2013-11-29 05:53:02 +01:00
|
|
|
;;; Hy anaphoric macros
|
|
|
|
;;
|
|
|
|
;; Copyright (c) 2013 James King <james@agentultra.com>
|
2013-12-25 18:11:25 +01:00
|
|
|
;; 2013 Paul R. Tagliamonte <tag@pault.ag>
|
2013-12-25 20:18:09 +01:00
|
|
|
;; 2013 Abhishek L <abhishek.lekshmanan@gmail.com>
|
2013-11-29 05:53:02 +01:00
|
|
|
;;
|
|
|
|
;; 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.
|
|
|
|
;;
|
|
|
|
;;; These macros make writing functional programs more concise
|
|
|
|
|
|
|
|
|
2013-12-25 18:11:25 +01:00
|
|
|
(defmacro ap-if (test-form &rest args)
|
|
|
|
`(let [[it ~test-form]] (if it ~@args)))
|
|
|
|
|
|
|
|
|
2013-11-29 05:53:02 +01:00
|
|
|
(defmacro ap-each [lst &rest body]
|
2013-11-30 01:59:20 +01:00
|
|
|
"Evaluate the body form for each element in the list."
|
2013-12-31 19:35:31 +01:00
|
|
|
`(for [it ~lst] ~@body))
|
2013-11-29 05:53:02 +01:00
|
|
|
|
|
|
|
|
2013-11-30 01:59:20 +01:00
|
|
|
(defmacro ap-each-while [lst form &rest body]
|
|
|
|
"Evalutate the body form for each element in the list while the
|
|
|
|
predicate form evaluates to True."
|
|
|
|
`(let [[p (lambda [it] ~form)]]
|
2013-12-31 19:35:31 +01:00
|
|
|
(for [it ~lst]
|
2013-11-29 05:53:02 +01:00
|
|
|
(if (p it)
|
|
|
|
~@body
|
|
|
|
(break)))))
|
|
|
|
|
|
|
|
|
|
|
|
(defmacro ap-map [form lst]
|
2013-11-30 01:59:20 +01:00
|
|
|
"Yield elements evaluated in the form for each element in the list."
|
2014-04-18 02:45:05 +02:00
|
|
|
(let [[v (gensym 'v)] [f (gensym 'f)]]
|
|
|
|
`(let [[~f (lambda [it] ~form)]]
|
|
|
|
(for [~v ~lst]
|
|
|
|
(yield (~f ~v))))))
|
2013-11-29 05:53:02 +01:00
|
|
|
|
|
|
|
|
|
|
|
(defmacro ap-map-when [predfn rep lst]
|
2013-11-30 01:59:20 +01:00
|
|
|
"Yield elements evaluated for each element in the list when the
|
|
|
|
predicate function returns True."
|
2013-11-29 05:53:02 +01:00
|
|
|
`(let [[f (lambda [it] ~rep)]]
|
2013-12-31 19:35:31 +01:00
|
|
|
(for [it ~lst]
|
2013-11-30 16:30:42 +01:00
|
|
|
(if (~predfn it)
|
2013-11-29 05:53:02 +01:00
|
|
|
(yield (f it))
|
|
|
|
(yield it)))))
|
|
|
|
|
|
|
|
|
|
|
|
(defmacro ap-filter [form lst]
|
2013-11-30 01:59:20 +01:00
|
|
|
"Yield elements returned when the predicate form evaluates to True."
|
2013-11-29 05:53:02 +01:00
|
|
|
`(let [[pred (lambda [it] ~form)]]
|
2013-12-31 19:35:31 +01:00
|
|
|
(for [val ~lst]
|
2013-11-29 05:53:02 +01:00
|
|
|
(if (pred val)
|
|
|
|
(yield val)))))
|
2013-12-25 20:18:09 +01:00
|
|
|
|
|
|
|
|
|
|
|
(defmacro ap-reject [form lst]
|
|
|
|
"Yield elements returned when the predicate form evaluates to False"
|
|
|
|
`(ap-filter (not ~form) ~lst))
|
|
|
|
|
|
|
|
|
|
|
|
(defmacro ap-dotimes [n &rest body]
|
|
|
|
"Execute body for side effects `n' times, with it bound from 0 to n-1"
|
|
|
|
(unless (numeric? n)
|
|
|
|
(raise (TypeError (.format "{0!r} is not a number" n))))
|
|
|
|
`(ap-each (range ~n) ~@body))
|
|
|
|
|
|
|
|
|
|
|
|
(defmacro ap-first [predfn lst]
|
|
|
|
"Yield the first element that passes `predfn`"
|
|
|
|
`(let [[n (gensym)]]
|
|
|
|
(ap-each ~lst (when ~predfn (setv n it) (break)))
|
|
|
|
n))
|
|
|
|
|
|
|
|
|
|
|
|
(defmacro ap-last [predfn lst]
|
|
|
|
"Yield the last element that passes `predfn`"
|
|
|
|
`(let [[n (gensym)]]
|
|
|
|
(ap-each ~lst (none? n)
|
|
|
|
(when ~predfn
|
|
|
|
(setv n it)))
|
|
|
|
n))
|
|
|
|
|
|
|
|
|
|
|
|
(defmacro ap-reduce [form lst &optional [initial-value None]]
|
|
|
|
"Anaphoric form of reduce, `acc' and `it' can be used for a form"
|
|
|
|
(if (none? initial-value)
|
|
|
|
`(let [[acc (car ~lst)]]
|
|
|
|
(ap-each (cdr ~lst) (setv acc ~form))
|
|
|
|
acc)
|
|
|
|
`(let [[acc ~initial-value]]
|
|
|
|
(ap-each ~lst (setv acc ~form))
|
|
|
|
acc)))
|