Interactivity API: Implement wp_initial_state()

[DAreRodz]

⚠️ This PR was superseded by #57556 as recent changes in the server directive processing code created merge conflicts that were hard to solve and time-consuming.

What?

Built on top of #56302
Tracking issue: #53740

Implements the wp_initial_state() function, a replacement for wp_store(), following the specification defined in the new store() API proposal. Extracted from the proposal:

If we move the derived state to the state property, there's no need to use the long wp_store format anymore: the state property can be absorbed in the function name (wp_initial_state) and the namespace can be passed as a string.

Instead of this:

wp_store( array(
  'state' => array(
    'myPlugin' => array(
      'someValue'  => 'some value',
      'someNumber' => 123,
    ),
  ),
  'selectors' => array(
    'myPlugin' => array(
      'someDerivedValue' => 'some derived value',
    ),
  ),
) );

We can write this and it will have the same information:

wp_initial_state( 'myPlugin', array(
  'someValue'        => 'some value',
  'someNumber'       => 123,
  'someDerivedValue' => 'some derived value',
) );

In addition, a system to handle store namespaces was added as required by wp_initial_state.

Why?

This function simplifies the way the initial state for interactive blocks is defined. Also, it is required to complete the migration to the new store() API.

How?

WIP

Testing Instructions

TBD

[github-actions]

This pull request has changed or added PHP files. Please confirm whether these changes need to be synced to WordPress Core, and therefore featured in the next release of WordPress.

If so, it is recommended to create a new Trac ticket and submit a pull request to the WordPress Core Github repository soon after this pull request is merged.

If you're unsure, you can always ask for help in the #core-editor channel in WordPress Slack.

Thank you! ❤️

View changed files

❔ lib/experimental/interactivity-api/class-wp-interactivity-initial-state.php
❔ lib/experimental/interactivity-api/directives/wp-interactive.php
❔ lib/experimental/interactivity-api/initial-state.php
❔ phpunit/experimental/interactivity-api/class-wp-interactivity-initial-state-test.php
❔ lib/experimental/interactivity-api/class-wp-directive-processor.php
❔ lib/experimental/interactivity-api/directive-processing.php
❔ lib/experimental/interactivity-api/directives/wp-bind.php
❔ lib/experimental/interactivity-api/directives/wp-class.php
❔ lib/experimental/interactivity-api/directives/wp-context.php
❔ lib/experimental/interactivity-api/directives/wp-style.php
❔ lib/experimental/interactivity-api/directives/wp-text.php
❔ lib/load.php
❔ phpunit/experimental/interactivity-api/directive-processing-test.php
❔ phpunit/experimental/interactivity-api/directives/wp-bind-test.php
❔ phpunit/experimental/interactivity-api/directives/wp-class-test.php
❔ phpunit/experimental/interactivity-api/directives/wp-context-test.php
❔ phpunit/experimental/interactivity-api/directives/wp-style-test.php
❔ phpunit/experimental/interactivity-api/directives/wp-text-test.php

[DAreRodz]

⚠️ This PR was superseded by #57556. Development continues there. 🙂