8 |
use Carp qw/verbose/; |
use Carp qw/verbose/; |
9 |
use Module::Pluggable search_path => 'Grep::Source', sub_name => 'sources', require => 1; |
use Module::Pluggable search_path => 'Grep::Source', sub_name => 'sources', require => 1; |
10 |
use base qw(Class::Accessor Jifty::Object); |
use base qw(Class::Accessor Jifty::Object); |
11 |
Grep::Source->mk_accessors( qw(feed uri q new_items collection) ); |
Grep::Source->mk_accessors( qw(feed uri q new_items collection search_obj tree) ); |
12 |
|
|
13 |
use HTML::TreeBuilder; |
use HTML::TreeBuilder; |
14 |
use WWW::Mechanize; |
use WWW::Mechanize; |
108 |
my $class = $self->feed->source || 'Grep::Source::Feed'; |
my $class = $self->feed->source || 'Grep::Source::Feed'; |
109 |
$self->log->debug("using $class"); |
$self->log->debug("using $class"); |
110 |
|
|
111 |
my $parent = $self; |
$self->search_obj( Grep::Search->new() ); |
112 |
$class->fetch( $parent ); |
$self->log->debug("created " . $self->search_obj); |
|
undef $parent; |
|
113 |
|
|
114 |
Grep::Search->finish if $self->new_items; |
$class->fetch( $self ); |
115 |
|
|
116 |
|
$self->search_obj->finish; |
117 |
|
|
118 |
return $self->collection; |
return $self->collection; |
119 |
} |
} |
132 |
sub add_record { |
sub add_record { |
133 |
my $self = shift; |
my $self = shift; |
134 |
|
|
135 |
|
$self->log->confess("no search_obj") unless ($self->search_obj); |
136 |
|
|
137 |
my $i = Grep::Model::Item->new(); |
my $i = Grep::Model::Item->new(); |
138 |
|
|
139 |
my $rec = {@_}; |
my $rec = {@_}; |
152 |
|
|
153 |
# is new record? |
# is new record? |
154 |
if ( $msg !~ m/^Found/ ) { |
if ( $msg !~ m/^Found/ ) { |
155 |
Grep::Search->add( $i ); |
$self->search_obj->add( $i ); |
156 |
$self->new_items( ( $self->new_items || 0 ) + 1 ); |
$self->new_items( ( $self->new_items || 0 ) + 1 ); |
157 |
} |
} |
158 |
} else { |
} else { |
188 |
} |
} |
189 |
} |
} |
190 |
|
|
191 |
|
|
192 |
|
=head2 element_by_triplet |
193 |
|
|
194 |
|
Helper method to select element(s) using C<element/attribute/value> triplet using |
195 |
|
L<HTML::TreeBuilder> trees. |
196 |
|
|
197 |
|
my $el = $self->element_by_triplet( |
198 |
|
tree => $tree_or_element, |
199 |
|
triplets => [ qw/ |
200 |
|
div id target |
201 |
|
div class another |
202 |
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/ ], |
203 |
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message => 'find search result element', |
204 |
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fatal => 1, # die instead of warn |
205 |
|
); |
206 |
|
|
207 |
|
=cut |
208 |
|
|
209 |
|
sub element_by_triplet { |
210 |
|
my $self = shift; |
211 |
|
|
212 |
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my $args = {@_}; |
213 |
|
|
214 |
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my $tree = $args->{tree} || die "no tree"; |
215 |
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my $message = $args->{message} || ''; |
216 |
|
my $fatal = $args->{fatal}; |
217 |
|
die "no triplets" unless defined( $args->{triplets} ); |
218 |
|
my @triplets; |
219 |
|
if ( ref( $args->{triplets} ) eq 'ARRAY' ) { |
220 |
|
@triplets = @{ $args->{triplets} }; |
221 |
|
} else { |
222 |
|
@triplets = ( $args->{triplets} ); |
223 |
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} |
224 |
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|
225 |
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push @triplets, ( undef, undef ) if ( $#triplets == 0 ); |
226 |
|
|
227 |
|
die "triplet doesn't have 3 elements but ", $#triplets unless ( |
228 |
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( $#triplets + 1 ) % 3 == 0 |
229 |
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); |
230 |
|
|
231 |
|
my ( $el, $attr, $value ); |
232 |
|
|
233 |
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my @results; |
234 |
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my @tags; |
235 |
|
|
236 |
|
while ( @triplets ) { |
237 |
|
( $el,$attr,$value ) = splice( @triplets, 0, 3 ); |
238 |
|
my $tag = $attr ? "<$el $attr=\"$value\">" : "<$el>"; |
239 |
|
push @tags, $tag; |
240 |
|
$self->log->debug("looking for $message $tag"); |
241 |
|
@results = $tree->look_down( '_tag', $el, sub { |
242 |
|
return 1 unless ( $attr && $value ); |
243 |
|
( $_[0]->attr( $attr ) || '' ) eq $value; |
244 |
|
}); |
245 |
|
last if @results; |
246 |
|
} |
247 |
|
|
248 |
|
if ( ! @results ) { |
249 |
|
my $msg = "can't find $message ", join(" ", @tags); |
250 |
|
die $msg if ( $fatal ); |
251 |
|
warn $msg; |
252 |
|
return; |
253 |
|
} |
254 |
|
|
255 |
|
$self->log->debug("found ", $#results + 1, " results"); |
256 |
|
|
257 |
|
return @results if wantarray; |
258 |
|
return shift @results; |
259 |
|
} |
260 |
|
|
261 |
=head2 scrape |
=head2 scrape |
262 |
|
|
263 |
Create semi-complex L<WWW::Mechanize> rules to scrape page |
Create semi-complex L<WWW::Mechanize> rules to scrape page easily |
264 |
|
|
265 |
|
$parent->scrape( |
266 |
|
# if search string isn't part or URI |
267 |
|
submit_form => { |
268 |
|
fields => { |
269 |
|
value => $parent->q, |
270 |
|
}, |
271 |
|
button => 'fullsearch', |
272 |
|
}, |
273 |
|
# element with search results |
274 |
|
wrapper => [ qw/div class searchresults/ ], |
275 |
|
# element (or tripple) for each result with link |
276 |
|
# <a href=".."> inside it to full-text result |
277 |
|
results => 'dt', |
278 |
|
# collect which element on page linked from results |
279 |
|
scrape => [ qw/div id page/ ], |
280 |
|
# when search returns just single hit, it will redirect to result page |
281 |
|
redirect_single_result => 1, |
282 |
|
); |
283 |
|
|
284 |
=cut |
=cut |
285 |
|
|
320 |
my $tree = HTML::TreeBuilder->new or die "can't create html tree"; |
my $tree = HTML::TreeBuilder->new or die "can't create html tree"; |
321 |
$tree->parse( $mech->content ) or die "can't parse fetched content"; |
$tree->parse( $mech->content ) or die "can't parse fetched content"; |
322 |
|
|
323 |
die "wrapper doesn't have 3 elements but ", $#{ $args->{wrapper} } unless ( $#{ $args->{wrapper} } == 2 ); |
my $div = $self->element_by_triplet( |
324 |
my ( $el,$attr,$value ) = @{ $args->{wrapper} }; |
tree => $tree, |
325 |
|
triplets => $args->{wrapper}, |
326 |
|
message => 'wrapper for all results', |
327 |
|
fatal => $args->{redirect_single_result} ? 0 : 1, |
328 |
|
); |
329 |
|
|
330 |
|
my $max = 15; |
331 |
|
my $nr = 1; |
332 |
|
|
333 |
|
my $base_uri = $uri; |
334 |
|
$base_uri =~ s!\?.*$!!; |
335 |
|
|
336 |
|
# directly got first result |
337 |
|
if ( $args->{redirect_single_result} && ! $div ) { |
338 |
|
|
339 |
$self->log->debug("looking for <$el $attr=\"$value\">"); |
my $uri = $mech->uri; $uri->query( undef ); $uri = $uri->canonical; |
340 |
|
|
341 |
my $div = $tree->look_down( '_tag', $el, sub { |
$div = $self->element_by_triplet( |
342 |
( $_[0]->attr( $attr ) || '' ) eq $value; |
tree => $tree, |
343 |
}); |
message => "single result - redirect to $uri", |
344 |
|
triplets => $args->{scrape}, |
345 |
|
fatal => 1, |
346 |
|
); |
347 |
|
|
348 |
|
$self->add_record( |
349 |
|
in_feed => $feed, |
350 |
|
title => $mech->title, |
351 |
|
link => $uri, |
352 |
|
content => $div->as_HTML, |
353 |
|
); |
354 |
|
|
355 |
if ( ! $div ) { |
$tree->delete; # clear memory! |
|
warn "can't find results wrapper <$el $attr=\"$value\">"; |
|
356 |
return; |
return; |
357 |
} |
} |
358 |
|
|
359 |
my $max = 5; |
my @r = $self->element_by_triplet( |
360 |
my $nr = 1; |
tree => $div, |
361 |
|
triplets => $args->{results}, |
362 |
my $base_uri = $uri; |
message => 'result element', |
363 |
$base_uri =~ s!\?.*$!!; |
); |
364 |
|
|
365 |
foreach my $dt ( $div->look_down( '_tag', $args->{results} ) ) { |
foreach my $dt ( @r ) { |
366 |
my $a = $dt->look_down( '_tag', 'a', sub { $_[0]->attr('href') } ); |
my $a = $dt->look_down( '_tag', 'a', sub { $_[0]->attr('href') } ); |
367 |
if ( $a ) { |
if ( $a ) { |
368 |
|
|
369 |
my $href = $a->attr('href') or die "can't find href inside <", $args->{results}, ">"; |
my $href = $a->attr('href') or die "can't find href inside <", $args->{results}, ">"; |
370 |
my $page_uri = URI->new_abs( $a->attr('href'), $base_uri ); |
|
371 |
|
my $page_uri = URI->new_abs( $href, $base_uri ); |
372 |
$page_uri->query( undef ); |
$page_uri->query( undef ); |
373 |
$page_uri = $page_uri->canonical; |
$page_uri = $page_uri->canonical; |
374 |
|
|
375 |
$self->log->debug("fetching page: ",$a->as_text," from $page_uri"); |
$self->log->debug("fetching page: ",$a->as_text," from $page_uri"); |
376 |
if ( $mech->follow_link( url => $a->attr('href') ) ) { |
if ( $mech->follow_link( url => $href ) ) { |
377 |
|
|
378 |
$self->save( "page-${nr}.html", $mech->content ); |
$self->save( "page-${nr}.html", $mech->content ); |
379 |
|
|
380 |
my $page_tree = HTML::TreeBuilder->new or die "can't create page tree"; |
my $page_tree = HTML::TreeBuilder->new or die "can't create page tree"; |
381 |
$page_tree->parse( $mech->content ) or die "can't parse page at $page_uri"; |
$page_tree->parse( $mech->content ) or die "can't parse page at $page_uri"; |
382 |
|
$div = $self->element_by_triplet( |
383 |
( $el,$attr,$value ) = @{ $args->{scrape} }; |
tree => $page_tree, |
384 |
$div = $page_tree->look_down( '_tag', $el, sub { ( $_[0]->attr( $attr ) || '' ) eq $value } ); |
message => "result $nr", |
385 |
|
triplets => $args->{scrape} |
386 |
die "can't find <$el $attr=\"$value\">" unless ($div); |
); |
387 |
|
|
388 |
$self->add_record( |
$self->add_record( |
389 |
in_feed => $feed, |
in_feed => $feed, |
395 |
# author => |
# author => |
396 |
# issued => |
# issued => |
397 |
# modified => |
# modified => |
398 |
); |
) if ( $div ); |
399 |
|
|
400 |
$mech->back; |
$mech->back; |
401 |
$page_tree->delete; |
$page_tree->delete; |
403 |
} else { |
} else { |
404 |
warn "can't follow uri $page_uri: $!\n"; |
warn "can't follow uri $page_uri: $!\n"; |
405 |
} |
} |
406 |
|
} else { |
407 |
|
$self->log->debug("result $nr doesn't have link inside, ignoring..."); |
408 |
} |
} |
409 |
|
|
410 |
last if ($nr == $max); |
last if ($nr == $max); |