Created
August 7, 2009 14:13
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; The use and distribution terms for this software are covered by the | |
; Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php) | |
; which can be found in the file epl-v10.html at the root of this distribution. | |
; By using this software in any fashion, you are agreeing to be bound by | |
; the terms of this license. | |
; You must not remove this notice, or any other, from this software. | |
(def *splice-allowed* false) | |
(def *sq-gensyms* nil) | |
(defn is-call? [operator form] | |
(and (seq? form) (= (first form) operator))) | |
(defn maybe-resolve [sym] | |
(let [dot-end (.endsWith (name sym) ".") | |
sym (if dot-end | |
(symbol (subs (name sym) 0 (dec (count (name sym))))) | |
sym) | |
res (resolve sym)] | |
(cond | |
(var? res) (symbol (str (.ns res)) (str (.sym res))) | |
(class? res) (symbol (str (.getName res) (when (.endsWith (str sym) ".") "."))) | |
(.startsWith (name sym) ".") sym | |
:else (symbol (str (ns-name *ns*)) (str (name sym)))))) | |
(defn syntax-quote* | |
[form] | |
(letfn [(w | |
([form] | |
(list 'clojure.core/list form)) | |
([quote? form] | |
(list 'clojure.core/list (list 'quote form)))) | |
(process-seq | |
[form & splicable?] | |
(binding [*splice-allowed* splicable?] | |
(list* 'clojure.core/concat (map syntax-quote* form)))) | |
(process-sym | |
[sym] | |
(if-not (.endsWith (name sym) "#") | |
(maybe-resolve sym) | |
(if-let [auto (*sq-gensyms* (name sym))] | |
auto | |
(let [new-sym | |
(gensym (apply str (concat (butlast (name sym)) "__auto__")))] | |
(alter-var-root #'*sq-gensyms* assoc (name sym) new-sym) | |
new-sym))))] | |
(cond | |
(is-call? 'clojure.core/unquote form) | |
, (w (second form)) | |
(is-call? 'clojure.core/unquote-splicing form) | |
, (if *splice-allowed* | |
(list* 'do (rest form)) | |
(throw (IllegalStateException. "Splice not in sequential collection"))) | |
(is-call? 'syntax-quote form) (w :q form) | |
(symbol? form) (w :q (process-sym form)) | |
(vector? form) (w (list 'clojure.core/vec (process-seq form :splicable))) | |
(map? form) (w (list 'clojure.core/apply 'clojure.core/hash-map | |
(process-seq (apply concat (seq form))))) | |
(set? form) (w (list 'clojure.core/set (process-seq form :splicable))) | |
(seq? form) (w (process-seq form :splicable)) | |
:else (w (list 'quote form))))) | |
(defmacro syntax-quote [form] | |
(binding [*sq-gensyms* {}] | |
(list 'clojure.core/first (doall (syntax-quote* form))))) | |
;; example | |
(syntax-quote (fn [foo#] foo# ~x)) | |
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