[PATCH] D69238: Fix clang-tidy readability-redundant-string-init for c++17/c++2a

[Conrad Poelman via Phabricator via cfe-commits]

poelmanc updated this revision to Diff 228556.
poelmanc edited the summary of this revision.

Repository:
  rCTE Clang Tools Extra

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D69238/new/

https://reviews.llvm.org/D69238

Files:
  clang-tools-extra/clang-tidy/readability/RedundantStringInitCheck.cpp
  clang-tools-extra/test/clang-tidy/checkers/readability-redundant-string-init-msvc.cpp
  clang-tools-extra/test/clang-tidy/checkers/readability-redundant-string-init.cpp


Index: clang-tools-extra/test/clang-tidy/checkers/readability-redundant-string-init.cpp
===================================================================
--- clang-tools-extra/test/clang-tidy/checkers/readability-redundant-string-init.cpp
+++ clang-tools-extra/test/clang-tidy/checkers/readability-redundant-string-init.cpp
@@ -1,5 +1,4 @@
-// RUN: %check_clang_tidy -std=c++11,c++14 %s readability-redundant-string-init %t
-// FIXME: Fix the checker to work in C++17 mode.
+// RUN: %check_clang_tidy %s readability-redundant-string-init %t
 
 namespace std {
 template <typename T>
@@ -131,6 +130,11 @@
   // CHECK-FIXES: std::string a, b, c;
 
   std::string d = "u", e = "u", f = "u";
+
+  std::string g = "u", h = "", i = "uuu", j = "", k;
+  // CHECK-MESSAGES: [[@LINE-1]]:24: warning: redundant string initialization
+  // CHECK-MESSAGES: [[@LINE-2]]:43: warning: redundant string initialization
+  // CHECK-FIXES: std::string g = "u", h, i = "uuu", j, k;
 }
 
 // These cases should not generate warnings.
Index: clang-tools-extra/test/clang-tidy/checkers/readability-redundant-string-init-msvc.cpp
===================================================================
--- clang-tools-extra/test/clang-tidy/checkers/readability-redundant-string-init-msvc.cpp
+++ clang-tools-extra/test/clang-tidy/checkers/readability-redundant-string-init-msvc.cpp
@@ -1,5 +1,4 @@
-// RUN: %check_clang_tidy -std=c++11,c++14 %s readability-redundant-string-init %t
-// FIXME: Fix the checker to work in C++17 mode.
+// RUN: %check_clang_tidy %s readability-redundant-string-init %t
 
 namespace std {
 template <typename T>
Index: clang-tools-extra/clang-tidy/readability/RedundantStringInitCheck.cpp
===================================================================
--- clang-tools-extra/clang-tidy/readability/RedundantStringInitCheck.cpp
+++ clang-tools-extra/clang-tidy/readability/RedundantStringInitCheck.cpp
@@ -46,23 +46,23 @@
   //     string bar("");
   Finder->addMatcher(
       namedDecl(
-          varDecl(hasType(hasUnqualifiedDesugaredType(recordType(
-                      hasDeclaration(cxxRecordDecl(hasName("basic_string")))))),
-                  hasInitializer(expr(ignoringImplicit(anyOf(
-                                          EmptyStringCtorExpr,
-                                          EmptyStringCtorExprWithTemporaries)))
-                                     .bind("expr"))),
-          unless(parmVarDecl()))
-          .bind("decl"),
+          varDecl(
+              hasType(hasUnqualifiedDesugaredType(recordType(
+                  hasDeclaration(cxxRecordDecl(hasName("basic_string")))))),
+              hasInitializer(expr(ignoringImplicit(anyOf(
+                  EmptyStringCtorExpr, EmptyStringCtorExprWithTemporaries)))))
+              .bind("vardecl"),
+          unless(parmVarDecl())),
       this);
 }
 
 void RedundantStringInitCheck::check(const MatchFinder::MatchResult &Result) {
-  const auto *CtorExpr = Result.Nodes.getNodeAs<Expr>("expr");
-  const auto *Decl = Result.Nodes.getNodeAs<NamedDecl>("decl");
-  diag(CtorExpr->getExprLoc(), "redundant string initialization")
-      << FixItHint::CreateReplacement(CtorExpr->getSourceRange(),
-                                      Decl->getName());
+  const auto *VDecl = Result.Nodes.getNodeAs<VarDecl>("vardecl");
+  // VarDecl's getSourceRange() spans 'string foo = ""' or 'string bar("")'.
+  // So start at getLocation() to span just 'foo = ""' or 'bar("")'.
+  SourceRange ReplaceRange(VDecl->getLocation(), VDecl->getEndLoc());
+  diag(VDecl->getLocation(), "redundant string initialization")
+      << FixItHint::CreateReplacement(ReplaceRange, VDecl->getName());
 }
 
 } // namespace readability


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