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Ed Langley
2018-11-06 00:41:32 -08:00
parent ca2332cc98
commit f7f7b3e6cc
2 changed files with 111 additions and 12 deletions
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3
data-lens.asd
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@ -2,7 +2,8 @@
:description "Utilities for building data transormations from composable functions, modeled on lenses and transducers"
:author "Edward Langley <edward@elangley.org>"
:license "MIT"
:depends-on (cl-ppcre)
:depends-on (cl-ppcre
alexandria)
:serial t
:components ((:file "lens")))

114
lens.lisp
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@ -8,9 +8,35 @@
#:extract-key
#:element
#:let-fn
#:juxt))
#:juxt
#:transform-tail
#:slice
#:compress-runs
#:combine-matching-lists
#:sorted
#:applicable-when
#:of-length
#:of-min-length
#:of-max-length
#:transform-head
#:maximizing
#:zipping))
(in-package :data-lens)
(declaim
(inline data-lens:over
data-lens:transform-tail
data-lens:applicable-when
data-lens:of-min-length
data-lens:on
data-lens:over
data-lens:slice
data-lens:compress-runs
data-lens:combine-matching-lists
data-lens:juxt
data-lens:element
data-lens:sorted))
(defmacro shortcut (name function &body bound-args)
`(eval-when (:load-toplevel :compile-toplevel :execute)
(setf (fdefinition ',name)
@ -72,6 +98,27 @@
it
:initial-value ()))))
(defun-ct of-length (len)
(lambda (it)
(= (length it)
len)))
(defun-ct of-min-length (len)
(lambda (it)
(>= (length it)
len)))
(defun-ct of-max-length (len)
(lambda (it)
(>= (length it)
len)))
(defun-ct applicable-when (fun test)
(lambda (it)
(if (funcall test it)
(funcall fun it)
it)))
(defun-ct sorted (comparator &rest r &key key)
(declare (ignore key))
(lambda (it)
@ -106,6 +153,11 @@
(lambda (it)
(subseq it start end)))
(defun-ct transform-head (fun)
(lambda (it)
(list* (funcall fun (car it))
(cdr it))))
(defun-ct transform-tail (fun)
(lambda (it)
(list* (car it)
@ -117,20 +169,28 @@
(funcall key-set
(funcall fun key-val)))))
(defun-ct juxt (fun1 fun2)
(lambda (item)
(list (funcall fun1 item)
(funcall fun2 item))))
(defun-ct juxt (fun1 fun2 &rest r)
(lambda (&rest args)
(list* (apply fun1 args)
(apply fun2 args)
(when r
(mapcar (lambda (f)
(apply f args))
r)))))
(defun-ct derive (diff-fun &key (key #'identity))
(lambda (list)
(cons (cons nil (car list))
(mapcar (lambda (next cur)
(cons (funcall diff-fun (funcall key next) (funcall key cur))
(cons (funcall diff-fun
(funcall key next)
(funcall key cur))
next))
(cdr list)
list)))
list))))
(defun-ct cumsum (&key (add-fun #'+) (key #'identity) (combine (lambda (x y) y x)) (zero 0))
(defun-ct cumsum
(&key (add-fun #'+) (key #'identity) (combine (lambda (x y) y x)) (zero 0))
(lambda (seq)
(nreverse
(reduce (lambda (accum next)
@ -152,3 +212,41 @@
(defun-ct on (fun key)
(lambda (it)
(funcall fun (funcall key it))))
(defun filler (length1 length2 fill-value)
(if (< length1 length2)
(make-sequence 'vector (- length2 length1) :initial-element fill-value)
#()))
(defun-ct zipping (result-type &key (fill-value nil fill-value-p))
(lambda (seq1 seq2)
(let ((length1 (when fill-value-p (length seq1)))
(length2 (when fill-value-p (length seq2))))
(let ((seq1 (if fill-value-p
(concatenate result-type
seq1
(filler length1 length2 fill-value))
seq1))
(seq2 (if fill-value-p
(concatenate result-type
seq2
(filler length2 length1 fill-value))
seq2)))
(map result-type #'list
seq1 seq2)))))
(defun-ct maximizing (relation measure)
(lambda (it)
(let ((it-length (length it)))
(when (> it-length 0)
(values-list
(reduce (fw.lu:destructuring-lambda ((cur-max max-idx)
(next next-idx))
(if (funcall relation
(funcall measure cur-max)
(funcall measure next))
(list next next-idx)
(list cur-max max-idx)))
(funcall (zipping 'vector)
it
(alexandria:iota it-length))))))))