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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\Event\DataEvent;
use Symfony\Component\Form\Event\FilterDataEvent;
use Symfony\Component\Form\Exception\FormException;
use Symfony\Component\Form\Exception\UnexpectedTypeException;
use Symfony\Component\Form\Exception\TransformationFailedException;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
/**
* Form represents a form.
*
* A form is composed of a validator schema and a widget form schema.
*
* To implement your own form fields, you need to have a thorough understanding
* of the data flow within a form field. A form field stores its data in three
* different representations:
*
* (1) the format required by the form's object
* (2) a normalized format for internal processing
* (3) the 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 both for internal processing as for
* 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 appendClientTransformer().
*
* 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
* appendNormTransformer(). The normalized data is then
* converted to the displayed data as described before.
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Bernhard Schussek <bernhard.schussek@symfony.com>
*/
class Form implements \IteratorAggregate, FormInterface
{
/**
* The name of this form
* @var string
*/
private $name;
/**
* The parent of this form
* @var FormInterface
*/
private $parent;
/**
* The children of this form
* @var array An array of FormInterface instances
*/
private $children = array();
/**
* The mapper for mapping data to children and back
* @var DataMapperInterface
*/
private $dataMapper;
/**
* The errors of this form
* @var array An array of FromError instances
*/
private $errors = array();
/**
* Whether added errors should bubble up to the parent
* @var Boolean
*/
private $errorBubbling;
/**
* Whether this form is bound
* @var Boolean
*/
private $bound = false;
/**
* Whether this form may not be empty
* @var Boolean
*/
private $required;
/**
* The form data in application format
* @var mixed
*/
private $appData;
/**
* The form data in normalized format
* @var mixed
*/
private $normData;
/**
* The form data in client format
* @var mixed
*/
private $clientData;
/**
* Data used for the client data when no value is bound
* @var mixed
*/
private $emptyData = '';
/**
* The bound values that don't belong to any children
* @var array
*/
private $extraData = array();
/**
* The transformers for transforming from application to normalized format
* and back
* @var array An array of DataTransformerInterface
*/
private $normTransformers;
/**
* The transformers for transforming from normalized to client format and
* back
* @var array An array of DataTransformerInterface
*/
private $clientTransformers;
/**
* Whether the data in application, normalized and client format is
* synchronized. Data may not be synchronized if transformation errors
* occur.
* @var Boolean
*/
private $synchronized = true;
/**
* The validators attached to this form
* @var array An array of FormValidatorInterface instances
*/
private $validators;
/**
* Whether this form may only be read, but not bound
* @var Boolean
*/
private $readOnly = false;
/**
* The dispatcher for distributing events of this form
* @var Symfony\Component\EventDispatcher\EventDispatcherInterface
*/
private $dispatcher;
/**
* Key-value store for arbitrary attributes attached to this form
* @var array
*/
private $attributes;
/**
* The FormTypeInterface instances used to create this form
* @var array An array of FormTypeInterface
*/
private $types;
public function __construct($name, EventDispatcherInterface $dispatcher,
array $types = array(), array $clientTransformers = array(),
array $normTransformers = array(),
DataMapperInterface $dataMapper = null, array $validators = array(),
$required = false, $readOnly = false, $errorBubbling = false,
$emptyData = null, array $attributes = array())
{
foreach ($clientTransformers as $transformer) {
if (!$transformer instanceof DataTransformerInterface) {
throw new UnexpectedTypeException($transformer, 'Symfony\Component\Form\DataTransformerInterface');
}
}
foreach ($normTransformers as $transformer) {
if (!$transformer instanceof DataTransformerInterface) {
throw new UnexpectedTypeException($transformer, 'Symfony\Component\Form\DataTransformerInterface');
}
}
foreach ($validators as $validator) {
if (!$validator instanceof FormValidatorInterface) {
throw new UnexpectedTypeException($validator, 'Symfony\Component\Form\FormValidatorInterface');
}
}
$this->name = (string) $name;
$this->dispatcher = $dispatcher;
$this->types = $types;
$this->clientTransformers = $clientTransformers;
$this->normTransformers = $normTransformers;
$this->dataMapper = $dataMapper;
$this->validators = $validators;
$this->required = (Boolean) $required;
$this->readOnly = (Boolean) $readOnly;
$this->errorBubbling = (Boolean) $errorBubbling;
$this->emptyData = $emptyData;
$this->attributes = $attributes;
$this->setData(null);
}
public function __clone()
{
foreach ($this->children as $key => $child) {
$this->children[$key] = clone $child;
}
}
/**
* Returns the name by which the form is identified in forms.
*
* @return string The name of the form.
*/
public function getName()
{
return $this->name;
}
/**
* Returns the types used by this form.
*
* @return array An array of FormTypeInterface
*/
public function getTypes()
{
return $this->types;
}
/**
* Returns whether the form is required to be filled out.
*
* If the form has a parent and the parent is not required, this method
* will always return false. Otherwise the value set with setRequired()
* is returned.
*
* @return Boolean
*/
public function isRequired()
{
if (null === $this->parent || $this->parent->isRequired()) {
return $this->required;
}
return false;
}
/**
* Returns whether this form is read only.
*
* The content of a read-only form is displayed, but not allowed to be
* modified. The validation of modified read-only forms should fail.
*
* Fields whose parents are read-only are considered read-only regardless of
* their own state.
*
* @return Boolean
*/
public function isReadOnly()
{
if (null === $this->parent || !$this->parent->isReadOnly()) {
return $this->readOnly;
}
return true;
}
/**
* Sets the parent form.
*
* @param FormInterface $parent The parent form
*
* @return Form The current form
*/
public function setParent(FormInterface $parent = null)
{
$this->parent = $parent;
return $this;
}
/**
* Returns the parent field.
*
* @return FormInterface The parent field
*/
public function getParent()
{
return $this->parent;
}
/**
* Returns whether the form has a parent.
*
* @return Boolean
*/
public function hasParent()
{
return null !== $this->parent;
}
/**
* Returns the root of the form tree.
*
* @return FormInterface The root of the tree
*/
public function getRoot()
{
return $this->parent ? $this->parent->getRoot() : $this;
}
/**
* Returns whether the field is the root of the form tree.
*
* @return Boolean
*/
public function isRoot()
{
return !$this->hasParent();
}
/**
* Returns whether the form has an attribute with the given name.
*
* @param string $name The name of the attribute
*
* @return Boolean
*/
public function hasAttribute($name)
{
return isset($this->attributes[$name]);
}
/**
* Returns the value of the attributes with the given name.
*
* @param string $name The name of the attribute
*/
public function getAttribute($name)
{
return $this->attributes[$name];
}
/**
* Updates the field with default data.
*
* @param array $appData The data formatted as expected for the underlying object
*
* @return Form The current form
*/
public function setData($appData)
{
$event = new DataEvent($this, $appData);
$this->dispatcher->dispatch(FormEvents::PRE_SET_DATA, $event);
// Hook to change content of the data
$event = new FilterDataEvent($this, $appData);
$this->dispatcher->dispatch(FormEvents::SET_DATA, $event);
$appData = $event->getData();
// Treat data as strings unless a value transformer exists
if (!$this->clientTransformers && !$this->normTransformers && is_scalar($appData)) {
$appData = (string) $appData;
}
// Synchronize representations - must not change the content!
$normData = $this->appToNorm($appData);
$clientData = $this->normToClient($normData);
$this->appData = $appData;
$this->normData = $normData;
$this->clientData = $clientData;
$this->synchronized = true;
if ($this->dataMapper) {
// Update child forms from the data
$this->dataMapper->mapDataToForms($clientData, $this->children);
}
$event = new DataEvent($this, $appData);
$this->dispatcher->dispatch(FormEvents::POST_SET_DATA, $event);
return $this;
}
/**
* Returns the data in the format needed for the underlying object.
*
* @return mixed
*/
public function getData()
{
return $this->appData;
}
/**
* Returns the data transformed by the value transformer.
*
* @return string
*/
public function getClientData()
{
return $this->clientData;
}
/**
* Returns the extra data.
*
* @return array The bound data which do not belong to a child
*/
public function getExtraData()
{
return $this->extraData;
}
/**
* Binds data to the field, transforms and validates it.
*
* @param string|array $clientData The data
*
* @return Form The current form
*
* @throws UnexpectedTypeException
*/
public function bind($clientData)
{
if ($this->readOnly) {
$this->bound = true;
return $this;
}
if (is_scalar($clientData) || null === $clientData) {
$clientData = (string) $clientData;
}
// Initialize errors in the very beginning so that we don't lose any
// errors added during listeners
$this->errors = array();
$event = new DataEvent($this, $clientData);
$this->dispatcher->dispatch(FormEvents::PRE_BIND, $event);
$appData = null;
$normData = null;
$extraData = array();
$synchronized = false;
// Hook to change content of the data bound by the browser
$event = new FilterDataEvent($this, $clientData);
$this->dispatcher->dispatch(FormEvents::BIND_CLIENT_DATA, $event);
$clientData = $event->getData();
if (count($this->children) > 0) {
if (null === $clientData || '' === $clientData) {
$clientData = array();
}
if (!is_array($clientData)) {
throw new UnexpectedTypeException($clientData, 'array');
}
foreach ($this->children as $name => $child) {
if (!isset($clientData[$name])) {
$clientData[$name] = null;
}
}
foreach ($clientData as $name => $value) {
if ($this->has($name)) {
$this->children[$name]->bind($value);
} else {
$extraData[$name] = $value;
}
}
// If we have a data mapper, use old client data and merge
// data from the children into it later
if ($this->dataMapper) {
$clientData = $this->getClientData();
}
}
if (null === $clientData || '' === $clientData) {
$clientData = $this->emptyData;
if ($clientData instanceof \Closure) {
$clientData = $clientData($this);
}
}
// Merge form data from children into existing client data
if (count($this->children) > 0 && $this->dataMapper) {
$this->dataMapper->mapFormsToData($this->children, $clientData);
}
try {
// Normalize data to unified representation
$normData = $this->clientToNorm($clientData);
$synchronized = true;
} catch (TransformationFailedException $e) {
}
if ($synchronized) {
// Hook to change content of the data in the normalized
// representation
$event = new FilterDataEvent($this, $normData);
$this->dispatcher->dispatch(FormEvents::BIND_NORM_DATA, $event);
$normData = $event->getData();
// Synchronize representations - must not change the content!
$appData = $this->normToApp($normData);
$clientData = $this->normToClient($normData);
}
$this->bound = true;
$this->appData = $appData;
$this->normData = $normData;
$this->clientData = $clientData;
$this->extraData = $extraData;
$this->synchronized = $synchronized;
$event = new DataEvent($this, $clientData);
$this->dispatcher->dispatch(FormEvents::POST_BIND, $event);
foreach ($this->validators as $validator) {
$validator->validate($this);
}
return $this;
}
/**
* Binds a request to the form.
*
* If the request method is POST, PUT or GET, the data is bound to the form,
* transformed and written into the form data (an object or an array).
*
* @param Request $request The request to bind to the form
*
* @return Form This form
*
* @throws FormException if the method of the request is not one of GET, POST or PUT
*/
public function bindRequest(Request $request)
{
// Store the bound data in case of a post request
switch ($request->getMethod()) {
case 'POST':
case 'PUT':
$data = array_replace_recursive(
$request->request->get($this->getName(), array()),
$request->files->get($this->getName(), array())
);
break;
case 'GET':
$data = $request->query->get($this->getName(), array());
break;
default:
throw new FormException(sprintf('The request method "%s" is not supported', $request->getMethod()));
}
return $this->bind($data);
}
/**
* Returns the normalized data of the field.
*
* @return mixed When the field is not bound, the default data is returned.
* When the field is bound, the normalized bound data is
* returned if the field is valid, null otherwise.
*/
public function getNormData()
{
return $this->normData;
}
/**
* Adds an error to this form.
*
* @param FormError $error
*
* @return Form The current form
*/
public function addError(FormError $error)
{
if ($this->parent && $this->errorBubbling) {
$this->parent->addError($error);
} else {
$this->errors[] = $error;
}
return $this;
}
/**
* Returns whether errors bubble up to the parent.
*
* @return Boolean
*/
public function getErrorBubbling()
{
return $this->errorBubbling;
}
/**
* Returns whether the field is bound.
*
* @return Boolean true if the form is bound to input values, false otherwise
*/
public function isBound()
{
return $this->bound;
}
/**
* Returns whether the data in the different formats is synchronized.
*
* @return Boolean
*/
public function isSynchronized()
{
return $this->synchronized;
}
/**
* Returns whether the form is empty.
*
* @return Boolean
*/
public function isEmpty()
{
foreach ($this->children as $child) {
if (!$child->isEmpty()) {
return false;
}
}
return array() === $this->appData || null === $this->appData || '' === $this->appData;
}
/**
* Returns whether the field is valid.
*
* @return Boolean
*/
public function isValid()
{
if (!$this->isBound()) {
throw new \LogicException('You cannot call isValid() on a form that is not bound.');
}
if ($this->hasErrors()) {
return false;
}
if (!$this->readOnly) {
foreach ($this->children as $child) {
if (!$child->isValid()) {
return false;
}
}
}
return true;
}
/**
* Returns whether or not there are errors.
*
* @return Boolean true if form is bound and not valid
*/
public function hasErrors()
{
// Don't call isValid() here, as its semantics are slightly different
// Field groups are not valid if their children are invalid, but
// hasErrors() returns only true if a field/field group itself has
// errors
return count($this->errors) > 0;
}
/**
* Returns all errors.
*
* @return array An array of FormError instances that occurred during binding
*/
public function getErrors()
{
return $this->errors;
}
/**
* Returns the DataTransformers.
*
* @return array An array of DataTransformerInterface
*/
public function getNormTransformers()
{
return $this->normTransformers;
}
/**
* Returns the DataTransformers.
*
* @return array An array of DataTransformerInterface
*/
public function getClientTransformers()
{
return $this->clientTransformers;
}
/**
* Returns all children in this group.
*
* @return array
*/
public function getChildren()
{
return $this->children;
}
/**
* Return whether the form has children.
*
* @return Boolean
*/
public function hasChildren()
{
return count($this->children) > 0;
}
/**
* Adds a child to the form.
*
* @param FormInterface $child The FormInterface to add as a child
*
* @return Form the current form
*/
public function add(FormInterface $child)
{
$this->children[$child->getName()] = $child;
$child->setParent($this);
if ($this->dataMapper) {
$this->dataMapper->mapDataToForm($this->getClientData(), $child);
}
return $this;
}
/**
* Removes a child from the form.
*
* @param string $name The name of the child to remove
*
* @return Form the current form
*/
public function remove($name)
{
if (isset($this->children[$name])) {
$this->children[$name]->setParent(null);
unset($this->children[$name]);
}
return $this;
}
/**
* Returns whether a child with the given name exists.
*
* @param string $name
*
* @return Boolean
*/
public function has($name)
{
return isset($this->children[$name]);
}
/**
* Returns the child with the given name.
*
* @param string $name
*
* @return FormInterface
*
* @throws \InvalidArgumentException if the child does not exist
*/
public function get($name)
{
if (isset($this->children[$name])) {
return $this->children[$name];
}
throw new \InvalidArgumentException(sprintf('Field "%s" does not exist.', $name));
}
/**
* Returns true if the child exists (implements the \ArrayAccess interface).
*
* @param string $name The name of the child
*
* @return Boolean true if the widget exists, false otherwise
*/
public function offsetExists($name)
{
return $this->has($name);
}
/**
* Returns the form child associated with the name (implements the \ArrayAccess interface).
*
* @param string $name The offset of the value to get
*
* @return FormInterface A form instance
*/
public function offsetGet($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 $child The child to be added
*/
public function offsetSet($name, $child)
{
$this->add($child);
}
/**
* Removes the child with the given name from the form (implements the \ArrayAccess interface).
*
* @param string $name The name of the child to be removed
*/
public function offsetUnset($name)
{
$this->remove($name);
}
/**
* Returns the iterator for this group.
*
* @return \ArrayIterator
*/
public function getIterator()
{
return new \ArrayIterator($this->children);
}
/**
* Returns the number of form children (implements the \Countable interface).
*
* @return integer The number of embedded form children
*/
public function count()
{
return count($this->children);
}
/**
* Creates a view.
*
* @param FormView $parent The parent view
*
* @return FormView The view
*/
public function createView(FormView $parent = null)
{
if (null === $parent && $this->parent) {
$parent = $this->parent->createView();
}
$view = new FormView();
$view->setParent($parent);
$types = (array) $this->types;
foreach ($types as $type) {
$type->buildView($view, $this);
foreach ($type->getExtensions() as $typeExtension) {
$typeExtension->buildView($view, $this);
}
}
$childViews = array();
foreach ($this->children as $key => $child) {
$childViews[$key] = $child->createView($view);
}
$view->setChildren($childViews);
foreach ($types as $type) {
$type->buildViewBottomUp($view, $this);
foreach ($type->getExtensions() as $typeExtension) {
$typeExtension->buildViewBottomUp($view, $this);
}
}
return $view;
}
/**
* Normalizes the value if a normalization transformer is set.
*
* @param mixed $value The value to transform
*
* @return string
*/
private function appToNorm($value)
{
foreach ($this->normTransformers as $transformer) {
$value = $transformer->transform($value);
}
return $value;
}
/**
* Reverse transforms a value if a normalization transformer is set.
*
* @param string $value The value to reverse transform
*
* @return mixed
*/
private function normToApp($value)
{
for ($i = count($this->normTransformers) - 1; $i >= 0; --$i) {
$value = $this->normTransformers[$i]->reverseTransform($value);
}
return $value;
}
/**
* Transforms the value if a value transformer is set.
*
* @param mixed $value The value to transform
*
* @return string
*/
private function normToClient($value)
{
if (!$this->clientTransformers) {
// Scalar values should always be converted to strings to
// facilitate differentiation between empty ("") and zero (0).
return null === $value || is_scalar($value) ? (string) $value : $value;
}
foreach ($this->clientTransformers as $transformer) {
$value = $transformer->transform($value);
}
return $value;
}
/**
* Reverse transforms a value if a value transformer is set.
*
* @param string $value The value to reverse transform
*
* @return mixed
*/
private function clientToNorm($value)
{
if (!$this->clientTransformers) {
return '' === $value ? null : $value;
}
for ($i = count($this->clientTransformers) - 1; $i >= 0; --$i) {
$value = $this->clientTransformers[$i]->reverseTransform($value);
}
return $value;
}
}
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