示例#1
0
  private NamesByExprInfo suggestVariableNameByExpressionPlace(
      PsiExpression expr, final VariableKind variableKind, boolean correctKeywords) {
    if (expr.getParent() instanceof PsiExpressionList) {
      PsiExpressionList list = (PsiExpressionList) expr.getParent();
      PsiElement listParent = list.getParent();
      PsiSubstitutor subst = PsiSubstitutor.EMPTY;
      PsiMethod method = null;
      if (listParent instanceof PsiMethodCallExpression) {
        final JavaResolveResult resolveResult =
            ((PsiMethodCallExpression) listParent).getMethodExpression().advancedResolve(false);
        method = (PsiMethod) resolveResult.getElement();
        subst = resolveResult.getSubstitutor();
      } else {
        if (listParent instanceof PsiAnonymousClass) {
          listParent = listParent.getParent();
        }
        if (listParent instanceof PsiNewExpression) {
          method = ((PsiNewExpression) listParent).resolveConstructor();
        }
      }

      if (method != null) {
        final PsiElement navElement = method.getNavigationElement();
        if (navElement instanceof PsiMethod) {
          method = (PsiMethod) navElement;
        }
        PsiExpression[] expressions = list.getExpressions();
        int index = -1;
        for (int i = 0; i < expressions.length; i++) {
          if (expressions[i] == expr) {
            index = i;
            break;
          }
        }
        PsiParameter[] parameters = method.getParameterList().getParameters();
        if (index < parameters.length) {
          String name = parameters[index].getName();
          if (name != null
              && TypeConversionUtil.areTypesAssignmentCompatible(
                  subst.substitute(parameters[index].getType()), expr)) {
            name = variableNameToPropertyName(name, VariableKind.PARAMETER);
            String[] names = getSuggestionsByName(name, variableKind, false, correctKeywords);
            if (expressions.length == 1) {
              final String methodName = method.getName();
              String[] words = NameUtil.nameToWords(methodName);
              if (words.length > 0) {
                final String firstWord = words[0];
                if (SET_PREFIX.equals(firstWord)) {
                  final String propertyName = methodName.substring(firstWord.length());
                  final String[] setterNames =
                      getSuggestionsByName(propertyName, variableKind, false, correctKeywords);
                  names = ArrayUtil.mergeArrays(names, setterNames);
                }
              }
            }
            return new NamesByExprInfo(name, names);
          }
        }
      }
    } else if (expr.getParent() instanceof PsiAssignmentExpression
        && variableKind == VariableKind.PARAMETER) {
      final PsiAssignmentExpression assignmentExpression =
          (PsiAssignmentExpression) expr.getParent();
      if (expr == assignmentExpression.getRExpression()) {
        final PsiExpression leftExpression = assignmentExpression.getLExpression();
        if (leftExpression instanceof PsiReferenceExpression
            && ((PsiReferenceExpression) leftExpression).getQualifier() == null) {
          String name = leftExpression.getText();
          if (name != null) {
            final PsiElement resolve = ((PsiReferenceExpression) leftExpression).resolve();
            if (resolve instanceof PsiVariable) {
              name = variableNameToPropertyName(name, getVariableKind((PsiVariable) resolve));
            }
            String[] names = getSuggestionsByName(name, variableKind, false, correctKeywords);
            return new NamesByExprInfo(name, names);
          }
        }
      }
    }

    return new NamesByExprInfo(null, ArrayUtil.EMPTY_STRING_ARRAY);
  }
  @NotNull
  private static LookupElement castQualifier(
      @NotNull LookupElement item,
      @Nullable final PsiTypeLookupItem castTypeItem,
      @Nullable PsiType plainQualifier,
      JavaCompletionProcessor processor) {
    if (castTypeItem == null) {
      return item;
    }
    if (plainQualifier != null) {
      Object o = item.getObject();
      if (o instanceof PsiMethod) {
        PsiType castType = castTypeItem.getType();
        if (plainQualifier instanceof PsiClassType && castType instanceof PsiClassType) {
          PsiMethod method = (PsiMethod) o;
          PsiClassType.ClassResolveResult plainResult =
              ((PsiClassType) plainQualifier).resolveGenerics();
          PsiClass plainClass = plainResult.getElement();
          if (plainClass != null && plainClass.findMethodBySignature(method, true) != null) {
            PsiClass castClass = ((PsiClassType) castType).resolveGenerics().getElement();

            if (castClass == null || !castClass.isInheritor(plainClass, true)) {
              return item;
            }

            PsiSubstitutor plainSub = plainResult.getSubstitutor();
            PsiSubstitutor castSub =
                TypeConversionUtil.getSuperClassSubstitutor(plainClass, (PsiClassType) castType);
            PsiType returnType = method.getReturnType();
            if (method.getSignature(plainSub).equals(method.getSignature(castSub))) {
              PsiType typeAfterCast = toRaw(castSub.substitute(returnType));
              PsiType typeDeclared = toRaw(plainSub.substitute(returnType));
              if (typeAfterCast != null
                  && typeDeclared != null
                  && typeAfterCast.isAssignableFrom(typeDeclared)
                  && processor.isAccessible(plainClass.findMethodBySignature(method, true))) {
                return item;
              }
            }
          }
        }
      } else if (containsMember(plainQualifier, o)) {
        return item;
      }
    }

    return LookupElementDecorator.withInsertHandler(
        item,
        new InsertHandlerDecorator<LookupElement>() {
          @Override
          public void handleInsert(
              InsertionContext context, LookupElementDecorator<LookupElement> item) {
            final Document document = context.getEditor().getDocument();
            context.commitDocument();
            final PsiFile file = context.getFile();
            final PsiJavaCodeReferenceElement ref =
                PsiTreeUtil.findElementOfClassAtOffset(
                    file, context.getStartOffset(), PsiJavaCodeReferenceElement.class, false);
            if (ref != null) {
              final PsiElement qualifier = ref.getQualifier();
              if (qualifier != null) {
                final CommonCodeStyleSettings settings = context.getCodeStyleSettings();

                final String parenSpace = settings.SPACE_WITHIN_PARENTHESES ? " " : "";
                document.insertString(qualifier.getTextRange().getEndOffset(), parenSpace + ")");

                final String spaceWithin = settings.SPACE_WITHIN_CAST_PARENTHESES ? " " : "";
                final String prefix = "(" + parenSpace + "(" + spaceWithin;
                final String spaceAfter = settings.SPACE_AFTER_TYPE_CAST ? " " : "";
                final int exprStart = qualifier.getTextRange().getStartOffset();
                document.insertString(exprStart, prefix + spaceWithin + ")" + spaceAfter);

                CompletionUtil.emulateInsertion(context, exprStart + prefix.length(), castTypeItem);
                PsiDocumentManager.getInstance(file.getProject())
                    .doPostponedOperationsAndUnblockDocument(document);
                context.getEditor().getCaretModel().moveToOffset(context.getTailOffset());
              }
            }

            item.getDelegate().handleInsert(context);
          }
        });
  }