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<?php |
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namespace Smoren\ArrayView\Structs; |
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use Smoren\ArrayView\Exceptions\IndexError; |
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use Smoren\ArrayView\Exceptions\ValueError; |
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use Smoren\ArrayView\Util; |
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/** |
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* @property-read int|null $start |
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* @property-read int|null $end |
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* @property-read int|null $step |
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*/ |
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class Slice |
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{ |
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/** |
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* @var int|null |
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*/ |
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public ?int $start; |
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/** |
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* @var int|null |
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*/ |
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public ?int $end; |
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/** |
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* @var int|null |
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*/ |
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public ?int $step; |
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/** |
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* @param string|Slice $s |
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* |
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* @return Slice |
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*/ |
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public static function toSlice($s): Slice |
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{ |
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if ($s instanceof Slice) { |
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return $s; |
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} |
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if (!self::isSliceString($s)) { |
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$str = \is_scalar($s) ? "{$s}" : gettype($s); |
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throw new ValueError("Invalid slice: \"{$str}\"."); |
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} |
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$slice = self::parseSliceString($s); |
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return new Slice(...$slice); |
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} |
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/** |
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* @param mixed $s |
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* |
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* @return bool |
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*/ |
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public static function isSlice($s): bool |
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{ |
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return ($s instanceof Slice) || static::isSliceString($s); |
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} |
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/** |
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* @param mixed $s |
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* |
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* @return bool |
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*/ |
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public static function isSliceString($s): bool |
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{ |
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if (!\is_string($s)) { |
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return false; |
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} |
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if (\is_numeric($s)) { |
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return false; |
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} |
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if (!\preg_match('/^-?[0-9]*:?-?[0-9]*:?-?[0-9]*$/', $s)) { |
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return false; |
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} |
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$slice = self::parseSliceString($s); |
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return !(\count($slice) < 1 || \count($slice) > 3); |
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} |
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/** |
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* @param mixed $s |
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* |
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* @return bool |
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*/ |
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public static function isSliceArray($s): bool |
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{ |
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if (!\is_array($s)) { |
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return false; |
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} |
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if (!(\count($s) >= 0 && \count($s) <= 3)) { |
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return false; |
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} |
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foreach ($s as $key => $item) { |
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if (\is_string($key)) { |
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return false; |
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} |
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if ($item !== null && (!\is_numeric($item) || \is_float($item + 0))) { |
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return false; |
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} |
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} |
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return true; |
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} |
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/** |
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* @param int|null $start |
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* @param int|null $end |
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* @param int|null $step |
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*/ |
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public function __construct(?int $start = null, ?int $end = null, ?int $step = null) |
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{ |
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$this->start = $start; |
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$this->end = $end; |
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$this->step = $step; |
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} |
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/** |
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* @param int $containerSize |
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* |
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* @return NormalizedSlice |
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*/ |
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public function normalize(int $containerSize): NormalizedSlice |
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{ |
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// TODO: Need refactor |
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$step = $this->step ?? 1; |
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if ($step === 0) { |
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throw new IndexError("Step cannot be 0."); |
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} |
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$defaultEnd = ($step < 0 && $this->end === null) ? -1 : null; |
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$start = $this->start ?? ($step > 0 ? 0 : $containerSize - 1); |
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$end = $this->end ?? ($step > 0 ? $containerSize : -1); |
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$start = intval(round($start)); |
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$end = intval(round($end)); |
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$step = intval(round($step)); |
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$start = Util::normalizeIndex($start, $containerSize, false); |
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$end = Util::normalizeIndex($end, $containerSize, false); |
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if ($step > 0 && $start >= $containerSize) { |
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$start = $end = $containerSize - 1; |
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} elseif ($step < 0 && $start < 0) { |
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$start = $end = 0; |
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$defaultEnd = 0; |
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} |
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$start = $this->squeezeInBounds($start, 0, $containerSize - 1); |
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$end = $this->squeezeInBounds($end, $step > 0 ? 0 : -1, $containerSize); |
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if (($step > 0 && $end < $start) || ($step < 0 && $end > $start)) { |
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$end = $start; |
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} |
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return new NormalizedSlice($start, $defaultEnd ?? $end, $step); |
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} |
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/** |
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* @return string |
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*/ |
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public function toString(): string |
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{ |
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[$start, $end, $step] = [$this->start ?? '', $this->end ?? '', $this->step ?? '']; |
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return "{$start}:{$end}:{$step}"; |
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} |
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/** |
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* @param string $s |
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* @return array<int|null> |
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*/ |
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private static function parseSliceString(string $s): array |
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{ |
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if ($s === '') { |
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return []; |
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} |
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return array_map(fn($x) => trim($x) === '' ? null : \intval(trim($x)), \explode(':', $s)); |
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} |
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/** |
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* @param int $x |
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* @param int $min |
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* @param int $max |
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* @return int |
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*/ |
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private function squeezeInBounds(int $x, int $min, int $max): int |
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{ |
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return max($min, min($max, $x)); |
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} |
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} |
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Smoren /
array-view-php
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