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<?php |
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namespace UCD\Unicode\Codepoint; |
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use UCD\Unicode\Codepoint; |
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use UCD\Unicode\Codepoint\Range; |
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use UCD\Exception\UnexpectedValueException; |
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class Aggregator |
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{ |
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/** |
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* @var Range[] |
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*/ |
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private $aggregated = []; |
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/** |
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* @var Codepoint|null |
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*/ |
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private $previous; |
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/** |
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* @var Codepoint|null |
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*/ |
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private $rangeStart; |
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/** |
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* @param Codepoint $codepoint |
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*/ |
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public function addCodepoint(Codepoint $codepoint) |
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{ |
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$shouldCloseCurrentRange = $this->shouldCloseCurrentRangeWith($codepoint); |
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$shouldOpenNewRange = !$this->hasOpenRange() || $shouldCloseCurrentRange; |
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if ($shouldCloseCurrentRange) { |
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$this->closeCurrentRange(); |
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} |
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if ($shouldOpenNewRange) { |
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$this->openNewRangeWith($codepoint); |
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} |
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$this->previous = $codepoint; |
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} |
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/** |
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* @return bool |
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*/ |
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private function hasOpenRange() |
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{ |
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return $this->previous !== null; |
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} |
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/** |
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* @param Codepoint $codepoint |
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* @return bool |
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*/ |
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private function shouldCloseCurrentRangeWith(Codepoint $codepoint) |
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{ |
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return $this->hasOpenRange() |
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&& !$this->isPlusOneOfPrevious($codepoint); |
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} |
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/** |
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* @param Codepoint $codepoint |
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* @return bool |
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* @throws UnexpectedValueException |
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*/ |
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private function isPlusOneOfPrevious(Codepoint $codepoint) |
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{ |
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if ($this->previous === null) { |
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throw new UnexpectedValueException('Previous cannot be NULL'); |
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} |
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return $this->previous->getValue() + 1 === $codepoint->getValue(); |
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} |
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/** |
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* @param Codepoint $codepoint |
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*/ |
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private function openNewRangeWith(Codepoint $codepoint) |
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{ |
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$this->rangeStart = $codepoint; |
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} |
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/** |
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* @param Range $range |
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*/ |
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private function addRange(Range $range) |
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{ |
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array_push($this->aggregated, $range); |
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} |
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private function closeCurrentRange() |
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{ |
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$this->addRange($this->getCurrentRange()); |
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$this->rangeStart = null; |
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} |
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/** |
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* @return Range |
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* @throws UnexpectedValueException |
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*/ |
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private function getCurrentRange() |
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{ |
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if ($this->rangeStart === null || $this->previous === null) { |
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throw new UnexpectedValueException('Range values cannot be NULL'); |
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} |
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return Range::between($this->rangeStart, $this->previous); |
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} |
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/** |
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* @return Range[]|Range\Collection |
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*/ |
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public function getAggregated() |
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{ |
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$aggregated = $this->aggregated; |
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if ($this->hasOpenRange()) { |
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array_push($aggregated, $this->getCurrentRange()); |
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} |
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return new Range\Collection( |
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new \ArrayIterator($aggregated) |
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); |
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} |
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/** |
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* @return bool |
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*/ |
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public function hasAggregated() |
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{ |
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return count($this->getAggregated()) > 0; |
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} |
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} |
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nick-jones /
php-ucd
