function theme_get_suggestions

Generate an array of suggestions from path arguments.

This is typically called for adding to the suggestions in hook_theme_suggestions_HOOK_alter() or adding to 'attributes' class key variables from within preprocess functions, when wanting to base the additional suggestions or classes on the path of the current page.

Parameters

$args: An array of path arguments.

$base: A string identifying the base 'thing' from which more specific suggestions are derived. For example, 'page' or 'html'.

$delimiter: The string used to delimit increasingly specific information. The default of '__' is appropriate for theme hook suggestions. '-' is appropriate for extra classes.

Return value

array An array of suggestions, suitable for adding to hook_theme_suggestions_HOOK_alter() or to $variables['attributes']['class'] if the suggestions represent extra CSS classes.

File

core/includes/theme.inc, line 1263

Code

function theme_get_suggestions($args, $base, $delimiter = '__') {
    // Build a list of suggested theme hooks in order of
    // specificity. One suggestion is made for every element of the current path,
    // though numeric elements are not carried to subsequent suggestions. For
    // example, for $base='page', http://www.example.com/node/1/edit would result
    // in the following suggestions:
    //
    // page__node
    // page__node__%
    // page__node__1
    // page__node__edit
    $suggestions = [];
    $prefix = $base;
    foreach ($args as $arg) {
        // Remove slashes or null per SA-CORE-2009-003 and change - (hyphen) to _
        // (underscore).
        //
        // When we discover templates in @see drupal_find_theme_templates,
        // hyphens (-) are converted to underscores (_) before the theme hook
        // is registered. We do this because the hyphens used for delimiters
        // in hook suggestions cannot be used in the function names of the
        // associated preprocess functions. Any page templates designed to be used
        // on paths that contain a hyphen are also registered with these hyphens
        // converted to underscores so here we must convert any hyphens in path
        // arguments to underscores here before fetching theme hook suggestions
        // to ensure the templates are appropriately recognized.
        $arg = str_replace([
            "/",
            "\\",
            "\x00",
            '-',
        ], [
            '',
            '',
            '',
            '_',
        ], $arg);
        // The percent acts as a wildcard for numeric arguments since
        // asterisks are not valid filename characters on many filesystems.
        if (is_numeric($arg)) {
            $suggestions[] = $prefix . $delimiter . '%';
        }
        $suggestions[] = $prefix . $delimiter . $arg;
        if (!is_numeric($arg)) {
            $prefix .= $delimiter . $arg;
        }
    }
    if (\Drupal::service('path.matcher')->isFrontPage()) {
        // Front templates should be based on root only, not prefixed arguments.
        $suggestions[] = $base . $delimiter . 'front';
    }
    return $suggestions;
}