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Edit File : class-wp-scripts.php \| Size : 27.68 KB
<?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' ); $ie_conditional_prefix = ''; $ie_conditional_suffix = ''; $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 ) { $ie_conditional_prefix = "<!--[if {$conditional}]>\n"; $ie_conditional_suffix = "<![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 = $ie_conditional_prefix . $before_script . $after_script . $ie_conditional_suffix; } 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. / $filtered_src = apply_filters( 'script_loader_src', $src, $handle ); if ( $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 ) && ! $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 $ie_conditional_prefix; } $this->print_extra_script( $handle ); if ( $has_conditional_data ) { echo $ie_conditional_suffix; } // 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 . $ie_conditional_prefix . $before_script; $tag .= wp_get_script_tag( $attr ); $tag .= $after_script . $ie_conditional_suffix; /* * 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 ''; } 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 $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 ) . ';'; 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 ) { 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 ( '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.' ), $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).' ), $value, $handle ), '6.3.0' ); return false; } } return parent::add_data( $handle, $key, $value ); } /* * Gets all dependents of a script. * * @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 $strategy The strategy to check. * @return bool True if $strategy is one of the delayed strategies, otherwise false. / private function is_delayed_strategy( $strategy ) { return in_array( $strategy, $this->delayed_strategies, 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. * @return string[] A list of eligible loading strategies that could be used. / private function filter_eligible_strategies( $handle, $eligible_strategies = null, $checked = array() ) { // 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 ); } return $eligible_strategies; } /* * 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 = ''; } } Back

Edit File : class-wp-scripts.php | Size : 27.68 KB

<?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 . '&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' );
		$ie_conditional_prefix = '';
		$ie_conditional_suffix = '';
		$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 ) {
			$ie_conditional_prefix = "\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 = $ie_conditional_prefix . $before_script . $after_script . $ie_conditional_suffix;
		} 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.
			 */
			$filtered_src = apply_filters( 'script_loader_src', $src, $handle );

if (
				$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 ) && ! $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 $ie_conditional_prefix;
		}

$this->print_extra_script( $handle );

if ( $has_conditional_data ) {
			echo $ie_conditional_suffix;
		}

// 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 . $ie_conditional_prefix . $before_script;
		$tag .= wp_get_script_tag( $attr );
		$tag .= $after_script . $ie_conditional_suffix;

/**
		 * 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 '';
		}

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  $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 ) . ';';

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 ) {
			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 ( '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.' ),
						$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).' ),
						$value,
						$handle
					),
					'6.3.0'
				);
				return false;
			}
		}
		return parent::add_data( $handle, $key, $value );
	}

/**
	 * Gets all dependents of a script.
	 *
	 * @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 $strategy The strategy to check.
	 * @return bool True if $strategy is one of the delayed strategies, otherwise false.
	 */
	private function is_delayed_strategy( $strategy ) {
		return in_array(
			$strategy,
			$this->delayed_strategies,
			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.
	 * @return string[] A list of eligible loading strategies that could be used.
	 */
	private function filter_eligible_strategies( $handle, $eligible_strategies = null, $checked = array() ) {
		// 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 );
		}

return $eligible_strategies;
	}

/**
	 * 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    = '';
	}
}

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