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<?php declare(strict_types=1); |
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namespace Goose\Text; |
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use Goose\Configuration; |
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/** |
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* Stop Words |
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* |
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* @package Goose\Text |
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* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0 |
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*/ |
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class StopWords |
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{ |
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/** @var Configuration */ |
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private $config; |
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/** @var string[] */ |
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private $cached = []; |
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/** @var string[] */ |
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private $languages = [ |
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'ar', 'cs', 'da', 'de', 'en', 'es', |
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'fi', 'fr', 'hu', 'id', 'it', 'ja', |
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'ko', 'nb', 'nl', 'no', 'pl', 'pt', |
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'ru', 'sv', 'zh', 'vi' |
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]; |
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/** |
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* @param Configuration $config |
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*/ |
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public function __construct(Configuration $config) { |
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$this->config = $config; |
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} |
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/** |
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* @return Configuration |
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*/ |
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public function config(): Configuration { |
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return $this->config; |
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} |
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/** |
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* @param string $str |
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* |
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* @return string |
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*/ |
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public function removePunctuation(string $str): string { |
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return preg_replace("/[[:punct:]]+/", '', $str); |
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} |
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/** |
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* @return string |
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*/ |
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public function getLanguage(): string { |
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list($language) = explode('-', $this->config()->get('language')); |
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if (!in_array($language, $this->languages)) { |
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$language = 'en'; |
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} |
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return mb_strtolower($language); |
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} |
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/** |
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* @return mixed |
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*/ |
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public function getWordList(): array { |
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if (empty($this->cached)) { |
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$file = sprintf(__DIR__ . '/../../resources/text/stopwords-%s.txt', $this->getLanguage()); |
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$lines = explode("\n", str_replace(["\r\n", "\r"], "\n", file_get_contents($file))); |
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$this->cached = array_filter($lines, function($line) { |
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// Ignore emoty lines and lines starting with '#'. |
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return !(trim($line) == '' || mb_substr($line, 0, 1) == '#'); |
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}); |
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} |
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return $this->cached; |
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} |
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/** |
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* @param string $content |
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* |
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* @return WordStats |
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*/ |
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public function getStopwordCount(string $content): WordStats { |
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if (empty($content)) { |
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return new WordStats(); |
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} |
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$strippedInput = $this->removePunctuation($content); |
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$candidateWords = $this->getCandidateWords($strippedInput); |
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$overlappingStopWords = []; |
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foreach ($candidateWords as $w) { |
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if (in_array(mb_strtolower($w), $this->getWordList())) { |
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$overlappingStopWords[] = mb_strtolower($w); |
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} |
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} |
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return new WordStats([ |
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'wordCount' => count($candidateWords), |
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'stopWordCount' => count($overlappingStopWords), |
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'stopWords' => $overlappingStopWords, |
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]); |
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} |
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/** |
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* @param string $strippedInput |
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* |
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* @return array |
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*/ |
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public function getCandidateWords(string $strippedInput): array { |
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// Simple separating words in Japanese. |
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if ($this->getLanguage() === 'ja') { |
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$regexp = '/(' . implode('|', array_map('preg_quote', $this->getWordList())) . ')/'; |
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$strippedInput = preg_replace($regexp, ' $1 ', $strippedInput); |
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} |
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return explode(' ', $strippedInput); |
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} |
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} |
scotteh /
php-goose
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