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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Form\ChoiceList;
/**
* A list of choices with arbitrary data types.
*
* The user of this class is responsible for assigning string values to the
* choices and for their uniqueness.
* Both the choices and their values are passed to the constructor.
* Each choice must have a corresponding value (with the same key) in
* the values array.
*
* @author Bernhard Schussek <[email protected]>
*/
class ArrayChoiceList implements ChoiceListInterface
{
/**
* The choices in the list.
*
* @var array
*/
protected $choices;
/**
* The values indexed by the original keys.
*
* @var array
*/
protected $structuredValues;
/**
* The original keys of the choices array.
*
* @var int[]|string[]
*/
protected $originalKeys;
protected $valueCallback;
/**
* Creates a list with the given choices and values.
*
* The given choice array must have the same array keys as the value array.
*
* @param iterable $choices The selectable choices
* @param callable|null $value The callable for creating the value
* for a choice. If `null` is passed,
* incrementing integers are used as
* values
*/
public function __construct(iterable $choices, ?callable $value = null)
{
if ($choices instanceof \Traversable) {
$choices = iterator_to_array($choices);
}
if (null === $value && $this->castableToString($choices)) {
$value = function ($choice) {
return false === $choice ? '0' : (string) $choice;
};
}
if (null !== $value) {
// If a deterministic value generator was passed, use it later
$this->valueCallback = $value;
} else {
// Otherwise generate incrementing integers as values
$i = 0;
$value = function () use (&$i) {
return $i++;
};
}
// If the choices are given as recursive array (i.e. with explicit
// choice groups), flatten the array. The grouping information is needed
// in the view only.
$this->flatten($choices, $value, $choicesByValues, $keysByValues, $structuredValues);
$this->choices = $choicesByValues;
$this->originalKeys = $keysByValues;
$this->structuredValues = $structuredValues;
}
/**
* {@inheritdoc}
*/
public function getChoices()
{
return $this->choices;
}
/**
* {@inheritdoc}
*/
public function getValues()
{
return array_map('strval', array_keys($this->choices));
}
/**
* {@inheritdoc}
*/
public function getStructuredValues()
{
return $this->structuredValues;
}
/**
* {@inheritdoc}
*/
public function getOriginalKeys()
{
return $this->originalKeys;
}
/**
* {@inheritdoc}
*/
public function getChoicesForValues(array $values)
{
$choices = [];
foreach ($values as $i => $givenValue) {
if (\array_key_exists($givenValue, $this->choices)) {
$choices[$i] = $this->choices[$givenValue];
}
}
return $choices;
}
/**
* {@inheritdoc}
*/
public function getValuesForChoices(array $choices)
{
$values = [];
// Use the value callback to compare choices by their values, if present
if ($this->valueCallback) {
$givenValues = [];
foreach ($choices as $i => $givenChoice) {
$givenValues[$i] = (string) ($this->valueCallback)($givenChoice);
}
return array_intersect($givenValues, array_keys($this->choices));
}
// Otherwise compare choices by identity
foreach ($choices as $i => $givenChoice) {
foreach ($this->choices as $value => $choice) {
if ($choice === $givenChoice) {
$values[$i] = (string) $value;
break;
}
}
}
return $values;
}
/**
* Flattens an array into the given output variables.
*
* @param array $choices The array to flatten
* @param callable $value The callable for generating choice values
* @param array|null $choicesByValues The flattened choices indexed by the
* corresponding values
* @param array|null $keysByValues The original keys indexed by the
* corresponding values
* @param array|null $structuredValues The values indexed by the original keys
*
* @internal
*/
protected function flatten(array $choices, callable $value, ?array &$choicesByValues, ?array &$keysByValues, ?array &$structuredValues)
{
if (null === $choicesByValues) {
$choicesByValues = [];
$keysByValues = [];
$structuredValues = [];
}
foreach ($choices as $key => $choice) {
if (\is_array($choice)) {
$this->flatten($choice, $value, $choicesByValues, $keysByValues, $structuredValues[$key]);
continue;
}
$choiceValue = (string) $value($choice);
$choicesByValues[$choiceValue] = $choice;
$keysByValues[$choiceValue] = $key;
$structuredValues[$key] = $choiceValue;
}
}
/**
* Checks whether the given choices can be cast to strings without
* generating duplicates.
* This method is responsible for preventing conflict between scalar values
* and the empty value.
*/
private function castableToString(array $choices, array &$cache = []): bool
{
foreach ($choices as $choice) {
if (\is_array($choice)) {
if (!$this->castableToString($choice, $cache)) {
return false;
}
continue;
} elseif (!\is_scalar($choice)) {
return false;
}
// prevent having false casted to the empty string by isset()
$choice = false === $choice ? '0' : (string) $choice;
if (isset($cache[$choice])) {
return false;
}
$cache[$choice] = true;
}
return true;
}
}