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//home/villadal/www/////wp-includes      ( Reset | Go to )
File Name: theme-previews.php
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<?php
/**
 * Theme previews using the Site Editor for block themes.
 *
 * @package WordPress
 */

/**
 * Filters the blog option to return the path for the previewed theme.
 *
 * @since 6.3.0
 *
 * @param string $current_stylesheet The current theme's stylesheet or template path.
 * @return string The previewed theme's stylesheet or template path.
 */
function wp_get_theme_preview_path$current_stylesheet null ) {
    if ( ! 
current_user_can'switch_themes' ) ) {
        return 
$current_stylesheet;
    }

    
$preview_stylesheet = ! empty( $_GET['wp_theme_preview'] ) ? sanitize_text_fieldwp_unslash$_GET['wp_theme_preview'] ) ) : null;
    
$wp_theme           wp_get_theme$preview_stylesheet );
    if ( ! 
is_wp_error$wp_theme->errors() ) ) {
        if ( 
current_filter() === 'template' ) {
            
$theme_path $wp_theme->get_template();
        } else {
            
$theme_path $wp_theme->get_stylesheet();
        }

        return 
sanitize_text_field$theme_path );
    }

    return 
$current_stylesheet;
}

/**
 * Adds a middleware to `apiFetch` to set the theme for the preview.
 * This adds a `wp_theme_preview` URL parameter to API requests from the Site Editor, so they also respond as if the theme is set to the value of the parameter.
 *
 * @since 6.3.0
 */
function wp_attach_theme_preview_middleware() {
    
// Don't allow non-admins to preview themes.
    
if ( ! current_user_can'switch_themes' ) ) {
        return;
    }

    
wp_add_inline_script(
        
'wp-api-fetch',
        
sprintf(
            
'wp.apiFetch.use( wp.apiFetch.createThemePreviewMiddleware( %s ) );',
            
wp_json_encodesanitize_text_fieldwp_unslash$_GET['wp_theme_preview'] ) ) )
        ),
        
'after'
    
);
}

/**
 * Set a JavaScript constant for theme activation.
 *
 * Sets the JavaScript global WP_BLOCK_THEME_ACTIVATE_NONCE containing the nonce
 * required to activate a theme. For use within the site editor.
 *
 * @see https://github.com/WordPress/gutenberg/pull/41836
 *
 * @since 6.3.0
 * @access private
 */
function wp_block_theme_activate_nonce() {
    
$nonce_handle 'switch-theme_' wp_get_theme_preview_path();
    
?>
    <script type="text/javascript">
        window.WP_BLOCK_THEME_ACTIVATE_NONCE = <?php echo wp_json_encodewp_create_nonce$nonce_handle ) ); ?>;
    </script>
    <?php
}

/**
 * Add filters and actions to enable Block Theme Previews in the Site Editor.
 *
 * The filters and actions should be added after `pluggable.php` is included as they may
 * trigger code that uses `current_user_can()` which requires functionality from `pluggable.php`.
 *
 * @since 6.3.2
 */
function wp_initialize_theme_preview_hooks() {
    if ( ! empty( 
$_GET['wp_theme_preview'] ) ) {
        
add_filter'stylesheet''wp_get_theme_preview_path' );
        
add_filter'template''wp_get_theme_preview_path' );
        
add_action'init''wp_attach_theme_preview_middleware' );
        
add_action'admin_head''wp_block_theme_activate_nonce' );
    }
}

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