2

我试图从一个结构完美的网页中提取相当多的数据，并在Mojo::DOM方法上苦苦挣扎。如果有人能指出我正确的方向，我将不胜感激。

带有有趣数据的截断 HTML 如下：

 <div class="post" data-story-id="3964117" data-visited="false">//extracting story-id
  <h2 class="post_title page_title"><a href="http://example.com/story/some_url" class="to-comments">header.</a></h2>
  //useless data and tags

<a href="http://example.com/story/some_url" class="b-story__show-all">
  <span>useless data</span>
</a>

<div class="post_tags">
  <ul>
    <li class="post_tag post_tag_strawberry hidden"><a href="http://example.com/search.php?n=32&r=3">&nbsp;</a></li>
    <li class="post_tag"><a href="http://example.com/tag/tag1/hot">tag1</a></li>
    <li class="post_tag"><a href="http://example.com/tag/tag2/hot">tag2</a></li>
    <li class="post_tag"><a href="http://example.com/tag/tag1/hot">tag3</a></li>
  </ul>
</div>

<div class="post_actions_box">

  <div class="post_rating_box">
    <ul data-story-id="3964117" data-vote="0" data-can-vote="true">
      <li><span class="post_rating post_rating_up control">&nbsp;</span></li>
      <li><span class="post_rating_count control label">1956</span></li> //1956 - interesting value
      <li><span class="post_rating post_rating_down control">&nbsp;</span></li>
    </ul>
  </div>

  <div class="post_more_box">
    <ul>
      <li>
        <span class="post_more control">&nbsp;</span>
      </li>
      <li>
        <a class="post_comments_count label to-comments" href="http://example.com/story/some_url#comments">132&nbsp;<i>&nbsp;</i></a>
      </li>
    </ul>
  </div>

</div>
</div>

我现在拥有的是

use strict;
use warnings;

use Data::Dumper;
use Mojo::DOM;


my $file = "index2.html";
local( $/, *FH ) ;
open( FH, $file ) or die "sudden flaming death\n";
my $text = <FH>;
my $dom = Mojo::DOM->new;
$dom->parse($text);
my $ids = $dom->find('div.post')
    ->each (sub {print $_->attr('data-story-id'), "\n";});
$dom->find('a.to-comments')->each (sub {print $_->text, "\n";});

这种混乱data-story-id从 src 和标头值中提取（与 href 值测试相同），但我所有其他尝试都失败了。

3964117
Header
132

未提取“post_rating_count 控制标签”。我可以通过搜索a.to-comments和返回获得第一个 href 值attr('href')，但由于某种原因，它也会返回我在段末尾的链接值class="post_comments_count label to-comments"。标题值提取也是如此。

最后，我正在寻找一个具有以下字段的数据结构的数组：

  • 故事ID（这是成功的）
  • href （不知何故，匹配比需要的更多。）
  • 标头（不知何故，匹配超出了需要。）
  • 字符串形式的标签列表（不知道怎么做）

更何况，我觉得可以优化代码，让它看起来更好一点，但我的功夫没有那么强。

4

1 回答 1

3

Your HTML is malformed as I said in my comment. I've guessed where the missing <div> might go but I'm probably wrong. I've assumed the last </div> in the data corresponds to the first <div>, so that the whole block constitutes a single post

The main problem you have is trying to do everything inside an each method call on your Mojo::Collection objects. It's far easier to use Perl to iterate of each collection, like this

use strict;
use warnings;

use Mojo::DOM;

use constant HTML_FILE => 'index2.html';

my $html = do {
    open my $fh, '<', HTML_FILE or die $!;
    local $/;
    <$fh>;
};

my $dom = Mojo::DOM->new($html);

for my $post ( $dom->find('div.post')->each ) {

    printf "Post ID:     %s\n", $post->attr('data-story-id');

    my $anchor = $post->at('h2.post_title > a');
    printf "Post href:   %s\n", $anchor->attr('href');
    printf "Post header: %s\n", $anchor->text;

    my @tags = $post->find('li.post_tag > a')->map('text')->each;

    printf "Tags:        %s\n", join ', ', @tags;

    print "\n";
}

output

Post ID:     3964117
Post href:   http://example.com/story/some_url
Post header: Header
Tags:        some_value, tag1, tag2, tag3
于 2016-02-03T09:42:55.467 回答