<?php

/**

 * Dependencies API: WP_Scripts class

 *

 * @since 2.6.0

 *

 * @package WordPress

 * @subpackage Dependencies

 */

/**

 * Core class used to register scripts.

 *

 * @since 2.1.0

 *

 * @see WP_Dependencies

 */

class WP_Scripts extends WP_Dependencies {

	/**

	 * Base URL for scripts.

	 *

	 * Full URL with trailing slash.

	 *

	 * @since 2.6.0

	 * @var string

	 */

	public $base_url;

	/**

	 * URL of the content directory.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $content_url;

	/**

	 * Default version string for scripts.

	 *

	 * @since 2.6.0

	 * @var string

	 */

	public $default_version;

	/**

	 * Holds handles of scripts which are enqueued in footer.

	 *

	 * @since 2.8.0

	 * @var array

	 */

	public $in_footer = array();

	/**

	 * Holds a list of script handles which will be concatenated.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $concat = '';

	/**

	 * Holds a string which contains script handles and their version.

	 *

	 * @since 2.8.0

	 * @deprecated 3.4.0

	 * @var string

	 */

	public $concat_version = '';

	/**

	 * Whether to perform concatenation.

	 *

	 * @since 2.8.0

	 * @var bool

	 */

	public $do_concat = false;

	/**

	 * Holds HTML markup of scripts and additional data if concatenation

	 * is enabled.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $print_html = '';

	/**

	 * Holds inline code if concatenation is enabled.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $print_code = '';

	/**

	 * Holds a list of script handles which are not in the default directory

	 * if concatenation is enabled.

	 *

	 * Unused in core.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $ext_handles = '';

	/**

	 * Holds a string which contains handles and versions of scripts which

	 * are not in the default directory if concatenation is enabled.

	 *

	 * Unused in core.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $ext_version = '';

	/**

	 * List of default directories.

	 *

	 * @since 2.8.0

	 * @var array

	 */

	public $default_dirs;

	/**

	 * Holds a mapping of dependents (as handles) for a given script handle.

	 * Used to optimize recursive dependency tree checks.

	 *

	 * @since 6.3.0

	 * @var array

	 */

	private $dependents_map = array();

	/**

	 * Holds a reference to the delayed (non-blocking) script loading strategies.

	 * Used by methods that validate loading strategies.

	 *

	 * @since 6.3.0

	 * @var string[]

	 */

	private $delayed_strategies = array( 'defer', 'async' );

	/**

	 * Constructor.

	 *

	 * @since 2.6.0

	 */

	public function __construct() {

		$this->init();

		add_action( 'init', array( $this, 'init' ), 0 );

	}

	/**

	 * Initialize the class.

	 *

	 * @since 3.4.0

	 */

	public function init() {

		/**

		 * Fires when the WP_Scripts instance is initialized.

		 *

		 * @since 2.6.0

		 *

		 * @param WP_Scripts $wp_scripts WP_Scripts instance (passed by reference).

		 */

		do_action_ref_array( 'wp_default_scripts', array( &$this ) );

	}

	/**

	 * Prints scripts.

	 *

	 * Prints the scripts passed to it or the print queue. Also prints all necessary dependencies.

	 *

	 * @since 2.1.0

	 * @since 2.8.0 Added the `$group` parameter.

	 *

	 * @param string|string[]|false $handles Optional. Scripts to be printed: queue (false),

	 *                                       single script (string), or multiple scripts (array of strings).

	 *                                       Default false.

	 * @param int|false             $group   Optional. Group level: level (int), no groups (false).

	 *                                       Default false.

	 * @return string[] Handles of scripts that have been printed.

	 */

	public function print_scripts( $handles = false, $group = false ) {

		return $this->do_items( $handles, $group );

	}

	/**

	 * Prints extra scripts of a registered script.

	 *

	 * @since 2.1.0

	 * @since 2.8.0 Added the `$display` parameter.

	 * @deprecated 3.3.0

	 *

	 * @see print_extra_script()

	 *

	 * @param string $handle  The script's registered handle.

	 * @param bool   $display Optional. Whether to print the extra script

	 *                        instead of just returning it. Default true.

	 * @return bool|string|void Void if no data exists, extra scripts if `$display` is true,

	 *                          true otherwise.

	 */

	public function print_scripts_l10n( $handle, $display = true ) {

		_deprecated_function( __FUNCTION__, '3.3.0', 'WP_Scripts::print_extra_script()' );

		return $this->print_extra_script( $handle, $display );

	}

	/**

	 * Prints extra scripts of a registered script.

	 *

	 * @since 3.3.0

	 *

	 * @param string $handle  The script's registered handle.

	 * @param bool   $display Optional. Whether to print the extra script

	 *                        instead of just returning it. Default true.

	 * @return bool|string|void Void if no data exists, extra scripts if `$display` is true,

	 *                          true otherwise.

	 */

	public function print_extra_script( $handle, $display = true ) {

		$output = $this->get_data( $handle, 'data' );

		if ( ! $output ) {

			return;

		}

		if ( ! $display ) {

			return $output;

		}

		wp_print_inline_script_tag( $output, array( 'id' => "{$handle}-js-extra" ) );

		return true;

	}

	/**

	 * Checks whether all dependents of a given handle are in the footer.

	 *

	 * If there are no dependents, this is considered the same as if all dependents were in the footer.

	 *

	 * @since 6.4.0

	 *

	 * @param string $handle Script handle.

	 * @return bool Whether all dependents are in the footer.

	 */

	private function are_all_dependents_in_footer( $handle ) {

		foreach ( $this->get_dependents( $handle ) as $dep ) {

			if ( isset( $this->groups[ $dep ] ) && 0 === $this->groups[ $dep ] ) {

				return false;

			}

		}

		return true;

	}

	/**

	 * Processes a script dependency.

	 *

	 * @since 2.6.0

	 * @since 2.8.0 Added the `$group` parameter.

	 *

	 * @see WP_Dependencies::do_item()

	 *

	 * @param string    $handle The script's registered handle.

	 * @param int|false $group  Optional. Group level: level (int), no groups (false).

	 *                          Default false.

	 * @return bool True on success, false on failure.

	 */

	public function do_item( $handle, $group = false ) {

		if ( ! parent::do_item( $handle ) ) {

			return false;

		}

		if ( 0 === $group && $this->groups[ $handle ] > 0 ) {

			$this->in_footer[] = $handle;

			return false;

		}

		if ( false === $group && in_array( $handle, $this->in_footer, true ) ) {

			$this->in_footer = array_diff( $this->in_footer, (array) $handle );

		}

		$obj = $this->registered[ $handle ];

		if ( null === $obj->ver ) {

			$ver = '';

		} else {

			$ver = $obj->ver ? $obj->ver : $this->default_version;

		}

		if ( isset( $this->args[ $handle ] ) ) {

			$ver = $ver ? $ver . '&' . $this->args[ $handle ] : $this->args[ $handle ];

		}

		$src               = $obj->src;

		$strategy          = $this->get_eligible_loading_strategy( $handle );

		$intended_strategy = (string) $this->get_data( $handle, 'strategy' );

		$cond_before       = '';

		$cond_after        = '';

		$conditional       = isset( $obj->extra['conditional'] ) ? $obj->extra['conditional'] : '';

		if ( ! $this->is_delayed_strategy( $intended_strategy ) ) {

			$intended_strategy = '';

		}

		/*

		 * Move this script to the footer if:

		 * 1. The script is in the header group.

		 * 2. The current output is the header.

		 * 3. The intended strategy is delayed.

		 * 4. The actual strategy is not delayed.

		 * 5. All dependent scripts are in the footer.

		 */

		if (

			0 === $group &&

			0 === $this->groups[ $handle ] &&

			$intended_strategy &&

			! $this->is_delayed_strategy( $strategy ) &&

			$this->are_all_dependents_in_footer( $handle )

		) {

			$this->in_footer[] = $handle;

			return false;

		}

		if ( $conditional ) {

			$cond_before = "<!--[if {$conditional}]>\n";

			$cond_after  = "<![endif]-->\n";

		}

		$before_script = $this->get_inline_script_tag( $handle, 'before' );

		$after_script  = $this->get_inline_script_tag( $handle, 'after' );

		if ( $before_script || $after_script ) {

			$inline_script_tag = $cond_before . $before_script . $after_script . $cond_after;

		} else {

			$inline_script_tag = '';

		}

		/*

		 * Prevent concatenation of scripts if the text domain is defined

		 * to ensure the dependency order is respected.

		 */

		$translations_stop_concat = ! empty( $obj->textdomain );

		$translations = $this->print_translations( $handle, false );

		if ( $translations ) {

			$translations = wp_get_inline_script_tag( $translations, array( 'id' => "{$handle}-js-translations" ) );

		}

		if ( $this->do_concat ) {

			/**

			 * Filters the script loader source.

			 *

			 * @since 2.2.0

			 *

			 * @param string $src    Script loader source path.

			 * @param string $handle Script handle.

			 */

			$srce = apply_filters( 'script_loader_src', $src, $handle );

			if (

				$this->in_default_dir( $srce )

				&& ( $before_script || $after_script || $translations_stop_concat || $this->is_delayed_strategy( $strategy ) )

			) {

				$this->do_concat = false;

				// Have to print the so-far concatenated scripts right away to maintain the right order.

				_print_scripts();

				$this->reset();

			} elseif ( $this->in_default_dir( $srce ) && ! $conditional ) {

				$this->print_code     .= $this->print_extra_script( $handle, false );

				$this->concat         .= "$handle,";

				$this->concat_version .= "$handle$ver";

				return true;

			} else {

				$this->ext_handles .= "$handle,";

				$this->ext_version .= "$handle$ver";

			}

		}

		$has_conditional_data = $conditional && $this->get_data( $handle, 'data' );

		if ( $has_conditional_data ) {

			echo $cond_before;

		}

		$this->print_extra_script( $handle );

		if ( $has_conditional_data ) {

			echo $cond_after;

		}

		// A single item may alias a set of items, by having dependencies, but no source.

		if ( ! $src ) {

			if ( $inline_script_tag ) {

				if ( $this->do_concat ) {

					$this->print_html .= $inline_script_tag;

				} else {

					echo $inline_script_tag;

				}

			}

			return true;

		}

		if ( ! preg_match( '|^(https?:)?//|', $src ) && ! ( $this->content_url && str_starts_with( $src, $this->content_url ) ) ) {

			$src = $this->base_url . $src;

		}

		if ( ! empty( $ver ) ) {

			$src = add_query_arg( 'ver', $ver, $src );

		}

		/** This filter is documented in wp-includes/class-wp-scripts.php */

		$src = esc_url_raw( apply_filters( 'script_loader_src', $src, $handle ) );

		if ( ! $src ) {

			return true;

		}

		$attr = array(

			'src' => $src,

			'id'  => "{$handle}-js",

		);

		if ( $strategy ) {

			$attr[ $strategy ] = true;

		}

		if ( $intended_strategy ) {

			$attr['data-wp-strategy'] = $intended_strategy;

		}

		$tag  = $translations . $cond_before . $before_script;

		$tag .= wp_get_script_tag( $attr );

		$tag .= $after_script . $cond_after;

		/**

		 * Filters the HTML script tag of an enqueued script.

		 *

		 * @since 4.1.0

		 *

		 * @param string $tag    The `<script>` tag for the enqueued script.

		 * @param string $handle The script's registered handle.

		 * @param string $src    The script's source URL.

		 */

		$tag = apply_filters( 'script_loader_tag', $tag, $handle, $src );

		if ( $this->do_concat ) {

			$this->print_html .= $tag;

		} else {

			echo $tag;