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Add LispArray instances and deep copy #1387

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Add LispArray instances and deep copy #1387

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50 changes: 49 additions & 1 deletion library/lisparray.lisp
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,9 @@
;;;; An interface to Common Lisp rank-1 SIMPLE-ARRAYs.

(coalton-library/utils:defstdlib-package #:coalton-library/lisparray
(:use #:coalton)
(:use
#:coalton
#:coalton-library/classes)
(:local-nicknames
(#:types #:coalton-library/types)
(#:complex #:coalton-library/math/complex))
Expand Down Expand Up @@ -84,6 +86,52 @@ WARNING: The consequences are undefined if an uninitialized element is read befo
(cl:setf (cl:aref v i) x)
Unit))

(inline)
(declare copy (LispArray :t -> LispArray :t))
(define (copy v)
"Make a deep copy of the `LispArray` `v`."
(lisp (LispArray :t) (v)
(cl:copy-seq v)))

(define-instance (types:RuntimeRepr :t => Into (List :t) (LispArray :t))
(inline)
(define (into xs)
(let ((type (types:runtime-repr (types:proxy-inner (types:proxy-of xs)))))
(lisp (LispArray :t) (xs type)
(cl:make-array (cl:length xs) :element-type type :initial-contents xs)))))

(define-instance (Into (LispArray :t) (List :t))
(inline)
(define (into v)
(let ((len (length v)))
(if (== 0 len)
Nil
(let ((%into (fn (xs i)
(if (== 0 i)
(Cons (aref v 0) xs)
(%into (Cons (aref v i) xs) (- i 1))))))
(%into Nil (- len 1)))))))

(define-instance (types:RuntimeRepr :t => Iso (LispArray :t) (List :t)))

(define-instance (Foldable LispArray)
(define (fold f init v)
(let ((len (length v))
(%fold (fn (i acc)
(if (== i len)
acc
(%fold (+ 1 i) (f acc (aref v i)))))))
(%fold 0 init)))

(define (foldr f init v)
(let len = (length v))
(when (== 0 len) (return init))
(let ((%foldr (fn (i acc)
(if (== i 0)
(f (aref v 0) acc)
(%foldr (- i 1) (f (aref v i) acc))))))
(%foldr (- len 1) init))))

(lisp-toplevel ()
(cl:eval-when (:compile-toplevel :load-toplevel)
(cl:defmacro define-lisparray-specialization (coalton-type lisp-type)
Expand Down