Remove redundant name table records

Snippets/clean-nametable.py

@@ -0,0 +1,94 @@
+#!/usr/bin/env python3
+"""Script to remove redundant font name table records."""
+from fontTools.ttLib.ttVisitor import TTVisitor
+from fontTools import ttLib
+from fontTools.ttLib import TTFont
+import fontTools.ttLib.tables.otTables as otTables
+from fontTools.ttLib.tables import C_P_A_L_
+import sys
+import logging
+
+
+logger = logging.getLogger()
+
+
+class NameRecordVisitor(TTVisitor):
+    def __init__(self):
+        self.seen = set()
+
+    def removeUnusedNameRecords(self, font):
+        self.visit(font)
+        toDelete = set()
+        for record in font["name"].names:
+            # Name IDs 26 to 255, inclusive, are reserved for future standard names.
+            # https://learn.microsoft.com/en-us/typography/opentype/spec/name#name-ids
+            if record.nameID < 256:
+                continue
+            if record.nameID not in self.seen:
+                toDelete.add(record.nameID)
+
+        if not toDelete:
+            logger.info("Name table has no redundant records, skipping")
+            return
+        logger.info(f"Deleting name records with NameIDs {toDelete}")
+        for nameID in toDelete:
+            font["name"].removeNames(nameID)
+
+
+@NameRecordVisitor.register_attrs(
+    (
+        (otTables.FeatureParamsSize, ("SubfamilyID", "SubfamilyNameID")),
+        (otTables.FeatureParamsStylisticSet, ("UINameID",)),
+        (
+            otTables.FeatureParamsCharacterVariants,
+            (
+                "FeatUILabelNameID",
+                "FeatUITooltipTextNameID",
+                "SampleTextNameID",
+                "FirstParamUILabelNameID",
+            ),
+        ),
+        (otTables.STAT, ("ElidedFallbackNameID",)),
+        (otTables.AxisRecord, ("AxisNameID",)),
+        (otTables.AxisValue, ("ValueNameID",)),
+        (otTables.FeatureName, ("FeatureNameID",)),
+        (otTables.Setting, ("SettingNameID",)),
+    )
+)
+def visit(visitor, obj, attr, value):
+    visitor.seen.add(value)
+
+
+@NameRecordVisitor.register(ttLib.getTableClass("fvar"))
+def visit(visitor, obj):
+    for inst in obj.instances:
+        visitor.seen.add(inst.postscriptNameID)
+        visitor.seen.add(inst.subfamilyNameID)
+
+    for axis in obj.axes:
+        visitor.seen.add(axis.axisNameID)
+
+
+@NameRecordVisitor.register(ttLib.getTableClass("CPAL"))
+def visit(visitor, obj):
+    for nameID in obj.paletteLabels:
+        if nameID != C_P_A_L_.table_C_P_A_L_.NO_NAME_ID:
+            visitor.seen.add(nameID)
+
+
+def removeUnusedNameRecords(ttFont):
+    visitor = NameRecordVisitor()
+    visitor.removeUnusedNameRecords(ttFont)
+
+
+def main():
+    if len(sys.argv) != 3:
+        print("Usage: python nameClean.py font.ttf out.ttf")
+        sys.exit()
+    font = TTFont(sys.argv[1])
+    removeUnusedNameRecords(font)
+    font.save(sys.argv[2])
+
+
+if __name__ == "__main__":
+    main()