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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\Extension\Core\ChoiceList;
use Symfony\Component\Form\FormConfigBuilder;
use Symfony\Component\Form\Exception\UnexpectedTypeException;
use Symfony\Component\Form\Exception\InvalidConfigurationException;
use Symfony\Component\Form\Exception\InvalidArgumentException;
use Symfony\Component\Form\Extension\Core\View\ChoiceView;
/**
* A choice list for choices of arbitrary data types.
*
* Choices and labels are passed in two arrays. The indices of the choices
* and the labels should match. Choices may also be given as hierarchy of
* unlimited depth by creating nested arrays. The title of the sub-hierarchy
* can be stored in the array key pointing to the nested array. The topmost
* level of the hierarchy may also be a \Traversable.
*
* <code>
* $choices = array(true, false);
* $labels = array('Agree', 'Disagree');
* $choiceList = new ChoiceList($choices, $labels);
* </code>
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class ChoiceList implements ChoiceListInterface
{
/**
* The choices with their indices as keys.
*
* @var array
*/
private $choices = array();
/**
* The choice values with the indices of the matching choices as keys.
*
* @var array
*/
private $values = array();
/**
* The preferred view objects as hierarchy containing also the choice groups
* with the indices of the matching choices as bottom-level keys.
*
* @var array
*/
private $preferredViews = array();
/**
* The non-preferred view objects as hierarchy containing also the choice
* groups with the indices of the matching choices as bottom-level keys.
*
* @var array
*/
private $remainingViews = array();
/**
* Creates a new choice list.
*
* @param array|\Traversable $choices The array of choices. Choices may also be given
* as hierarchy of unlimited depth. Hierarchies are
* created by creating nested arrays. The title of
* the sub-hierarchy can be stored in the array
* key pointing to the nested array. The topmost
* level of the hierarchy may also be a \Traversable.
* @param array $labels The array of labels. The structure of this array
* should match the structure of $choices.
* @param array $preferredChoices A flat array of choices that should be
* presented to the user with priority.
*
* @throws UnexpectedTypeException If the choices are not an array or \Traversable.
*/
public function __construct($choices, array $labels, array $preferredChoices = array())
{
if (!is_array($choices) && !$choices instanceof \Traversable) {
throw new UnexpectedTypeException($choices, 'array or \Traversable');
}
$this->initialize($choices, $labels, $preferredChoices);
}
/**
* Initializes the list with choices.
*
* Safe to be called multiple times. The list is cleared on every call.
*
* @param array|\Traversable $choices The choices to write into the list.
* @param array $labels The labels belonging to the choices.
* @param array $preferredChoices The choices to display with priority.
*/
protected function initialize($choices, array $labels, array $preferredChoices)
{
$this->choices = array();
$this->values = array();
$this->preferredViews = array();
$this->remainingViews = array();
$this->addChoices(
$this->preferredViews,
$this->remainingViews,
$choices,
$labels,
$preferredChoices
);
}
/**
* {@inheritdoc}
*/
public function getChoices()
{
return $this->choices;
}
/**
* {@inheritdoc}
*/
public function getValues()
{
return $this->values;
}
/**
* {@inheritdoc}
*/
public function getPreferredViews()
{
return $this->preferredViews;
}
/**
* {@inheritdoc}
*/
public function getRemainingViews()
{
return $this->remainingViews;
}
/**
* {@inheritdoc}
*/
public function getChoicesForValues(array $values)
{
$values = $this->fixValues($values);
$choices = array();
foreach ($values as $i => $givenValue) {
foreach ($this->values as $j => $value) {
if ($value === $givenValue) {
$choices[$i] = $this->choices[$j];
unset($values[$i]);
if (0 === count($values)) {
break 2;
}
}
}
}
return $choices;
}
/**
* {@inheritdoc}
*/
public function getValuesForChoices(array $choices)
{
$choices = $this->fixChoices($choices);
$values = array();
foreach ($choices as $i => $givenChoice) {
foreach ($this->choices as $j => $choice) {
if ($choice === $givenChoice) {
$values[$i] = $this->values[$j];
unset($choices[$i]);
if (0 === count($choices)) {
break 2;
}
}
}
}
return $values;
}
/**
* {@inheritdoc}
*
* @deprecated Deprecated since version 2.4, to be removed in 3.0.
*/
public function getIndicesForChoices(array $choices)
{
$choices = $this->fixChoices($choices);
$indices = array();
foreach ($choices as $i => $givenChoice) {
foreach ($this->choices as $j => $choice) {
if ($choice === $givenChoice) {
$indices[$i] = $j;
unset($choices[$i]);
if (0 === count($choices)) {
break 2;
}
}
}
}
return $indices;
}
/**
* {@inheritdoc}
*
* @deprecated Deprecated since version 2.4, to be removed in 3.0.
*/
public function getIndicesForValues(array $values)
{
$values = $this->fixValues($values);
$indices = array();
foreach ($values as $i => $givenValue) {
foreach ($this->values as $j => $value) {
if ($value === $givenValue) {
$indices[$i] = $j;
unset($values[$i]);
if (0 === count($values)) {
break 2;
}
}
}
}
return $indices;
}
/**
* Recursively adds the given choices to the list.
*
* @param array $bucketForPreferred The bucket where to store the preferred
* view objects.
* @param array $bucketForRemaining The bucket where to store the
* non-preferred view objects.
* @param array|\Traversable $choices The list of choices.
* @param array $labels The labels corresponding to the choices.
* @param array $preferredChoices The preferred choices.
*
* @throws InvalidArgumentException If the structures of the choices and labels array do not match.
* @throws InvalidConfigurationException If no valid value or index could be created for a choice.
*/
protected function addChoices(array &$bucketForPreferred, array &$bucketForRemaining, $choices, array $labels, array $preferredChoices)
{
// Add choices to the nested buckets
foreach ($choices as $group => $choice) {
if (!array_key_exists($group, $labels)) {
throw new InvalidArgumentException('The structures of the choices and labels array do not match.');
}
if (is_array($choice)) {
// Don't do the work if the array is empty
if (count($choice) > 0) {
$this->addChoiceGroup(
$group,
$bucketForPreferred,
$bucketForRemaining,
$choice,
$labels[$group],
$preferredChoices
);
}
} else {
$this->addChoice(
$bucketForPreferred,
$bucketForRemaining,
$choice,
$labels[$group],
$preferredChoices
);
}
}
}
/**
* Recursively adds a choice group.
*
* @param string $group The name of the group.
* @param array $bucketForPreferred The bucket where to store the preferred
* view objects.
* @param array $bucketForRemaining The bucket where to store the
* non-preferred view objects.
* @param array $choices The list of choices in the group.
* @param array $labels The labels corresponding to the choices in the group.
* @param array $preferredChoices The preferred choices.
*
* @throws InvalidConfigurationException If no valid value or index could be created for a choice.
*/
protected function addChoiceGroup($group, array &$bucketForPreferred, array &$bucketForRemaining, array $choices, array $labels, array $preferredChoices)
{
// If this is a choice group, create a new level in the choice
// key hierarchy
$bucketForPreferred[$group] = array();
$bucketForRemaining[$group] = array();
$this->addChoices(
$bucketForPreferred[$group],
$bucketForRemaining[$group],
$choices,
$labels,
$preferredChoices
);
// Remove child levels if empty
if (empty($bucketForPreferred[$group])) {
unset($bucketForPreferred[$group]);
}
if (empty($bucketForRemaining[$group])) {
unset($bucketForRemaining[$group]);
}
}
/**
* Adds a new choice.
*
* @param array $bucketForPreferred The bucket where to store the preferred
* view objects.
* @param array $bucketForRemaining The bucket where to store the
* non-preferred view objects.
* @param mixed $choice The choice to add.
* @param string $label The label for the choice.
* @param array $preferredChoices The preferred choices.
*
* @throws InvalidConfigurationException If no valid value or index could be created.
*/
protected function addChoice(array &$bucketForPreferred, array &$bucketForRemaining, $choice, $label, array $preferredChoices)
{
$index = $this->createIndex($choice);
if ('' === $index || null === $index || !FormConfigBuilder::isValidName((string) $index)) {
throw new InvalidConfigurationException(sprintf('The index "%s" created by the choice list is invalid. It should be a valid, non-empty Form name.', $index));
}
$value = $this->createValue($choice);
if (!is_string($value)) {
throw new InvalidConfigurationException(sprintf('The value created by the choice list is of type "%s", but should be a string.', gettype($value)));
}
$view = new ChoiceView($choice, $value, $label);
$this->choices[$index] = $this->fixChoice($choice);
$this->values[$index] = $value;
if ($this->isPreferred($choice, $preferredChoices)) {
$bucketForPreferred[$index] = $view;
} else {
$bucketForRemaining[$index] = $view;
}
}
/**
* Returns whether the given choice should be preferred judging by the
* given array of preferred choices.
*
* Extension point to optimize performance by changing the structure of the
* $preferredChoices array.
*
* @param mixed $choice The choice to test.
* @param array $preferredChoices An array of preferred choices.
*
* @return Boolean Whether the choice is preferred.
*/
protected function isPreferred($choice, array $preferredChoices)
{
return false !== array_search($choice, $preferredChoices, true);
}
/**
* Creates a new unique index for this choice.
*
* Extension point to change the indexing strategy.
*
* @param mixed $choice The choice to create an index for
*
* @return integer|string A unique index containing only ASCII letters,
* digits and underscores.
*/
protected function createIndex($choice)
{
return count($this->choices);
}
/**
* Creates a new unique value for this choice.
*
* By default, an integer is generated since it cannot be guaranteed that
* all values in the list are convertible to (unique) strings. Subclasses
* can override this behaviour if they can guarantee this property.
*
* @param mixed $choice The choice to create a value for
*
* @return string A unique string.
*/
protected function createValue($choice)
{
return (string) count($this->values);
}
/**
* Fixes the data type of the given choice value to avoid comparison
* problems.
*
* @param mixed $value The choice value.
*
* @return string The value as string.
*/
protected function fixValue($value)
{
return (string) $value;
}
/**
* Fixes the data types of the given choice values to avoid comparison
* problems.
*
* @param array $values The choice values.
*
* @return array The values as strings.
*/
protected function fixValues(array $values)
{
foreach ($values as $i => $value) {
$values[$i] = $this->fixValue($value);
}
return $values;
}
/**
* Fixes the data type of the given choice index to avoid comparison
* problems.
*
* @param mixed $index The choice index.
*
* @return integer|string The index as PHP array key.
*/
protected function fixIndex($index)
{
if (is_bool($index) || (string) (int) $index === (string) $index) {
return (int) $index;
}
return (string) $index;
}
/**
* Fixes the data types of the given choice indices to avoid comparison
* problems.
*
* @param array $indices The choice indices.
*
* @return array The indices as strings.
*/
protected function fixIndices(array $indices)
{
foreach ($indices as $i => $index) {
$indices[$i] = $this->fixIndex($index);
}
return $indices;
}
/**
* Fixes the data type of the given choice to avoid comparison problems.
*
* Extension point. In this implementation, choices are guaranteed to
* always maintain their type and thus can be typesafely compared.
*
* @param mixed $choice The choice
*
* @return mixed The fixed choice
*/
protected function fixChoice($choice)
{
return $choice;
}
/**
* Fixes the data type of the given choices to avoid comparison problems.
*
* @param array $choices The choices.
*
* @return array The fixed choices.
*
* @see fixChoice
*/
protected function fixChoices(array $choices)
{
return $choices;
}
}