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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\ChoiceList\Factory;
use Symfony\Component\Form\ChoiceList\ArrayChoiceList;
use Symfony\Component\Form\ChoiceList\ChoiceListInterface;
use Symfony\Component\Form\ChoiceList\LazyChoiceList;
use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
use Symfony\Component\Form\ChoiceList\View\ChoiceGroupView;
use Symfony\Component\Form\ChoiceList\View\ChoiceListView;
use Symfony\Component\Form\ChoiceList\View\ChoiceView;
/**
* Default implementation of {@link ChoiceListFactoryInterface}.
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class DefaultChoiceListFactory implements ChoiceListFactoryInterface
{
/**
* {@inheritdoc}
*/
public function createListFromChoices($choices, $value = null)
{
return new ArrayChoiceList($choices, $value);
}
/**
* {@inheritdoc}
*/
public function createListFromLoader(ChoiceLoaderInterface $loader, $value = null)
{
return new LazyChoiceList($loader, $value);
}
/**
* {@inheritdoc}
*/
public function createView(ChoiceListInterface $list, $preferredChoices = null, $label = null, $index = null, $groupBy = null, $attr = null)
{
$preferredViews = [];
$otherViews = [];
$choices = $list->getChoices();
$keys = $list->getOriginalKeys();
if (!\is_callable($preferredChoices) && !empty($preferredChoices)) {
$preferredChoices = function ($choice) use ($preferredChoices) {
return \in_array($choice, $preferredChoices, true);
};
}
// The names are generated from an incrementing integer by default
if (null === $index) {
$index = 0;
}
// If $groupBy is a callable, choices are added to the group with the
// name returned by the callable. If the callable returns null, the
// choice is not added to any group
if (\is_callable($groupBy)) {
foreach ($choices as $value => $choice) {
self::addChoiceViewGroupedBy(
$groupBy,
$choice,
(string) $value,
$label,
$keys,
$index,
$attr,
$preferredChoices,
$preferredViews,
$otherViews
);
}
} else {
// Otherwise use the original structure of the choices
self::addChoiceViewsGroupedBy(
$list->getStructuredValues(),
$label,
$choices,
$keys,
$index,
$attr,
$preferredChoices,
$preferredViews,
$otherViews
);
}
// Remove any empty group view that may have been created by
// addChoiceViewGroupedBy()
foreach ($preferredViews as $key => $view) {
if ($view instanceof ChoiceGroupView && 0 === \count($view->choices)) {
unset($preferredViews[$key]);
}
}
foreach ($otherViews as $key => $view) {
if ($view instanceof ChoiceGroupView && 0 === \count($view->choices)) {
unset($otherViews[$key]);
}
}
return new ChoiceListView($otherViews, $preferredViews);
}
private static function addChoiceView($choice, $value, $label, $keys, &$index, $attr, $isPreferred, &$preferredViews, &$otherViews)
{
// $value may be an integer or a string, since it's stored in the array
// keys. We want to guarantee it's a string though.
$key = $keys[$value];
$nextIndex = \is_int($index) ? $index++ : \call_user_func($index, $choice, $key, $value);
// BC normalize label to accept a false value
if (null === $label) {
// If the labels are null, use the original choice key by default
$label = (string) $key;
} elseif (false !== $label) {
// If "choice_label" is set to false and "expanded" is true, the value false
// should be passed on to the "label" option of the checkboxes/radio buttons
$dynamicLabel = \call_user_func($label, $choice, $key, $value);
$label = false === $dynamicLabel ? false : (string) $dynamicLabel;
}
$view = new ChoiceView(
$choice,
$value,
$label,
// The attributes may be a callable or a mapping from choice indices
// to nested arrays
\is_callable($attr) ? \call_user_func($attr, $choice, $key, $value) : (isset($attr[$key]) ? $attr[$key] : [])
);
// $isPreferred may be null if no choices are preferred
if ($isPreferred && \call_user_func($isPreferred, $choice, $key, $value)) {
$preferredViews[$nextIndex] = $view;
} else {
$otherViews[$nextIndex] = $view;
}
}
private static function addChoiceViewsGroupedBy($groupBy, $label, $choices, $keys, &$index, $attr, $isPreferred, &$preferredViews, &$otherViews)
{
foreach ($groupBy as $key => $value) {
if (null === $value) {
continue;
}
// Add the contents of groups to new ChoiceGroupView instances
if (\is_array($value)) {
$preferredViewsForGroup = [];
$otherViewsForGroup = [];
self::addChoiceViewsGroupedBy(
$value,
$label,
$choices,
$keys,
$index,
$attr,
$isPreferred,
$preferredViewsForGroup,
$otherViewsForGroup
);
if (\count($preferredViewsForGroup) > 0) {
$preferredViews[$key] = new ChoiceGroupView($key, $preferredViewsForGroup);
}
if (\count($otherViewsForGroup) > 0) {
$otherViews[$key] = new ChoiceGroupView($key, $otherViewsForGroup);
}
continue;
}
// Add ungrouped items directly
self::addChoiceView(
$choices[$value],
$value,
$label,
$keys,
$index,
$attr,
$isPreferred,
$preferredViews,
$otherViews
);
}
}
private static function addChoiceViewGroupedBy($groupBy, $choice, $value, $label, $keys, &$index, $attr, $isPreferred, &$preferredViews, &$otherViews)
{
$groupLabel = \call_user_func($groupBy, $choice, $keys[$value], $value);
if (null === $groupLabel) {
// If the callable returns null, don't group the choice
self::addChoiceView(
$choice,
$value,
$label,
$keys,
$index,
$attr,
$isPreferred,
$preferredViews,
$otherViews
);
return;
}
$groupLabel = (string) $groupLabel;
// Initialize the group views if necessary. Unnecessarily built group
// views will be cleaned up at the end of createView()
if (!isset($preferredViews[$groupLabel])) {
$preferredViews[$groupLabel] = new ChoiceGroupView($groupLabel);
$otherViews[$groupLabel] = new ChoiceGroupView($groupLabel);
}
self::addChoiceView(
$choice,
$value,
$label,
$keys,
$index,
$attr,
$isPreferred,
$preferredViews[$groupLabel]->choices,
$otherViews[$groupLabel]->choices
);
}
}