/// <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(EachStorage /*!*/ storage, BlockParam /*!*/ block, Range /*!*/ self, MutableString begin, MutableString end, int step)
{
Assert.NotNull(storage, block, self);
CheckStep(step);
object result;
MutableString item = begin;
int comp;
while ((comp = Protocols.Compare(storage, item, end)) < 0)
{
if (block.Yield(item.Clone(), out result))
{
return(result);
}
if (ReferenceEquals(item, begin))
{
item = item.Clone();
}
// TODO: this can be optimized
for (int i = 0; i < step; i++)
{
MutableStringOps.SuccInPlace(item);
}
if (item.Length > end.Length)
{
return(self);
}
}
if (comp == 0 && !self.ExcludeEnd)
{
if (block.Yield(item.Clone(), out result))
{
return(result);
}
}
return(self);
}
/// <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 IEnumerable <MutableString> EachStepString(ComparisonStorage /*!*/ storage, Range /*!*/ self, int step)
{
Assert.NotNull(storage, self);
CheckStep(step);
var begin = (MutableString)self.Begin;
var end = (MutableString)self.End;
MutableString item = begin;
int comp;
while ((comp = Protocols.Compare(storage, item, end)) < 0)
{
yield return(item.Clone());
if (ReferenceEquals(item, begin))
{
item = item.Clone();
}
// TODO: this can be optimized
for (int i = 0; i < step; i++)
{
MutableStringOps.SuccInPlace(item);
}
if (item.Length > end.Length)
{
yield break;
}
}
if (comp == 0 && !self.ExcludeEnd)
{
yield return(item.Clone());
}
}
