private IList <double> SentimentValence(double valence, SentiText sentiText, string item, int i, IList <double> sentiments)
{
string itemLowerCase = item.ToLower();
if (!Lexicon.ContainsKey(itemLowerCase))
{
sentiments.Add(valence);
return(sentiments);
}
bool isCapDiff = sentiText.IsCapDifferential;
IList <string> wordsAndEmoticons = sentiText.WordsAndEmoticons;
valence = Lexicon[itemLowerCase];
if (isCapDiff && item.IsUpper())
{
if (valence > 0)
{
valence += SentimentUtils.CIncr;
}
else
{
valence -= SentimentUtils.CIncr;
}
}
for (int startI = 0; startI < 3; startI++)
{
if (i > startI && !Lexicon.ContainsKey(wordsAndEmoticons[i - (startI + 1)].ToLower()))
{
double s = SentimentUtils.ScalarIncDec(wordsAndEmoticons[i - (startI + 1)], valence, isCapDiff);
if (startI == 1 && s != 0)
{
s = s * 0.95;
}
if (startI == 2 && s != 0)
{
s = s * 0.9;
}
valence = valence + s;
valence = NeverCheck(valence, wordsAndEmoticons, startI, i);
if (startI == 2)
{
valence = IdiomsCheck(valence, wordsAndEmoticons, i);
}
}
}
valence = LeastCheck(valence, wordsAndEmoticons, i);
sentiments.Add(valence);
return(sentiments);
}
/// <summary>
/// Return metrics for positive, negative and neutral sentiment based on the input text.
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public SentimentAnalysisResults PolarityScores(string input)
{
SentiText sentiText = new SentiText(input);
IList <double> sentiments = new List <double>();
IList <string> wordsAndEmoticons = sentiText.WordsAndEmoticons;
for (int i = 0; i < wordsAndEmoticons.Count; i++)
{
string item = wordsAndEmoticons[i];
double valence = 0;
if (i < wordsAndEmoticons.Count - 1 && item.ToLower() == "kind" && wordsAndEmoticons[i + 1] == "of" ||
SentimentUtils.BoosterDict.ContainsKey(item.ToLower()))
{
sentiments.Add(valence);
continue;
}
sentiments = SentimentValence(valence, sentiText, item, i, sentiments);
}
sentiments = ButCheck(wordsAndEmoticons, sentiments);
return(ScoreValence(sentiments, input));
}
