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#lang fontkit/racket
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(require restructure)
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(provide (all-defined-out))
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;;########################
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;; Scripts and Languages #
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;;########################
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(define LangSysTable (+Struct
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(dictify 'reserved uint16be
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'reqFeatureIndex uint16be
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'featureCount uint16be
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'featureIndexes (+Array uint16be 'featureCount))))
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(define LangSysRecord (+Struct
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(dictify 'tag (+String 4)
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'langSys (+Pointer uint16be LangSysTable 'parent))))
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(define Script (+Struct
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(dictify 'defaultLangSys (+Pointer uint16be LangSysTable)
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'count uint16be
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'langSysRecords (+Array LangSysRecord 'count))))
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(define-subclass Struct (ScriptRecord-Struct))
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(define ScriptRecord (+ScriptRecord-Struct
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(dictify 'tag (+String 4)
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'script (+Pointer uint16be Script 'parent))))
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(define ScriptList (+Array ScriptRecord uint16be))
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;;#######################
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;; Features and Lookups #
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;;#######################
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(define Feature (+Struct (dictify
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'featureParams uint16be ; pointer
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'lookupCount uint16be
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'lookupListIndexes (+Array uint16be 'lookupCount))))
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(define FeatureRecord (+Struct (dictify
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'tag (+String 4)
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'feature (+Pointer uint16be Feature 'parent))))
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(define FeatureList (+Array FeatureRecord uint16be))
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(define LookupFlags (+Bitfield uint16be '(rightToLeft ignoreBaseGlyphs ignoreLigatures ignoreMarks useMarkFilteringSet #f markAttachmentType)))
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(define (LookupList SubTable)
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(define Lookup (+Struct
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(dictify
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'lookupType uint16be
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'flags LookupFlags
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'subTableCount uint16be
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'subTables (+Array (+Pointer uint16be SubTable) 'subTableCount)
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'markFilteringSet uint16be))) ; TODO: only present when flags says so ...
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(+LazyArray (+Pointer uint16be Lookup) uint16be))
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;;#############################################
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;; Contextual Substitution/Positioning Tables #
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;;#############################################
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(define LookupRecord (+Struct
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(dictify
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'sequenceIndex uint16be
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'lookupListIndex uint16be)))
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(define Context
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(+VersionedStruct
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uint16be
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(dictify
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;; Simple context
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1 (dictify
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'coverage uint16be ; pointer
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'ruleSetCount uint16be
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'ruleSets (+Array uint16be 'ruleSetCount)) ; pointer
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;; Class-based context
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2 (dictify
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'coverage uint16be ; pointer
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'classDef uint16be ; pointer
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'classSetCnt uint16be
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'classSet (+Array uint16be 'classSetCnt)) ; pointer
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3 (dictify
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'glyphCount uint16be
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'lookupCount uint16be
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'coverages (+Array uint16be 'glyphCount) ; pointer
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'lookupRecords (+Array LookupRecord 'lookupCount)))))
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;;######################################################
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;; Chaining Contextual Substitution/Positioning Tables #
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;;######################################################
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(define ChainingContext
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(+VersionedStruct
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uint16be
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(dictify
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;; Simple context glyph substitution
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1 (dictify
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'coverage uint16be ; pointer
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'chainCount uint16be
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'chainRuelSets (+Array uint16be 'chainCount)) ; pointer
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;; Class-based chaining context
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2 (dictify
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'coverage uint16be ; pointer
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'backtrackClassDef uint16be ; pointer
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'inputClassDef uint16be ; pointer
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'lookaheadClassDef uint16be ; pointer
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'chainCount uint16be
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'chainClassSet (+Array uint16be 'chainCount)) ; pointer
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;; Coverage-based chaining context
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3 (dictify
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'backtrackGlyphCount uint16be
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'backtrackCoverage (+Array uint16be 'backtrackGlyphCount) ; pointer
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'inputGlyphCount uint16be
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'inputCoverage (+Array uint16be 'inputGlyphCount) ; pointer
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'lookaheadGlyphCount uint16be
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'lookaheadCoverage (+Array uint16be 'lookaheadGlyphCount) ; pointer
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'lookupCount uint16be
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'lookupRecords (+Array LookupRecord 'lookupCount)))))
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