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Re: Help with xpath and TreeBuilder

by Gangabass (Vicar)
on Jun 29, 2012 at 11:04 UTC ( [id://979098]=note: print w/replies, xml ) Need Help??


in reply to Help with xpath and TreeBuilder

It's really easy:

#!/usr/bin/perl

use Modern::Perl;
use HTML::TreeBuilder::XPath;
use Data::Dumper;

local $/;
my $html = <DATA>;
my $tree = HTML::TreeBuilder::XPath->new_from_content($html);

my @values = $tree->findvalues('/html/body/p/a');

say Dumper(@values);

__DATA__
<html>
<body>
<p><a href="1.html">Link Text 1</a></p>
<p><a href="2.html">Link Text 2</a></p>
<p><a href="3.html">Link Text 3</a></p>
<p><a href="4.html">Link Text 4</a></p>
</body>
</html>

[download]

Replies are listed 'Best First'.
Re^2: Help with xpath and TreeBuilder
by Anonymous Monk on Jun 29, 2012 at 12:09 UTC

    Its even easier :) 

    my @xpaths = qw{
/html/body/p/a
/html/body/p[2]/a 
/html/body/p[3]/a
....
/html/body/p[66]/a
};
my $allXpaths = join ' | ', @xpaths;
my @values = $tree->findvalues;

    [download]

    I don't know about other xpath interpreters, but treebuilder::xpath (and xsh ) allows this

    This query is probably faster 

    /html/body/p[
position()=1
or  position()=2
or  position()=3
or  position()=66
]/a

    [download]

    Or this one 

    /html/body/p[
(
  (
    position() > 0
    and position() < 4
  )
  or
  (
    position()=66
  )
)
]/a

    [download]

    Though this one won't work with your html  //a[ position()=4] because each //a is at  //a[ position() = 1] because each //a is the only (first) child of its parent ( p ) --- I guess now I know how position() works

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