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1 ;;; apply_macro.clj: make macros behave like functions
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2
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3 ;; by Stuart Sierra, http://stuartsierra.com/
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4 ;; January 28, 2009
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5
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6 ;; Copyright (c) Stuart Sierra, 2009. All rights reserved. The use
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7 ;; and distribution terms for this software are covered by the Eclipse
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8 ;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
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9 ;; which can be found in the file epl-v10.html at the root of this
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10 ;; distribution. By using this software in any fashion, you are
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11 ;; agreeing to be bound by the terms of this license. You must not
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12 ;; remove this notice, or any other, from this software.
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13
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14
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15 ;; Don't use this. I mean it. It's evil. How evil? You can't
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16 ;; handle it, that's how evil it is. That's right. I did it so you
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17 ;; don't have to, ok? Look but don't touch. Use this lib and you'll
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18 ;; go blind.
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19
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20 ;; DEPRECATED in 1.2 with no replacement.
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21
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22 (ns ^{:deprecated "1.2"}
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23 clojure.contrib.apply-macro)
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24
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25 ;; Copied from clojure.core/spread, which is private.
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26 (defn- spread
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27 "Flatten final argument list as in apply."
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28 [arglist]
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29 (cond
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30 (nil? arglist) nil
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31 (nil? (rest arglist)) (seq (first arglist))
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32 :else (cons (first arglist) (spread (rest arglist)))))
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33
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34 (defmacro apply-macro
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35 "This is evil. Don't ever use it. It makes a macro behave like a
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36 function. Seriously, how messed up is that?
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37
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38 Evaluates all args, then uses them as arguments to the macro as with
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39 apply.
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40
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41 (def things [true true false])
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42 (apply-macro and things)
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43 ;; Expands to: (and true true false)"
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44 [macro & args]
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45 (cons macro (spread (map eval args))))
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