org.eclipse.lsp4j.SignatureHelp#getSignatures ( )源码实例Demo

@Test
void testSignatureHelpOnMethod() throws Exception {
	Path filePath = srcRoot.resolve("Completion.groovy");
	String uri = filePath.toUri().toString();
	StringBuilder contents = new StringBuilder();
	contents.append("class SignatureHelp {\n");
	contents.append("  public SignatureHelp() {\n");
	contents.append("    method(\n");
	contents.append("  }\n");
	contents.append("  public void method(int param0) {}\n");
	contents.append("}");
	TextDocumentItem textDocumentItem = new TextDocumentItem(uri, LANGUAGE_GROOVY, 1, contents.toString());
	services.didOpen(new DidOpenTextDocumentParams(textDocumentItem));
	TextDocumentIdentifier textDocument = new TextDocumentIdentifier(uri);
	Position position = new Position(2, 11);
	SignatureHelp signatureHelp = services.signatureHelp(new TextDocumentPositionParams(textDocument, position))
			.get();
	List<SignatureInformation> signatures = signatureHelp.getSignatures();
	Assertions.assertEquals(1, signatures.size());
	SignatureInformation signature = signatures.get(0);
	Assertions.assertEquals("public void method(int param0)", signature.getLabel());
	List<ParameterInformation> params = signature.getParameters();
	Assertions.assertEquals(1, params.size());
	ParameterInformation param0 = params.get(0);
	Assertions.assertEquals("int param0", param0.getLabel().get());
	Assertions.assertEquals((int) 0, (int) signatureHelp.getActiveSignature());
	Assertions.assertEquals((int) 0, (int) signatureHelp.getActiveParameter());
}
 

@Test
void testSignatureHelpOnMethodWithMultipleParameters() throws Exception {
	Path filePath = srcRoot.resolve("Completion.groovy");
	String uri = filePath.toUri().toString();
	StringBuilder contents = new StringBuilder();
	contents.append("class SignatureHelp {\n");
	contents.append("  public SignatureHelp() {\n");
	contents.append("    method(\n");
	contents.append("  }\n");
	contents.append("  public void method(int param0, String param1) {}\n");
	contents.append("}");
	TextDocumentItem textDocumentItem = new TextDocumentItem(uri, LANGUAGE_GROOVY, 1, contents.toString());
	services.didOpen(new DidOpenTextDocumentParams(textDocumentItem));
	TextDocumentIdentifier textDocument = new TextDocumentIdentifier(uri);
	Position position = new Position(2, 11);
	SignatureHelp signatureHelp = services.signatureHelp(new TextDocumentPositionParams(textDocument, position))
			.get();
	List<SignatureInformation> signatures = signatureHelp.getSignatures();
	Assertions.assertEquals(1, signatures.size());
	SignatureInformation signature = signatures.get(0);
	Assertions.assertEquals("public void method(int param0, String param1)", signature.getLabel());
	List<ParameterInformation> params = signature.getParameters();
	Assertions.assertEquals(2, params.size());
	ParameterInformation param0 = params.get(0);
	Assertions.assertEquals("int param0", param0.getLabel().get());
	ParameterInformation param1 = params.get(1);
	Assertions.assertEquals("String param1", param1.getLabel().get());
	Assertions.assertEquals((int) 0, (int) signatureHelp.getActiveSignature());
	Assertions.assertEquals((int) 0, (int) signatureHelp.getActiveParameter());
}
 

@Test
void testSignatureHelpOnMethodWithActiveParameter() throws Exception {
	Path filePath = srcRoot.resolve("Completion.groovy");
	String uri = filePath.toUri().toString();
	StringBuilder contents = new StringBuilder();
	contents.append("class SignatureHelp {\n");
	contents.append("  public SignatureHelp() {\n");
	contents.append("    method(123,\n");
	contents.append("  }\n");
	contents.append("  public void method(int param0, String param1) {}\n");
	contents.append("}");
	TextDocumentItem textDocumentItem = new TextDocumentItem(uri, LANGUAGE_GROOVY, 1, contents.toString());
	services.didOpen(new DidOpenTextDocumentParams(textDocumentItem));
	TextDocumentIdentifier textDocument = new TextDocumentIdentifier(uri);
	Position position = new Position(2, 15);
	SignatureHelp signatureHelp = services.signatureHelp(new TextDocumentPositionParams(textDocument, position))
			.get();
	List<SignatureInformation> signatures = signatureHelp.getSignatures();
	Assertions.assertEquals(1, signatures.size());
	SignatureInformation signature = signatures.get(0);
	Assertions.assertEquals("public void method(int param0, String param1)", signature.getLabel());
	List<ParameterInformation> params = signature.getParameters();
	Assertions.assertEquals(2, params.size());
	ParameterInformation param0 = params.get(0);
	Assertions.assertEquals("int param0", param0.getLabel().get());
	ParameterInformation param1 = params.get(1);
	Assertions.assertEquals("String param1", param1.getLabel().get());
	Assertions.assertEquals((int) 0, (int) signatureHelp.getActiveSignature());
	Assertions.assertEquals((int) 1, (int) signatureHelp.getActiveParameter());
}
 

private boolean isSameParameters(IMethod m, SignatureHelp help, SignatureHelpRequestor collector, IJavaProject javaProject) throws JavaModelException {
	if (m == null || help == null || javaProject == null) {
		return false;
	}
	List<SignatureInformation> infos = help.getSignatures();
	for (int i = 0; i < infos.size(); i++) {
		CompletionProposal proposal = collector.getInfoProposals().get(infos.get(i));
		IMethod method = JDTUtils.resolveMethod(proposal, javaProject);
		if (isSameParameters(method, m)) {
			return true;
		}
	}
	return false;
}