public static PipeValue Let(PipeContext context)
{
while (context.HasArgument())
{
string name = (string)context.TakeArgument();
PipeLambda fn = context.TakeFunction();
if (fn != null)
{
context.Globals[name] = fn.Invoke(context.Value);
}
else
{
context.Globals[name] = context.TakeArgument();
}
}
return(PipeValue.Undefined);
}
public static PipeValue Sum(PipeContext context)
{
PipeValue result = PipeValue.Undefined;
PipeLambda fn = context.TakeFunction();
if (fn == null)
{
result = context.TakeArgument();
fn = context.TakeFunction();
}
if (fn == null)
{
if (context.HasArgument())
{
fn = context.TakeArgumentAsKeyFunction();
}
else
{
fn = new PipeLambda((obj, i) => obj);
}
}
PipeValuePropertyEnumerator enumerator = context.Value.GetEnumerator();
while (enumerator.MoveNext())
{
if (result != PipeValue.Undefined)
{
result = result + fn.Invoke(enumerator);
}
else
{
result = fn.Invoke(enumerator);
}
}
return(result);
}
