source: trunk/third/perl/lib/utf8_heavy.pl @ 14545

package utf8;

my $DEBUG = 0;
my $seq = "AAA0000";

sub DESTROY {}

sub croak { require Carp; Carp::croak(@_) }

sub SWASHNEW {
    my ($class, $type, $list, $minbits, $none) = @_;
    local $^D = 0 if $^D;
    print STDERR "SWASHNEW @_\n" if $DEBUG;
    my $extras;
    my $bits;
 
    if ($type and ref ${"${class}::{$type}"} eq $class) {
        warn qq/Found \${"${class}::{$type}"}\n/ if $DEBUG;
        return ${"${class}::{$type}"};  # Already there...
    }

    $type ||= $seq++;

    my $caller;
    my $i = 0;
    while (($caller = caller($i)) eq __PACKAGE__) { $i++ }
    my $encoding = $enc{$caller} || "unicode";
    (my $file = $type) =~ s!::!/!g;
    $file =~ s#^(I[sn]|To)([A-Z].*)#$1/$2#;
    $list ||= eval { $caller->$type(); }
        || do "$file.pl"
        || do "$encoding/$file.pl"
        || do "$encoding/Is/${type}.pl"
        || croak("Can't find $encoding character property definition via $caller->$type or $file.pl");

    $| = 1;

    if ($list) {
        my @tmp = split(/^/m, $list);
        my %seen;
        no warnings;
        $extras = join '', grep /^[^0-9a-fA-F]/, @tmp;
        $list = join '',
            sort { hex $a <=> hex $b }
            grep {/^([0-9a-fA-F]+)/ and not $seen{$1}++} @tmp; # XXX doesn't do ranges right
    }

    if ($none) {
        my $hextra = sprintf "%04x", $none + 1;
        $list =~ s/\tXXXX$/\t$hextra/mg;
    }

    if ($minbits < 32) {
        my $top = 0;
        while ($list =~ /^([0-9a-fA-F]+)(?:\t([0-9a-fA-F]+)?)(?:\t([0-9a-fA-F]+))?/mg) {
            my $min = hex $1;
            my $max = hex(defined $2 ? $2 : $1);
            my $val = hex(defined $3 ? $3 : "");
            $val += $max - $min if defined $3;
            $top = $val if $val > $top;
        }
        $bits =
            $top > 0xffff ? 32 :
            $top > 0xff ? 16 :
            $top > 1 ? 8 : 1
    }
    $bits = $minbits if $bits < $minbits;

    my @extras;
    for my $x ($extras) {
        pos $x = 0;
        while ($x =~ /^([^0-9a-fA-F\n])(.*)/mg) {
            my $char = $1;
            my $name = $2;
            # print STDERR "$1 => $2\n" if $DEBUG;
            if ($char =~ /[-+!]/) {
                my ($c,$t) = split(/::/, $name, 2);     # bogus use of ::, really
                my $subobj = $c->SWASHNEW($t, "", 0, 0, 0);
                push @extras, $name => $subobj;
                $bits = $subobj->{BITS} if $bits < $subobj->{BITS};
            }
        }
    }

    print STDERR "CLASS = $class, TYPE => $type, BITS => $bits, NONE => $none\nEXTRAS =>\n$extras\nLIST =>\n$list\n" if $DEBUG;

    ${"${class}::{$type}"} = bless {
        TYPE => $type,
        BITS => $bits,
        EXTRAS => $extras,
        LIST => $list,
        NONE => $none,
        @extras,
    } => $class;
}

# NOTE: utf8.c:swash_init() assumes entries are never modified once generated.

sub SWASHGET {
    my ($self, $start, $len) = @_;
    local $^D = 0 if $^D;
    my $type = $self->{TYPE};
    my $bits = $self->{BITS};
    my $none = $self->{NONE};
    print STDERR "SWASHGET @_ [$type/$bits/$none]\n" if $DEBUG;
    my $end = $start + $len;
    my $swatch = "";
    my $key;
    vec($swatch, $len - 1, $bits) = 0;  # Extend to correct length.
    if ($none) {
        for $key (0 .. $len - 1) { vec($swatch, $key, $bits) = $none }
    }

    for ($self->{LIST}) {
        pos $_ = 0;
        if ($bits > 1) {
          LINE:
            while (/^([0-9a-fA-F]+)(?:\t([0-9a-fA-F]+)?)(?:\t([0-9a-fA-F]+))?/mg) {
                my $min = hex $1;
                my $max = (defined $2 ? hex $2 : $min);
                my $val = hex $3;
                next if $max < $start;
#               print "$min $max $val\n";
                if ($none) {
                    if ($min < $start) {
                        $val += $start - $min if $val < $none;
                        $min = $start;
                    }
                    for ($key = $min; $key <= $max; $key++) {
                        last LINE if $key >= $end;
#                       print STDERR "$key => $val\n" if $DEBUG;
                        vec($swatch, $key - $start, $bits) = $val;
                        ++$val if $val < $none;
                    }
                }
                else {
                    if ($min < $start) {
                        $val += $start - $min;
                        $min = $start;
                    }
                    for ($key = $min; $key <= $max; $key++, $val++) {
                        last LINE if $key >= $end;
#                       print STDERR "$key => $val\n" if $DEBUG;
                        vec($swatch, $key - $start, $bits) = $val;
                    }
                }
            }
        }
        else {
          LINE:
            while (/^([0-9a-fA-F]+)(?:\t([0-9a-fA-F]+))?/mg) {
                my $min = hex $1;
                my $max = (defined $2 ? hex $2 : $min);
                next if $max < $start;
                if ($min < $start) {
                    $min = $start;
                }
                for ($key = $min; $key <= $max; $key++) {
                    last LINE if $key >= $end;
#                   print STDERR "$key => 1\n" if $DEBUG;
                    vec($swatch, $key - $start, 1) = 1;
                }
            }
        }
    }
    for my $x ($self->{EXTRAS}) {
        pos $x = 0;
        while ($x =~ /^([-+!])(.*)/mg) {
            my $char = $1;
            my $name = $2;
            print STDERR "INDIRECT $1 $2\n" if $DEBUG;
            my $otherbits = $self->{$name}->{BITS};
            croak("SWASHGET size mismatch") if $bits < $otherbits;
            my $other = $self->{$name}->SWASHGET($start, $len);
            if ($char eq '+') {
                if ($bits == 1 and $otherbits == 1) {
                    $swatch |= $other;
                }
                else {
                    for ($key = 0; $key < $len; $key++) {
                        vec($swatch, $key, $bits) = vec($other, $key, $otherbits);
                    }
                }
            }
            elsif ($char eq '!') {
                if ($bits == 1 and $otherbits == 1) {
                    $swatch |= ~$other;
                }
                else {
                    for ($key = 0; $key < $len; $key++) {
                        if (!vec($other, $key, $otherbits)) {
                            vec($swatch, $key, $bits) = 1;
                        }
                    }
                }
            }
            elsif ($char eq '-') {
                if ($bits == 1 and $otherbits == 1) {
                    $swatch &= ~$other;
                }
                else {
                    for ($key = 0; $key < $len; $key++) {
                        if (vec($other, $key, $otherbits)) {
                            vec($swatch, $key, $bits) = 0;
                        }
                    }
                }
            }
        }
    }
    if ($DEBUG) {
        print STDERR "CELLS ";
        for ($key = 0; $key < $len; $key++) {
            print STDERR vec($swatch, $key, $bits), " ";
        }
        print STDERR "\n";
    }
    $swatch;
}

1;