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<?php |
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/* this file is part of pipelines */ |
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namespace Ktomk\Pipelines\Value; |
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use Ktomk\Pipelines\Lib; |
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/** |
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* Class StepExpression |
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* |
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* @package Ktomk\Pipelines\Value |
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*/ |
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class StepExpression |
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{ |
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/** |
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* @var array 1-3, -5, 1- |
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*/ |
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private $segments; |
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/** |
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* @param string $expression |
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* |
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* @return StepExpression |
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*/ |
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public static function createFromString($expression) |
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{ |
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return new self(self::parseSegments($expression)); |
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} |
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/** |
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* Is a step expression syntactically valid? |
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* |
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* @param string $expression |
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* |
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* @return bool |
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*/ |
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public static function validate($expression) |
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{ |
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try { |
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self::parseSegments($expression); |
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} catch (\InvalidArgumentException $ex) { |
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return false; |
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} |
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return true; |
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} |
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public static function resolveSegmentCount($segment, $count) |
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{ |
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$pos = strpos($segment, '-'); |
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list($from, $to) = explode('-', $segment, 2) + array('', ''); |
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if (false === $pos) { |
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return array(self::verifyValueCount((int)Lib::emptyCoalesce($from, $to), $count)); |
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} |
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if (empty($to)) { |
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return range(self::verifyValueCount($from, $count), $count); |
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} |
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if (empty($from)) { |
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return range(self::verifyValueCount(1, $count), self::verifyValueCount($to, $count)); |
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} |
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return range(self::verifyValueCount($from, $count), self::verifyValueCount($to, $count)); |
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} |
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/** |
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* StepExpression constructor. |
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* |
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* @param array $segments |
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*/ |
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public function __construct(array $segments) |
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{ |
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$this->segments = $segments; |
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} |
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/** |
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* @return array |
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*/ |
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public function getSegments() |
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{ |
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return $this->segments; |
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} |
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/** |
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* @param mixed $countable |
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* |
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* @return mixed |
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*/ |
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public function resolveCountable($countable) |
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{ |
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return $this->resolveCount(count($countable)); |
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} |
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/** |
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* @param int $count |
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*/ |
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public function resolveCount($count) |
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{ |
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if (0 === $count || !is_int($count)) { |
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throw new \InvalidArgumentException('Count is zero'); |
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} |
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$range = Lib::merge(array_map(self::resolveSegmentFunctor($count), $this->segments)); |
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return call_user_func_array('array_merge', $range); |
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} |
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/** |
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* @param $buffer |
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* |
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* @return array|string[] |
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*/ |
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private static function parseSegments($buffer) |
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{ |
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$normalized = preg_replace(array('~\s+~', '~(\d+)\s+(-)~', '~(-)\s+(\d+)+~'), array(' ', '\\1\\2', '\\1\\2'), $buffer); |
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if (empty($normalized)) { |
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throw new \InvalidArgumentException(sprintf('No steps: "%s"', $buffer)); |
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} |
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$result = preg_split('~\s*(?:,|\s)\s*~', $normalized, 64, PREG_SPLIT_NO_EMPTY); |
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if (empty($result)) { |
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throw new \InvalidArgumentException(sprintf('No steps: "%s"', $buffer)); |
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} |
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$array = array(); |
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foreach ($result as $segmentBuffer) { |
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$array[] = self::parseSegment($segmentBuffer); |
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} |
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return $array; |
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} |
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/** |
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* Parse (better: normalize) segment |
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* |
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* @param string $buffer |
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* |
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* @return string |
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*/ |
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private static function parseSegment($buffer) |
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{ |
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$segment = preg_replace('~\s+~', '', $buffer); |
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if (null === $segment) { |
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// @codeCoverageIgnoreStart |
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throw new \InvalidArgumentException(sprintf('Can not parse step segment for "%s"', $buffer)); |
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// @codeCoverageIgnoreEnd |
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} |
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$result = preg_match('~^(?:(?:[1-9]\d*)?-(?:[1-9]\d*)?|(?:[1-9]\d*))$~', $segment); |
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if (false === $result || 0 === $result || '-' === $segment) { |
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if ($buffer !== $segment) { |
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// @codeCoverageIgnoreStart |
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throw new \InvalidArgumentException(sprintf('Can not parse step segment for "%s" (from "%s")', $segment, $buffer)); |
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// @codeCoverageIgnoreEnd |
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} |
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throw new \InvalidArgumentException(sprintf('Can not parse step segment for "%s"', $segment)); |
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} |
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return $segment; |
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} |
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/** |
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* @param int $count |
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*/ |
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private static function resolveSegmentFunctor($count) |
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{ |
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return function ($segment) use ($count) { |
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return StepExpression::resolveSegmentCount($segment, $count); |
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}; |
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} |
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/** |
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* @param int $value |
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* @param int $count |
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* |
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* @return int |
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*/ |
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12 |
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private static function verifyValueCount($value, $count) |
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{ |
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if ($value > $count) { |
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throw new \InvalidArgumentException(sprintf('%d is out of range (%d)', $value, $count)); |
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} |
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return $value; |
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} |
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} |
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ktomk /
pipelines
