/**
* Attempts to find the next subsequence of the input sequence that matches the pattern.
*
* <p>This method starts at the beginning of the input sequence or, if a previous invocation of
* the method was successful and the matcher has not since been reset, at the first character not
* matched by the previous match.
*
* @return the index of the first occurrence of the search string, starting at the specified
* offset, or -1 if no occurrence was found.
*/
public int findNext() {
// Don't match empty strings and don't match if we are at the end of the document.
if (findString.length() == 0 || document.getLength() - findString.length() < startIndex) {
return -1;
}
try {
int nextMatch = 0; // index of next matching character
// Iterate through all segments of the document starting from offset
Segment text = new Segment();
text.setPartialReturn(true);
int offset = startIndex;
int nleft = document.getLength() - startIndex;
while (nleft > 0) {
document.getText(offset, nleft, text);
// Iterate through the characters in the current segment
char next = text.first();
for (text.first(); next != Segment.DONE; next = text.next()) {
// Check if the current character matches with the next
// search character.
char current = text.current();
if (current == matchUpperCase[nextMatch] || current == matchLowerCase[nextMatch]) {
nextMatch++;
// Did we match all search characters?
if (nextMatch == matchLowerCase.length) {
int foundIndex =
text.getIndex() - text.getBeginIndex() + offset - matchLowerCase.length + 1;
if (matchType == MatchType.CONTAINS) {
return foundIndex;
// break; <- never reached
} else if (matchType == MatchType.STARTS_WITH) {
if (!isWordChar(foundIndex - 1)) {
return foundIndex;
}
} else if (matchType == MatchType.FULL_WORD) {
if (!isWordChar(foundIndex - 1)
&& !isWordChar(foundIndex + matchLowerCase.length)) {
return foundIndex;
}
}
nextMatch = 0;
}
} else {
nextMatch = 0;
}
}
// Move forward to the next segment
nleft -= text.count;
offset += text.count;
}
return -1;
} catch (BadLocationException e) {
throw new IndexOutOfBoundsException();
}
}
/** This helper method will return the end of the next word in the buffer. */
private static int getNextWordEnd(Segment text, int startPos) {
for (char ch = text.setIndex(startPos); ch != Segment.DONE; ch = text.next()) {
if (!Character.isLetterOrDigit(ch)) {
return text.getIndex();
}
}
return text.getEndIndex();
}
