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import r from 'restructure';
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import { UnboundedArray, LookupTable, StateTable } from './aat';
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let LigatureData = {
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action: r.uint16
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};
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let ContextualData = {
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markIndex: r.uint16,
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currentIndex: r.uint16
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};
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let InsertionData = {
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currentInsertIndex: r.uint16,
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markedInsertIndex: r.uint16
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};
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let SubstitutionTable = new r.Struct({
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items: new UnboundedArray(new r.Pointer(r.uint32, new LookupTable))
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});
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let SubtableData = new r.VersionedStruct('type', {
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0: { // Indic Rearrangement Subtable
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stateTable: new StateTable
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},
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1: { // Contextual Glyph Substitution Subtable
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stateTable: new StateTable(ContextualData),
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substitutionTable: new r.Pointer(r.uint32, SubstitutionTable)
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},
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2: { // Ligature subtable
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stateTable: new StateTable(LigatureData),
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ligatureActions: new r.Pointer(r.uint32, new UnboundedArray(r.uint32)),
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components: new r.Pointer(r.uint32, new UnboundedArray(r.uint16)),
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ligatureList: new r.Pointer(r.uint32, new UnboundedArray(r.uint16))
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},
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4: { // Non-contextual Glyph Substitution Subtable
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lookupTable: new LookupTable
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},
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5: { // Glyph Insertion Subtable
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stateTable: new StateTable(InsertionData),
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insertionActions: new r.Pointer(r.uint32, new UnboundedArray(r.uint16))
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}
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});
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let Subtable = new r.Struct({
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length: r.uint32,
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coverage: r.uint24,
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type: r.uint8,
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subFeatureFlags: r.uint32,
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table: SubtableData,
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padding: new r.Reserved(r.uint8, t => t.length - t._currentOffset)
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});
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let FeatureEntry = new r.Struct({
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featureType: r.uint16,
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featureSetting: r.uint16,
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enableFlags: r.uint32,
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disableFlags: r.uint32
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});
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let MorxChain = new r.Struct({
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defaultFlags: r.uint32,
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chainLength: r.uint32,
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nFeatureEntries: r.uint32,
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nSubtables: r.uint32,
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features: new r.Array(FeatureEntry, 'nFeatureEntries'),
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subtables: new r.Array(Subtable, 'nSubtables')
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});
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export default new r.Struct({
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version: r.uint16,
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unused: new r.Reserved(r.uint16),
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nChains: r.uint32,
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chains: new r.Array(MorxChain, 'nChains')
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});
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