require 5;
package HTML::FormatRTF;
use strict;
use vars qw(@ISA $VERSION %Escape);

use HTML::Formatter ();
BEGIN { *DEBUG = \&HTML::Formatter::DEBUG unless defined &DEBUG }

@ISA = qw(HTML::Formatter);

$VERSION = sprintf("%d.%02d", q$Revision: 2.04 $ =~ /(\d+)\.(\d+)/);


sub default_values {
  (
     shift->SUPER::default_values(),
     'lm' =>  0, # left margin
     'rm' =>  0, # right margin (actually, maximum text width)

     'head1_halfpoint_size' => 32,
     'head2_halfpoint_size' => 28,
     'head3_halfpoint_size' => 25,
     'head4_halfpoint_size' => 22,
     'head5_halfpoint_size' => 20,
     'head6_halfpoint_size' => 18,
     'codeblock_halfpoint_size' => 18,
     'header_halfpoint_size' => 17,
     'normal_halfpoint_size' => 22,
  );
}

sub configure {
  my($self,$hash) = @_;
  $self->{lm} = 0;
  $self->{rm} = 0;
  $self;
}


sub begin {
  my $self = shift;
  DEBUG and print " Start document.\n";

  $self->SUPER::begin;

  $self->collect(
      $self->doc_init,
      $self->font_table,
      $self->stylesheet,
      $self->color_table,
      $self->doc_info,
      $self->doc_really_start,
      "\n"
  )
   unless $self->{'no_prolog'};
  
  $self->{'Para'} = '';
  $self->{'quotelevel'} = 0;
  
  return;
}

sub end {
  my $self = shift;
  $self->vspace(0);
  $self->out('THIS IS NEVER SEEN');
   # just to force the previous para to be written out.

  $self->collect("}") unless $self->{'no_trailer'}; # ends the document
  DEBUG and print " End document.\n";
  return;
}


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

sub vspace {
  my $self = shift;
  #$self->emit_para if defined $self->{'vspace'};
  my $rv = $self->SUPER::vspace(@_);
  $self->emit_para if defined $self->{'vspace'};
  $rv;
}

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

sub stylesheet {

  # TODO: maybe actually /use/ the character styles?

  return sprintf <<'END',     # snazzy styles
{\stylesheet
{\snext0 Normal;}
{\*\cs1 \additive Default Paragraph Font;}
{\*\cs2 \additive \i\sbasedon1 html-ital;}
{\*\cs3 \additive \b\sbasedon1 html-bold;}
{\*\cs4 \additive \f1\sbasedon1 html-code;}

{\s20\ql \f1\fs%s\lang1024\noproof\sbasedon0 \snext0 html-pre;}

{\s31\ql \keepn\sb90\sa180\f2\fs%s\ul\sbasedon0 \snext0 html-head1;}
{\s32\ql \keepn\sb90\sa180\f2\fs%s\ul\sbasedon0 \snext0 html-head2;}
{\s33\ql \keepn\sb90\sa180\f2\fs%s\ul\sbasedon0 \snext0 html-head3;}
{\s34\ql \keepn\sb90\sa180\f2\fs%s\ul\sbasedon0 \snext0 html-head4;}
{\s35\ql \keepn\sb90\sa180\f2\fs%s\ul\sbasedon0 \snext0 html-head5;}
{\s36\ql \keepn\sb90\sa180\f2\fs%s\ul\sbasedon0 \snext0 html-head6;}
}

END

   @{ $_[0] }{qw<
    codeblock_halfpoint_size
    head1_halfpoint_size
    head2_halfpoint_size
    head3_halfpoint_size
    head4_halfpoint_size
    head5_halfpoint_size
    head6_halfpoint_size
   >}
  ;
}

###########################################################################
# Override these as necessary for further customization

sub font_table {
  
  my $self = shift;
  return sprintf <<'END' ,  # text font, code font, heading font
{\fonttbl
{\f0\froman %s;}
{\f1\fmodern %s;}
{\f2\fswiss %s;}
}

END

  map {;       # custom-dumb escaper:
    my $x = $_;
    $x =~ s/([\x00-\x1F\\\{\}\x7F-\xFF])/sprintf("\\'%02x", $1)/g;
    $x =~ s/([^\x00-\xFF])/'\\uc1\\u'.((ord($1)<32768)?ord($1):(ord($1)-65536)).'?'/eg;
    $x;
  }
    $self->{'fontname_body'} || 'Times',
    $self->{'fontname_code'} || 'Courier New',
    $self->{'fontname_headings'} || 'Arial',
  ;
}

sub doc_init {
   return <<'END';
{\rtf1\ansi\deff0

END
}

sub color_table {
   return <<'END';
{\colortbl;\red255\green0\blue0;\red0\green0\blue255;}
END
}


sub doc_info {
   my $self = $_[0];
   return sprintf <<'END', $self->version_tag;
{\info{\doccomm generated by %s}
{\author [see doc]}{\company [see doc]}{\operator [see doc]}
}

END

}


sub doc_really_start {
  my $self = $_[0];

  return sprintf <<'END', 
\deflang%s\widowctrl
{\header\pard\qr\plain\f2\fs%s
p.\chpgn\par}
\fs%s

END
    $self->{'document_language'} || 1033,
    $self->{"header_halfpoint_size"},
    $self->{"normal_halfpoint_size"},
  ;
}

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sub emit_para {      # rather like showline in FormatPS
  my $self = shift;

  my $para = $self->{'Para'};
  $self->{'Para'} = undef;
  
  if(DEBUG > 4) {
    printf "     &emit_para called by %s\n", (caller(1) )[3];
  }
  
  unless( defined $para ) {
   #and length $para and $para =~ m/[^ ]/
    DEBUG > 20
     and print "   Emit_para is a no-op because para buffer is empty.\n";
    return;
  }

  $para =~ s/^ +//s;
  $para =~ s/ +$//s;
    
  if( DEBUG > 2 ) {
    my $p = $para;
    $p =~ tr/\n/\xB6/;
    substr($p,60) = "..." if length $p > 65;
    print "   Emit_para emits <$p> with vspace of ",
      $self->{'vspace'} || 'nil', "\n";
  }


  # And now: a not terribly clever algorithm for inserting newlines
  # at a guaranteed harmless place: after a block of whitespace
  # after the 65th column.  This was copied from RTF::Writer.
  $para =~
    s/(
       [^\cm\cj\n]{65}        # Snare 65 characters from a line
       [^\cm\cj\n\x20]{0,50}  #  and finish any current word
      )
      (\x20{1,10})(?![\cm\cj\n]) # capture some spaces not at line-end
     /$1$2\n/gx     # and put a NL before those spaces
  ;
  
  $self->collect(
    sprintf( '{\pard\sa%d\li%d\ri%d%s\plain'."\n",
      #100 + 
      10 * $self->{'normal_halfpoint_size'} * ($self->{'vspace'} || 0),
            
      $self->{'lm'},
      $self->{'rm'},
      
      $self->{'center'} ? '\qc' : '\ql',
    ),

    defined($self->{'next_bullet'}) ? do {
      my $bullet = $self->{'next_bullet'};
      $self->{'next_bullet'} = undef;
      sprintf "\\fi-%d\n%s",
        4.5 * $self->{'normal_halfpoint_size'},
        ($bullet eq '*') ? "\\'95 " : (rtf_esc($bullet). ". ")
    } : (),

    $para,
    "\n\\par}\n\n",
  );
    
  $self->{'vspace'} = undef; # we finally get to clear it here!

  return;
}

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

sub new_font_size {
  my $self = $_[0];
  $self->out(
    \ sprintf "{\\fs%u\n",
    $self->scale_font_for(
      $self->{'normal_halfpoint_size'}
    )
  );
}

sub restore_font_size { shift->out(  \ '}'  ) }

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

#sub bullet {
#  my $self = shift;
#  $self->SUPER::bullet($_[0] . ' ');
#}

sub hr_start {
  my $self = shift;
  # A bit of a hack:
  
  $self->vspace(.3);
  $self->out( \ ( '\qc\ul\f1\fs20\nocheck\lang1024 ' . ('\~' x (
    $self->{'hr_width'} || 50
  ) ) ) );
  $self->vspace(.7);
  1;
}


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

sub br_start {
  $_[0]->out( \"\\line\n" );
}

sub header_start { # for h1 ... h6's
  # This really should have been called heading_start, but it's too late
  #  to change now.
  
  my($self, $level) = @_;
  DEBUG > 1 and print "  Heading of level $level\n";

  #$self->adjust_lm(0); # assert new paragraph
  $self->vspace(1.5);
  
  $self->out( \( sprintf '\s3%s\ql\keepn\f2\fs%s\ul'."\n",
    $level,
    $self->{'head' . $level .'_halfpoint_size'},
    $level,
  ));
  
  return 1;
}

sub header_end {
  # This really should have been called heading_end but it's too late
  #  to change now.
  
  $_[0]->vspace(1);
  1;
}

sub bullet {
  my($self, $bullet) = @_;
  $self->{'next_bullet'} = $bullet;
  return;
}

sub adjust_lm {
  $_[0]->emit_para();
  $_[0]->{'lm'} += $_[1] * $_[0]->{'normal_halfpoint_size'} * 5;
  1;
}
sub adjust_rm {
  $_[0]->emit_para();
  $_[0]->{'rm'} -= $_[1] * $_[0]->{'normal_halfpoint_size'} * 5;
  1;
}   # Yes, flip the sign on the right margin!

    # BTW, halfpoints * 10 = twips

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

sub pre_start {
  my $self = shift;
  $self->SUPER::pre_start(@_);
  $self->out( \ sprintf
    '\s20\f1\fs%s\noproof\lang1024\lang1076 ',
    $self->{'codeblock_halfpoint_size'},
  );
  return 1;
}

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

sub  b_start  { shift->out( \'{\b ' ) }
sub  b_end    { shift->out( \'}'    ) }
sub  i_start  { shift->out( \'{\i ' ) }
sub  i_end    { shift->out( \'}'    ) }

sub tt_start  { shift->out( \'{\f1\noproof\lang1024\lang1076 ' ) }
                 # really really really don't spellcheck this bit!
sub tt_end    { shift->out( \'}'    ) }


sub sub_start     { shift->out( \'{\sub '   ) }
sub sub_end       { shift->out( \'}'        ) }
sub sup_start     { shift->out( \'{\super ' ) }
sub sup_end       { shift->out( \'}'        ) }

sub strike_start  { shift->out( \'{\strike ') }
sub strike_end    { shift->out( \'}'        ) }

sub q_start  {
  my $self = $_[0];
  $self->out(
    ( ( ++ $self->{'quotelevel'} ) % 2)  ?  \'\ldblquote '  :  \'\lquote '
  );
}

sub q_end    {
  my $self = $_[0];
  $self->out(
    ( ( -- $self->{'quotelevel'} ) % 2)  ?  \'\rquote '  :  \'\rdblquote '
  );
}

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

sub pre_out { $_[0]->out(  ref($_[1]) ? $_[1] : \ rtf_esc_codely($_[1])  ) }


sub out { # output a word (or, if escaped, chunk of RTF)
  my $self = shift;
  #return $self->pre_out(@_) if $self->{pre};

  if(DEBUG > 4) {
    printf "     &out(%s) called by %s\n", $_[0], (caller(1) )[3];
  }

  return unless defined $_[0]; # and length $_[0];

  $self->{'Para'} = '' unless defined $self->{'Para'};
  $self->{'Para'} .= ref($_[0]) ? ${$_[0]} : rtf_esc($_[0]);

  if( DEBUG > 4 ) {
    my $x = ref($_[0]) ? ${$_[0]} : rtf_esc($_[0]);
    $x =~ s/\n/\n\t\xB6/g;
    substr($x,60) = "..." if length $x > 65;
    print "    Queued for output: <$x>\n";
  }

  return 1;
}


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

use integer;
sub rtf_esc {
  my $x; # scratch
  if(!defined wantarray) { # void context: alter in-place!
    for(@_) {
      s/([F\x00-\x1F\-\\\{\}\x7F-\xFF])/$Escape{$1}/g;  # ESCAPER
      s/([^\x00-\xFF])/'\\uc1\\u'.((ord($1)<32768)?ord($1):(ord($1)-65536)).'?'/eg;
    }
    return;
  } elsif(wantarray) {  # return an array
    return map {; ($x = $_) =~
      s/([F\x00-\x1F\-\\\{\}\x7F-\xFF])/$Escape{$1}/g;  # ESCAPER
      $x =~ s/([^\x00-\xFF])/'\\uc1\\u'.((ord($1)<32768)?ord($1):(ord($1)-65536)).'?'/eg;
             # Hyper-escape all Unicode characters.
      $x;
    } @_;
  } else { # return a single scalar
    ($x = ((@_ == 1) ? $_[0] : join '', @_)
    ) =~ s/([F\x00-\x1F\-\\\{\}\x7F-\xFF])/$Escape{$1}/g;  # ESCAPER
             # Escape \, {, }, -, control chars, and 7f-ff.
    $x =~ s/([^\x00-\xFF])/'\\uc1\\u'.((ord($1)<32768)?ord($1):(ord($1)-65536)).'?'/eg;
             # Hyper-escape all Unicode characters.
    return $x;
  }
}

sub rtf_esc_codely {
  # Doesn't change "-" to hard-hyphen, nor apply computerese style
  
  my $x; # scratch
  if(!defined wantarray) { # void context: alter in-place!
    for(@_) {
      s/([F\x00-\x1F\\\{\}\x7F-\xFF])/$Escape{$1}/g;
      s/([^\x00-\xFF])/'\\uc1\\u'.((ord($1)<32768)?ord($1):(ord($1)-65536)).'?'/eg;
             # Hyper-escape all Unicode characters.
    }
    return;
  } elsif(wantarray) {  # return an array
    return map {; ($x = $_) =~
      s/([F\x00-\x1F\\\{\}\x7F-\xFF])/$Escape{$1}/g;
      $x =~ s/([^\x00-\xFF])/'\\uc1\\u'.((ord($1)<32768)?ord($1):(ord($1)-65536)).'?'/eg;
             # Hyper-escape all Unicode characters.
      $x;
    } @_;
  } else { # return a single scalar
    ($x = ((@_ == 1) ? $_[0] : join '', @_)
    ) =~ s/([F\x00-\x1F\\\{\}\x7F-\xFF])/$Escape{$1}/g;
             # Escape \, {, }, -, control chars, and 7f-ff.
    $x =~ s/([^\x00-\xFF])/'\\uc1\\u'.((ord($1)<32768)?ord($1):(ord($1)-65536)).'?'/eg;
             # Hyper-escape all Unicode characters.
    return $x;
  }
}

%Escape = (
  map( (chr($_),chr($_)),       # things not apparently needing escaping
       0x20 .. 0x7E ),
  map( (chr($_),sprintf("\\'%02x", $_)),    # apparently escapeworthy things
       0x00 .. 0x1F, 0x5c, 0x7b, 0x7d, 0x7f .. 0xFF, 0x46),

  # We get to escape out 'F' so that we can send RTF files thru the mail
  # without the slightest worry that paragraphs beginning with "From"
  # will get munged.

  # And some refinements:
  #"\n"   => "\n\\line ",
  #"\cm"  => "\n\\line ",
  #"\cj"  => "\n\\line ",

  "\t"   => "\\tab ",     # Tabs (altho theoretically raw \t's are okay)
# "\f"   => "\n\\page\n", # Formfeed
  "-"    => "\\_",        # Turn plaintext '-' into a non-breaking hyphen
  "\xA0" => "\\~",        # Latin-1 non-breaking space
  "\xAD" => "\\-",        # Latin-1 soft (optional) hyphen

  # CRAZY HACKS:
  "\n" => "\\line\n",
  "\r" => "\n",
# "\cb" => "{\n\\cs21\\lang1024\\noproof ",  # \\cf1
# "\cc" => "}",
);



1;

__END__

=head1 NAME

HTML::FormatRTF - Format HTML as RTF

=head1 SYNOPSIS

  use HTML::FormatRTF;

  my $out_file = "test.rtf";
  open(RTF, ">$out_file")
   or die "Can't write-open $out_file: $!\nAborting";
   
  print RTF HTML::FormatRTF->format_file(
    'test.html',
      'fontname_headings' => "Verdana",
  );
  close(RTF);

=head1 DESCRIPTION

HTML::FormatRTF is a class for objects that you use to convert HTML to
RTF.  There is currently no proper support for tables or forms.

This is a subclass of L<HTML::Formatter>, whose documentation you should
consult for more information on the new, format, format_file 

You can specify any of the following parameters in the call to C<new>,
C<format_file>, or C<format_string>:

=over

=item lm

Amount of I<extra> indenting to apply to the left margin, in twips
(I<tw>entI<i>eths of a I<p>oint). Default is 0.

So if you wanted the left margin to be an additional half inch larger,
you'd set C<< lm => 720 >> (since there's 1440 twips in an inch).
If you wanted it to be about 1.5cm larger, you'd set 
C<< lw => 850 >> (since there's about 567 twips in a centimeter).

=item rm

Amount of I<extra> indenting to apply to the left margin, in twips
(I<tw>entI<i>eths of a I<p>oint).  Default is 0.

=item normal_halfpoint_size

This is the size of normal text in the document, in I<half>-points.
The default value is 22, meaning that normal text is in 11 point.

=item header_halfpoint_size

This is the size of text used in the document's page-header, in
I<half>-points. The default value is 17, meaning that normal text is in
7.5 point.  Currently, the header consists just of "p.I<pagenumber>"
in the upper-right-hand corner, and cannot be disabled.

=item head1_halfpoint_size ... head6_halfpoint_size

These control the font size of each heading level, in half-twips.  For
example, the default for head3_halfpoint_size is 25, meaning that HTML
C<< <h3>...</h3> >> text will be in 12.5 point text (in addition to being
underlined and in the heading font).

=item codeblock_halfpoint_size

This controls the font size (in half-points) of the text used for 
C<< <pre>...</pre> >> text.  By default, it is 18, meaning 9 point.



=item fontname_body

This option controls what font is to be used for the body of the
text -- that is, everything other than heading text and text in
pre/code/tt elements. The default value is currently "Times".  Other
handy values I can suggest using are "Georgia" or "Bookman Old Style".

=item fontname_code

This option controls what font is to be used for text in pre/code/tt
elements. The default value is currently "Courier New".

=item fontname_headings

This option controls what font name is to be used for headings.  You can
use the same font as fontname_body, but I prefer a sans-serif font, so
the default value is currently "Arial".  Also consider
"Tahoma" and "Verdana".


=item document_language

This option controls what Microsoft language number will be specified as
the language for this document. The current default value is 1033, for
US English. Consult an RTF reference for other language numbers.

=item hr_width

This option controls how many underline characters will be used for
rendering a "<hr>" tag. Its default value is currently 50. You can
usually leave this alone, but under some circumstances you might want to
use a smaller or larger number.


=item no_prolog

If this option is set to a true value, HTML::FormatRTF will make a point of
I<not> emitting the RTF prolog before the document.  By default, this is
off, meaning that HTML::FormatRTF I<will> emit the prolog.  This option
is of interest only to advanced users.

=item no_trailer

If this option is set to a true value, HTML::FormatRTF will make a point of
I<not> emitting the RTF trailer at the end of the document.  By default,
this is off, meaning that HTML::FormatRTF I<will> emit the bit of RTF
that ends the document.  This option is of interest only to advanced
users.


=back


=head1 SEE ALSO

L<HTML::Formatter>, L<RTF::Writer>

=head1 COPYRIGHT

Copyright (c) 2002 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<< <sburke@cpan.org> >>

=cut