113 líneas
3,4 KiB
PHP
113 líneas
3,4 KiB
PHP
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<?php
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/*
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Identify sentiment-relevant string-level properties of input text.
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*/
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const PUNC_LIST = [".", "!", "?", ",", ";", ":", "-", "'", "\"",
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"!!", "!!!", "??", "???", "?!?", "!?!", "?!?!", "!?!?"];
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class SentiText {
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private $text = "";
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public $words_and_emoticons = null;
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public $is_cap_diff = null;
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function __construct($text){
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//checking that is string
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//if (!isinstance(text, str)){
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// text = str(text.encode('utf-8'));
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//}
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$this->text = $text;
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$this->words_and_emoticons = $this->_words_and_emoticons();
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// doesn't separate words from\
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// adjacent punctuation (keeps emoticons & contractions)
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$this->is_cap_diff = $this->allcap_differential($this->words_and_emoticons);
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}
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/*
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Remove all punctation from a string
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*/
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function strip_punctuation($string) {
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//$string = strtolower($string);
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return preg_replace("/[[:punct:]]+/", "", $string);
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}
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function array_count_values_of($haystack, $needle) {
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if(!in_array($needle,$haystack)){
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return 0;
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}
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$counts = array_count_values($haystack);
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return $counts[$needle];
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}
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/*
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Check whether just some words in the input are ALL CAPS
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:param list words: The words to inspect
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:returns: `True` if some but not all items in `words` are ALL CAPS
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*/
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private function allcap_differential($words){
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$is_different = false;
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$allcap_words = 0;
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foreach($words as $word){
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//ctype is affected by the local of the processor see manual for more details
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if(ctype_upper($word)){
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$allcap_words += 1;
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}
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}
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$cap_differential = count($words) - $allcap_words;
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if ($cap_differential > 0 && $cap_differential < count($words)){
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$is_different = true;
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}
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return $is_different;
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}
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function _words_only(){
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$text_mod = $this->strip_punctuation($this->text);
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// removes punctuation (but loses emoticons & contractions)
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$words_only = preg_split('/\s+/',$text_mod);
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# get rid of empty items or single letter "words" like 'a' and 'I'
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$works_only = array_filter($words_only,function($word){ return strlen($word) > 1; });
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return $words_only;
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}
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function _words_and_emoticons(){
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$wes = preg_split('/\s+/',$this->text);
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# get rid of residual empty items or single letter words
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$wes = array_filter($wes,function($word){ return strlen($word) > 1; });
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//Need to remap the indexes of the array
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$wes = array_values ($wes);
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$words_only = $this->_words_only();
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foreach($words_only as $word){
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foreach(PUNC_LIST as $punct){
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//replace all punct + word combinations with word
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$pword = $punct .$word;
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$x1 = $this->array_count_values_of($wes,$pword);
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while ($x1 > 0){
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$i = array_search($pword,$wes);
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unset($wes[$i]);
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array_splice($wes,$i,0,$word);
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$x1 = $this->array_count_values_of($wes,$pword);
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}
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//Do the same as above but word then punct
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$wordp = $word . $punct;
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$x2 = $this->array_count_values_of($wes, $wordp);
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while ($x2 > 0){
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$i = array_search($wordp, $wes);
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unset($wes[$i]);
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array_splice($wes,$i,0,$word);
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$x2 = $this->array_count_values_of($wes, $wordp);
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}
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}
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}
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return $wes;
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}
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}
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?>
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