[PATCH] D118446: clang-format: [JS] sort import aliases. Users can define aliases for long symbols using import aliases:

[Martin Probst via Phabricator via cfe-commits]

mprobst created this revision.
mprobst added a reviewer: jankuehle.
Herald added a subscriber: jeroen.dobbelaere.
mprobst requested review of this revision.
Herald added a project: clang.

  import X = A.B.C;

Previously, these were unhandled and would terminate import sorting.
With this change, aliases sort as their own group, coming last after all
other imports.

Aliases are not sorted within their group, as they may reference each
other, so order is significant.

This reverts commit f750c3d95a0c8bf1d21380ae753fce12010a7561 <https://reviews.llvm.org/rGf750c3d95a0c8bf1d21380ae753fce12010a7561>. It fixes
the msan issue by not parsing past the end of the line when handling
import aliases.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118446

Files:
  clang/lib/Format/SortJavaScriptImports.cpp
  clang/unittests/Format/SortImportsTestJS.cpp


Index: clang/unittests/Format/SortImportsTestJS.cpp
===================================================================
--- clang/unittests/Format/SortImportsTestJS.cpp
+++ clang/unittests/Format/SortImportsTestJS.cpp
@@ -446,6 +446,25 @@
              "const x =   1;");
 }
 
+TEST_F(SortImportsTestJS, ImportEqAliases) {
+  verifySort("import {B} from 'bar';\n"
+             "import {A} from 'foo';\n"
+             "\n"
+             "import Z = A.C;\n"
+             "import Y = B.C.Z;\n"
+             "\n"
+             "export {Z};\n"
+             "\n"
+             "console.log(Z);\n",
+             "import {A} from 'foo';\n"
+             "import Z = A.C;\n"
+             "export {Z};\n"
+             "import {B} from 'bar';\n"
+             "import Y = B.C.Z;\n"
+             "\n"
+             "console.log(Z);\n");
+}
+
 } // end namespace
 } // end namespace format
 } // end namespace clang
Index: clang/lib/Format/SortJavaScriptImports.cpp
===================================================================
--- clang/lib/Format/SortJavaScriptImports.cpp
+++ clang/lib/Format/SortJavaScriptImports.cpp
@@ -78,6 +78,7 @@
     ABSOLUTE,        // from 'something'
     RELATIVE_PARENT, // from '../*'
     RELATIVE,        // from './*'
+    ALIAS,           // import X = A.B;
   };
   ReferenceCategory Category = ReferenceCategory::SIDE_EFFECT;
   // The URL imported, e.g. `import .. from 'url';`. Empty for `export {a, b};`.
@@ -105,10 +106,12 @@
     return LHS.IsExport < RHS.IsExport;
   if (LHS.Category != RHS.Category)
     return LHS.Category < RHS.Category;
-  if (LHS.Category == JsModuleReference::ReferenceCategory::SIDE_EFFECT)
-    // Side effect imports might be ordering sensitive. Consider them equal so
-    // that they maintain their relative order in the stable sort below.
-    // This retains transitivity because LHS.Category == RHS.Category here.
+  if (LHS.Category == JsModuleReference::ReferenceCategory::SIDE_EFFECT ||
+      LHS.Category == JsModuleReference::ReferenceCategory::ALIAS)
+    // Side effect imports and aliases might be ordering sensitive. Consider
+    // them equal so that they maintain their relative order in the stable sort
+    // below. This retains transitivity because LHS.Category == RHS.Category
+    // here.
     return false;
   // Empty URLs sort *last* (for export {...};).
   if (LHS.URL.empty() != RHS.URL.empty())
@@ -398,6 +401,8 @@
       JsModuleReference Reference;
       Reference.FormattingOff = FormattingOff;
       Reference.Range.setBegin(Start);
+      // References w/o a URL, e.g. export {A}, groups with RELATIVE.
+      Reference.Category = JsModuleReference::ReferenceCategory::RELATIVE;
       if (!parseModuleReference(Keywords, Reference)) {
         if (!FirstNonImportLine)
           FirstNonImportLine = Line; // if no comment before.
@@ -463,9 +468,6 @@
         Reference.Category = JsModuleReference::ReferenceCategory::RELATIVE;
       else
         Reference.Category = JsModuleReference::ReferenceCategory::ABSOLUTE;
-    } else {
-      // w/o URL groups with "empty".
-      Reference.Category = JsModuleReference::ReferenceCategory::RELATIVE;
     }
     return true;
   }
@@ -501,6 +503,20 @@
       nextToken();
       if (Current->is(Keywords.kw_from))
         return true;
+      // import X = A.B.C;
+      if (Current->is(tok::equal)) {
+        Reference.Category = JsModuleReference::ReferenceCategory::ALIAS;
+        nextToken();
+        while (Current->is(tok::identifier)) {
+          nextToken();
+          if (Current->is(tok::semi)) {
+            return true;
+          }
+          if (!Current->is(tok::period))
+            return false;
+          nextToken();
+        }
+      }
       if (Current->isNot(tok::comma))
         return false;
       nextToken(); // eat comma.


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