You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
98 lines
3.7 KiB
Racket
98 lines
3.7 KiB
Racket
#lang debug racket/base
|
|
(require racket/class racket/dict racket/match)
|
|
(provide (all-defined-out))
|
|
|
|
(struct x:ptr (type val parent) #:transparent)
|
|
|
|
(define x:version-key 'x:version)
|
|
(define x:start-offset-key 'x:start-offset)
|
|
(define x:current-offset-key 'x:current-offset)
|
|
(define x:length-key 'x:length)
|
|
(define x:parent-key 'x:parent)
|
|
(define x:pointer-size-key 'x:ptr-size)
|
|
(define x:pointers-key 'x:pointers)
|
|
(define x:pointer-offset-key 'x:ptr-offset) ;; formerly pointerOffset
|
|
(define x:pointer-type-key 'x:ptr-type)
|
|
(define x:val-key 'x:val)
|
|
|
|
(define private-keys (list x:parent-key x:start-offset-key x:current-offset-key x:length-key x:pointer-size-key
|
|
x:pointers-key x:pointer-offset-key x:pointer-type-key x:val-key))
|
|
|
|
(define (dict->mutable-hash x)
|
|
(define h (make-hasheq))
|
|
(for ([(k v) (in-dict x)]
|
|
#:unless (memq k private-keys))
|
|
(hash-set! h k v))
|
|
h)
|
|
|
|
(define (hash-ref* d . keys)
|
|
(for/fold ([d d])
|
|
([k (in-list keys)])
|
|
(hash-ref d k)))
|
|
|
|
(define (pos p [new-pos #f])
|
|
(when new-pos
|
|
(file-position p new-pos))
|
|
(file-position p))
|
|
|
|
#|
|
|
We make `parent` a kwarg so that we can pass it without necessitating an explicit port-arg. (Meaning, if it's positional, whenever we want to use it, we also have to make port-arg explicit, which is boring.)
|
|
|
|
We don't make port-arg a kwarg because it's the most common arg passed.
|
|
|
|
We don't make port-arg the last arg (similar to other Racket port funcs) because we want to let the functions be variable arity.
|
|
|#
|
|
(define (decode xo [port-arg (current-input-port)] #:parent [parent #f] . args)
|
|
(define port
|
|
(cond
|
|
[(input-port? port-arg) port-arg]
|
|
[(bytes? port-arg) (open-input-bytes port-arg)]
|
|
[else (raise-argument-error 'decode "byte string or input port" port-arg)]))
|
|
(send xo x:decode port parent . args))
|
|
|
|
(define (encode xo val [port-arg (current-output-port)]
|
|
#:parent [parent #f]
|
|
. args)
|
|
(define port (if (output-port? port-arg) port-arg (open-output-bytes)))
|
|
(send xo x:encode val port parent . args)
|
|
(unless port-arg (get-output-bytes port)))
|
|
|
|
(define (xenomorphic-type? x) (is-a? x x:base%))
|
|
(define xenomorphic? xenomorphic-type?)
|
|
|
|
(define-syntax-rule (generate-subclass CLASS PRE-ENCODE-PROC POST-DECODE-PROC)
|
|
(cond
|
|
[(and PRE-ENCODE-PROC POST-DECODE-PROC)
|
|
(class CLASS
|
|
(super-new)
|
|
(define/override (pre-encode x) (super pre-encode (PRE-ENCODE-PROC x)))
|
|
(define/override (post-decode x) (POST-DECODE-PROC (super post-decode x))))]
|
|
[PRE-ENCODE-PROC
|
|
(class CLASS
|
|
(super-new)
|
|
(define/override (pre-encode x) (super pre-encode (PRE-ENCODE-PROC x))))]
|
|
[POST-DECODE-PROC
|
|
(class CLASS
|
|
(super-new)
|
|
(define/override (post-decode x) (POST-DECODE-PROC (super post-decode x))))]
|
|
[else CLASS]))
|
|
|
|
(define x:base%
|
|
(class object%
|
|
(super-new)
|
|
|
|
(define/pubment (x:decode input-port [parent #f] . args)
|
|
(post-decode (inner (error 'xenomorph (format "decode not augmented in ~a" this)) x:decode input-port parent . args)))
|
|
|
|
(define/pubment (x:encode val output-port [parent #f] . args)
|
|
(match (inner (error 'xenomorph (format "encode not augmented in ~a" this)) x:encode (pre-encode val) output-port parent . args)
|
|
[(? bytes? encode-result) (write-bytes encode-result output-port)]
|
|
[other other]))
|
|
|
|
(define/pubment (x:size [val #f] [parent #f] . args)
|
|
(match (inner 0 x:size val parent . args)
|
|
[(? exact-nonnegative-integer? size) size]
|
|
[other (raise-result-error 'size "nonnegative integer" other)]))
|
|
|
|
(define/public (post-decode val) val)
|
|
(define/public (pre-encode val) val))) |