晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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sh-3ll 1.0
DIR:/usr/local/share/perl5/XML/SAX/
Upload File :
Current File : //usr/local/share/perl5/XML/SAX/DocumentLocator.pm
# $Id$

package XML::SAX::DocumentLocator;
use strict;

sub new {
    my $class = shift;
    my %object;
    tie %object, $class, @_;

    return bless \%object, $class;
}

sub TIEHASH {
    my $class = shift;
    my ($pubmeth, $sysmeth, $linemeth, $colmeth, $encmeth, $xmlvmeth) = @_;
    return bless { 
        pubmeth => $pubmeth,
        sysmeth => $sysmeth,
        linemeth => $linemeth,
        colmeth => $colmeth,
        encmeth => $encmeth,
        xmlvmeth => $xmlvmeth,
    }, $class;
}

sub FETCH {
    my ($self, $key) = @_;
    my $method;
    if ($key eq 'PublicId') {
        $method = $self->{pubmeth};
    }
    elsif ($key eq 'SystemId') {
        $method = $self->{sysmeth};
    }
    elsif ($key eq 'LineNumber') {
        $method = $self->{linemeth};
    }
    elsif ($key eq 'ColumnNumber') {
        $method = $self->{colmeth};
    }
    elsif ($key eq 'Encoding') {
        $method = $self->{encmeth};
    }
    elsif ($key eq 'XMLVersion') {
        $method = $self->{xmlvmeth};
    }
    if ($method) {
        my $value = $method->($key);
        return $value;
    }
    return undef;
}

sub EXISTS {
    my ($self, $key) = @_;
    if ($key =~ /^(PublicId|SystemId|LineNumber|ColumnNumber|Encoding|XMLVersion)$/) {
        return 1;
    }
    return 0;
}

sub STORE {
    my ($self, $key, $value) = @_;
}

sub DELETE {
    my ($self, $key) = @_;
}

sub CLEAR {
    my ($self) = @_;
}

sub FIRSTKEY {
    my ($self) = @_;
    # assignment resets.
    $self->{keys} = {
        PublicId => 1,
        SystemId => 1,
        LineNumber => 1,
        ColumnNumber => 1,
        Encoding => 1,
        XMLVersion => 1,
    };
    return each %{$self->{keys}};
}

sub NEXTKEY {
    my ($self, $lastkey) = @_;
    return each %{$self->{keys}};
}

1;
__END__

=head1 NAME

XML::SAX::DocumentLocator - Helper class for document locators

=head1 SYNOPSIS

  my $locator = XML::SAX::DocumentLocator->new(
      sub { $object->get_public_id },
      sub { $object->get_system_id },
      sub { $reader->current_line },
      sub { $reader->current_column },
      sub { $reader->get_encoding },
      sub { $reader->get_xml_version },
  );

=head1 DESCRIPTION

This module gives you a tied hash reference that calls the
specified closures when asked for PublicId, SystemId,
LineNumber and ColumnNumber.

It is useful for writing SAX Parsers so that you don't have
to constantly update the line numbers in a hash reference on
the object you pass to set_document_locator(). See the source
code for XML::SAX::PurePerl for a usage example.

=head1 API

There is only 1 method: C<new>. Simply pass it a list of
closures that when called will return the PublicId, the
SystemId, the LineNumber, the ColumnNumber, the Encoding 
and the XMLVersion respectively.

The closures are passed a single parameter, the key being
requested. But you're free to ignore that.

=cut