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;;; Copyright 2024 Masaya Tojo <masaya@tojo.tokyo>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
(define-library (integer-partition accel-asc)
(export accel-asc)
(import (scheme base))
(cond-expand
((library (scheme generator))
(import (only (scheme generator) make-coroutine-generator)))
((library (srfi 158))
(import (only (srfi 158) make-coroutine-generator))))
(begin
(define-syntax while
(syntax-rules ()
((_ condition body body* ...)
(let loop ()
(if condition
(begin
body
body* ...
(loop))
(if #f #f)))))))
(begin
(define (accel-asc n)
(accel-asc* n vector-copy))
(define (accel-asc* n convert)
(make-coroutine-generator
(lambda (yield)
(let ((a (make-vector (+ n 1) 0))
(k 1)
(x 0)
(y (- n 1)))
(while (not (= k 0))
(set! x (+ (vector-ref a (- k 1)) 1))
(set! k (- k 1))
(while (<= (* 2 x) y)
(vector-set! a k x)
(set! y (- y x))
(set! k (+ k 1)))
(let ((l (+ k 1)))
(while (<= x y)
(vector-set! a k x)
(vector-set! a l y)
(yield (convert a 0 (+ k 2)))
(set! x (+ x 1))
(set! y (- y 1)))
(vector-set! a k (+ x y))
(set! y (+ x y -1))
(yield (convert a 0 (+ k 1)))))))))
))
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