https://ask.clojure.org/index.php/tag/print-dup https://ask.clojure.org/index.php/9567/possible-create-tagged-literal-reader-for-clojure-core-vec <p>Is it not possible to create a tagged literal for a <code>clojure.core.Vec</code> (that result of the <code>vector-of</code> function)? Creating a reader function for such a tag is trivial, and it works well enough with <code>read-str</code> and EDN readers. But the REPL always winds up holding a <code>clojure.lang.PersistentVector</code>.</p> <hr> <p>This issue came about as I thrash around looking for a round-trip support for a hexstring of bytes with support for idiomatic Clojure (<code>clojure.lang.ISeq</code> and immutability are high priorities).</p> <ol> <li>Despite the promise of <code>(vector-of :byte ...)</code>, it's not possible to round trip the byte data cleanly with <code>clojure.core.Vec</code>.</li> <li>With a tag reader and print-dup writer I can get round-trip ability for JVM native byte arrays, but they don't support <code>clojure.lang.ISeq</code> and they're mutable.</li> <li>Regular vectors are heterogeneous and I can't safely appropriate <br> <code>print-dup</code> for them to achieve my goals.</li> </ol> <p>None of these options are attractive.</p> Syntax and reader https://ask.clojure.org/index.php/9567/possible-create-tagged-literal-reader-for-clojure-core-vec Thu, 03 Sep 2020 03:02:38 +0000