Re^3: language selection via libxml

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Re^4: language selection via libxml by tangent (Parson) on Jan 20, 2014 at 12:41 UTC
With the quotes I get `Scalar found where operator expected near ""/language/$language/widget +[\@ID="$id" String found where operator expected near "$id"]"" syntax error near ""/language/$language/widget[\@ID="$id"` [download] Update: Perhaps I should have said "lose double quotes around $id", though no quotes works for me too: `"/language/$language/widget[\@ID="$id"]" - Error "/language/$language/widget[\@ID='$id']" - OK "/language/$language/widget[\@ID=$id]" - OK` [download]	[reply] [d/l] [select]
Re^5: language selection via libxml by choroba (Cardinal) on Jan 20, 2014 at 13:09 UTC
`"/language/$language/widget[\@ID=$id]" - OK` [download] Well, it is a valid syntax, but the meaning is different: it tries to find a widget whose ID attribute has the same value as the text of the child of `widget` whose name is $id. Barewords are not promoted to strings in XPath. لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply] [d/l] [select]
Re^6: language selection via libxml by tangent (Parson) on Jan 20, 2014 at 13:21 UTC
I am trying to get this as I believe Xpath expressions to be very powerful and I've always had a hard time understanding them. The two examples marked OK above seem to behave the same way: use XML::LibXML; my $tree = XML::LibXML->load_xml(string => <<'EOT'); <?xml version="1.0"?> <language> <english> <widget ID="1">input</widget> <widget ID="2">output</widget> </english> <deutsch> <widget ID="1">eingabe</widget> <widget ID="2">ausgabe</widget> </deutsch> </language> EOT test('english',1); test('deutsch',1); sub test { my ($language,$id) = @_; my @result=$tree->findnodes("/language/$language/widget[\@ID=$id]" +); print $_->textContent . "\n" for @result; my @result2=$tree->findnodes("/language/$language/widget[\@ID='$id +']"); print $_->textContent . "\n" for @result2; } [download] Output: `input input eingabe eingabe` [download]	[reply] [d/l] [select]
Re^7: language selection via libxml by choroba (Cardinal) on Jan 20, 2014 at 13:46 UTC
Re^8: language selection via libxml by tangent (Parson) on Jan 20, 2014 at 14:05 UTC
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Re^5: language selection via libxml by hdb (Monsignor) on Jan 20, 2014 at 12:52 UTC
You need to escape the quotes as well or use single quotes around your string: `$result=$tree->findnodes('/language/$language/widget[@ID="$id"]');` [download]	[reply] [d/l]
Re^6: language selection via libxml by tangent (Parson) on Jan 20, 2014 at 13:20 UTC
Using your example I get: `XPath error : Invalid expression /language/$language/widget[@ID="$id"] ^` [download]	[reply] [d/l]
Re^7: language selection via libxml by hdb (Monsignor) on Jan 20, 2014 at 13:22 UTC
Re^8: language selection via libxml by tangent (Parson) on Jan 20, 2014 at 13:34 UTC
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