On Fri, Jan 8, 2010 at 9:10 AM, tristan <tristan.k...@gmail.com> wrote: > > At first I thought I had solved it, as calling (parse-infix "a*(b+c)") > returned the desired function that i could call. However as soon as i > attempted to use it in the form (parse-infix users-input) it falls > over with a "Don't know how to create ISeq from: clojure.lang.Symbol" > error (examples in code at the bottom of the above file). I have > fallen victim here to my own lack of understanding of macros. I now > understand my folly and have a better understanding of how macro > expansion works, however now I'm stuck as to how to solve this > problem.
I think you're very close. Having code that takes a string and returns a anonymous fn form is good, but as you noticed having that code in a macro doesn't seem to be what you want. Because you're starting with a user-supplied string, you are going to need to use 'eval'. Perhaps try chaning parse-infix to be a fn instead of a macro, but still have it return (list 'fn ...etc). Then (eval (parse-infix ...)) to get an actual fn object that you can call repeatedly. --Chouser -- -- I funded Clojure 2010, did you?
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