/// <summary>
/// Analyzes the specified phrase.
/// </summary>
/// <param name="phrase">The phrase.</param>
/// <returns></returns>
public SentimentalInfo Analyze(string phrase)
{
string str = Util.ToUnicode(phrase);
SentenceInfo pos = this.Positivity(str);
SentenceInfo neg = this.Negativity(str);
SentimentalInfo result = new SentimentalInfo();
result.Positives = pos;
result.Negatives = neg;
result.Score = decimal.Divide((pos.Score - neg.Score), 10);
result.Comparative = decimal.Divide(pos.Comparative - neg.Comparative, 10);
result.Comparative = Math.Round(result.Comparative, 2, MidpointRounding.ToEven);
return(result);
}
/// <summary>
/// Negativities the specified phrase.
/// </summary>
/// <param name="phrase">The phrase.</param>
/// <returns></returns>
private SentenceInfo Negativity(string phrase)
{
string strNormalized = Normalize(phrase); // Create a temp copy
int hits = 0;
List <string> tokens = strNormalized.ToLowerInvariant().Split(' ').ToList <string>();
List <string> words = new List <string>();
List <string> adjectives = new List <string>();
for (int i = 0; i < tokens.Count; i++)
{
if (this.IsWord(tokens[i]) == true)
{
hits += 1;
words.Add(tokens[i]);
}
if (this.IsAdjective(tokens[i], negatives) == true)
{
if (i != 0)
{
if (this.IsAdjective(tokens[i - 1], positives) == true)
{
continue;
}
}
hits *= 2;
adjectives.Add(tokens[i]);
}
}
SentenceInfo sentenceInfo = new SentenceInfo();
sentenceInfo.Score = hits;
sentenceInfo.Comparative = decimal.Divide(hits, tokens.Count);
sentenceInfo.Words = words.ToArray();
sentenceInfo.Adjectives = adjectives.ToArray();
return(sentenceInfo);
}
/// <summary>
/// Positivities the specified phrase.
/// </summary>
/// <param name="phrase">The phrase.</param>
/// <returns></returns>
private SentenceInfo Positivity(string phrase)
{
string strNormalized = Normalize(phrase); // Create a temp copy
int hits = 0;
List<string> tokens = strNormalized.ToLowerInvariant().Split(' ').ToList<string>();
List<string> words = new List<string>();
List<string> adjectives = new List<string>();
for (int i = 0; i < tokens.Count; i++)
{
if (this.IsWord(tokens[i]) == true)
{
hits += 1;
words.Add(tokens[i]);
}
if (this.IsAdjective(tokens[i], positives) == true)
{
if (i != 0)
{
if (this.IsAdjective(tokens[i - 1], negatives) == true)
{
continue;
}
}
hits *= 2;
adjectives.Add(tokens[i]);
}
}
SentenceInfo sentenceInfo = new SentenceInfo();
sentenceInfo.Score = hits;
sentenceInfo.Comparative = decimal.Divide(hits, tokens.Count);
sentenceInfo.Words = words.ToArray();
sentenceInfo.Adjectives = adjectives.ToArray();
return sentenceInfo;
}