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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 that can be selected in a choice field.
*
* A choice list assigns unique string values to each of a list of choices.
* These string values are displayed in the "value" attributes in HTML and
* submitted back to the server.
*
* The acceptable data types for the choices depend on the implementation.
* Values must always be strings and (within the list) free of duplicates.
*
* @author Bernhard Schussek <[email protected]>
*/
interface ChoiceListInterface
{
/**
* Returns all selectable choices.
*
* @return array The selectable choices indexed by the corresponding values
*/
public function getChoices();
/**
* Returns the values for the choices.
*
* The values are strings that do not contain duplicates:
*
* $form->add('field', 'choice', [
* 'choices' => [
* 'Decided' => ['Yes' => true, 'No' => false],
* 'Undecided' => ['Maybe' => null],
* ],
* ]);
*
* In this example, the result of this method is:
*
* [
* 'Yes' => '0',
* 'No' => '1',
* 'Maybe' => '2',
* ]
*
* Null and false MUST NOT conflict when being casted to string.
* For this some default incremented values SHOULD be computed.
*
* @return string[]
*/
public function getValues();
/**
* Returns the values in the structure originally passed to the list.
*
* Contrary to {@link getValues()}, the result is indexed by the original
* keys of the choices. If the original array contained nested arrays, these
* nested arrays are represented here as well:
*
* $form->add('field', 'choice', [
* 'choices' => [
* 'Decided' => ['Yes' => true, 'No' => false],
* 'Undecided' => ['Maybe' => null],
* ],
* ]);
*
* In this example, the result of this method is:
*
* [
* 'Decided' => ['Yes' => '0', 'No' => '1'],
* 'Undecided' => ['Maybe' => '2'],
* ]
*
* Nested arrays do not make sense in a view format unless
* they are used as a convenient way of grouping.
* If the implementation does not intend to support grouped choices,
* this method SHOULD be equivalent to {@link getValues()}.
* The $groupBy callback parameter SHOULD be used instead.
*
* @return string[]
*/
public function getStructuredValues();
/**
* Returns the original keys of the choices.
*
* The original keys are the keys of the choice array that was passed in the
* "choice" option of the choice type. Note that this array may contain
* duplicates if the "choice" option contained choice groups:
*
* $form->add('field', 'choice', [
* 'choices' => [
* 'Decided' => [true, false],
* 'Undecided' => [null],
* ],
* ]);
*
* In this example, the original key 0 appears twice, once for `true` and
* once for `null`.
*
* @return int[]|string[] The original choice keys indexed by the
* corresponding choice values
*/
public function getOriginalKeys();
/**
* Returns the choices corresponding to the given values.
*
* The choices are returned with the same keys and in the same order as the
* corresponding values in the given array.
*
* @param string[] $values An array of choice values. Non-existing values in
* this array are ignored
*
* @return array
*/
public function getChoicesForValues(array $values);
/**
* Returns the values corresponding to the given choices.
*
* The values are returned with the same keys and in the same order as the
* corresponding choices in the given array.
*
* @param array $choices An array of choices. Non-existing choices in this
* array are ignored
*
* @return string[]
*/
public function getValuesForChoices(array $choices);
}