<?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<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 . '&' . $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 (
$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;
}
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;
}
// Determine fetchpriority.
$original_fetchpriority = isset( $obj->extra['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 $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.' ),
$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;
}
} 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;
}
}
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 ]; // @phpstan-ignore parameterByRef.type (We know the index is valid and that this will be a string.)
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 )
);
}
}