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macros.clj
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macros.clj
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;; The MIT License (MIT)
;;
;; Copyright (c) 2016 Richard Hull
;;
;; 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.
(ns infix.macros
(:require
[jasentaa.parser :refer [parse-all]]
[infix.core :refer [rewrite resolve-alias base-env]]
[infix.grammar :refer [expression]]))
(defmacro infix
"Takes an infix expression, resolves any aliases before rewriting the
infix expressions into standard LISP prefix expressions."
[& expr]
(->>
expr
(map resolve-alias)
rewrite))
;; Short alias for infix
(defmacro $=
"Takes an infix expression, resolves any aliases before rewriting the
infix expressions into standard LISP prefix expressions."
[& expr]
`(infix ~@expr))
(defn- binding-vars [bindings]
(->>
bindings
(map #(vector (keyword %) (gensym "arg_")))
(into {})))
(defmacro from-string
([expr]
`(from-string [] ~expr))
([bindings expr]
`(from-string ~bindings ~base-env ~expr))
([bindings env expr]
(cond
(not (vector? bindings))
(throw (IllegalArgumentException. "Binding variables is not a vector"))
:else
(let [b# (binding-vars bindings)
p# (mapv keyword bindings)]
`(if-let [f# (parse-all expression ~expr)]
(with-meta
(fn [~@(vals b#)]
(f# (merge ~env ~b#)))
{:doc ~expr :params ~p#}))))))