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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | ;;; Hy AST walker
;;
;; Copyright (c) 2014, 2015 Gergely Nagy <algernon@madhouse-project.org>
;;
;; Permission is hereby granted, free of charge, to any person obtaining a
;; copy of this software and associated documentation files (the "Software"),
;; to deal in the Software without restriction, including without limitation
;; the rights to use, copy, modify, merge, publish, distribute, sublicense,
;; and/or sell copies of the Software, and to permit persons to whom the
;; Software is furnished to do so, subject to the following conditions:
;;
;; The above copyright notice and this permission notice shall be included in
;; all copies or substantial portions of the Software.
;;
;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
;; THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
;; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
;; DEALINGS IN THE SOFTWARE.
(import [hy [HyExpression HyDict]]
[functools [partial]])
(defn walk [inner outer form]
"Traverses form, an arbitrary data structure. Applies inner to each
element of form, building up a data structure of the same type.
Applies outer to the result."
(cond
[(instance? HyExpression form)
(outer (HyExpression (map inner form)))]
[(instance? HyDict form)
(HyDict (outer (HyExpression (map inner form))))]
[(cons? form)
(outer (cons (inner (first form))
(inner (rest form))))]
[(instance? list form)
((type form) (outer (HyExpression (map inner form))))]
[(coll? form)
(walk inner outer (list form))]
[True (outer form)]))
(defn postwalk [f form]
"Performs depth-first, post-order traversal of form. Calls f on each
sub-form, uses f's return value in place of the original."
(walk (partial postwalk f) f form))
(defn prewalk [f form]
"Performs depth-first, pre-order traversal of form. Calls f on each
sub-form, uses f's return value in place of the original."
(walk (partial prewalk f) identity (f form)))
(defn macroexpand-all [form]
"Recursively performs all possible macroexpansions in form."
(prewalk (fn [x]
(if (instance? HyExpression x)
(macroexpand x)
x))
form))
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