tools/perl-5.8.0/lib/5.8.0/utf8_heavy.pl

package utf8;
use strict;
use warnings;

sub DEBUG () { 0 }

sub DESTROY {}

my %Cache;

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

##
## "SWASH" == "SWATCH HASH". A "swatch" is a swatch of the Unicode landscape
##

sub SWASHNEW {
    my ($class, $type, $list, $minbits, $none) = @_;
    local $^D = 0 if $^D;

    print STDERR "SWASHNEW @_\n" if DEBUG;

    ##
    ## Get the list of codepoints for the type.
    ## Called from utf8.c
    ##
    ## Given a $type, our goal is to fill $list with the set of codepoint
    ## ranges.
    ##
    ## To make the parsing of $type clear, this code takes the a rather
    ## unorthadox approach of last'ing out of the block once we have the
    ## info we need. Were this to be a subroutine, the 'last' would just
    ## be a 'return'.
    ##
    my $file; ## file to load data from, and also part of the %Cache key.
    my $ListSorted = 0;

    if ($type)
    {
        $type =~ s/^\s+//;
        $type =~ s/\s+$//;

        print "type = $type\n" if DEBUG;

      GETFILE:
        {
            ##
            ## 'Is' is always optional, so if it's there, remove it.
            ## Same with 'Category=' and 'Script='.
            ##
            ## 'Block=' is replaced by 'In'.
            ##
            $type =~ s/^Is(?:\s+|[-_])?//i
              or
            $type =~ s/^Category\s*=\s*//i
              or
            $type =~ s/^Script\s*=\s*//i
              or
            $type =~ s/^Block\s*=\s*/In/i;

            ##
            ## See if it's in the direct mapping table.
            ##
            require "unicore/Exact.pl";
            if (my $base = $utf8::Exact{$type}) {
                $file = "unicore/lib/$base.pl";
                last GETFILE;
            }

            ##
            ## If not there exactly, try the canonical form. The canonical
            ## form is lowercased, with any separators (\s+|[-_]) removed.
            ##
            my $canonical = lc $type;
            $canonical =~ s/(?<=[a-z\d])(?:\s+|[-_])(?=[a-z\d])//g;
            print "canonical = $canonical\n" if DEBUG;

            require "unicore/Canonical.pl";
            if (my $base = $utf8::Canonical{$canonical}) {
                $file = "unicore/lib/$base.pl";
                last GETFILE;
            }

            ##
            ## It could be a user-defined property.
            ##

            if ($type =~ /^I[ns](\w+)$/) {
                my @caller = caller(1);

                if (defined $caller[0]) {
                    my $prop = $caller[0] . "::" . $type;

                    if (exists &{$prop}) {
                        no strict 'refs';

                        $list = &{$prop};
                        last GETFILE;
                    }
                }
            }

            ##
            ## Last attempt -- see if it's a "To" name (e.g. "ToLower")
            ##
            if ($type =~ /^To([A-Z][A-Za-z]+)$/)
            {
                $file = "unicore/To/$1.pl";
                ## would like to test to see if $file actually exists....
                last GETFILE;
            }

            ##
            ## If we reach this line, it's because we couldn't figure
            ## out what to do with $type. Ouch.
            ##

            return $type;
        }

        if (defined $file) {
            print "found it (file='$file')\n" if DEBUG;

            ##
            ## If we reach here, it was due to a 'last GETFILE' above
            ## (exception: user-defined properties), so we
            ## have a filename, so now we load it if we haven't already.
            ## If we have, return the cached results. The cache key is the
            ## file to load.
            ##
            if ($Cache{$file} and ref($Cache{$file}) eq $class)
            {
                print "Returning cached '$file' for \\p{$type}\n" if DEBUG;
                return $Cache{$class, $file};
            }

            $list = do $file;
        }

        $ListSorted = 1; ## we know that these lists are sorted
    }

    my $extras;
    my $bits;

    my $ORIG = $list;
    if ($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 $subobj;
                if ($c eq 'utf8') {
                    $subobj = $c->SWASHNEW($t, "", 0, 0, 0);
                }
                elsif ($c =~ /^([0-9a-fA-F]+)/) {
                    $subobj = utf8->SWASHNEW("", $c, 0, 0, 0);
                }
                return $subobj unless ref $subobj;
                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;

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

    if ($file) {
        $Cache{$class, $file} = $SWASH;
    }

    return $SWASH;
}

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

sub SWASHGET {
    # See utf8.c:Perl_swash_fetch for problems with this interface.
    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 $val\n" if DEBUG;
                if ($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;