Prima::PS::Encodings - manage latin-based encodings

Prima documentation Contained in the Prima distribution.

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NAME

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Prima::PS::Encodings - manage latin-based encodings

SYNOPSIS

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	use Prima::PS::Encodings;

DESCRIPTION

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This module provides code tables for major latin-based encodings, for the glyphs that usually provided by every PS-based printer or interpreter. Prima::PS::Drawable uses these encodings when it decides whether the document have to be supplied with a bitmap character glyph or a character index, thus relying on PS interpreter capabilities. Latter is obviously preferable, but as it's not possible to know beforehand what glyphs are supported by PS interpreter, the Latin glyph set was selected as a ground level.

files

It's unlikely that users will need to supply their own encodings, however this can be accomplished by:

	use Prima::PS::Encodings;
	$Prima::PS::Encodings::files{iso8859-5} = 'PS/locale/greek-iso';
fontspecific

The only non-latin encoding currently present is 'Specific'. If any other specific-encoded fonts are to be added, the encoding string must be added as a key to %fontspecific

load

Loads encoding file by given string. Tries to be smart to guess actual file from identifier string returned from setlocale(NULL). If fails, loads default encoding, which defines only glyphs from 32 to 126. Special case is 'null' encoding, returns array of 256 .notdef's.

unique

Returns list of Latin-based encoding string unique keys.

Prima documentation Contained in the Prima distribution. 
#
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#  Created by Dmitry Karasik <dk@plab.ku.dk>
#  $Id$
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package Prima::PS::Encodings;
use vars qw(%files %fontspecific %cache);

use strict;
use Prima::Utils;

%files = (
	'default'    => 'PS/locale/ascii',
	'1276'       => 'PS/locale/ps-standart',
	'ps-standart'=> 'PS/locale/ps-standart',
	'1277'       => 'PS/locale/ps-iso-latin1',
	'ps-latin1'  => 'PS/locale/ps-iso-latin1',
	'Latin1'     => 'PS/locale/ps-iso-latin1',
	'iso8859-1'  => 'PS/locale/iso8859-1',
	'iso8859-2'  => 'PS/locale/iso8859-2',
	'iso8859-3'  => 'PS/locale/iso8859-3',
	'iso8859-4'  => 'PS/locale/iso8859-4',
	'iso8859-7'  => 'PS/locale/iso8859-7',
	'iso8859-9'  => 'PS/locale/iso8859-9',
	'iso8859-10' => 'PS/locale/iso8859-10',
	'iso8859-11' => 'PS/locale/iso8859-11',
	'iso8859-13' => 'PS/locale/iso8859-13',
	'iso8859-14' => 'PS/locale/iso8859-14',
	'iso8859-15' => 'PS/locale/iso8859-15',
	'ibm-437'    => 'PS/locale/ibm-cp437',
	'437'        => 'PS/locale/ibm-cp437',
	'ibm-850'    => 'PS/locale/ibm-cp850',
	'850'        => 'PS/locale/ibm-cp850',
	'win-1250'   => 'PS/locale/win-cp1250',
	'1250'       => 'PS/locale/win-cp1250',
	'win-1252'   => 'PS/locale/win-cp1252',
	'1252'       => 'PS/locale/win-cp1252',
);

%fontspecific = (
	'Specific' => 1,
);

sub exists
{
	my $cp = defined( $_[0]) ? ( lc $_[0]) : 'default';
	$cp = $1 if $cp =~ /\.([^\.]*)$/;
	$cp =~ s/_//g;
	return exists($files{$cp});
}

sub unique
{
	my %h;
	my @ret;
	for (sort keys %files) {
		next if m/^\d+$/ || $h{$files{$_}};
		$h{$files{$_}} = 1;
		push @ret, $_;
	}
	return @ret;
}

sub load
{
	my $cp = defined( $_[0]) ? $_[0] : 'default';
	$cp = $1 if $cp =~ /\.([^\.]*)$/;
	$cp =~ s/_//g;

	if ( $cp eq 'null') {
		return $cache{null} if exists $cache{null};
		return $cache{null} = [('.notdef') x 256];
	}

	my $fx = exists($files{$cp}) ? $files{$cp} : $files{default};

	return $cache{$fx} if exists $cache{$fx};

	my $f = Prima::Utils::find_image( $fx); 
	unless ( $f) {
		warn("Prima::PS::Encodings: cannot find encoding file for $cp\n");
		return load('default') unless $cp eq 'default';
		return;
	}

	unless ( open F, $f) {
		warn("Prima::PS::Encodings: cannot load $f\n");
		return load('default') unless $cp eq 'default';
		return;
	}
	my @f = map { chomp; length($_) ? $_ : ()} <F>;
	close F;
	splice( @f, 256) if 256 < @f;
	push( @f, '.notdef') while 256 > @f;
	return $cache{$fx} = \@f;
}

__END__