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50 lines
1.6 KiB
Racket
50 lines
1.6 KiB
Racket
#lang fontkit/racket
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(require "ot-processor.rkt")
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(provide (all-defined-out))
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#|
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approximates
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https://github.com/mbutterick/fontkit/blob/master/src/opentype/GlyphInfo.js
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|#
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(define-subclass object% (GlyphInfo font-in id-in [codePoints-in empty] [features-in (mhasheq)])
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(field [_font font-in]
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[codePoints codePoints-in]
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[_id id-in]
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[features (mhasheq)])
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(cond
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[(list? features-in)
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(for ([feature (in-list features-in)])
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(hash-set! features feature #t))]
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[(dict? features-in)
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(for ([(feature val) (in-dict features-in)])
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(hash-set! features feature val))])
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(field [ligatureID #f]
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[ligatureComponent #f]
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[ligated #f]
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[isLigated #f] ;todo: is this deliberate or accidental? see gsub-processor
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[cursiveAttachment #f]
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[markattachment #f]
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[shaperInfo #f]
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[substituted #f]
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[isMark #f]
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[isLigature #f])
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(define/public (id [id-in #f])
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(cond
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[(not id-in) _id]
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[else (set-field! _id this id-in)
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(set-field! substituted this #t)
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(cond
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[(and (· this _font GDEF) (· this _font GDEF glyphClassDef))
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(define classID (send (+OTProcessor) getClassID id-in (· this _font GDEF glyphClassDef)))
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(set-field! isMark this (= classID 3))
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(set-field! isLigature this (= classID 2))]
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[else
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(set-field! isMark this (andmap is-mark? (· this codePoints)))
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(set-field! isLigature this (> (length (· this codePoints)) 1))])])))
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