html.pm

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

      } elsif ($tagname eq 'item-text' or $tagname =~ m/^head\d$/s) {
        print $fh $tagmap->{$tagname} || next;

        my @to_unget;
        while(1) {
          push @to_unget, $self->get_token;
          last if $to_unget[-1]->is_end
              and $to_unget[-1]->tagname eq $tagname;
          
          # TODO: support for X<...>'s found in here?  (maybe hack into linearize_tokens)
        }

        my $name = $self->linearize_tokens(@to_unget);
        
        print $fh "<a ";
        print $fh "class='u' href='#___top' title='click to go to top of document'\n"
         if $tagname =~ m/^head\d$/s;
        
        if(defined $name) {
          my $esc = esc(  $self->section_name_tidy( $name ) );
          print $fh qq[name="$esc"];
          DEBUG and print "Linearized ", scalar(@to_unget),
           " tokens as \"$name\".\n";
          push @{ $self->{'PSHTML_index_points'} }, [$tagname, $name]
           if $ToIndex{ $tagname };
            # Obviously, this discards all formatting codes (saving
            #  just their content), but ahwell.
           
        } else {  # ludicrously long, so nevermind
          DEBUG and print "Linearized ", scalar(@to_unget),
           " tokens, but it was too long, so nevermind.\n";
        }
        print $fh "\n>";
        $self->unget_token(@to_unget);

      } elsif ($tagname eq 'Data') {
        my $next = $self->get_token;
        next unless defined $next;
        unless( $next->type eq 'text' ) {
          $self->unget_token($next);
          next;
        }
        DEBUG and print "    raw text ", $next->text, "\n";
        printf $fh "\n" . $next->text . "\n";
        next;
       
      } else {
        if( $tagname =~ m/^over-/s ) {
          push @stack, '';
        } elsif( $tagname =~ m/^item-/s and @stack and $stack[-1] ) {
          print $fh $stack[-1];
          $stack[-1] = '';
        }
        print $fh $tagmap->{$tagname} || next;
        ++$dont_wrap if $tagname eq 'Verbatim' or $tagname eq "VerbatimFormatted"
          or $tagname eq 'X';
      }

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    } elsif( $type eq 'end' ) {
      if( ($tagname = $token->tagname) =~ m/^over-/s ) {
        if( my $end = pop @stack ) {
          print $fh $end;
        }
      } elsif( $tagname =~ m/^item-/s and @stack) {
        $stack[-1] = $tagmap->{"/$tagname"};
        if( $tagname eq 'item-text' and defined(my $next = $self->get_token) ) {
          $self->unget_token($next);
          if( $next->type eq 'start' and $next->tagname !~ m/^item-/s ) {
            print $fh $tagmap->{"/item-text"},$tagmap->{"item-body"};
            $stack[-1] = $tagmap->{"/item-body"};
          }
        }
        next;
      }
      print $fh $tagmap->{"/$tagname"} || next;
      --$dont_wrap if $tagname eq 'Verbatim' or $tagname eq 'X';

    # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    } elsif( $type eq 'text' ) {
      esc($type = $token->text);  # reuse $type, why not
      $type =~ s/([\?\!\"\'\.\,]) /$1\n/g unless $dont_wrap;
      print $fh $type;
    }

  }
  return 1;
}

###########################################################################
#

sub do_link {
  my($self, $token) = @_;
  my $type = $token->attr('type');
  if(!defined $type) {
    $self->whine("Typeless L!?", $token->attr('start_line'));
  } elsif( $type eq 'pod') { return $self->do_pod_link($token);
  } elsif( $type eq 'url') { return $self->do_url_link($token);
  } elsif( $type eq 'man') { return $self->do_man_link($token);
  } else {
    $self->whine("L of unknown type $type!?", $token->attr('start_line'));
  }
  return 'FNORG'; # should never get called
}

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

sub do_url_link { return $_[1]->attr('to') }

sub do_man_link { return undef }
 # But subclasses are welcome to override this if they have man
 #  pages somewhere URL-accessible.


sub do_pod_link {
  # And now things get really messy...
  my($self, $link) = @_;
  my $to = $link->attr('to');
  my $section = $link->attr('section');
  return undef unless(  # should never happen
    (defined $to and length $to) or
    (defined $section and length $section)
  );

  $section = $self->section_escape($section)
   if defined $section and length($section .= ''); # (stringify)

  DEBUG and printf "Resolving \"%s\" \"%s\"...\n",
   $to || "(nil)",  $section || "(nil)";
   
  {
    # An early hack:
    my $complete_url = $self->resolve_pod_link_by_table($to, $section);
    if( $complete_url ) {
      DEBUG > 1 and print "resolve_pod_link_by_table(T,S) gives ",
        $complete_url, "\n  (Returning that.)\n";
      return $complete_url;
    } else {
      DEBUG > 4 and print " resolve_pod_link_by_table(T,S)", 
       " didn't return anything interesting.\n";
    }
  }

  if(defined $to and length $to) {
    # Give this routine first hack again
    my $there = $self->resolve_pod_link_by_table($to);
    if(defined $there and length $there) {
      DEBUG > 1
       and print "resolve_pod_link_by_table(T) gives $there\n";
    } else {
      $there = 
        $self->resolve_pod_page_link($to, $section);
         # (I pass it the section value, but I don't see a
         #  particular reason it'd use it.)
      DEBUG > 1 and print "resolve_pod_page_link gives ", $to || "(nil)", "\n";
      unless( defined $there and length $there ) {
        DEBUG and print "Can't resolve $to\n";
        return undef;
      }
      # resolve_pod_page_link returning undef is how it
      #  can signal that it gives up on making a link
    }
    $to = $there;
  }

  #DEBUG and print "So far [", $to||'nil', "] [", $section||'nil', "]\n";

  my $out = (defined $to and length $to) ? $to : '';
  $out .= "#" . $section if defined $section and length $section;
  
  unless(length $out) { # sanity check
    DEBUG and printf "Oddly, couldn't resolve \"%s\" \"%s\"...\n",
     $to || "(nil)",  $section || "(nil)";
    return undef;
  }

  DEBUG and print "Resolved to $out\n";
  return $out;  
}


# . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

sub section_escape {
  my($self, $section) = @_;
  return $self->section_url_escape(
    $self->section_name_tidy($section)
  );
}

sub section_name_tidy {
  my($self, $section) = @_;
  $section =~ tr/ /_/;
  $section =~ tr/\x00-\x1F\x80-\x9F//d if 'A' eq chr(65); # drop crazy characters
  $section = $self->unicode_escape_url($section);
  $section = '_' unless length $section;
  return $section;
}

sub section_url_escape  { shift->general_url_escape(@_) }
sub pagepath_url_escape { shift->general_url_escape(@_) }

sub general_url_escape {
  my($self, $string) = @_;
 
  $string =~ s/([^\x00-\xFF])/join '', map sprintf('%%%02X',$_), unpack 'C*', $1/eg;
     # express Unicode things as urlencode(utf(orig)).
  
  # A pretty conservative escaping, behoovey even for query components
  #  of a URL (see RFC 2396)
  
  $string =~ s/([^-_\.!~*()abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789])/sprintf('%%%02X',ord($1))/eg;
   # Yes, stipulate the list without a range, so that this can work right on
   #  all charsets that this module happens to run under.
   # Altho, hmm, what about that ord?  Presumably that won't work right
   #  under non-ASCII charsets.  Something should be done
   #  about that, I guess?
  
  return $string;
}

#--------------------------------------------------------------------------
#
# Oh look, a yawning portal to Hell!  Let's play touch football right by it!
#

sub resolve_pod_page_link {
  # resolve_pod_page_link must return a properly escaped URL
  my $self = shift;
  return $self->batch_mode()
   ? $self->resolve_pod_page_link_batch_mode(@_)
   : $self->resolve_pod_page_link_singleton_mode(@_)
  ;
}

sub resolve_pod_page_link_singleton_mode {
  my($self, $it) = @_;
  return undef unless defined $it and length $it;
  my $url = $self->pagepath_url_escape($it);
  
  $url =~ s{::$}{}s; # probably never comes up anyway
  $url =~ s{::}{/}g unless $self->perldoc_url_prefix =~ m/\?/s; # sane DWIM?
  
  return undef unless length $url;
  return $self->perldoc_url_prefix . $url . $self->perldoc_url_postfix;
}

sub resolve_pod_page_link_batch_mode {
  my($self, $to) = @_;
  DEBUG > 1 and print " During batch mode, resolving $to ...\n";
  my @path = grep length($_), split m/::/s, $to, -1;
  unless( @path ) { # sanity
    DEBUG and print "Very odd!  Splitting $to gives (nil)!\n";
    return undef;
  }
  $self->batch_mode_rectify_path(\@path);
  my $out = join('/', map $self->pagepath_url_escape($_), @path)
    . $HTML_EXTENSION;
  DEBUG > 1 and print " => $out\n";
  return $out;
}

sub batch_mode_rectify_path {
  my($self, $pathbits) = @_;
  my $level = $self->batch_mode_current_level;
  $level--; # how many levels up to go to get to the root
  if($level < 1) {
    unshift @$pathbits, '.'; # just to be pretty
  } else {
    unshift @$pathbits, ('..') x $level;
  }
  return;
}

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

sub resolve_pod_link_by_table {
  # A crazy hack to allow specifying custom L<foo> => URL mappings

  return unless $_[0]->{'podhtml_LOT'};  # An optimizy shortcut

  my($self, $to, $section) = @_;

  # TODO: add a method that actually populates podhtml_LOT from a file?

  if(defined $section) {
    $to = '' unless defined $to and length $to;
    return $self->{'podhtml_LOT'}{"$to#$section"}; # quite possibly undef!
  } else {
    return $self->{'podhtml_LOT'}{$to};            # quite possibly undef!
  }
  return;
}

###########################################################################

sub linearize_tokens {  # self, tokens
  my $self = shift;
  my $out = '';
  
  my $t;
  while($t = shift @_) {
    if(!ref $t or !UNIVERSAL::can($t, 'is_text')) {
      $out .= $t; # a string, or some insane thing
    } elsif($t->is_text) {
      $out .= $t->text;
    } elsif($t->is_start and $t->tag eq 'X') {
      # Ignore until the end of this X<...> sequence:
      my $x_open = 1;
      while($x_open) {
        next if( ($t = shift @_)->is_text );
        if(   $t->is_start and $t->tag eq 'X') { ++$x_open }
        elsif($t->is_end   and $t->tag eq 'X') { --$x_open }
      }
    }
  }
  return undef if length $out > $Linearization_Limit;
  return $out;
}

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

sub unicode_escape_url {
  my($self, $string) = @_;
  $string =~ s/([^\x00-\xFF])/'('.ord($1).')'/eg;
    #  Turn char 1234 into "(1234)"
  return $string;
}

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sub esc { # a function.
  if(defined wantarray) {
    if(wantarray) {
      @_ = splice @_; # break aliasing
    } else {
      my $x = shift;
      $x =~ s/([^-\n\t !\#\$\%\(\)\*\+,\.\~\/\:\;=\?\@\[\\\]\^_\`\{\|\}abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789])/'&#'.(ord($1)).';'/eg;
      return $x;
    }
  }
  foreach my $x (@_) {
    # Escape things very cautiously:
    $x =~ s/([^-\n\t !\#\$\%\(\)\*\+,\.\~\/\:\;=\?\@\[\\\]\^_\`\{\|\}abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789])/'&#'.(ord($1)).';'/eg
     if defined $x;
    # Leave out "- so that "--" won't make it thru in X-generated comments
    #  with text in them.

    # Yes, stipulate the list without a range, so that this can work right on
    #  all charsets that this module happens to run under.
    # Altho, hmm, what about that ord?  Presumably that won't work right
    #  under non-ASCII charsets.  Something should be done about that.
  }
  return @_;
}

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1;
__END__

=head1 NAME

Pod::Simple::HTML - convert Pod to HTML

=head1 SYNOPSIS

  perl -MPod::Simple::HTML -e Pod::Simple::HTML::go thingy.pod


=head1 DESCRIPTION

This class is for making an HTML rendering of a Pod document.

This is a subclass of L<Pod::Simple::PullParser> and inherits all its
methods (and options).

Note that if you want to do a batch conversion of a lot of Pod
documents to HTML, you should see the module L<Pod::Simple::HTMLBatch>.



=head1 CALLING FROM THE COMMAND LINE

TODO

  perl -MPod::Simple::HTML -e Pod::Simple::HTML::go Thing.pod Thing.html



=head1 CALLING FROM PERL

TODO   make a new object, set any options, and use parse_from_file


=head1 METHODS

TODO
all (most?) accessorized methods


=head1 SUBCLASSING

TODO

 can just set any of:  html_css html_javascript title_prefix
  'html_header_before_title',
  'html_header_after_title',
  'html_footer',

maybe override do_pod_link

maybe override do_beginning do_end



=head1 SEE ALSO

L<Pod::Simple>, L<Pod::Simple::HTMLBatch>


TODO: a corpus of sample Pod input and HTML output?  Or common
idioms?



=head1 COPYRIGHT AND DISCLAIMERS

Copyright (c) 2002-2004 Sean M. Burke.  All rights reserved.

This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

This program is distributed in the hope that it will be useful, but
without any warranty; without even the implied warranty of
merchantability or fitness for a particular purpose.

=head1 AUTHOR

Sean M. Burke C<[e-mail]>

=cut