@Nullable
private static PsiReference findReferenceAt(final PsiFile psiFile, final int offset) {
if (psiFile == null) return null;
int offsetInElement = offset;
PsiElement child = psiFile.getFirstChild();
while (child != null) {
final int length = child.getTextLength();
if (length <= offsetInElement) {
offsetInElement -= length;
child = child.getNextSibling();
continue;
}
return child.findReferenceAt(offsetInElement);
}
return null;
}
