function HelpBlock::build

File

core/modules/help/src/Plugin/Block/HelpBlock.php, line 88

Class

HelpBlock

Provides a 'Help' block.

Namespace

Code

public function build() {
    // Do not show on a 403 or 404 page.
    if ($this->request->attributes
        ->has('exception')) {
        return [];
    }
    $implementations = $this->moduleHandler
        ->getImplementations('help');
    $build = [];
    $args = [
        $this->routeMatch
            ->getRouteName(),
        $this->routeMatch,
    ];
    foreach ($implementations as $module) {
        // Don't add empty strings to $build array.
        if ($help = $this->moduleHandler
            ->invoke($module, 'help', $args)) {
            // Convert strings to #markup render arrays so that they will XSS admin
            // filtered.
            $build[] = is_array($help) ? $help : [
                '#markup' => $help,
            ];
        }
    }
    return $build;
}