package LaTeX::TikZ::Context;
use strict;
use warnings;
=head1 NAME
LaTeX::TikZ::Context - An object modeling in which context a set is evaluated.
=head1 VERSION
Version 0.03
=cut
our $VERSION = '0.03';
use LaTeX::TikZ::Mod (); # Required to work around a bug in Mouse
use LaTeX::TikZ::Tools;
use Mouse;
=head1 ATTRIBUTES
=head2 C<parent>
The parent context of the current one, or C<undef> for the topmost context.
=cut
has 'parent' => (
is => 'ro',
isa => 'Maybe[LaTeX::TikZ::Context]',
required => 0,
default => undef,
);
=head2 C<mods>
The list of mods that are asked to be applied in this context.
=cut
has '_mods' => (
is => 'ro',
isa => 'ArrayRef[LaTeX::TikZ::Mod]',
required => 0,
default => sub { [ ] },
init_arg => 'mods',
);
sub mods { @{$_[0]->_mods} }
has '_applied_mods' => (
is => 'ro',
isa => 'HashRef[LaTeX::TikZ::Mod]',
required => 0,
default => sub { { } },
init_arg => undef,
);
=head2 C<effective_mods>
The list of mods that actually need to be applied in this context.
=cut
has '_effective_mods' => (
is => 'ro',
isa => 'ArrayRef[LaTeX::TikZ::Mod]',
required => 0,
default => sub { [ ] },
init_arg => undef,
);
sub effective_mods { @{$_[0]->_effective_mods} }
has '_last_mod' => (
is => 'rw',
isa => 'Int',
required => 0,
default => 0,
init_arg => undef,
);
my $ltml_tc = LaTeX::TikZ::Tools::type_constraint('LaTeX::TikZ::Mod::Layer');
sub BUILD {
my $cxt = shift;
my $pcxt = $cxt->parent;
my $applied_mods = $cxt->_applied_mods;
for (my $c = $pcxt; defined $c; $c = $c->parent) {
my $mods = $c->_applied_mods;
while (my ($tag, $mods_info) = each %$mods) {
unshift @{$applied_mods->{$tag}}, @$mods_info;
}
}
my $last_mod = defined $pcxt ? $pcxt->_last_mod : 0;
my $effective_mods = $cxt->_effective_mods;
my $last_layer;
MOD:
for my $mod ($cxt->mods) {
my $is_layer = $ltml_tc->check($mod);
$last_layer = $mod if $is_layer;
my $tag = $mod->tag;
my $old = $applied_mods->{$tag} || [];
for (@$old) {
next MOD if $_->[0]->covers($mod);
}
push @{$applied_mods->{$tag}}, [ $mod, $last_mod++, $is_layer ];
push @$effective_mods, $mod;
}
if ($last_layer) {
# Clips and mods don't propagate through layers. Hence, if a layer is set,
# we should force their reuse.
@$effective_mods = $last_layer;
push @$effective_mods, map $_->[0],
sort { $a->[1] <=> $b->[1] }
grep !$_->[2],
map @$_,
values %$applied_mods;
}
$cxt->_last_mod($last_mod);
}
=head1 SEE ALSO
L<LaTeX::TikZ>.
=head1 AUTHOR
Vincent Pit, C<< <perl at profvince.com> >>, L<http://www.profvince.com>.
You can contact me by mail or on C<irc.perl.org> (vincent).
=head1 BUGS
Please report any bugs or feature requests to C<bug-latex-tikz at rt.cpan.org>, or through the web interface at L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=LaTeX-TikZ>.
I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
=head1 SUPPORT
You can find documentation for this module with the perldoc command.
perldoc LaTeX::TikZ
=head1 COPYRIGHT & LICENSE
Copyright 2010,2011,2012,2013,2014,2015 Vincent Pit, all rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
=cut
1; # End of LaTeX::TikZ::Context