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54 lines
1.7 KiB
Racket
54 lines
1.7 KiB
Racket
#lang debug racket/base
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(require racket/class racket/list xenomorph/pointer xenomorph/base "cff-struct.rkt")
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(provide CFFPointer CFFPointer%)
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#|
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approximates
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https://github.com/mbutterick/fontkit/blob/master/src/cff/CFFPointer.js
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|#
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(define (CFFPointer type
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#:relative-to [relative-to 'global]
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#:lazy [lazy #false])
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(x:pointer #:type type
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#:base-class CFFPointer%
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#:relative-to relative-to
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#:lazy lazy))
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(define CFFPointer%
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(class x:pointer%
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(super-new)
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(inherit/super [%encode encode])
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(inherit-field type offset-type)
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(define/override (decode stream parent operands)
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(set! offset-type (make-object
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(class x:base%
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(super-new)
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(define/augment (decode . args) (first operands)))))
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(super decode stream parent))
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(override [@encode encode])
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(define (@encode value stream ctx)
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#R 'entering=cff-pointer-encode
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(cond
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[(not stream)
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;; compute the size (so ctx.pointerSize is correct)
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(set! offset-type (make-object
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(class x:base%
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(super-new)
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(define/augment (size . args) 0))))
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(send this size value ctx)
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(list (Ptr 0))]
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[else
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(define ptr #false)
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(set! offset-type (make-object
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(class x:base%
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(super-new)
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(define/augment (encode val stream . _) (set! ptr val)))))
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(pointer-encode this value stream ctx)
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(list (Ptr ptr))]))))
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