[PATCH] D158346: [clang-tidy] [readability-container-size-empty] improved check to detect missing usage of .empty() on string_literals Fixes #64547

[Félix-Antoine Constantin via Phabricator via cfe-commits]

felix642 created this revision.
Herald added subscribers: PiotrZSL, carlosgalvezp, xazax.hun.
Herald added a reviewer: njames93.
Herald added a project: All.
felix642 requested review of this revision.
Herald added a project: clang-tools-extra.
Herald added a subscriber: cfe-commits.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158346

Files:
  clang-tools-extra/clang-tidy/readability/ContainerSizeEmptyCheck.cpp
  clang-tools-extra/test/clang-tidy/checkers/readability/container-size-empty.cpp


Index: clang-tools-extra/test/clang-tidy/checkers/readability/container-size-empty.cpp
===================================================================
--- clang-tools-extra/test/clang-tidy/checkers/readability/container-size-empty.cpp
+++ clang-tools-extra/test/clang-tidy/checkers/readability/container-size-empty.cpp
@@ -22,6 +22,10 @@
 };
 }
 
+namespace string_literals{
+string operator""s(const char *, size_t);
+}
+
 }
 
 template <typename T>
@@ -770,3 +774,17 @@
 bool testIgnoredDummyType(const IgnoredDummyType& value) {
   return value == IgnoredDummyType();
 }
+
+bool testStringLiterals(const std::string& s)
+{
+  using namespace std::string_literals;
+  return s == ""s;
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: the 'empty' method should be used
+  // CHECK-FIXES: {{^  }}return s.empty()
+}
+
+bool testNotEmptyStringLiterals(const std::string& s)
+{
+  using namespace std::string_literals;
+  return s == "foo"s;
+}
\ No newline at end of file
Index: clang-tools-extra/clang-tidy/readability/ContainerSizeEmptyCheck.cpp
===================================================================
--- clang-tools-extra/clang-tidy/readability/ContainerSizeEmptyCheck.cpp
+++ clang-tools-extra/clang-tidy/readability/ContainerSizeEmptyCheck.cpp
@@ -166,9 +166,11 @@
       this);
 
   // Comparison to empty string or empty constructor.
-  const auto WrongComparend = anyOf(
-      stringLiteral(hasSize(0)), cxxConstructExpr(isDefaultConstruction()),
-      cxxUnresolvedConstructExpr(argumentCountIs(0)));
+  const auto WrongComparend =
+      anyOf(stringLiteral(hasSize(0)),
+            userDefinedLiteral(hasDescendant(stringLiteral(hasSize(0)))),
+            cxxConstructExpr(isDefaultConstruction()),
+            cxxUnresolvedConstructExpr(argumentCountIs(0)));
   // Match the object being compared.
   const auto STLArg =
       anyOf(unaryOperator(


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