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Convert a list of symbols with value as a local variable.

cessej

I have given with a list of symbols with a value. What I want is to be able to call/use the symbol as a variable. What function do I need to convert a given list as a variable? Also these variables are local only to the given user function.

procedure(myFunc()

myList = list( list('varA 1.0) list('varB 2.0) list('varC 4.0))

; what function do I need to convert the given list as a variable?

;; also these variables are local only inside this function.

varC=varA + varB   ;; varC having value of 3.0

println(varA + varB)  ;; expected output is 3.0

 )

Parents

  • I would probably do it like this:

     (defmacro abWithRules (ruleAssoc listOfVars @rest body)
      `(let ,(foreach mapcar varName listOfVars
              `(,varName (cadr (assoc ',varName ,ruleAssoc))))
         ,@body
         )
      )

    Then I could write:

    abWithRules(myList (varA varB varC)
      varC=varA+varB
      println(varC)
    )

    The first arg is the rule assoc list, the second is the list of local variables you want to have - which will be initialized to the corresponding values in the assoc list,  and then the rest is the body.

    You can see what this expands to with:

    expandMacro('abWithRules(myList (varA varB varC)
      varC=varA+varB
      println(varC)
    ))

    which gives:

     let(((varA
                cadr(assoc('varA myList))
            )
            (varB
                cadr(assoc('varB myList))
            )
            (varC
                cadr(assoc('varC myList))
            )
        )
        (varC = (varA + varB))
        println(varC)
    )

    Regards,

    Andrew.

     

Reply

  • I would probably do it like this:

     (defmacro abWithRules (ruleAssoc listOfVars @rest body)
      `(let ,(foreach mapcar varName listOfVars
              `(,varName (cadr (assoc ',varName ,ruleAssoc))))
         ,@body
         )
      )

    Then I could write:

    abWithRules(myList (varA varB varC)
      varC=varA+varB
      println(varC)
    )

    The first arg is the rule assoc list, the second is the list of local variables you want to have - which will be initialized to the corresponding values in the assoc list,  and then the rest is the body.

    You can see what this expands to with:

    expandMacro('abWithRules(myList (varA varB varC)
      varC=varA+varB
      println(varC)
    ))

    which gives:

     let(((varA
                cadr(assoc('varA myList))
            )
            (varB
                cadr(assoc('varB myList))
            )
            (varC
                cadr(assoc('varC myList))
            )
        )
        (varC = (varA + varB))
        println(varC)
    )

    Regards,

    Andrew.

     

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