Using Word VBA, How to change the condition of a loop without having to replicate the whole loop?

Question

I want to call a routine with arguments to be used as the condition of a loop. The code that follows doesn't works, it gives the ERROR 13 (incompatible types). How do I fix this? Many thanks!

Sub foo()
   Call bar("a>10")
End Sub

Sub bar(myCondition as String)
   Dim a as Integer
   Do
      Debug.Print a
      a=a+1
   Loop Until myCondition
End Sub

Answer 1

Word has no equivalent to Excel's Evaluate so this is only possible the "long way around". You need to figure out every variation you want to pass for evaluation, test for which it is, and then run the correct type of loop. Seems to me you'd need to do something like this, anyway, since using the test you have in your example wouldn't loop for "<" (assuming you use positive integers).

In order to avoid repeating the code you want to execute in the loop, put that in a separate function.

Sub foo()
   Call bar(">", 10)
End Sub

Sub bar(ByVal conditionOperator As String, ByVal conditionValue As Long)
   Dim a As Long
   Select Case conditionOperator
    Case Is = "<"
        Do
         a = PerformLoop(a)
        Loop While a < conditionValue
    Case Is = ">"
        Do
         a = PerformLoop(a)
        Loop Until a > conditionValue
    Case Is = "="
        Do
         a = PerformLoop(a)
        Loop Until a = conditionValue
    Case Is = ">="
        Do
         a = PerformLoop(a)
        Loop Until a >= conditionValue
    Case Is = "<="
        Do
         a = PerformLoop(a)
        Loop While a < conditionValue
   End Select
End Sub

Function PerformLoop(a As Long) As Long
      Debug.Print a
      a = a + 1
      PerformLoop = a
End Function