xml - 找不到 ParserDetails.ini

Question

could not find ParserDetails.ini in /reports/ie/lib/cpan/XML/SAX
 at /reports/ie/lib/cpan/XML/SAX.pm line 212
        XML::SAX::do_warn('XML::SAX', 'could not find ParserDetails.ini in /reports/ie/lib/cpan/XML/...') called at /reports/ie/lib/cpan/XML/SAX.pm line 62
        XML::SAX::load_parsers('XML::SAX') called at /reports/ie/lib/cpan/XML/SAX.pm line 115
        XML::SAX::parsers('XML::SAX') called at /reports/ie/lib/cpan/XML/SAX/ParserFactory.pm line 18
        XML::SAX::ParserFactory::new('XML::SAX::ParserFactory') called at /reports/ie/lib/cpan/XML/SAX/ParserFactory.pm line 26
        XML::SAX::ParserFactory::parser('XML::SAX::ParserFactory', 'Handler', 'XML::Simple=HASH(0x162c6e30)') called at /reports/ie/lib/cpan/XML/Simple.pm line 358
        XML::Simple::build_tree('XML::Simple=HASH(0x162c6e30)', 'changelog.xml', 'undef') called at /reports/ie/lib/cpan/XML/Simple.pm line 308
        XML::Simple::build_simple_tree('XML::Simple=HASH(0x162c6e30)', 'changelog.xml', 'undef') called at /reports/ie/lib/cpan/XML/Simple.pm line 227
        XML::Simple::parse_file('XML::Simple=HASH(0x162c6e30)', 'changelog.xml') called at /reports/ie/lib/cpan/XML/Simple.pm line 195
        XML::Simple::XMLin('XML::Simple=HASH(0x162c6e30)', 'changelog.xml') called at perlXML_test.pl line 11

Answer 1

It's a warning saying you don't have any SAX parser for XML::SAX to use except the slow and buggy XML::SAX::PurePerl.

Installing a parser for XML::SAX will update the file, creating it if necessary.

cpan XML::LibXML::SAX

You could also tell XML::Simple to use XML::Parser instead of XML::SAX.

$XML::Simple::PREFERRED_PARSER = 'XML::Parser';

Setting environment variable XML_SIMPLE_PREFERRED_PARSER to the same value will have the same effect.

XML::Parser is much faster backend than any of the XML::SAX parsers that exited when I did benchmarks a couple of years ago. It doesn't handle namespaces, though.

Personally, I'd avoid XML::Simple. It's the hardest XML parser to use correctly. I use XML::LibXML.