[Refactoring] Move LocalizeString to its own file

lib/Refactoring/LocalizeString.cpp

@@ -0,0 +1,54 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+#include "RefactoringActions.h"
+
+using namespace swift::refactoring;
+
+static Expr *findLocalizeTarget(ResolvedCursorInfoPtr CursorInfo) {
+  auto ExprStartInfo = dyn_cast<ResolvedExprStartCursorInfo>(CursorInfo);
+  if (!ExprStartInfo)
+    return nullptr;
+  struct StringLiteralFinder : public SourceEntityWalker {
+    SourceLoc StartLoc;
+    Expr *Target;
+    StringLiteralFinder(SourceLoc StartLoc)
+        : StartLoc(StartLoc), Target(nullptr) {}
+    bool walkToExprPre(Expr *E) override {
+      if (E->getStartLoc() != StartLoc)
+        return false;
+      if (E->getKind() == ExprKind::InterpolatedStringLiteral)
+        return false;
+      if (E->getKind() == ExprKind::StringLiteral) {
+        Target = E;
+        return false;
+      }
+      return true;
+    }
+  } Walker(ExprStartInfo->getTrailingExpr()->getStartLoc());
+  Walker.walk(ExprStartInfo->getTrailingExpr());
+  return Walker.Target;
+}
+
+bool RefactoringActionLocalizeString::isApplicable(ResolvedCursorInfoPtr Tok,
+                                                   DiagnosticEngine &Diag) {
+  return findLocalizeTarget(Tok);
+}
+
+bool RefactoringActionLocalizeString::performChange() {
+  Expr *Target = findLocalizeTarget(CursorInfo);
+  if (!Target)
+    return true;
+  EditConsumer.accept(SM, Target->getStartLoc(), "NSLocalizedString(");
+  EditConsumer.insertAfter(SM, Target->getEndLoc(), ", comment: \"\")");
+  return false;
+}