package HTML::Zoom::FilterBuilder;
-use strict;
-use warnings FATAL => 'all';
+use strictures 1;
use base qw(HTML::Zoom::SubObject);
use HTML::Zoom::CodeStream;
shift->_zconfig->stream_utils->flatten_stream_of_streams(@_)
}
+sub set_attr { shift->set_attribute(@_); }
+
sub set_attribute {
my $self = shift;
my ($name, $value) = $self->_parse_attribute_args(@_);
my $self = shift;
# allow ->add_to_attribute(name => 'value')
# or ->add_to_attribute({ name => 'name', value => 'value' })
+
+ die "WARNING: Long form arg (name => 'class', value => 'x') is deprecated"
+ if(@_ == 1 && $_[0]->{'name'} && $_[0]->{'value'});
my ($name, $value) = @_ > 1 ? @_ : @{$_[0]}{qw(name value)};
return ($name, $self->_zconfig->parser->html_escape($value));
}
die "renamed to add_to_attribute. killing this entirely for 1.0";
}
+sub add_class { shift->add_to_attribute('class',@_) }
+
+sub remove_class { shift->remove_attribute('class',@_) }
+
+sub set_class { shift->set_attribute('class',@_) }
+
+sub set_id { shift->set_attribute('id',@_) }
+
sub add_to_attribute {
my $self = shift;
my ($name, $value) = $self->_parse_attribute_args(@_);
};
}
+sub transform_attribute {
+ my $self = shift;
+ my ( $name, $code ) = @_ > 1 ? @_ : @{$_[0]}{qw(name code)};
+
+ sub {
+ my $evt = $_[0];
+ my %a = %{ $evt->{attrs} };
+ my @names = @{ $evt->{attr_names} };
+
+ my $existed_before = exists $a{$name};
+ my $v = $code->( $a{$name} );
+ my $deleted = $existed_before && ! defined $v;
+ my $added = ! $existed_before && defined $v;
+ if( $added ) {
+ push @names, $name;
+ $a{$name} = $v;
+ }
+ elsif( $deleted ) {
+ delete $a{$name};
+ @names = grep $_ ne $name, @names;
+ } else {
+ $a{$name} = $v;
+ }
+ +{ %$evt, raw => undef, raw_attrs => undef,
+ attrs => \%a,
+ ( $deleted || $added
+ ? (attr_names => \@names )
+ : () )
+ }
+ };
+}
+
sub collect {
my ($self, $options) = @_;
my ($into, $passthrough, $content, $filter, $flush_before) =
my $name = $evt->{name};
my $depth = 1;
my $_next = $content ? 'peek' : 'next';
- $stream = do { local $_ = $stream; $filter->($stream) } if $filter;
+ if ($filter) {
+ if ($content) {
+ $stream = do { local $_ = $stream; $filter->($stream) };
+ } else {
+ $stream = do {
+ local $_ = $self->_stream_concat(
+ $self->_stream_from_array($evt),
+ $stream,
+ );
+ $filter->($_);
+ };
+ $evt = $stream->next;
+ }
+ }
my $collector = $self->_stream_from_code(sub {
return unless $stream;
while (my ($evt) = $stream->$_next) {
sub add_before {
my ($self, $events) = @_;
- sub { return $self->_stream_from_array(@$events, $_[0]) };
+ my $coll_proto = $self->collect({ passthrough => 1 });
+ sub {
+ my $emit = $self->_stream_from_proto($events);
+ my $coll = &$coll_proto;
+ if($coll) {
+ if(ref $coll eq 'ARRAY') {
+ my $firstbit = $self->_stream_from_proto([$coll->[0]]);
+ return $self->_stream_concat($emit, $firstbit, $coll->[1]);
+ } elsif(ref $coll eq 'HASH') {
+ return [$emit, $coll];
+ } else {
+ return $self->_stream_concat($emit, $coll);
+ }
+ } else { return $emit }
+ }
}
sub add_after {
my $coll_proto = $self->collect({ passthrough => 1 });
sub {
my ($evt) = @_;
- my $emit = $self->_stream_from_array(@$events);
+ my $emit = $self->_stream_from_proto($events);
my $coll = &$coll_proto;
return ref($coll) eq 'HASH' # single event, no collect
? [ $coll, $emit ]
sub prepend_content {
my ($self, $events) = @_;
+ my $coll_proto = $self->collect({ passthrough => 1, content => 1 });
sub {
my ($evt) = @_;
+ my $emit = $self->_stream_from_proto($events);
if ($evt->{is_in_place_close}) {
$evt = { %$evt }; delete @{$evt}{qw(raw is_in_place_close)};
return [ $evt, $self->_stream_from_array(
- @$events, { type => 'CLOSE', name => $evt->{name} }
+ $emit->next, { type => 'CLOSE', name => $evt->{name} }
) ];
}
- return $self->_stream_from_array($evt, @$events);
+ my $coll = &$coll_proto;
+ return [ $coll->[0], $self->_stream_concat($emit, $coll->[1]) ];
};
}
my $coll_proto = $self->collect({ passthrough => 1, content => 1 });
sub {
my ($evt) = @_;
+ my $emit = $self->_stream_from_proto($events);
if ($evt->{is_in_place_close}) {
$evt = { %$evt }; delete @{$evt}{qw(raw is_in_place_close)};
return [ $evt, $self->_stream_from_array(
- @$events, { type => 'CLOSE', name => $evt->{name} }
+ $emit->next, { type => 'CLOSE', name => $evt->{name} }
) ];
}
my $coll = &$coll_proto;
- my $emit = $self->_stream_from_array(@$events);
return [ $coll->[0], $self->_stream_concat($coll->[1], $emit) ];
};
}
if ($repeat_between) {
$options->{filter} = sub {
$_->select($repeat_between)->collect({ into => \@between })
- };
+ }
}
my $repeater = sub {
my $s = $self->_stream_from_proto($repeat_for);
->select('p')
->set_attribute(class=>'paragraph')
->select('div')
- ->set_attribute(name=>'class', value=>'divider');
-
+ ->set_attribute({class=>'paragraph', name=>'divider'});
Overrides existing values, if such exist. When multiple L</set_attribute>
calls are made against the same or overlapping selection sets, the final
=head2 add_to_attribute
Adds a value to an existing attribute, or creates one if the attribute does not
-yet exist.
+yet exist. You may call this method with either an Array or HashRef of Args.
$html_zoom
->select('p')
- ->set_attribute(class=>'paragraph')
+ ->set_attribute({class => 'paragraph', name => 'test'})
->then
- ->add_to_attribute(name=>'class', value=>'divider');
+ ->add_to_attribute(class=>'divider');
Attributes with more than one value will have a dividing space.
Removes attributes from the original stream or events already added.
+=head2 transform_attribute
+
+Transforms (or creates or deletes) an attribute by running the passed
+coderef on it. If the coderef returns nothing, the attribute is
+removed.
+
+ $html_zoom
+ ->select('a')
+ ->transform_attribute( href => sub {
+ ( my $a = shift ) =~ s/localhost/example.com/;
+ return $a;
+ },
+ );
+
=head2 collect
- TBD
+Collects and extracts results of L<HTML::Zoom/select>. It takes the following
+optional common options as hash reference.
+
+=over
+
+=item into [ARRAY REFERENCE]
+
+Where to save collected events (selected elements).
+
+ $z1->select('#main-content')
+ ->collect({ into => \@body })
+ ->run;
+ $z2->select('#main-content')
+ ->replace(\@body)
+ ->memoize;
+
+=item filter [CODE]
+
+Run filter on collected elements (locally setting $_ to stream, and passing
+stream as an argument to given code reference). Filtered stream would be
+returned.
+
+ $z->select('.outer')
+ ->collect({
+ filter => sub { $_->select('.inner')->replace_content('bar!') },
+ passthrough => 1,
+ })
+
+It can be used to further filter selection. For example
+
+ $z->select('tr')
+ ->collect({
+ filter => sub { $_->select('td') },
+ passthrough => 1,
+ })
+
+is equivalent to (not implemented yet) descendant selector combination, i.e.
+
+ $z->select('tr td')
+
+=item passthrough [BOOLEAN]
+
+Extract copy of elements; the stream is unchanged (it does not remove collected
+elements). For example without 'passthrough'
+
+ HTML::Zoom->from_html('<foo><bar /></foo>')
+ ->select('foo')
+ ->collect({ content => 1 })
+ ->to_html
+
+returns '<foo></foo>', while with C<passthrough> option
+
+ HTML::Zoom->from_html('<foo><bar /></foo>')
+ ->select('foo')
+ ->collect({ content => 1, passthough => 1 })
+ ->to_html
+
+returns '<foo><bar /></foo>'.
+
+=item content [BOOLEAN]
+
+Collect content of the element, and not the element itself.
+
+For example
+
+ HTML::Zoom->from_html('<h1>Title</h1><p>foo</p>')
+ ->select('h1')
+ ->collect
+ ->to_html
+
+would return '<p>foo</p>', while
+
+ HTML::Zoom->from_html('<h1>Title</h1><p>foo</p>')
+ ->select('h1')
+ ->collect({ content => 1 })
+ ->to_html
+
+would return '<h1></h1><p>foo</p>'.
+
+See also L</collect_content>.
+
+=item flush_before [BOOLEAN]
+
+Generate C<flush> event before collecting, to ensure that the HTML generated up
+to selected element being collected is flushed throught to the browser. Usually
+used in L</repeat> or L</repeat_content>.
+
+=back
=head2 collect_content
- TBD
+Collects contents of L<HTML::Zoom/select> result.
+
+ HTML::Zoom->from_file($foo)
+ ->select('#main-content')
+ ->collect_content({ into => \@foo_body })
+ ->run;
+ $z->select('#foo')
+ ->replace_content(\@foo_body)
+ ->memoize;
+
+Equivalent to running L</collect> with C<content> option set.
=head2 add_before
- TBD
+Given a L<HTML::Zoom/select> result, add given content (which might be string,
+array or another L<HTML::Zoom> object) before it.
+
+ $html_zoom
+ ->select('input[name="foo"]')
+ ->add_before(\ '<span class="warning">required field</span>');
=head2 add_after
- TBD
+Like L</add_before>, only after L<HTML::Zoom/select> result.
+
+ $html_zoom
+ ->select('p')
+ ->add_after("\n\n");
+
+You can add zoom events directly
+
+ $html_zoom
+ ->select('p')
+ ->add_after([ { type => 'TEXT', raw => 'O HAI' } ]);
=head2 prepend_content
- TBD
+Similar to add_before, but adds the content to the match.
+
+ HTML::Zoom
+ ->from_html(q[<p>World</p>])
+ ->select('p')
+ ->prepend_content("Hello ")
+ ->to_html
+
+ ## <p>Hello World</p>
+
+Acceptable values are strings, scalar refs and L<HTML::Zoom> objects
=head2 append_content
- TBD
+Similar to add_after, but adds the content to the match.
+
+ HTML::Zoom
+ ->from_html(q[<p>Hello </p>])
+ ->select('p')
+ ->prepend_content("World")
+ ->to_html
+
+ ## <p>Hello World</p>
+
+Acceptable values are strings, scalar refs and L<HTML::Zoom> objects
=head2 replace
- TBD
+Given a L<HTML::Zoom/select> result, replace it with a string, array or another
+L<HTML::Zoom> object. It takes the same optional common options as L</collect>
+(via hash reference).
=head2 replace_content
Given a L<HTML::Zoom/select> result, replace the content with a string, array
or another L<HTML::Zoom> object.
+ $html_zoom
+ ->select('title, #greeting')
+ ->replace_content('Hello world!');
+
=head2 repeat
- TBD
+For a given selection, repeat over transformations, typically for the purposes
+of populating lists. Takes either an array of anonymous subroutines or a zoom-
+able object consisting of transformation.
+
+Example of array reference style (when it doesn't matter that all iterations are
+pre-generated)
+
+ $zoom->select('table')->repeat([
+ map {
+ my $elem = $_;
+ sub {
+ $_->select('td')->replace_content($e);
+ }
+ } @list
+ ]);
+
+Subroutines would be run with $_ localized to result of L<HTML::Zoom/select> (of
+collected elements), and with said result passed as parameter to subroutine.
+
+You might want to use CodeStream when you don't have all elements upfront
+
+ $zoom->select('.contents')->repeat(sub {
+ HTML::Zoom::CodeStream->new({
+ code => sub {
+ while (my $line = $fh->getline) {
+ return sub {
+ $_->select('.lno')->replace_content($fh->input_line_number)
+ ->select('.line')->replace_content($line)
+ }
+ }
+ return
+ },
+ })
+ });
+
+In addition to common options as in L</collect>, it also supports:
+
+=over
+
+=item repeat_between [SELECTOR]
+
+Selects object to be repeated between items. In the case of array this object
+is put between elements, in case of iterator it is put between results of
+subsequent iterations, in the case of streamable it is put between events
+(->to_stream->next).
+
+See documentation for L</repeat_content>
+
+=back
=head2 repeat_content
- TBD
+Given a L<HTML::Zoom/select> result, run provided iterator passing content of
+this result to this iterator. Accepts the same options as L</repeat>.
+
+Equivalent to using C<contents> option with L</repeat>.
+
+ $html_zoom
+ ->select('#list')
+ ->repeat_content(
+ [
+ sub {
+ $_->select('.name')->replace_content('Matt')
+ ->select('.age')->replace_content('26')
+ },
+ sub {
+ $_->select('.name')->replace_content('Mark')
+ ->select('.age')->replace_content('0x29')
+ },
+ sub {
+ $_->select('.name')->replace_content('Epitaph')
+ ->select('.age')->replace_content('<redacted>')
+ },
+ ],
+ { repeat_between => '.between' }
+ );
+
=head1 ALSO SEE
projects / catagits/HTML-Zoom.git / blobdiff