protected function getTree(DateTimeParseContext $context)
{
// prepare parse tree
$regionIds = ZoneRulesProvider::getAvailableZoneIds();
$regionIdsSize = count($regionIds);
$cached = $context->isCaseSensitive() ? self::$cachedPrefixTree : self::$cachedPrefixTreeCI;
if ($cached == null || $cached->getKey() != $regionIdsSize) {
$cached = $context->isCaseSensitive() ? self::$cachedPrefixTree : self::$cachedPrefixTreeCI;
if ($cached == null || $cached->getKey() != $regionIdsSize) {
$cached = new SimpleImmutableEntry($regionIdsSize, PrefixTree::newTree($regionIds, $context));
if ($context->isCaseSensitive()) {
self::$cachedPrefixTree = $cached;
} else {
self::$cachedPrefixTreeCI = $cached;
}
}
}
return $cached->getValue();
}
public function parse(DateTimeParseContext $context, $text, $position)
{
$length = strlen($text);
if ($position === $length) {
return ~$position;
}
if ($position < 0 || $position >= $length) {
throw new \OutOfRangeException();
}
$ch = $text[$position];
if ($ch !== $this->literal) {
if ($context->isCaseSensitive() || strtoupper($ch) !== strtoupper($this->literal) && strtolower($ch) !== strtolower($this->literal)) {
return ~$position;
}
}
return $position + 1;
}
