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;; Copyright (c) Nicola Mometto, Rich Hickey & contributors.
;; 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.
(ns clojure.tools.analyzer.passes.trim)
(defmulti trim
"Trims the AST from duplicate :do nodes or useless :let nodes.
WARNING: Still experimental, possibly useful metadata-stored info
might get lost"
:op)
(defmethod trim :default [ast] ast)
(defmethod trim :do
[{:keys [statements ret] :as ast}]
(if (or (and (every? :literal? statements)
(:literal? ret))
(empty? statements))
ret
ast))
(defmethod trim :let
[{:keys [bindings body] :as ast}]
(if (and (every? (comp :literal? :init) bindings)
(:literal? body))
body
ast))
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