fontbox/src/main/java/org/apache/fontbox/ttf/gsub/GsubWorkerForDevanagari.java [207:262]:
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    private List<Integer> applyGsubFeature(ScriptFeature scriptFeature, List<Integer> originalGlyphs)
    {
        Set<List<Integer>> allGlyphIdsForSubstitution = scriptFeature.getAllGlyphIdsForSubstitution();
        if (allGlyphIdsForSubstitution.isEmpty())
        {
            LOG.debug("getAllGlyphIdsForSubstitution() for {} is empty", scriptFeature.getName());
            return originalGlyphs;
        }
        GlyphArraySplitter glyphArraySplitter = new GlyphArraySplitterRegexImpl(
                allGlyphIdsForSubstitution);
        List<List<Integer>> tokens = glyphArraySplitter.split(originalGlyphs);
        List<Integer> gsubProcessedGlyphs = new ArrayList<>(tokens.size());
        tokens.forEach(chunk ->
        {
            if (scriptFeature.canReplaceGlyphs(chunk))
            {
                List<Integer> replacementForGlyphs = scriptFeature.getReplacementForGlyphs(chunk);
                gsubProcessedGlyphs.addAll(replacementForGlyphs);
            }
            else
            {
                gsubProcessedGlyphs.addAll(chunk);
            }
        });
        LOG.debug("originalGlyphs: {}, gsubProcessedGlyphs: {}", originalGlyphs, gsubProcessedGlyphs);
        return gsubProcessedGlyphs;
    }

    private List<Integer> getBeforeHalfGlyphIds()
    {
        return List.of(getGlyphId(BEFORE_HALF_CHAR));
    }

    private List<Integer> getRephGlyphIds()
    {
        List<Integer> result = new ArrayList<>();
        for (char character : REPH_CHARS)
        {
            result.add(getGlyphId(character));
        }
        return Collections.unmodifiableList(result);
    }

    private List<Integer> getbeforeRephGlyphIds()
    {
        List<Integer> glyphIds = new ArrayList<>();
        for (char character : BEFORE_REPH_CHARS)
        {
            glyphIds.add(getGlyphId(character));
        }
        return Collections.unmodifiableList(glyphIds);
    }

    private Integer getGlyphId(char character)
    {
        return cmapLookup.getGlyphId(character);
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fontbox/src/main/java/org/apache/fontbox/ttf/gsub/GsubWorkerForGujarati.java [206:261]:
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    private List<Integer> applyGsubFeature(ScriptFeature scriptFeature, List<Integer> originalGlyphs)
    {
        Set<List<Integer>> allGlyphIdsForSubstitution = scriptFeature.getAllGlyphIdsForSubstitution();
        if (allGlyphIdsForSubstitution.isEmpty())
        {
            LOG.debug("getAllGlyphIdsForSubstitution() for {} is empty", scriptFeature.getName());
            return originalGlyphs;
        }
        GlyphArraySplitter glyphArraySplitter = new GlyphArraySplitterRegexImpl(
                allGlyphIdsForSubstitution);
        List<List<Integer>> tokens = glyphArraySplitter.split(originalGlyphs);
        List<Integer> gsubProcessedGlyphs = new ArrayList<>(tokens.size());
        tokens.forEach(chunk ->
        {
            if (scriptFeature.canReplaceGlyphs(chunk))
            {
                List<Integer> replacementForGlyphs = scriptFeature.getReplacementForGlyphs(chunk);
                gsubProcessedGlyphs.addAll(replacementForGlyphs);
            }
            else
            {
                gsubProcessedGlyphs.addAll(chunk);
            }
        });
        LOG.debug("originalGlyphs: {}, gsubProcessedGlyphs: {}", originalGlyphs, gsubProcessedGlyphs);
        return gsubProcessedGlyphs;
    }

    private List<Integer> getBeforeHalfGlyphIds()
    {
        return List.of(getGlyphId(BEFORE_HALF_CHAR));
    }

    private List<Integer> getRephGlyphIds()
    {
        List<Integer> result = new ArrayList<>();
        for (char character : REPH_CHARS)
        {
            result.add(getGlyphId(character));
        }
        return Collections.unmodifiableList(result);
    }

    private List<Integer> getbeforeRephGlyphIds()
    {
        List<Integer> glyphIds = new ArrayList<>();
        for (char character : BEFORE_REPH_CHARS)
        {
            glyphIds.add(getGlyphId(character));
        }
        return Collections.unmodifiableList(glyphIds);
    }

    private Integer getGlyphId(char character)
    {
        return cmapLookup.getGlyphId(character);
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