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;;; Chickadee Game Toolkit
;;; Copyright © 2017 David Thompson <davet@gnu.org>
;;;
;;; Chickadee is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published
;;; by the Free Software Foundation, either version 3 of the License,
;;; or (at your option) any later version.
;;;
;;; Chickadee is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (chickadee array-list)
#:use-module (ice-9 format)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-9 gnu)
#:use-module (srfi srfi-43)
#:export (make-array-list
array-list
array-list?
array-list-empty?
array-list-size
array-list-ref
array-list-set!
array-list-push!
array-list-pop!
array-list-clear!
array-list-for-each))
(define-record-type <array-list>
(%make-array-list vector size)
array-list?
(vector array-list-vector set-array-list-vector!)
(size array-list-size set-array-list-size!))
(define (display-array-list array-list port)
(display "<array-list" port)
(array-list-for-each (lambda (i item)
(display " " port)
(display item port))
array-list)
(display ">" port))
(set-record-type-printer! <array-list> display-array-list)
(define (make-array-list)
(%make-array-list (make-vector 32) 0))
(define (array-list . items)
(let ((l (make-array-list)))
(for-each (lambda (item)
(array-list-push! l item))
items)
l))
(define (array-list-capacity array-list)
(vector-length (array-list-vector array-list)))
(define (array-list-full? array-list)
(= (array-list-size array-list)
(array-list-capacity array-list)))
(define (array-list-empty? array-list)
(zero? (array-list-size array-list)))
(define (expand-array-list! array-list)
(let* ((old-vec (array-list-vector array-list))
(new-size (* (vector-length old-vec) 2))
(new-vec (make-vector new-size)))
(vector-copy! new-vec 0 old-vec)
(set-array-list-vector! array-list new-vec)))
(define (array-list-ref array-list i)
(vector-ref (array-list-vector array-list) i))
(define (array-list-set! array-list i x)
(vector-set! (array-list-vector array-list) i x))
(define (array-list-push! array-list item)
(when (array-list-full? array-list)
(expand-array-list! array-list))
(let ((index (array-list-size array-list)))
(set-array-list-size! array-list (1+ index))
(array-list-set! array-list index item)))
(define (array-list-pop! array-list)
(let* ((index (1- (array-list-size array-list)))
(item (array-list-ref array-list index)))
(set-array-list-size! array-list index)
item))
(define (array-list-clear! array-list)
(set-array-list-size! array-list 0)
*unspecified*)
(define (array-list-for-each proc array-list)
(let ((size (array-list-size array-list))
(vec (array-list-vector array-list)))
(let loop ((i 0))
(when (< i size)
(proc i (vector-ref vec i))
(loop (1+ i))))))
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