NAME
    Data::CSel::WrapStruct - Wrap data structure into a tree of objects
    suitable for use with Data::CSel

VERSION
    This document describes version 0.004 of Data::CSel::WrapStruct (from
    Perl distribution Data-CSel-WrapStruct), released on 2019-07-29.

SYNOPSIS
     use Data::CSel qw(csel);
     use Data::CSel::WrapStruct qw(wrap_struct);

     my $data = [
         0,
         1,
         [2, ["two","dua"], {url=>"http://example.com/two.jpg"}, ["even","prime"]],
         3,
         [4, ["four","empat"], {}, ["even"]],
     ];

     my $tree = wrap_struct($data);
     my @nodes = csel(":root > * > *:nth-child(4) > *", $tree);
     my @tags = map { $_->value } @nodes; # -> ("even", "prime", "even")

    Arrays are wrapped in a Data::CSel::WrapStruct::Array, hashes in a
    Data::CSel::WrapStruct::Hash, and so on. So if you are using type
    selectors, you might want to add "Data::CSel::WrapStruct" into
    "class_prefixes" for convenience:

     my @hashes = map {$_->value} csel({class_prefixes=>["Data::CSel::WrapStruct"]}, "Hash", $tree);
     # -> ({url=>"http://example.com/two.jpg"}, {})

    The wrapper objects provide some methods, e.g.:

     my @empty_hashes = map {$_->value} csel({class_prefixes=>["Data::CSel::WrapStruct"]}, "Hash[length=0]", $tree);
     # -> ({})

    Refer to their respective documentation for the list of methods
    available.

    Some more examples:

     [map {$_->value} csel({class_prefixes=>["Data::CSel::WrapStruct"]}, "Scalar[value >= 3]")]
     # -> (3, 4)

DESCRIPTION
    This module provides "wrap_struct()" which creates a tree of objects
    from a generic data structure. You can then perform node selection using
    Data::CSel's "csel()".

    You can retrieve the original value of data items by calling "value()"
    method on the tree nodes.

FUNCTIONS
    None exported by default, but exportable.

  wrap_struct($data) => tree
    Wrap a data structure using a tree of objects.

    Currently cannot handle recursive structure.

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/Data-CSel-WrapStruct>.

SOURCE
    Source repository is at
    <https://github.com/perlancar/perl-Data-CSel-WrapStruct>.

BUGS
    Please report any bugs or feature requests on the bugtracker website
    <https://rt.cpan.org/Public/Dist/Display.html?Name=Data-CSel-WrapStruct>

    When submitting a bug or request, please include a test-file or a patch
    to an existing test-file that illustrates the bug or desired feature.

SEE ALSO
    Data::CSel

AUTHOR
    perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2019, 2016 by perlancar@cpan.org.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.