#!perl -w
use 5.015;
use strict;
use warnings;
use Unicode::UCD qw(prop_aliases
                    prop_values
                    prop_value_aliases
                    prop_invlist
                    prop_invmap search_invlist
                    charprop
                   );
require './regen/regen_lib.pl';
require './regen/charset_translations.pl';

# This program outputs charclass_invlists.h, which contains various inversion
# lists in the form of C arrays that are to be used as-is for inversion lists.
# Thus, the lists it contains are essentially pre-compiled, and need only a
# light-weight fast wrapper to make them usable at run-time.

# As such, this code knows about the internal structure of these lists, and
# any change made to that has to be done here as well.  A random number stored
# in the headers is used to minimize the possibility of things getting
# out-of-sync, or the wrong data structure being passed.  Currently that
# random number is:

# charclass_invlists.h now also has a partial implementation of inversion
# maps; enough to generate tables for the line break properties, such as GCB

my $VERSION_DATA_STRUCTURE_TYPE = 148565664;

# integer or float
my $numeric_re = qr/ ^ -? \d+ (:? \. \d+ )? $ /ax;

# Matches valid C language enum names: begins with ASCII alphabetic, then any
# ASCII \w
my $enum_name_re = qr / ^ [[:alpha:]] \w* $ /ax;

my $out_fh = open_new('charclass_invlists.h', '>',
		      {style => '*', by => 'regen/mk_invlists.pl',
                      from => "Unicode::UCD"});

my $in_file_pound_if = 0;

my $max_hdr_len = 3;    # In headings, how wide a name is allowed?

print $out_fh "/* See the generating file for comments */\n\n";

# enums that should be made public
my %public_enums = (
                    #_Perl_SCX => 1
                    );

# The symbols generated by this program are all currently defined only in a
# single dot c each.  The code knows where most of them go, but this hash
# gives overrides for the exceptions to the typical place
my %exceptions_to_where_to_define =
                        (
                        );
my %where_to_define_enums = ();

my %gcb_enums;
my @gcb_short_enums;
my %gcb_abbreviations;
my %lb_enums;
my @lb_short_enums;
my %lb_abbreviations;
my %wb_enums;
my @wb_short_enums;
my %wb_abbreviations;

my @a2n;

sub uniques {
    # Returns non-duplicated input values.  From "Perl Best Practices:
    # Encapsulated Cleverness".  p. 455 in first edition.

    my %seen;
    return grep { ! $seen{$_}++ } @_;
}

sub a2n($) {
    my $cp = shift;

    # Returns the input Unicode code point translated to native.

    return $cp if $cp !~ $numeric_re || $cp > 255;
    return $a2n[$cp];
}

sub end_file_pound_if {
    if ($in_file_pound_if) {
        print $out_fh "\n#endif\t/* $in_file_pound_if */\n";
        $in_file_pound_if = 0;
    }
}

sub switch_pound_if ($$) {
    my $name = shift;
    my $new_pound_if = shift;
    my @new_pound_if = ref ($new_pound_if)
                       ? @$new_pound_if
                       : $new_pound_if;

    # Switch to new #if given by the 2nd argument.  If there is an override
    # for this, it instead switches to that.  The 1st argument is the
    # static's name, used to look up the overrides

    if (exists $exceptions_to_where_to_define{$name}) {
        @new_pound_if = $exceptions_to_where_to_define{$name};
    }
    $new_pound_if = join "", @new_pound_if;

    # Exit current #if if the new one is different from the old
    if (   $in_file_pound_if
        && $in_file_pound_if !~ /$new_pound_if/)
    {
        end_file_pound_if;
    }

    # Enter new #if, if not already in it.
    if (! $in_file_pound_if) {
        foreach my $element (@new_pound_if) {
            $element = "defined($element)";
        }
        $in_file_pound_if = join " || ", @new_pound_if;
        print $out_fh "\n#if $in_file_pound_if\n";
    }
}

sub output_invlist ($$;$) {
    my $name = shift;
    my $invlist = shift;     # Reference to inversion list array
    my $charset = shift // "";  # name of character set for comment

    die "No inversion list for $name" unless defined $invlist
                                             && ref $invlist eq 'ARRAY';

    # Output the inversion list $invlist using the name $name for it.
    # It is output in the exact internal form for inversion lists.

    # Is the last element of the header 0, or 1 ?
    my $zero_or_one = 0;
    if (@$invlist && $invlist->[0] != 0) {
        unshift @$invlist, 0;
        $zero_or_one = 1;
    }
    my $count = @$invlist;

    switch_pound_if ($name, 'PERL_IN_PERL_C');

    print $out_fh "\nstatic const UV ${name}_invlist[] = {";
    print $out_fh " /* for $charset */" if $charset;
    print $out_fh "\n";

    print $out_fh "\t$count,\t/* Number of elements */\n";
    print $out_fh "\t$VERSION_DATA_STRUCTURE_TYPE, /* Version and data structure type */\n";
    print $out_fh "\t", $zero_or_one,
                  ",\t/* 0 if the list starts at 0;",
                  "\n\t\t   1 if it starts at the element beyond 0 */\n";

    # The main body are the UVs passed in to this routine.  Do the final
    # element separately
    for my $i (0 .. @$invlist - 1) {
        printf $out_fh "\t0x%X", $invlist->[$i];
        print $out_fh "," if $i < @$invlist - 1;
        print $out_fh "\n";
    }

    print $out_fh "};\n";
}

sub output_invmap ($$$$$$$) {
    my $name = shift;
    my $invmap = shift;     # Reference to inversion map array
    my $prop_name = shift;
    my $input_format = shift;   # The inversion map's format
    my $default = shift;        # The property value for code points who
                                # otherwise don't have a value specified.
    my $extra_enums = shift;    # comma-separated list of our additions to the
                                # property's standard possible values
    my $charset = shift // "";  # name of character set for comment

    # Output the inversion map $invmap for property $prop_name, but use $name
    # as the actual data structure's name.

    my $count = @$invmap;

    my $output_format;
    my $invmap_declaration_type;
    my $enum_declaration_type;
    my $aux_declaration_type;
    my %enums;
    my $name_prefix;

    if ($input_format =~ / ^ [as] l? $ /x) {
        $prop_name = (prop_aliases($prop_name))[1] // $prop_name =~ s/^_Perl_//r; # Get full name
        my $short_name = (prop_aliases($prop_name))[0] // $prop_name;
        my @input_enums;

        # Find all the possible input values.  These become the enum names
        # that comprise the inversion map.  For inputs that don't have sub
        # lists, we can just get the unique values.  Otherwise, we have to
        # expand the sublists first.
        if ($input_format !~ / ^ a /x) {
            if ($input_format ne 'sl') {
                @input_enums = sort(uniques(@$invmap));
            }
            else {
                foreach my $element (@$invmap) {
                    if (ref $element) {
                        push @input_enums, @$element;
                    }
                    else {
                        push @input_enums, $element;
                    }
                }
                @input_enums = sort(uniques(@input_enums));
            }
        }

        # The internal enums come last, and in the order specified.
        my @enums = @input_enums;
        my @extras;
        if ($extra_enums ne "") {
            @extras = split /,/, $extra_enums;

            # Don't add if already there.
            foreach my $this_extra (@extras) {
                next if grep { $_ eq $this_extra } @enums;

                push @enums, $this_extra;
            }
        }

        # Assign a value to each element of the enum type we are creating.
        # The default value always gets 0; the others are arbitrarily
        # assigned.
        my $enum_val = 0;
        my $canonical_default = prop_value_aliases($prop_name, $default);
        $default = $canonical_default if defined $canonical_default;
        $enums{$default} = $enum_val++;

        for my $enum (@enums) {
            $enums{$enum} = $enum_val++ unless exists $enums{$enum};
        }

        # Calculate the data for the special tables output for these properties.
        if ($name =~ / ^  _Perl_ (?: GCB | LB | WB ) $ /x) {

            # The data includes the hashes %gcb_enums, %lb_enums, etc.
            # Similarly we calculate column headings for the tables.
            #
            # We use string evals to allow the same code to work on
            # all the tables
            my $type = lc $prop_name;

            my $placeholder = "a";

            # Skip if we've already done this code, which populated
            # this hash
            if (eval "! \%${type}_enums") {

                # For each enum in the type ...
                foreach my $enum (sort keys %enums) {
                    my $value = $enums{$enum};
                    my $short;
                    my $abbreviated_from;

                    # Special case this wb property value to make the
                    # name more clear
                    if ($enum eq 'Perl_Tailored_HSpace') {
                        $short = 'hs';
                        $abbreviated_from = $enum;
                    }
                    else {

                        # Use the official short name, if found.
                        ($short) = prop_value_aliases($type, $enum);

                        if (! defined $short) {

                            # But if there is no official name, use the name
                            # that came from the data (if any).  Otherwise,
                            # the name had to come from the extras list.
                            # There are two types of values in that list.
                            #
                            # First are those enums that are not part of the
                            # property, but are defined by this code.  By
                            # convention these have all-caps names of at least
                            # 4 characters.  We use the lowercased name for
                            # thse.
                            #
                            # Second are enums that are needed to get
                            # regexec.c to compile, but don't exist in all
                            # Unicode releases.  To get here, we must be
                            # compiling an earlier Unicode release that
                            # doesn't have that enum, so just use a unique
                            # anonymous name for it.
                            if (grep { $_ eq $enum } @input_enums) {
                                $short = $enum
                            }
                            elsif ($enum !~ / ^ [A-Z]{4,} $ /x) {
                                $short = $placeholder++;
                            }
                            else {
                                $short = lc $enum;
                            }
                        }
                    }

                    # If our short name is too long, or we already
                    # know that the name is an abbreviation, truncate
                    # to make sure it's short enough, and remember
                    # that we did this so we can later add a comment in the
                    # generated file
                    if (   $abbreviated_from
                        || length $short > $max_hdr_len)
                        {
                        $short = substr($short, 0, $max_hdr_len);
                        $abbreviated_from = $enum
                                            unless $abbreviated_from;
                        # If the name we are to display conflicts, try
                        # another.
                        while (eval "exists
                                        \$${type}_abbreviations{$short}")
                        {
                            die $@ if $@;

                            # The increment operator on strings doesn't work
                            # on those containing an '_', so just use the
                            # final portion.
                            my @short = split '_', $short;
                            $short[-1]++;
                            $short = join "_", @short;
                        }

                        eval "\$${type}_abbreviations{$short} = '$enum'";
                        die $@ if $@;
                    }

                    # Remember the mapping from the property value
                    # (enum) name to its value.
                    eval "\$${type}_enums{$enum} = $value";
                    die $@ if $@;

                    # Remember the inverse mapping to the short name
                    # so that we can properly label the generated
                    # table's rows and columns
                    eval "\$${type}_short_enums[$value] = '$short'";
                    die $@ if $@;
                }
            }
        }

        # Inversion map stuff is used only by regexec or utf-8 (if it is
        # for code points) , unless it is in the enum exception list
        my $where = (exists $where_to_define_enums{$name})
                    ? $where_to_define_enums{$name}
                    : ($input_format =~ /a/)
                       ? 'PERL_IN_UTF8_C'
                       : 'PERL_IN_REGEXEC_C';

        my $is_public_enum = exists $public_enums{$name};
        if ($is_public_enum) {
            end_file_pound_if;
        }
        else {
            switch_pound_if($name, $where);
        }

        # The short names tend to be two lower case letters, but it looks
        # better for those if they are upper. XXX
        $short_name = uc($short_name) if length($short_name) < 3
                                      || substr($short_name, 0, 1) =~ /[[:lower:]]/;
        $name_prefix = "${short_name}_";

        # Start the enum definition for this map
        my @enum_definition;
        my @enum_list;
        foreach my $enum (keys %enums) {
            $enum_list[$enums{$enum}] = $enum;
        }
        foreach my $i (0 .. @enum_list - 1) {
            push @enum_definition, ",\n" if $i > 0;

            my $name = $enum_list[$i];
            push @enum_definition, "\t${name_prefix}$name = $i";
        }

        # For an 'l' property, we need extra enums, because some of the
        # elements are lists.  Each such distinct list is placed in its own
        # auxiliary map table.  Here, we go through the inversion map, and for
        # each distinct list found, create an enum value for it, numbered -1,
        # -2, ....
        my %multiples;
        my $aux_table_prefix = "AUX_TABLE_";
        if ($input_format =~ /l/) {
            foreach my $element (@$invmap) {

                # A regular scalar is not one of the lists we're looking for
                # at this stage.
                next unless ref $element;

                my $joined;
                if ($input_format =~ /a/) { # These are already ordered
                    $joined = join ",", @$element;
                }
                else {
                    $joined = join ",", sort @$element;
                }
                my $already_found = exists $multiples{$joined};

                my $i;
                if ($already_found) {   # Use any existing one
                    $i = $multiples{$joined};
                }
                else {  # Otherwise increment to get a new table number
                    $i = keys(%multiples) + 1;
                    $multiples{$joined} = $i;
                }

                # This changes the inversion map for this entry to not be the
                # list
                $element = "use_$aux_table_prefix$i";

                # And add to the enum values
                if (! $already_found) {
                    push @enum_definition, ",\n\t${name_prefix}$element = -$i";
                }
            }
        }

        $enum_declaration_type = "${name_prefix}enum";

        # Finished with the enum definition.  If it only contains one element,
        # that is a dummy, default one
        if (scalar @enum_definition > 1) {

            # Currently unneeded
            #print $out_fh "\n#define ${name_prefix}ENUM_COUNT ",
            #                                   ..scalar keys %enums, "\n";

            if ($input_format =~ /l/) {
                print $out_fh
                "\n",
                "/* Negative enum values indicate the need to use an",
                    " auxiliary table\n",
                " * consisting of the list of enums this one expands to.",
                    "  The absolute\n",
                " * values of the negative enums are indices into a table",
                    " of the auxiliary\n",
                " * tables' addresses */";
            }
            print $out_fh "\ntypedef enum {\n";
            print $out_fh join "", @enum_definition;
            print $out_fh "\n";
            print $out_fh "} $enum_declaration_type;\n";
        }

        switch_pound_if($name, $where) if $is_public_enum;

        $invmap_declaration_type = ($input_format =~ /s/)
                                 ? $enum_declaration_type
                                 : "int";
        $aux_declaration_type = ($input_format =~ /s/)
                                 ? $enum_declaration_type
                                 : "unsigned int";

        $output_format = "${name_prefix}%s";

        # If there are auxiliary tables, output them.
        if (%multiples) {

            print $out_fh "\n#define HAS_${name_prefix}AUX_TABLES\n";

            # Invert keys and values
            my %inverted_mults;
            while (my ($key, $value) = each %multiples) {
                $inverted_mults{$value} = $key;
            }

            # Output them in sorted order
            my @sorted_table_list = sort { $a <=> $b } keys %inverted_mults;

            # Keep track of how big each aux table is
            my @aux_counts;

            # Output each aux table.
            foreach my $table_number (@sorted_table_list) {
                my $table = $inverted_mults{$table_number};
                print $out_fh "\nstatic const $aux_declaration_type $name_prefix$aux_table_prefix$table_number\[] = {\n";

                # Earlier, we joined the elements of this table together with a comma
                my @elements = split ",", $table;

                $aux_counts[$table_number] = scalar @elements;
                for my $i (0 .. @elements - 1) {
                    print $out_fh  ",\n" if $i > 0;
                    if ($input_format =~ /a/) {
                        printf $out_fh "\t0x%X", $elements[$i];
                    }
                    else {
                        print $out_fh "\t${name_prefix}$elements[$i]";
                    }
                }
                print $out_fh "\n};\n";
            }

            # Output the table that is indexed by the absolute value of the
            # aux table enum and contains pointers to the tables output just
            # above
            print $out_fh "\nstatic const $aux_declaration_type * const ${name_prefix}${aux_table_prefix}ptrs\[] = {\n";
            print $out_fh "\tNULL,\t/* Placeholder */\n";
            for my $i (1 .. @sorted_table_list) {
                print $out_fh  ",\n" if $i > 1;
                print $out_fh  "\t$name_prefix$aux_table_prefix$i";
            }
            print $out_fh "\n};\n";

            print $out_fh
              "\n/* Parallel table to the above, giving the number of elements"
            . " in each table\n * pointed to */\n";
            print $out_fh "static const U8 ${name_prefix}${aux_table_prefix}lengths\[] = {\n";
            print $out_fh "\t0,\t/* Placeholder */\n";
            for my $i (1 .. @sorted_table_list) {
                print $out_fh  ",\n" if $i > 1;
                print $out_fh  "\t$aux_counts[$i]\t/* $name_prefix$aux_table_prefix$i */";
            }
            print $out_fh "\n};\n";
        } # End of outputting the auxiliary and associated tables

        # The scx property used in regexec.c needs a specialized table which
        # is most convenient to output here, while the data structures set up
        # above are still extant.  This table contains the code point that is
        # the zero digit of each script, indexed by script enum value.
        if (lc $short_name eq 'scx') {
            my @decimals_invlist = prop_invlist("Numeric_Type=Decimal");
            my %script_zeros;

            # Find all the decimal digits.  The 0 of each range is always the
            # 0th element, except in some early Unicode releases, so check for
            # that.
            for (my $i = 0; $i < @decimals_invlist; $i += 2) {
                my $code_point = $decimals_invlist[$i];
                next if chr($code_point) !~ /\p{Nv=0}/;

                # Turn the scripts this zero is in into a list.
                my @scripts = split ",",
                  charprop($code_point, "_Perl_SCX", '_perl_core_internal_ok');
                $code_point = sprintf("0x%x", $code_point);

                foreach my $script (@scripts) {
                    if (! exists $script_zeros{$script}) {
                        $script_zeros{$script} = $code_point;
                    }
                    elsif (ref $script_zeros{$script}) {
                        push $script_zeros{$script}->@*, $code_point;
                    }
                    else {  # Turn into a list if this is the 2nd zero of the
                            # script
                        my $existing = $script_zeros{$script};
                        undef $script_zeros{$script};
                        push $script_zeros{$script}->@*, $existing, $code_point;
                    }
                }
            }

            # @script_zeros contains the zero, sorted by the script's enum
            # value
            my @script_zeros;
            foreach my $script (keys %script_zeros) {
                my $enum_value = $enums{$script};
                $script_zeros[$enum_value] = $script_zeros{$script};
            }

            print $out_fh
            "\n/* This table, indexed by the script enum, gives the zero"
          . " code point for that\n * script; 0 if the script has multiple"
          . " digit sequences.  Scripts without a\n * digit sequence use"
          . " ASCII [0-9], hence are marked '0' */\n";
            print $out_fh "static const UV script_zeros[] = {\n";
            for my $i (0 .. @script_zeros - 1) {
                my $code_point = $script_zeros[$i];
                if (defined $code_point) {
                    $code_point = " 0" if ref $code_point;
                    print $out_fh "\t$code_point";
                }
                elsif (lc $enum_list[$i] eq 'inherited') {
                    print $out_fh "\t 0";
                }
                else {  # The only digits a script without its own set accepts
                        # is [0-9]
                    print $out_fh "\t'0'";
                }
                print $out_fh "," if $i < @script_zeros - 1;
                print $out_fh "\t/* $enum_list[$i] */";
                print $out_fh "\n";
            }
            print $out_fh "};\n";
        } # End of special handling of scx
    }
    else {
        die "'$input_format' invmap() format for '$prop_name' unimplemented";
    }

    die "No inversion map for $prop_name" unless defined $invmap
                                             && ref $invmap eq 'ARRAY'
                                             && $count;

    # Now output the inversion map proper
    print $out_fh "\nstatic const $invmap_declaration_type ${name}_invmap[] = {";
    print $out_fh " /* for $charset */" if $charset;
    print $out_fh "\n";

    # The main body are the scalars passed in to this routine.
    for my $i (0 .. $count - 1) {
        my $element = $invmap->[$i];
        my $full_element_name = prop_value_aliases($prop_name, $element);
        if ($input_format =~ /a/ && $element !~ /\D/) {
            $element = ($element == 0)
                       ? 0
                       : sprintf("0x%X", $element);
        }
        else {
        $element = $full_element_name if defined $full_element_name;
        $element = $name_prefix . $element;
        }
        print $out_fh "\t$element";
        print $out_fh "," if $i < $count - 1;
        print $out_fh  "\n";
    }
    print $out_fh "};\n";
}

sub mk_invlist_from_sorted_cp_list {

    # Returns an inversion list constructed from the sorted input array of
    # code points

    my $list_ref = shift;

    return unless @$list_ref;

    # Initialize to just the first element
    my @invlist = ( $list_ref->[0], $list_ref->[0] + 1);

    # For each succeeding element, if it extends the previous range, adjust
    # up, otherwise add it.
    for my $i (1 .. @$list_ref - 1) {
        if ($invlist[-1] == $list_ref->[$i]) {
            $invlist[-1]++;
        }
        else {
            push @invlist, $list_ref->[$i], $list_ref->[$i] + 1;
        }
    }
    return @invlist;
}

# Read in the Case Folding rules, and construct arrays of code points for the
# properties we need.
my ($cp_ref, $folds_ref, $format, $default) = prop_invmap("Case_Folding");
die "Could not find inversion map for Case_Folding" unless defined $format;
die "Incorrect format '$format' for Case_Folding inversion map"
                                                    unless $format eq 'al'
                                                           || $format eq 'a';
my @has_multi_char_fold;
my @is_non_final_fold;

for my $i (0 .. @$folds_ref - 1) {
    next unless ref $folds_ref->[$i];   # Skip single-char folds
    push @has_multi_char_fold, $cp_ref->[$i];

    # Add to the non-finals list each code point that is in a non-final
    # position
    for my $j (0 .. @{$folds_ref->[$i]} - 2) {
        push @is_non_final_fold, $folds_ref->[$i][$j]
                unless grep { $folds_ref->[$i][$j] == $_ } @is_non_final_fold;
    }
}

sub _Perl_Non_Final_Folds {
    @is_non_final_fold = sort { $a <=> $b } @is_non_final_fold;
    my @return = mk_invlist_from_sorted_cp_list(\@is_non_final_fold);
    return \@return;
}

sub _Perl_IVCF {

    # This creates a map of the inversion of case folding. i.e., given a
    # character, it gives all the other characters that fold to it.
    #
    # Inversion maps function kind of like a hash, with the inversion list
    # specifying the buckets (keys) and the inversion maps specifying the
    # contents of the corresponding bucket.  Effectively this function just
    # swaps the keys and values of the case fold hash.  But there are
    # complications.  Most importantly, More than one character can each have
    # the same fold.  This is solved by having a list of characters that fold
    # to a given one.

    my %new;

    # Go through the inversion list.
    for (my $i = 0; $i < @$cp_ref; $i++) {

        # Skip if nothing folds to this
        next if $folds_ref->[$i] == 0;

        # This entry which is valid from here to up (but not including) the
        # next entry is for the next $count characters, so that, for example,
        # A-Z is represented by one entry.
        my $cur_list = $cp_ref->[$i];
        my $count = $cp_ref->[$i+1] - $cur_list;

        # The fold of [$i] can be not just a single character, but a sequence
        # of multiple ones.  We deal with those here by just creating a string
        # consisting of them.  Otherwise, we use the single code point [$i]
        # folds to.
        my $cur_map = (ref $folds_ref->[$i])
                       ? join "", map { chr } $folds_ref->[$i]->@*
                       : $folds_ref->[$i];

        # Expand out this range
        while ($count > 0) {
            push @{$new{$cur_map}}, $cur_list;

            # A multiple-character fold is a string, and shouldn't need
            # incrementing anyway
            if (ref $folds_ref->[$i]) {
                die sprintf("Case fold for %x is multiple chars; should have"
                          . " a count of 1, but instead it was $count", $count)
                                                            unless $count == 1;
            }
            else {
                $cur_map++;
                $cur_list++;
            }
            $count--;
        }
    }

    # Now go through and make some adjustments.  We add synthetic entries for
    # two cases.
    # 1) Two or more code points can fold to the same multiple character,
    #    sequence, as U+FB05 and U+FB06 both fold to 'st'.  This code is only
    #    for single character folds, but FB05 and FB06 are single characters
    #    that are equivalent folded, so we add entries so that they are
    #    considered to fold to each other
    # 2) If two or more above-Latin1 code points fold to the same Latin1 range
    #    one, we also add entries so that they are considered to fold to each
    #    other.  This is so that under /aa or /l matching, where folding to
    #    their Latin1 range code point is illegal, they still can fold to each
    #    other.  This situation happens in Unicode 3.0.1, but probably no
    #    other version.
    foreach my $fold (keys %new) {
        my $folds_to_string = $fold =~ /\D/a;

        # If the bucket contains only one element, convert from an array to a
        # scalar
        if (scalar $new{$fold}->@* == 1) {
            $new{$fold} = $new{$fold}[0];
        }
        else {

            # Otherwise, sort numerically.  This places the highest code point
            # in the list at the tail end.  This is because Unicode keeps the
            # lowercase code points as higher ordinals than the uppercase, at
            # least for the ones that matter so far.  These are synthetic
            # entries, and we want to predictably have the lowercase (which is
            # more likely to be what gets folded to) in the same corresponding
            # position, so that other code can rely on that.  If some new
            # version of Unicode came along that violated this, we might have
            # to change so that the sort is based on upper vs lower instead.
            # (The lower-comes-after isn't true of native EBCDIC, but here we
            # are dealing strictly with Unicode values).
            @{$new{$fold}} = sort { $a <=> $b } $new{$fold}->@*
                                                        unless $folds_to_string;
            # We will be working with a copy of this sorted entry.
            my @source_list = $new{$fold}->@*;
            if (! $folds_to_string) {

                # This handles situation 2) listed above, which only arises if
                # what is being folded-to (the fold) is in the Latin1 range.
                if ($fold > 255 ) {
                    undef @source_list;
                }
                else {
                    # And it only arises if there are two or more folders that
                    # fold to it above Latin1.  We look at just those.
                    @source_list = grep { $_ > 255 } @source_list;
                    undef @source_list if @source_list == 1;
                }
            }

            # Here, we've found the items we want to set up synthetic folds
            # for.  Add entries so that each folds to each other.
            foreach my $cp (@source_list) {
                my @rest = grep { $cp != $_ } @source_list;
                if (@rest == 1) {
                    $new{$cp} = $rest[0];
                }
                else {
                    push @{$new{$cp}}, @rest;
                }
            }
        }

        # We don't otherwise deal with multiple-character folds
        delete $new{$fold} if $folds_to_string;
    }


    # Now we have a hash that is the inversion of the case fold property.
    # Convert it to an inversion map.

    my @sorted_folds = sort { $a <=> $b } keys %new;
    my (@invlist, @invmap);

    # We know that nothing folds to the controls (whose ordinals start at 0).
    # And the first real entries are the lowest in the hash.
    push @invlist, 0, $sorted_folds[0];
    push @invmap, 0, $new{$sorted_folds[0]};

    # Go through the remainder of the hash keys (which are the folded code
    # points)
    for (my $i = 1; $i < @sorted_folds; $i++) {

        # Get the current one, and the one prior to it.
        my $fold = $sorted_folds[$i];
        my $prev_fold = $sorted_folds[$i-1];

        # If the current one is not just 1 away from the prior one, we close
        # out the range containing the previous fold, and know that the gap
        # doesn't have anything that folds.
        if ($fold - 1 != $prev_fold) {
            push @invlist, $prev_fold + 1;
            push @invmap, 0;

            # And start a new range
            push @invlist, $fold;
            push @invmap, $new{$fold};
        }
        elsif ($new{$fold} - 1 != $new{$prev_fold}) {

            # Here the current fold is just 1 greater than the previous, but
            # the new map isn't correspondingly 1 greater than the previous,
            # the old range is ended, but since there is no gap, we don't have
            # to insert anything else.
            push @invlist, $fold;
            push @invmap, $new{$fold};

        } # else { Otherwise, this new entry just extends the previous }

        die "In IVCF: $invlist[-1] <= $invlist[-2]"
                                               if $invlist[-1] <= $invlist[-2];
    }

    # And add an entry that indicates that everything above this, to infinity,
    # does not have a case fold.
    push @invlist, $sorted_folds[-1] + 1;
    push @invmap, 0;

    # All Unicode versions have some places where multiple code points map to
    # the same one, so the format always has an 'l'
    return \@invlist, \@invmap, 'al', $default;
}

sub prop_name_for_cmp ($) { # Sort helper
    my $name = shift;

    # Returns the input lowercased, with non-alphas removed, as well as
    # everything starting with a comma

    $name =~ s/,.*//;
    $name =~ s/[[:^alpha:]]//g;
    return lc $name;
}

sub UpperLatin1 {
    my @return = mk_invlist_from_sorted_cp_list([ 128 .. 255 ]);
    return \@return;
}

sub output_table_common {

    # Common subroutine to actually output the generated rules table.

    my ($property,
        $table_value_defines_ref,
        $table_ref,
        $names_ref,
        $abbreviations_ref) = @_;
    my $size = @$table_ref;

    # Output the #define list, sorted by numeric value
    if ($table_value_defines_ref) {
        my $max_name_length = 0;
        my @defines;

        # Put in order, and at the same time find the longest name
        while (my ($enum, $value) = each %$table_value_defines_ref) {
            $defines[$value] = $enum;

            my $length = length $enum;
            $max_name_length = $length if $length > $max_name_length;
        }

        print $out_fh "\n";

        # Output, so that the values are vertically aligned in a column after
        # the longest name
        foreach my $i (0 .. @defines - 1) {
            next unless defined $defines[$i];
            printf $out_fh "#define %-*s  %2d\n",
                                      $max_name_length,
                                       $defines[$i],
                                          $i;
        }
    }

    my $column_width = 2;   # We currently allow 2 digits for the number

    # If the maximum value in the table is 1, it can be a bool.  (Being above
    # a U8 is not currently handled
    my $max_element = 0;
    for my $i (0 .. $size - 1) {
        for my $j (0 .. $size - 1) {
            next if $max_element >= $table_ref->[$i][$j];
            $max_element = $table_ref->[$i][$j];
        }
    }
    die "Need wider table column width given '$max_element"
                                    if length $max_element > $column_width;

    my $table_type = ($max_element == 1)
                     ? 'bool'
                     : 'U8';

    # If a name is longer than the width set aside for a column, its column
    # needs to have increased spacing so that the name doesn't get truncated
    # nor run into an adjacent column
    my @spacers;

    # If we are being compiled on a Unicode version earlier than that which
    # this file was designed for, it may be that some of the property values
    # aren't in the current release, and so would be undefined if we didn't
    # define them ourselves.  Earlier code has done this, making them
    # lowercase characters of length one.  We look to see if any exist, so
    # that we can add an annotation to the output table
    my $has_placeholder = 0;

    for my $i (0 .. $size - 1) {
        no warnings 'numeric';
        $has_placeholder = 1 if $names_ref->[$i] =~ / ^ [[:lower:]] $ /ax;
        $spacers[$i] = " " x (length($names_ref->[$i]) - $column_width);
    }

    print $out_fh "\nstatic const $table_type ${property}_table[$size][$size] = {\n";

    # Calculate the column heading line
    my $header_line = "/* "
                    . (" " x $max_hdr_len)  # We let the row heading meld to
                                            # the '*/' for those that are at
                                            # the max
                    . " " x 3;    # Space for '*/ '
    # Now each column
    for my $i (0 .. $size - 1) {
        $header_line .= sprintf "%s%*s",
                                $spacers[$i],
                                    $column_width + 1, # 1 for the ','
                                     $names_ref->[$i];
    }
    $header_line .= " */\n";

    # If we have annotations, output it now.
    if ($has_placeholder || scalar %$abbreviations_ref) {
        my $text = "";
        foreach my $abbr (sort keys %$abbreviations_ref) {
            $text .= "; " if $text;
            $text .= "'$abbr' stands for '$abbreviations_ref->{$abbr}'";
        }
        if ($has_placeholder) {
            $text .= "; other " if $text;
            $text .= "lowercase names are placeholders for"
                  .  " property values not defined until a later Unicode"
                  .  " release, so are irrelevant in this one, as they are"
                  .  " not assigned to any code points";
        }

        my $indent = " " x 3;
        $text = $indent . "/* $text */";

        # Wrap the text so that it is no wider than the table, which the
        # header line gives.
        my $output_width = length $header_line;
        while (length $text > $output_width) {
            my $cur_line = substr($text, 0, $output_width);

            # Find the first blank back from the right end to wrap at.
            for (my $i = $output_width -1; $i > 0; $i--) {
                if (substr($text, $i, 1) eq " ") {
                    print $out_fh substr($text, 0, $i), "\n";

                    # Set so will look at just the remaining tail (which will
                    # be indented and have a '*' after the indent
                    $text = $indent . " * " . substr($text, $i + 1);
                    last;
                }
            }
        }

        # And any remaining
        print $out_fh $text, "\n" if $text;
    }

    # We calculated the header line earlier just to get its width so that we
    # could make sure the annotations fit into that.
    print $out_fh $header_line;

    # Now output the bulk of the table.
    for my $i (0 .. $size - 1) {

        # First the row heading.
        printf $out_fh "/* %-*s*/ ", $max_hdr_len, $names_ref->[$i];
        print $out_fh "{";  # Then the brace for this row

        # Then each column
        for my $j (0 .. $size -1) {
            print $out_fh $spacers[$j];
            printf $out_fh "%*d", $column_width, $table_ref->[$i][$j];
            print $out_fh "," if $j < $size - 1;
        }
        print $out_fh " }";
        print $out_fh "," if $i < $size - 1;
        print $out_fh "\n";
    }

    print $out_fh "};\n";
}

sub output_GCB_table() {

    # Create and output the pair table for use in determining Grapheme Cluster
    # Breaks, given in http://www.unicode.org/reports/tr29/.
    my %gcb_actions = (
        GCB_NOBREAK                      => 0,
        GCB_BREAKABLE                    => 1,
        GCB_RI_then_RI                   => 2,   # Rules 12 and 13
        GCB_EX_then_EM                   => 3,   # Rule 10
    );

    # The table is constructed in reverse order of the rules, to make the
    # lower-numbered, higher priority ones override the later ones, as the
    # algorithm stops at the earliest matching rule

    my @gcb_table;
    my $table_size = @gcb_short_enums;

    # Otherwise, break everywhere.
    # GB99   Any ÷  Any
    for my $i (0 .. $table_size - 1) {
        for my $j (0 .. $table_size - 1) {
            $gcb_table[$i][$j] = 1;
        }
    }

    # Do not break within emoji flag sequences. That is, do not break between
    # regional indicator (RI) symbols if there is an odd number of RI
    # characters before the break point.  Must be resolved in runtime code.
    #
    # GB12 sot (RI RI)* RI × RI
    # GB13 [^RI] (RI RI)* RI × RI
    $gcb_table[$gcb_enums{'Regional_Indicator'}]
              [$gcb_enums{'Regional_Indicator'}] = $gcb_actions{GCB_RI_then_RI};

    # Do not break within emoji modifier sequences or emoji zwj sequences.
    # GB11  ZWJ  × ( Glue_After_Zwj | E_Base_GAZ )
    $gcb_table[$gcb_enums{'ZWJ'}][$gcb_enums{'Glue_After_Zwj'}] = 0;
    $gcb_table[$gcb_enums{'ZWJ'}][$gcb_enums{'E_Base_GAZ'}] = 0;

    # GB10  ( E_Base | E_Base_GAZ ) Extend* ×  E_Modifier
    $gcb_table[$gcb_enums{'Extend'}][$gcb_enums{'E_Modifier'}]
                                                = $gcb_actions{GCB_EX_then_EM};
    $gcb_table[$gcb_enums{'E_Base'}][$gcb_enums{'E_Modifier'}] = 0;
    $gcb_table[$gcb_enums{'E_Base_GAZ'}][$gcb_enums{'E_Modifier'}] = 0;

    # Do not break before extending characters or ZWJ.
    # Do not break before SpacingMarks, or after Prepend characters.
    # GB9b  Prepend  ×
    # GB9a  × SpacingMark
    # GB9   ×  ( Extend | ZWJ )
    for my $i (0 .. @gcb_table - 1) {
        $gcb_table[$gcb_enums{'Prepend'}][$i] = 0;
        $gcb_table[$i][$gcb_enums{'SpacingMark'}] = 0;
        $gcb_table[$i][$gcb_enums{'Extend'}] = 0;
        $gcb_table[$i][$gcb_enums{'ZWJ'}] = 0;
    }

    # Do not break Hangul syllable sequences.
    # GB8  ( LVT | T)  ×  T
    $gcb_table[$gcb_enums{'LVT'}][$gcb_enums{'T'}] = 0;
    $gcb_table[$gcb_enums{'T'}][$gcb_enums{'T'}] = 0;

    # GB7  ( LV | V )  ×  ( V | T )
    $gcb_table[$gcb_enums{'LV'}][$gcb_enums{'V'}] = 0;
    $gcb_table[$gcb_enums{'LV'}][$gcb_enums{'T'}] = 0;
    $gcb_table[$gcb_enums{'V'}][$gcb_enums{'V'}] = 0;
    $gcb_table[$gcb_enums{'V'}][$gcb_enums{'T'}] = 0;

    # GB6  L  ×  ( L | V | LV | LVT )
    $gcb_table[$gcb_enums{'L'}][$gcb_enums{'L'}] = 0;
    $gcb_table[$gcb_enums{'L'}][$gcb_enums{'V'}] = 0;
    $gcb_table[$gcb_enums{'L'}][$gcb_enums{'LV'}] = 0;
    $gcb_table[$gcb_enums{'L'}][$gcb_enums{'LVT'}] = 0;

    # Do not break between a CR and LF. Otherwise, break before and after
    # controls.
    # GB5   ÷  ( Control | CR | LF )
    # GB4  ( Control | CR | LF )  ÷
    for my $i (0 .. @gcb_table - 1) {
        $gcb_table[$i][$gcb_enums{'Control'}] = 1;
        $gcb_table[$i][$gcb_enums{'CR'}] = 1;
        $gcb_table[$i][$gcb_enums{'LF'}] = 1;
        $gcb_table[$gcb_enums{'Control'}][$i] = 1;
        $gcb_table[$gcb_enums{'CR'}][$i] = 1;
        $gcb_table[$gcb_enums{'LF'}][$i] = 1;
    }

    # GB3  CR  ×  LF
    $gcb_table[$gcb_enums{'CR'}][$gcb_enums{'LF'}] = 0;

    # Break at the start and end of text, unless the text is empty
    # GB1  sot  ÷
    # GB2   ÷  eot
    for my $i (0 .. @gcb_table - 1) {
        $gcb_table[$i][$gcb_enums{'EDGE'}] = 1;
        $gcb_table[$gcb_enums{'EDGE'}][$i] = 1;
    }
    $gcb_table[$gcb_enums{'EDGE'}][$gcb_enums{'EDGE'}] = 0;

    output_table_common('GCB', \%gcb_actions,
                        \@gcb_table, \@gcb_short_enums, \%gcb_abbreviations);
}

sub output_LB_table() {

    # Create and output the enums, #defines, and pair table for use in
    # determining Line Breaks.  This uses the default line break algorithm,
    # given in http://www.unicode.org/reports/tr14/, but tailored by example 7
    # in that page, as the Unicode-furnished tests assume that tailoring.

    # The result is really just true or false.  But we follow along with tr14,
    # creating a rule which is false for something like X SP* X.  That gets
    # encoding 2.  The rest of the actions are synthetic ones that indicate
    # some context handling is required.  These each are added to the
    # underlying 0, 1, or 2, instead of replacing them, so that the underlying
    # value can be retrieved.  Actually only rules from 7 through 18 (which
    # are the ones where space matter) are possible to have 2 added to them.
    # The others below add just 0 or 1.  It might be possible for one
    # synthetic rule to be added to another, yielding a larger value.  This
    # doesn't happen in the Unicode 8.0 rule set, and as you can see from the
    # names of the middle grouping below, it is impossible for that to occur
    # for them because they all start with mutually exclusive classes.  That
    # the final rule can't be added to any of the others isn't obvious from
    # its name, so it is assigned a power of 2 higher than the others can get
    # to so any addition would preserve all data.  (And the code will reach an
    # assert(0) on debugging builds should this happen.)
    my %lb_actions = (
        LB_NOBREAK                      => 0,
        LB_BREAKABLE                    => 1,
        LB_NOBREAK_EVEN_WITH_SP_BETWEEN => 2,

        LB_CM_ZWJ_foo                   => 3,   # Rule 9
        LB_SP_foo                       => 6,   # Rule 18
        LB_PR_or_PO_then_OP_or_HY       => 9,   # Rule 25
        LB_SY_or_IS_then_various        => 11,  # Rule 25
        LB_HY_or_BA_then_foo            => 13,  # Rule 21
        LB_RI_then_RI	                => 15,  # Rule 30a

        LB_various_then_PO_or_PR        => (1<<5),  # Rule 25
    );

    # Construct the LB pair table.  This is based on the rules in
    # http://www.unicode.org/reports/tr14/, but modified as those rules are
    # designed for someone taking a string of text and sequentially going
    # through it to find the break opportunities, whereas, Perl requires
    # determining if a given random spot is a break opportunity, without
    # knowing all the entire string before it.
    #
    # The table is constructed in reverse order of the rules, to make the
    # lower-numbered, higher priority ones override the later ones, as the
    # algorithm stops at the earliest matching rule

    my @lb_table;
    my $table_size = @lb_short_enums;

    # LB31. Break everywhere else
    for my $i (0 .. $table_size - 1) {
        for my $j (0 .. $table_size - 1) {
            $lb_table[$i][$j] = $lb_actions{'LB_BREAKABLE'};
        }
    }

    # LB30b Do not break between an emoji base and an emoji modifier.
    # EB × EM
    $lb_table[$lb_enums{'E_Base'}][$lb_enums{'E_Modifier'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # LB30a Break between two regional indicator symbols if and only if there
    # are an even number of regional indicators preceding the position of the
    # break.
    # sot (RI RI)* RI × RI
    # [^RI] (RI RI)* RI × RI
    $lb_table[$lb_enums{'Regional_Indicator'}]
             [$lb_enums{'Regional_Indicator'}] = $lb_actions{'LB_RI_then_RI'};

    # LB30 Do not break between letters, numbers, or ordinary symbols and
    # opening or closing parentheses.
    # (AL | HL | NU) × OP
    $lb_table[$lb_enums{'Alphabetic'}][$lb_enums{'Open_Punctuation'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Hebrew_Letter'}][$lb_enums{'Open_Punctuation'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Numeric'}][$lb_enums{'Open_Punctuation'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # CP × (AL | HL | NU)
    $lb_table[$lb_enums{'Close_Parenthesis'}][$lb_enums{'Alphabetic'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Close_Parenthesis'}][$lb_enums{'Hebrew_Letter'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Close_Parenthesis'}][$lb_enums{'Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # LB29 Do not break between numeric punctuation and alphabetics (“e.g.”).
    # IS × (AL | HL)
    $lb_table[$lb_enums{'Infix_Numeric'}][$lb_enums{'Alphabetic'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Infix_Numeric'}][$lb_enums{'Hebrew_Letter'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # LB28 Do not break between alphabetics (“at”).
    # (AL | HL) × (AL | HL)
    $lb_table[$lb_enums{'Alphabetic'}][$lb_enums{'Alphabetic'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Hebrew_Letter'}][$lb_enums{'Alphabetic'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Alphabetic'}][$lb_enums{'Hebrew_Letter'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Hebrew_Letter'}][$lb_enums{'Hebrew_Letter'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # LB27 Treat a Korean Syllable Block the same as ID.
    # (JL | JV | JT | H2 | H3) × IN
    $lb_table[$lb_enums{'JL'}][$lb_enums{'Inseparable'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'JV'}][$lb_enums{'Inseparable'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'JT'}][$lb_enums{'Inseparable'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'H2'}][$lb_enums{'Inseparable'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'H3'}][$lb_enums{'Inseparable'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # (JL | JV | JT | H2 | H3) × PO
    $lb_table[$lb_enums{'JL'}][$lb_enums{'Postfix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'JV'}][$lb_enums{'Postfix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'JT'}][$lb_enums{'Postfix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'H2'}][$lb_enums{'Postfix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'H3'}][$lb_enums{'Postfix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # PR × (JL | JV | JT | H2 | H3)
    $lb_table[$lb_enums{'Prefix_Numeric'}][$lb_enums{'JL'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Prefix_Numeric'}][$lb_enums{'JV'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Prefix_Numeric'}][$lb_enums{'JT'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Prefix_Numeric'}][$lb_enums{'H2'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Prefix_Numeric'}][$lb_enums{'H3'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # LB26 Do not break a Korean syllable.
    # JL × (JL | JV | H2 | H3)
    $lb_table[$lb_enums{'JL'}][$lb_enums{'JL'}] = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'JL'}][$lb_enums{'JV'}] = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'JL'}][$lb_enums{'H2'}] = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'JL'}][$lb_enums{'H3'}] = $lb_actions{'LB_NOBREAK'};

    # (JV | H2) × (JV | JT)
    $lb_table[$lb_enums{'JV'}][$lb_enums{'JV'}] = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'H2'}][$lb_enums{'JV'}] = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'JV'}][$lb_enums{'JT'}] = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'H2'}][$lb_enums{'JT'}] = $lb_actions{'LB_NOBREAK'};

    # (JT | H3) × JT
    $lb_table[$lb_enums{'JT'}][$lb_enums{'JT'}] = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'H3'}][$lb_enums{'JT'}] = $lb_actions{'LB_NOBREAK'};

    # LB25 Do not break between the following pairs of classes relevant to
    # numbers, as tailored by example 7 in
    # http://www.unicode.org/reports/tr14/#Examples
    # We follow that tailoring because Unicode's test cases expect it
    # (PR | PO) × ( OP | HY )? NU
    $lb_table[$lb_enums{'Prefix_Numeric'}][$lb_enums{'Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Postfix_Numeric'}][$lb_enums{'Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};

        # Given that (OP | HY )? is optional, we have to test for it in code.
        # We add in the action (instead of overriding) for this, so that in
        # the code we can recover the underlying break value.
    $lb_table[$lb_enums{'Prefix_Numeric'}][$lb_enums{'Open_Punctuation'}]
                                    += $lb_actions{'LB_PR_or_PO_then_OP_or_HY'};
    $lb_table[$lb_enums{'Postfix_Numeric'}][$lb_enums{'Open_Punctuation'}]
                                    += $lb_actions{'LB_PR_or_PO_then_OP_or_HY'};
    $lb_table[$lb_enums{'Prefix_Numeric'}][$lb_enums{'Hyphen'}]
                                    += $lb_actions{'LB_PR_or_PO_then_OP_or_HY'};
    $lb_table[$lb_enums{'Postfix_Numeric'}][$lb_enums{'Hyphen'}]
                                    += $lb_actions{'LB_PR_or_PO_then_OP_or_HY'};

    # ( OP | HY ) × NU
    $lb_table[$lb_enums{'Open_Punctuation'}][$lb_enums{'Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Hyphen'}][$lb_enums{'Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # NU (NU | SY | IS)* × (NU | SY | IS | CL | CP )
    # which can be rewritten as:
    # NU (SY | IS)* × (NU | SY | IS | CL | CP )
    $lb_table[$lb_enums{'Numeric'}][$lb_enums{'Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Numeric'}][$lb_enums{'Break_Symbols'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Numeric'}][$lb_enums{'Infix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Numeric'}][$lb_enums{'Close_Punctuation'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Numeric'}][$lb_enums{'Close_Parenthesis'}]
                                                = $lb_actions{'LB_NOBREAK'};

        # Like earlier where we have to test in code, we add in the action so
        # that we can recover the underlying values.  This is done in rules
        # below, as well.  The code assumes that we haven't added 2 actions.
        # Shoul a later Unicode release break that assumption, then tests
        # should start failing.
    $lb_table[$lb_enums{'Break_Symbols'}][$lb_enums{'Numeric'}]
                                    += $lb_actions{'LB_SY_or_IS_then_various'};
    $lb_table[$lb_enums{'Break_Symbols'}][$lb_enums{'Break_Symbols'}]
                                    += $lb_actions{'LB_SY_or_IS_then_various'};
    $lb_table[$lb_enums{'Break_Symbols'}][$lb_enums{'Infix_Numeric'}]
                                    += $lb_actions{'LB_SY_or_IS_then_various'};
    $lb_table[$lb_enums{'Break_Symbols'}][$lb_enums{'Close_Punctuation'}]
                                    += $lb_actions{'LB_SY_or_IS_then_various'};
    $lb_table[$lb_enums{'Break_Symbols'}][$lb_enums{'Close_Parenthesis'}]
                                    += $lb_actions{'LB_SY_or_IS_then_various'};
    $lb_table[$lb_enums{'Infix_Numeric'}][$lb_enums{'Numeric'}]
                                    += $lb_actions{'LB_SY_or_IS_then_various'};
    $lb_table[$lb_enums{'Infix_Numeric'}][$lb_enums{'Break_Symbols'}]
                                    += $lb_actions{'LB_SY_or_IS_then_various'};
    $lb_table[$lb_enums{'Infix_Numeric'}][$lb_enums{'Infix_Numeric'}]
                                    += $lb_actions{'LB_SY_or_IS_then_various'};
    $lb_table[$lb_enums{'Infix_Numeric'}][$lb_enums{'Close_Punctuation'}]
                                    += $lb_actions{'LB_SY_or_IS_then_various'};
    $lb_table[$lb_enums{'Infix_Numeric'}][$lb_enums{'Close_Parenthesis'}]
                                    += $lb_actions{'LB_SY_or_IS_then_various'};

    # NU (NU | SY | IS)* (CL | CP)? × (PO | PR)
    # which can be rewritten as:
    # NU (SY | IS)* (CL | CP)? × (PO | PR)
    $lb_table[$lb_enums{'Numeric'}][$lb_enums{'Postfix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Numeric'}][$lb_enums{'Prefix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};

    $lb_table[$lb_enums{'Close_Parenthesis'}][$lb_enums{'Postfix_Numeric'}]
                                    += $lb_actions{'LB_various_then_PO_or_PR'};
    $lb_table[$lb_enums{'Close_Punctuation'}][$lb_enums{'Postfix_Numeric'}]
                                    += $lb_actions{'LB_various_then_PO_or_PR'};
    $lb_table[$lb_enums{'Infix_Numeric'}][$lb_enums{'Postfix_Numeric'}]
                                    += $lb_actions{'LB_various_then_PO_or_PR'};
    $lb_table[$lb_enums{'Break_Symbols'}][$lb_enums{'Postfix_Numeric'}]
                                    += $lb_actions{'LB_various_then_PO_or_PR'};

    $lb_table[$lb_enums{'Close_Parenthesis'}][$lb_enums{'Prefix_Numeric'}]
                                    += $lb_actions{'LB_various_then_PO_or_PR'};
    $lb_table[$lb_enums{'Close_Punctuation'}][$lb_enums{'Prefix_Numeric'}]
                                    += $lb_actions{'LB_various_then_PO_or_PR'};
    $lb_table[$lb_enums{'Infix_Numeric'}][$lb_enums{'Prefix_Numeric'}]
                                    += $lb_actions{'LB_various_then_PO_or_PR'};
    $lb_table[$lb_enums{'Break_Symbols'}][$lb_enums{'Prefix_Numeric'}]
                                    += $lb_actions{'LB_various_then_PO_or_PR'};

    # LB24 Do not break between numeric prefix/postfix and letters, or between
    # letters and prefix/postfix.
    # (PR | PO) × (AL | HL)
    $lb_table[$lb_enums{'Prefix_Numeric'}][$lb_enums{'Alphabetic'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Prefix_Numeric'}][$lb_enums{'Hebrew_Letter'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Postfix_Numeric'}][$lb_enums{'Alphabetic'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Postfix_Numeric'}][$lb_enums{'Hebrew_Letter'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # (AL | HL) × (PR | PO)
    $lb_table[$lb_enums{'Alphabetic'}][$lb_enums{'Prefix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Hebrew_Letter'}][$lb_enums{'Prefix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Alphabetic'}][$lb_enums{'Postfix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Hebrew_Letter'}][$lb_enums{'Postfix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # LB23a Do not break between numeric prefixes and ideographs, or between
    # ideographs and numeric postfixes.
    # PR × (ID | EB | EM)
    $lb_table[$lb_enums{'Prefix_Numeric'}][$lb_enums{'Ideographic'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Prefix_Numeric'}][$lb_enums{'E_Base'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Prefix_Numeric'}][$lb_enums{'E_Modifier'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # (ID | EB | EM) × PO
    $lb_table[$lb_enums{'Ideographic'}][$lb_enums{'Postfix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'E_Base'}][$lb_enums{'Postfix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'E_Modifier'}][$lb_enums{'Postfix_Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # LB23 Do not break between digits and letters
    # (AL | HL) × NU
    $lb_table[$lb_enums{'Alphabetic'}][$lb_enums{'Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Hebrew_Letter'}][$lb_enums{'Numeric'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # NU × (AL | HL)
    $lb_table[$lb_enums{'Numeric'}][$lb_enums{'Alphabetic'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Numeric'}][$lb_enums{'Hebrew_Letter'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # LB22 Do not break between two ellipses, or between letters, numbers or
    # exclamations and ellipsis.
    # (AL | HL) × IN
    $lb_table[$lb_enums{'Alphabetic'}][$lb_enums{'Inseparable'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'Hebrew_Letter'}][$lb_enums{'Inseparable'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # Exclamation × IN
    $lb_table[$lb_enums{'Exclamation'}][$lb_enums{'Inseparable'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # (ID | EB | EM) × IN
    $lb_table[$lb_enums{'Ideographic'}][$lb_enums{'Inseparable'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'E_Base'}][$lb_enums{'Inseparable'}]
                                                = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'E_Modifier'}][$lb_enums{'Inseparable'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # IN × IN
    $lb_table[$lb_enums{'Inseparable'}][$lb_enums{'Inseparable'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # NU × IN
    $lb_table[$lb_enums{'Numeric'}][$lb_enums{'Inseparable'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # LB21b Don’t break between Solidus and Hebrew letters.
    # SY × HL
    $lb_table[$lb_enums{'Break_Symbols'}][$lb_enums{'Hebrew_Letter'}]
                                                = $lb_actions{'LB_NOBREAK'};

    # LB21a Don't break after Hebrew + Hyphen.
    # HL (HY | BA) ×
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$lb_enums{'Hyphen'}][$i]
                                        += $lb_actions{'LB_HY_or_BA_then_foo'};
        $lb_table[$lb_enums{'Break_After'}][$i]
                                        += $lb_actions{'LB_HY_or_BA_then_foo'};
    }

    # LB21 Do not break before hyphen-minus, other hyphens, fixed-width
    # spaces, small kana, and other non-starters, or after acute accents.
    # × BA
    # × HY
    # × NS
    # BB ×
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$i][$lb_enums{'Break_After'}] = $lb_actions{'LB_NOBREAK'};
        $lb_table[$i][$lb_enums{'Hyphen'}] = $lb_actions{'LB_NOBREAK'};
        $lb_table[$i][$lb_enums{'Nonstarter'}] = $lb_actions{'LB_NOBREAK'};
        $lb_table[$lb_enums{'Break_Before'}][$i] = $lb_actions{'LB_NOBREAK'};
    }

    # LB20 Break before and after unresolved CB.
    # ÷ CB
    # CB ÷
    # Conditional breaks should be resolved external to the line breaking
    # rules. However, the default action is to treat unresolved CB as breaking
    # before and after.
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$i][$lb_enums{'Contingent_Break'}]
                                                = $lb_actions{'LB_BREAKABLE'};
        $lb_table[$lb_enums{'Contingent_Break'}][$i]
                                                = $lb_actions{'LB_BREAKABLE'};
    }

    # LB19 Do not break before or after quotation marks, such as ‘ ” ’.
    # × QU
    # QU ×
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$i][$lb_enums{'Quotation'}] = $lb_actions{'LB_NOBREAK'};
        $lb_table[$lb_enums{'Quotation'}][$i] = $lb_actions{'LB_NOBREAK'};
    }

    # LB18 Break after spaces
    # SP ÷
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$lb_enums{'Space'}][$i] = $lb_actions{'LB_BREAKABLE'};
    }

    # LB17 Do not break within ‘——’, even with intervening spaces.
    # B2 SP* × B2
    $lb_table[$lb_enums{'Break_Both'}][$lb_enums{'Break_Both'}]
                           = $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'};

    # LB16 Do not break between closing punctuation and a nonstarter even with
    # intervening spaces.
    # (CL | CP) SP* × NS
    $lb_table[$lb_enums{'Close_Punctuation'}][$lb_enums{'Nonstarter'}]
                            = $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'};
    $lb_table[$lb_enums{'Close_Parenthesis'}][$lb_enums{'Nonstarter'}]
                            = $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'};


    # LB15 Do not break within ‘”[’, even with intervening spaces.
    # QU SP* × OP
    $lb_table[$lb_enums{'Quotation'}][$lb_enums{'Open_Punctuation'}]
                            = $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'};

    # LB14 Do not break after ‘[’, even after spaces.
    # OP SP* ×
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$lb_enums{'Open_Punctuation'}][$i]
                            = $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'};
    }

    # LB13 Do not break before ‘]’ or ‘!’ or ‘;’ or ‘/’, even after spaces, as
    # tailored by example 7 in http://www.unicode.org/reports/tr14/#Examples
    # [^NU] × CL
    # [^NU] × CP
    # × EX
    # [^NU] × IS
    # [^NU] × SY
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$i][$lb_enums{'Exclamation'}]
                            = $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'};

        next if $i == $lb_enums{'Numeric'};

        $lb_table[$i][$lb_enums{'Close_Punctuation'}]
                            = $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'};
        $lb_table[$i][$lb_enums{'Close_Parenthesis'}]
                            = $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'};
        $lb_table[$i][$lb_enums{'Infix_Numeric'}]
                            = $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'};
        $lb_table[$i][$lb_enums{'Break_Symbols'}]
                            = $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'};
    }

    # LB12a Do not break before NBSP and related characters, except after
    # spaces and hyphens.
    # [^SP BA HY] × GL
    for my $i (0 .. @lb_table - 1) {
        next if    $i == $lb_enums{'Space'}
                || $i == $lb_enums{'Break_After'}
                || $i == $lb_enums{'Hyphen'};

        # We don't break, but if a property above has said don't break even
        # with space between, don't override that (also in the next few rules)
        next if $lb_table[$i][$lb_enums{'Glue'}]
                            == $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'};
        $lb_table[$i][$lb_enums{'Glue'}] = $lb_actions{'LB_NOBREAK'};
    }

    # LB12 Do not break after NBSP and related characters.
    # GL ×
    for my $i (0 .. @lb_table - 1) {
        next if $lb_table[$lb_enums{'Glue'}][$i]
                            == $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'};
        $lb_table[$lb_enums{'Glue'}][$i] = $lb_actions{'LB_NOBREAK'};
    }

    # LB11 Do not break before or after Word joiner and related characters.
    # × WJ
    # WJ ×
    for my $i (0 .. @lb_table - 1) {
        if ($lb_table[$i][$lb_enums{'Word_Joiner'}]
                        != $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'})
        {
            $lb_table[$i][$lb_enums{'Word_Joiner'}] = $lb_actions{'LB_NOBREAK'};
        }
        if ($lb_table[$lb_enums{'Word_Joiner'}][$i]
                        != $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'})
        {
            $lb_table[$lb_enums{'Word_Joiner'}][$i] = $lb_actions{'LB_NOBREAK'};
        }
    }

    # Special case this here to avoid having to do a special case in the code,
    # by making this the same as other things with a SP in front of them that
    # don't break, we avoid an extra test
    $lb_table[$lb_enums{'Space'}][$lb_enums{'Word_Joiner'}]
                            = $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'};

    # LB9 and LB10 are done in the same loop
    #
    # LB9 Do not break a combining character sequence; treat it as if it has
    # the line breaking class of the base character in all of the
    # higher-numbered rules.  Treat ZWJ as if it were CM
    # Treat X (CM|ZWJ)* as if it were X.
    # where X is any line break class except BK, CR, LF, NL, SP, or ZW.

    # LB10 Treat any remaining combining mark or ZWJ as AL.  This catches the
    # case where a CM or ZWJ is the first character on the line or follows SP,
    # BK, CR, LF, NL, or ZW.
    for my $i (0 .. @lb_table - 1) {

        # When the CM or ZWJ is the first in the pair, we don't know without
        # looking behind whether the CM or ZWJ is going to attach to an
        # earlier character, or not.  So have to figure this out at runtime in
        # the code
        $lb_table[$lb_enums{'Combining_Mark'}][$i]
                                        = $lb_actions{'LB_CM_ZWJ_foo'};
        $lb_table[$lb_enums{'ZWJ'}][$i] = $lb_actions{'LB_CM_ZWJ_foo'};

        if (   $i == $lb_enums{'Mandatory_Break'}
            || $i == $lb_enums{'EDGE'}
            || $i == $lb_enums{'Carriage_Return'}
            || $i == $lb_enums{'Line_Feed'}
            || $i == $lb_enums{'Next_Line'}
            || $i == $lb_enums{'Space'}
            || $i == $lb_enums{'ZWSpace'})
        {
            # For these classes, a following CM doesn't combine, and should do
            # whatever 'Alphabetic' would do.
            $lb_table[$i][$lb_enums{'Combining_Mark'}]
                                    = $lb_table[$i][$lb_enums{'Alphabetic'}];
            $lb_table[$i][$lb_enums{'ZWJ'}]
                                    = $lb_table[$i][$lb_enums{'Alphabetic'}];
        }
        else {
            # For these classes, the CM or ZWJ combines, so doesn't break,
            # inheriting the type of nobreak from the master character.
            if ($lb_table[$i][$lb_enums{'Combining_Mark'}]
                            != $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'})
            {
                $lb_table[$i][$lb_enums{'Combining_Mark'}]
                                        = $lb_actions{'LB_NOBREAK'};
            }
            if ($lb_table[$i][$lb_enums{'ZWJ'}]
                            != $lb_actions{'LB_NOBREAK_EVEN_WITH_SP_BETWEEN'})
            {
                $lb_table[$i][$lb_enums{'ZWJ'}]
                                        = $lb_actions{'LB_NOBREAK'};
            }
        }
    }

    # LB8a Do not break between a zero width joiner and an ideograph, emoji
    # base or emoji modifier. This rule prevents breaks within emoji joiner
    # sequences.
    # ZWJ × (ID | EB | EM)
    $lb_table[$lb_enums{'ZWJ'}][$lb_enums{'Ideographic'}]
                                                    = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'ZWJ'}][$lb_enums{'E_Base'}]
                                                    = $lb_actions{'LB_NOBREAK'};
    $lb_table[$lb_enums{'ZWJ'}][$lb_enums{'E_Modifier'}]
                                                    = $lb_actions{'LB_NOBREAK'};

    # LB8 Break before any character following a zero-width space, even if one
    # or more spaces intervene.
    # ZW SP* ÷
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$lb_enums{'ZWSpace'}][$i] = $lb_actions{'LB_BREAKABLE'};
    }

    # Because of LB8-10, we need to look at context for "SP x", and this must
    # be done in the code.  So override the existing rules for that, by adding
    # a constant to get new rules that tell the code it needs to look at
    # context.  By adding this action instead of replacing the existing one,
    # we can get back to the original rule if necessary.
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$lb_enums{'Space'}][$i] += $lb_actions{'LB_SP_foo'};
    }

    # LB7 Do not break before spaces or zero width space.
    # × SP
    # × ZW
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$i][$lb_enums{'Space'}] = $lb_actions{'LB_NOBREAK'};
        $lb_table[$i][$lb_enums{'ZWSpace'}] = $lb_actions{'LB_NOBREAK'};
    }

    # LB6 Do not break before hard line breaks.
    # × ( BK | CR | LF | NL )
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$i][$lb_enums{'Mandatory_Break'}] = $lb_actions{'LB_NOBREAK'};
        $lb_table[$i][$lb_enums{'Carriage_Return'}] = $lb_actions{'LB_NOBREAK'};
        $lb_table[$i][$lb_enums{'Line_Feed'}] = $lb_actions{'LB_NOBREAK'};
        $lb_table[$i][$lb_enums{'Next_Line'}] = $lb_actions{'LB_NOBREAK'};
    }

    # LB5 Treat CR followed by LF, as well as CR, LF, and NL as hard line breaks.
    # CR × LF
    # CR !
    # LF !
    # NL !
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$lb_enums{'Carriage_Return'}][$i]
                                = $lb_actions{'LB_BREAKABLE'};
        $lb_table[$lb_enums{'Line_Feed'}][$i] = $lb_actions{'LB_BREAKABLE'};
        $lb_table[$lb_enums{'Next_Line'}][$i] = $lb_actions{'LB_BREAKABLE'};
    }
    $lb_table[$lb_enums{'Carriage_Return'}][$lb_enums{'Line_Feed'}]
                            = $lb_actions{'LB_NOBREAK'};

    # LB4 Always break after hard line breaks.
    # BK !
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$lb_enums{'Mandatory_Break'}][$i]
                                = $lb_actions{'LB_BREAKABLE'};
    }

    # LB3 Always break at the end of text.
    # ! eot
    # LB2 Never break at the start of text.
    # sot ×
    for my $i (0 .. @lb_table - 1) {
        $lb_table[$i][$lb_enums{'EDGE'}] = $lb_actions{'LB_BREAKABLE'};
        $lb_table[$lb_enums{'EDGE'}][$i] = $lb_actions{'LB_NOBREAK'};
    }

    # LB1 Assign a line breaking class to each code point of the input.
    # Resolve AI, CB, CJ, SA, SG, and XX into other line breaking classes
    # depending on criteria outside the scope of this algorithm.
    #
    # In the absence of such criteria all characters with a specific
    # combination of original class and General_Category property value are
    # resolved as follows:
    # Original 	   Resolved  General_Category
    # AI, SG, XX      AL      Any
    # SA              CM      Only Mn or Mc
    # SA              AL      Any except Mn and Mc
    # CJ              NS      Any
    #
    # This is done in mktables, so we never see any of the remapped-from
    # classes.

    output_table_common('LB', \%lb_actions,
                        \@lb_table, \@lb_short_enums, \%lb_abbreviations);
}

sub output_WB_table() {

    # Create and output the enums, #defines, and pair table for use in
    # determining Word Breaks, given in http://www.unicode.org/reports/tr29/.

    # This uses the same mechanism in the other bounds tables generated by
    # this file.  The actions that could override a 0 or 1 are added to those
    # numbers; the actions that clearly don't depend on the underlying rule
    # simply overwrite
    my %wb_actions = (
        WB_NOBREAK                      => 0,
        WB_BREAKABLE                    => 1,
        WB_hs_then_hs                   => 2,
        WB_Ex_or_FO_or_ZWJ_then_foo	=> 3,
        WB_DQ_then_HL	                => 4,
        WB_HL_then_DQ	                => 6,
        WB_LE_or_HL_then_MB_or_ML_or_SQ	=> 8,
        WB_MB_or_ML_or_SQ_then_LE_or_HL	=> 10,
        WB_MB_or_MN_or_SQ_then_NU	=> 12,
        WB_NU_then_MB_or_MN_or_SQ	=> 14,
        WB_RI_then_RI	                => 16,
    );

    # Construct the WB pair table.
    # The table is constructed in reverse order of the rules, to make the
    # lower-numbered, higher priority ones override the later ones, as the
    # algorithm stops at the earliest matching rule

    my @wb_table;
    my $table_size = @wb_short_enums - 1;   # -1 because we don't use UNKNOWN
    die "UNKNOWN must be final WB enum" unless $wb_short_enums[-1] =~ /unk/i;

    # Otherwise, break everywhere (including around ideographs).
    # WB99  Any  ÷  Any
    for my $i (0 .. $table_size - 1) {
        for my $j (0 .. $table_size - 1) {
            $wb_table[$i][$j] = $wb_actions{'WB_BREAKABLE'};
        }
    }

    # Do not break within emoji flag sequences. That is, do not break between
    # regional indicator (RI) symbols if there is an odd number of RI
    # characters before the break point.
    # WB16  [^RI] (RI RI)* RI × RI
    # WB15   sot    (RI RI)* RI × RI
    $wb_table[$wb_enums{'Regional_Indicator'}]
             [$wb_enums{'Regional_Indicator'}] = $wb_actions{'WB_RI_then_RI'};

    # Do not break within emoji modifier sequences.
    # WB14  ( E_Base | EBG )  ×  E_Modifier
    $wb_table[$wb_enums{'E_Base'}][$wb_enums{'E_Modifier'}]
                                                    = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'E_Base_GAZ'}][$wb_enums{'E_Modifier'}]
                                                    = $wb_actions{'WB_NOBREAK'};

    # Do not break from extenders.
    # WB13b  ExtendNumLet  ×  (ALetter | Hebrew_Letter | Numeric | Katakana)
    $wb_table[$wb_enums{'ExtendNumLet'}][$wb_enums{'ALetter'}]
                                                = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'ExtendNumLet'}][$wb_enums{'Hebrew_Letter'}]
                                                = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'ExtendNumLet'}][$wb_enums{'Numeric'}]
                                                = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'ExtendNumLet'}][$wb_enums{'Katakana'}]
                                                = $wb_actions{'WB_NOBREAK'};

    # WB13a  (ALetter | Hebrew_Letter | Numeric | Katakana | ExtendNumLet)
    #        × # ExtendNumLet
    $wb_table[$wb_enums{'ALetter'}][$wb_enums{'ExtendNumLet'}]
                                                = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'Hebrew_Letter'}][$wb_enums{'ExtendNumLet'}]
                                                = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'Numeric'}][$wb_enums{'ExtendNumLet'}]
                                                = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'Katakana'}][$wb_enums{'ExtendNumLet'}]
                                                = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'ExtendNumLet'}][$wb_enums{'ExtendNumLet'}]
                                                = $wb_actions{'WB_NOBREAK'};

    # Do not break between Katakana.
    # WB13  Katakana  ×  Katakana
    $wb_table[$wb_enums{'Katakana'}][$wb_enums{'Katakana'}]
                                                = $wb_actions{'WB_NOBREAK'};

    # Do not break within sequences, such as “3.2” or “3,456.789”.
    # WB12  Numeric  ×  (MidNum | MidNumLet | Single_Quote) Numeric
    $wb_table[$wb_enums{'Numeric'}][$wb_enums{'MidNumLet'}]
                                    += $wb_actions{'WB_NU_then_MB_or_MN_or_SQ'};
    $wb_table[$wb_enums{'Numeric'}][$wb_enums{'MidNum'}]
                                    += $wb_actions{'WB_NU_then_MB_or_MN_or_SQ'};
    $wb_table[$wb_enums{'Numeric'}][$wb_enums{'Single_Quote'}]
                                    += $wb_actions{'WB_NU_then_MB_or_MN_or_SQ'};

    # WB11  Numeric (MidNum | (MidNumLet | Single_Quote))  ×  Numeric
    $wb_table[$wb_enums{'MidNumLet'}][$wb_enums{'Numeric'}]
                                    += $wb_actions{'WB_MB_or_MN_or_SQ_then_NU'};
    $wb_table[$wb_enums{'MidNum'}][$wb_enums{'Numeric'}]
                                    += $wb_actions{'WB_MB_or_MN_or_SQ_then_NU'};
    $wb_table[$wb_enums{'Single_Quote'}][$wb_enums{'Numeric'}]
                                    += $wb_actions{'WB_MB_or_MN_or_SQ_then_NU'};

    # Do not break within sequences of digits, or digits adjacent to letters
    # (“3a”, or “A3”).
    # WB10  Numeric  ×  (ALetter | Hebrew_Letter)
    $wb_table[$wb_enums{'Numeric'}][$wb_enums{'ALetter'}]
                                                = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'Numeric'}][$wb_enums{'Hebrew_Letter'}]
                                                = $wb_actions{'WB_NOBREAK'};

    # WB9  (ALetter | Hebrew_Letter)  ×  Numeric
    $wb_table[$wb_enums{'ALetter'}][$wb_enums{'Numeric'}]
                                                = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'Hebrew_Letter'}][$wb_enums{'Numeric'}]
                                                = $wb_actions{'WB_NOBREAK'};

    # WB8  Numeric  ×  Numeric
    $wb_table[$wb_enums{'Numeric'}][$wb_enums{'Numeric'}]
                                                = $wb_actions{'WB_NOBREAK'};

    # Do not break letters across certain punctuation.
    # WB7c  Hebrew_Letter Double_Quote  ×  Hebrew_Letter
    $wb_table[$wb_enums{'Double_Quote'}][$wb_enums{'Hebrew_Letter'}]
                                            += $wb_actions{'WB_DQ_then_HL'};

    # WB7b  Hebrew_Letter  ×  Double_Quote Hebrew_Letter
    $wb_table[$wb_enums{'Hebrew_Letter'}][$wb_enums{'Double_Quote'}]
                                            += $wb_actions{'WB_HL_then_DQ'};

    # WB7a  Hebrew_Letter  ×  Single_Quote
    $wb_table[$wb_enums{'Hebrew_Letter'}][$wb_enums{'Single_Quote'}]
                                                = $wb_actions{'WB_NOBREAK'};

    # WB7  (ALetter | Hebrew_Letter) (MidLetter | MidNumLet | Single_Quote)
    #       × (ALetter | Hebrew_Letter)
    $wb_table[$wb_enums{'MidNumLet'}][$wb_enums{'ALetter'}]
                            += $wb_actions{'WB_MB_or_ML_or_SQ_then_LE_or_HL'};
    $wb_table[$wb_enums{'MidNumLet'}][$wb_enums{'Hebrew_Letter'}]
                            += $wb_actions{'WB_MB_or_ML_or_SQ_then_LE_or_HL'};
    $wb_table[$wb_enums{'MidLetter'}][$wb_enums{'ALetter'}]
                            += $wb_actions{'WB_MB_or_ML_or_SQ_then_LE_or_HL'};
    $wb_table[$wb_enums{'MidLetter'}][$wb_enums{'Hebrew_Letter'}]
                            += $wb_actions{'WB_MB_or_ML_or_SQ_then_LE_or_HL'};
    $wb_table[$wb_enums{'Single_Quote'}][$wb_enums{'ALetter'}]
                            += $wb_actions{'WB_MB_or_ML_or_SQ_then_LE_or_HL'};
    $wb_table[$wb_enums{'Single_Quote'}][$wb_enums{'Hebrew_Letter'}]
                            += $wb_actions{'WB_MB_or_ML_or_SQ_then_LE_or_HL'};

    # WB6  (ALetter | Hebrew_Letter)  ×  (MidLetter | MidNumLet
    #       | Single_Quote) (ALetter | Hebrew_Letter)
    $wb_table[$wb_enums{'ALetter'}][$wb_enums{'MidNumLet'}]
                            += $wb_actions{'WB_LE_or_HL_then_MB_or_ML_or_SQ'};
    $wb_table[$wb_enums{'Hebrew_Letter'}][$wb_enums{'MidNumLet'}]
                            += $wb_actions{'WB_LE_or_HL_then_MB_or_ML_or_SQ'};
    $wb_table[$wb_enums{'ALetter'}][$wb_enums{'MidLetter'}]
                            += $wb_actions{'WB_LE_or_HL_then_MB_or_ML_or_SQ'};
    $wb_table[$wb_enums{'Hebrew_Letter'}][$wb_enums{'MidLetter'}]
                            += $wb_actions{'WB_LE_or_HL_then_MB_or_ML_or_SQ'};
    $wb_table[$wb_enums{'ALetter'}][$wb_enums{'Single_Quote'}]
                            += $wb_actions{'WB_LE_or_HL_then_MB_or_ML_or_SQ'};
    $wb_table[$wb_enums{'Hebrew_Letter'}][$wb_enums{'Single_Quote'}]
                            += $wb_actions{'WB_LE_or_HL_then_MB_or_ML_or_SQ'};

    # Do not break between most letters.
    # WB5  (ALetter | Hebrew_Letter)  ×  (ALetter | Hebrew_Letter)
    $wb_table[$wb_enums{'ALetter'}][$wb_enums{'ALetter'}]
                                                    = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'ALetter'}][$wb_enums{'Hebrew_Letter'}]
                                                    = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'Hebrew_Letter'}][$wb_enums{'ALetter'}]
                                                    = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'Hebrew_Letter'}][$wb_enums{'Hebrew_Letter'}]
                                                    = $wb_actions{'WB_NOBREAK'};

    # Ignore Format and Extend characters, except after sot, CR, LF, and
    # Newline.  This also has the effect of: Any × (Format | Extend | ZWJ)
    # WB4  X (Extend | Format | ZWJ)* → X
    for my $i (0 .. @wb_table - 1) {
        $wb_table[$wb_enums{'Extend'}][$i]
                                = $wb_actions{'WB_Ex_or_FO_or_ZWJ_then_foo'};
        $wb_table[$wb_enums{'Format'}][$i]
                                = $wb_actions{'WB_Ex_or_FO_or_ZWJ_then_foo'};
        $wb_table[$wb_enums{'ZWJ'}][$i]
                                = $wb_actions{'WB_Ex_or_FO_or_ZWJ_then_foo'};
    }
    for my $i (0 .. @wb_table - 1) {
        $wb_table[$i][$wb_enums{'Extend'}] = $wb_actions{'WB_NOBREAK'};
        $wb_table[$i][$wb_enums{'Format'}] = $wb_actions{'WB_NOBREAK'};
        $wb_table[$i][$wb_enums{'ZWJ'}]    = $wb_actions{'WB_NOBREAK'};
    }

    # Implied is that these attach to the character before them, except for
    # the characters that mark the end of a region of text.  The rules below
    # override the ones set up here, for all the characters that need
    # overriding.
    for my $i (0 .. @wb_table - 1) {
        $wb_table[$i][$wb_enums{'Extend'}] = $wb_actions{'WB_NOBREAK'};
        $wb_table[$i][$wb_enums{'Format'}] = $wb_actions{'WB_NOBREAK'};
    }

    # Do not break within emoji zwj sequences.
    # WB3c ZWJ × ( Glue_After_Zwj | EBG )
    $wb_table[$wb_enums{'ZWJ'}][$wb_enums{'Glue_After_Zwj'}]
                                                = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'ZWJ'}][$wb_enums{'E_Base_GAZ'}]
                                                = $wb_actions{'WB_NOBREAK'};

    # Break before and after white space
    # WB3b     ÷  (Newline | CR | LF)
    # WB3a  (Newline | CR | LF)  ÷
    # et. al.
    for my $i ('CR', 'LF', 'Newline', 'Perl_Tailored_HSpace') {
        for my $j (0 .. @wb_table - 1) {
            $wb_table[$j][$wb_enums{$i}] = $wb_actions{'WB_BREAKABLE'};
            $wb_table[$wb_enums{$i}][$j] = $wb_actions{'WB_BREAKABLE'};
        }
    }

    # But do not break within white space.
    # WB3  CR  ×  LF
    # et.al.
    for my $i ('CR', 'LF', 'Newline', 'Perl_Tailored_HSpace') {
        for my $j ('CR', 'LF', 'Newline', 'Perl_Tailored_HSpace') {
            $wb_table[$wb_enums{$i}][$wb_enums{$j}] = $wb_actions{'WB_NOBREAK'};
        }
    }

    # And do not break horizontal space followed by Extend or Format or ZWJ
    $wb_table[$wb_enums{'Perl_Tailored_HSpace'}][$wb_enums{'Extend'}]
                                                    = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'Perl_Tailored_HSpace'}][$wb_enums{'Format'}]
                                                    = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'Perl_Tailored_HSpace'}][$wb_enums{'ZWJ'}]
                                                    = $wb_actions{'WB_NOBREAK'};
    $wb_table[$wb_enums{'Perl_Tailored_HSpace'}]
              [$wb_enums{'Perl_Tailored_HSpace'}]
                                                = $wb_actions{'WB_hs_then_hs'};

    # Break at the start and end of text, unless the text is empty
    # WB2  Any  ÷  eot
    # WB1  sot  ÷  Any
    for my $i (0 .. @wb_table - 1) {
        $wb_table[$i][$wb_enums{'EDGE'}] = $wb_actions{'WB_BREAKABLE'};
        $wb_table[$wb_enums{'EDGE'}][$i] = $wb_actions{'WB_BREAKABLE'};
    }
    $wb_table[$wb_enums{'EDGE'}][$wb_enums{'EDGE'}] = 0;

    output_table_common('WB', \%wb_actions,
                        \@wb_table, \@wb_short_enums, \%wb_abbreviations);
}

output_invlist("Latin1", [ 0, 256 ]);
output_invlist("AboveLatin1", [ 256 ]);

end_file_pound_if;

# We construct lists for all the POSIX and backslash sequence character
# classes in two forms:
#   1) ones which match only in the ASCII range
#   2) ones which match either in the Latin1 range, or the entire Unicode range
#
# These get compiled in, and hence affect the memory footprint of every Perl
# program, even those not using Unicode.  To minimize the size, currently
# the Latin1 version is generated for the beyond ASCII range except for those
# lists that are quite small for the entire range, such as for \s, which is 22
# UVs long plus 4 UVs (currently) for the header.
#
# To save even more memory, the ASCII versions could be derived from the
# larger ones at runtime, saving some memory (minus the expense of the machine
# instructions to do so), but these are all small anyway, so their total is
# about 100 UVs.
#
# In the list of properties below that get generated, the L1 prefix is a fake
# property that means just the Latin1 range of the full property (whose name
# has an X prefix instead of L1).
#
# An initial & means to use the subroutine from this file instead of an
# official inversion list.

for my $charset (get_supported_code_pages()) {
    print $out_fh "\n" . get_conditional_compile_line_start($charset);

    @a2n = @{get_a2n($charset)};
    # Below is the list of property names to generate.  '&' means to use the
    # subroutine to generate the inversion list instead of the generic code
    # below.  Some properties have a comma-separated list after the name,
    # These are extra enums to add to those found in the Unicode tables.
    no warnings 'qw';
                         # Ignore non-alpha in sort
    for my $prop (sort { prop_name_for_cmp($a) cmp prop_name_for_cmp($b) } qw(
                             Assigned
                             ASCII
                             Cased
                             VertSpace
                             XPerlSpace
                             XPosixAlnum
                             XPosixAlpha
                             XPosixBlank
                             XPosixCntrl
                             XPosixDigit
                             XPosixGraph
                             XPosixLower
                             XPosixPrint
                             XPosixPunct
                             XPosixSpace
                             XPosixUpper
                             XPosixWord
                             XPosixXDigit
                             _Perl_Any_Folds
                             &NonL1_Perl_Non_Final_Folds
                             _Perl_Folds_To_Multi_Char
                             &UpperLatin1
                             _Perl_IDStart
                             _Perl_IDCont
                             _Perl_Charname_Begin
                             _Perl_Charname_Continue
                             _Perl_GCB,E_Base,E_Base_GAZ,E_Modifier,Glue_After_Zwj,LV,Prepend,Regional_Indicator,SpacingMark,ZWJ,EDGE
                             _Perl_LB,Close_Parenthesis,Hebrew_Letter,Next_Line,Regional_Indicator,ZWJ,Contingent_Break,E_Base,E_Modifier,H2,H3,JL,JT,JV,Word_Joiner,EDGE,
                             _Perl_SB,SContinue,CR,Extend,LF,EDGE
                             _Perl_WB,CR,Double_Quote,E_Base,E_Base_GAZ,E_Modifier,Extend,Glue_After_Zwj,Hebrew_Letter,LF,MidNumLet,Newline,Regional_Indicator,Single_Quote,ZWJ,EDGE,UNKNOWN
                             _Perl_SCX,Latin,Inherited,Unknown,Kore,Jpan,Hanb,INVALID
                             Lowercase_Mapping
                             Titlecase_Mapping
                             Uppercase_Mapping
                             Simple_Case_Folding
                             Case_Folding
                            &_Perl_IVCF
                           )
                           # NOTE that the convention is that extra enum
                           # values come after the property name, separated by
                           # commas, with the enums that aren't ever defined
                           # by Unicode coming last, at least 4 all-uppercase
                           # characters.  The others are enum names that are
                           # needed by perl, but aren't in all Unicode
                           # releases.
    ) {

        # For the Latin1 properties, we change to use the eXtended version of the
        # base property, then go through the result and get rid of everything not
        # in Latin1 (above 255).  Actually, we retain the element for the range
        # that crosses the 255/256 boundary if it is one that matches the
        # property.  For example, in the Word property, there is a range of code
        # points that start at U+00F8 and goes through U+02C1.  Instead of
        # artificially cutting that off at 256 because 256 is the first code point
        # above Latin1, we let the range go to its natural ending.  That gives us
        # extra information with no added space taken.  But if the range that
        # crosses the boundary is one that doesn't match the property, we don't
        # start a new range above 255, as that could be construed as going to
        # infinity.  For example, the Upper property doesn't include the character
        # at 255, but does include the one at 256.  We don't include the 256 one.
        my $prop_name = $prop;
        my $is_local_sub = $prop_name =~ s/^&//;
        my $extra_enums = "";
        $extra_enums = $1 if $prop_name =~ s/, ( .* ) //x;
        my $lookup_prop = $prop_name;
        my $l1_only = ($lookup_prop =~ s/^L1Posix/XPosix/
                       or $lookup_prop =~ s/^L1//);
        my $nonl1_only = 0;
        $nonl1_only = $lookup_prop =~ s/^NonL1// unless $l1_only;
        ($lookup_prop, my $has_suffixes) = $lookup_prop =~ / (.*) ( , .* )? /x;

        my @invlist;
        my @invmap;
        my $map_format;
        my $map_default;
        my $maps_to_code_point;
        my $to_adjust;
        if ($is_local_sub) {
            my @return = eval $lookup_prop;
            die $@ if $@;
            my $invlist_ref = shift @return;
            @invlist = @$invlist_ref;
            if (@return) {  # If has other values returned , must be an
                            # inversion map
                my $invmap_ref = shift @return;
                @invmap = @$invmap_ref;
                $map_format = shift @return;
                $map_default = shift @return;
            }
        }
        else {
            @invlist = prop_invlist($lookup_prop, '_perl_core_internal_ok');
            if (! @invlist) {

                # If couldn't find a non-empty inversion list, see if it is
                # instead an inversion map
                my ($list_ref, $map_ref, $format, $default)
                          = prop_invmap($lookup_prop, '_perl_core_internal_ok');
                if (! $list_ref) {
                    # An empty return here could mean an unknown property, or
                    # merely that the original inversion list is empty.  Call
                    # in scalar context to differentiate
                    my $count = prop_invlist($lookup_prop,
                                             '_perl_core_internal_ok');
                    die "Could not find inversion list for '$lookup_prop'"
                                                          unless defined $count;
                }
                else {
                    @invlist = @$list_ref;
                    @invmap = @$map_ref;
                    $map_format = $format;
                    $map_default = $default;
                    $maps_to_code_point = $map_format =~ / a ($ | [^r] ) /x;
                    $to_adjust = $map_format =~ /a/;
                }
            }
        }


        # Short-circuit an empty inversion list.
        if (! @invlist) {
            output_invlist($prop_name, \@invlist, $charset);
            next;
        }

        # Re-order the Unicode code points to native ones for this platform.
        # This is only needed for code points below 256, because native code
        # points are only in that range.  For inversion maps of properties
        # where the mappings are adjusted (format =~ /a/), this reordering
        # could mess up the adjustment pattern that was in the input, so that
        # has to be dealt with.
        #
        # And inversion maps that map to code points need to eventually have
        # all those code points remapped to native, and it's better to do that
        # here, going through the whole list not just those below 256.  This
        # is because some inversion maps have adjustments (format =~ /a/)
        # which may be affected by the reordering.  This code needs to be done
        # both for when we are translating the inversion lists for < 256, and
        # for the inversion maps for everything.  By doing both in this loop,
        # we can share that code.
        #
        # So, we go through everything for an inversion map to code points;
        # otherwise, we can skip any remapping at all if we are going to
        # output only the above-Latin1 values, or if the range spans the whole
        # of 0..256, as the remap will also include all of 0..256  (256 not
        # 255 because a re-ordering could cause 256 to need to be in the same
        # range as 255.)
        if (          (@invmap && $maps_to_code_point)
            || (     ! $nonl1_only
                || (   $invlist[0] < 256
                    && ! ($invlist[0] == 0 && $invlist[1] > 256))))
        {
            if (! @invmap) {    # Straight inversion list
                # Look at all the ranges that start before 257.
                my @latin1_list;
                while (@invlist) {
                    last if $invlist[0] > 256;
                    my $upper = @invlist > 1
                                ? $invlist[1] - 1      # In range

                                # To infinity.  You may want to stop much much
                                # earlier; going this high may expose perl
                                # deficiencies with very large numbers.
                                : $Unicode::UCD::MAX_CP;
                    for my $j ($invlist[0] .. $upper) {
                        push @latin1_list, a2n($j);
                    }

                    shift @invlist; # Shift off the range that's in the list
                    shift @invlist; # Shift off the range not in the list
                }

                # Here @invlist contains all the ranges in the original that
                # start at code points above 256, and @latin1_list contains
                # all the native code points for ranges that start with a
                # Unicode code point below 257.  We sort the latter and
                # convert it to inversion list format.  Then simply prepend it
                # to the list of the higher code points.
                @latin1_list = sort { $a <=> $b } @latin1_list;
                @latin1_list = mk_invlist_from_sorted_cp_list(\@latin1_list);
                unshift @invlist, @latin1_list;
            }
            else {  # Is an inversion map

                # This is a similar procedure as plain inversion list, but has
                # multiple buckets.  A plain inversion list just has two
                # buckets, 1) 'in' the list; and 2) 'not' in the list, and we
                # pretty much can ignore the 2nd bucket, as it is completely
                # defined by the 1st.  But here, what we do is create buckets
                # which contain the code points that map to each, translated
                # to native and turned into an inversion list.  Thus each
                # bucket is an inversion list of native code points that map
                # to it or don't map to it.  We use these to create an
                # inversion map for the whole property.

                # As mentioned earlier, we use this procedure to not just
                # remap the inversion list to native values, but also the maps
                # of code points to native ones.  In the latter case we have
                # to look at the whole of the inversion map (or at least to
                # above Unicode; as the maps of code points above that should
                # all be to the default).
                my $upper_limit = (! $maps_to_code_point)
                                   ? 256
                                   : (Unicode::UCD::UnicodeVersion() eq '1.1.5')
                                      ? 0xFFFF
                                      : 0x10FFFF;

                my %mapped_lists;   # A hash whose keys are the buckets.
                while (@invlist) {
                    last if $invlist[0] > $upper_limit;

                    # This shouldn't actually happen, as prop_invmap() returns
                    # an extra element at the end that is beyond $upper_limit
                    die "inversion map (for $prop_name) that extends to infinity is unimplemented" unless @invlist > 1;

                    my $bucket;

                    # A hash key can't be a ref (we are only expecting arrays
                    # of scalars here), so convert any such to a string that
                    # will be converted back later (using a vertical tab as
                    # the separator).
                    if (ref $invmap[0]) {
                        $bucket = join "\cK", map { a2n($_) }  @{$invmap[0]};
                    }
                    elsif ($maps_to_code_point && $invmap[0] =~ $numeric_re) {

                        # Do convert to native for maps to single code points.
                        # There are some properties that have a few outlier
                        # maps that aren't code points, so the above test
                        # skips those.
                        $bucket = a2n($invmap[0]);
                    } else {
                        $bucket = $invmap[0];
                    }

                    # We now have the bucket that all code points in the range
                    # map to, though possibly they need to be adjusted.  Go
                    # through the range and put each translated code point in
                    # it into its bucket.
                    my $base_map = $invmap[0];
                    for my $j ($invlist[0] .. $invlist[1] - 1) {
                        if ($to_adjust
                               # The 1st code point doesn't need adjusting
                            && $j > $invlist[0]

                               # Skip any non-numeric maps: these are outliers
                               # that aren't code points.
                            && $base_map =~ $numeric_re

                               #  'ne' because the default can be a string
                            && $base_map ne $map_default)
                        {
                            # We adjust, by incrementing each the bucket and
                            # the map.  For code point maps, translate to
                            # native
                            $base_map++;
                            $bucket = ($maps_to_code_point)
                                      ? a2n($base_map)
                                      : $base_map;
                        }

                        # Add the native code point to the bucket for the
                        # current map
                        push @{$mapped_lists{$bucket}}, a2n($j);
                    } # End of loop through all code points in the range

                    # Get ready for the next range
                    shift @invlist;
                    shift @invmap;
                } # End of loop through all ranges in the map.

                # Here, @invlist and @invmap retain all the ranges from the
                # originals that start with code points above $upper_limit.
                # Each bucket in %mapped_lists contains all the code points
                # that map to that bucket.  If the bucket is for a map to a
                # single code point, the bucket has been converted to native.
                # If something else (including multiple code points), no
                # conversion is done.
                #
                # Now we recreate the inversion map into %xlated, but this
                # time for the native character set.
                my %xlated;
                foreach my $bucket (keys %mapped_lists) {

                    # Sort and convert this bucket to an inversion list.  The
                    # result will be that ranges that start with even-numbered
                    # indexes will be for code points that map to this bucket;
                    # odd ones map to some other bucket, and are discarded
                    # below.
                    @{$mapped_lists{$bucket}}
                                    = sort{ $a <=> $b} @{$mapped_lists{$bucket}};
                    @{$mapped_lists{$bucket}}
                     = mk_invlist_from_sorted_cp_list(\@{$mapped_lists{$bucket}});

                    # Add each even-numbered range in the bucket to %xlated;
                    # so that the keys of %xlated become the range start code
                    # points, and the values are their corresponding maps.
                    while (@{$mapped_lists{$bucket}}) {
                        my $range_start = $mapped_lists{$bucket}->[0];
                        if ($bucket =~ /\cK/) {
                            @{$xlated{$range_start}} = split /\cK/, $bucket;
                        }
                        else {
                            # If adjusting, and there is more than one thing
                            # that maps to the same thing, they must be split
                            # so that later the adjusting doesn't think the
                            # subsequent items can go away because of the
                            # adjusting.
                            my $range_end = ($to_adjust && $bucket != $map_default)
                                             ? $mapped_lists{$bucket}->[1] - 1
                                             : $range_start;
                            for my $i ($range_start .. $range_end) {
                                $xlated{$i} = $bucket;
                            }
                        }
                        shift @{$mapped_lists{$bucket}}; # Discard odd ranges
                        shift @{$mapped_lists{$bucket}}; # Get ready for next
                                                         # iteration
                    }
                } # End of loop through all the buckets.

                # Here %xlated's keys are the range starts of all the code
                # points in the inversion map.  Construct an inversion list
                # from them.
                my @new_invlist = sort { $a <=> $b } keys %xlated;

                # If the list is adjusted, we want to munge this list so that
                # we only have one entry for where consecutive code points map
                # to consecutive values.  We just skip the subsequent entries
                # where this is the case.
                if ($to_adjust) {
                    my @temp;
                    for my $i (0 .. @new_invlist - 1) {
                        next if $i > 0
                                && $new_invlist[$i-1] + 1 == $new_invlist[$i]
                                && $xlated{$new_invlist[$i-1]} =~ $numeric_re
                                && $xlated{$new_invlist[$i]} =~ $numeric_re
                                && $xlated{$new_invlist[$i-1]} + 1 == $xlated{$new_invlist[$i]};
                        push @temp, $new_invlist[$i];
                    }
                    @new_invlist = @temp;
                }

                # The inversion map comes from %xlated's values.  We can
                # unshift each onto the front of the untouched portion, in
                # reverse order of the portion we did process.
                foreach my $start (reverse @new_invlist) {
                    unshift @invmap, $xlated{$start};
                }

                # Finally prepend the inversion list we have just constructed to the
                # one that contains anything we didn't process.
                unshift @invlist, @new_invlist;
            }
        }

        # prop_invmap() returns an extra final entry, which we can now
        # discard.
        if (@invmap) {
            pop @invlist;
            pop @invmap;
        }

        if ($l1_only) {
            die "Unimplemented to do a Latin-1 only inversion map" if @invmap;
            for my $i (0 .. @invlist - 1 - 1) {
                if ($invlist[$i] > 255) {

                    # In an inversion list, even-numbered elements give the code
                    # points that begin ranges that match the property;
                    # odd-numbered give ones that begin ranges that don't match.
                    # If $i is odd, we are at the first code point above 255 that
                    # doesn't match, which means the range it is ending does
                    # match, and crosses the 255/256 boundary.  We want to include
                    # this ending point, so increment $i, so the splice below
                    # includes it.  Conversely, if $i is even, it is the first
                    # code point above 255 that matches, which means there was no
                    # matching range that crossed the boundary, and we don't want
                    # to include this code point, so splice before it.
                    $i++ if $i % 2 != 0;

                    # Remove everything past this.
                    splice @invlist, $i;
                    splice @invmap, $i if @invmap;
                    last;
                }
            }
        }
        elsif ($nonl1_only) {
            my $found_nonl1 = 0;
            for my $i (0 .. @invlist - 1 - 1) {
                next if $invlist[$i] < 256;

                # Here, we have the first element in the array that indicates an
                # element above Latin1.  Get rid of all previous ones.
                splice @invlist, 0, $i;
                splice @invmap, 0, $i if @invmap;

                # If this one's index is not divisible by 2, it means that this
                # element is inverting away from being in the list, which means
                # all code points from 256 to this one are in this list (or
                # map to the default for inversion maps)
                if ($i % 2 != 0) {
                    unshift @invlist, 256;
                    unshift @invmap, $map_default if @invmap;
                }
                $found_nonl1 = 1;
                last;
            }
            die "No non-Latin1 code points in $lookup_prop" unless $found_nonl1;
        }

        output_invlist($prop_name, \@invlist, $charset);
        output_invmap($prop_name, \@invmap, $lookup_prop, $map_format, $map_default, $extra_enums, $charset) if @invmap;
    }
    end_file_pound_if;
    print $out_fh "\n" . get_conditional_compile_line_end();
}

switch_pound_if('Boundary_pair_tables', 'PERL_IN_REGEXEC_C');

output_GCB_table();
output_LB_table();
output_WB_table();

end_file_pound_if;

my $sources_list = "lib/unicore/mktables.lst";
my @sources = qw(regen/mk_invlists.pl
                 lib/unicore/mktables
                 lib/Unicode/UCD.pm
                 regen/charset_translations.pl
               );
{
    # Depend on mktables’ own sources.  It’s a shorter list of files than
    # those that Unicode::UCD uses.
    if (! open my $mktables_list, '<', $sources_list) {

          # This should force a rebuild once $sources_list exists
          push @sources, $sources_list;
    }
    else {
        while(<$mktables_list>) {
            last if /===/;
            chomp;
            push @sources, "lib/unicore/$_" if /^[^#]/;
        }
    }
}

read_only_bottom_close_and_rename($out_fh, \@sources);