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d80786d0 |
1 | package HTML::Zoom; |
2 | |
3 | use strict; |
4 | use warnings FATAL => 'all'; |
5 | |
6 | use HTML::Zoom::ZConfig; |
7 | use HTML::Zoom::MatchWithoutFilter; |
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8 | use HTML::Zoom::ReadFH; |
655965b3 |
9 | use HTML::Zoom::Transform; |
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10 | |
11 | sub new { |
12 | my ($class, $args) = @_; |
13 | my $new = {}; |
14 | $new->{zconfig} = HTML::Zoom::ZConfig->new($args->{zconfig}||{}); |
15 | bless($new, $class); |
16 | } |
17 | |
18 | sub zconfig { shift->_self_or_new->{zconfig} } |
19 | |
20 | sub _self_or_new { |
21 | ref($_[0]) ? $_[0] : $_[0]->new |
22 | } |
23 | |
24 | sub _with { |
25 | bless({ %{$_[0]}, %{$_[1]} }, ref($_[0])); |
26 | } |
27 | |
28 | sub from_html { |
29 | my $self = shift->_self_or_new; |
30 | $self->_with({ |
31 | initial_events => $self->zconfig->parser->html_to_events($_[0]) |
32 | }); |
33 | } |
34 | |
bf5a23d0 |
35 | sub from_file { |
36 | my $self = shift->_self_or_new; |
37 | my $filename = shift; |
38 | $self->from_html(do { local (@ARGV, $/) = ($filename); <> }); |
39 | } |
40 | |
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41 | sub to_stream { |
42 | my $self = shift; |
43 | die "No events to build from - forgot to call from_html?" |
44 | unless $self->{initial_events}; |
45 | my $sutils = $self->zconfig->stream_utils; |
46 | my $stream = $sutils->stream_from_array(@{$self->{initial_events}}); |
2f0c6a86 |
47 | $stream = $_->apply_to_stream($stream) for @{$self->{transforms}||[]}; |
d80786d0 |
48 | $stream |
49 | } |
50 | |
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51 | sub to_fh { |
52 | HTML::Zoom::ReadFH->from_zoom(shift); |
53 | } |
54 | |
55 | sub run { |
56 | my $self = shift; |
57 | $self->zconfig->stream_utils->stream_to_array($self->to_stream); |
58 | return |
59 | } |
60 | |
61 | sub apply { |
62 | my ($self, $code) = @_; |
63 | local $_ = $self; |
64 | $self->$code; |
65 | } |
66 | |
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67 | sub to_html { |
68 | my $self = shift; |
69 | $self->zconfig->producer->html_from_stream($self->to_stream); |
70 | } |
71 | |
72 | sub memoize { |
73 | my $self = shift; |
74 | ref($self)->new($self)->from_html($self->to_html); |
75 | } |
76 | |
77 | sub with_filter { |
1c4455ae |
78 | my $self = shift->_self_or_new; |
79 | my ($selector, $filter) = @_; |
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80 | $self->_with({ |
2f0c6a86 |
81 | transforms => [ |
82 | @{$self->{transforms}||[]}, |
83 | HTML::Zoom::Transform->new({ |
84 | zconfig => $self->zconfig, |
85 | selector => $selector, |
86 | filters => [ $filter ] |
87 | }) |
88 | ] |
d80786d0 |
89 | }); |
90 | } |
91 | |
92 | sub select { |
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93 | my $self = shift->_self_or_new; |
94 | my ($selector) = @_; |
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95 | return HTML::Zoom::MatchWithoutFilter->construct( |
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96 | $self, $selector, $self->zconfig->filter_builder, |
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97 | ); |
98 | } |
99 | |
100 | # There's a bug waiting to happen here: if you do something like |
101 | # |
102 | # $zoom->select('.foo') |
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103 | # ->remove_attribute(class => 'foo') |
d80786d0 |
104 | # ->then |
105 | # ->well_anything_really |
106 | # |
107 | # the second action won't execute because it doesn't match anymore. |
108 | # Ideally instead we'd merge the match subs but that's more complex to |
109 | # implement so I'm deferring it for the moment. |
110 | |
111 | sub then { |
112 | my $self = shift; |
2f0c6a86 |
113 | die "Can't call ->then without a previous transform" |
114 | unless $self->{transforms}; |
115 | $self->select($self->{transforms}->[-1]->selector); |
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116 | } |
117 | |
118 | 1; |
119 | |
120 | =head1 NAME |
121 | |
122 | HTML::Zoom - selector based streaming template engine |
123 | |
124 | =head1 SYNOPSIS |
125 | |
126 | use HTML::Zoom; |
127 | |
128 | my $template = <<HTML; |
129 | <html> |
130 | <head> |
131 | <title>Hello people</title> |
132 | </head> |
133 | <body> |
134 | <h1 id="greeting">Placeholder</h1> |
135 | <div id="list"> |
136 | <span> |
137 | <p>Name: <span class="name">Bob</span></p> |
138 | <p>Age: <span class="age">23</span></p> |
139 | </span> |
140 | <hr class="between" /> |
141 | </div> |
142 | </body> |
143 | </html> |
144 | HTML |
145 | |
146 | my $output = HTML::Zoom |
147 | ->from_html($template) |
148 | ->select('title, #greeting')->replace_content('Hello world & dog!') |
149 | ->select('#list')->repeat_content( |
150 | [ |
151 | sub { |
152 | $_->select('.name')->replace_content('Matt') |
153 | ->select('.age')->replace_content('26') |
154 | }, |
155 | sub { |
156 | $_->select('.name')->replace_content('Mark') |
157 | ->select('.age')->replace_content('0x29') |
158 | }, |
159 | sub { |
160 | $_->select('.name')->replace_content('Epitaph') |
161 | ->select('.age')->replace_content('<redacted>') |
162 | }, |
163 | ], |
164 | { repeat_between => '.between' } |
165 | ) |
166 | ->to_html; |
167 | |
168 | will produce: |
169 | |
170 | =begin testinfo |
171 | |
172 | my $expect = <<HTML; |
173 | |
174 | =end testinfo |
175 | |
176 | <html> |
177 | <head> |
178 | <title>Hello world & dog!</title> |
179 | </head> |
180 | <body> |
181 | <h1 id="greeting">Hello world & dog!</h1> |
182 | <div id="list"> |
183 | <span> |
184 | <p>Name: <span class="name">Matt</span></p> |
185 | <p>Age: <span class="age">26</span></p> |
186 | </span> |
187 | <hr class="between" /> |
188 | <span> |
189 | <p>Name: <span class="name">Mark</span></p> |
190 | <p>Age: <span class="age">0x29</span></p> |
191 | </span> |
192 | <hr class="between" /> |
193 | <span> |
194 | <p>Name: <span class="name">Epitaph</span></p> |
195 | <p>Age: <span class="age"><redacted></span></p> |
196 | </span> |
197 | |
198 | </div> |
199 | </body> |
200 | </html> |
201 | |
202 | =begin testinfo |
203 | |
204 | HTML |
205 | is($output, $expect, 'Synopsis code works ok'); |
206 | |
207 | =end testinfo |
208 | |
1c4455ae |
209 | =head1 DANGER WILL ROBINSON |
210 | |
211 | This is a 0.9 release. That means that I'm fairly happy the API isn't going |
212 | to change in surprising and upsetting ways before 1.0 and a real compatibility |
213 | freeze. But it also means that if it turns out there's a mistake the size of |
214 | a politician's ego in the API design that I haven't spotted yet there may be |
215 | a bit of breakage between here and 1.0. Hopefully not though. Appendages |
216 | crossed and all that. |
217 | |
218 | Worse still, the rest of the distribution isn't documented yet. I'm sorry. |
219 | I suck. But lots of people have been asking me to ship this, docs or no, so |
220 | having got this class itself at least somewhat documented I figured now was |
221 | a good time to cut a first real release. |
222 | |
223 | =head1 DESCRIPTION |
224 | |
225 | HTML::Zoom is a lazy, stream oriented, streaming capable, mostly functional, |
226 | CSS selector based semantic templating engine for HTML and HTML-like |
227 | document formats. |
228 | |
229 | Which is, on the whole, a bit of a mouthful. So let me step back a moment |
230 | and explain why you care enough to understand what I mean: |
231 | |
232 | =head2 JQUERY ENVY |
233 | |
234 | HTML::Zoom is the cure for JQuery envy. When your javascript guy pushes a |
235 | piece of data into a document by doing: |
236 | |
237 | $('.username').replaceAll(username); |
238 | |
239 | In HTML::Zoom one can write |
240 | |
241 | $zoom->select('.username')->replace_content($username); |
242 | |
243 | which is, I hope, almost as clear, hampered only by the fact that Zoom can't |
244 | assume a global document and therefore has nothing quite so simple as the |
245 | $() function to get the initial selection. |
246 | |
247 | L<HTML::Zoom::SelectorParser> implements a subset of the JQuery selector |
248 | specification, and will continue to track that rather than the W3C standards |
249 | for the forseeable future on grounds of pragmatism. Also on grounds of their |
250 | spec is written in EN_US rather than EN_W3C, and I read the former much better. |
251 | |
252 | I am happy to admit that it's very, very much a subset at the moment - see the |
253 | L<HTML::Zoom::SelectorParser> POD for what's currently there, and expect more |
254 | and more to be supported over time as we need it and patch it in. |
255 | |
256 | =head2 CLEAN TEMPLATES |
257 | |
258 | HTML::Zoom is the cure for messy templates. How many times have you looked at |
259 | templates like this: |
260 | |
261 | <form action="/somewhere"> |
262 | [% FOREACH field IN fields %] |
263 | <label for="[% field.id %]">[% field.label %]</label> |
264 | <input name="[% field.name %]" type="[% field.type %]" value="[% field.value %]" /> |
265 | [% END %] |
266 | </form> |
267 | |
268 | and despaired of the fact that neither the HTML structure nor the logic are |
269 | remotely easy to read? Fortunately, with HTML::Zoom we can separate the two |
270 | cleanly: |
271 | |
272 | <form class="myform" action="/somewhere"> |
273 | <label /> |
274 | <input /> |
275 | </form> |
276 | |
277 | $zoom->select('.myform')->repeat_content([ |
278 | map { my $field = $_; sub { |
279 | |
280 | $_->select('label') |
281 | ->add_attribute( for => $field->{id} ) |
282 | ->then |
283 | ->replace_content( $field->{label} ) |
284 | |
285 | ->select('input') |
286 | ->add_attribute( name => $field->{name} ) |
287 | ->then |
288 | ->add_attribute( type => $field->{type} ) |
289 | ->then |
290 | ->add_attribute( value => $field->{value} ) |
291 | |
292 | } } @fields |
293 | ]); |
294 | |
295 | This is, admittedly, very much not shorter. However, it makes it extremely |
296 | clear what's happening and therefore less hassle to maintain. Especially |
297 | because it allows the designer to fiddle with the HTML without cutting |
298 | himself on sharp ELSE clauses, and the developer to add available data to |
299 | the template without getting angle bracket cuts on sensitive parts. |
300 | |
301 | Better still, HTML::Zoom knows that it's inserting content into HTML and |
302 | can escape it for you - the example template should really have been: |
303 | |
304 | <form action="/somewhere"> |
305 | [% FOREACH field IN fields %] |
306 | <label for="[% field.id | html %]">[% field.label | html %]</label> |
307 | <input name="[% field.name | html %]" type="[% field.type | html %]" value="[% field.value | html %]" /> |
308 | [% END %] |
309 | </form> |
310 | |
311 | and frankly I'll take slightly more code any day over *that* crawling horror. |
312 | |
313 | (addendum: I pick on L<Template Toolkit|Template> here specifically because |
314 | it's the template system I hate the least - for text templating, I don't |
315 | honestly think I'll ever like anything except the next version of Template |
316 | Toolkit better - but HTML isn't text. Zoom knows that. Do you?) |
317 | |
318 | =head2 PUTTING THE FUN INTO FUNCTIONAL |
319 | |
320 | The principle of HTML::Zoom is to provide a reusable, functional container |
321 | object that lets you build up a set of transforms to be applied; every method |
322 | call you make on a zoom object returns a new object, so it's safe to do so |
323 | on one somebody else gave you without worrying about altering state (with |
324 | the notable exception of ->next for stream objects, which I'll come to later). |
325 | |
326 | So: |
327 | |
328 | my $z2 = $z1->select('.name')->replace_content($name); |
329 | |
330 | my $z3 = $z2->select('.title')->replace_content('Ms.'); |
331 | |
332 | each time produces a new Zoom object. If you want to package up a set of |
333 | transforms to re-use, HTML::Zoom provides an 'apply' method: |
334 | |
335 | my $add_name = sub { $_->select('.name')->replace_content($name) }; |
336 | |
337 | my $same_as_z2 = $z1->apply($add_name); |
338 | |
339 | =head2 LAZINESS IS A VIRTUE |
340 | |
341 | HTML::Zoom does its best to defer doing anything until it's absolutely |
342 | required. The only point at which it descends into state is when you force |
343 | it to create a stream, directly by: |
344 | |
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345 | my $stream = $zoom->to_stream; |
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346 | |
347 | while (my $evt = $stream->next) { |
348 | # handle zoom event here |
349 | } |
350 | |
351 | or indirectly via: |
352 | |
353 | my $final_html = $zoom->to_html; |
354 | |
355 | my $fh = $zoom->to_fh; |
356 | |
357 | while (my $chunk = $fh->getline) { |
358 | ... |
359 | } |
360 | |
361 | Better still, the $fh returned doesn't create its stream until the first |
362 | call to getline, which means that until you call that and force it to be |
363 | stateful you can get back to the original stateless Zoom object via: |
364 | |
365 | my $zoom = $fh->to_zoom; |
366 | |
367 | which is exceedingly handy for filtering L<Plack> PSGI responses, among other |
368 | things. |
369 | |
370 | Because HTML::Zoom doesn't try and evaluate everything up front, you can |
371 | generally put things together in whatever order is most appropriate. This |
372 | means that: |
373 | |
374 | my $start = HTML::Zoom->from_html($html); |
375 | |
376 | my $zoom = $start->select('div')->replace_content('THIS IS A DIV!'); |
377 | |
378 | and: |
379 | |
380 | my $start = HTML::Zoom->select('div')->replace_content('THIS IS A DIV!'); |
381 | |
382 | my $zoom = $start->from_html($html); |
383 | |
384 | will produce equivalent final $zoom objects, thus proving that there can be |
385 | more than one way to do it without one of them being a |
386 | L<bait and switch|Switch>. |
387 | |
388 | =head2 STOCKTON TO DARLINGTON UNDER STREAM POWER |
389 | |
390 | HTML::Zoom's execution always happens in terms of streams under the hood |
391 | - that is, the basic pattern for doing anything is - |
392 | |
393 | my $stream = get_stream_from_somewhere |
394 | |
395 | while (my ($evt) = $stream->next) { |
396 | # do something with the event |
397 | } |
398 | |
399 | More importantly, all selectors and filters are also built as stream |
400 | operations, so a selector and filter pair is effectively: |
401 | |
402 | sub next { |
403 | my ($self) = @_; |
404 | my $next_evt = $self->parent_stream->next; |
405 | if ($self->selector_matches($next_evt)) { |
406 | return $self->apply_filter_to($next_evt); |
407 | } else { |
408 | return $next_evt; |
409 | } |
410 | } |
411 | |
412 | Internally, things are marginally more complicated than that, but not enough |
413 | that you as a user should normally need to care. |
414 | |
415 | In fact, an HTML::Zoom object is mostly just a container for the relevant |
416 | information from which to build the final stream that does the real work. A |
417 | stream built from a Zoom object is a stream of events from parsing the |
418 | initial HTML, wrapped in a filter stream per selector/filter pair provided |
419 | as described above. |
420 | |
421 | The upshot of this is that the application of filters works just as well on |
422 | streams as on the original Zoom object - in fact, when you run a |
423 | L</repeat_content> operation your subroutines are applied to the stream for |
424 | that element of the repeat, rather than constructing a new zoom per repeat |
425 | element as well. |
426 | |
427 | More concretely: |
428 | |
429 | $_->select('div')->replace_content('I AM A DIV!'); |
430 | |
431 | works on both HTML::Zoom objects themselves and HTML::Zoom stream objects and |
432 | shares sufficient of the implementation that you can generally forget the |
433 | difference - barring the fact that a stream already has state attached so |
434 | things like to_fh are no longer available. |
435 | |
436 | =head2 POP! GOES THE WEASEL |
437 | |
438 | ... and by Weasel, I mean layout. |
439 | |
440 | HTML::Zoom's filehandle object supports an additional event key, 'flush', |
441 | that is transparent to the rest of the system but indicates to the filehandle |
442 | object to end a getline operation at that point and return the HTML so far. |
443 | |
444 | This means that in an environment where streaming output is available, such |
445 | as a number of the L<Plack> PSGI handlers, you can add the flush key to an |
446 | event in order to ensure that the HTML generated so far is flushed through |
447 | to the browser right now. This can be especially useful if you know you're |
448 | about to call a web service or a potentially slow database query or similar |
449 | to ensure that at least the header/layout of your page renders now, improving |
450 | perceived user responsiveness while your application waits around for the |
451 | data it needs. |
452 | |
453 | This is currently exposed by the 'flush_before' option to the collect filter, |
454 | which incidentally also underlies the replace and repeat filters, so to |
455 | indicate we want this behaviour to happen before a query is executed we can |
456 | write something like: |
457 | |
458 | $zoom->select('.item')->repeat(sub { |
459 | if (my $row = $db_thing->next) { |
460 | return sub { $_->select('.item-name')->replace_content($row->name) } |
461 | } else { |
462 | return |
463 | } |
464 | }, { flush_before => 1 }); |
465 | |
466 | which should have the desired effect given a sufficiently lazy $db_thing (for |
467 | example a L<DBIx::Class::ResultSet> object). |
468 | |
469 | =head2 A FISTFUL OF OBJECTS |
470 | |
471 | At the core of an HTML::Zoom system lurks an L<HTML::Zoom::ZConfig> object, |
472 | whose purpose is to hang on to the various bits and pieces that things need |
473 | so that there's a common way of accessing shared functionality. |
474 | |
475 | Were I a computer scientist I would probably call this an "Inversion of |
476 | Control" object - which you'd be welcome to google to learn more about, or |
477 | you can just imagine a computer scientist being suspended upside down over |
478 | a pit. Either way works for me, I'm a pure maths grad. |
479 | |
480 | The ZConfig object hangs on to one each of the following for you: |
481 | |
482 | =over 4 |
483 | |
484 | =item * An HTML parser, normally L<HTML::Zoom::Parser::BuiltIn> |
485 | |
486 | =item * An HTML producer (emitter), normally L<HTML::Zoom::Producer::BuiltIn> |
487 | |
488 | =item * An object to build event filters, normally L<HTML::Zoom::FilterBuilder> |
489 | |
490 | =item * An object to parse CSS selectors, normally L<HTML::Zoom::SelectorParser> |
491 | |
492 | =item * An object to build streams, normally L<HTML::Zoom::StreamUtils> |
493 | |
494 | =back |
495 | |
496 | In theory you could replace any of these with anything you like, but in |
497 | practice you're probably best restricting yourself to subclasses, or at |
498 | least things that manage to look like the original if you squint a bit. |
499 | |
500 | If you do something more clever than that, or find yourself overriding things |
501 | in your ZConfig a lot, please please tell us about it via one of the means |
502 | mentioned under L</SUPPORT>. |
503 | |
504 | =head2 SEMANTIC DIDACTIC |
505 | |
506 | Some will argue that overloading CSS selectors to do data stuff is a terrible |
507 | idea, and possibly even a step towards the "Concrete Javascript" pattern |
508 | (which I abhor) or Smalltalk's Morphic (which I ignore, except for the part |
509 | where it keeps reminding me of the late, great Tony Hart's plasticine friend). |
510 | |
511 | To which I say, "eh", "meh", and possibly also "feh". If it really upsets |
512 | you, either use extra classes for this (and remove them afterwards) or |
513 | use special fake elements or, well, honestly, just use something different. |
514 | L<Template::Semantic> provides a similar idea to zoom except using XPath |
515 | and XML::LibXML transforms rather than a lightweight streaming approach - |
516 | maybe you'd like that better. Or maybe you really did want |
517 | L<Template Toolkit|Template> after all. It is still damn good at what it does, |
518 | after all. |
519 | |
520 | So far, however, I've found that for new sites the designers I'm working with |
521 | generally want to produce nice semantic HTML with classes that represent the |
522 | nature of the data rather than the structure of the layout, so sharing them |
523 | as a common interface works really well for us. |
524 | |
525 | In the absence of any evidence that overloading CSS selectors has killed |
526 | children or unexpectedly set fire to grandmothers - and given microformats |
527 | have been around for a while there's been plenty of opportunity for |
528 | octagenarian combustion - I'd suggest you give it a try and see if you like it. |
529 | |
530 | =head2 GET THEE TO A SUMMARY! |
531 | |
532 | Erm. Well. |
533 | |
534 | HTML::Zoom is a lazy, stream oriented, streaming capable, mostly functional, |
535 | CSS selector based semantic templating engine for HTML and HTML-like |
536 | document formats. |
537 | |
538 | But I said that already. Although hopefully by now you have some idea what I |
539 | meant when I said it. If you didn't have any idea the first time. I mean, I'm |
540 | not trying to call you stupid or anything. Just saying that maybe it wasn't |
541 | totally obvious without the explanation. Or something. |
542 | |
543 | Er. |
544 | |
545 | Maybe we should just move on to the method docs. |
546 | |
547 | =head1 METHODS |
548 | |
549 | =head2 new |
550 | |
551 | my $zoom = HTML::Zoom->new; |
552 | |
553 | my $zoom = HTML::Zoom->new({ zconfig => $zconfig }); |
554 | |
555 | Create a new empty Zoom object. You can optionally pass an |
556 | L<HTML::Zoom::ZConfig> instance if you're trying to override one or more of |
557 | the default components. |
558 | |
559 | This method isn't often used directly since several other methods can also |
560 | act as constructors, notable L</select> and L</from_html> |
561 | |
562 | =head2 zconfig |
563 | |
564 | my $zconfig = $zoom->zconfig; |
565 | |
566 | Retrieve the L<HTML::Zoom::ZConfig> instance used by this Zoom object. You |
567 | shouldn't usually need to call this yourself. |
568 | |
569 | =head2 from_html |
570 | |
571 | my $zoom = HTML::Zoom->from_html($html); |
572 | |
573 | my $z2 = $z1->from_html($html); |
574 | |
575 | Parses the HTML using the current zconfig's parser object and returns a new |
576 | zoom instance with that as the source HTML to be transformed. |
577 | |
578 | =head2 from_file |
579 | |
580 | my $zoom = HTML::Zoom->from_file($file); |
581 | |
582 | my $z2 = $z1->from_file($file); |
583 | |
584 | Convenience method - slurps the contents of $file and calls from_html with it. |
585 | |
586 | =head2 to_stream |
587 | |
588 | my $stream = $zoom->to_stream; |
589 | |
590 | while (my ($evt) = $stream->next) { |
591 | ... |
592 | |
593 | Creates a stream, starting with a stream of the events from the HTML supplied |
594 | via L</from_html> and then wrapping it in turn with each selector+filter pair |
595 | that have been applied to the zoom object. |
596 | |
597 | =head2 to_fh |
598 | |
599 | my $fh = $zoom->to_fh; |
600 | |
601 | call_something_expecting_a_filehandle($fh); |
602 | |
603 | Returns an L<HTML::Zoom::ReadFH> instance that will create a stream the first |
604 | time its getline method is called and then return all HTML up to the next |
605 | event with 'flush' set. |
606 | |
607 | You can pass this filehandle to compliant PSGI handlers (and probably most |
608 | web frameworks). |
609 | |
610 | =head2 run |
611 | |
612 | $zoom->run; |
613 | |
614 | Runs the zoom object's transforms without doing anything with the results. |
615 | |
616 | Normally used to get side effects of a zoom run - for example when using |
617 | L<HTML::Zoom::FilterBuilder/collect> to slurp events for scraping or layout. |
618 | |
619 | =head2 apply |
620 | |
621 | my $z2 = $z1->apply(sub { |
622 | $_->select('div')->replace_content('I AM A DIV!') }) |
623 | }); |
624 | |
625 | Sets $_ to the zoom object and then runs the provided code. Basically syntax |
626 | sugar, the following is entirely equivalent: |
627 | |
628 | my $sub = sub { |
629 | shift->select('div')->replace_content('I AM A DIV!') }) |
630 | }; |
631 | |
632 | my $z2 = $sub->($z1); |
633 | |
634 | =head2 to_html |
635 | |
636 | my $html = $zoom->to_html; |
637 | |
638 | Runs the zoom processing and returns the resulting HTML. |
639 | |
640 | =head2 memoize |
641 | |
642 | my $z2 = $z1->memoize; |
643 | |
644 | Creates a new zoom whose source HTML is the results of the original zoom's |
645 | processing. Effectively syntax sugar for: |
646 | |
647 | my $z2 = HTML::Zoom->from_html($z1->to_html); |
648 | |
649 | but preserves your L<HTML::Zoom::ZConfig> object. |
650 | |
651 | =head2 with_filter |
652 | |
653 | my $zoom = HTML::Zoom->with_filter( |
654 | 'div', $filter_builder->replace_content('I AM A DIV!') |
655 | ); |
656 | |
657 | my $z2 = $z1->with_filter( |
658 | 'div', $filter_builder->replace_content('I AM A DIV!') |
659 | ); |
660 | |
661 | Lower level interface than L</select> to adding filters to your zoom object. |
662 | |
663 | In normal usage, you probably don't need to call this yourself. |
664 | |
665 | =head2 select |
666 | |
667 | my $zoom = HTML::Zoom->select('div')->replace_content('I AM A DIV!'); |
668 | |
669 | my $z2 = $z1->select('div')->replace_content('I AM A DIV!'); |
670 | |
671 | Returns an intermediary object of the class L<HTML::Zoom::MatchWithoutFilter> |
672 | on which methods of your L<HTML::Zoom::FilterBuilder> object can be called. |
673 | |
674 | In normal usage you should generally always put the pair of method calls |
675 | together; the intermediary object isn't designed or expected to stick around. |
676 | |
677 | =head2 then |
678 | |
679 | my $z2 = $z1->select('div')->add_attribute(class => 'spoon') |
680 | ->then |
681 | ->replace_content('I AM A DIV!'); |
682 | |
683 | Re-runs the previous select to allow you to chain actions together on the |
684 | same selector. |
685 | |
d80786d0 |
686 | =cut |