--- lib/Grep/Source.pm	2007/02/23 17:16:33	74
+++ lib/Grep/Source.pm	2007/04/28 13:08:50	121
@@ -7,8 +7,14 @@
 
 use Carp qw/verbose/;
 use Module::Pluggable search_path => 'Grep::Source', sub_name => 'sources', require => 1;
-use base qw(Class::Accessor);
-Grep::Source->mk_accessors( qw(feed uri q new_items collection) );
+use base qw(Class::Accessor Jifty::Object);
+Grep::Source->mk_accessors( qw(feed uri q new_items collection search_obj tree) );
+
+use HTML::TreeBuilder;
+use WWW::Mechanize;
+use XML::Feed;
+use URI;
+use HTML::ResolveLink;
 
 use Data::Dump qw/dump/;
 
@@ -95,16 +101,19 @@
 
 	$self->uri( $uri );
 
-	Jifty->log->info( $message );
+	$self->log->info( $message );
 
 	$self->collection( Grep::Model::ItemCollection->new() );
 
 	my $class = $self->feed->source || 'Grep::Source::Feed';
-	Jifty->log->debug("using $class");
+	$self->log->debug("using $class");
+
+	$self->search_obj( Grep::Search->new() );
+	$self->log->debug("created " . $self->search_obj);
 
 	$class->fetch( $self );
 
-	Grep::Search->finish if $self->new_items;
+	$self->search_obj->finish;
 
 	return $self->collection;
 }
@@ -123,19 +132,27 @@
 sub add_record {
 	my $self = shift;
 
+	$self->log->confess("no search_obj") unless ($self->search_obj);
+
 	my $i = Grep::Model::Item->new();
 
-	my ($ok,$msg) = $i->load_or_create( @_ );
+	my $rec = {@_};
+
+	$self->log->debug("resolving links using base ", $rec->{link});
+	my $resolver = HTML::ResolveLink->new( base => $rec->{link} );
+	$rec->{content} = $resolver->resolve( $rec->{content} );
+
+	my ($ok,$msg) = $i->load_or_create( %$rec );
 
 	$msg ||= '';
 
 	if ( $ok ) {
-		Jifty->log->debug("item ", $i->id, ": $msg");
+		$self->log->debug("item ", $i->id, ": $msg");
 		$self->collection->add_record( $i );
 
 		# is new record?
 		if ( $msg !~ m/^Found/ ) {
-			Grep::Search->add( $i );
+			$self->search_obj->add( $i );
 			$self->new_items( ( $self->new_items || 0 ) + 1 );
 		}
 	} else {
@@ -157,11 +174,195 @@
 	my $content = shift or die "no content?";
 
 	foreach my $s ( $self->sources ) {
-		Jifty->log->debug("testing source class $s");
-		if ($s->can('content_have') && $s->content_have( $content ) ) {
-			Jifty->log->debug("${s}->content_have succesful");
-			return "$s";
+		$self->log->debug("testing source class $s");
+		if ( $s->can('content_have') ) {
+			my $regex =	$s->content_have( $content ) or
+				die "${s}->content_have didn't return anything";
+			die "${s}->content_have didn't return regex but ", dump( $regex ), " ref ", ref( $regex )
+				unless ( ref($regex) eq 'Regexp' );
+			if ( $content =~ $regex ) {
+				$self->log->debug("${s}->content_have succesful");
+				return $s;
+			}
+		}
+	}
+}
+
+=head2 scrape
+
+Create semi-complex L<WWW::Mechanize> rules to scrape page
+
+
+=cut
+
+sub element_by_triplet {
+	my $self = shift;
+
+	my $args = {@_};
+
+	my $tree = $args->{tree} || die "no tree";
+	my $message = $args->{message};
+	my $fatal = $args->{fatal};
+	die "no templates" unless defined( $args->{templates} );
+	my @templates = @{ $args->{templates} };
+
+	push @templates, ( undef, undef ) if ( $#templates == 0 );
+
+	die "wrapper doesn't have 3 elements but ", $#templates unless (
+		( $#templates + 1 ) % 3 == 0
+	);
+
+	my ( $result, $el, $attr, $value );
+
+	my @tags;
+
+	while ( @templates ) {
+		( $el,$attr,$value ) = splice( @templates, 0, 3 );
+		my $tag = $attr ? "<$el $attr=\"$value\">" : "<$el>";
+		push @tags, $tag;
+		$self->log->debug("looking for $message $tag");
+		$result = $tree->look_down( '_tag', $el, sub {
+				return 1 unless ( $attr && $value );
+				( $_[0]->attr( $attr ) || '' ) eq $value;
+		});
+		last if $result;
+	}
+
+	if ( ! $result ) {
+		my $msg = "can't find $message ", join(" ", @tags);
+		die $msg if ( $fatal );
+		warn $msg;
+		return;
+	}
+
+	return $result;
+}
+
+sub scrape {
+	my $self = shift;
+
+	my $args = {@_};
+
+	$self->log->debug("scrape with args ",dump($args));
+
+	my ($feed,$uri,$q) = ($self->feed, $self->uri,$self->q);
+	die "no uri" unless ($uri);
+	die "feed is not a Grep::Model::Feed but ", ref $feed unless $feed->isa('Grep::Model::Feed');
+
+	sub mech_warn {
+		my $m = shift || return;
+		warn $m;
+	}
+
+	my $mech = WWW::Mechanize->new(
+		cookie_jar => {},
+		onwarn => \&mech_warn,
+		onerror => \&mech_warn,
+	);
+
+	$mech->get( $uri );
+
+	$self->save( 'get.html', $mech->content );
+
+	if ( my $form = $args->{submit_form} ) {
+		$self->log->debug("submit form on $uri with ", dump( $form ));
+		$mech->submit_form( %$form ) or die "can't submit form ", dump( $form );
+		$self->save( 'submit.html', $mech->content );
+	}
+
+	$self->log->debug("parse result page");
+
+	my $tree = HTML::TreeBuilder->new or die "can't create html tree";
+	$tree->parse( $mech->content ) or die "can't parse fetched content";
+
+	my $div = $self->element_by_triplet(
+		tree => $tree,
+		templates => $args->{wrapper},
+		message => 'wrapper for all results',
+		fatal => 1
+	);
+
+	my $max = 15;
+	my $nr = 1;
+
+	my $base_uri = $uri;
+	$base_uri =~ s!\?.*$!!;
+
+	my @r = $self->element_by_triplet(
+		tree => $tree,
+		templates => $args->{results},
+		message => 'result element',
+	);
+
+	foreach my $dt ( @r ) {
+		my $a = $dt->look_down( '_tag', 'a', sub { $_[0]->attr('href') } );
+		if ( $a ) {
+
+			my $href = $a->attr('href') or die "can't find href inside <", $args->{results}, ">";
+			my $page_uri = URI->new_abs( $a->attr('href'), $base_uri );
+			$page_uri->query( undef );
+			$page_uri = $page_uri->canonical;
+
+			$self->log->debug("fetching page: ",$a->as_text," from $page_uri");
+			if ( $mech->follow_link( url => $a->attr('href') ) ) {
+
+				$self->save( "page-${nr}.html", $mech->content );
+
+				my $page_tree = HTML::TreeBuilder->new or die "can't create page tree";
+				$page_tree->parse( $mech->content ) or die "can't parse page at $page_uri";
+				$div = $self->element_by_triplet(
+					tree => $page_tree,
+					message => "result $nr",
+					templates => $args->{scrape}
+				);
+
+				$self->add_record(
+					in_feed => $feed,
+					title => $mech->title,
+					link => $page_uri,
+					content => $div->as_HTML,
+#					summary => 
+#					category => 
+#					author => 
+#					issued => 
+#					modified => 
+				) if ( $div );
+
+				$mech->back;
+				$page_tree->delete;
+
+			} else {
+				warn "can't follow uri $page_uri: $!\n";
+			}
+		} else {
+			$self->log->debug("result $nr doesn't have link inside, ignoring...");
 		}
+
+		last if ($nr == $max);
+		$nr++;
+	}
+
+	$tree->delete; # clear memory!
+
+}
+
+=head2 save
+
+  save( 'name', $content );
+
+Save dumps into C</tmp/grep> if writable
+
+=cut
+
+sub save {
+	my $self = shift;
+	my ( $file, $content ) = @_;
+	return unless ( defined($file) && defined($content) );
+	if ( -w '/tmp/grep' ) {
+		open(my $f, '>', "/tmp/grep/$file") or die "can't open $file: $!";
+		print $f $content or die "can't write to $file: $!";
+		close $f or die "can't close $file: $!";
+		$self->log->debug("saved $file ",length($content)," bytes");
 	}
 }