private SentimentAnalysisResults ScoreValence(List <double> sentiments, SentiText text)
{
if (sentiments.Count == 0)
{
return(new SentimentAnalysisResults()); //will return with all 0
}
var sum = sentiments.Sum();
var puncAmplifier = PunctuationEmphasis(text.Text);
sum += Math.Sign(sum) * puncAmplifier;
var compound = SentimentUtils.Normalize(sum);
var sifted = SiftSentimentScores(sentiments);
if (sifted.PosSum > Math.Abs(sifted.NegSum))
{
sifted.PosSum += puncAmplifier;
}
else if (sifted.PosSum < Math.Abs(sifted.NegSum))
{
sifted.NegSum -= puncAmplifier;
}
var 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)
});
}
private double NeverCheck(double valence, List <string> lowerCaseWordsAndEmoticons, int startI, int i)
{
if (startI == 0)
{
if (SentimentUtils.Negated(new List <string> {
lowerCaseWordsAndEmoticons[i - 1]
}))
{
valence = valence * SentimentUtils.NScalar;
}
}
if (startI == 1)
{
if (lowerCaseWordsAndEmoticons[i - 2] == "never" &&
(lowerCaseWordsAndEmoticons[i - 1] == "so" ||
lowerCaseWordsAndEmoticons[i - 1] == "this"))
{
valence = valence * 1.5;
}
else if (SentimentUtils.Negated(new List <string> {
lowerCaseWordsAndEmoticons[i - (startI + 1)]
}))
{
valence = valence * SentimentUtils.NScalar;
}
}
if (startI == 2)
{
if (lowerCaseWordsAndEmoticons[i - 3] == "never" &&
(lowerCaseWordsAndEmoticons[i - 2] == "so" ||
lowerCaseWordsAndEmoticons[i - 2] == "this") ||
lowerCaseWordsAndEmoticons[i - 1] == "so" ||
lowerCaseWordsAndEmoticons[i - 1] == "this")
{
valence = valence * 1.25;
}
else if (SentimentUtils.Negated(new List <string> {
lowerCaseWordsAndEmoticons[i - (startI + 1)]
}))
{
valence = valence * SentimentUtils.NScalar;
}
}
return(valence);
}
private List <double> SentimentValence(double valence,
SentiText sentiText, string word,
string lowerCaseWord, int i,
List <double> sentiments)
{
if (!Lexicon.ContainsKey(lowerCaseWord))
{
sentiments.Add(valence);
return(sentiments);
}
var isCapDiff = sentiText.IsCapDifferential;
// adjust if shouting
valence = Lexicon[lowerCaseWord];
if (isCapDiff && word.IsUpper())
{
if (valence > 0)
{
valence += SentimentUtils.CIncr;
}
else
{
valence -= SentimentUtils.CIncr;
}
}
for (var startI = 0; startI < 3 && i > startI; startI++)
{
var offset = i - (startI + 1);
var lcWord = sentiText.WordsAndEmoticonsLowerCase[offset];
if (Lexicon.ContainsKey(lcWord))
{
continue;
}
var s = SentimentUtils.ScalarIncDec(lcWord,
sentiText.WordsAndEmoticons[offset], valence, isCapDiff);
if (startI == 1 && !s.Equals(0))
{
s = s * 0.95;
}
if (startI == 2 && !s.Equals(0))
{
s = s * 0.9;
}
valence = valence + s;
valence = NeverCheck(valence, sentiText.WordsAndEmoticonsLowerCase, startI, i);
if (startI == 2)
{
valence = IdiomsCheck(valence, sentiText.WordsAndEmoticonsLowerCase, i);
}
}
valence = LeastCheck(valence, sentiText.WordsAndEmoticonsLowerCase, i);
sentiments.Add(valence);
return(sentiments);
}
