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<?php |
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namespace PiedWeb\SeoPocketCrawler; |
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use League\Csv\Reader; |
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/** |
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* Page Rank Calculator. |
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*/ |
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class SimplePageRankCalculator |
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{ |
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/** |
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* @var CrawlerConfig |
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*/ |
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protected $config; |
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/** |
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* @var int |
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*/ |
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protected $pagesNbr; |
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/** |
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* @var array [id, pagerank] |
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*/ |
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protected $results; |
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protected $maxIteration = 10000; |
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/** |
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* @var array |
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*/ |
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protected $linksTo = []; |
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protected $nbrLinksFrom = []; |
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protected $dampingFactor = 0.85; |
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public function __construct(string $id, ?string $dataDirectory = null) |
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{ |
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$this->config = CrawlerConfig::loadFrom($id, $dataDirectory); |
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$this->initLinksIndex(); |
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$this->results = array_fill_keys(array_reverse(array_keys($this->linksTo)), null); |
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for ($iteration = 0; $iteration < $this->maxIteration; ++$iteration) { |
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$this->calcul(); |
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} |
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} |
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public function record() |
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{ |
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// merge it with previous data harvested |
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$data = $this->config->getDataFromPreviousCrawl(); |
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$urls = $data['urls']; |
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foreach ($urls as $k => $url) { |
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if (isset($this->results[$url->id])) { |
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$urls[$k]->pagerank = $this->results[$url->id]; |
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} |
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} |
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(new Recorder($this->config->getDataFolder(), $this->config->getCacheMethod()))->record($urls); |
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// return data filepath |
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return realpath($this->config->getDataFolder()).'/data.csv'; |
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} |
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protected function calcul() |
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{ |
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foreach ($this->results as $id => $pageRank) { |
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$sumPR = 0; |
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foreach ($this->getLinksTo($id) as $link) { |
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$sumPR = $sumPR + $this->results[$link] / $this->getNbrLinksFrom($link); |
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} |
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$this->results[$id] = $this->dampingFactor * $sumPR + (1 - $this->dampingFactor) / $this->getPagesNbr(); |
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} |
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} |
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protected function getPagesNbr() |
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{ |
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if (null !== $this->pagesNbr) { |
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return $this->pagesNbr; |
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} |
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return $this->pagesNbr = count($this->linksTo); |
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} |
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protected function getLinksTo(int $id): ?array |
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{ |
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return $this->linksTo[$id]; |
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} |
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protected function getNbrLinksFrom(int $id): ?int |
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{ |
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return $this->nbrLinksFrom[$id]; |
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} |
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protected function initLinksIndex() |
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{ |
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$csv = Reader::createFromPath($this->config->getDataFolder().Recorder::LINKS_DIR.'/Index.csv', 'r'); |
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$csv->setHeaderOffset(0); |
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$records = $csv->getRecords(); |
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foreach ($records as $r) { |
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if (!isset($this->linksTo[$r['To']])) { |
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$this->linksTo[$r['To']] = []; |
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} |
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$this->linksTo[$r['To']][] = $r['From']; |
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$this->nbrLinksFrom[$r['From']] = ($this->nbrLinksFrom[$r['From']] ?? 0) + 1; |
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} |
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} |
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} |
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PiedWeb /
SeoPocketCrawler
