/**
* Tokenize some text - not thread safe.
*
* @param text tokenize this
* @return tokenized text
*/
public List<List<Token>> process(final String text) {
final List<List<Token>> paragraph = new ArrayList<>();
currentSentence = new ArrayList<>();
final Tokens tokens = splitText(text);
while (tokens.hasNext()) {
final Token t = tokens.next();
final String trimmedWord = t.text.trim();
// skip spaces
if (trimmedWord.isEmpty()) continue;
if (((mode == WITH_PUNCTUATION)
|| (mode == WITHOUT_PUNCTUATION && isLetterOrDigit(initChar(t.text))))) {
boolean canBreakSentence = true;
if (t.text.contains("'")) {
wordContainsApostrophe(t);
} else if (".".equals(trimmedWord)) {
canBreakSentence = wordIsFullStop(t);
} else if (":".equals(trimmedWord)) {
wordIsColon(tokens, t);
} else currentSentence.add(t);
// handling the end of a sentence
if (canBreakSentence && equalss(trimmedWord, ".", ";", "?", "!")) {
paragraph.add(currentSentence);
currentSentence = new ArrayList<>();
}
}
}
if (!currentSentence.isEmpty()) paragraph.add(currentSentence);
return paragraph;
}
private void wordIsColon(final Tokens tokens, final Token t) {
// check we can get a previous and next word to merge together
if (!currentSentence.isEmpty() && tokens.hasNext()) {
// if the colon does not have a space on either side
if (!isSpaceChar(lastChar(tokens.peekPrev().text))
&& !isSpaceChar(initChar(tokens.peekNext().text))) {
// try to merge the 3 tokens back together again
final int prevWordIndex = currentSentence.size() - 1;
final Token prevSentenceWord = currentSentence.get(prevWordIndex);
mergeWordsIntoSentence(prevSentenceWord, t, tokens.next(), prevWordIndex);
} else currentSentence.add(t);
} else currentSentence.add(t);
}
public static Expr parse(Tokens tokens) {
int pos = tokens.getPosition();
Expr firstExpr = MultiplyExpr.parse(tokens);
if (firstExpr == null) {
tokens.setPosition(pos);
return null;
}
List<Expr> multiplyExprs = new LinkedList<Expr>();
multiplyExprs.add(firstExpr);
BitSet operators = new BitSet();
for (int i = 0; tokens.hasNext(); i++) {
char operator = tokens.nextChar();
if (operator == '+' || operator == '-') {
Expr nextExpr = MultiplyExpr.parse(tokens);
if (nextExpr == null) {
throw new QuerySyntaxException(tokens);
}
multiplyExprs.add(nextExpr);
if (operator == '+') {
operators.set(i);
}
} else {
tokens.pushback();
break;
}
}
return multiplyExprs.size() == 1 ? firstExpr : new AdditiveExpr(multiplyExprs, operators);
}