false))
{
throw new FormatException("Input string was not in a correct format.");
}
var expre = expression.Copy()
.DoAtWhen(x => x.IndexOf(':'),
(x, i) => (i > 0),
(x, i) =>
{
format = x.ToString(i + 1);
x.Crop(0, i);
});
//StringBuffer prop;
do
{
/*
* prop = expre.Copy()
* .SubstringRange(0, '.', ESearch.FirstOccurrence)
* .Fail(x => expre.Clear())
* .Succeed(x => expre.SubstringAfter('.', ESearch.FirstOccurrence))
* .DoWhenElse(x => x.Contains('['),
* x => { current = Formatter.GetIndexedPropertyValue(current, x.ToString()); },
* x => { current = Formatter.GetPropertyValue(current, x.ToString()); });
*/
expre.Copy()
.SubstringRange(0, '.', ESearch.FirstOccurrence)
.Fail(x => expre.Clear())
.Succeed(x => expre.SubstringAfter('.', ESearch.FirstOccurrence))
.DoWhenElse(x => x.Contains('['),
x => { current = Formatter.GetIndexedPropertyValue(current, x.ToString()); },
x => { current = Formatter.GetPropertyValue(current, x.ToString()); });
}while ((expre.Length > 0) && (current != null));
if (current == null)
{
return("");
}
if (format == null)
{
return(current.ToString());
}
format = string.Concat("{0:" + format + "}");
}
if (provider != null)
{
return(string.Format(provider, format, current));
}
return(string.Format(format, current));
}