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import r from 'restructure';
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import {ScriptList, FeatureList, LookupList, Coverage, ClassDef, Device, Context, ChainingContext} from './opentype';
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import {FeatureVariations} from './variations';
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let Sequence = new r.Array(r.uint16, r.uint16);
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let AlternateSet = Sequence;
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let Ligature = new r.Struct({
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glyph: r.uint16,
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compCount: r.uint16,
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components: new r.Array(r.uint16, t => t.compCount - 1)
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});
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let LigatureSet = new r.Array(new r.Pointer(r.uint16, Ligature), r.uint16);
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let GSUBLookup = new r.VersionedStruct('lookupType', {
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1: new r.VersionedStruct(r.uint16, {// Single Substitution
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1: {
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coverage: new r.Pointer(r.uint16, Coverage),
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deltaGlyphID: r.int16
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},
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2: {
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coverage: new r.Pointer(r.uint16, Coverage),
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glyphCount: r.uint16,
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substitute: new r.LazyArray(r.uint16, 'glyphCount')
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}
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}),
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2: { // Multiple Substitution
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substFormat: r.uint16,
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coverage: new r.Pointer(r.uint16, Coverage),
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count: r.uint16,
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sequences: new r.LazyArray(new r.Pointer(r.uint16, Sequence), 'count')
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},
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3: { // Alternate Substitution
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substFormat: r.uint16,
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coverage: new r.Pointer(r.uint16, Coverage),
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count: r.uint16,
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alternateSet: new r.LazyArray(new r.Pointer(r.uint16, AlternateSet), 'count')
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},
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4: { // Ligature Substitution
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substFormat: r.uint16,
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coverage: new r.Pointer(r.uint16, Coverage),
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count: r.uint16,
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ligatureSets: new r.LazyArray(new r.Pointer(r.uint16, LigatureSet), 'count')
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},
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5: Context, // Contextual Substitution
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6: ChainingContext, // Chaining Contextual Substitution
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7: { // Extension Substitution
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substFormat: r.uint16,
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lookupType: r.uint16, // cannot also be 7
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extension: new r.Pointer(r.uint32, GSUBLookup)
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},
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8: { // Reverse Chaining Contextual Single Substitution
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substFormat: r.uint16,
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coverage: new r.Pointer(r.uint16, Coverage),
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backtrackCoverage: new r.Array(new r.Pointer(r.uint16, Coverage), 'backtrackGlyphCount'),
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lookaheadGlyphCount: r.uint16,
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lookaheadCoverage: new r.Array(new r.Pointer(r.uint16, Coverage), 'lookaheadGlyphCount'),
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glyphCount: r.uint16,
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substitutes: new r.Array(r.uint16, 'glyphCount')
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}
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});
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// Fix circular reference
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GSUBLookup.versions[7].extension.type = GSUBLookup;
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export default new r.VersionedStruct(r.uint32, {
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header: {
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scriptList: new r.Pointer(r.uint16, ScriptList),
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featureList: new r.Pointer(r.uint16, FeatureList),
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lookupList: new r.Pointer(r.uint16, new LookupList(GSUBLookup))
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},
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0x00010000: {},
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0x00010001: {
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featureVariations: new r.Pointer(r.uint32, FeatureVariations)
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}
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});
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