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POWrite Scheme data structures so they can be eval-d back in, or alternative
 

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    <p>I'm writing an application (A <a href="http://github.com/jmillikan/Yet-Another-Juggling-Animator" rel="nofollow noreferrer">juggling pattern animator</a>) in PLT Scheme that accepts Scheme expressions as values for some fields. I'm attempting to write a small text editor that will <strong>let me "explode" expressions into expressions that can still be eval'd but contain the data as literals</strong> for manual tweaking. </p> <p>For example,</p> <pre><code>(4hss-&gt;sexp "747") </code></pre> <p>is a function call that generates a legitimate pattern. If I eval and print that, it becomes </p> <pre><code>(((7 3) - - -) (- - (4 2) -) (- (7 2) - -) (- - - (7 1)) ((4 0) - - -) (- - (7 0) -) (- (7 2) - -) (- - - (4 3)) ((7 3) - - -) (- - (7 0) -) (- (4 1) - -) (- - - (7 1))) </code></pre> <p>which can be "read" as a string, but will not "eval" the same as the function. For this statement, of course, what I need would be as simple as</p> <pre><code>(quote (((7 3... </code></pre> <p>but other examples are non-trivial. This one, for example, contains structs which print as vectors:</p> <pre><code>pair-of-jugglers ; --&gt; (#(struct:hand #(struct:position -0.35 2.0 1.0) #(struct:position -0.6 2.05 1.1) 1.832595714594046) #(struct:hand #(struct:position 0.35 2.0 1.0) #(struct:position 0.6 2.0500000000000003 1.1) 1.308996938995747) #(struct:hand #(struct:position 0.35 -2.0 1.0) #(struct:position 0.6 -2.05 1.1) -1.3089969389957472) #(struct:hand #(struct:position -0.35 -2.0 1.0) #(struct:position -0.6 -2.05 1.1) -1.8325957145940461)) </code></pre> <p>I've thought of at least three possible solutions, none of which I like very much.</p> <p>Help me out before I start having bad recursion dreams again.</p>
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