/**
* @param $field
* @param TextStyle $style
* @param Locale $locale
* @param callable $transformer
* @return array|null
*/
public static function tryFetchStyleValues($field, $style, Locale $locale, callable $transformer)
{
$bundle = new ResourceBundle($locale->getLocale(), null);
if ($style === null) {
$tmp = [];
foreach (['stand-alone', 'format'] as $id) {
foreach (['wide', 'abbreviated', 'narrow'] as $style) {
$values = $bundle['calendar']['gregorian'][$field][$id][$style];
if ($values === null) {
continue;
}
foreach ($values as $key => $value) {
$tmp[$value] = $transformer($key);
}
}
}
return $tmp;
}
$id = $style->isStandalone() ? 'stand-alone' : 'format';
$styles = [\IntlDateFormatter::FULL => 'wide', \IntlDateFormatter::MEDIUM => 'abbreviated', \IntlDateFormatter::SHORT => 'narrow'];
$values = $bundle['calendar']['gregorian'][$field][$id][$styles[$style->toCalendarStyle()]];
// fallback to stand alone if not found
if ($values === null && $id === 'format') {
$values = $bundle['calendar']['gregorian'][$field]['stand-alone'][$styles[$style->toCalendarStyle()]];
}
// ERA
if ($values === null) {
$values = $bundle['calendar']['gregorian'][$field][$styles[$style->toCalendarStyle()]];
}
// AMPM
if ($values === null) {
$values = $bundle['calendar']['gregorian'][$field];
}
if (!$values) {
return null;
}
$tmp = [];
foreach ($values as $key => $value) {
$tmp[$value] = $transformer($key);
}
return $tmp;
}
