/// <summary>
/// Smart tokenization storing the output in an array of CoreLabel
/// Sets the following fields:
/// - TextAnnotation - the text of the token
/// - TokenBeginAnnotation - the byte offset of the token (start)
/// - TokenEndAnnotation - the byte offset of the token (end)
/// </summary>
public virtual Word[] TokenizeToWords()
{
IList <RobustTokenizer.WordToken> toks = TokenizeToWordTokens();
Word[] labels = new Word[toks.Count];
for (int i = 0; i < toks.Count; i++)
{
RobustTokenizer.WordToken tok = toks[i];
Word l = new Word(tok.GetWord(), tok.GetStart(), tok.GetEnd());
labels[i] = l;
}
return(labels);
}
/// <summary>Tokenizes a natural language string</summary>
/// <returns>List of WordTokens</returns>
public virtual IList <RobustTokenizer.WordToken> TokenizeToWordTokens()
{
IList <RobustTokenizer.WordToken> result = new List <RobustTokenizer.WordToken>();
//
// replace illegal characters with SPACE
//
/*
* StringBuffer buffer = new StringBuffer();
* for(int i = 0; i < originalString.length(); i ++){
* int c = (int) originalString.charAt(i);
* //
* // regular character
* //
* if(c > 31 && c < 127) buffer.append((char) c);
*
* else{
* log.info("Control character at position " + i + ": " + c);
*
* //
* // DOS new line counts as two characters
* //
* if(c == 10) buffer.append(" ");
*
* //
* // other control character
* //
* else buffer.append(' ');
* }
* }
*/
Matcher match = wordPattern.Matcher(buffer);
int previousEndMatch = 0;
//
// Straight tokenization, ignoring known abbreviations
//
while (match.Find())
{
string crtMatch = match.Group();
int endMatch = match.End();
int startMatch = endMatch - crtMatch.Length;
int i;
// found word ending in "n't"
if (crtMatch.EndsWith("n't"))
{
if (crtMatch.Length > 3)
{
RobustTokenizer.WordToken token1 = new RobustTokenizer.WordToken(Sharpen.Runtime.Substring(crtMatch, 0, crtMatch.Length - 3), startMatch, endMatch - 3, CountNewLines(buffer, previousEndMatch, startMatch));
result.Add(token1);
}
RobustTokenizer.WordToken token2 = new RobustTokenizer.WordToken(Sharpen.Runtime.Substring(crtMatch, crtMatch.Length - 3, crtMatch.Length), endMatch - 3, endMatch, 0);
result.Add(token2);
}
else
{
// found word containing an appostrophe
// XXX: is this too relaxed? e.g. "O'Hare"
if ((i = HasApostropheBlock(crtMatch)) != -1)
{
RobustTokenizer.WordToken token1 = new RobustTokenizer.WordToken(Sharpen.Runtime.Substring(crtMatch, 0, i), startMatch, startMatch + i, CountNewLines(buffer, previousEndMatch, startMatch));
RobustTokenizer.WordToken token2 = new RobustTokenizer.WordToken(Sharpen.Runtime.Substring(crtMatch, i, crtMatch.Length), startMatch + i, endMatch, 0);
result.Add(token1);
result.Add(token2);
}
else
{
// just a regular word
RobustTokenizer.WordToken token = new RobustTokenizer.WordToken(crtMatch, startMatch, endMatch, CountNewLines(buffer, previousEndMatch, startMatch));
result.Add(token);
}
}
previousEndMatch = endMatch;
}
//
// Merge known abreviations
//
IList <RobustTokenizer.WordToken> resultWithAbs = new List <RobustTokenizer.WordToken>();
for (int i_1 = 0; i_1 < result.Count; i_1++)
{
// where the mw ends
int end = result.Count;
if (end > i_1 + MaxMultiWordSize)
{
end = i_1 + MaxMultiWordSize;
}
bool found = false;
// must have at least two tokens per multiword
for (; end > i_1 + 1; end--)
{
RobustTokenizer.WordToken startToken = result[i_1];
RobustTokenizer.WordToken endToken = result[end - 1];
if (CountNewLines(result, i_1, end) == 0)
{
// abbreviation tokens cannot appear on different lines
string conc = Concatenate(result, i_1, end);
found = false;
// found a multiword
if ((mAbbreviations.Contains(conc) == true))
{
found = true;
RobustTokenizer.WordToken token = new RobustTokenizer.WordToken(conc, startToken.GetStart(), endToken.GetEnd(), startToken.GetNewLineCount());
resultWithAbs.Add(token);
i_1 = end - 1;
break;
}
}
}
// no multiword starting at this position found
if (!found)
{
resultWithAbs.Add(result[i_1]);
}
}
resultWithAbs = Postprocess(resultWithAbs);
return(resultWithAbs);
}
public static AceToken WordTokenToAceToken(RobustTokenizer.WordToken wordToken, int sentence)
{
return(new AceToken(wordToken.GetWord(), string.Empty, string.Empty, string.Empty, string.Empty, int.ToString(wordToken.GetStart()), int.ToString(wordToken.GetEnd()), sentence));
}
