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<?php |
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namespace Vctls\IntervalGraph; |
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use Closure; |
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/** |
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* Transforms an array of overlapping intervals into another array of adjacent intervals. |
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* |
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* Each new interval holds the keys of the corresponding original intervals. |
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* |
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* @package Vctls\IntervalGraph |
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*/ |
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class Flattener |
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{ |
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/** @var Closure Substract one step from a bound value. */ |
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protected $substractStep; |
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/** @var Closure Add one step to the bound value. */ |
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protected $addStep; |
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/** |
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* Set the Closure for decrementing bound values when dealing with |
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* discontinuous sets. |
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* |
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* @param Closure $substractStep |
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* @return Flattener |
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*/ |
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public function setSubstractStep(Closure $substractStep): Flattener |
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{ |
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$this->substractStep = $substractStep; |
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return $this; |
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} |
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/** |
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* Set the Closure for incrementing bound values when dealing with |
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* discontinuous sets. |
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* |
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* @param Closure $addStep |
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* @return Flattener |
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*/ |
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public function setAddStep(Closure $addStep): Flattener |
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{ |
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$this->addStep = $addStep; |
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return $this; |
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} |
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/** |
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* Create each new interval and calculate its value based on the active intervals on each bound. |
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* |
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* @param array $bounds |
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* @return array |
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*/ |
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public function calcAdjacentIntervals(array $bounds): array |
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{ |
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$newIntervals = []; |
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$activeIntervals = []; |
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$boundsCount = count($bounds); |
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// Create new intervals for each set of two consecutive bounds, |
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// and calculate its total value. |
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for ($i = 1; $i < $boundsCount; $i++) { |
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// Set the current bound. |
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[$curBoundValue, $curBoundType, $curBoundIncluded, $curBoundIntervalKey] = $bounds[$i - 1]; |
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[$nextBoundValue, $nextBoundType, $nextBoundIncluded] = $bounds[$i]; |
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if ($curBoundType === '+') { |
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// If this is a low bound, |
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// add the key of the interval to the array of active intervals. |
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$activeIntervals[$curBoundIntervalKey] = true; |
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} else { |
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// If this is an high bound, remove the key. |
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unset($activeIntervals[$curBoundIntervalKey]); |
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} |
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if ( |
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isset($this->addStep, $this->substractStep) && ( |
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($nextBoundIncluded && $nextBoundType === '+') |
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|| (!$nextBoundIncluded && $nextBoundType === '+') |
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) |
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) { |
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$newHighBound = ($this->substractStep)($nextBoundValue); |
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} else { |
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$newHighBound = $nextBoundValue; |
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} |
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if ( |
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isset($this->addStep, $this->substractStep) && $curBoundType === '-' && $curBoundIncluded |
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) { |
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$newLowBound = ($this->addStep)($curBoundValue); |
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} else { |
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$newLowBound = $curBoundValue; |
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} |
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$newIntervals[] = [ |
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$newLowBound, |
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$newHighBound, |
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$activeIntervals |
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]; |
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} |
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return $newIntervals; |
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} |
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} |
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vctls /
php-interval-graph
