package Font::TTF::Prop;

=head1 NAME

Font::TTF::Prop - Glyph Properties table in a font

=head1 DESCRIPTION

=head1 INSTANCE VARIABLES

=over

=item version

=item default

=item lookup

Hash of property values keyed by glyph number

=item lookupFormat

=back

=head1 METHODS

=cut

use strict;

use vars qw(@ISA);

use Font::TTF::Utils;

use Font::TTF::AATutils;

use Font::TTF::Segarr;

@ISA = qw(Font::TTF::Table);

=head2 $t->read

Reads the table into memory

=cut

sub read

{

    my ($self) = @_;

    my ($dat, $fh);

    my ($version, $lookupPresent, $default);

    $self->SUPER::read or return $self;

    $fh = $self->{' INFILE'};

    $fh->read($dat, 8);

    ($version, $lookupPresent, $default) = TTF_Unpack("vSS", $dat);

    if ($lookupPresent) {

        my ($format, $lookup) = AAT_read_lookup($fh, 2, $self->{' LENGTH'} - 8, $default);

        $self->{'lookup'} = $lookup;

        $self->{'format'} = $format;

    }

    $self->{'version'} = $version;

    $self->{'default'} = $default;

    $self;

}

=head2 $t->out($fh)

Writes the table to a file either from memory or by copying

=cut

sub out

{

    my ($self, $fh) = @_;

    my ($default, $lookup);

    return $self->SUPER::out($fh) unless $self->{' read'};

    $default = $self->{'default'};

    $lookup = $self->{'lookup'};

    $fh->print(TTF_Pack("vSS", $self->{'version'}, (defined $lookup ? 1 : 0), $default));

    AAT_write_lookup($fh, $self->{'format'}, $lookup, 2, $default) if (defined $lookup);

}

=head2 $t->minsize()

Returns the minimum size this table can be. If it is smaller than this, then the table

must be bad and should be deleted or whatever.

=cut

sub minsize

{

    return 8;

}

=head2 $t->print($fh)

Prints a human-readable representation of the table

=cut

sub print

{

    my ($self, $fh) = @_;

    my ($lookup);

    $self->read;

    $fh = 'STDOUT' unless defined $fh;

    $fh->printf("version %f\ndefault %04x # %s\n", $self->{'version'}, $self->{'default'}, meaning_($self->{'default'}));

    $lookup = $self->{'lookup'};

    if (defined $lookup) {

        $fh->printf("format %d\n", $self->{'format'});

        foreach (sort { $a <=> $b } keys %$lookup) {

            $fh->printf("\t%d -> %04x # %s\n", $_, $lookup->{$_}, meaning_($lookup->{$_}));

        }

    }

}

sub meaning_

{

    my ($val) = @_;

    my ($res);

    my @types = (

        "Strong left-to-right",

        "Strong right-to-left",

        "Arabic letter",

        "European number",

        "European number separator",

        "European number terminator",

        "Arabic number",

        "Common number separator",

        "Block separator",

        "Segment separator",

        "Whitespace",

        "Other neutral");

    $res = $types[$val & 0x001f] or ("Undefined [" . ($val & 0x001f) . "]");

    $res .= ", floater" if $val & 0x8000;

    $res .= ", hang left" if $val & 0x4000;

    $res .= ", hang right" if $val & 0x2000;

    $res .= ", attaches on right" if $val & 0x0080;

    $res .= ", pair" if $val & 0x1000;

    my $pairOffset = ($val & 0x0f00) >> 8;

    $pairOffset = $pairOffset - 16 if $pairOffset > 7;

    $res .= $pairOffset > 0 ? " +" . $pairOffset : $pairOffset < 0 ? " " . $pairOffset : "";

    $res;

}

1;

=head1 BUGS

None known

=head1 AUTHOR

Jonathan Kew L<http://scripts.sil.org/FontUtils>. 

=head1 LICENSING

Copyright (c) 1998-2016, SIL International (http://www.sil.org) 

This module is released under the terms of the Artistic License 2.0. 

For details, see the full text of the license in the file LICENSE.

=cut