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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Form;
use Symfony\Component\Form\Exception\RuntimeException;
use Symfony\Component\Form\Exception\UnexpectedTypeException;
use Symfony\Component\Form\Exception\AlreadySubmittedException;
use Symfony\Component\Form\Exception\TransformationFailedException;
use Symfony\Component\Form\Exception\LogicException;
use Symfony\Component\Form\Exception\OutOfBoundsException;
use Symfony\Component\Form\Util\FormUtil;
use Symfony\Component\Form\Util\InheritDataAwareIterator;
use Symfony\Component\Form\Util\OrderedHashMap;
use Symfony\Component\PropertyAccess\PropertyPath;
/**
* Form represents a form.
*
* To implement your own form fields, you need to have a thorough understanding
* of the data flow within a form. A form stores its data in three different
* representations:
*
* (1) the "model" format required by the form's object
* (2) the "normalized" format for internal processing
* (3) the "view" format used for display
*
* A date field, for example, may store a date as "Y-m-d" string (1) in the
* object. To facilitate processing in the field, this value is normalized
* to a DateTime object (2). In the HTML representation of your form, a
* localized string (3) is presented to and modified by the user.
*
* In most cases, format (1) and format (2) will be the same. For example,
* a checkbox field uses a Boolean value for both internal processing and
* storage in the object. In these cases you simply need to set a value
* transformer to convert between formats (2) and (3). You can do this by
* calling addViewTransformer().
*
* In some cases though it makes sense to make format (1) configurable. To
* demonstrate this, let's extend our above date field to store the value
* either as "Y-m-d" string or as timestamp. Internally we still want to
* use a DateTime object for processing. To convert the data from string/integer
* to DateTime you can set a normalization transformer by calling
* addNormTransformer(). The normalized data is then converted to the displayed
* data as described before.
*
* The conversions (1) -> (2) -> (3) use the transform methods of the transformers.
* The conversions (3) -> (2) -> (1) use the reverseTransform methods of the transformers.
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class Form implements \IteratorAggregate, FormInterface
{
/**
* The form's configuration
* @var FormConfigInterface
*/
private $config;
/**
* The parent of this form
* @var FormInterface
*/
private $parent;
/**
* The children of this form
* @var FormInterface[] A map of FormInterface instances
*/
private $children;
/**
* The errors of this form
* @var FormError[] An array of FormError instances
*/
private $errors = array();
/**
* Whether this form was submitted
* @var Boolean
*/
private $submitted = false;
/**
* The button that was used to submit the form
* @var Button
*/
private $clickedButton;
/**
* The form data in model format
* @var mixed
*/
private $modelData;
/**
* The form data in normalized format
* @var mixed
*/
private $normData;
/**
* The form data in view format
* @var mixed
*/
private $viewData;
/**
* The submitted values that don't belong to any children
* @var array
*/
private $extraData = array();
/**
* Whether the data in model, normalized and view format is
* synchronized. Data may not be synchronized if transformation errors
* occur.
* @var Boolean
*/
private $synchronized = true;
/**
* Whether the form's data has been initialized.
*
* When the data is initialized with its default value, that default value
* is passed through the transformer chain in order to synchronize the
* model, normalized and view format for the first time. This is done
* lazily in order to save performance when {@link setData()} is called
* manually, making the initialization with the configured default value
* superfluous.
*
* @var Boolean
*/
private $defaultDataSet = false;
/**
* Whether setData() is currently being called.
* @var Boolean
*/
private $lockSetData = false;
/**
* Creates a new form based on the given configuration.
*
* @param FormConfigInterface $config The form configuration.
*
* @throws LogicException if a data mapper is not provided for a compound form
*/
public function __construct(FormConfigInterface $config)
{
// Compound forms always need a data mapper, otherwise calls to
// `setData` and `add` will not lead to the correct population of
// the child forms.
if ($config->getCompound() && !$config->getDataMapper()) {
throw new LogicException('Compound forms need a data mapper');
}
// If the form inherits the data from its parent, it is not necessary
// to call setData() with the default data.
if ($config->getInheritData()) {
$this->defaultDataSet = true;
}
$this->config = $config;
$this->children = new OrderedHashMap();
}
public function __clone()
{
$this->children = clone $this->children;
foreach ($this->children as $key => $child) {
$this->children[$key] = clone $child;
}
}
/**
* {@inheritdoc}
*/
public function getConfig()
{
return $this->config;
}
/**
* {@inheritdoc}
*/
public function getName()
{
return $this->config->getName();
}
/**
* {@inheritdoc}
*/
public function getPropertyPath()
{
if (null !== $this->config->getPropertyPath()) {
return $this->config->getPropertyPath();
}
if (null === $this->getName() || '' === $this->getName()) {
return null;
}
$parent = $this->parent;
while ($parent && $parent->getConfig()->getInheritData()) {
$parent = $parent->getParent();
}
if ($parent && null === $parent->getConfig()->getDataClass()) {
return new PropertyPath('['.$this->getName().']');
}
return new PropertyPath($this->getName());
}
/**
* {@inheritdoc}
*/
public function isRequired()
{
if (null === $this->parent || $this->parent->isRequired()) {
return $this->config->getRequired();
}
return false;
}
/**
* {@inheritDoc}
*/
public function isDisabled()
{
if (null === $this->parent || !$this->parent->isDisabled()) {
return $this->config->getDisabled();
}
return true;
}
/**
* {@inheritdoc}
*/
public function setParent(FormInterface $parent = null)
{
if ($this->submitted) {
throw new AlreadySubmittedException('You cannot set the parent of a submitted form');
}
if (null !== $parent && '' === $this->config->getName()) {
throw new LogicException('A form with an empty name cannot have a parent form.');
}
$this->parent = $parent;
return $this;
}
/**
* {@inheritdoc}
*/
public function getParent()
{
return $this->parent;
}
/**
* {@inheritdoc}
*/
public function getRoot()
{
return $this->parent ? $this->parent->getRoot() : $this;
}
/**
* {@inheritdoc}
*/
public function isRoot()
{
return null === $this->parent;
}
/**
* {@inheritdoc}
*/
public function setData($modelData)
{
// If the form is submitted while disabled, it is set to submitted, but the data is not
// changed. In such cases (i.e. when the form is not initialized yet) don't
// abort this method.
if ($this->submitted && $this->defaultDataSet) {
throw new AlreadySubmittedException('You cannot change the data of a submitted form.');
}
// If the form inherits its parent's data, disallow data setting to
// prevent merge conflicts
if ($this->config->getInheritData()) {
throw new RuntimeException('You cannot change the data of a form inheriting its parent data.');
}
// Don't allow modifications of the configured data if the data is locked
if ($this->config->getDataLocked() && $modelData !== $this->config->getData()) {
return $this;
}
if (is_object($modelData) && !$this->config->getByReference()) {
$modelData = clone $modelData;
}
if ($this->lockSetData) {
throw new RuntimeException('A cycle was detected. Listeners to the PRE_SET_DATA event must not call setData(). You should call setData() on the FormEvent object instead.');
}
$this->lockSetData = true;
$dispatcher = $this->config->getEventDispatcher();
// Hook to change content of the data
if ($dispatcher->hasListeners(FormEvents::PRE_SET_DATA)) {
$event = new FormEvent($this, $modelData);
$dispatcher->dispatch(FormEvents::PRE_SET_DATA, $event);
$modelData = $event->getData();
}
// Treat data as strings unless a value transformer exists
if (!$this->config->getViewTransformers() && !$this->config->getModelTransformers() && is_scalar($modelData)) {
$modelData = (string) $modelData;
}
// Synchronize representations - must not change the content!
$normData = $this->modelToNorm($modelData);
$viewData = $this->normToView($normData);
// Validate if view data matches data class (unless empty)
if (!FormUtil::isEmpty($viewData)) {
$dataClass = $this->config->getDataClass();
$actualType = is_object($viewData) ? 'an instance of class '.get_class($viewData) : ' a(n) '.gettype($viewData);
if (null === $dataClass && is_object($viewData) && !$viewData instanceof \ArrayAccess) {
$expectedType = 'scalar, array or an instance of \ArrayAccess';
throw new LogicException(
'The form\'s view data is expected to be of type '.$expectedType.', ' .
'but is '.$actualType.'. You ' .
'can avoid this error by setting the "data_class" option to ' .
'"'.get_class($viewData).'" or by adding a view transformer ' .
'that transforms '.$actualType.' to '.$expectedType.'.'
);
}
if (null !== $dataClass && !$viewData instanceof $dataClass) {
throw new LogicException(
'The form\'s view data is expected to be an instance of class ' .
$dataClass.', but is '. $actualType.'. You can avoid this error ' .
'by setting the "data_class" option to null or by adding a view ' .
'transformer that transforms '.$actualType.' to an instance of ' .
$dataClass.'.'
);
}
}
$this->modelData = $modelData;
$this->normData = $normData;
$this->viewData = $viewData;
$this->defaultDataSet = true;
$this->lockSetData = false;
// It is not necessary to invoke this method if the form doesn't have children,
// even if the form is compound.
if (count($this->children) > 0) {
// Update child forms from the data
$iterator = new InheritDataAwareIterator($this->children);
$iterator = new \RecursiveIteratorIterator($iterator);
$this->config->getDataMapper()->mapDataToForms($viewData, $iterator);
}
if ($dispatcher->hasListeners(FormEvents::POST_SET_DATA)) {
$event = new FormEvent($this, $modelData);
$dispatcher->dispatch(FormEvents::POST_SET_DATA, $event);
}
return $this;
}
/**
* {@inheritdoc}
*/
public function getData()
{
if ($this->config->getInheritData()) {
if (!$this->parent) {
throw new RuntimeException('The form is configured to inherit its parent\'s data, but does not have a parent.');
}
return $this->parent->getData();
}
if (!$this->defaultDataSet) {
$this->setData($this->config->getData());
}
return $this->modelData;
}
/**
* {@inheritdoc}
*/
public function getNormData()
{
if ($this->config->getInheritData()) {
if (!$this->parent) {
throw new RuntimeException('The form is configured to inherit its parent\'s data, but does not have a parent.');
}
return $this->parent->getNormData();
}
if (!$this->defaultDataSet) {
$this->setData($this->config->getData());
}
return $this->normData;
}
/**
* {@inheritdoc}
*/
public function getViewData()
{
if ($this->config->getInheritData()) {
if (!$this->parent) {
throw new RuntimeException('The form is configured to inherit its parent\'s data, but does not have a parent.');
}
return $this->parent->getViewData();
}
if (!$this->defaultDataSet) {
$this->setData($this->config->getData());
}
return $this->viewData;
}
/**
* {@inheritdoc}
*/
public function getExtraData()
{
return $this->extraData;
}
/**
* {@inheritdoc}
*/
public function initialize()
{
if (null !== $this->parent) {
throw new RuntimeException('Only root forms should be initialized.');
}
// Guarantee that the *_SET_DATA events have been triggered once the
// form is initialized. This makes sure that dynamically added or
// removed fields are already visible after initialization.
if (!$this->defaultDataSet) {
$this->setData($this->config->getData());
}
return $this;
}
/**
* {@inheritdoc}
*/
public function handleRequest($request = null)
{
$this->config->getRequestHandler()->handleRequest($this, $request);
return $this;
}
/**
* {@inheritdoc}
*/
public function submit($submittedData, $clearMissing = true)
{
if ($this->submitted) {
throw new AlreadySubmittedException('A form can only be submitted once');
}
// Initialize errors in the very beginning so that we don't lose any
// errors added during listeners
$this->errors = array();
// Obviously, a disabled form should not change its data upon submission.
if ($this->isDisabled()) {
$this->submitted = true;
return $this;
}
// The data must be initialized if it was not initialized yet.
// This is necessary to guarantee that the *_SET_DATA listeners
// are always invoked before submit() takes place.
if (!$this->defaultDataSet) {
$this->setData($this->config->getData());
}
// Treat false as NULL to support binding false to checkboxes.
// Don't convert NULL to a string here in order to determine later
// whether an empty value has been submitted or whether no value has
// been submitted at all. This is important for processing checkboxes
// and radio buttons with empty values.
if (false === $submittedData) {
$submittedData = null;
} elseif (is_scalar($submittedData)) {
$submittedData = (string) $submittedData;
}
$dispatcher = $this->config->getEventDispatcher();
$modelData = null;
$normData = null;
$viewData = null;
try {
// Hook to change content of the data submitted by the browser
if ($dispatcher->hasListeners(FormEvents::PRE_SUBMIT)) {
$event = new FormEvent($this, $submittedData);
$dispatcher->dispatch(FormEvents::PRE_SUBMIT, $event);
$submittedData = $event->getData();
}
// Check whether the form is compound.
// This check is preferable over checking the number of children,
// since forms without children may also be compound.
// (think of empty collection forms)
if ($this->config->getCompound()) {
if (null === $submittedData) {
$submittedData = array();
}
if (!is_array($submittedData)) {
throw new TransformationFailedException('Compound forms expect an array or NULL on submission.');
}
foreach ($this->children as $name => $child) {
if (array_key_exists($name, $submittedData) || $clearMissing) {
$child->submit(isset($submittedData[$name]) ? $submittedData[$name] : null, $clearMissing);
unset($submittedData[$name]);
if (null !== $this->clickedButton) {
continue;
}
if ($child instanceof ClickableInterface && $child->isClicked()) {
$this->clickedButton = $child;
continue;
}
if (method_exists($child, 'getClickedButton') && null !== $child->getClickedButton()) {
$this->clickedButton = $child->getClickedButton();
}
}
}
$this->extraData = $submittedData;
}
// Forms that inherit their parents' data also are not processed,
// because then it would be too difficult to merge the changes in
// the child and the parent form. Instead, the parent form also takes
// changes in the grandchildren (i.e. children of the form that inherits
// its parent's data) into account.
// (see InheritDataAwareIterator below)
if (!$this->config->getInheritData()) {
// If the form is compound, the default data in view format
// is reused. The data of the children is merged into this
// default data using the data mapper.
// If the form is not compound, the submitted data is also the data in view format.
$viewData = $this->config->getCompound() ? $this->viewData : $submittedData;
if (FormUtil::isEmpty($viewData)) {
$emptyData = $this->config->getEmptyData();
if ($emptyData instanceof \Closure) {
/* @var \Closure $emptyData */
$emptyData = $emptyData($this, $viewData);
}
$viewData = $emptyData;
}
// Merge form data from children into existing view data
// It is not necessary to invoke this method if the form has no children,
// even if it is compound.
if (count($this->children) > 0) {
// Use InheritDataAwareIterator to process children of
// descendants that inherit this form's data.
// These descendants will not be submitted normally (see the check
// for $this->config->getInheritData() above)
$childrenIterator = new InheritDataAwareIterator($this->children);
$childrenIterator = new \RecursiveIteratorIterator($childrenIterator);
$this->config->getDataMapper()->mapFormsToData($childrenIterator, $viewData);
}
// Normalize data to unified representation
$normData = $this->viewToNorm($viewData);
// Hook to change content of the data in the normalized
// representation
if ($dispatcher->hasListeners(FormEvents::SUBMIT)) {
$event = new FormEvent($this, $normData);
$dispatcher->dispatch(FormEvents::SUBMIT, $event);
$normData = $event->getData();
}
// Synchronize representations - must not change the content!
$modelData = $this->normToModel($normData);
$viewData = $this->normToView($normData);
}
} catch (TransformationFailedException $e) {
$this->synchronized = false;
// If $viewData was not yet set, set it to $submittedData so that
// the erroneous data is accessible on the form.
// Forms that inherit data never set any data, because the getters
// forward to the parent form's getters anyway.
if (null === $viewData && !$this->config->getInheritData()) {
$viewData = $submittedData;
}
}
$this->submitted = true;
$this->modelData = $modelData;
$this->normData = $normData;
$this->viewData = $viewData;
if ($dispatcher->hasListeners(FormEvents::POST_SUBMIT)) {
$event = new FormEvent($this, $viewData);
$dispatcher->dispatch(FormEvents::POST_SUBMIT, $event);
}
return $this;
}
/**
* Alias of {@link submit()}.
*
* @deprecated Deprecated since version 2.3, to be removed in 3.0. Use
* {@link submit()} instead.
*/
public function bind($submittedData)
{
return $this->submit($submittedData);
}
/**
* {@inheritdoc}
*/
public function addError(FormError $error)
{
if ($this->parent && $this->config->getErrorBubbling()) {
$this->parent->addError($error);
} else {
$this->errors[] = $error;
}
return $this;
}
/**
* {@inheritdoc}
*/
public function isSubmitted()
{
return $this->submitted;
}
/**
* Alias of {@link isSubmitted()}.
*
* @deprecated Deprecated since version 2.3, to be removed in 3.0. Use
* {@link isSubmitted()} instead.
*/
public function isBound()
{
return $this->submitted;
}
/**
* {@inheritdoc}
*/
public function isSynchronized()
{
return $this->synchronized;
}
/**
* {@inheritdoc}
*/
public function isEmpty()
{
foreach ($this->children as $child) {
if (!$child->isEmpty()) {
return false;
}
}
return FormUtil::isEmpty($this->modelData) ||
// arrays, countables
0 === count($this->modelData) ||
// traversables that are not countable
($this->modelData instanceof \Traversable && 0 === iterator_count($this->modelData));
}
/**
* {@inheritdoc}
*/
public function isValid()
{
if (!$this->submitted) {
return false;
}
if (count($this->errors) > 0) {
return false;
}
if ($this->isDisabled()) {
return true;
}
foreach ($this->children as $child) {
if ($child->isSubmitted() && !$child->isValid()) {
return false;
}
}
return true;
}
/**
* Returns the button that was used to submit the form.
*
* @return Button|null The clicked button or NULL if the form was not
* submitted
*/
public function getClickedButton()
{
if ($this->clickedButton) {
return $this->clickedButton;
}
if ($this->parent && method_exists($this->parent, 'getClickedButton')) {
return $this->parent->getClickedButton();
}
return null;
}
/**
* {@inheritdoc}
*/
public function getErrors()
{
return $this->errors;
}
/**
* Returns a string representation of all form errors (including children errors).
*
* This method should only be used to help debug a form.
*
* @param integer $level The indentation level (used internally)
*
* @return string A string representation of all errors
*/
public function getErrorsAsString($level = 0)
{
$errors = '';
foreach ($this->errors as $error) {
$errors .= str_repeat(' ', $level).'ERROR: '.$error->getMessage()."\n";
}
foreach ($this->children as $key => $child) {
$errors .= str_repeat(' ', $level).$key.":\n";
if ($child instanceof self && $err = $child->getErrorsAsString($level + 4)) {
$errors .= $err;
} else {
$errors .= str_repeat(' ', $level + 4)."No errors\n";
}
}
return $errors;
}
/**
* {@inheritdoc}
*/
public function all()
{
return iterator_to_array($this->children);
}
/**
* {@inheritdoc}
*/
public function add($child, $type = null, array $options = array())
{
if ($this->submitted) {
throw new AlreadySubmittedException('You cannot add children to a submitted form');
}
if (!$this->config->getCompound()) {
throw new LogicException('You cannot add children to a simple form. Maybe you should set the option "compound" to true?');
}
// Obtain the view data
$viewData = null;
// If setData() is currently being called, there is no need to call
// mapDataToForms() here, as mapDataToForms() is called at the end
// of setData() anyway. Not doing this check leads to an endless
// recursion when initializing the form lazily and an event listener
// (such as ResizeFormListener) adds fields depending on the data:
//
// * setData() is called, the form is not initialized yet
// * add() is called by the listener (setData() is not complete, so
// the form is still not initialized)
// * getViewData() is called
// * setData() is called since the form is not initialized yet
// * ... endless recursion ...
//
// Also skip data mapping if setData() has not been called yet.
// setData() will be called upon form initialization and data mapping
// will take place by then.
if (!$this->lockSetData && $this->defaultDataSet && !$this->config->getInheritData()) {
$viewData = $this->getViewData();
}
if (!$child instanceof FormInterface) {
if (!is_string($child) && !is_int($child)) {
throw new UnexpectedTypeException($child, 'string, integer or Symfony\Component\Form\FormInterface');
}
if (null !== $type && !is_string($type) && !$type instanceof FormTypeInterface) {
throw new UnexpectedTypeException($type, 'string or Symfony\Component\Form\FormTypeInterface');
}
// Never initialize child forms automatically
$options['auto_initialize'] = false;
if (null === $type) {
$child = $this->config->getFormFactory()->createForProperty($this->config->getDataClass(), $child, null, $options);
} else {
$child = $this->config->getFormFactory()->createNamed($child, $type, null, $options);
}
} elseif ($child->getConfig()->getAutoInitialize()) {
throw new RuntimeException(sprintf(
'Automatic initialization is only supported on root forms. You '.
'should set the "auto_initialize" option to false on the field "%s".',
$child->getName()
));
}
$this->children[$child->getName()] = $child;
$child->setParent($this);
if (!$this->lockSetData && $this->defaultDataSet && !$this->config->getInheritData()) {
$iterator = new InheritDataAwareIterator(new \ArrayIterator(array($child)));
$iterator = new \RecursiveIteratorIterator($iterator);
$this->config->getDataMapper()->mapDataToForms($viewData, $iterator);
}
return $this;
}
/**
* {@inheritdoc}
*/
public function remove($name)
{
if ($this->submitted) {
throw new AlreadySubmittedException('You cannot remove children from a submitted form');
}
if (isset($this->children[$name])) {
$this->children[$name]->setParent(null);
unset($this->children[$name]);
}
return $this;
}
/**
* {@inheritdoc}
*/
public function has($name)
{
return isset($this->children[$name]);
}
/**
* {@inheritdoc}
*/
public function get($name)
{
if (isset($this->children[$name])) {
return $this->children[$name];
}
throw new OutOfBoundsException(sprintf('Child "%s" does not exist.', $name));
}
/**
* Returns whether a child with the given name exists (implements the \ArrayAccess interface).
*
* @param string $name The name of the child
*
* @return Boolean
*/
public function offsetExists($name)
{
return $this->has($name);
}
/**
* Returns the child with the given name (implements the \ArrayAccess interface).
*
* @param string $name The name of the child
*
* @return FormInterface The child form
*
* @throws \OutOfBoundsException If the named child does not exist.
*/
public function offsetGet($name)
{
return $this->get($name);
}
/**
* Adds a child to the form (implements the \ArrayAccess interface).
*
* @param string $name Ignored. The name of the child is used.
* @param FormInterface $child The child to be added.
*
* @throws AlreadySubmittedException If the form has already been submitted.
* @throws LogicException When trying to add a child to a non-compound form.
*
* @see self::add()
*/
public function offsetSet($name, $child)
{
$this->add($child);
}
/**
* Removes the child with the given name from the form (implements the \ArrayAccess interface).
*
* @param string $name The name of the child to remove
*
* @throws AlreadySubmittedException If the form has already been submitted.
*/
public function offsetUnset($name)
{
$this->remove($name);
}
/**
* Returns the iterator for this group.
*
* @return \Traversable
*/
public function getIterator()
{
return $this->children;
}
/**
* Returns the number of form children (implements the \Countable interface).
*
* @return integer The number of embedded form children
*/
public function count()
{
return count($this->children);
}
/**
* {@inheritdoc}
*/
public function createView(FormView $parent = null)
{
if (null === $parent && $this->parent) {
$parent = $this->parent->createView();
}
$type = $this->config->getType();
$options = $this->config->getOptions();
// The methods createView(), buildView() and finishView() are called
// explicitly here in order to be able to override either of them
// in a custom resolved form type.
$view = $type->createView($this, $parent);
$type->buildView($view, $this, $options);
foreach ($this->children as $name => $child) {
$view->children[$name] = $child->createView($view);
}
$type->finishView($view, $this, $options);
return $view;
}
/**
* Normalizes the value if a normalization transformer is set.
*
* @param mixed $value The value to transform
*
* @return mixed
*/
private function modelToNorm($value)
{
foreach ($this->config->getModelTransformers() as $transformer) {
$value = $transformer->transform($value);
}
return $value;
}
/**
* Reverse transforms a value if a normalization transformer is set.
*
* @param string $value The value to reverse transform
*
* @return mixed
*/
private function normToModel($value)
{
$transformers = $this->config->getModelTransformers();
for ($i = count($transformers) - 1; $i >= 0; --$i) {
$value = $transformers[$i]->reverseTransform($value);
}
return $value;
}
/**
* Transforms the value if a value transformer is set.
*
* @param mixed $value The value to transform
*
* @return mixed
*/
private function normToView($value)
{
// Scalar values should be converted to strings to
// facilitate differentiation between empty ("") and zero (0).
// Only do this for simple forms, as the resulting value in
// compound forms is passed to the data mapper and thus should
// not be converted to a string before.
if (!$this->config->getViewTransformers() && !$this->config->getCompound()) {
return null === $value || is_scalar($value) ? (string) $value : $value;
}
foreach ($this->config->getViewTransformers() as $transformer) {
$value = $transformer->transform($value);
}
return $value;
}
/**
* Reverse transforms a value if a value transformer is set.
*
* @param string $value The value to reverse transform
*
* @return mixed
*/
private function viewToNorm($value)
{
$transformers = $this->config->getViewTransformers();
if (!$transformers) {
return '' === $value ? null : $value;
}
for ($i = count($transformers) - 1; $i >= 0; --$i) {
$value = $transformers[$i]->reverseTransform($value);
}
return $value;
}
}