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App-CSelUtils-0.089
River stage one • 7 direct dependents • 8 total dependents
/ App::CSelUtils

NAME

App::CSelUtils - Utilities related to Data::CSel

VERSION

This document describes version 0.089 of App::CSelUtils (from Perl distribution App-CSelUtils), released on 2022-10-17.

DESCRIPTION

This distribution contains the following utilities:

FUNCTIONS

ddsel

Usage:

 ddsel(%args) -> [$status_code, $reason, $payload, \%result_meta]

Select Perl data structure elements using CSel (CSS-selector-like) syntax.

Note that this operates against Perl data structure, not Perl source code elements (see ppisel for that). File is Perl source code that defines data structure, e.g.:

 {
     summary => 'This is a hash',
     # this is an array inside a hash
     array => [
         1, 2, 3,
     ],
 };

This function is not exported.

Arguments ('*' denotes required arguments):

  • expr => str

    (No description)

  • file => filename (default: "-")

    (No description)

  • node_actions => array[str] (default: ["print_as_string"])

    Specify action(s) to perform on matching nodes.

    Each action can be one of the following:

    • count will print the number of matching nodes.

    • print_method will call on or more of the node object's methods and print the result. Example:

      print_method:as_string

    • 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.:

      dump:tag.id.class

      which will result in a node printed like this:

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

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

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

      eval:'print $_->tag'

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

  • node_actions_on_descendants => str (default: "")

    Specify how descendants should be actioned upon.

    This option sets how node action is performed (See 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 as_string() method shows a node's string representation that does not include its descendants.

  • select_action => str (default: "csel")

    Specify how we should select nodes.

    The default is 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 Data::CSel.

    root will return a single node which is the root node.

Returns an enveloped result (an array).

First element ($status_code) is an integer containing HTTP-like status code (200 means OK, 4xx caller error, 5xx function error). Second element ($reason) is a string containing error message, or something like "OK" if status is 200. Third element ($payload) is the actual result, but usually not present when enveloped result is an error response ($status_code is not 2xx). Fourth element (%result_meta) is called result metadata and is optional, a hash that contains extra information, much like how HTTP response headers provide additional metadata.

Return value: (any)

parse_csel

Usage:

 parse_csel(%args) -> [$status_code, $reason, $payload, \%result_meta]

Parse CSel expression.

This function is not exported.

Arguments ('*' denotes required arguments):

  • expr* => str

    (No description)

Returns an enveloped result (an array).

First element ($status_code) is an integer containing HTTP-like status code (200 means OK, 4xx caller error, 5xx function error). Second element ($reason) is a string containing error message, or something like "OK" if status is 200. Third element ($payload) is the actual result, but usually not present when enveloped result is an error response ($status_code is not 2xx). Fourth element (%result_meta) is called result metadata and is optional, a hash that contains extra information, much like how HTTP response headers provide additional metadata.

Return value: (any)

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/App-CSelUtils.

SOURCE

Source repository is at https://github.com/perlancar/perl-App-CSelUtils.

SEE ALSO

htmlsel, orgsel, jsonsel, yamlsel, podsel, ppisel

AUTHOR

perlancar <perlancar@cpan.org>

CONTRIBUTING

To contribute, you can send patches by email/via RT, or send pull requests on GitHub.

Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:

 % prove -l

If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps required beyond that are considered a bug and can be reported to me.

COPYRIGHT AND LICENSE

This software is copyright (c) 2022, 2021, 2020, 2019, 2016 by perlancar <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.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=App-CSelUtils

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.