public static object DownTo(RubyContext /*!*/ context, BlockParam block, object /*!*/ self, object other)
{
object i = self;
object compare = null;
while (RubyOps.IsFalse(compare))
{
// Rather than test i >= other we test !(i < other)
compare = LibrarySites.LessThan(context, i, other);
// If the comparison failed (i.e. returned null) then we throw an error.
if (compare == null)
{
throw RubyExceptions.MakeComparisonError(context, i, other);
}
// If the comparison worked but returned false then we
if (RubyOps.IsFalse(compare))
{
object result;
if (block == null)
{
throw RubyExceptions.NoBlockGiven();
}
if (block.Yield(i, out result))
{
return(result);
}
i = LibrarySites.Subtract(context, i, 1);
}
}
return(self);
}
public static object Abs(RubyContext /*!*/ context, object self)
{
if (RubyOps.IsTrue(LibrarySites.LessThan(context, self, 0)))
{
return(LibrarySites.UnaryMinus(context, self));
}
return(self);
}
/// <summary>
/// Check that the object, when converted to an integer, is not less than or equal to zero.
/// </summary>
private static void CheckStep(RubyContext /*!*/ context, object step)
{
if (RubySites.Equal(context, step, 0))
{
throw RubyExceptions.CreateArgumentError("step can't be 0");
}
if (RubyOps.IsTrue(LibrarySites.LessThan(context, step, 0)))
{
throw RubyExceptions.CreateArgumentError("step can't be negative");
}
}
public static object Remainder(RubyContext /*!*/ context, object self, object other)
{
object modulo = LibrarySites.Modulo(context, self, other);
if (!Protocols.IsEqual(context, modulo, 0))
{
// modulo is not zero
if (RubyOps.IsTrue(LibrarySites.LessThan(context, self, 0)) && RubyOps.IsTrue(LibrarySites.GreaterThan(context, other, 0)) ||
RubyOps.IsTrue(LibrarySites.GreaterThan(context, self, 0)) && RubyOps.IsTrue(LibrarySites.LessThan(context, other, 0)))
{
// (self is negative and other is positive) OR (self is positive and other is negative)
return(LibrarySites.Minus(context, modulo, other));
}
}
// Either modulo is zero or self and other are not of the same sign
return(modulo);
}
public static object Times(RubyContext /*!*/ context, BlockParam block, object /*!*/ self)
{
object i = 0;
while (RubyOps.IsTrue(LibrarySites.LessThan(context, i, self)))
{
if (block == null)
{
throw RubyExceptions.NoBlockGiven();
}
object result;
if (block.Yield(i, out result))
{
return(result);
}
i = LibrarySites.Add(context, i, 1);
}
return(self);
}
