RendererRecursionTest.php

<?php

namespace Drupal\Tests\Core\Render;


/**
 * @coversDefaultClass \Drupal\Core\Render\Renderer
 * @group Render
 */
class RendererRecursionTest extends RendererTestBase {
    protected function setUpRenderRecursionComplexElements() {
        $complex_child_markup = '<p>Imagine this is a render array for an entity.</p>';
        $parent_markup = '<p>Rendered!</p>';
        $complex_child_template = [
            '#cache' => [
                'tags' => [
                    'test:complex_child',
                ],
            ],
            '#lazy_builder' => [
                'Drupal\\Tests\\Core\\Render\\PlaceholdersTest::callback',
                [
                    $this->getRandomGenerator()
                        ->string(),
                ],
            ],
            '#create_placeholder' => TRUE,
        ];
        return [
            $complex_child_markup,
            $parent_markup,
            $complex_child_template,
        ];
    }
    
    /**
     * ::renderRoot() may not be called inside of another ::renderRoot() call.
     *
     * @covers ::renderRoot
     * @covers ::render
     * @covers ::doRender
     */
    public function testRenderRecursionWithNestedRenderRoot() {
        [
            $complex_child_markup,
            $parent_markup,
            $complex_child_template,
        ] = $this->setUpRenderRecursionComplexElements();
        $renderer = $this->renderer;
        $this->setUpRequest();
        $complex_child = $complex_child_template;
        $callable = function () use ($renderer, $complex_child) {
            $this->expectException(\LogicException::class);
            $renderer->renderRoot($complex_child);
        };
        $page = [
            'content' => [
                '#pre_render' => [
                    $callable,
                ],
                '#suffix' => $parent_markup,
            ],
        ];
        $renderer->renderRoot($page);
    }
    
    /**
     * ::render() may be called from anywhere.
     *
     * Including from inside of another ::renderRoot() call. Bubbling must be
     * performed.
     *
     * @covers ::renderRoot
     * @covers ::render
     * @covers ::doRender
     */
    public function testRenderRecursionWithNestedRender() {
        [
            $complex_child_markup,
            $parent_markup,
            $complex_child_template,
        ] = $this->setUpRenderRecursionComplexElements();
        $renderer = $this->renderer;
        $this->setUpRequest();
        $callable = function ($markup) use ($renderer, $complex_child_template) {
            $this->assertStringStartsWith('<drupal-render-placeholder', $markup, 'Rendered complex child output as expected, without the placeholder replaced, i.e. with just the placeholder.');
            return $markup;
        };
        $page = [
            'content' => [
                'complex_child' => $complex_child_template,
                '#post_render' => [
                    $callable,
                ],
                '#suffix' => $parent_markup,
            ],
        ];
        $output = $renderer->renderRoot($page);
        $this->assertEquals('<p>This is a rendered placeholder!</p><p>Rendered!</p>', $output, 'Rendered output as expected, with the placeholder replaced.');
        $this->assertContains('test:complex_child', $page['#cache']['tags'], 'Cache tag bubbling performed.');
        $this->assertContains('dynamic_animal', array_keys($page['#attached']['drupalSettings']), 'Asset bubbling performed.');
    }
    
    /**
     * ::renderPlain() may be called from anywhere.
     *
     * Including from inside of another ::renderRoot() call.
     *
     * @covers ::renderRoot
     * @covers ::renderPlain
     */
    public function testRenderRecursionWithNestedRenderPlain() {
        [
            $complex_child_markup,
            $parent_markup,
            $complex_child_template,
        ] = $this->setUpRenderRecursionComplexElements();
        $renderer = $this->renderer;
        $this->setUpRequest();
        $complex_child = $complex_child_template;
        $callable = function ($elements) use ($renderer, $complex_child, $parent_markup) {
            $elements['#markup'] = $renderer->renderPlain($complex_child);
            $this->assertEquals('<p>This is a rendered placeholder!</p>', $elements['#markup'], 'Rendered complex child output as expected, with the placeholder replaced.');
            return $elements;
        };
        $page = [
            'content' => [
                '#pre_render' => [
                    $callable,
                ],
                '#suffix' => $parent_markup,
            ],
        ];
        $output = $renderer->renderRoot($page);
        $this->assertEquals('<p>This is a rendered placeholder!</p>' . $parent_markup, $output, 'Rendered output as expected, with the placeholder replaced.');
        $this->assertNotContains('test:complex_child', $page['#cache']['tags'], 'Cache tag bubbling not performed.');
        $this->assertEmpty($page['#attached'], 'Asset bubbling not performed.');
    }

}