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<?php |
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namespace ICanBoogie\CLDR\Supplemental\Plurals; |
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use ICanBoogie\CLDR\Numbers\Number; |
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use IteratorAggregate; |
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use Traversable; |
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use function array_merge; |
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use function array_slice; |
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use function array_values; |
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use function explode; |
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use function is_array; |
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use function str_repeat; |
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use function trim; |
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/** |
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* Representation of plural samples. |
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* |
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* @internal |
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* |
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* @implements IteratorAggregate<string> |
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* |
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* @link https://unicode.org/reports/tr35/tr35-numbers.html#Samples |
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*/ |
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final class Samples implements IteratorAggregate |
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{ |
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/** |
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* @private |
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*/ |
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public const INFINITY = '…'; |
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/** |
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* @private |
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*/ |
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public const SAMPLE_RANGE_SEPARATOR = '~'; |
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public static function from(string $samples): Samples |
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{ |
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return SamplesCache::get( |
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$samples, |
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static fn(): Samples => new self(self::parse_rules($samples)) |
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); |
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} |
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/** |
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* @return array<string|string[]> |
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*/ |
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private static function parse_rules(string $sample_string): array |
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{ |
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$samples = []; |
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$type_and_samples_string_list = array_slice(explode('@', $sample_string), 1); |
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foreach ($type_and_samples_string_list as $type_and_samples_string) { |
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[ $type, $samples_string ] = explode(' ', trim($type_and_samples_string), 2); |
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$samples[$type] = self::parse_samples($samples_string); |
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} |
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return array_merge(...array_values($samples)); |
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} |
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/** |
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* Parse a samples string. |
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* |
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* |
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* @return array<string|string[]> |
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*/ |
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private static function parse_samples(string $samples_string): array |
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{ |
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$samples = []; |
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foreach (explode(', ', $samples_string) as $sample) { |
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if ($sample === self::INFINITY) { |
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continue; |
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} |
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if (!str_contains($sample, self::SAMPLE_RANGE_SEPARATOR)) { |
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$samples[] = $sample; |
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continue; |
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} |
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[ $start, $end ] = explode(self::SAMPLE_RANGE_SEPARATOR, $sample); |
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$samples[] = [ $start, $end ]; |
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} |
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return $samples; |
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} |
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/** |
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* @param float|int|numeric-string $number |
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*/ |
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private static function precision_from(float|int|string $number): int |
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{ |
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return Number::precision_from($number); |
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} |
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/** |
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* @param array<string|string[]> $samples |
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*/ |
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private function __construct( |
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private readonly array $samples |
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) { |
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} |
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/** |
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* Note: The iterator yields numeric strings to avoid '0.30000000000000004' when '0.3' is correct, |
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* and to avoid removing trailing zeros e.g. '1.0' or '1.00'. |
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*/ |
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public function getIterator(): Traversable |
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{ |
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foreach ($this->samples as $sample) { |
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if (!is_array($sample)) { |
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yield $sample; |
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continue; |
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} |
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/** |
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* @var numeric-string $start |
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* @var numeric-string $end |
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*/ |
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[ $start, $end ] = $sample; |
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$precision = self::precision_from($start) ?: self::precision_from($end); |
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$step = 1 / (int)('1' . str_repeat('0', $precision)); |
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$start += 0; |
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$end += 0; |
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// we use a for/times, so we don't lose quantities, compared to a $start += $step |
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$times = ($end - $start) / $step; |
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for ($i = 0; $i < $times + 1; $i++) { |
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yield (string)($start + $step * $i); |
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} |
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} |
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} |
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} |
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ICanBoogie /
CLDR
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