com.intellij.psi.PsiReferenceBase#com.intellij.psi.PsiReference源码实例Demo

@Test
public void testLabelFragmentReferenceFound() {
  BuildFile foo =
      createBuildFile(
          new WorkspacePath("java/com/google/foo/BUILD"), "java_library(name = \"lib\")");

  BuildFile bar =
      createBuildFile(
          new WorkspacePath("java/com/google/bar/BUILD"),
          "java_library(name = \"lib2\", exports = [\"//java/com/google/foo:lib\"])");

  PsiReference[] references = FindUsages.findAllReferences(foo);
  assertThat(references).hasLength(1);

  PsiElement ref = references[0].getElement();
  assertThat(ref).isInstanceOf(StringLiteral.class);
  assertThat(ref.getContainingFile()).isEqualTo(bar);
}
 

public void testGoToSymbolFunction_QualifiedImportQualifierresolvesMultipleCons_Cons2() {
    PsiFile[] psiFiles = myFixture.configureByFiles(
            "QualifiedImport_QualifierResolvesMultipleCons_Cons2/Usage.hs",
            "QualifiedImport_QualifierResolvesMultipleCons_Cons2/Definition.hs"
    );
    PsiFile usage = psiFiles[0];
    String textOfFile = usage.getText();
    int expectedStartOffset = textOfFile.indexOf("as Def.Lef") + 7;
    PsiElement psiElement = usage
            .findElementAt(myFixture.getCaretOffset()).getParent();
    HaskellConid conId = (HaskellConid) psiElement;
    PsiReference reference = conId.getReference();
    HaskellConid referencedElement = (HaskellConid) reference.resolve();
    assertNotSame(psiElement, referencedElement);
    assertEquals(expectedStartOffset, referencedElement.getTextRange().getStartOffset());
}
 

@Test
public void testBasicResolveUnknownGlobalVariable() throws Exception {
    final PsiReference psiReference = configure();

    //must not resolve because the definition is local due to the previous definition
    PsiElement varDef = psiReference.resolve();
    Assert.assertNull("The vardef should not be found, because it is undefined", varDef);

    //the variable must not be a valid reference to the following var def

    final AtomicInteger visited = new AtomicInteger(0);
    psiReference.getElement().getContainingFile().acceptChildren(new PsiRecursiveElementVisitor() {
        @Override
        public void visitElement(PsiElement element) {
            if (element instanceof BashVarDef) {
                visited.incrementAndGet();
                Assert.assertFalse("A var def must not be a valid definition for the variable used.",
                        psiReference.isReferenceTo(element));
            }

            super.visitElement(element);
        }
    });
    Assert.assertEquals(1, visited.get());
}
 

@Nullable
private static PsiElement findTargetMember(@Nullable PsiElement element) {
  if (element == null) return null;
  final ChangeSignatureHandler fileHandler = getChangeSignatureHandler(element.getLanguage());
  if (fileHandler != null) {
    final PsiElement targetMember = fileHandler.findTargetMember(element);
    if (targetMember != null) return targetMember;
  }
  PsiReference reference = element.getReference();
  if (reference == null && element instanceof PsiNameIdentifierOwner) {
    return element;
  }
  if (reference != null) {
    return reference.resolve();
  }
  return null;
}
 

private JSGraphQLEndpointFieldDefinition getOverriddenField(JSGraphQLEndpointFieldDefinition override) {
	final String propertyName = override.getProperty().getIdentifier().getText();
	final JSGraphQLEndpointObjectTypeDefinition typeDefinition = PsiTreeUtil.getParentOfType(override, JSGraphQLEndpointObjectTypeDefinition.class);
	if (typeDefinition != null) {
		final JSGraphQLEndpointImplementsInterfaces implementsInterfaces = PsiTreeUtil.findChildOfType(typeDefinition, JSGraphQLEndpointImplementsInterfaces.class);
		if (implementsInterfaces != null) {
			for (JSGraphQLEndpointNamedType namedType : implementsInterfaces.getNamedTypeList()) {
				final PsiReference reference = namedType.getReference();
				if (reference != null) {
					final PsiElement interfaceTypeName = reference.resolve();
					if (interfaceTypeName != null) {
						final JSGraphQLEndpointInterfaceTypeDefinition interfaceTypeDefinition = PsiTreeUtil.getParentOfType(interfaceTypeName, JSGraphQLEndpointInterfaceTypeDefinition.class);
						if (interfaceTypeDefinition != null) {
							for (JSGraphQLEndpointProperty property : PsiTreeUtil.findChildrenOfType(interfaceTypeDefinition, JSGraphQLEndpointProperty.class)) {
								if (property.getIdentifier().getText().equals(propertyName)) {
									return PsiTreeUtil.getParentOfType(property, JSGraphQLEndpointFieldDefinition.class);
								}
							}
						}
					}
				}
			}
		}
	}
	return null;
}
 

public static Map<Language, InlineHandler.Inliner> initializeInliners(PsiElement element,
                                                                      InlineHandler.Settings settings,
                                                                      Collection<? extends PsiReference> allReferences) {
  final Map<Language, InlineHandler.Inliner> inliners = new HashMap<Language, InlineHandler.Inliner>();
  for (PsiReference ref : allReferences) {
    if (ref == null) {
      LOG.error("element: " + element.getClass()+ ", allReferences contains null!");
      continue;
    }
    PsiElement refElement = ref.getElement();
    LOG.assertTrue(refElement != null, ref.getClass().getName());

    final Language language = refElement.getLanguage();
    if (inliners.containsKey(language)) continue;

    final List<InlineHandler> handlers = InlineHandlers.getInlineHandlers(language);
    for (InlineHandler handler : handlers) {
      InlineHandler.Inliner inliner = handler.createInliner(element, settings);
      if (inliner != null) {
        inliners.put(language, inliner);
        break;
      }
    }
  }
  return inliners;
}
 

@NotNull
@Override
public PsiReference[] getReferences() {
	SQFFile sqfFile = (SQFFile) getContainingFile();
	if (sqfFile == null) {
		return PsiReference.EMPTY_ARRAY;
	}
	List<SQFVariable> vars = new ArrayList<>();
	PsiUtil.traverseBreadthFirstSearch(sqfFile.getNode(), astNode -> {
		PsiElement nodeAsElement = astNode.getPsi();
		if (nodeAsElement instanceof SQFVariable) {
			SQFVariable var = (SQFVariable) nodeAsElement;
			if (var.isLocal()) {
				return false;
			}
			if (SQFVariableName.nameEquals(var.getVarName(), getVarName())) {
				vars.add(var);
			}
		}
		return false;
	});
	if (vars.isEmpty()) {
		return PsiReference.EMPTY_ARRAY;
	}
	return new PsiReference[]{new SQFVariableReference.IdentifierReference(this, vars)};
}
 

@Nullable
@Override
public PsiReference[] getPropertyReferences(AnnotationPropertyParameter parameter, PhpAnnotationReferenceProviderParameter phpAnnotationReferenceProviderParameter) {
    if(!isSupported(parameter)) {
        return new PsiReference[0];
    }

    String propertyName = parameter.getPropertyName();

    if("admin_permission".equalsIgnoreCase(propertyName)) {
        String contents = getContents(parameter.getElement());
        if(StringUtils.isBlank(contents)) {
            return new PsiReference[0];
        }

        return new PsiReference[] {new ContentEntityTypeAnnotation.MyPermissionPsiPolyVariantReferenceBase(parameter.getElement(), contents)};
    }

    return new PsiReference[0];
}
 

@Override
public PsiReference[] getReferences() {
  PsiElement element = getNode().getPsi();
  String maybeEmbeddedExpression = this.getText();
  if (!maybeEmbeddedExpression.startsWith("\"")) {
    PsiReference singleReference = getReference();
    return singleReference == null
        ? PsiReference.EMPTY_ARRAY
        : new PsiReference[]{singleReference};
  }

  Matcher identifierMatcher = IDENTIFIER_PATTERN.matcher(maybeEmbeddedExpression);
  List<PsiReference> variableReferenceList = new ArrayList<>();
  while (identifierMatcher.find()) {
    variableReferenceList.add(
        new VariableDefinitionReference(
            element,
            maybeEmbeddedExpression.substring(
                identifierMatcher.start() + 1, identifierMatcher.end()),
            new TextRange(
                element.getTextRange().getStartOffset() + identifierMatcher.start(),
                element.getTextRange().getStartOffset() + identifierMatcher.end()),
            new TextRange(identifierMatcher.start(), identifierMatcher.end())));
  }
  return variableReferenceList.toArray(new PsiReference[variableReferenceList.size()]);
}
 

@Override
public boolean processTextOccurrence(@Nonnull PsiElement element, int offsetInElement, @Nonnull final Processor<? super PsiReference> consumer) {
  if (!myTarget.isValid()) {
    return false;
  }

  final List<PsiReference> references = ourReferenceService.getReferences(element, new PsiReferenceService.Hints(myTarget, offsetInElement));
  //noinspection ForLoopReplaceableByForEach
  for (int i = 0; i < references.size(); i++) {
    PsiReference ref = references.get(i);
    ProgressManager.checkCanceled();
    if (ReferenceRange.containsOffsetInElement(ref, offsetInElement) && ref.isReferenceTo(myTarget) && !consumer.process(ref)) {
      return false;
    }
  }
  return true;
}
 

@Nullable
private PsiElement resolveRefAtCaret() {
	PsiElement elementAtCaret = myFixture.getFile().findElementAt(myFixture.getCaretOffset());

	if (elementAtCaret != null) {
		PsiReference ref = elementAtCaret.getReference();

		if (ref != null) {
			return ref.resolve();
		} else {
			fail("No reference at caret");
		}
	} else {
		fail("No element at caret");
	}

	return null;
}
 

@Override
default CypherType getType() {
    return Optional.ofNullable(getReferences())
            .filter(reference -> reference.length > 0)
            .map(reference -> reference[0])
            .map(PsiReference::resolve)
            .map(PsiElement::getParent)
            .map(node -> {
                if (node instanceof CypherNodePattern) {
                    return NODE;
                } else if (node instanceof CypherPatternPart) {
                    return PATH;
                } else if (node instanceof CypherRelationshipDetail) {
                    return resolveRelationshipType((CypherRelationshipDetail) node);
                }

                return null;
            })
            .orElse(ANY);
}
 

public void test() throws Throwable {
  doParseTest("SimpleParse");
  String docContent = myFixture.getEditor().getDocument().getCharsSequence().toString();
  String marker = "warn";

  PsiReference psiReference = myFixture.getFile().findReferenceAt(docContent.indexOf(marker) + marker.length());
  assertNotNull(psiReference);
  assertTrue(!(psiReference instanceof PsiMultiReference));

  marker = "operator ==";
  int offset = docContent.indexOf(marker) + marker.length() - 1;
  psiReference = myFixture.getFile().findReferenceAt(offset);
  assertNotNull(psiReference);
  assertTrue(!(psiReference instanceof PsiMultiReference));

  PsiElement psiElement = TargetElementUtil.getInstance().findTargetElement(myFixture.getEditor(), TargetElementUtil.REFERENCED_ELEMENT_ACCEPTED |
    TargetElementUtil.ELEMENT_NAME_ACCEPTED, offset);

  assertNotNull(psiElement);

  marker = "operator=";
  offset = docContent.indexOf(marker) + marker.length() - 1;
  psiReference = myFixture.getFile().findReferenceAt(offset);
  assertNotNull(psiReference);
  assertTrue(!(psiReference instanceof PsiMultiReference));
  psiElement = TargetElementUtil.getInstance().findTargetElement(myFixture.getEditor(), TargetElementUtil.REFERENCED_ELEMENT_ACCEPTED |
    TargetElementUtil.ELEMENT_NAME_ACCEPTED, offset);
  assertNotNull(psiElement);
}
 

public void testReference6()
{
    myFixture.configureByFile("public/packages/filePackagesResolveTest.js");
    PsiReference reference;

    reference = getReferenceForHumanPosition(7, 35);
    assertReference(reference, "'packageWithMainNotExists'", null);
}
 

private void checkReference(PsiElement element) {
    PsiReference ref = element.getReference();
    if (ref == null || ref.isSoft()) {
        return;
    }
    if (ref.resolve() == null) {
        String message = message("error.unresolved.reference");
        markError(element.getNode(), null, message);
    }
}
 

/**
 * TODO
 * Can only make this test work if findDefinitionNode returns the type declaration as well
 */
public void ignoreTestGoToSymbolFunction_RecordsType(){
    myFixture.configureByFile(getTestName(false)+".hs");
    PsiFile file = myFixture.getFile();
    String textOfFile = file.getText();
    int expectedStartOffset= textOfFile.indexOf("data Pool") + 5;
    PsiElement psiElement = file
            .findElementAt(myFixture.getCaretOffset()).getParent();
    HaskellConid conId = (HaskellConid) psiElement;
    PsiReference reference = conId.getReference();
    HaskellConid referencedElement = (HaskellConid)reference.resolve();
    assertNotSame(psiElement, referencedElement);
    assertEquals(expectedStartOffset,referencedElement.getTextRange().getStartOffset());
}
 

/**
 * @return Stream of resolved elements from the given element or an empty stream if nothing found.
 */
static Stream<PsiElement> resolve(PsiElement sourceElement) {
  return Optional.of(sourceElement)
      .filter(PsiIdentifier.class::isInstance)
      .map(element -> PsiTreeUtil.getParentOfType(element, PsiJavaCodeReferenceElement.class))
      .map(PsiElement::getReferences)
      .map(
          psiReferences ->
              Stream.of(psiReferences).map(PsiReference::resolve).filter(Objects::nonNull))
      .orElse(Stream.empty());
}
 

@Override
public PsiReference getReference() {
    final Ref<PsiReference> reference = new Ref<>();
    final GraphQLDirectiveLocationPsiElement psiElement = this;
    final String locationName = psiElement.getText();
    GraphQLPsiSearchHelper.getService(getProject()).getBuiltInSchema().accept(new PsiRecursiveElementVisitor() {
        @Override
        public void visitElement(PsiElement element) {
            if(element instanceof GraphQLEnumValue && element.getText().equals(locationName)) {
                final GraphQLIdentifier referencedEnumValue = ((GraphQLEnumValue) element).getNameIdentifier();
                reference.set(new PsiReferenceBase<PsiElement>(psiElement, new TextRange(0, psiElement.getTextLength())) {
                    @Nullable
                    @Override
                    public PsiElement resolve() {
                        return referencedEnumValue;
                    }

                    @NotNull
                    @Override
                    public Object[] getVariants() {
                        return PsiReference.EMPTY_ARRAY;
                    }
                });
                return; // done visiting
            }
            super.visitElement(element);
        }
    });
    return reference.get();
}
 

public void testReference2()
{
    myFixture.configureByFile("public/blocks/fileForReferenceTestWithExclamationMark.js");
    PsiReference reference;

    // 1
    reference = getReferenceForHumanPosition(3, 42);
    assertReference(reference, "'moduleTwo!moduleOne'", "childBlock.js");
}
 

@Test
@Ignore //broken atm
public void _testEvalRenameInlined() throws Exception {
    doRename(new Runnable() {
        @Override
        public void run() {
            PsiReference psiReference = myFixture.getFile().findReferenceAt(myFixture.getEditor().getCaretModel().getOffset());
            Assert.assertTrue(psiReference.resolve() instanceof BashVarDef);

            myFixture.renameElementAtCaret("a_renamed");
        }
    }, "source.bash");
}
 

@Override
public void annotate(@NotNull PsiElement psiElement, @NotNull AnnotationHolder annotationHolder) {
    if (!TYPO3CMSProjectSettings.getInstance(psiElement.getProject()).pluginEnabled) {
        return;
    }

    if (!TYPO3CMSProjectSettings.getInstance(psiElement.getProject()).routeAnnotatorEnabled) {
        return;
    }

    if (!(psiElement instanceof StringLiteralExpression)) {
        return;
    }

    StringLiteralExpression literalExpression = (StringLiteralExpression) psiElement;
    String value = literalExpression.getContents();

    if (value.isEmpty()) {
        return;
    }

    for (PsiReference psiReference : literalExpression.getReferences()) {
        if (psiReference instanceof RouteReference) {
            annotateRoute(psiElement, annotationHolder, value);
        }
    }
}
 

private void processElements(final ReferencesSearch.SearchParameters searchParameters, final Processor<? super PsiReference> processor) {
    ApplicationManager.getApplication().runReadAction(() -> {
        StepCollector collector = helper.getStepCollector(searchParameters.getElementToSearch());
        collector.collect();
        final List<PsiElement> elements = helper.getPsiElements(collector, searchParameters.getElementToSearch());
        for (PsiElement element : elements)
            processor.process(element.getReference());
    });
}
 

public PsiClass resolveClassReference(@NotNull PsiReference reference) {
    final PsiElement resolveElement = reference.resolve();

    if (resolveElement instanceof PsiClass) {
        return (PsiClass) resolveElement;
    } else if (resolveElement instanceof PsiField) {
        final PsiType psiType = PsiUtil.getTypeByPsiElement(resolveElement);
        if (psiType != null) {
            return ((PsiClassReferenceType) psiType).resolve();
        }
    }

    return null;
}
 

@Test
public void testValidScope() throws Exception {
    PsiReference variableReference = configure();
    PsiFile included = addFile("included.bash");

    PsiElement varDef = variableReference.resolve();
    Assert.assertNotNull("The reference did not resolve", varDef);
    Assert.assertTrue("var def must resolve to the definition in included.bash", included.equals(varDef.getContainingFile()));

    Assert.assertTrue("The definition and usage scope must be valid", BashVarUtils.isInDefinedScope(variableReference.getElement(), (BashVarDef) varDef));
}
 

/**
 * Return reference or empty array
 *
 * @param element PsiElement
 * @param context ProcessingContext
 * @return PsiReference[]
 */
@NotNull
@Override
public PsiReference[] getReferencesByElement(@NotNull PsiElement element, @NotNull final ProcessingContext context) {
    project = element.getProject();
    String elname = element.getClass().getName();
    //properties = PropertiesComponent.getInstance(project);
    /*boolean ProviderType2 = YiiRefsHelper.isYiiApplication(element);
    if (ProviderType2) {
        ProviderType2 = ProviderType2;
    }    */
    if (elname.endsWith("StringLiteralExpressionImpl")) {

        try {
            PsiFile file = element.getContainingFile();
            VirtualFile vfile = file.getVirtualFile();
            if (vfile != null) {
                String path = vfile.getPath();
                String basePath = project.getBasePath();
                if (basePath != null) {
                    projectPath = basePath.replace("\\", "/");
                    int ProviderType = YiiRefsHelper.getYiiObjectType(path, element);
                    switch (ProviderType) {
                        case YiiRefsHelper.YII_TYPE_AR_RELATION:
                            return ARRelationReferenceProvider.getReference(path, element);
                        case YiiRefsHelper.YII_TYPE_CACTION_TO_VIEW_RENDER:
                            return CActionRenderViewReferenceProvider.getReference(path, element);
                        case YiiRefsHelper.YII_TYPE_WIDGET_VIEW_RENDER:
                            return WidgetRenderViewReferenceProvider.getReference(path, element);
                        case YiiRefsHelper.YII_TYPE_CONTROLLER_ACTIONS_CACTION:
                            return ControlleActionsClassReferenceProvider.getReference(path, element);
                    }
                }
            }
        } catch (Exception e) {
            //System.err.println("error" + e.getMessage());
        }
    }
    return PsiReference.EMPTY_ARRAY;
}
 

public static TranslationReference getTranslationReference(@NotNull PsiElement element) {

        for (PsiReference reference : element.getReferences()) {
            if (reference instanceof TranslationReference) {
                return (TranslationReference) reference;
            }
        }

        return null;
    }
 

public void testImportedImportedCustomOptionReference() {
    myFixture.configureByFiles(
            "reference/options/custom/SimpleExtensionField.proto",
            "reference/options/custom/ImportedExtension.proto"
    );
    PsiReference reference = myFixture.getReferenceAtCaretPositionWithAssertion(
            "reference/options/custom/ImportedImportedExtension.proto"
    );
    PsiElement target = reference.resolve();
    Assert.assertNotNull(target);
    Assert.assertTrue(target instanceof FieldNode);
    FieldNode field = (FieldNode) target;
    Assert.assertEquals("bar", field.getFieldName());
    Assert.assertTrue(field.getParent() instanceof ExtendEntryNode);
}
 

@Nonnull
@Override
public Collection<PsiReference> findReferences(PsiElement element) {
  if (!getSearchForReferences(element)) {
    return Collections.emptyList();
  }
  return super.findReferences(element);
}
 

public void testGoToSymbolFunction_CanReferenceOtherFunction(){
    myFixture.configureByFile(getTestName(false)+".hs");
    PsiFile file = myFixture.getFile();
    String textOfFile = file.getText();
    int expectedStartOffset= textOfFile.indexOf("test2 ::");
    PsiElement psiElement = file
            .findElementAt(myFixture.getCaretOffset()).getParent();
    HaskellVarid varId = (HaskellVarid) psiElement;
    PsiReference reference = varId.getReference();
    HaskellVarid referencedElement = (HaskellVarid)reference.resolve();
    assertNotSame(psiElement, referencedElement);
    assertEquals(expectedStartOffset,referencedElement.getTextRange().getStartOffset());
}
 

/**
 * Single resolve doesnt work if we have non unique class names in project context,
 * so try a multiResolve
 */
@Nullable
public static Method[] getMultiResolvedMethod(PsiReference psiReference) {

    // class be unique in normal case, so try this first
    PsiElement resolvedReference = psiReference.resolve();
    if (resolvedReference instanceof Method) {
        return new Method[] { (Method) resolvedReference };
    }

    // try multiResolve if class exists twice in project
    if(psiReference instanceof PsiPolyVariantReference) {
        Collection<Method> methods = new HashSet<>();
        for(ResolveResult resolveResult : ((PsiPolyVariantReference) psiReference).multiResolve(false)) {
            PsiElement element = resolveResult.getElement();
            if(element instanceof Method) {
                methods.add((Method) element);
            }
        }

        if(methods.size() > 0) {
            return methods.toArray(new Method[methods.size()]);
        }

    }

    return null;
}