From eec01adde3ac789fe5e032ce34da3b2266830308 Mon Sep 17 00:00:00 2001
From: Alexander Kornienko <alexfh@google.com>
Date: Wed, 26 Apr 2017 16:39:11 +0000
Subject: [PATCH] [clang-tidy] Update IdentifierNamingCheck to remove extra
 leading/trailing underscores

Summary:
The goal of this change is to fix the following suboptimal replacements currently suggested by clang-tidy:
```
// with MemberPrefix == "_"
int __foo;  // accepted without complaint
```
```
// with MemberPrefix == "m_"
int _foo;
    ^~~~~~
    m__foo
```

I fixed this by
- updating `matchesStyle()` to reject names which have a leading underscore after a prefix has already been stripped, or a trailing underscore if a suffix has already been stripped;
- updating `fixupWithStyle()` to strip leading & trailing underscores before adding the user-defined prefix and suffix.

The replacements are now:
```
// MemberPrefix == "_"
int __foo;
    ^~~~~~
    _foo
```
```
// MemberPrefix == "m_"
int _foo;
    ^~~~~
    m_foo
```

Future improvements might elect to add .clang-tidy flags to improve what is being stripped. For instance, stripping `m_` could allow `m_foo` to be automatically replaced with `_foo`.

Reviewers: alexfh

Reviewed By: alexfh

Subscribers: cfe-commits

Patch by Jacob Bandes-Storch!

Differential Revision: https://reviews.llvm.org/D32333

llvm-svn: 301431
---
 .../clang-tidy/readability/IdentifierNamingCheck.cpp      | 15 +++++++++++----
 .../test/clang-tidy/readability-identifier-naming.cpp     |  3 +++
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp b/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp
index 3502a6f..175feea 100644
--- a/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp
+++ b/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp
@@ -262,6 +262,11 @@ static bool matchesStyle(StringRef Name,
   else
     Matches = false;
 
+  // Ensure the name doesn't have any extra underscores beyond those specified
+  // in the prefix and suffix.
+  if (Name.startswith("_") || Name.endswith("_"))
+    Matches = false;
+
   if (Style.Case && !Matchers[static_cast<size_t>(*Style.Case)].match(Name))
     Matches = false;
 
@@ -367,10 +372,12 @@ static std::string fixupWithCase(StringRef Name,
 static std::string
 fixupWithStyle(StringRef Name,
                const IdentifierNamingCheck::NamingStyle &Style) {
-  return Style.Prefix +
-         fixupWithCase(Name, Style.Case.getValueOr(
-                                 IdentifierNamingCheck::CaseType::CT_AnyCase)) +
-         Style.Suffix;
+  const std::string Fixed = fixupWithCase(
+      Name, Style.Case.getValueOr(IdentifierNamingCheck::CaseType::CT_AnyCase));
+  StringRef Mid = StringRef(Fixed).trim("_");
+  if (Mid.empty())
+    Mid = "_";
+  return (Style.Prefix + Mid + Style.Suffix).str();
 }
 
 static StyleKind findStyleKind(
diff --git a/clang-tools-extra/test/clang-tidy/readability-identifier-naming.cpp b/clang-tools-extra/test/clang-tidy/readability-identifier-naming.cpp
index 30a109b..60bd69a 100644
--- a/clang-tools-extra/test/clang-tidy/readability-identifier-naming.cpp
+++ b/clang-tools-extra/test/clang-tidy/readability-identifier-naming.cpp
@@ -175,6 +175,9 @@ private:
   int member2 = 2;
 // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: invalid case style for private member 'member2'
 // CHECK-FIXES: {{^}}  int __member2 = 2;{{$}}
+  int _memberWithExtraUnderscores_ = 42;
+// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: invalid case style for private member '_memberWithExtraUnderscores_'
+// CHECK-FIXES: {{^}}  int __memberWithExtraUnderscores = 42;{{$}}
 
 private:
     int private_member = 3;
-- 
2.7.4