in reply to Re: Some issues with WWW::Mechanize::Firefox->xpath() method (xpath 1.0)
in thread Some issues with WWW::Mechanize::Firefox->xpath() method

Works for me (using XML::XSH2): 
$ xsh
$scratch/> insert element p into /scratch
$scratch/> insert text 'Hello world' into /scratch/p
$scratch/> echo substring(//p,1,4)
Hell

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Re^3: Some issues with WWW::Mechanize::Firefox->xpath() method (xpath 1.0)
by Anonymous Monk on Apr 02, 2013 at 10:42 UTC

    Works for me (using XML::XSH2):

    And you're sure that's not an xsh2 function/feature?

    Produces no output for me 

    #!/usr/bin/perl --
use strict; use warnings; use XML::LibXML;

my $html = <<'__HTML__';
<html>
<head>
<title>Hello Firefox!</title>
</head>
<body>
<h1>Hello <b>World</b>!</h1>
<p id='paragraph'>Hello <b>WWW::Mechanize::Firefox</b> Goob bye</p>
</body>
</html>
__HTML__

my $dom = XML::LibXML->new(
    qw/ recover 2 /
)->load_html(
#~     string => \$html, ## BUG! scalar... not like load_xml
    string => $html,
);

local $\ = $/;

print for $dom->findnodes(q{ substring(//p,1,4) }); ## nada
print for $dom->findnodes(q{ //p }); ## paragraph

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[d/l]
      You are using findnodes, but there is no node corresponding to the substring. Use find instead: 
      print for $dom->find(q{ substring(//p,1,4) });

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[reply]
[d/l]
[select]

        For reference, WWW::Mechanize::Firefox uses document.evaluate() to execute an XPath query. I don't know how it relates to ->findNodes and ->find, but the return value will always be DOM nodes.

        Javascript in MozRepl::RemoteObject:

        ...
var xres = doc.evaluate(q,ref,null,XPathResult.ORDERED_NODE_SNAPSHOT_T
+YPE, null );
...

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[reply]
[d/l]
[select]

        You are using findnodes, but there is no node corresponding to the substring. Use find instead:

        Well that certainly works :) but the explanation doesn't make sense to me -- what is a text literal if not a text node?

        This whole time I've been thinking the two functions were interchangeable, if findnodes can't deal with this, it should reject the xpath, not do nothing, but yeah, I'm confused

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