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;;; bytestructures --- Structured access to bytevector contents.
;; Copyright © 2015, 2016 Taylan Kammer <taylan.kammer@gmail.com>
;; This program 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.
;; This program 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/>.
;;; Commentary:
;; This is the base of the module, defining the data types and procedures that
;; make up the bytestructures framework.
;;; Code:
;;; Descriptors
(drt <bsd>
(%mkbsd size align unwrap getter setter meta)
bsd?
(size bsize)
(align balign)
(unwrap bunwrp)
(getter bgettr)
(setter bsettr)
(meta bmeta))
(define mkbsd
(clmbda
((size align unwrap getter setter)
(%mkbsd
size align unwrap getter setter #f))
((size align unwrap getter setter meta)
(%mkbsd
size align unwrap getter setter meta))))
(define bdsz
(clmbda
((dscr) (bdsz dscr #f #f))
((dscr bvec offset)
(let ((size (bsize dscr)))
(if (proc? size)
(size #f bvec offset)
size)))))
(define (bdsz/s bvec offset dscr)
(let ((size (bsize dscr)))
(if (proc? size)
(size #t bvec offset)
size)))
;;; Bstrs
(drt <bstr>
(mkbstr bvec offset dscr)
bstr?
(bvec bsbvec)
(offset bsofst)
(dscr bsdscr))
(define bstr
(clmbda ((dscr) (%bstr dscr #f #f))
((dscr values) (%bstr dscr #t values))))
(define (%bstr dscr init? values)
(let ((bvec (mkbvec
(bdsz dscr))))
(when init?
(bspst! bvec 0 dscr values))
(mkbstr bvec 0 dscr)))
(define (bssize bstr)
(bdsz (bsdscr bstr)
(bsbvec bstr)
(bsofst bstr)))
(dsr (bsunwp <bstr> <indx> ...)
(let ((bstr <bstr>))
(let ((bvec (bsbvec bstr))
(offset (bsofst bstr))
(dscr (bsdscr bstr)))
(bsunwp bvec offset dscr <indx> ...))))
(defsyn bsnwp*
(synrul ()
((_ <bvec> <ofst> <dscr>)
(values <bvec> <ofst> <dscr>))
((_ <bvec> <ofst> <dscr> <indx> <idxs> ...)
(let ((bvec <bvec>)
(offset <ofst>)
(dscr <dscr>))
(let ((unwrap (bunwrp dscr)))
(when (not unwrap)
(error "cannot" dscr))
(letvls (((bvec* ofst* dscr*)
(unwrap #f bvec offset <indx>)))
(bsnwp*
bvec* ofst* dscr* <idxs> ...)))))))
(defsyr (bsref <bstr> <indx> ...)
(letvls (((bvec offset dscr)
(bsunwp <bstr> <indx> ...)))
(bspref bvec offset dscr)))
(defsyr (bsref*
<bvec> <ofst> <dscr> <indx> ...)
(letvls (((bvec offset dscr)
(bsnwp*
<bvec> <ofst> <dscr> <indx> ...)))
(bspref bvec offset dscr)))
(define (bspref bvec offset dscr)
(let ((getter (bdgtr dscr)))
(if getter
(getter #f bvec offset)
(mkbstr bvec offset dscr))))
(defsyr (bsst! <bstr> <indx> ... <valu>)
(letvls (((bvec offset dscr)
(bsunwp <bstr> <indx> ...)))
(bsps! bvec offset dscr <valu>)))
(defsyr (bsst!*
<bvec> <ofst> <dscr> <indx> ... <valu>)
(letvls (((bvec offset dscr)
(bsnwp*
<bvec> <ofst> <dscr> <indx> ...)))
(bspst! bvec offset dscr <valu>)))
(define (bspst! bvec offset dscr value)
(let ((setter (bdstr dscr)))
(if setter
(setter #f bvec offset value)
(if (bvec? value)
(bvecop bvec offset value 0
(bdsz
dscr bvec offset))
(error "cannot"
value dscr)))))
(define (bsrf/d bstr . indxs)
(letvls (((bvec offset dscr)
(bsunwp bstr)))
(let loop ((bvec bvec)
(offset offset)
(dscr dscr)
(indxs indxs))
(if (null? indxs)
(bspref bvec offset dscr)
(letvls (((bvec* ofst* dscr*)
(bsnwp*
bvec offset dscr (car indxs))))
(loop bvec*
ofst*
dscr*
(cdr indxs)))))))
(define (bst!/d bstr . args)
(letvls (((bvec offset dscr)
(bsunwp bstr)))
(let loop ((bvec bvec)
(offset offset)
(dscr dscr)
(args args))
(if (null? (cdr args))
(bset! bvec offset dscr (car args))
(letvls (((bvec* ofst* dscr*)
(bsnwp*
bvec offset dscr (car args))))
(loop bvec*
ofst*
dscr*
(cdr args)))))))
(defsyn
bnwp/s
bref/s
bset/s
dba)
(cexp
(guile (incfp "bstrs"))
(syncas (incld "base"))
(else))
;;; base.scm ends here
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