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How DNA works

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Gobo:
Eric, thanks a lot! Would you please also post ExecuteFlowCommands function's source?

EricL:
"The memory and both integer and boolean stacks are persistent during a single cycle. It means, that if you leave a value in a stack in one gene, it will be still there when you enter the next gene. "

This is not strictly correct for the boolean stack.  As you say, there are no implicit operators on the integer stack.  It takes explicit DNA commands to push and pop from the stack and gene boundaries do not have implicit meaning other than marking the boundaries of non-coding regions within which push and pop operations are ignroed.

But gene boundaries implicitly operate on the boolean stack.   A cond statement clears the boolean stack for example (a clear stack is implicitly true).  A start statement is an implicit AND of all arguments on the boolean stack.




--- Code: ---Private Function ExecuteFlowCommands(n As Integer) As Boolean
'returns true if a stop command was found (start, stop, or else)
'returns false if cond was found
  ExecuteFlowCommands = False
  Select Case n
    Case 1 'cond
      CurrentFlow = COND
      ' Clear the boolean stack
      Condst.pos = 0
      Condst.val(0) = 0
      Exit Function
    Case 2, 3, 4 'assume a stop command, or it really is a stop command
      'this is supposed to come before case 2 and 3, since these commands
      'must be executed before start and else have a chance to go
      ExecuteFlowCommands = True
      If CurrentFlow = COND Then CurrentCondFlag = AddupCond
      CurrentFlow = CLEAR
      Select Case n
        Case 2 'start
          If CurrentCondFlag = NEXTBODY Then CurrentFlow = body
          currgene = currgene + 1
        Case 3 'else
          If CurrentCondFlag = NEXTELSE Then CurrentFlow = ELSEBODY
          currgene = currgene + 1
      End Select
  End Select
End Function
--- End code ---

Gobo:

--- Quote from: EricL ---
--- Code: ---    
      Case 7 'store, inc and dec
        If CurrentFlow = body Or CurrentFlow = ELSEBODY Then
          If CondStateIsTrue Then  ' Check the Bool stack.  If empty or True on top, do the stores.  Don't if False.
            ExecuteStores .DNA(a).value
            If n = robfocus Or Not (rob(n).console Is Nothing) Then rob(n).ga(currgene) = True  'EricL  This gene fired this cycle!  Populate ga()
          End If
        End If
--- End code ---

--- End quote ---
WOW! Does it mean, that

--- Code: ---*.nrg 20000 > 50 .repro store
--- End code ---
now works as expected?

EricL:

--- Quote from: Gobo ---WOW! Does it mean, that

--- Code: ---*.nrg 20000 > 50 .repro store
--- End code ---
now works as expected?
--- End quote ---
Yes, exactly.  Check out this topic.

Gobo:

--- Quote from: EricL ---But gene boundaries implicitly operate on the boolean stack.   A cond statement clears the boolean stack for example (a clear stack is implicitly true).  A start statement is an implicit AND of all arguments on the boolean stack.
--- End quote ---
Yep, I noticed it already and changed that para. Though it needs to be rewritten again taking into account the cutting edge wisdom

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