/**
* Returns the block balance, i.e. zero if the blocks are balanced at <code>offset</code>, a
* negative number if there are more closing than opening braces, and a positive number if there
* are more opening than closing braces.
*
* @param document the document
* @param offset the offset
* @param partitioning the partitioning
* @return the block balance
*/
private static int getBlockBalance(IDocument document, int offset, String partitioning) {
if (offset < 1) return -1;
if (offset >= document.getLength()) return 1;
int begin = offset;
int end = offset - 1;
JavaHeuristicScanner scanner = new JavaHeuristicScanner(document);
while (true) {
begin = scanner.findOpeningPeer(begin - 1, '{', '}');
end = scanner.findClosingPeer(end + 1, '{', '}');
if (begin == -1 && end == -1) return 0;
if (begin == -1) return -1;
if (end == -1) return 1;
}
}
