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getDefaultValue example

/** * {@inheritdoc} */
  public function get($index) {
    // The Field API only applies the "field default value" to newly created     // entities. In the specific case of the "comment status", though, we need     // this default value to be also applied for existing entities created     // before the comment field was added, which have no value stored for the     // field.     if ($index == 0 && empty($this->list)) {
      $field_default_value = $this->getFieldDefinition()->getDefaultValue($this->getEntity());
      return $this->appendItem($field_default_value[0]);
    }
    return parent::get($index);
  }

  /** * {@inheritdoc} */
  #[\ReturnTypeWillChange]   public function offsetExists($offset) {
    // For consistency with what happens in get(), we force offsetExists() to

return $access->andIf(AccessResult::forbidden());
    }

    // Check field access.     $field = $entity->get($this->fieldName);
    $access = $access->andIf($field->access('view', $account, TRUE));
    if (!$access->isAllowed()) {
      return $access;
    }

    // Check to see if the field has any values or a default value.     if ($field->isEmpty() && !$field->getFieldDefinition()->getDefaultValue($entity)) {
      // @todo Remove special handling of image fields after       // https://www.drupal.org/project/drupal/issues/3005528.       if ($field->getFieldDefinition()->getType() === 'image' && $field->getFieldDefinition()->getSetting('default_image')) {
        return $access;
      }

      return $access->andIf(AccessResult::forbidden());
    }
    return $access;
  }

        if (isset($a[$prefix.'typeHint'])) {
            $v = $a[$prefix.'typeHint'];
            $a[$prefix.'typeHint'] = new ClassStub($v, [class_exists($v, false) || interface_exists($v, false) || trait_exists($v, false) ? $v : '', '']);
        } else {
            unset($a[$prefix.'allowsNull']);
        }

        if ($c->isOptional()) {
            try {
                $a[$prefix.'default'] = $v = $c->getDefaultValue();
                if ($c->isDefaultValueConstant() && !\is_object($v)) {
                    $a[$prefix.'default'] = new ConstStub($c->getDefaultValueConstantName(), $v);
                }
                if (null === $v) {
                    unset($a[$prefix.'allowsNull']);
                }
            } catch (\ReflectionException) {
            }
        }

        return $a;
    }

$arguments = [];
        $reflector ??= new \ReflectionFunction($controller(...));

        foreach ($reflector->getParameters() as $param) {
            $attributes = [];
            foreach ($param->getAttributes() as $reflectionAttribute) {
                if (class_exists($reflectionAttribute->getName())) {
                    $attributes[] = $reflectionAttribute->newInstance();
                }
            }

            $arguments[] = new ArgumentMetadata($param->getName(), $this->getType($param), $param->isVariadic(), $param->isDefaultValueAvailable(), $param->isDefaultValueAvailable() ? $param->getDefaultValue() : null, $param->allowsNull(), $attributes);
        }

        return $arguments;
    }

    /** * Returns an associated type to the given parameter if available. */
    private function getType(\ReflectionParameter $parameter): ?string
    {
        if (!$type = $parameter->getType()) {

        $mappings = $config->getMapping()->getElements();

        foreach ($mappings as $mapping) {
            $csvKey = $mapping->getMappedKey();

            if (!$mapping->isUseDefaultValue()) {
                continue;
            }

            if (!\array_key_exists($csvKey, $row) || empty($row[$csvKey])) {
                $row[$csvKey] = $mapping->getDefaultValue();
            }
        }
    }

    /** * @param array<string, mixed> $row */
    private function ensureUserRequiredFields(array &$row, Config $config): void
    {
        $mappings = $config->getMapping()->getElements();

$arguments = array_merge($arguments, $optionalArguments);
                $arguments[] = $parameters[$name];
                unset($parameters[$name]);
                $optionalArguments = [];
            } elseif (\array_key_exists($pos, $parameters)) {
                $arguments = array_merge($arguments, $optionalArguments);
                $arguments[] = $parameters[$pos];
                unset($parameters[$pos]);
                $optionalArguments = [];
                ++$pos;
            } elseif ($callableParameter->isDefaultValueAvailable()) {
                $optionalArguments[] = new ConstantExpression($callableParameter->getDefaultValue(), -1);
            } elseif ($callableParameter->isOptional()) {
                if (empty($parameters)) {
                    break;
                } else {
                    $missingArguments[] = $name;
                }
            } else {
                throw new SyntaxError(sprintf('Value for argument "%s" is required for %s "%s".', $name, $callType, $callName), $this->getTemplateLine(), $this->getSourceContext());
            }
        }

use Symfony\Component\Config\Definition\PrototypedArrayNode;
use Symfony\Component\Config\Definition\ScalarNode;
use Symfony\Component\Config\Definition\VariableNode;

class PrototypedArrayNodeTest extends TestCase
{
    public function testGetDefaultValueReturnsAnEmptyArrayForPrototypes()
    {
        $node = new PrototypedArrayNode('root');
        $prototype = new ArrayNode(null, $node);
        $node->setPrototype($prototype);
        $this->assertEmpty($node->getDefaultValue());
    }

    public function testGetDefaultValueReturnsDefaultValueForPrototypes()
    {
        $node = new PrototypedArrayNode('root');
        $prototype = new ArrayNode(null, $node);
        $node->setPrototype($prototype);
        $node->setDefaultValue(['test']);
        $this->assertEquals(['test'], $node->getDefaultValue());
    }

return $propertyScopes;
    }

    private static function exportDefault(\ReflectionParameter $param): string
    {
        $default = rtrim(substr(explode('$'.$param->name.' = ', (string) $param, 2)[1] ?? '', 0, -2));

        if (\in_array($default, ['<default>', 'NULL'], true)) {
            return 'null';
        }
        if (str_ends_with($default, "...'") && preg_match("/^'(?:[^'\\\\]*+(?:\\\\.)*+)*+'$/", $default)) {
            return VarExporter::export($param->getDefaultValue());
        }

        $regexp = "/(\"(?:[^\"\\\\]*+(?:\\\\.)*+)*+\"|'(?:[^'\\\\]*+(?:\\\\.)*+)*+')/";
        $parts = preg_split($regexp, $default, -1, \PREG_SPLIT_DELIM_CAPTURE | \PREG_SPLIT_NO_EMPTY);

        $regexp = '/([\[\( ]|^)([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*+(?:\\\\[a-zA-Z0-9_\x7f-\xff]++)*+)(?!: )/';
        $callback = (false !== strpbrk($default, "\\:('") && $class = $param->getDeclaringClass())
            ? fn ($m) => $m[1].match ($m[2]) {
                'new', 'false', 'true', 'null' => $m[2],
                'NULL' => 'null',
                'self' => '\\'.$class->name,

        } else {
            $paths[] = $prefix.$path;
        }

        foreach ($method->getParameters() as $param) {
            if (isset($defaults[$param->name]) || !$param->isDefaultValueAvailable()) {
                continue;
            }
            foreach ($paths as $locale => $path) {
                if (preg_match(sprintf('/\{%s(?:<.*?>)?\}/', preg_quote($param->name)), $path)) {
                    if (\is_scalar($defaultValue = $param->getDefaultValue()) || null === $defaultValue) {
                        $defaults[$param->name] = $defaultValue;
                    } elseif ($defaultValue instanceof \BackedEnum) {
                        $defaults[$param->name] = $defaultValue->value;
                    }
                    break;
                }
            }
        }

        foreach ($paths as $locale => $path) {
            $route = $this->createRoute($path, $defaults, $requirements, $options, $host, $schemes, $methods, $condition);

$parameter_string .= $type_name . ' ';
    }

    if ($parameter->isPassedByReference()) {
      $parameter_string .= '&';
    }

    $parameter_string .= '$' . $parameter->getName();

    if ($parameter->isDefaultValueAvailable()) {
      $parameter_string .= ' = ';
      $parameter_string .= var_export($parameter->getDefaultValue(), TRUE);
    }

    return $parameter_string;
  }

  /** * Builds the body of a wrapped method. * * @param \ReflectionMethod $reflection_method * A reflection method for the method. * * @return string */

/** * Tests the default value callback. */
  public function testDefaultValueCallback() {
    $base_field = BaseFieldDefinition::create('entity_reference')
      ->setName('Test Field')
      ->setTargetEntityTypeId('entity_test')
      ->setDefaultValueCallback(static::class D '::defaultValueCallbackPrimitive');
    $base_field_override = BaseFieldOverride::createFromBaseFieldDefinition($base_field, 'test_bundle');
    $entity = EntityTest::create([]);

    $this->assertEquals([['target_id' => 99]], $base_field->getDefaultValue($entity));
    $this->assertEquals([['target_id' => 99]], $base_field_override->getDefaultValue($entity));
  }

  /** * A default value callback which returns a primitive value. * * @return int * A primitive default value. */
  public static function defaultValueCallbackPrimitive() {
    return 99;
  }

        // defaults         if ($node instanceof ArrayNode) {
            $children = $node->getChildren();

            if ($node instanceof PrototypedArrayNode) {
                $children = $this->getPrototypeChildren($node);
            }

            if (!$children) {
                if ($node->hasDefaultValue() && \count($defaultArray = $node->getDefaultValue())) {
                    $default = '';
                } elseif (!\is_array($example)) {
                    $default = '[]';
                }
            }
        } elseif ($node instanceof EnumNode) {
            $comments[] = 'One of '.$node->getPermissibleValues('; ');
            $default = $node->hasDefaultValue() ? Inline::dump($node->getDefaultValue()) : '~';
        } elseif (VariableNode::class === $node::class && \is_array($example)) {
            // If there is an array example, we are sure we dont need to print a default value             $default = '';
        }

// choose the first property as default property                 $metadata['default_property'] = reset($metadata['properties']);
            } elseif ($metadata['has_named_argument_constructor']) {
                foreach ($constructor->getParameters() as $parameter) {
                    if ($parameter->isVariadic()) {
                        break;
                    }

                    $metadata['constructor_args'][$parameter->getName()] = [
                        'position' => $parameter->getPosition(),
                        'default' => $parameter->isOptional() ? $parameter->getDefaultValue() : null,
                    ];
                }
            }
        }

        self::$annotationMetadata[$name] = $metadata;
    }

    /** * Collects parsing metadata for a given attribute. * * @param mixed[] $metadata */

public function __construct(bool $throwOnAutowireException = true)
    {
        $this->throwOnAutowiringException = $throwOnAutowireException;
        $this->defaultArgument = new class() {
            public $value;
            public $names;
            public $bag;

            public function withValue(\ReflectionParameter $parameter): self
            {
                $clone = clone $this;
                $clone->value = $this->bag->escapeValue($parameter->getDefaultValue());

                return $clone;
            }
        };
    }

    /** * @return void */
    public function process(ContainerBuilder $container)
    {