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node_modules/fontkit/src/tables/GSUB.js

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