Lexing for delete

location_of_delete_keyword.cpp

SourceLocation location_of_delete_keyword(FunctionDecl* FD, SourceManager& SM, const LangOptions& LO)
{
  // getSourceRange() of a CXXMethodDecl seems to include the "= delete"
  if(isa<CXXMethodDecl>(FD)) return FD->getSourceRange().getEnd();

  // we need to lex to find the end of "delete" for functions
  // that are not methods because their SourceRange omits
  // the trailing "= delete"
  SourceLocation loc = FD->getBeginLoc();
  SourceLocation result = FD->getEndLoc();

  while(true)
  {
    Optional<Token> token = Lexer::findNextToken(loc, SM, LO);
    if(not token)
    {
      break;
    }

    if(token->is(tok::eof))
    {
      break;
    }

    if(Lexer::getSpelling(*token, SM, LO) == "delete")
    {
      result = token->getLastLoc();
      break;
    }

    loc = token->getLocation().getLocWithOffset(token->getLength());
  }

  return result;
}