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Get a list of variables in a given expression

cessej

Anyone who have idea on how to get a list of variables in a given expression?

The expression is a string data type.

Thank you very much.

Parents

  • Flattening the list would be the wrong way to do this, because you lose all context. That's why a recursive function is used. To handle this you'd want to do something clever in the bit where the comment saying "ignore the car" is. Depending on the function, you'd recursively call with selective arguments. For example, with these functions:

    getSGq (~>)/getq/dbGetq (->): 1st arg (not 2nd)
    setSGq (~>)/putpropq/dbSetq(->): 1st and 2nd arg (not 3rd)
    setq (=): 2nd arg (not 1st)
    let/procedure/prog/ - rather more complex!

    Why are you doing this anyway? If you're trying to identify (say) global variables, this is something SKILL Lint will do for you - this has the rules about such syntax forms built in to allow it to identify variables.

    Regards,

    Andrew.

Reply

  • Flattening the list would be the wrong way to do this, because you lose all context. That's why a recursive function is used. To handle this you'd want to do something clever in the bit where the comment saying "ignore the car" is. Depending on the function, you'd recursively call with selective arguments. For example, with these functions:

    getSGq (~>)/getq/dbGetq (->): 1st arg (not 2nd)
    setSGq (~>)/putpropq/dbSetq(->): 1st and 2nd arg (not 3rd)
    setq (=): 2nd arg (not 1st)
    let/procedure/prog/ - rather more complex!

    Why are you doing this anyway? If you're trying to identify (say) global variables, this is something SKILL Lint will do for you - this has the rules about such syntax forms built in to allow it to identify variables.

    Regards,

    Andrew.

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