Merge "Update fontchain_linter for non-compat font"

        return tuple(f"{s:X}" for s in sequence)

    return hex(sequence)

def check_plausible_compat_pua(coverage, all_emoji, equivalent_emoji):

    # A PUA should point to every RGI emoji and that PUA should be unique to the

    # set of equivalent sequences for the emoji.

    problems = []

    for seq in all_emoji:

        # We're looking to match not-PUA with PUA so filter out existing PUA

        if contains_pua(seq):

            continue

        # Filter out non-RGI things that end up in all_emoji

        if only_tags(seq) or seq in {ZWJ, COMBINING_KEYCAP, EMPTY_FLAG_SEQUENCE}:

            continue

        equivalents = [seq]

        if seq in equivalent_emoji:

            equivalents.append(equivalent_emoji[seq])

        # If there are problems the hex code is much more useful

        log_equivalents = [hex_strs(s) for s in equivalents]

        # The system compat font should NOT include regional indicators as these have been split out

        if contains_regional_indicator(seq):

            assert not any(s in coverage for s in equivalents), f"Regional indicators not expected in compat font, found {log_equivalents}"

            continue

        glyph = {coverage[e] for e in equivalents}

        if len(glyph) != 1:

            problems.append(f"{log_equivalents} should all point to the same glyph")

            continue

        glyph = next(iter(glyph))

        pua = {s for s, g in coverage.items() if contains_pua(s) and g == glyph}

        if not pua:

            problems.append(f"Expected PUA for {log_equivalents} but none exist")

            continue

    assert not problems, "\n".join(sorted(problems)) + f"\n{len(problems)} PUA problems"

def check_emoji_compat(all_emoji, equivalent_emoji):

def check_emoji_not_compat(all_emoji, equivalent_emoji):

    compat_psnames = set()

    for emoji_font in get_emoji_fonts():

        ttf = open_font(emoji_font)

        psname = get_psname(ttf)

        is_compat_font = "meta" in ttf and 'Emji' in ttf["meta"].data

        if not is_compat_font:

            continue

        compat_psnames.add(psname)

        # If the font has compat metadata it should have PUAs for emoji sequences

        coverage = get_emoji_map(emoji_font)

        check_plausible_compat_pua(coverage, all_emoji, equivalent_emoji)

    # NotoColorEmoji must be a Compat font.

    assert 'NotoColorEmoji' in compat_psnames, 'NotoColorEmoji MUST be a compat font'

        if "meta" in ttf:

            assert 'Emji' not in ttf["meta"].data, 'NotoColorEmoji MUST be a compat font'

def check_emoji_font_coverage(emoji_fonts, all_emoji, equivalent_emoji):

        ucd_path = sys.argv[3]

        parse_ucd(ucd_path)

        all_emoji, default_emoji, equivalent_emoji = compute_expected_emoji()

        check_emoji_compat(all_emoji, equivalent_emoji)

        check_emoji_not_compat(all_emoji, equivalent_emoji)

        check_emoji_coverage(all_emoji, equivalent_emoji)

        check_emoji_defaults(default_emoji)