public PsiElement resolve() {
    final String varName = getName();
    if (varName == null) {
      return null;
    }

    BashVarProcessor processor = new BashVarProcessor(this, true);
    if (!BashPsiUtils.varResolveTreeWalkUp(
        processor, this, getContainingFile(), ResolveState.initial())) {
      return processor.getBestResult(false, this);
    }

    return null;
  }
  private PsiElement internalResolve() {
    final String referencedName = getReferencedName();
    if (referencedName == null) {
      return null;
    }

    final BashFunctionProcessor processor = new BashFunctionProcessor(referencedName);

    boolean walkOn =
        PsiTreeUtil.treeWalkUp(processor, this, getContainingFile(), ResolveState.initial());
    if (!walkOn) {
      return processor.hasResults() ? processor.getBestResult(true, this) : null;
    }

    return null;
  }
  @org.jetbrains.annotations.NotNull
  public Object[] getVariants() {
    List<Object> variants = Lists.newArrayList();

    BashFunctionVariantsProcessor processor = new BashFunctionVariantsProcessor();
    PsiTreeUtil.treeWalkUp(processor, this, this.getContainingFile(), ResolveState.initial());

    variants.addAll(processor.getFunctionDefs());

    if (BashProjectSettings.storedSettings(getProject()).isAutocompleteBuiltinCommands()) {
      variants.addAll(LanguageBuiltins.commands);
    }

    if (BashProjectSettings.storedSettings(getProject()).isSupportBash4()) {
      variants.addAll(LanguageBuiltins.commands_v4);
    }

    return variants.toArray();
  }
  @NotNull
  private static MembersMap buildAllMaps(@NotNull PsiClass psiClass) {
    final List<Pair<PsiMember, PsiSubstitutor>> classes =
        new ArrayList<Pair<PsiMember, PsiSubstitutor>>();
    final List<Pair<PsiMember, PsiSubstitutor>> fields =
        new ArrayList<Pair<PsiMember, PsiSubstitutor>>();
    final List<Pair<PsiMember, PsiSubstitutor>> methods =
        new ArrayList<Pair<PsiMember, PsiSubstitutor>>();

    FilterScopeProcessor<MethodCandidateInfo> processor =
        new FilterScopeProcessor<MethodCandidateInfo>(
            new OrFilter(
                ElementClassFilter.METHOD, ElementClassFilter.FIELD, ElementClassFilter.CLASS)) {
          @Override
          protected void add(PsiElement element, PsiSubstitutor substitutor) {
            if (element instanceof PsiMethod) {
              methods.add(Pair.create((PsiMember) element, substitutor));
            } else if (element instanceof PsiField) {
              fields.add(Pair.create((PsiMember) element, substitutor));
            } else if (element instanceof PsiClass) {
              classes.add(Pair.create((PsiMember) element, substitutor));
            }
          }
        };
    processDeclarationsInClassNotCached(
        psiClass,
        processor,
        ResolveState.initial(),
        null,
        null,
        psiClass,
        false,
        PsiUtil.getLanguageLevel(psiClass));

    MembersMap result = new MembersMap(MemberType.class);
    result.put(MemberType.CLASS, generateMapByList(classes));
    result.put(MemberType.METHOD, generateMapByList(methods));
    result.put(MemberType.FIELD, generateMapByList(fields));
    return result;
  }
  @NotNull
  public Object[] getVariants() {
    List<Object> variants = Lists.newArrayList();

    // collect the previously declared variables
    final BashVarVariantsProcessor processor = new BashVarVariantsProcessor(this);
    PsiTreeUtil.treeWalkUp(processor, this, this.getContainingFile(), ResolveState.initial());

    variants.addAll(createPsiItems(processor.getVariables()));

    if (BashProjectSettings.storedSettings(getProject()).isAutocompleteBuiltinVars()) {
      variants.addAll(createItems(LanguageBuiltins.bashShellVars, BashIcons.BASH_VAR_ICON));
      variants.addAll(createItems(LanguageBuiltins.bourneShellVars, BashIcons.BOURNE_VAR_ICON));
    }

    if (BashProjectSettings.storedSettings(getProject()).isAutcompleteGlobalVars()) {
      variants.addAll(
          createItems(
              BashProjectSettings.storedSettings(getProject()).getGlobalVariables(),
              BashIcons.GLOBAL_VAR_ICON));
    }

    return variants.toArray();
  }
  private static boolean processDeclarationsInClassNotCached(
      @NotNull PsiClass aClass,
      @NotNull PsiScopeProcessor processor,
      @NotNull ResolveState state,
      @Nullable Set<PsiClass> visited,
      PsiElement last,
      @NotNull PsiElement place,
      boolean isRaw,
      @NotNull LanguageLevel languageLevel) {
    if (visited == null) visited = new THashSet<PsiClass>();
    if (!visited.add(aClass)) return true;
    processor.handleEvent(PsiScopeProcessor.Event.SET_DECLARATION_HOLDER, aClass);
    final ElementClassHint classHint = processor.getHint(ElementClassHint.KEY);
    final NameHint nameHint = processor.getHint(NameHint.KEY);

    if (classHint == null || classHint.shouldProcess(ElementClassHint.DeclarationKind.FIELD)) {
      if (nameHint != null) {
        final PsiField fieldByName = aClass.findFieldByName(nameHint.getName(state), false);
        if (fieldByName != null && !processor.execute(fieldByName, state)) return false;
      } else {
        final PsiField[] fields = aClass.getFields();
        for (final PsiField field : fields) {
          if (!processor.execute(field, state)) return false;
        }
      }
    }

    PsiElementFactory factory = JavaPsiFacade.getInstance(aClass.getProject()).getElementFactory();

    if (classHint == null || classHint.shouldProcess(ElementClassHint.DeclarationKind.METHOD)) {
      PsiSubstitutor baseSubstitutor = state.get(PsiSubstitutor.KEY);
      final PsiMethod[] methods =
          nameHint != null
              ? aClass.findMethodsByName(nameHint.getName(state), false)
              : aClass.getMethods();
      for (final PsiMethod method : methods) {
        PsiSubstitutor finalSubstitutor = checkRaw(isRaw, factory, method, baseSubstitutor);
        ResolveState methodState =
            finalSubstitutor == baseSubstitutor
                ? state
                : state.put(PsiSubstitutor.KEY, finalSubstitutor);
        if (!processor.execute(method, methodState)) return false;
      }
    }

    if (classHint == null || classHint.shouldProcess(ElementClassHint.DeclarationKind.CLASS)) {
      if (last != null && last.getParent() == aClass) {
        // Parameters
        final PsiTypeParameterList list = aClass.getTypeParameterList();
        if (list != null
            && !list.processDeclarations(processor, ResolveState.initial(), last, place))
          return false;
      }

      if (!(last instanceof PsiReferenceList) && !(last instanceof PsiModifierList)) {
        // Inners
        if (nameHint != null) {
          final PsiClass inner = aClass.findInnerClassByName(nameHint.getName(state), false);
          if (inner != null) {
            if (!processor.execute(inner, state)) return false;
          }
        } else {
          final PsiClass[] inners = aClass.getInnerClasses();
          for (final PsiClass inner : inners) {
            if (!processor.execute(inner, state)) return false;
          }
        }
      }
    }

    return last instanceof PsiReferenceList
        || processSuperTypes(
            aClass, processor, visited, last, place, state, isRaw, factory, languageLevel);
  }