private SentimentAnalysisResults ScoreValence(IList <double> sentiments, string text)
{
if (sentiments.Count == 0)
{
return(new SentimentAnalysisResults()); //will return with all 0
}
double sum = sentiments.Sum();
double puncAmplifier = PunctuationEmphasis(text);
sum += Math.Sign(sum) * puncAmplifier;
double compound = SentimentUtils.Normalize(sum);
SiftSentiments sifted = SiftSentimentScores(sentiments);
if (sifted.PosSum > Math.Abs(sifted.NegSum))
{
sifted.PosSum += puncAmplifier;
}
else if (sifted.PosSum < Math.Abs(sifted.NegSum))
{
sifted.NegSum -= puncAmplifier;
}
double total = sifted.PosSum + Math.Abs(sifted.NegSum) + sifted.NeuCount;
return(new SentimentAnalysisResults
{
Compound = Math.Round(compound, 4),
Positive = Math.Round(Math.Abs(sifted.PosSum / total), 3),
Negative = Math.Round(Math.Abs(sifted.NegSum / total), 3),
Neutral = Math.Round(Math.Abs(sifted.NeuCount / total), 3)
});
}
public SentiText(string text)
{
//TODO: Encode in UTF-8 ?
Text = text;
WordsAndEmoticons = GetWordsAndEmoticons();
IsCapDifferential = SentimentUtils.AllCapDifferential(WordsAndEmoticons);
}
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);
}
private double NeverCheck(double valence, IList <string> wordsAndEmoticons, int startI, int i)
{
if (startI == 0)
{
if (SentimentUtils.Negated(new List <string> {
wordsAndEmoticons[i - 1]
}))
{
valence = valence * SentimentUtils.NScalar;
}
}
if (startI == 1)
{
if (wordsAndEmoticons[i - 2] == "never" &&
(wordsAndEmoticons[i - 1] == "so" || wordsAndEmoticons[i - 1] == "this"))
{
valence = valence * 1.5;
}
else if (SentimentUtils.Negated(new List <string> {
wordsAndEmoticons[i - (startI + 1)]
}))
{
valence = valence * SentimentUtils.NScalar;
}
}
if (startI == 2)
{
if (wordsAndEmoticons[i - 3] == "never" &&
(wordsAndEmoticons[i - 2] == "so" || wordsAndEmoticons[i - 2] == "this") ||
(wordsAndEmoticons[i - 1] == "so" || wordsAndEmoticons[i - 1] == "this"))
{
valence = valence * 1.25;
}
else if (SentimentUtils.Negated(new List <string> {
wordsAndEmoticons[i - (startI + 1)]
}))
{
valence = valence * SentimentUtils.NScalar;
}
}
return(valence);
}
