clang-format: [JS] prevent wraps before class members.

Summary: In JavaScript/TypeScript, class member definitions that use modifiers can be subject to Automatic Semicolon Insertion (ASI). For example, "class X { get \n foo }" defines a property called "get" and a property called "foo", both with no type annotation. This change prevents wrapping after the modifier keywords (visibility modifiers, static, get and set) to prevent accidental ASI.

Reviewers: djasper, bkramer

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D32531

llvm-svn: 301397

clang/lib/Format/FormatToken.h

@@ -617,10 +617,12 @@ struct AdditionalKeywords {
     kw_finally = &IdentTable.get("finally");
     kw_from = &IdentTable.get("from");
     kw_function = &IdentTable.get("function");
+    kw_get = &IdentTable.get("get");
     kw_import = &IdentTable.get("import");
     kw_is = &IdentTable.get("is");
     kw_let = &IdentTable.get("let");
     kw_module = &IdentTable.get("module");
+    kw_set = &IdentTable.get("set");
     kw_type = &IdentTable.get("type");
     kw_var = &IdentTable.get("var");
     kw_yield = &IdentTable.get("yield");
@@ -675,10 +677,12 @@ struct AdditionalKeywords {
   IdentifierInfo *kw_finally;
   IdentifierInfo *kw_from;
   IdentifierInfo *kw_function;
+  IdentifierInfo *kw_get;
   IdentifierInfo *kw_import;
   IdentifierInfo *kw_is;
   IdentifierInfo *kw_let;
   IdentifierInfo *kw_module;
+  IdentifierInfo *kw_set;
   IdentifierInfo *kw_type;
   IdentifierInfo *kw_var;
   IdentifierInfo *kw_yield;

clang/lib/Format/TokenAnnotator.cpp

@@ -2543,7 +2543,11 @@ bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
     if (NonComment &&
         NonComment->isOneOf(tok::kw_return, tok::kw_continue, tok::kw_break,
                             tok::kw_throw, Keywords.kw_interface,
-                            Keywords.kw_type))
+                            Keywords.kw_type, tok::kw_static, tok::kw_public,
+                            tok::kw_private, tok::kw_protected,
+                            Keywords.kw_abstract,
+                            Keywords.kw_get,
+                            Keywords.kw_set))
       return false; // Otherwise a semicolon is inserted.
     if (Left.is(TT_JsFatArrow) && Right.is(tok::l_brace))
       return false;

clang/unittests/Format/FormatTestJS.cpp

@@ -318,6 +318,25 @@ TEST_F(FormatTestJS, MethodsInObjectLiterals) {
                "};");
 }
 
+TEST_F(FormatTestJS, GettersSettersVisibilityKeywords) {
+  // Don't break after "protected"
+  verifyFormat("class X {\n"
+               "  protected get getter():\n"
+               "      number {\n"
+               "    return 1;\n"
+               "  }\n"
+               "}",
+               getGoogleJSStyleWithColumns(12));
+  // Don't break after "get"
+  verifyFormat("class X {\n"
+               "  protected get someReallyLongGetterName():\n"
+               "      number {\n"
+               "    return 1;\n"
+               "  }\n"
+               "}",
+               getGoogleJSStyleWithColumns(40));
+}
+
 TEST_F(FormatTestJS, SpacesInContainerLiterals) {
   verifyFormat("var arr = [1, 2, 3];");
   verifyFormat("f({a: 1, b: 2, c: 3});");