How to test if a field does not contain anything else than returns or tab?

Hugh Senior h at
Tue Feb 3 11:09:37 EST 2009

This assumes what you need is whether text is in the field...

function isEmpty pFld
  return (num of words of fld pFld = 0)
end isEmpty




I need to test if a given list field in a stack contains some values  
or if it is empty.
Well, by "empty" I mean that the field contains not any word or  
number. But it happens that it may include carriage returns and/or tabs.
In such cases :
field "thisField" is empty
return false.

If there were only carriage returns, I could test if each line of the  
field is empty;
indeed :
line x of fld "thisField" is empty
returns true if the only character in the line is cr
but returns false if there is at least one tab in the line.

I just tried :
if last char of fld "thisField" is empty  ;-))

that seems working well ! but a bit strange and might be not reliable ?

Is there a better trick ?

Thanks for any idea

Best regards from Grenoble

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