I18N: Extract shared helper for loading script translation files.

Refactor load_script_textdomain() and load_script_module_textdomain()
to share a private helper, _load_script_textdomain_from_src(), that
handles the path resolution and file lookup logic. Each public function
now only resolves the source URL for its respective registry and
delegates to the helper with the appropriate filter name.

Reduces duplication by ~88 lines while preserving behavior and the
existing load_script_textdomain_relative_path filter.

Author: manzoorwanijk

src/wp-includes/l10n.php

@@ -1134,24 +1134,52 @@ function load_child_theme_textdomain( $domain, $path = false ) {
  *
  * @see WP_Scripts::set_translations()
  *
- * @global WP_Textdomain_Registry $wp_textdomain_registry WordPress Textdomain Registry.
- *
  * @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 string|false The translated strings in JSON encoding on success,
  *                      false if the script textdomain could not be loaded.
  */
 function load_script_textdomain( $handle, $domain = 'default', $path = '' ) {
-	/** @var WP_Textdomain_Registry $wp_textdomain_registry */
-	global $wp_textdomain_registry;
-
 	$wp_scripts = wp_scripts();
 
 	if ( ! isset( $wp_scripts->registered[ $handle ] ) ) {
 		return false;
 	}
 
+	$src = $wp_scripts->registered[ $handle ]->src;
+
+	if ( ! preg_match( '|^(https?:)?//|', $src ) && ! ( $wp_scripts->content_url && str_starts_with( $src, $wp_scripts->content_url ) ) ) {
+		$src = $wp_scripts->base_url . $src;
+	}
+
+	return _load_script_textdomain_from_src( $handle, $src, $domain, $path, 'load_script_textdomain_relative_path' );
+}
+
+/**
+ * Resolves and loads the translation JSON file for a given script or script module source URL.
+ *
+ * This is a shared implementation used by {@see load_script_textdomain()} and
+ * {@see load_script_module_textdomain()} to avoid duplicating the path
+ * resolution and file lookup logic.
+ *
+ * @since 7.0.0
+ * @access private
+ *
+ * @global WP_Textdomain_Registry $wp_textdomain_registry WordPress Textdomain Registry.
+ *
+ * @param string $handle      Name of the script or script module identifier to register a translation domain to.
+ * @param string $src         Absolute source URL of the script or script module.
+ * @param string $domain      Text domain.
+ * @param string $path        The full file path to the directory containing translation files,
+ *                            or an empty string to use the default path from the text domain registry.
+ * @param string $filter_name Name of the filter to apply to the resolved relative path
+ *                            ('load_script_textdomain_relative_path' or 'load_script_module_textdomain_relative_path').
+ * @return string|false The JSON-encoded translated strings on success, false otherwise.
+ */
+function _load_script_textdomain_from_src( $handle, $src, $domain, $path, $filter_name ) {
+	global $wp_textdomain_registry;
+
 	$locale = determine_locale();
 
 	if ( ! $path ) {
@@ -1172,12 +1200,6 @@ function load_script_textdomain( $handle, $domain = 'default', $path = '' ) {
 		}
 	}
 
-	$src = $wp_scripts->registered[ $handle ]->src;
-
-	if ( ! preg_match( '|^(https?:)?//|', $src ) && ! ( $wp_scripts->content_url && str_starts_with( $src, $wp_scripts->content_url ) ) ) {
-		$src = $wp_scripts->base_url . $src;
-	}
-
 	$relative       = false;
 	$languages_path = WP_LANG_DIR;
 
@@ -1242,14 +1264,20 @@ function load_script_textdomain( $handle, $domain = 'default', $path = '' ) {
 	}
 
 	/**
-	 * Filters the relative path of scripts used for finding translation files.
+	 * Filters the relative path used for finding translation files.
 	 *
-	 * @since 5.0.2
+	 * The filter name is either `load_script_textdomain_relative_path` for
+	 * classic scripts or `load_script_module_textdomain_relative_path` for
+	 * script modules.
 	 *
-	 * @param string|false $relative The relative path of the script. False if it could not be determined.
-	 * @param string       $src      The full source URL of the script.
+	 * @since 5.0.2 The `load_script_textdomain_relative_path` filter was added.
+	 * @since 7.0.0 The `load_script_module_textdomain_relative_path` filter was added.
+	 *
+	 * @param string|false $relative The relative path of the script or script module source.
+	 *                               False if it could not be determined.
+	 * @param string       $src      The full source URL of the script or script module.
 	 */
-	$relative = apply_filters( 'load_script_textdomain_relative_path', $relative, $src );
+	$relative = apply_filters( $filter_name, $relative, $src );
 
 	// If the source is not from WP.
 	if ( false === $relative ) {
@@ -1288,142 +1316,25 @@ function load_script_textdomain( $handle, $domain = 'default', $path = '' ) {
  *
  * @since 7.0.0
  *
- * @global WP_Textdomain_Registry $wp_textdomain_registry WordPress Textdomain Registry.
- *
  * @param string $id     The script module identifier.
  * @param string $domain Optional. Text domain. Default 'default'.
  * @param string $path   Optional. The full file path to the directory containing translation files.
  * @return string|false The JSON-encoded translated strings for the given script module and text domain.
  *                      False if there are none.
  */
 function load_script_module_textdomain( string $id, string $domain = 'default', string $path = '' ) {
-	global $wp_textdomain_registry;
-
 	$src = wp_script_modules()->get_registered_src( $id );
 
 	if ( null === $src ) {
 		return false;
 	}
 
-	$locale = determine_locale();
-
-	if ( ! $path ) {
-		$path = $wp_textdomain_registry->get( $domain, $locale );
-	}
-
-	$path = untrailingslashit( $path );
-
-	// If a path was given and the handle file exists simply return it.
-	$file_base       = 'default' === $domain ? $locale : $domain . '-' . $locale;
-	$handle_filename = $file_base . '-' . $id . '.json';
-
-	if ( $path ) {
-		$translations = load_script_translations( $path . '/' . $handle_filename, $id, $domain );
-
-		if ( $translations ) {
-			return $translations;
-		}
-	}
-
 	// Ensure src is an absolute URL for path resolution.
 	if ( ! preg_match( '|^(https?:)?//|', $src ) ) {
 		$src = site_url( $src );
 	}
 
-	$relative       = false;
-	$languages_path = WP_LANG_DIR;
-
-	$src_url     = wp_parse_url( $src );
-	$content_url = wp_parse_url( content_url() );
-	$plugins_url = wp_parse_url( plugins_url() );
-	$site_url    = wp_parse_url( site_url() );
-	$theme_root  = get_theme_root();
-
-	// If the host is the same or it's a relative URL.
-	if (
-		( ! isset( $content_url['path'] ) || str_starts_with( $src_url['path'], $content_url['path'] ) ) &&
-		( ! isset( $src_url['host'] ) || ! isset( $content_url['host'] ) || $src_url['host'] === $content_url['host'] )
-	) {
-		// Make the src relative the specific plugin or theme.
-		if ( isset( $content_url['path'] ) ) {
-			$relative = substr( $src_url['path'], strlen( $content_url['path'] ) );
-		} else {
-			$relative = $src_url['path'];
-		}
-		$relative = trim( $relative, '/' );
-		$relative = explode( '/', $relative );
-
-		$theme_dir = array_slice( explode( '/', $theme_root ), -1 );
-		$dirname   = $theme_dir[0] === $relative[0] ? 'themes' : 'plugins';
-
-		$languages_path = WP_LANG_DIR . '/' . $dirname;
-
-		$relative = array_slice( $relative, 2 ); // Remove plugins/<plugin name> or themes/<theme name>.
-		$relative = implode( '/', $relative );
-	} elseif (
-		( ! isset( $plugins_url['path'] ) || str_starts_with( $src_url['path'], $plugins_url['path'] ) ) &&
-		( ! isset( $src_url['host'] ) || ! isset( $plugins_url['host'] ) || $src_url['host'] === $plugins_url['host'] )
-	) {
-		// Make the src relative the specific plugin.
-		if ( isset( $plugins_url['path'] ) ) {
-			$relative = substr( $src_url['path'], strlen( $plugins_url['path'] ) );
-		} else {
-			$relative = $src_url['path'];
-		}
-		$relative = trim( $relative, '/' );
-		$relative = explode( '/', $relative );
-
-		$languages_path = WP_LANG_DIR . '/plugins';
-
-		$relative = array_slice( $relative, 1 ); // Remove <plugin name>.
-		$relative = implode( '/', $relative );
-	} elseif ( ! isset( $src_url['host'] ) || ! isset( $site_url['host'] ) || $src_url['host'] === $site_url['host'] ) {
-		if ( ! isset( $site_url['path'] ) ) {
-			$relative = trim( $src_url['path'], '/' );
-		} elseif ( str_starts_with( $src_url['path'], trailingslashit( $site_url['path'] ) ) ) {
-			// Make the src relative to the WP root.
-			$relative = substr( $src_url['path'], strlen( $site_url['path'] ) );
-			$relative = trim( $relative, '/' );
-		}
-	}
-
-	/**
-	 * Filters the relative path of script module source used for finding translation files.
-	 *
-	 * @since 7.0.0
-	 *
-	 * @param string|false $relative The relative path of the script module source. False if it could not be determined.
-	 * @param string       $src      The full source URL of the script module.
-	 */
-	$relative = apply_filters( 'load_script_module_textdomain_relative_path', $relative, $src );
-
-	// If the source is not from WP.
-	if ( false === $relative ) {
-		return load_script_translations( false, $id, $domain );
-	}
-
-	// Translations are always based on the unminified filename.
-	if ( str_ends_with( $relative, '.min.js' ) ) {
-		$relative = substr( $relative, 0, -7 ) . '.js';
-	}
-
-	$md5_filename = $file_base . '-' . md5( $relative ) . '.json';
-
-	if ( $path ) {
-		$translations = load_script_translations( $path . '/' . $md5_filename, $id, $domain );
-
-		if ( $translations ) {
-			return $translations;
-		}
-	}
-
-	$translations = load_script_translations( $languages_path . '/' . $md5_filename, $id, $domain );
-
-	if ( $translations ) {
-		return $translations;
-	}
-
-	return load_script_translations( false, $id, $domain );
+	return _load_script_textdomain_from_src( $id, $src, $domain, $path, 'load_script_module_textdomain_relative_path' );
 }
 
 /**