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POHow does clojure's syntax-quote work?
 

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  1. POHow does clojure's syntax-quote work?
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    <p>Various special characters in clojure are abbreviations for things</p> <p><code>(quote (a b))</code> is the same as <code>'(a b)</code></p> <p>as you can see by evaluating:</p> <pre><code>user&gt; ''(a b) (quote (a b)) </code></pre> <p>This seems to be syntax as abbreviation, which strikes me as a fine idea.</p> <p>But the syntax-quote, ` , seems special. I can't think what would be equivalent to </p> <pre><code>`(a b) </code></pre> <p>I would have guessed something like <code>(syntax-quote (a b))</code> , but it doesn't work, and if I've just guessed wrong, I can't find out what it's really called.</p> <pre><code>user&gt; '`(a b) (clojure.core/seq (clojure.core/concat (clojure.core/list (quote user/a)) (clojure.core/list (quote user/b)))) </code></pre> <p>Is a bit mystifying.</p> <p>Presumably the reader's doing something special, maybe because it needs to know the namespaces?</p> <p>Interestingly, the special syntax used in the syntax-quote does work as I expected:</p> <pre><code>user&gt; '~a (clojure.core/unquote a) user&gt; '~@a (clojure.core/unquote-splicing a) user&gt; '~'a (clojure.core/unquote (quote a)) </code></pre> <p>except for this one:</p> <pre><code>user&gt; 'a# a# </code></pre> <p>Which I would have thought produced something like <code>(unquote (gensym "a"))</code></p> <p>I do realise that I'm being a bit feeble here, and should just go and read the code. If no-one fancies explaining what's going on or giving a reference, can anyone give me a hint about how to find the relevant code and what to look for?</p>
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    1. USJohn Lawrence Aspden
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