Re: m4 recursive macro help

From: Erik Max Francis (max_at_alcyone.com)
Date: 09/10/03

  • Next message: Bill Marcum: "Re: Compile error: wrong machine type" 
    Date: Wed, 10 Sep 2003 14:41:42 -0700

    Jason Sinnamon wrote:

    > I need to search a list of values such that I can do something like
    > this:
    >
    > define(`match', `index(:word1:word2:, :$1:)')
    >
    > define(`rmatch', ?????)
    >
    > rmatch(word1, word2, word3,
    >
    > line1
    > line2
    >
    > )
    >
    > The lines should be printed if one of the words matches a word in the
    > colon-separated list. The macro for matching a single word from the
    > list
    > works, I am just really stuck on the recursive match macro.

    So do the following (pseudocode):

    1. if there is only one argument in the list (the lines to print), then
       exit
    2. search for the first word in the table
    3. if it is present, print the last argument in the list and exit
    4. if it is not present, call recursively with the first argument
       removed

    The only tricky part here is printing the last argument to a macro,
    since there is no builtin way to do this in m4 (that I'm aware of), and
    if there are more than 9 arguments to the list it can get ugly. So,
    write a support macro which recurses through its argument list to find
    the last argument:

    1. if the number of arguments is 1, print it and exit
    2. if it is not 1, then call recursively with the first argument removed 

    -- 
   Erik Max Francis && max@alcyone.com && http://www.alcyone.com/max/
 __ San Jose, CA, USA && 37 20 N 121 53 W && &tSftDotIotE
/  \ I want to know God's thought; the rest are details.
\__/  Albert Einstein
  • Next message: Bill Marcum: "Re: Compile error: wrong machine type"

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