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print list content and infix/prefix notation

marcelpreda

Hi,

I have question related to how the list content is printed in CIW.

Let's assume that we have a structure like below, as you see the value associate with k1 is printed as value(a b c), but actually it was set as (value a b c).

And we would like to print it as (value a b c), because the other format is confusing especially for people new to skill.

I've noticed that this is happening when the first element is a skill function name.

I'm remember that there is setting in the CIW to print the list in the format that we want, but I don't remember the exact statement.

Any idea?

zz = '(nil k1 (value a b c) k2 (a b c value))
(nil k1 value(a b c) k2 (a b c value))
zz->k1
value(a b c)
zz->k2
(a b c value)


Thank you,
Marcel

  • Andrew Beckett

    Hi Marcel,

    This is because you're relying on the default print representation, which is to "pretty print" the list, and that is done such that something that is a list that looks like code will be printed in "infix" format (i.e. as code). Because there is a value() function, the list (value a b) shows as value(a b). Similarly (plus a b) would show as a+b. You could use status(printinfix nil) but bear in mind that that may disturb other things that use the print representation and is possibly a dangerous thing to do (you could use unwindProtect to ensure it gets reset appropriately).

    Another approach could be to use a function like this:

    (defun abListToString (lst "l")
  (strcat "(" 
          (buildString 
            (foreach mapcar elem lst
                     (cond 
                       ((null elem) "nil")
                       ((listp elem) (abListToString elem))
                       (t (lsprintf "%L" elem))
                       )))
          ")")
  )

    I've just been discussing this with some colleagues, and we have tried to get this done in the past. I'll revisit it (I'll file an enhancement on your behalf) to have a %L-like format specifier which truly prints lists as non-infix lists.

    Andrew

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