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package LaTeX::TikZ::Functor::Rule; |
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use strict; |
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use warnings; |
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=head1 NAME |
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LaTeX::TikZ::Functor::Rule - An object that specifies how functors should handle a certain kind of set or mod. |
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=head1 VERSION |
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Version 0.02 |
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=cut |
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our $VERSION = '0.02'; |
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=head1 DESCRIPTION |
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A rule specifies how functors (L<LaTeX::TikZ::Functor> objects) should handle a certain kind of set or mod. |
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A functor is basically an ordered collection of rules. |
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=cut |
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use Carp (); |
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use Any::Moose; |
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use Any::Moose 'Util' => [ qw[find_meta does_role] ]; |
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use Any::Moose 'Util::TypeConstraints'; |
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=head1 ATTRIBUTES |
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=head2 C<target> |
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A class or role name against which set or mod candidates will be matched. |
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It must consume either L<LaTeX::TikZ::Set> or L<LaTeX::TikZ::Mod>, directly or through inheritance. |
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=cut |
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has 'target' => ( |
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is => 'ro', |
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isa => 'ClassName|RoleName', |
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required => 1, |
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); |
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=head2 C<handler> |
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The code reference executed when the rule handles a given set or mod object. |
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It is called with the L<LaTeX::TikZ::Functor> object as its first argument, the set/mod object as its second, and then the arguments passed to the functor itself. |
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=cut |
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has 'handler' => ( |
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is => 'ro', |
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isa => 'CodeRef', |
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required => 1, |
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); |
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=head2 C<is_role> |
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True if and only if the target is a role. |
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=cut |
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has 'is_role' => ( |
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is => 'ro', |
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isa => 'Bool', |
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required => 1, |
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); |
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=head2 C<is_set> |
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True when the target does the L<LaTeX::TikZ::Set> role, and false when it does L<LaTeX::TikZ::Mod>. |
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=cut |
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has 'is_set' => ( |
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is => 'ro', |
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isa => 'Bool', |
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required => 1, |
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); |
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my $ltfrl_tc = subtype 'LaTeX::TikZ::Functor::RuleList' |
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=> as 'ArrayRef[LaTeX::TikZ::Functor::Rule]'; |
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=head1 METHODS |
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=head2 C<< new target => $target, handler => $handler >> |
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Constructs a new rule object with target C<$target> and handler C<$handler>. |
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=cut |
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around 'BUILDARGS' => sub { |
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my ($orig, $class, %args) = @_; |
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my $target = $args{target}; |
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__PACKAGE__->meta->find_attribute_by_name('target') |
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->type_constraint->assert_valid($target); |
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(my $pm = $target) =~ s{::}{/}g; |
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$pm .= '.pm'; |
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require $pm; |
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my $meta = find_meta($target); |
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Carp::confess("No meta object associated with target $target") |
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unless defined $meta; |
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$args{is_role} = $meta->isa(any_moose('Meta::Role')); |
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my $is_set; |
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if (does_role($target, 'LaTeX::TikZ::Set')) { |
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$is_set = 1; |
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} elsif (does_role($target, 'LaTeX::TikZ::Mod')) { |
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$is_set = 0; |
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} else { |
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Carp::confess("Target $target is neither a set nor a mod"); |
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} |
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$args{is_set} = $is_set; |
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$class->$orig(%args); |
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}; |
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=head2 C<< insert into => \@list, overwrite => $overwrite, replace => $replace >> |
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Inserts the current rule into the list of rules C<@list>. |
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If C<$replace> is false, then the rule will be appended to the C<@list> ; except if there already is an existent entry for the same target, in which case it will be overwritten if C<$overwrite> is true, or an exception will be thrown if it is false. |
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If C<$replace> is true, then the rule will replace the first rule in the list that is a subclass or that consumes the role denoted by the target. |
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All the subsequent rules in the list that inherit or consume the target will be removed. |
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=cut |
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sub insert { |
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my ($rule, %args) = @_; |
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my $list = $args{into}; |
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$ltfrl_tc->assert_valid($list); |
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my $overwrite = $args{overwrite}; |
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my $replace = $args{replace}; |
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my $target = $rule->target; |
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my $is_role = $rule->is_role; |
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if ($replace) { |
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1
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my @remove; |
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1
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for my $i (0 .. $#$list) { |
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1
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my $old_target = $list->[$i]->target; |
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1
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if ($rule->handles($old_target)) { |
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1
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if (defined $rule) { |
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1
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splice @$list, $i, 1, $rule; |
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$rule = undef; |
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} else { |
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push @remove, $i; |
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} |
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} |
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} |
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1
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3
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my $shift; |
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1
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for (@remove) { |
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splice @$list, $_ - $shift, 1; |
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++$shift; |
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} |
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1
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return 1 unless defined $rule; |
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} else { # Replace only an existent rule |
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for my $i (0 .. $#$list) { |
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736
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my $old_target = $list->[$i]->target; |
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904
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if ($old_target eq $target) { |
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Carp::confess("Default rule already defined for target $target") |
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unless $overwrite; |
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splice @$list, $i, 1, $rule; |
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return 1; |
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} |
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} |
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} |
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push @$list, $rule; |
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return 0; |
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} |
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185
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=head2 C<handles $obj> |
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Returns true if and only if the current rule can handle the object or class/role name C<$obj>. |
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189
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=cut |
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191
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sub handles { |
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7
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1
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my ($rule, $obj) = @_; |
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194
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$rule->is_role ? does_role($obj, $rule->target) : $obj->isa($rule->target); |
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} |
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197
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__PACKAGE__->meta->make_immutable; |
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199
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=head1 SEE ALSO |
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201
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L<LaTeX::TikZ>, L<LaTeX::TikZ::Functor>. |
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203
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=head1 AUTHOR |
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205
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Vincent Pit, C<< <perl at profvince.com> >>, L<http://www.profvince.com>. |
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207
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You can contact me by mail or on C<irc.perl.org> (vincent). |
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209
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=head1 BUGS |
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211
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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>. |
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I will be notified, and then you'll automatically be notified of progress on your bug as I make changes. |
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214
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=head1 SUPPORT |
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216
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You can find documentation for this module with the perldoc command. |
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218
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perldoc LaTeX::TikZ |
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220
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=head1 COPYRIGHT & LICENSE |
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222
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Copyright 2010 Vincent Pit, all rights reserved. |
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This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. |
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=cut |
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1; # End of LaTeX::TikZ::Functor::Rule |