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238
vendor/symfony/form/ChoiceList/ArrayChoiceList.php
vendored
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238
vendor/symfony/form/ChoiceList/ArrayChoiceList.php
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Form\ChoiceList;
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/**
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* A list of choices with arbitrary data types.
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*
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* The user of this class is responsible for assigning string values to the
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* choices annd for their uniqueness.
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* Both the choices and their values are passed to the constructor.
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* Each choice must have a corresponding value (with the same key) in
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* the values array.
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*
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* @author Bernhard Schussek <bschussek@gmail.com>
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*/
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class ArrayChoiceList implements ChoiceListInterface
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{
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/**
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* The choices in the list.
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*
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* @var array
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*/
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protected $choices;
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/**
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* The values indexed by the original keys.
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*
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* @var array
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*/
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protected $structuredValues;
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/**
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* The original keys of the choices array.
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*
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* @var int[]|string[]
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*/
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protected $originalKeys;
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protected $valueCallback;
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/**
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* Creates a list with the given choices and values.
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*
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* The given choice array must have the same array keys as the value array.
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*
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* @param iterable $choices The selectable choices
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* @param callable|null $value The callable for creating the value
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* for a choice. If `null` is passed,
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* incrementing integers are used as
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* values
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*/
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public function __construct(iterable $choices, callable $value = null)
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{
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if ($choices instanceof \Traversable) {
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$choices = iterator_to_array($choices);
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}
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if (null === $value && $this->castableToString($choices)) {
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$value = function ($choice) {
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return false === $choice ? '0' : (string) $choice;
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};
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}
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if (null !== $value) {
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// If a deterministic value generator was passed, use it later
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$this->valueCallback = $value;
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} else {
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// Otherwise generate incrementing integers as values
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$i = 0;
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$value = function () use (&$i) {
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return $i++;
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};
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}
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// If the choices are given as recursive array (i.e. with explicit
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// choice groups), flatten the array. The grouping information is needed
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// in the view only.
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$this->flatten($choices, $value, $choicesByValues, $keysByValues, $structuredValues);
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$this->choices = $choicesByValues;
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$this->originalKeys = $keysByValues;
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$this->structuredValues = $structuredValues;
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}
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/**
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* {@inheritdoc}
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*/
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public function getChoices()
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{
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return $this->choices;
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}
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/**
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* {@inheritdoc}
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*/
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public function getValues()
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{
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return array_map('strval', array_keys($this->choices));
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}
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/**
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* {@inheritdoc}
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*/
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public function getStructuredValues()
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{
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return $this->structuredValues;
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}
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/**
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* {@inheritdoc}
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*/
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public function getOriginalKeys()
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{
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return $this->originalKeys;
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}
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/**
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* {@inheritdoc}
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*/
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public function getChoicesForValues(array $values)
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{
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$choices = [];
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foreach ($values as $i => $givenValue) {
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if (\array_key_exists($givenValue, $this->choices)) {
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$choices[$i] = $this->choices[$givenValue];
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}
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}
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return $choices;
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}
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/**
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* {@inheritdoc}
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*/
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public function getValuesForChoices(array $choices)
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{
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$values = [];
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// Use the value callback to compare choices by their values, if present
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if ($this->valueCallback) {
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$givenValues = [];
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foreach ($choices as $i => $givenChoice) {
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$givenValues[$i] = (string) ($this->valueCallback)($givenChoice);
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}
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return array_intersect($givenValues, array_keys($this->choices));
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}
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// Otherwise compare choices by identity
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foreach ($choices as $i => $givenChoice) {
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foreach ($this->choices as $value => $choice) {
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if ($choice === $givenChoice) {
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$values[$i] = (string) $value;
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break;
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}
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}
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}
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return $values;
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}
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/**
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* Flattens an array into the given output variables.
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*
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* @param array $choices The array to flatten
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* @param callable $value The callable for generating choice values
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* @param array|null $choicesByValues The flattened choices indexed by the
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* corresponding values
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* @param array|null $keysByValues The original keys indexed by the
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* corresponding values
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* @param array|null $structuredValues The values indexed by the original keys
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*
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* @internal
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*/
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protected function flatten(array $choices, callable $value, ?array &$choicesByValues, ?array &$keysByValues, ?array &$structuredValues)
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{
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if (null === $choicesByValues) {
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$choicesByValues = [];
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$keysByValues = [];
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$structuredValues = [];
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}
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foreach ($choices as $key => $choice) {
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if (\is_array($choice)) {
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$this->flatten($choice, $value, $choicesByValues, $keysByValues, $structuredValues[$key]);
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continue;
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}
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$choiceValue = (string) $value($choice);
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$choicesByValues[$choiceValue] = $choice;
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$keysByValues[$choiceValue] = $key;
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$structuredValues[$key] = $choiceValue;
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}
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}
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/**
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* Checks whether the given choices can be cast to strings without
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* generating duplicates.
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* This method is responsible for preventing conflict between scalar values
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* and the empty value.
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*/
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private function castableToString(array $choices, array &$cache = []): bool
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{
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foreach ($choices as $choice) {
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if (\is_array($choice)) {
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if (!$this->castableToString($choice, $cache)) {
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return false;
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}
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continue;
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} elseif (!is_scalar($choice)) {
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return false;
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}
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// prevent having false casted to the empty string by isset()
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$choice = false === $choice ? '0' : (string) $choice;
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if (isset($cache[$choice])) {
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return false;
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}
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$cache[$choice] = true;
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}
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return true;
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}
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}
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