tlang-interperter-cs/tlanglib/LeftShift.cs

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namespace tlang
{
internal class LeftShiftNode : Node
{
public Node Left {get;set;}
public Node Right {get;set;}
public LeftShiftNode(Node left, Node right)
{
this.Left = left;
this.Right = right;
}
public override TObject Execute(IScopeEnvironment nodeEnv)
{
var l = Left.Execute(nodeEnv);
var r = Right.Execute(nodeEnv);
var lnum = l as TNumber;
var rnum = r as TNumber;
var dleft = l as TDictionary;
if(dleft != null)
{
if(dleft.MemberExists("ls"))
{
var mbm = dleft["ls"] as ICallable;
if(mbm != null)
{
return mbm.Call(r);
}
}
}
if(lnum != null && rnum != null)
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return TObject.Number((long)lnum.Value << (int)rnum.Value);
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return TObject.Null;
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}
}
}