44 lines
1.5 KiB
Plaintext
44 lines
1.5 KiB
Plaintext
|
;; Copyright (c) 2009 Derick Eddington. All rights reserved.
|
||
|
|
;; Licensed under an MIT-style license. My license is in the file
|
||
|
|
;; named LICENSE from the original collection this file is distributed
|
||
|
|
;; with. If this file is redistributed with some other collection, my
|
||
|
|
;; license must also be included.
|
||
|
|
|
||
|
|
#!r6rs
|
||
|
|
(library (srfi s6 basic-string-ports)
|
||
|
|
(export
|
||
|
|
(rename (open-string-input-port open-input-string))
|
||
|
|
open-output-string
|
||
|
|
get-output-string)
|
||
|
|
(import
|
||
|
|
(rnrs)
|
||
|
|
(only (scheme base) make-weak-hasheq hash-ref hash-set!))
|
||
|
|
|
||
|
|
(define accumed-ht (make-weak-hasheq))
|
||
|
|
|
||
|
|
(define (open-output-string)
|
||
|
|
(letrec ([sop
|
||
|
|
(make-custom-textual-output-port
|
||
|
|
"string-output-port"
|
||
|
|
(lambda (string start count) ; write!
|
||
|
|
(when (positive? count)
|
||
|
|
(let ([al (hash-ref accumed-ht sop)])
|
||
|
|
(hash-set! accumed-ht sop
|
||
|
|
(cons (substring string start (+ start count)) al))))
|
||
|
|
count)
|
||
|
|
#f ; get-position TODO?
|
||
|
|
#f ; set-position! TODO?
|
||
|
|
#f #| closed TODO? |# )])
|
||
|
|
(hash-set! accumed-ht sop '())
|
||
|
|
sop))
|
||
|
|
|
||
|
|
(define (get-output-string sop)
|
||
|
|
(if (output-port? sop)
|
||
|
|
(cond [(hash-ref accumed-ht sop #f)
|
||
|
|
=> (lambda (al) (apply string-append (reverse al)))]
|
||
|
|
[else
|
||
|
|
(assertion-violation 'get-output-string "not a string-output-port" sop)])
|
||
|
|
(assertion-violation 'get-output-string "not an output-port" sop)))
|
||
|
|
|
||
|
|
)
|