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#lang racket/base
( require " helper.rkt " " util.rkt " )
( provide ( all-defined-out ) )
#|
approximates
https://github.com/mbutterick/restructure/blob/master/src/Reserved.coffee
|#
( define ( xreserved-decode xo [ port-arg ( current-input-port ) ] #:parent [ parent #f ] )
( define port ( ->input-port port-arg ) )
( pos port ( + ( pos port ) ( size xo #f #:parent parent ) ) )
( void ) )
( define ( xreserved-encode xo val [ port-arg ( current-output-port ) ] #:parent [ parent #f ] )
( define port ( if ( output-port? port-arg ) port-arg ( open-output-bytes ) ) )
( write-bytes ( make-bytes ( size xo val #:parent parent ) 0 ) port )
( unless port-arg ( get-output-bytes port ) ) )
( define ( xreserved-size xo [ val ] #:parent [ parent #f ] )
( define item-size ( size ( xreserved-type xo ) ) )
( define count ( resolve-length ( xreserved-count xo ) #f #:parent parent ) )
( finalize-size ( * item-size count ) ) )
( struct xreserved ( type count ) #:transparent
#:methods gen:xenomorphic
[ ( define decode xreserved-decode )
( define encode xreserved-encode )
( define size xreserved-size ) ] )
( define ( +xreserved type [ count 1 ] )
( xreserved type count ) )