/// <summary>
/// Duplicates top stack item if its value is not 0. Return value indicates success.
/// </summary>
/// <param name="opData">Data to use</param>
/// <param name="error">Error message (null if sucessful, otherwise will contain information about the failure)</param>
/// <returns>True if operation was successful, false if otherwise</returns>
public override bool Run(IOpData opData, out string error)
{
if (opData.ItemCount < 1)
{
error = "There was no item left in the stack to check and duplicate.";
return(false);
}
byte[] data = opData.Peek();
if (OpHelper.IsNotZero(data))
{
opData.Push(data);
}
error = null;
return(true);
}
/// <summary>
/// Removes top stack item only passes if it is true. Return value indicates success.
/// </summary>
/// <param name="opData">Data to use</param>
/// <param name="error">Error message (null if sucessful, otherwise will contain information about the failure)</param>
/// <returns>True if operation was successful, false if otherwise</returns>
public override bool Run(IOpData opData, out string error)
{
if (opData.ItemCount < 1)
{
error = "There was not enough items left in the stack.";
return(false);
}
// Check the top stack value, only fail if False
bool b = OpHelper.IsNotZero(opData.Pop());
if (!b)
{
error = "Top stack item value was 'false'.";
return(false);
}
error = null;
return(true);
}
public override bool Run(IOpData opData, out string error)
{
if (opData.ItemCount < 1)
{
error = "Invalid number of elements in stack.";
return(false);
}
// TODO: check what this part is
// https://github.com/bitcoin/bitcoin/blob/a822a0e4f6317f98cde6f0d5abe952b4e8992ac9/src/script/interpreter.cpp#L478-L483
// probably have to include it in whever we run these operations.
// Remove top stack item and interpret it as bool
// OP_IF: runs for True
// OP_NOTIF: runs for false
bool isRunnable = OpHelper.IsNotZero(opData.Pop()) & ShouldRunIfTopItemIs; // Note: this is a bitwise operation not logical
if (isRunnable)
{
foreach (var op in mainOps)
{
if (!op.Run(opData, out error))
{
return(false);
}
}
}
else if (elseOps != null && elseOps.Length != 0)
{
foreach (var op in elseOps)
{
if (!op.Run(opData, out error))
{
return(false);
}
}
}
error = null;
return(true);
}
