public void collectNavigationMarkers()

in src/org/intellij/grammar/editor/BnfRuleLineMarkerProvider.java [38:84]
47 lines of code
21 McCabe index (conditional complexity)

  public void collectNavigationMarkers(@NotNull List<? extends PsiElement> elements,
                                       @NotNull Collection<? super RelatedItemLineMarkerInfo<?>> result,
                                       boolean forNavigation) {
    Set<PsiElement> visited = forNavigation ? new HashSet<>() : null;
    for (PsiElement element : elements) {
      PsiElement parent = element.getParent();
      boolean isRuleId = parent instanceof BnfRule && (forNavigation || element == ((BnfRule)parent).getId());
      if (!(isRuleId || forNavigation && element instanceof BnfExpression)) continue;
      List<PsiElement> items = new ArrayList<>();
      NavigatablePsiElement method = getMethod(element);
      if (method != null && (!forNavigation || visited.add(method))) {
        items.add(method);
      }
      boolean hasPSI = false;
      if (isRuleId) {
        BnfRule rule = RuleGraphHelper.getSynonymTargetOrSelf((BnfRule)parent);
        if (RuleGraphHelper.hasPsiClass(rule)) {
          hasPSI = true;
          JavaHelper javaHelper = JavaHelper.getJavaHelper(rule);
          Couple<String> names = ParserGeneratorUtil.getQualifiedRuleClassName(rule);
          for (String className : new String[]{names.first, names.second}) {
            NavigatablePsiElement aClass = javaHelper.findClass(className);
            if (aClass != null && (!forNavigation || visited.add(aClass))) {
              items.add(aClass);
            }
          }
        }
      }
      if (!items.isEmpty()) {
        AnAction action = ActionManager.getInstance().getAction("GotoRelated");
        String tooltipAd = "";
        String popupTitleAd = "";
        if (action != null) {
          String shortcutText = KeymapUtil.getFirstKeyboardShortcutText(action);
          String actionText = StringUtil.isEmpty(shortcutText) ? "'" + action.getTemplatePresentation().getText() + "' action" : shortcutText;
          tooltipAd = "\nGo to sub-expression code via " + actionText;
          popupTitleAd = " (for sub-expressions use " + actionText + ")";
        }
        String title = "parser " + (hasPSI ? "and PSI " : "") + "code";
        NavigationGutterIconBuilder<PsiElement> builder = NavigationGutterIconBuilder.create(BnfIcons.RELATED_METHOD).
          setTargets(items).
          setTooltipText("Click to navigate to "+title + tooltipAd).
          setPopupTitle(StringUtil.capitalize(title) + popupTitleAd);
        result.add(builder.createLineMarkerInfo(element));
      }
    }
  }