private static boolean containsLookahead()

in spectator-api/src/main/java/com/netflix/spectator/impl/matcher/PatternUtils.java [468:502]

• 35 lines of code
• 15 McCabe index (conditional complexity)

  private static boolean containsLookahead(Matcher matcher) {
    if (matcher instanceof NegativeLookaheadMatcher) {
      return true;
    } else if (matcher instanceof PositiveLookaheadMatcher) {
      return true;
    } else if (matcher instanceof IndexOfMatcher) {
      IndexOfMatcher m = matcher.as();
      return containsLookahead(m.next());
    } else if (matcher instanceof OrMatcher) {
      for (Matcher m : matcher.<OrMatcher>as().matchers()) {
        if (containsLookahead(m)) {
          return true;
        }
      }
      return false;
    } else if (matcher instanceof RepeatMatcher) {
      RepeatMatcher m = matcher.as();
      return containsLookahead(m.repeated());
    } else if (matcher instanceof SeqMatcher) {
      for (Matcher m : matcher.<SeqMatcher>as().matchers()) {
        if (containsLookahead(m)) {
          return true;
        }
      }
      return false;
    } else if (matcher instanceof ZeroOrMoreMatcher) {
      ZeroOrMoreMatcher m = matcher.as();
      return containsLookahead(m.repeated()) || containsLookahead(m.next());
    } else if (matcher instanceof ZeroOrOneMatcher) {
      ZeroOrOneMatcher m = matcher.as();
      return containsLookahead(m.repeated()) || containsLookahead(m.next());
    } else {
      return false;
    }
  }