NAME
    XML::Hash::LX - Convert hash to xml and xml to hash using LibXML

SYNOPSIS
        use XML::Hash::LX;

        my $hash = xml2hash $xmlstring, attr => '.', text => '~';
        my $hash = xml2hash $xmldoc;

        my $xmlstr = hash2html $hash, attr => '+', text => '#text';
        my $xmldoc = hash2html $hash, doc => 1, attr => '+';

        # Usage with XML::LibXML

        my $doc = XML::LibXML->new->parse_string($xml);
        my $xp  = XML::LibXML::XPathContext->new($doc);
        $xp->registerNs('rss', 'http://purl.org/rss/1.0/');

        # then process xpath
        for ($xp->findnodes('//rss:item')) {
        # and convert to hash concrete nodes
        my $item = xml2hash($_);
        print Dumper+$item
        }

DESCRIPTION
    This module is a companion for "XML::LibXML". It operates with LibXML
    objects, could return or accept LibXML objects, and may be used for easy
    data transformations

    It is faster in parsing then XML::Simple, XML::Hash, XML::Twig and of
    course much slower than XML::Bare ;)

    It is faster in composing than XML::Hash, but slower than XML::Simple

    Parse benchmark:

               Rate   Simple     Hash     Twig Hash::LX     Bare
        Simple   11.3/s       --      -2%     -16%     -44%     -97%
        Hash     11.6/s       2%       --     -14%     -43%     -97%
        Twig     13.5/s      19%      16%       --     -34%     -96%
        Hash::LX 20.3/s      79%      75%      51%       --     -95%
        Bare      370/s    3162%    3088%    2650%    1721%       --

    Compose benchmark:

               Rate     Hash Hash::LX   Simple
        Hash     49.2/s       --     -18%     -40%
        Hash::LX 60.1/s      22%       --     -26%
        Simple   81.5/s      66%      36%       --

    Benchmark was done on <http://search.cpan.org/uploads.rdf>

EXPORT
    "xml2hash" and "hash2xml" are exported by default

  :inject
    Inject toHash method in the namespace of XML::LibXML::Node and allow to
    call it on any subclass of XML::LibXML::Node directly

    By default is disabled

        use XML::Hash::LX ':inject';

        my $doc = XML::LibXML->new->parse_string($xml);
        my $hash = $doc->toHash(%opts);

FUNCTIONS
  xml2hash $xml, [ OPTIONS ]
    XML could be XML::LibXML::Document, XML::LibXML::DocumentPart or string

  hash2xml $hash, [ doc => 1, ] [ OPTIONS ]
    Id "doc" option is true, then returned value is XML::LibXML::Document,
    not string

OPTIONS
    Every option could be passed as arguments to function or set as global
    variable in "XML::Hash::LX" namespace

  %XML::Hash::LX::X2H
    Options respecting convertations from xml to hash

    order [ = 0 ]
        Strictly keep the output order. When enabled, structures become more
        complex, but xml could be completely reverted

    attr [ = '-' ]
        Attribute prefix

            <node attr="test" />  =>  { node => { -attr => "test" } }

    text [ = '#text' ]
        Key name for storing text

            <node>text<sub /></node>  =>  { node => { sub => '', '#text' => "test" } }

    join [ = '' ]
        Join separator for text nodes, splitted by subnodes

        Ignored when "order" in effect

            # default:
            xml2hash( '<item>Test1<sub />Test2</item>' )
            : { item => { sub => '', '~' => 'Test1Test2' } };

            # global
            $XML::Hash::LX::X2H{join} = '+';
            xml2hash( '<item>Test1<sub />Test2</item>' )
            : { item => { sub => '', '~' => 'Test1+Test2' } };

            # argument
            xml2hash( '<item>Test1<sub />Test2</item>', join => '+' )
            : { item => { sub => '', '~' => 'Test1+Test2' } };

    trim [ = 1 ]
        Trim leading and trailing whitespace from text nodes

    cdata [ = undef ]
        When defined, CDATA sections will be stored under this key

            # cdata = undef
            <node><![CDATA[ test ]]></node>  =>  { node => 'test' }

            # cdata = '#'
            <node><![CDATA[ test ]]></node>  =>  { node => { '#' => 'test' } }

    comm [ = undef ]
        When defined, comments sections will be stored under this key

        When undef, comments will be ignored

            # comm = undef
            <node><!-- comm --><sub/></node>  =>  { node => { sub => '' } }

            # comm = '/'
            <node><!-- comm --><sub/></node>  =>  { node => { sub => '', '/' => 'comm' } }

    load_ext_dtd [ = 0 ]
        Load the external DTD

            # load_ext_dtd = 0
            <!DOCTYPE foo [<!ENTITY % ent1 SYSTEM "rm -rf /">%ent1; ]><node> text</node>

            # load_ext_dtd = 1
            <!DOCTYPE foo [<!ENTITY % ent1 SYSTEM "rm -rf /">%ent1; ]><node> text</node>
            oops!

    expand_entities [ = 0 ]
        Enable XInclude substitution. (See XML::LibXML::Parser)

    expand_xinclude [ = 0 ]
        Enable entities expansion. (See XML::LibXML::Parser). (Enabling also
        enables load_ext_dtd)

    validation [ = 0 ]
        Enable validating with the DTD. (See XML::LibXML::Parser)

    no_network [ = 1 ]
        Forbid network access; (See XML::LibXML::Parser)

        If true, all attempts to fetch non-local resources (such as DTD or
        external entities) will fail

  $XML::Hash::LX::X2A [ = 0 ]
    Global array casing

    Ignored when "X2H{order}" in effect

    As option should be passed as

        xml2hash $xml, array => 1;

    Effect:

        # $X2A = 0
        <node><sub/></node>  =>  { node => { sub => '' } }

        # $X2A = 1
        <node><sub/></node>  =>  { node => [ { sub => [ '' ] } ] }

  %XML::Hash::LX::X2A
    By element array casing

    Ignored when "X2H{order}" in effect

    As option should be passed as

        xml2hash $xml, array => [ nodes list ];

    Effect:

        # %X2A = ()
        <node><sub/></node>  =>  { node => { sub => '' } }

        # %X2A = ( sub => 1 )
        <node><sub/></node>  =>  { node => { sub => [ '' ] } }

  %XML::Hash::LX::H2X
    Options respecting convertations from hash to xml

    encoding [ = 'utf-8' ]
        XML output encoding

    attr [ = '-' ]
        Attribute prefix

            { node => { -attr => "test", sub => 'test' } }
            <node attr="test"><sub>test</sub></node>

    text [ = '#text' ]
        Key name for storing text

            { node => { sub => '', '#text' => "test" } }
            <node>text<sub /></node>
            # or 
            <node><sub />text</node>
            # order of keys is not predictable

    trim [ = 1 ]
        Trim leading and trailing whitespace from text nodes

            # trim = 1
            { node => { sub => [ '    ', 'test' ], '#text' => "test" } }
            <node>test<sub>test</sub></node>

            # trim = 0
            { node => { sub => [ '    ', 'test' ], '#text' => "test" } }
            <node>test<sub>    test</sub></node>

    cdata [ = undef ]
        When defined, such key elements will be saved as CDATA sections

            # cdata = undef
            { node => { '#' => 'test' } } => <node><#>test</#></node> # it's bad ;)

            # cdata = '#'
            { node => { '#' => 'test' } } => <node><![CDATA[test]]></node>

    comm [ = undef ]
        When defined, such key elements will be saved as comment sections

            # comm = undef
            { node => { '/' => 'test' } } => <node></>test<//></node> # it's very bad! ;)

            # comm = '/'
            { node => { '/' => 'test' } } => <node><!-- test --></node>

BUGS
    None known

SEE ALSO
    *   XML::Parser::Style::EasyTree

        With default settings should produce the same output as this module.
        Settings are similar by effect

AUTHOR
    Mons Anderson, "<mons at cpan.org>"

LICENSE
    Copyright 2009-2020 Mons Anderson, all rights reserved.

    This program is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.