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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| <?php | ||
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| namespace alfmarks; | ||
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| class Query { | ||
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| public $term; | ||
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| public $regex; | ||
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| public $accuracy = 0.5; | ||
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| public function __construct($term) { | ||
| $this->term = $term; | ||
| } | ||
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| public function multiScore(array $words) { | ||
| $max = 0; | ||
| foreach ($words as $word) { | ||
| $max = max($max, $this->score($word)); | ||
| } | ||
| return $max; | ||
| } | ||
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| public function score($string) { | ||
| preg_match($this->regex(), $string, $matches); | ||
| $matched_chars = array_slice(array_values(array_filter($matches, 'strlen')), 2); | ||
| if (empty($matches)) return; | ||
| // How many characters you matched from the term | ||
| $positive_score = strlen(implode('', $matched_chars)) / strlen($this->term); | ||
| // Deductions for longer strings | ||
| $negative_score = abs(strlen($matches[1]) - strlen($this->term)) / 100; | ||
| return $positive_score - $negative_score; | ||
| } | ||
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| public function regex() { | ||
| if (!$this->regex) { | ||
| $this->regex = '/.*?(('; | ||
| $this->regex .= implode(')).*?|.*?((', array_map(function($gram) { | ||
| $gram_chars = str_split($gram); | ||
| return implode(').*?(', array_map(function($gram_char) { | ||
| return preg_quote($gram_char); | ||
| }, $gram_chars)); | ||
| }, $this->grams())); | ||
| $this->regex .= ')).*?/i'; | ||
| } | ||
| return $this->regex; | ||
| } | ||
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| public function grams() { | ||
| $max = strlen($this->term); | ||
| $min = ceil($this->accuracy * $max); | ||
| $grams = array(); | ||
| foreach (range($max, $min) as $length) { | ||
| $grams = array_merge($grams, $this->gramsByLength($length)); | ||
| } | ||
| return $grams; | ||
| } | ||
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| public function gramsByLength($length) { | ||
| $ngrams = array(); | ||
| $stop = strlen($this->term) - $length; | ||
| foreach (range(0, $stop) as $pos) { | ||
| $ngrams[] = substr($this->term, $pos, $length); | ||
| } | ||
| return $ngrams; | ||
| } | ||
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| } |
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