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so smol

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Matthew Butterick 5 years ago
parent c1464441c6
commit 7a539a2b13
1 changed files with 24 additions and 21 deletions
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45
xenomorph/xenomorph/versioned-struct.rkt
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@ -17,9 +17,9 @@ https://github.com/mbutterick/restructure/blob/master/src/VersionedStruct.coffee
(unless (for/or ([proc (list integer? procedure? xenomorphic-type? symbol?)])
(proc @type))
(raise-argument-error '+xversioned-struct "integer, procedure, symbol, or xenomorphic" @type))
(raise-argument-error 'x:versioned-struct "integer, procedure, symbol, or xenomorphic" @type))
(unless (and (dict? @versions) (andmap (λ (v) (or (dict? v) (x:struct? v))) (dict-values @versions)))
(raise-argument-error '+xversioned-struct "dict of dicts or structish" @versions))
(raise-argument-error 'x:versioned-struct "dict of dicts or structish" @versions))
(define version-getter (cond
[(procedure? @type) @type]
@ -29,13 +29,13 @@ https://github.com/mbutterick/restructure/blob/master/src/VersionedStruct.coffee
[(procedure? @type) @type]
[(symbol? @type) (λ (parent version) (dict-set! parent @type version))]))
(define (extract-fields-dict val)
(define (select-field-set val)
(define version-key
(or (dict-ref val x:version-key #f)
(raise-argument-error 'xversioned-struct-encode "value for version key" x:version-key)))
(raise-argument-error 'x:versioned-struct-encode "value for version key" x:version-key)))
(define field-object
(or (dict-ref @versions version-key #f)
(raise-argument-error 'xversioned-struct-encode (format "valid field version: ~v" (dict-keys @versions)) version-key)))
(raise-argument-error 'x:versioned-struct-encode (format "valid field version: ~v" (dict-keys @versions)) version-key)))
(if (x:struct? field-object) (get-field fields field-object) field-object))
(define/override (x:decode port parent [length 0])
@ -44,25 +44,26 @@ https://github.com/mbutterick/restructure/blob/master/src/VersionedStruct.coffee
[(integer? @type) @type]
[(or (symbol? @type) (procedure? @type))
(unless parent
(raise-argument-error 'xversioned-struct-decode "valid parent" parent))
(raise-argument-error 'x:versioned-struct-decode "valid parent" parent))
(version-getter parent)]
[else (send @type x:decode port parent)]))
(dict-set! res x:version-key which-version)
(define maybe-header-val (dict-ref @versions 'header #f))
(when maybe-header-val
(parse-fields! port res maybe-header-val))
(cond
[(dict-ref @versions 'header #f) => (λ (header-val) (parse-fields! port res header-val))])
(define fields
(or (dict-ref @versions (dict-ref res x:version-key #f) #f)
(raise-argument-error 'xversioned-struct-decode "valid version key" (cons version @versions))))
(define field-object
(or (dict-ref @versions which-version #f)
(raise-argument-error 'x:versioned-struct-decode (format "valid field version: ~v" (dict-keys @versions)) which-version)))
(cond
[(x:versioned-struct? fields) (send fields x:decode port parent)]
[else (parse-fields! port res fields)]))
(if (x:versioned-struct? field-object)
(send field-object x:decode port parent)
(parse-fields! port res field-object)))
(define/override (x:encode encode-me port [parent-arg #f])
(unless (dict? encode-me)
(raise-argument-error 'xversioned-struct-encode "dict" encode-me))
(raise-argument-error 'x:versioned-struct-encode "dict" encode-me))
(define parent (mhash x:pointers-key null
x:start-offset-key (pos port)
x:parent-key parent-arg
@ -76,9 +77,9 @@ https://github.com/mbutterick/restructure/blob/master/src/VersionedStruct.coffee
(for ([(key type) (in-dict maybe-header-dict)])
(send type x:encode (dict-ref encode-me key) port parent)))
(define fields (extract-fields-dict encode-me))
(define fields (select-field-set encode-me))
(unless (andmap (λ (key) (member key (dict-keys encode-me))) (dict-keys fields))
(raise-argument-error 'xversioned-struct-encode (format "hash that contains superset of xversioned-struct keys: ~a" (dict-keys fields)) (hash-keys encode-me)))
(raise-argument-error 'x:versioned-struct-encode (format "hash that contains superset of xversioned-struct keys: ~a" (dict-keys fields)) (hash-keys encode-me)))
(for ([(key type) (in-dict fields)])
(send type x:encode (dict-ref encode-me key) port parent))
(for ([ptr (in-list (dict-ref parent x:pointers-key))])
@ -86,8 +87,10 @@ https://github.com/mbutterick/restructure/blob/master/src/VersionedStruct.coffee
(define/override (x:size [val #f] [parent-arg #f] [include-pointers #t])
(unless val
(raise-argument-error 'xversioned-struct-size "value" val))
(define parent (mhash x:parent-key parent-arg x:val-key val x:pointer-size-key 0))
(raise-argument-error 'x:versioned-struct-size "value" val))
(define parent (mhash x:parent-key parent-arg
x:val-key val
x:pointer-size-key 0))
(define version-size
(let ([struct-type @type])
(if (or (symbol? struct-type) (procedure? struct-type))
@ -97,7 +100,7 @@ https://github.com/mbutterick/restructure/blob/master/src/VersionedStruct.coffee
(for/sum ([(key type) (in-dict (or (dict-ref @versions 'header #f) null))])
(send type x:size (and val (dict-ref val key)) parent)))
(define fields-size
(for/sum ([(key type) (in-dict (extract-fields-dict val))])
(for/sum ([(key type) (in-dict (select-field-set val))])
(send type x:size (and val (dict-ref val key)) parent)))
(define pointer-size (if include-pointers (dict-ref parent x:pointer-size-key) 0))
(+ version-size header-size fields-size pointer-size))))

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