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#! perl |
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use strict; |
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use warnings; |
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package Comics::Plugin::Base; |
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=head1 NAME |
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Comics::Plugin::Base -- Base class for Plugins. |
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=head1 SYNOPSIS |
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This base class is only used indirectly via the Fetchers. |
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=head1 DESCRIPTION |
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The Plugin Base class provides tools for Plugins. |
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=cut |
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our $VERSION = "1.00"; |
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=head1 CONSTRUCTOR |
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=head2 register( { ... } ) |
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Registers the plugin to the aggregator. |
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The method takes a hash ref with arguments. What arguments are |
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possible depends on the plugin's Fetcher type. See the documentation |
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of the Fetchers for more info. |
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As of API 1.1, the preferred way of specifying the data is by using |
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package variables. These will be transferred to the hash using |
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introspection. |
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Common arguments are: |
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=over 8 |
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=item name |
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The full name of this comic, e.g. "Fokke en Sukke". |
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=item url |
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The url of this comic's home page. |
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=item tag |
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A short identifier for this comic. This will be automatically provided |
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if not specified. |
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The tag is used to generate file names for images and HTML fragments. |
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=back |
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=cut |
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sub register { |
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my ( $pkg, $init ) = @_; |
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# API 1.0 - change to new naming. |
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$init->{pattern} = delete $init->{pat}; |
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$init->{patterns} = delete $init->{pats}; |
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# API 1.1 - fill %init with package variables. |
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my %stash = do { no strict 'refs'; %{"${pkg}::"} }; |
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# Iterate through the symbol table, which contains glob values |
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# indexed by symbol names. |
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while ( my ( $var, $glob ) = each(%stash) ) { |
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if (defined ${*{$glob}{SCALAR}} ) { |
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# Copy value. |
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$init->{$var} = ${*{$glob}{SCALAR}}; |
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} |
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if ( defined *{$glob}{ARRAY} ) { |
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# Copy ref. |
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$init->{$var} = *{$glob}{ARRAY}; |
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} |
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if ( defined *{$glob}{HASH} ) { |
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# Copy ref. |
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$init->{$var} = *{$glob}{HASH}; |
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} |
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} |
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my $self = { %$init }; |
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bless $self, $pkg; |
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$self->{tag} ||= $self->tag_from_package; |
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return $self; |
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} |
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=head1 METHODS |
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=head2 html |
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Generates an HTML fragment for a fetched image. |
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=cut |
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sub html { |
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my ( $self ) = @_; |
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my $state = $self->{state}; |
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my $w = $state->{c_width}; |
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my $h = $state->{c_height}; |
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if ( $h && $w ) { |
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if ( $w > 1024 ) { |
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$w = 1024; |
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$h = int( $h * $w/$state->{c_width} ); |
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} |
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} |
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my $res = |
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qq{\n} .
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qq{ | } . |
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qq{} . _html($self->{name}) . qq{ \n} . |
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qq{ Last update: } . |
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localtime($state->{update}) . |
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qq{
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qq{ | \n } . |
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qq{
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# Alt and title are extracted from HTML, so they should be |
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# properly escaped. |
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$res .= qq{alt="} . $state->{c_alt} . qq{" } |
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if $state->{c_alt}; |
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$res .= qq{title="} . $state->{c_title} . qq{" } |
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if $state->{c_title}; |
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$res .= qq{width="$w" height="$h" } |
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if $w && $h; |
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$res .= qq{src="$state->{c_img}"> | \n \n \n}; |
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return $res; |
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} |
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sub _html { |
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my ( $t ) = @_; |
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$t =~ s/&/&/g; |
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$t =~ s/</g; |
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$t =~ s/>/>/g; |
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$t =~ s/"/"e;/g; |
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return $t; |
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} |
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=head2 html |
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Generates a tag (identifier) from the name of the plugin. |
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=cut |
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sub tag_from_package { |
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my $self = shift; |
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my $tag = lc(ref($self)); |
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$tag =~ s/^.*:://; |
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return $tag; |
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} |
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1; |