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✏️ Editing: class-wp-scripts.php

<?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
	 * @see wp_default_scripts()
	 * @var string|null
	 */
	public $base_url;

/**
	 * URL of the content directory.
	 *
	 * @since 2.8.0
	 * @see wp_default_scripts()
	 * @var string|null
	 */
	public $content_url;

/**
	 * Default version string for scripts.
	 *
	 * @since 2.6.0
	 * @see wp_default_scripts()
	 * @var string|null
	 */
	public $default_version;

/**
	 * Holds handles of scripts which are enqueued in footer.
	 *
	 * @since 2.8.0
	 * @var string[]
	 */
	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
	 * @see wp_default_scripts()
	 * @var string[]|null
	 */
	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<string, string[]>
	 */
	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;
		}

/*
		 * Do not print a sourceURL comment if concatenation is enabled.
		 *
		 * Extra scripts may be concatenated into a single script.
		 * The line-based sourceURL comments may break concatenated scripts
		 * and do not make sense when multiple scripts are joined together.
		 */
		if ( ! $this->do_concat ) {
			$output .= sprintf(
				"\n//# sourceURL=%s",
				rawurlencode( "{$handle}-js-extra" )
			);
		}

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 ( $obj->extra['conditional'] ?? false ) {
			return false;
		}

if ( null === $obj->ver ) {
			$ver = '';
		} else {
			$ver = $obj->ver ? $obj->ver : $this->default_version;
		}

if ( isset( $this->args[ $handle ] ) ) {
			$ver = $ver ? $ver . '&amp;' . $this->args[ $handle ] : $this->args[ $handle ];
		}

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

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;
		}

$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 = $before_script . $after_script;
		} 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 ( $translations ) {
			/*
			 * The sourceURL comment is not included by WP_Scripts::print_translations()
			 * when `$display` is `false` to prevent issues where the script tag contents are used
			 * by extenders for other purposes, for example concatenated with other script content.
			 *
			 * Include the sourceURL comment here as it would be when printed directly.
			 */
			$source_url    = rawurlencode( "{$handle}-js-translations" );
			$translations .= "\n//# sourceURL={$source_url}";
			$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.
			 */
			$filtered_src = apply_filters( 'script_loader_src', $src, $handle );

if (
				is_string( $filtered_src )
				&& $this->in_default_dir( $filtered_src )
				&& ( $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( $filtered_src ) ) {
				$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";
			}
		}

$this->print_extra_script( $handle );

// 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;
		}

$ver_to_add = '';
		if ( empty( $obj->ver ) && null !== $obj->ver && is_string( $this->default_version ) ) {
			$ver_to_add = $this->default_version;
		} elseif ( is_scalar( $obj->ver ) ) {
			$ver_to_add = (string) $obj->ver;
		}

$added_args = (string) ( $this->args[ $handle ] ?? '' );

if ( '' !== $ver_to_add || '' !== $added_args ) {
			$fragment = strstr( $src, '#' );
			if ( false !== $fragment ) {
				$src = substr( $src, 0, -strlen( $fragment ) );
			}

if ( '' !== $ver_to_add ) {
				$src .= ( str_contains( $src, '?' ) ? '&' : '?' ) . 'ver=' . rawurlencode( $ver_to_add );
			}
			if ( '' !== $added_args ) {
				$src .= ( str_contains( $src, '?' ) ? '&' : '?' ) . $added_args;
			}

if ( false !== $fragment ) {
				$src .= $fragment;
			}
		}

/** 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;
		}

// Determine fetchpriority.
		$original_fetchpriority = $obj->extra['fetchpriority'] ?? null;
		if ( null === $original_fetchpriority || ! $this->is_valid_fetchpriority( $original_fetchpriority ) ) {
			$original_fetchpriority = 'auto';
		}
		$actual_fetchpriority = $this->get_highest_fetchpriority_with_dependents( $handle );
		if ( null === $actual_fetchpriority ) {
			// If null, it's likely this script was not explicitly enqueued, so in this case use the original priority.
			$actual_fetchpriority = $original_fetchpriority;
		}
		if ( is_string( $actual_fetchpriority ) && 'auto' !== $actual_fetchpriority ) {
			$attr['fetchpriority'] = $actual_fetchpriority;
		}

if ( $original_fetchpriority !== $actual_fetchpriority ) {
			$attr['data-wp-fetchpriority'] = $original_fetchpriority;
		}

$tag  = $translations . $before_script;
		$tag .= wp_get_script_tag( $attr );
		$tag .= $after_script;

/**
		 * 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;
		}

return true;
	}

/**
	 * Adds extra code to a registered script.
	 *
	 * @since 4.5.0
	 *
	 * @param string $handle   Name of the script to add the inline script to.
	 *                         Must be lowercase.
	 * @param string $data     String containing the JavaScript to be added.
	 * @param string $position Optional. Whether to add the inline script
	 *                         before the handle or after. Default 'after'.
	 * @return bool True on success, false on failure.
	 */
	public function add_inline_script( $handle, $data, $position = 'after' ) {
		if ( ! $data ) {
			return false;
		}

if ( 'after' !== $position ) {
			$position = 'before';
		}

$script   = (array) $this->get_data( $handle, $position );
		$script[] = $data;

return $this->add_data( $handle, $position, $script );
	}

/**
	 * Prints inline scripts registered for a specific handle.
	 *
	 * @since 4.5.0
	 * @deprecated 6.3.0 Use methods get_inline_script_tag() or get_inline_script_data() instead.
	 *
	 * @param string $handle   Name of the script to print inline scripts for.
	 *                         Must be lowercase.
	 * @param string $position Optional. Whether to add the inline script
	 *                         before the handle or after. Default 'after'.
	 * @param bool   $display  Optional. Whether to print the script tag
	 *                         instead of just returning the script data. Default true.
	 * @return string|false Script data on success, false otherwise.
	 */
	public function print_inline_script( $handle, $position = 'after', $display = true ) {
		_deprecated_function( __METHOD__, '6.3.0', 'WP_Scripts::get_inline_script_data() or WP_Scripts::get_inline_script_tag()' );

$output = $this->get_inline_script_data( $handle, $position );
		if ( empty( $output ) ) {
			return false;
		}

if ( $display ) {
			echo $this->get_inline_script_tag( $handle, $position );
		}
		return $output;
	}

/**
	 * Gets data for inline scripts registered for a specific handle.
	 *
	 * @since 6.3.0
	 *
	 * @param string $handle   Name of the script to get data for.
	 *                         Must be lowercase.
	 * @param string $position Optional. Whether to add the inline script
	 *                         before the handle or after. Default 'after'.
	 * @return string Inline script, which may be empty string.
	 */
	public function get_inline_script_data( $handle, $position = 'after' ) {
		$data = $this->get_data( $handle, $position );
		if ( empty( $data ) || ! is_array( $data ) ) {
			return '';
		}

/*
		 * Print sourceURL comment regardless of concatenation.
		 *
		 * Inline scripts prevent scripts from being concatenated, so
		 * sourceURL comments are safe to print for inline scripts.
		 */
		$data[] = sprintf(
			'//# sourceURL=%s',
			rawurlencode( "{$handle}-js-{$position}" )
		);

return trim( implode( "\n", $data ), "\n" );
	}

/**
	 * Gets tags for inline scripts registered for a specific handle.
	 *
	 * @since 6.3.0
	 *
	 * @param string $handle   Name of the script to get associated inline script tag for.
	 *                         Must be lowercase.
	 * @param string $position Optional. Whether to get tag for inline
	 *                         scripts in the before or after position. Default 'after'.
	 * @return string Inline script, which may be empty string.
	 */
	public function get_inline_script_tag( $handle, $position = 'after' ) {
		$js = $this->get_inline_script_data( $handle, $position );
		if ( empty( $js ) ) {
			return '';
		}

$id = "{$handle}-js-{$position}";

return wp_get_inline_script_tag( $js, compact( 'id' ) );
	}

/**
	 * Localizes a script, only if the script has already been added.
	 *
	 * @since 2.1.0
	 *
	 * @param string               $handle      Name of the script to attach data to.
	 * @param string               $object_name Name of the variable that will contain the data.
	 * @param array<string, mixed> $l10n        Array of data to localize.
	 * @return bool True on success, false on failure.
	 */
	public function localize( $handle, $object_name, $l10n ) {
		if ( 'jquery' === $handle ) {
			$handle = 'jquery-core';
		}

if ( is_array( $l10n ) && isset( $l10n['l10n_print_after'] ) ) { // back compat, preserve the code in 'l10n_print_after' if present.
			$after = $l10n['l10n_print_after'];
			unset( $l10n['l10n_print_after'] );
		}

if ( ! is_array( $l10n ) ) {
			_doing_it_wrong(
				__METHOD__,
				sprintf(
					/* translators: 1: $l10n, 2: wp_add_inline_script() */
					__( 'The %1$s parameter must be an array. To pass arbitrary data to scripts, use the %2$s function instead.' ),
					'<code>$l10n</code>',
					'<code>wp_add_inline_script()</code>'
				),
				'5.7.0'
			);

if ( false === $l10n ) {
				// This should really not be needed, but is necessary for backward compatibility.
				$l10n = array( $l10n );
			}
		}

if ( is_string( $l10n ) ) {
			$l10n = html_entity_decode( $l10n, ENT_QUOTES, 'UTF-8' );
		} elseif ( is_array( $l10n ) ) {
			foreach ( $l10n as $key => $value ) {
				if ( ! is_scalar( $value ) ) {
					continue;
				}

$l10n[ $key ] = html_entity_decode( (string) $value, ENT_QUOTES, 'UTF-8' );
			}
		}

$script = "var $object_name = " . wp_json_encode( $l10n, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ) . ';';

if ( ! empty( $after ) ) {
			$script .= "\n$after;";
		}

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

if ( ! empty( $data ) ) {
			$script = "$data\n$script";
		}

return $this->add_data( $handle, 'data', $script );
	}

/**
	 * Sets handle group.
	 *
	 * @since 2.8.0
	 *
	 * @see WP_Dependencies::set_group()
	 *
	 * @param string    $handle    Name of the item. Should be unique.
	 * @param bool      $recursion Internal flag that calling function was called recursively.
	 * @param int|false $group     Optional. Group level: level (int), no groups (false).
	 *                             Default false.
	 * @return bool Not already in the group or a lower group.
	 */
	public function set_group( $handle, $recursion, $group = false ) {
		if ( isset( $this->registered[ $handle ]->args ) && 1 === $this->registered[ $handle ]->args ) {
			$calculated_group = 1;
		} else {
			$calculated_group = (int) $this->get_data( $handle, 'group' );
		}

if ( false !== $group && $calculated_group > $group ) {
			$calculated_group = $group;
		}

return parent::set_group( $handle, $recursion, $calculated_group );
	}

/**
	 * Sets a translation textdomain.
	 *
	 * @since 5.0.0
	 * @since 5.1.0 The `$domain` parameter was made optional.
	 *
	 * @param string $handle Name of the script to register a translation domain to.
	 * @param string $domain Optional. Text domain. Default 'default'.
	 * @param string $path   Optional. The full file path to the directory containing translation files.
	 * @return bool True if the text domain was registered, false if not.
	 */
	public function set_translations( $handle, $domain = 'default', $path = '' ) {
		if ( ! isset( $this->registered[ $handle ] ) ) {
			return false;
		}

/** @var \_WP_Dependency $obj */
		$obj = $this->registered[ $handle ];

if ( ! in_array( 'wp-i18n', $obj->deps, true ) ) {
			$obj->deps[] = 'wp-i18n';
		}

return $obj->set_translations( $domain, $path );
	}

/**
	 * Prints translations set for a specific handle.
	 *
	 * @since 5.0.0
	 *
	 * @param string $handle  Name of the script to add the inline script to.
	 *                        Must be lowercase.
	 * @param bool   $display Optional. Whether to print the script
	 *                        instead of just returning it. Default true.
	 * @return string|false Script on success, false otherwise.
	 */
	public function print_translations( $handle, $display = true ) {
		if ( ! isset( $this->registered[ $handle ] ) || empty( $this->registered[ $handle ]->textdomain ) ) {
			return false;
		}

$domain = $this->registered[ $handle ]->textdomain;
		$path   = '';

if ( isset( $this->registered[ $handle ]->translations_path ) ) {
			$path = $this->registered[ $handle ]->translations_path;
		}

$json_translations = load_script_textdomain( $handle, $domain, $path );

if ( ! $json_translations ) {
			return false;
		}

$output = <<<JS
( function( domain, translations ) {
	var localeData = translations.locale_data[ domain ] || translations.locale_data.messages;
	localeData[""].domain = domain;
	wp.i18n.setLocaleData( localeData, domain );
} )( "{$domain}", {$json_translations} );
JS;

if ( $display ) {
			$source_url = rawurlencode( "{$handle}-js-translations" );
			$output    .= "\n//# sourceURL={$source_url}";
			wp_print_inline_script_tag( $output, array( 'id' => "{$handle}-js-translations" ) );
		}

return $output;
	}

/**
	 * Determines script dependencies.
	 *
	 * @since 2.1.0
	 *
	 * @see WP_Dependencies::all_deps()
	 *
	 * @param string|string[] $handles   Item handle (string) or item handles (array of strings).
	 * @param bool            $recursion Optional. Internal flag that function is calling itself.
	 *                                   Default false.
	 * @param int|false       $group     Optional. Group level: level (int), no groups (false).
	 *                                   Default false.
	 * @return bool True on success, false on failure.
	 */
	public function all_deps( $handles, $recursion = false, $group = false ) {
		$result = parent::all_deps( $handles, $recursion, $group );
		if ( ! $recursion ) {
			/**
			 * Filters the list of script dependencies left to print.
			 *
			 * @since 2.3.0
			 *
			 * @param string[] $to_do An array of script dependency handles.
			 */
			$this->to_do = apply_filters( 'print_scripts_array', $this->to_do );
		}
		return $result;
	}

/**
	 * Processes items and dependencies for the head group.
	 *
	 * @since 2.8.0
	 *
	 * @see WP_Dependencies::do_items()
	 *
	 * @return string[] Handles of items that have been processed.
	 */
	public function do_head_items() {
		$this->do_items( false, 0 );
		return $this->done;
	}

/**
	 * Processes items and dependencies for the footer group.
	 *
	 * @since 2.8.0
	 *
	 * @see WP_Dependencies::do_items()
	 *
	 * @return string[] Handles of items that have been processed.
	 */
	public function do_footer_items() {
		$this->do_items( false, 1 );
		return $this->done;
	}

/**
	 * Whether a handle's source is in a default directory.
	 *
	 * @since 2.8.0
	 *
	 * @param string $src The source of the enqueued script.
	 * @return bool True if found, false if not.
	 */
	public function in_default_dir( $src ) {
		if ( ! $this->default_dirs ) {
			return true;
		}

if ( str_starts_with( $src, '/' . WPINC . '/js/l10n' ) ) {
			return false;
		}

foreach ( (array) $this->default_dirs as $test ) {
			if ( str_starts_with( $src, $test ) ) {
				return true;
			}
		}
		return false;
	}

/**
	 * This overrides the add_data method from WP_Dependencies, to support normalizing of $args.
	 *
	 * @since 6.3.0
	 *
	 * @param string $handle Name of the item. Should be unique.
	 * @param string $key    The data key.
	 * @param mixed  $value  The data value.
	 * @return bool True on success, false on failure.
	 */
	public function add_data( $handle, $key, $value ) {
		if ( ! isset( $this->registered[ $handle ] ) ) {
			return false;
		}

if ( 'conditional' === $key ) {
			// If a dependency is declared by a conditional script, remove it.
			$this->registered[ $handle ]->deps = array();
		}

if ( 'strategy' === $key ) {
			if ( ! empty( $value ) && ! $this->is_delayed_strategy( $value ) ) {
				_doing_it_wrong(
					__METHOD__,
					sprintf(
						/* translators: 1: $strategy, 2: $handle */
						__( 'Invalid strategy `%1$s` defined for `%2$s` during script registration.' ),
						is_string( $value ) ? $value : gettype( $value ),
						$handle
					),
					'6.3.0'
				);
				return false;
			} elseif ( ! $this->registered[ $handle ]->src && $this->is_delayed_strategy( $value ) ) {
				_doing_it_wrong(
					__METHOD__,
					sprintf(
						/* translators: 1: $strategy, 2: $handle */
						__( 'Cannot supply a strategy `%1$s` for script `%2$s` because it is an alias (it lacks a `src` value).' ),
						is_string( $value ) ? $value : gettype( $value ),
						$handle
					),
					'6.3.0'
				);
				return false;
			}
		} elseif ( 'fetchpriority' === $key ) {
			if ( empty( $value ) ) {
				$value = 'auto';
			}
			if ( ! $this->is_valid_fetchpriority( $value ) ) {
				_doing_it_wrong(
					__METHOD__,
					sprintf(
						/* translators: 1: $fetchpriority, 2: $handle */
						__( 'Invalid fetchpriority `%1$s` defined for `%2$s` during script registration.' ),
						is_string( $value ) ? $value : gettype( $value ),
						$handle
					),
					'6.9.0'
				);
				return false;
			} elseif ( ! $this->registered[ $handle ]->src ) {
				_doing_it_wrong(
					__METHOD__,
					sprintf(
						/* translators: 1: $fetchpriority, 2: $handle */
						__( 'Cannot supply a fetchpriority `%1$s` for script `%2$s` because it is an alias (it lacks a `src` value).' ),
						is_string( $value ) ? $value : gettype( $value ),
						$handle
					),
					'6.9.0'
				);
				return false;
			}
		} elseif ( 'module_dependencies' === $key ) {
			if ( ! is_array( $value ) ) {
				_doing_it_wrong(
					__METHOD__,
					sprintf(
						/* translators: 1: 'module_dependencies', 2: Script handle. */
						__( 'The value for "%1$s" must be an array for the "%2$s" script.' ),
						'module_dependencies',
						$handle
					),
					'7.0.0'
				);
				return false;
			}

$sanitized_value = array();
			$has_invalid_ids = false;
			foreach ( $value as $module ) {
				if (
					is_string( $module ) ||
					( is_array( $module ) && isset( $module['id'] ) && is_string( $module['id'] ) )
				) {
					$sanitized_value[] = $module;
				} else {
					$has_invalid_ids = true;
				}
			}

if ( $has_invalid_ids ) {
				_doing_it_wrong(
					__METHOD__,
					sprintf(
						/* translators: 1: Script handle, 2: 'module_dependencies' */
						__( 'The script handle "%1$s" has one or more of its script module dependencies ("%2$s") which are invalid.' ),
						$handle,
						'module_dependencies'
					),
					'7.0.0'
				);
			}

$value = $sanitized_value;
		}
		return parent::add_data( $handle, $key, $value );
	}

/**
	 * Gets all dependents of a script.
	 *
	 * This is not recursive.
	 *
	 * @since 6.3.0
	 *
	 * @param string $handle The script handle.
	 * @return string[] Script handles.
	 */
	private function get_dependents( $handle ) {
		// Check if dependents map for the handle in question is present. If so, use it.
		if ( isset( $this->dependents_map[ $handle ] ) ) {
			return $this->dependents_map[ $handle ];
		}

$dependents = array();

// Iterate over all registered scripts, finding dependents of the script passed to this method.
		foreach ( $this->registered as $registered_handle => $args ) {
			if ( in_array( $handle, $args->deps, true ) ) {
				$dependents[] = $registered_handle;
			}
		}

// Add the handles dependents to the map to ease future lookups.
		$this->dependents_map[ $handle ] = $dependents;

return $dependents;
	}

/**
	 * Checks if the strategy passed is a valid delayed (non-blocking) strategy.
	 *
	 * @since 6.3.0
	 *
	 * @param string|mixed $strategy The strategy to check.
	 * @return bool True if $strategy is one of the delayed strategies, otherwise false.
	 */
	private function is_delayed_strategy( $strategy ): bool {
		return in_array(
			$strategy,
			$this->delayed_strategies,
			true
		);
	}

/**
	 * Checks if the provided fetchpriority is valid.
	 *
	 * @since 6.9.0
	 *
	 * @param string|mixed $priority Fetch priority.
	 * @return bool Whether valid fetchpriority.
	 */
	private function is_valid_fetchpriority( $priority ): bool {
		return in_array( $priority, array( 'auto', 'low', 'high' ), true );
	}

/**
	 * Gets the best eligible loading strategy for a script.
	 *
	 * @since 6.3.0
	 *
	 * @param string $handle The script handle.
	 * @return string The best eligible loading strategy.
	 */
	private function get_eligible_loading_strategy( $handle ) {
		$intended_strategy = (string) $this->get_data( $handle, 'strategy' );

// Bail early if there is no intended strategy.
		if ( ! $intended_strategy ) {
			return '';
		}

/*
		 * If the intended strategy is 'defer', limit the initial list of eligible
		 * strategies, since 'async' can fallback to 'defer', but not vice-versa.
		 */
		$initial_strategy = ( 'defer' === $intended_strategy ) ? array( 'defer' ) : null;

$eligible_strategies = $this->filter_eligible_strategies( $handle, $initial_strategy );

// Return early once we know the eligible strategy is blocking.
		if ( empty( $eligible_strategies ) ) {
			return '';
		}

return in_array( 'async', $eligible_strategies, true ) ? 'async' : 'defer';
	}

/**
	 * Filter the list of eligible loading strategies for a script.
	 *
	 * @since 6.3.0
	 *
	 * @param string                  $handle              The script handle.
	 * @param string[]|null           $eligible_strategies Optional. The list of strategies to filter. Default null.
	 * @param array<string, true>     $checked             Optional. An array of already checked script handles, used to avoid recursive loops.
	 * @param array<string, string[]> $stored_results      Optional. An array of already computed eligible loading strategies by handle, used to increase performance in large dependency lists.
	 * @return string[] A list of eligible loading strategies that could be used.
	 */
	private function filter_eligible_strategies( $handle, $eligible_strategies = null, $checked = array(), array &$stored_results = array() ) {
		if ( isset( $stored_results[ $handle ] ) ) {
			return $stored_results[ $handle ];
		}

// If no strategies are being passed, all strategies are eligible.
		if ( null === $eligible_strategies ) {
			$eligible_strategies = $this->delayed_strategies;
		}

// If this handle was already checked, return early.
		if ( isset( $checked[ $handle ] ) ) {
			return $eligible_strategies;
		}

// Mark this handle as checked.
		$checked[ $handle ] = true;

// If this handle isn't registered, don't filter anything and return.
		if ( ! isset( $this->registered[ $handle ] ) ) {
			return $eligible_strategies;
		}

// If the handle is not enqueued, don't filter anything and return.
		if ( ! $this->query( $handle, 'enqueued' ) ) {
			return $eligible_strategies;
		}

$is_alias          = (bool) ! $this->registered[ $handle ]->src;
		$intended_strategy = $this->get_data( $handle, 'strategy' );

// For non-alias handles, an empty intended strategy filters all strategies.
		if ( ! $is_alias && empty( $intended_strategy ) ) {
			return array();
		}

// Handles with inline scripts attached in the 'after' position cannot be delayed.
		if ( $this->has_inline_script( $handle, 'after' ) ) {
			return array();
		}

// If the intended strategy is 'defer', filter out 'async'.
		if ( 'defer' === $intended_strategy ) {
			$eligible_strategies = array( 'defer' );
		}

$dependents = $this->get_dependents( $handle );

// Recursively filter eligible strategies for dependents.
		foreach ( $dependents as $dependent ) {
			// Bail early once we know the eligible strategy is blocking.
			if ( empty( $eligible_strategies ) ) {
				return array();
			}

$eligible_strategies = $this->filter_eligible_strategies( $dependent, $eligible_strategies, $checked, $stored_results );
		}
		$stored_results[ $handle ] = $eligible_strategies;
		return $eligible_strategies;
	}

/**
	 * Gets the highest fetch priority for a given script and all of its dependent scripts.
	 *
	 * @since 6.9.0
	 * @see self::filter_eligible_strategies()
	 * @see WP_Script_Modules::get_highest_fetchpriority()
	 *
	 * @param string                $handle         Script module ID.
	 * @param array<string, true>   $checked        Optional. An array of already checked script handles, used to avoid recursive loops.
	 * @param array<string, string> $stored_results Optional. An array of already computed max priority by handle, used to increase performance in large dependency lists.
	 * @return string|null Highest fetch priority for the script and its dependents.
	 */
	private function get_highest_fetchpriority_with_dependents( string $handle, array $checked = array(), array &$stored_results = array() ): ?string {
		if ( isset( $stored_results[ $handle ] ) ) {
			return $stored_results[ $handle ];
		}

// If there is a recursive dependency, return early.
		if ( isset( $checked[ $handle ] ) ) {
			return null;
		}

// Mark this handle as checked to guard against infinite recursion.
		$checked[ $handle ] = true;

// Abort if the script is not enqueued or a dependency of an enqueued script.
		if ( ! $this->query( $handle, 'enqueued' ) ) {
			return null;
		}

$fetchpriority = $this->get_data( $handle, 'fetchpriority' );
		if ( ! $this->is_valid_fetchpriority( $fetchpriority ) ) {
			$fetchpriority = 'auto';
		}

static $priorities   = array(
			'low',
			'auto',
			'high',
		);
		$high_priority_index = count( $priorities ) - 1;

$highest_priority_index = (int) array_search( $fetchpriority, $priorities, true );
		if ( $highest_priority_index !== $high_priority_index ) {
			foreach ( $this->get_dependents( $handle ) as $dependent_handle ) {
				$dependent_priority = $this->get_highest_fetchpriority_with_dependents( $dependent_handle, $checked, $stored_results );
				if ( is_string( $dependent_priority ) ) {
					$highest_priority_index = max(
						$highest_priority_index,
						(int) array_search( $dependent_priority, $priorities, true )
					);
					if ( $highest_priority_index === $high_priority_index ) {
						break;
					}
				}
			}
		}
		$stored_results[ $handle ] = $priorities[ $highest_priority_index ];
		return $priorities[ $highest_priority_index ];
	}

/**
	 * Gets data for inline scripts registered for a specific handle.
	 *
	 * @since 6.3.0
	 *
	 * @param string $handle   Name of the script to get data for. Must be lowercase.
	 * @param string $position The position of the inline script.
	 * @return bool Whether the handle has an inline script (either before or after).
	 */
	private function has_inline_script( $handle, $position = null ) {
		if ( $position && in_array( $position, array( 'before', 'after' ), true ) ) {
			return (bool) $this->get_data( $handle, $position );
		}

return (bool) ( $this->get_data( $handle, 'before' ) || $this->get_data( $handle, 'after' ) );
	}

/**
	 * Resets class properties.
	 *
	 * @since 2.8.0
	 */
	public function reset() {
		$this->do_concat      = false;
		$this->print_code     = '';
		$this->concat         = '';
		$this->concat_version = '';
		$this->print_html     = '';
		$this->ext_version    = '';
		$this->ext_handles    = '';
	}

/**
	 * Gets a script-specific dependency warning message.
	 *
	 * @since 6.9.1
	 *
	 * @param string   $handle                     Script handle with missing dependencies.
	 * @param string[] $missing_dependency_handles Missing dependency handles.
	 * @return string Formatted, localized warning message.
	 */
	protected function get_dependency_warning_message( $handle, $missing_dependency_handles ) {
		return sprintf(
			/* translators: 1: Script handle, 2: List of missing dependency handles. */
			__( 'The script with the handle "%1$s" was enqueued with dependencies that are not registered: %2$s.' ),
			$handle,
			implode( wp_get_list_item_separator(), $missing_dependency_handles )
		);
	}
}

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