#!./perl

use strict;
use Encode;
use Getopt::Std;
my %Opt; getopts("ChH:e:f:t:s:pPv", \%Opt);
$Opt{p} ||= $Opt{P};
$Opt{e} ||= 'utf8';
$Opt{f} ||= $Opt{e};
$Opt{t} ||= $Opt{e};
$Opt{h} and help();

my ($linebuf, $outbuf);
my $CPL = $Opt{p} ? 64 : 8;
my $linenum;
my $linesperheading = $Opt{H};
my $nchars;
our $PrevChunk;

$Opt{h} and help();
$Opt{p} and do_perl($Opt{s});
do_dump($Opt{s});
exit;

#

sub do_perl{
    my $string = shift;
    $Opt{P} and print "#!$^X -w\nprint\n";
    unless ($string){
	while(<>){
	    use utf8;
	    $linebuf .=  Encode::decode($Opt{f}, $_);
	    while($linebuf){
		my $chr =  render_p(substr($linebuf, 0, 1, ''));
		length($outbuf) + length($chr) > $CPL and print_P();
		$outbuf .= $chr;
	    }
	}
	$outbuf and print print_P(";");
    }else{
	while($string){
	    my $chr =  render_p(substr($string, 0, 1, ''));
	    length($outbuf) + length($chr) > $CPL and print_P();
	    $outbuf .= $chr;
	}
    }
    $outbuf and print print_P(";");
    exit;
}

sub render_p{
    my ($chr, $format) = @_;
    our %S2pstr;
    $S2pstr{$chr} and return $S2pstr{$chr}; # \t\n...
    $chr =~ /[\x20-\x7e]/ and return $chr;  # ascii, printable;
    my $fmt = ($chr =~ /[\x00-\x1f\x7F]/)  ?
	q(\x%x) : q(\x{%x});
    return sprintf $fmt, ord($chr);
}

sub print_P{
    my $end = shift;
    $outbuf or return;
    print '"', encode($Opt{t}, $outbuf), '"';
    my $tail = $Opt{P} ? $end ? "$end" :  "," : '';
    print $tail, "\n";
    $outbuf = '';
}

sub do_dump{
    my $string = shift;
    !$Opt{p} and exists $Opt{H} and print_H();
    unless ($string){
	while(<>){
	    use utf8;
	    $linebuf .=  Encode::decode($Opt{f}, $_);
	    while (length($linebuf) > $CPL){
		my $chunk = substr($linebuf, 0, $CPL, '');
		print_C($chunk, $linenum++);
		$Opt{H} and $linenum % $Opt{H} == $CPL-1 and print_S();
	    }
	}
	$linebuf and print_C($linebuf);
    }else{
	while ($string){
	    my $chunk = substr($string, 0, $CPL, '');
	    print_C($chunk, $linenum++);
	    $Opt{H} and $linenum % $Opt{H} == $CPL-1 and print_S();
	}
    }
    exit;
}

sub print_S{
    print "--------+------------------------------------------------";
    if ($Opt{C}){
	print "-+-----------------";
    }
    print "\n";
}
sub print_H{
    print "  Offset      0     1     2     3     4     5     6     7";
    if ($Opt{C}){
	print " |  0 1 2 3 4 5 6 7";
    }
    print "\n";
    print_S;
}

sub print_C{
    my ($chunk, $linenum) = @_;
    if (!$Opt{v} and $chunk eq $PrevChunk){
	printf "%08x *\n", $linenum*8; return;
    }
    $PrevChunk = $chunk;
    my $end = length($chunk) - 1;
    my (@ord, @chr);
    for my $i (0..$end){
	use utf8;
	my $chr = substr($chunk,$i,1);
	my $ord = ord($chr);
	my $fmt = $ord <= 0xffff ? "  %04x" : " %05x";
	push @ord, (sprintf $fmt, $ord);
	$Opt{C} and push @chr, render_c($chr);
    }
    if (++$end < 7){
	for my $i ($end..7){
	    push @ord, (" " x 6);
	}
    }
    my $line = sprintf "%08x %s", $linenum*8, join('', @ord);
    $Opt{C} and $line .= sprintf " | %s",  join('', @chr);
    print encode($Opt{t}, $line), "\n";
}

sub render_c{
    my ($chr, $format) = @_;
    our (%S2str, $IsFullWidth);
    $chr =~ /[\p{IsControl}\s]/o and return $S2str{$chr} || "  ";
    $chr =~ $IsFullWidth and return $chr; # as is
    return " " . $chr;
}

sub help{
    my $message = shift;
    use File::Basename;
    my $name = basename($0);
    $message and print STDERR "$name error: $message\n";
    print STDERR <<"EOT";
Usage:
  $name -[options...] [files...]
  $name -[options...] -s "string"
  $name -h
  -h prints this message.
Inherited from hexdump;
  -C Canonical unidump mode
  -v prints the duplicate line as is.  Without this option,
     single "*" will be printed instead.
For unidump only
  -p prints in perl literals that you can copy and paste directly
     to your perl script.
  -P prints in perl executable format!
  -u prints a bunch of "Uxxxx,".  Handy when you want to pass your
     characters in mailing lists. 
IO Options:
  -e io_encoding    same as "-f io_encoding -t io_encoding"
  -f from_encoding  convert the source stream from this encoding
  -t to_encoding    print to STDOUT in this encoding
  -s string         "string" will be converted instead of STDIN.
  -H nline          prints separater for each nlines of output.
                    0 means only the table headding be printed.
EOT
  exit;
}

BEGIN{
    our %S2pstr= (
		  "\\" => '\\\\',
		  "\0" => '\0',
		  "\t" => '\t',
		  "\n" => '\n',
		  "\r" => '\r',
		  "\v" => '\v',
		  "\a" => '\a',
		  "\e" => '\e',
		  "\"" => qq(\\\"),
		  "\'" => qq(\\\'),
		  '$'  => '\$',
		  "@"  => '\@',
		  "%"  => '\%',
		 );

    our %S2str = (
		  qq(\x00) => q(\0),  # NULL
		  qq(\x01) => q(^A),  # START OF HEADING
		  qq(\x02) => q(^B),  # START OF TEXT
		  qq(\x03) => q(^C),  # END OF TEXT
		  qq(\x04) => q(^D),  # END OF TRANSMISSION
		  qq(\x05) => q(^E),  # ENQUIRY
		  qq(\x06) => q(^F),  # ACKNOWLEDGE
		  qq(\x07) => q(\a),  # BELL
		  qq(\x08) => q(^H),  # BACKSPACE
		  qq(\x09) => q(\t),  # HORIZONTAL TABULATION
		  qq(\x0A) => q(\n),  # LINE FEED
		  qq(\x0B) => q(\v),  # VERTICAL TABULATION
		  qq(\x0C) => q(^L),  # FORM FEED
		  qq(\x0D) => q(\r),  # CARRIAGE RETURN
		  qq(\x0E) => q(^N),  # SHIFT OUT
		  qq(\x0F) => q(^O),  # SHIFT IN
		  qq(\x10) => q(^P),  # DATA LINK ESCAPE
		  qq(\x11) => q(^Q),  # DEVICE CONTROL ONE
		  qq(\x12) => q(^R),  # DEVICE CONTROL TWO
		  qq(\x13) => q(^S),  # DEVICE CONTROL THREE
		  qq(\x14) => q(^T),  # DEVICE CONTROL FOUR
		  qq(\x15) => q(^U),  # NEGATIVE ACKNOWLEDGE
		  qq(\x16) => q(^V),  # SYNCHRONOUS IDLE
		  qq(\x17) => q(^W),  # END OF TRANSMISSION BLOCK
		  qq(\x18) => q(^X),  # CANCEL
		  qq(\x19) => q(^Y),  # END OF MEDIUM
		  qq(\x1A) => q(^Z),  # SUBSTITUTE
		  qq(\x1B) => q(\e),  # ESCAPE (\c[)
		  qq(\x1C) => "^\\",  # FILE SEPARATOR
		  qq(\x1D) => "^\]",  # GROUP SEPARATOR
		  qq(\x1E) => q(^^),  # RECORD SEPARATOR
		  qq(\x1F) => q(^_),  # UNIT SEPARATOR
		  );
    #
    # Generated out of lib/unicore/EastAsianWidth.txt 
    # will it work ?
    #		  
    our $IsFullWidth = 
	qr/^[
	     \x{1100}-\x{1159}
	     \x{115F}-\x{115F}
	     \x{2329}-\x{232A}
	     \x{2E80}-\x{2E99}
	     \x{2E9B}-\x{2EF3}
	     \x{2F00}-\x{2FD5}
	     \x{2FF0}-\x{2FFB}
	     \x{3000}-\x{303E}
	     \x{3041}-\x{3096}
	     \x{3099}-\x{30FF}
	     \x{3105}-\x{312C}
	     \x{3131}-\x{318E}
	     \x{3190}-\x{31B7}
	     \x{31F0}-\x{321C}
	     \x{3220}-\x{3243}
	     \x{3251}-\x{327B}
	     \x{327F}-\x{32CB}
	     \x{32D0}-\x{32FE}
	     \x{3300}-\x{3376}
	     \x{337B}-\x{33DD}
	     \x{3400}-\x{4DB5}
	     \x{4E00}-\x{9FA5}
	     \x{33E0}-\x{33FE}
	     \x{A000}-\x{A48C}
	     \x{AC00}-\x{D7A3}
	     \x{A490}-\x{A4C6}
	     \x{F900}-\x{FA2D}
	     \x{FA30}-\x{FA6A}
	     \x{FE30}-\x{FE46}
	     \x{FE49}-\x{FE52}
	     \x{FE54}-\x{FE66}
	     \x{FE68}-\x{FE6B}
	     \x{FF01}-\x{FF60}
	     \x{FFE0}-\x{FFE6}
	     \x{20000}-\x{2A6D6}
	 ]$/xo;
}

__END__
