JavaHeuristicScanner scanner = new JavaHeuristicScanner(document);
int nextToken = scanner.nextToken(offset + length, endLine.getOffset() + endLine.getLength());
String next =
nextToken == Symbols.TokenEOF ? null : document.get(offset, scanner.getPosition() - offset).trim();
int prevToken = scanner.previousToken(offset - 1, startLine.getOffset());
int prevTokenOffset = scanner.getPosition() + 1;
String previous =
prevToken == Symbols.TokenEOF ? null : document.get(prevTokenOffset, offset - prevTokenOffset)
.trim();