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About loop constructs

bobbygang

Hi, I have a strange problem. In skill code , can I set a function for loop constructs whose selection statement number is uncertain?
For example I set a  list Total=(A B C D E)  and their corresponding limit for loop just as ( 3 2 1 2 3 ).
And I set a new list Cycle =( A B). It includes part elements of Total as the statement 
Then I want a function LP(Total Cycle   (code)  )  to achieve like this( assume this function name is LP):

for(A 1 3
     for(B 1 2
          (code)
    )/*end for*/
)*end for*/

I f I modify change Cycle=(A B C)
LP(Total Cycle   (code)    )  will do something like this:

for(A 1 3
       for(B 1 2
            for(C 1 1
                     (code)
                )*end for*/
           )*end for*/
)*end for*/

Regards,


Bobby.

 

 

Parents

  • Seems a slightly odd requirement, but you could do it with this:

    defmacro(LP (Total Cycle @rest code)
      if(cdr(Cycle) then
        `for(,car(Cycle) 1 ,car(Total) LP(,cdr(Total) ,cdr(Cycle) ,@code))
      else
        `for(,car(Cycle) 1 ,(car Total) ,@code)
      )
    )

    ; example:
    procedure(foobar()
      LP((3 2 1) (A B C)
        println(list(A B C))
      )
    )

    Run foobar() once, and then you can do pp(foobar) to see the function - it will have then had the macro expanded. If you do the pp before running it, you'll see just the macro calls.

    Note the functions should really have sensible prefixes; calling them LP and foobar in the example above is not a good idea as they could clash with other poorly named functions. Also, if the requirement is that the arguments to LP are dynamic - i.e. they are variables which could change throughout the program, the above approach won't work because macros are done at compile time. If they're dynamic though, you might want to explain precisely what it is you're trying to do?

    Regards,

    Andrew.

Reply

  • Seems a slightly odd requirement, but you could do it with this:

    defmacro(LP (Total Cycle @rest code)
      if(cdr(Cycle) then
        `for(,car(Cycle) 1 ,car(Total) LP(,cdr(Total) ,cdr(Cycle) ,@code))
      else
        `for(,car(Cycle) 1 ,(car Total) ,@code)
      )
    )

    ; example:
    procedure(foobar()
      LP((3 2 1) (A B C)
        println(list(A B C))
      )
    )

    Run foobar() once, and then you can do pp(foobar) to see the function - it will have then had the macro expanded. If you do the pp before running it, you'll see just the macro calls.

    Note the functions should really have sensible prefixes; calling them LP and foobar in the example above is not a good idea as they could clash with other poorly named functions. Also, if the requirement is that the arguments to LP are dynamic - i.e. they are variables which could change throughout the program, the above approach won't work because macros are done at compile time. If they're dynamic though, you might want to explain precisely what it is you're trying to do?

    Regards,

    Andrew.

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