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(srfi 223). Finalize release 2.0.1.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| ;;; SRFI 223 | ||
| ;;; Generalized binary search procedures | ||
| ;;; | ||
| ;;; Generalized procedures for binary search of vector-like data structures are provided | ||
| ;;; which can be applied to any sequence type, including ones defined by the user, | ||
| ;;; together with applications of these procedures for Scheme’s built-in vector and | ||
| ;;; bytevector types. | ||
| ;;; | ||
| ;;; Copyright © 2021 Daphne Preston-Kendal. All rights reserved. | ||
| ;;; | ||
| ;;; Permission is hereby granted, free of charge, to any person obtaining a copy of this | ||
| ;;; software and associated documentation files (the "Software"), to deal in the Software | ||
| ;;; without restriction, including without limitation the rights to use, copy, modify, merge, | ||
| ;;; publish, distribute, sublicense, and/or sell copies of the Software, and to permit | ||
| ;;; persons to whom the Software is furnished to do so, subject to the following conditions: | ||
| ;;; | ||
| ;;; The above copyright notice and this permission notice shall be included in all copies or | ||
| ;;; substantial portions of the Software. | ||
| ;;; | ||
| ;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, | ||
| ;;; INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR | ||
| ;;; PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE | ||
| ;;; FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | ||
| ;;; OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | ||
| ;;; DEALINGS IN THE SOFTWARE. | ||
| ;;; | ||
| ;;; Adaptation to LispKit | ||
| ;;; Copyright © 2021 Matthias Zenger. All rights reserved. | ||
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| (define-library (srfi 223) | ||
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| (export bisection | ||
| bisect-left | ||
| bisect-right | ||
| vector-bisect-left | ||
| vector-bisect-right) | ||
|
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| (import (lispkit base)) | ||
|
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||
| (begin | ||
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| (define (bisect-left a val ref less? lo hi) | ||
| (if (>= lo hi) lo | ||
| (let ((mid (floor-quotient (+ lo hi) 2))) | ||
| (if (less? (ref a mid) val) | ||
| (bisect-left a val ref less? (+ mid 1) hi) | ||
| (bisect-left a val ref less? lo mid))))) | ||
|
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||
| (define (bisect-right a val ref less? lo hi) | ||
| (if (>= lo hi) lo | ||
| (let ((mid (floor-quotient (+ lo hi) 2))) | ||
| (if (less? val (ref a mid)) | ||
| (bisect-right a val ref less? lo mid) | ||
| (bisect-right a val ref less? (+ mid 1) hi))))) | ||
|
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||
| (define bisection | ||
| (case-lambda | ||
| ((ref lo-hi-proc) | ||
| (values | ||
| (case-lambda | ||
| ((a val less?) | ||
| (let-values (((lo hi) (lo-hi-proc a))) | ||
| (bisect-left a val ref less? lo hi))) | ||
| ((a val less? lo hi) | ||
| (bisect-left a val ref less? lo hi))) | ||
| (case-lambda | ||
| ((a val less?) | ||
| (let-values (((lo hi) (lo-hi-proc a))) | ||
| (bisect-right a val ref less? lo hi))) | ||
| ((a val less? lo hi) | ||
| (bisect-right a val ref less? lo hi))))) | ||
| ((ref) | ||
| (bisection ref | ||
| (lambda (a) | ||
| (error "both lo and hi arguments must be given to this procedure")))))) | ||
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| (define-values (vector-bisect-left vector-bisect-right) | ||
| (bisection vector-ref (lambda (v) (values 0 (vector-length v))))) | ||
| ) | ||
| ) |
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