I think you need to determine between operator and operand too. It is bad practice, but it will work to do something like

EXECSCRIPT ='Mooh'
?EXECSCRIPT+'!'

This something different then

EXECSCRIPT(somethingunwanted)


This is only an example, it's clear that the twoliner will not work, but you have to consider this. Some functions are valid, others not, and not each in all circumstances.

Report is even worst, since the datatype of a reportfield is something the user might change for good reason.

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