HTML::FormatRTF - Format HTML as RTF

  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);

package HTML::FormatRTF;

# ABSTRACT: Format HTML as RTF


use 5.006_001;
use strict;
use warnings;

# We now use Smart::Comments in place of the old DEBUG framework.
# this should be commented out in release versions....
##use Smart::Comments;

use base 'HTML::Formatter';

our $VERSION = '2.07'; # VERSION
our $AUTHORITY = 'cpan:NIGELM'; # AUTHORITY

# ------------------------------------------------------------------------
my %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" => "}",
);

# ------------------------------------------------------------------------
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 ) = shift;

    $self->{lm} = 0;
    $self->{rm} = 0;

    # include the hash parameters into self - as RT#56278
    map { $self->{$_} = $hash->{$_} } keys %$hash if ( ref($hash) );
    $self;
}

# ------------------------------------------------------------------------
sub begin {
    my $self = shift;

    ### Start document...
    $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

    ### End document...
    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;

    #### emit_para called by: (caller(1) )[3];

    unless ( defined $para ) {
        #### emit_para with empty buffer...
        return;
    }

    $para =~ s/^ +//s;
    $para =~ s/ +$//s;

    # 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 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 {
    my ( $self, $level ) = @_;

    # for h1 ... h6's
    # This really should have been called heading_start, but it's too late
    #  to change now.

    ### Heading of level: $level
    #$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 ' ) }
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};

    #### out called by: $_[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] );

    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;
    }
}

1;

__END__