clang-format: [Java] Support anonymous classes after = and return.

Before:
  A a = new A(){public String toString(){return "NotReallyA";
  }
  }
  ;

After:
  A a = return new A() {
    public String toString() {
      return "NotReallyA";
    }
  };

This fixes llvm.org/PR22878.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@232042 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/UnwrappedLineParser.cpp

@@ -868,6 +868,9 @@ void UnwrappedLineParser::parseStructuralElement() {
     case tok::l_square:
       parseSquare();
       break;
+    case tok::kw_new:
+      parseNew();
+      break;
     default:
       nextToken();
       break;
@@ -1274,6 +1277,31 @@ void UnwrappedLineParser::parseNamespace() {
   // FIXME: Add error handling.
 }
 
+void UnwrappedLineParser::parseNew() {
+  assert(FormatTok->is(tok::kw_new) && "'new' expected");
+  nextToken();
+  if (Style.Language != FormatStyle::LK_Java)
+    return;
+
+  // In Java, we can parse everything up to the parens, which aren't optional.
+  do {
+    // There should not be a ;, { or } before the new's open paren.
+    if (FormatTok->isOneOf(tok::semi, tok::l_brace, tok::r_brace))
+      return;
+
+    // Consume the parens.
+    if (FormatTok->is(tok::l_paren)) {
+      parseParens();
+
+      // If there is a class body of an anonymous class, consume that as child.
+      if (FormatTok->is(tok::l_brace))
+        parseChildBlock();
+      return;
+    }
+    nextToken();
+  } while (!eof());
+}
+
 void UnwrappedLineParser::parseForOrWhileLoop() {
   assert((FormatTok->Tok.is(tok::kw_for) || FormatTok->Tok.is(tok::kw_while) ||
           FormatTok->IsForEachMacro) &&

lib/Format/UnwrappedLineParser.h

@@ -95,6 +95,7 @@ private:
   void parseCaseLabel();
   void parseSwitch();
   void parseNamespace();
+  void parseNew();
   void parseAccessSpecifier();
   void parseEnum();
   void parseJavaEnumBody();

unittests/Format/FormatTestJava.cpp

@@ -153,6 +153,19 @@ TEST_F(FormatTestJava, ClassDeclarations) {
                "}");
 }
 
+TEST_F(FormatTestJava, AnonymousClasses) {
+  verifyFormat("return new A() {\n"
+               "  public String toString() {\n"
+               "    return \"NotReallyA\";\n"
+               "  }\n"
+               "};");
+  verifyFormat("A a = new A() {\n"
+               "  public String toString() {\n"
+               "    return \"NotReallyA\";\n"
+               "  }\n"
+               "};");
+}
+
 TEST_F(FormatTestJava, EnumDeclarations) {
   verifyFormat("enum SomeThing { ABC, CDE }");
   verifyFormat("enum SomeThing {\n"