/// <summary>
/// Step through a Range of Strings.
/// </summary>
/// <remarks>
/// This method requires step to be a Fixnum.
/// It uses a hybrid string comparison to prevent infinite loops and calls String#succ to get each item in the range.
/// </remarks>
private static object StepString(RubyContext /*!*/ context, BlockParam block, Range /*!*/ self, MutableString begin, MutableString end, int step)
{
CheckStep(step);
object result;
MutableString item = begin;
int comp;
while ((comp = Protocols.Compare(context, item, end)) < 0)
{
if (block == null)
{
throw RubyExceptions.NoBlockGiven();
}
if (block.Yield(item, out result))
{
return(result);
}
for (int i = 0; i < step; ++i)
{
item = (MutableString)RubySites.Successor(context, item);
}
if (item.Length > end.Length)
{
return(self);
}
}
if (comp == 0 && !self.ExcludeEnd)
{
if (block == null)
{
throw RubyExceptions.NoBlockGiven();
}
if (block.Yield(item, out result))
{
return(result);
}
}
return(self);
}
/// <summary>
/// Step through a Range of objects that are not Numeric or String.
/// </summary>
private static object StepObject(RubyContext /*!*/ context, BlockParam block, Range /*!*/ self, object begin, object end, int step)
{
CheckStep(context, step);
object item = begin, result;
int comp;
while ((comp = Protocols.Compare(context, item, end)) < 0)
{
if (block == null)
{
throw RubyExceptions.NoBlockGiven();
}
if (block.Yield(item, out result))
{
return(result);
}
for (int i = 0; i < step; ++i)
{
item = RubySites.Successor(context, item);
}
}
if (comp == 0 && !self.ExcludeEnd)
{
if (block == null)
{
throw RubyExceptions.NoBlockGiven();
}
if (block.Yield(item, out result))
{
return(result);
}
}
return(self);
}