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feat(transducer): implement COMPRESSING-RUNS, add one-arity rf

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This commit is contained in:
Edward
2020-12-31 17:40:58 -08:00
parent d232497011
commit 1259838639
1 changed files with 125 additions and 55 deletions
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180
transducers.lisp
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@ -27,32 +27,64 @@
exit-early taking dropping transduce
hash-table-builder vector-builder list-builder))
(defmacro define-functional-transducer (name () &body body)
`(defun ,name (function &rest args)
(flet ((call-function (it) (apply function it args)))
(lambda (rf)
(lambda (acc next)
,@body)))))
(defmacro transducer-lambda (&body (((two-arg-acc two-arg-next) &body two-arg-body)
&optional (((one-arg-arg) &body one-arg-body)
'((it) it))))
(alexandria:with-gensyms (arg1 arg2 next-sym-p)
`(lambda (,arg1 &optional (,arg2 nil ,next-sym-p))
(if ,next-sym-p
(let ((,two-arg-acc ,arg1)
(,two-arg-next ,arg2))
,@two-arg-body)
(let ((,one-arg-arg ,arg1))
,@one-arg-body)))))
(define-functional-transducer mapping ()
(funcall rf acc (call-function next)))
(define-functional-transducer mv-mapping ()
(funcall rf acc (multiple-value-list (call-function next))))
(defun mapping (function &rest args)
(flet ((call-function (it)
(apply function it args)))
(lambda (rf)
(transducer-lambda
((acc next)
(funcall rf acc (call-function next)))
((it) (funcall rf it))))))
(define-functional-transducer mv-selecting ()
(multiple-value-bind (value use-p) (call-function next)
(if use-p
(funcall rf acc value)
acc)))
(defun mv-mapping (function &rest args)
(flet ((call-function (it)
(apply function it args)))
(lambda (rf)
(transducer-lambda
((acc next)
(funcall rf acc
(multiple-value-list (call-function next))))
((it) (funcall rf it))))))
(defun mv-selecting (function &rest args)
(flet ((call-function (it)
(apply function it args)))
(lambda (rf)
(transducer-lambda
((acc next)
(multiple-value-bind (value use-p)
(call-function next)
(if use-p
(funcall rf acc value)
acc)))
((it) (funcall rf it))))))
(defun hash-table-select (hash-table)
(mv-selecting #'gethash hash-table))
(define-functional-transducer filtering ()
(if (call-function next)
(funcall rf acc next)
acc))
(defun filtering (function &rest args)
(flet ((call-function (it)
(apply function it args)))
(lambda (rf)
(transducer-lambda
((acc next)
(if (call-function next)
(funcall rf acc next)
acc))
((it) (funcall rf it))))))
(defun mv-filtering (function &rest args)
(filtering (lambda (it)
@ -61,16 +93,45 @@
(defun deduping (&optional (test 'eql))
(lambda (rf)
(let (last)
(lambda (acc next)
(prog1 (if (funcall test last next)
acc
(funcall rf acc next))
(setf last next))))))
(transducer-lambda
((acc next)
(prog1 (if (or (null last)
(funcall test last next))
acc
(funcall rf acc next))
(setf last next)))
((it) (funcall rf it))))))
(defun seq (a b) a b)
(defun compressing-runs (&optional (test 'eql) (combiner 'seq))
(lambda (rf)
(let (last leftovers)
(transducer-lambda
((acc next)
(if (or (null last)
(funcall test last next))
(progn (setf last (funcall combiner last next)
leftovers t)
acc)
(progn (prog1 (funcall rf acc last)
(setf last next)))))
((it)
(funcall rf
(if leftovers
(funcall rf it last)
it)))))))
(defun catting ()
(lambda (rf)
(lambda (acc next)
(reduce rf next :initial-value acc))))
(transducer-lambda
((acc next)
(reduce rf next :initial-value acc))
((it) (funcall rf it)))))
(defun mapcatting (fun)
(data-lens:• (mapping fun)
(catting)))
(defun splitting (&rest functions)
(let ((splitter (apply #'data-lens:juxt functions)))
@ -82,27 +143,33 @@
(defun taking (n)
(lambda (rf)
(let ((taken 0))
(lambda (acc next)
(incf taken)
(if (< taken n)
(funcall rf acc next)
(exit-early (funcall rf acc next)))))))
(transducer-lambda
((acc next)
(incf taken)
(if (<= taken n)
(funcall rf acc next)
(exit-early acc)))
((it) (funcall rf it))))))
(defun dropping (n)
(lambda (rf)
(let ((taken 0))
(lambda (acc next)
(if (< taken n)
(progn (incf taken)
acc)
(funcall rf acc next))))))
(transducer-lambda
((acc next)
(if (< taken n)
(progn (incf taken)
acc)
(funcall rf acc next)))
((it) (funcall rf it))))))
(defun transduce (xf build seq)
(unwrap build
(catch 'done
(reduce-generic seq
(funcall xf (stepper build))
(init build)))))
(let ((transducer (funcall xf (stepper build))))
(unwrap build
(funcall transducer
(catch 'done
(reduce-generic seq
transducer
(init build)))))))
(defun eduction (xf seq)
(lambda (build)
(unwrap
@ -115,17 +182,19 @@
(defmethod init ((it (eql 'hash-table-builder)))
(make-hash-table))
(defmethod stepper ((it (eql 'hash-table-builder)))
(lambda (acc next)
(destructuring-bind (k v) next
(setf (gethash k acc) v))
acc))
(transducer-lambda
((acc next)
(destructuring-bind (k v) next
(setf (gethash k acc) v))
acc)))
(defmethod init ((it (eql 'vector-builder)))
(make-array 0 :fill-pointer t :adjustable t))
(defmethod stepper ((it (eql 'vector-builder)))
(lambda (acc next)
(vector-push-extend next acc)
acc))
(transducer-lambda
((acc next)
(vector-push-extend next acc)
acc)))
(defmethod init ((it (eql 'list-builder)))
(declare (optimize (speed 3)))
@ -133,13 +202,14 @@
(coerce (vector it it)
'(simple-array list (2)))))
(defmethod stepper ((it (eql 'list-builder)))
(lambda (acc a)
(declare (optimize (speed 3))
(type (simple-array list (2)) acc))
(let* ((to-build (elt acc 1)))
(push a (cdr to-build))
(setf (elt acc 1) (cdr to-build)))
acc))
(transducer-lambda
((acc a)
(declare (optimize (speed 3))
(type (simple-array list (2)) acc))
(let* ((to-build (elt acc 1)))
(push a (cdr to-build))
(setf (elt acc 1) (cdr to-build)))
acc)))
(defmethod unwrap ((it (eql 'list-builder)) obj)
(cdr (elt obj 0)))