package App::yamlsel;

our $DATE = '2020-04-29'; # DATE
our $VERSION = '0.008'; # VERSION

use 5.010001;
use strict;
use warnings;

use App::CSelUtils;
use Scalar::Util qw(refaddr);

our %SPEC;

sub _encode_yaml {
    require YAML::XS;

sub _decode_yaml {
    require YAML::XS;

$SPEC{yamlsel} = {
    v => 1.1,
    summary => 'Select YAML elements using CSel (CSS-selector-like) syntax',
    args => {
sub yamlsel {

        code_read_tree => sub {
            my $args = shift;
            my $data;
            if ($args->{file} eq '-') {
                binmode STDIN, ":encoding(utf8)";
                $data = _decode_yaml(join "", <>);
            } else {
                require File::Slurper;
                $data = _decode_yaml(File::Slurper::read_text($args->{file}));

            require Data::CSel::WrapStruct;
            my $tree = Data::CSel::WrapStruct::wrap_struct($data);

        csel_opts => {class_prefixes=>['Data::CSel::WrapStruct']},

        code_transform_node_actions => sub {
            my $args = shift;

            for my $action (@{ $args->{node_actions} }) {
                if ($action eq 'print' || $action eq 'print_as_string') {
                    $action = 'print_func_or_meth:meth:value.func:App::yamlsel::_encode_yaml';
                } elsif ($action eq 'dump') {
                    $action = 'dump:value';

# ABSTRACT: Select YAML elements using CSel (CSS-selector-like) syntax



=encoding UTF-8

=head1 NAME

App::yamlsel - Select YAML elements using CSel (CSS-selector-like) syntax

=head1 VERSION

This document describes version 0.008 of App::yamlsel (from Perl distribution App-yamlsel), released on 2020-04-29.



=head2 yamlsel


 yamlsel(%args) -> [status, msg, payload, meta]

Select YAML elements using CSel (CSS-selector-like) syntax.

This function is not exported.

Arguments ('*' denotes required arguments):

=over 4

=item * B<expr> => I<str>

=item * B<file> => I<filename> (default: "-")

=item * B<node_actions> => I<array[str]> (default: ["print_as_string"])

Specify action(s) to perform on matching nodes.

Each action can be one of the following:


=item * C<count> will print the number of matching nodes.

=item * C<print_method> will call on or more of the node object's methods and print the
result. Example:


=item * C<dump> will show a indented text representation of the node and its
descendants. Each line will print information about a single node: its class,
followed by the value of one or more attributes. You can specify which
attributes to use in a dot-separated syntax, e.g.:

which will result in a node printed like this:

HTML::Element tag=p id=undef class=undef


By default, if no attributes are specified, C<id> is used. If the node class does
not support the attribute, or if the value of the attribute is undef, then
C<undef> is shown.


=item * C<eval> will execute Perl code for each matching node. The Perl code will be
called with arguments: C<($node)>. For convenience, C<$_> is also locally set to
the matching node. Example in L<htmlsel> you can add this action:

eval:'print $_->tag'

which will print the tag name for each matching L<HTML::Element> node.


=item * B<node_actions_on_descendants> => I<str> (default: "")

Specify how descendants should be actioned upon.

This option sets how node action is performed (See C<node_actions> option).

When set to '' (the default), then only matching nodes are actioned upon.

When set to 'descendants_depth_first', then after each matching node is actioned
upon by an action, the descendants of the matching node are also actioned, in
depth-first order. This option is sometimes necessary e.g. when your node's
C<as_string()> method shows a node's string representation that does not include
its descendants.

=item * B<select_action> => I<str> (default: "csel")

Specify how we should select nodes.

The default is C<csel>, which will select nodes from the tree using the CSel
expression. Note that the root node itself is not included. For more details on
CSel expression, refer to L<Data::CSel>.

C<root> will return a single node which is the root node.


Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code
(200 means OK, 4xx caller error, 5xx function error). Second element
(msg) is a string containing error message, or 'OK' if status is
200. Third element (payload) is optional, the actual result. Fourth
element (meta) is called result metadata and is optional, a hash
that contains extra information.

Return value:  (any)


Please visit the project's homepage at L<>.

=head1 SOURCE

Source repository is at L<>.

=head1 BUGS

Please report any bugs or feature requests on the bugtracker website L<>

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

=head1 AUTHOR

perlancar <>


This software is copyright (c) 2020, 2019, 2016 by

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