#
# UTF2000.pm by Shigeki Moro
# $ld$
#
package UTF2000;

use strict;
use BerkeleyDB;

my $DB_HOME = '/usr/local/lib/xemacs-21.4.10/i686-pc-linux/char-db';

my %alias = ();
for (glob "$DB_HOME/system-char-id/*") {
  s/^.*\/([^\/]+)$/$1/;
  my $i = $_;
  s/\->/to_/;
  s/<\-/from_/;
  s/=>/map_/;
  s/\-/_/g;
  $alias{$_} = $i;
}
%alias = (
	  %alias,
	  'radical','ideographic-radical',
	  'strokes','ideographic-strokes',
);

#--------------------------------------------------------#

sub new {
  my $invocant = shift;
  my $class = ref($invocant) || $invocant;
  my $self  = { @_ };
  return bless $self, $class;
}

sub dumpAttr {
  my $self = shift;
  for my $i (keys %$self) {
    print "$i => $$self{$i}\n";
  }
}

sub addAttr {
  my $model = shift;
  my $self = $model->new(%$model, @_);
  return $self;
}

sub delAttr (@) {
  my $model = shift;
  delete $$model{$_} foreach (@_);
  my $self = $model->new(%$model);
  return $self;
}

# 
for my $attrname (keys %alias) {
  my $slot = __PACKAGE__ . "::$attrname";
  no strict "refs";
  *$slot = sub {
    my $self = shift;
    my @result;
    for my $i ($self->chars) {
      my $j = &getvalue("$DB_HOME/system-char-id/$alias{$attrname}", $i);
      push @result, $j if $j;
    }
    return @result;
  }
}

sub utf8 {
  # UTF-8ã‚’ø½Š²¿ã™
  my $self = shift;
  my @result;
  for my $i ($self->chars) {
    $i =~ s/^\?//;
    # To Do: ç§ç”¨ø½Š¸¯åŸŸã®ã¯ø½Š²¿ã•ãªã„ã‚ˆã†ã«ã—ãªã„ã¨ã€‚
    push @result, $i;
  }
  return @result;
}

#--------------------------------------------------------#

sub chars {
  # ?... ã‚’ø½Š²¿ã™
  my $self = shift;
  my @result = ('*');
  for my $attrname (keys %$self) {
    my @tmp = ();
    my $dbname = exists $alias{$attrname} ? $alias{$attrname} : $attrname;
    if (-f "$DB_HOME/$dbname/system-char-id") {
      @tmp = (&getvalue("$DB_HOME/$dbname/system-char-id", $$self{$attrname}));
      @result = &cap(\@result, \@tmp);
    } elsif (-f "$DB_HOME/system-char-id/$dbname") {
      @tmp = &getkeys("$DB_HOME/system-char-id/$dbname", $$self{$attrname});
      @result = &cap(\@result, \@tmp);
    } else {
      die "cannot find $attrname: $! $BerkeleyDB::Error\n";
    }
  }
  return @result;
}

sub getvalue ($$) {
  # ã‚­ãƒ¼ã‹ã‚‰å€¤ã‚’ø½Šž­ã‚Šå‡ºã™
  my($dbname, $key) = @_;
  tie my %h, "BerkeleyDB::Hash",
    -Filename => $dbname;
  my $value = $h{$key};
  untie %h;
  return $value;
}

sub getkeys ($$) {
  # å€¤ã‹ã‚‰ã‚­ãƒ¼ã®é…åˆ—ã‚’ø½Šž­ã‚Šå‡ºã™
  my($dbname, $value) = @_;
  tie my %h, "BerkeleyDB::Hash",
    -Filename => $dbname;
  my @keys = ();
  for my $key (keys %h) {
    push @keys, $key if ($h{$key} eq $value);
  }
  untie %h;
  return @keys;
}

sub cap {
  # 2ã¤ã®é…åˆ—ã®ç©ø½ŠŸ›åˆã‚’æ±‚ã‚ã‚‹
  my($a, $b) = @_;
  if (!@$a or !@$b) {
    return ();
  } elsif ($$a[0] eq '*') { # '*'ã¯å…¨ä½“ø½ŠŸ›åˆ
    return @$b;
  } elsif ($$b[0] eq '*') {
    return @$a;
  } else {
    my %result = ();
    my @result = ();
    for my $i (@$a, @$b) {
      $result{$i}++;
      push @result, $i if ($result{$i} == 2);
    }
    return @result;
    #return grep {
    #  my $c = $_;
    #  grep /^$c$/, @$b;
    #} @$a;
  }
}

#--------------------------------------------------------#
1;
