[clang] [clang-format] js handle anonymous classes (PR #106242)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-format

Author: Krasimir Georgiev (krasimirgg)

<details>
<summary>Changes</summary>

Addresses a regression in JavaScript when formatting anonymous classes.

---
Full diff: https://github.com/llvm/llvm-project/pull/106242.diff


2 Files Affected:

- (modified) clang/lib/Format/UnwrappedLineParser.cpp (+5-1) 
- (modified) clang/unittests/Format/FormatTestJS.cpp (+9) 


``````````diff
diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index 5f1a88d4bcd729..7591eaeae461a7 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -3992,6 +3992,9 @@ void UnwrappedLineParser::parseRecord(bool ParseAsExpr) {
   auto IsNonMacroIdentifier = [](const FormatToken *Tok) {
     return Tok->is(tok::identifier) && Tok->TokenText != Tok->TokenText.upper();
   };
+  // JavaScript/TypeScript supports anonymous classes like:
+  // a = class extends foo { }
+  bool JSPastExtendsOrImplements = false;
   // The actual identifier can be a nested name specifier, and in macros
   // it is often token-pasted.
   // An [[attribute]] can be before the identifier.
@@ -4002,6 +4005,7 @@ void UnwrappedLineParser::parseRecord(bool ParseAsExpr) {
           FormatTok->isOneOf(tok::period, tok::comma))) {
     if (Style.isJavaScript() &&
         FormatTok->isOneOf(Keywords.kw_extends, Keywords.kw_implements)) {
+      JSPastExtendsOrImplements = true;
       // JavaScript/TypeScript supports inline object types in
       // extends/implements positions:
       //     class Foo implements {bar: number} { }
@@ -4027,7 +4031,7 @@ void UnwrappedLineParser::parseRecord(bool ParseAsExpr) {
     case tok::coloncolon:
       break;
     default:
-      if (!ClassName && Previous->is(tok::identifier) &&
+      if (!JSPastExtendsOrImplements && !ClassName && Previous->is(tok::identifier) &&
           Previous->isNot(TT_AttributeMacro)) {
         ClassName = Previous;
       }
diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
index b910ce620de7a9..734c1590c41ddb 100644
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -579,6 +579,15 @@ TEST_F(FormatTestJS, GoogScopes) {
                "});");
 }
 
+TEST_F(FormatTestJS, GoogAnonymousClass) {
+  verifyFormat("a = class extends goog.structs.a {\n"
+               "  a() {\n"
+               "    return 0;\n"
+               "  }\n"
+               "};");
+}
+
+
 TEST_F(FormatTestJS, IIFEs) {
   // Internal calling parens; no semi.
   verifyFormat("(function() {\n"

``````````

</details>


https://github.com/llvm/llvm-project/pull/106242