/// <summary>
/// Filters a tweet both on illegal characters and bad words
/// </summary>
/// <param name="tweet">Tweet that needs to be filtered</param>
/// <returns>Filtered tweet or null if illegal tweet</returns>
public Tweet FilterTweet(Tweet tweet)
{
if (tweet == null) return null;
else if (FilterWords(tweet)) return FilterChars(tweet);
return null;
}
/// <summary>
/// Filters a tweet on illegal characters
/// </summary>
/// <param name="tweet">Tweet that needs to be filtered on illegal characters/param>
/// <returns>Filtered tweet</returns>
private Tweet FilterChars(Tweet tweet)
{
StringBuilder newText = new StringBuilder();
bool appended = false;
foreach (char w in tweet.Text.ToCharArray())
{
// Check if we can translate the character
foreach (DictionaryEntry pair in translateCharacters)
{
if (w.ToLower() == (char)pair.Key)
{
newText.Append(pair.Value);
appended = true;
break;
}
}
// Check if we were able to map the character to another character, else check if illegal
if (!appended)
{
foreach (char c in illegalCharacters)
{
if (w.ToLower() == c)
{
appended = true;
newText.Append(" ");
break;
}
}
}
if (!appended) newText.Append(w);
appended = false;
}
tweet.Text = newText.ToString().ToUpper();
return tweet;
}
/// <summary>
/// Filters a tweet on bad words
/// </summary>
/// <param name="tweet">Tweet that needs to be filtered on bad words</param>
/// <returns>Filtered tweet or null if illegal tweet</returns>
private bool FilterWords(Tweet tweet)
{
foreach (string woord in slechteWoorden)
{
foreach (string tweetWoord in tweet.Text.Split(' '))
{
if (tweetWoord.ToLower() == woord.ToLower())
{
return false;
}
}
}
return true;
}