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llvm-project/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp

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//===--- IdentifierNamingCheck.cpp - clang-tidy ---------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "IdentifierNamingCheck.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/Lex/PPCallbacks.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMapInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Regex.h"
#define DEBUG_TYPE "clang-tidy"
// FixItHint
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace readability {
// clang-format off
#define NAMING_KEYS(m) \
m(Namespace) \
m(InlineNamespace) \
m(EnumConstant) \
m(ConstexprVariable) \
m(ConstantMember) \
m(PrivateMember) \
m(ProtectedMember) \
m(PublicMember) \
m(Member) \
m(ClassConstant) \
m(ClassMember) \
m(GlobalConstant) \
m(GlobalConstantPointer) \
m(GlobalPointer) \
m(GlobalVariable) \
m(LocalConstant) \
m(LocalConstantPointer) \
m(LocalPointer) \
m(LocalVariable) \
m(StaticConstant) \
m(StaticVariable) \
m(Constant) \
m(Variable) \
m(ConstantParameter) \
m(ParameterPack) \
m(Parameter) \
m(PointerParameter) \
m(ConstantPointerParameter) \
m(AbstractClass) \
m(Struct) \
m(Class) \
m(Union) \
m(Enum) \
m(GlobalFunction) \
m(ConstexprFunction) \
m(Function) \
m(ConstexprMethod) \
m(VirtualMethod) \
m(ClassMethod) \
m(PrivateMethod) \
m(ProtectedMethod) \
m(PublicMethod) \
m(Method) \
m(Typedef) \
m(TypeTemplateParameter) \
m(ValueTemplateParameter) \
m(TemplateTemplateParameter) \
m(TemplateParameter) \
m(TypeAlias) \
m(MacroDefinition) \
m(ObjcIvar) \
enum StyleKind {
#define ENUMERATE(v) SK_ ## v,
NAMING_KEYS(ENUMERATE)
#undef ENUMERATE
SK_Count,
SK_Invalid
};
static StringRef const StyleNames[] = {
#define STRINGIZE(v) #v,
NAMING_KEYS(STRINGIZE)
#undef STRINGIZE
};
#undef NAMING_KEYS
// clang-format on
static constexpr std::pair<StringRef, IdentifierNamingCheck::CaseType>
Mapping[] = {
{"aNy_CasE", IdentifierNamingCheck::CT_AnyCase},
{"lower_case", IdentifierNamingCheck::CT_LowerCase},
{"UPPER_CASE", IdentifierNamingCheck::CT_UpperCase},
{"camelBack", IdentifierNamingCheck::CT_CamelBack},
{"CamelCase", IdentifierNamingCheck::CT_CamelCase},
{"Camel_Snake_Case", IdentifierNamingCheck::CT_CamelSnakeCase},
{"camel_Snake_Back", IdentifierNamingCheck::CT_CamelSnakeBack}};
namespace {
/// Callback supplies macros to IdentifierNamingCheck::checkMacro
class IdentifierNamingCheckPPCallbacks : public PPCallbacks {
public:
IdentifierNamingCheckPPCallbacks(Preprocessor *PP,
IdentifierNamingCheck *Check)
: PP(PP), Check(Check) {}
/// MacroDefined calls checkMacro for macros in the main file
void MacroDefined(const Token &MacroNameTok,
const MacroDirective *MD) override {
Check->checkMacro(PP->getSourceManager(), MacroNameTok, MD->getMacroInfo());
}
/// MacroExpands calls expandMacro for macros in the main file
void MacroExpands(const Token &MacroNameTok, const MacroDefinition &MD,
SourceRange /*Range*/,
const MacroArgs * /*Args*/) override {
Check->expandMacro(MacroNameTok, MD.getMacroInfo());
}
private:
Preprocessor *PP;
IdentifierNamingCheck *Check;
};
} // namespace
IdentifierNamingCheck::IdentifierNamingCheck(StringRef Name,
ClangTidyContext *Context)
: RenamerClangTidyCheck(Name, Context),
IgnoreFailedSplit(Options.get("IgnoreFailedSplit", false)),
IgnoreMainLikeFunctions(Options.get("IgnoreMainLikeFunctions", false)) {
for (auto const &Name : StyleNames) {
auto CaseOptional = [&]() -> llvm::Optional<CaseType> {
auto ValueOr = Options.get((Name + "Case").str(), makeArrayRef(Mapping));
if (ValueOr)
return *ValueOr;
llvm::logAllUnhandledErrors(
llvm::handleErrors(ValueOr.takeError(),
[](const MissingOptionError &) -> llvm::Error {
return llvm::Error::success();
}),
llvm::errs(), "warning: ");
return llvm::None;
}();
auto prefix = Options.get((Name + "Prefix").str(), "");
auto postfix = Options.get((Name + "Suffix").str(), "");
if (CaseOptional || !prefix.empty() || !postfix.empty()) {
NamingStyles.push_back(NamingStyle(CaseOptional, prefix, postfix));
} else {
NamingStyles.push_back(llvm::None);
}
}
}
IdentifierNamingCheck::~IdentifierNamingCheck() = default;
void IdentifierNamingCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
for (size_t i = 0; i < SK_Count; ++i) {
if (NamingStyles[i]) {
if (NamingStyles[i]->Case) {
Options.store(Opts, (StyleNames[i] + "Case").str(),
*NamingStyles[i]->Case, llvm::makeArrayRef(Mapping));
}
Options.store(Opts, (StyleNames[i] + "Prefix").str(),
NamingStyles[i]->Prefix);
Options.store(Opts, (StyleNames[i] + "Suffix").str(),
NamingStyles[i]->Suffix);
}
}
Options.store(Opts, "IgnoreFailedSplit", IgnoreFailedSplit);
Options.store(Opts, "IgnoreMainLikeFunctions", IgnoreMainLikeFunctions);
}
static bool matchesStyle(StringRef Name,
IdentifierNamingCheck::NamingStyle Style) {
static llvm::Regex Matchers[] = {
llvm::Regex("^.*$"),
llvm::Regex("^[a-z][a-z0-9_]*$"),
llvm::Regex("^[a-z][a-zA-Z0-9]*$"),
llvm::Regex("^[A-Z][A-Z0-9_]*$"),
llvm::Regex("^[A-Z][a-zA-Z0-9]*$"),
llvm::Regex("^[A-Z]([a-z0-9]*(_[A-Z])?)*"),
llvm::Regex("^[a-z]([a-z0-9]*(_[A-Z])?)*"),
};
if (Name.startswith(Style.Prefix))
Name = Name.drop_front(Style.Prefix.size());
else
return false;
if (Name.endswith(Style.Suffix))
Name = Name.drop_back(Style.Suffix.size());
else
return false;
// Ensure the name doesn't have any extra underscores beyond those specified
// in the prefix and suffix.
if (Name.startswith("_") || Name.endswith("_"))
return false;
if (Style.Case && !Matchers[static_cast<size_t>(*Style.Case)].match(Name))
return false;
return true;
}
static std::string fixupWithCase(StringRef Name,
IdentifierNamingCheck::CaseType Case) {
static llvm::Regex Splitter(
"([a-z0-9A-Z]*)(_+)|([A-Z]?[a-z0-9]+)([A-Z]|$)|([A-Z]+)([A-Z]|$)");
SmallVector<StringRef, 8> Substrs;
Name.split(Substrs, "_", -1, false);
SmallVector<StringRef, 8> Words;
for (auto Substr : Substrs) {
while (!Substr.empty()) {
SmallVector<StringRef, 8> Groups;
if (!Splitter.match(Substr, &Groups))
break;
if (Groups[2].size() > 0) {
Words.push_back(Groups[1]);
Substr = Substr.substr(Groups[0].size());
} else if (Groups[3].size() > 0) {
Words.push_back(Groups[3]);
Substr = Substr.substr(Groups[0].size() - Groups[4].size());
} else if (Groups[5].size() > 0) {
Words.push_back(Groups[5]);
Substr = Substr.substr(Groups[0].size() - Groups[6].size());
}
}
}
if (Words.empty())
return std::string(Name);
std::string Fixup;
switch (Case) {
case IdentifierNamingCheck::CT_AnyCase:
Fixup += Name;
break;
case IdentifierNamingCheck::CT_LowerCase:
for (auto const &Word : Words) {
if (&Word != &Words.front())
Fixup += "_";
Fixup += Word.lower();
}
break;
case IdentifierNamingCheck::CT_UpperCase:
for (auto const &Word : Words) {
if (&Word != &Words.front())
Fixup += "_";
Fixup += Word.upper();
}
break;
case IdentifierNamingCheck::CT_CamelCase:
for (auto const &Word : Words) {
Fixup += Word.substr(0, 1).upper();
Fixup += Word.substr(1).lower();
}
break;
case IdentifierNamingCheck::CT_CamelBack:
for (auto const &Word : Words) {
if (&Word == &Words.front()) {
Fixup += Word.lower();
} else {
Fixup += Word.substr(0, 1).upper();
Fixup += Word.substr(1).lower();
}
}
break;
case IdentifierNamingCheck::CT_CamelSnakeCase:
for (auto const &Word : Words) {
if (&Word != &Words.front())
Fixup += "_";
Fixup += Word.substr(0, 1).upper();
Fixup += Word.substr(1).lower();
}
break;
case IdentifierNamingCheck::CT_CamelSnakeBack:
for (auto const &Word : Words) {
if (&Word != &Words.front()) {
Fixup += "_";
Fixup += Word.substr(0, 1).upper();
} else {
Fixup += Word.substr(0, 1).lower();
}
Fixup += Word.substr(1).lower();
}
break;
}
return Fixup;
}
static bool isParamInMainLikeFunction(const ParmVarDecl &ParmDecl,
bool IncludeMainLike) {
const auto *FDecl =
dyn_cast_or_null<FunctionDecl>(ParmDecl.getParentFunctionOrMethod());
if (!FDecl)
return false;
if (FDecl->isMain())
return true;
if (!IncludeMainLike)
return false;
if (FDecl->getAccess() != AS_public && FDecl->getAccess() != AS_none)
return false;
enum MainType { None, Main, WMain };
auto IsCharPtrPtr = [](QualType QType) -> MainType {
if (QType.isNull())
return None;
if (QType = QType->getPointeeType(), QType.isNull())
return None;
if (QType = QType->getPointeeType(), QType.isNull())
return None;
if (QType->isCharType())
return Main;
if (QType->isWideCharType())
return WMain;
return None;
};
auto IsIntType = [](QualType QType) {
if (QType.isNull())
return false;
if (const auto *Builtin =
dyn_cast<BuiltinType>(QType->getUnqualifiedDesugaredType())) {
return Builtin->getKind() == BuiltinType::Int;
}
return false;
};
if (!IsIntType(FDecl->getReturnType()))
return false;
if (FDecl->getNumParams() < 2 || FDecl->getNumParams() > 3)
return false;
if (!IsIntType(FDecl->parameters()[0]->getType()))
return false;
MainType Type = IsCharPtrPtr(FDecl->parameters()[1]->getType());
if (Type == None)
return false;
if (FDecl->getNumParams() == 3 &&
IsCharPtrPtr(FDecl->parameters()[2]->getType()) != Type)
return false;
if (Type == Main) {
static llvm::Regex Matcher(
"(^[Mm]ain([_A-Z]|$))|([a-z0-9_]Main([_A-Z]|$))|(_main(_|$))");
assert(Matcher.isValid() && "Invalid Matcher for main like functions.");
return Matcher.match(FDecl->getName());
} else {
static llvm::Regex Matcher("(^((W[Mm])|(wm))ain([_A-Z]|$))|([a-z0-9_]W[Mm]"
"ain([_A-Z]|$))|(_wmain(_|$))");
assert(Matcher.isValid() && "Invalid Matcher for wmain like functions.");
return Matcher.match(FDecl->getName());
}
}
static std::string
fixupWithStyle(StringRef Name,
const IdentifierNamingCheck::NamingStyle &Style) {
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(
const NamedDecl *D,
const std::vector<llvm::Optional<IdentifierNamingCheck::NamingStyle>>
&NamingStyles,
bool IgnoreMainLikeFunctions) {
assert(D && D->getIdentifier() && !D->getName().empty() && !D->isImplicit() &&
"Decl must be an explicit identifier with a name.");
if (isa<ObjCIvarDecl>(D) && NamingStyles[SK_ObjcIvar])
return SK_ObjcIvar;
if (isa<TypedefDecl>(D) && NamingStyles[SK_Typedef])
return SK_Typedef;
if (isa<TypeAliasDecl>(D) && NamingStyles[SK_TypeAlias])
return SK_TypeAlias;
if (const auto *Decl = dyn_cast<NamespaceDecl>(D)) {
if (Decl->isAnonymousNamespace())
return SK_Invalid;
if (Decl->isInline() && NamingStyles[SK_InlineNamespace])
return SK_InlineNamespace;
if (NamingStyles[SK_Namespace])
return SK_Namespace;
}
if (isa<EnumDecl>(D) && NamingStyles[SK_Enum])
return SK_Enum;
if (isa<EnumConstantDecl>(D)) {
if (NamingStyles[SK_EnumConstant])
return SK_EnumConstant;
if (NamingStyles[SK_Constant])
return SK_Constant;
return SK_Invalid;
}
if (const auto *Decl = dyn_cast<CXXRecordDecl>(D)) {
if (Decl->isAnonymousStructOrUnion())
return SK_Invalid;
if (!Decl->getCanonicalDecl()->isThisDeclarationADefinition())
return SK_Invalid;
if (Decl->hasDefinition() && Decl->isAbstract() &&
NamingStyles[SK_AbstractClass])
return SK_AbstractClass;
if (Decl->isStruct() && NamingStyles[SK_Struct])
return SK_Struct;
if (Decl->isStruct() && NamingStyles[SK_Class])
return SK_Class;
if (Decl->isClass() && NamingStyles[SK_Class])
return SK_Class;
if (Decl->isClass() && NamingStyles[SK_Struct])
return SK_Struct;
if (Decl->isUnion() && NamingStyles[SK_Union])
return SK_Union;
if (Decl->isEnum() && NamingStyles[SK_Enum])
return SK_Enum;
return SK_Invalid;
}
if (const auto *Decl = dyn_cast<FieldDecl>(D)) {
QualType Type = Decl->getType();
if (!Type.isNull() && Type.isConstQualified()) {
if (NamingStyles[SK_ConstantMember])
return SK_ConstantMember;
if (NamingStyles[SK_Constant])
return SK_Constant;
}
if (Decl->getAccess() == AS_private && NamingStyles[SK_PrivateMember])
return SK_PrivateMember;
if (Decl->getAccess() == AS_protected && NamingStyles[SK_ProtectedMember])
return SK_ProtectedMember;
if (Decl->getAccess() == AS_public && NamingStyles[SK_PublicMember])
return SK_PublicMember;
if (NamingStyles[SK_Member])
return SK_Member;
return SK_Invalid;
}
if (const auto *Decl = dyn_cast<ParmVarDecl>(D)) {
if (isParamInMainLikeFunction(*Decl, IgnoreMainLikeFunctions))
return SK_Invalid;
QualType Type = Decl->getType();
if (Decl->isConstexpr() && NamingStyles[SK_ConstexprVariable])
return SK_ConstexprVariable;
if (!Type.isNull() && Type.isConstQualified()) {
if (Type.getTypePtr()->isAnyPointerType() && NamingStyles[SK_ConstantPointerParameter])
return SK_ConstantPointerParameter;
if (NamingStyles[SK_ConstantParameter])
return SK_ConstantParameter;
if (NamingStyles[SK_Constant])
return SK_Constant;
}
if (Decl->isParameterPack() && NamingStyles[SK_ParameterPack])
return SK_ParameterPack;
if (!Type.isNull() && Type.getTypePtr()->isAnyPointerType() && NamingStyles[SK_PointerParameter])
return SK_PointerParameter;
if (NamingStyles[SK_Parameter])
return SK_Parameter;
return SK_Invalid;
}
if (const auto *Decl = dyn_cast<VarDecl>(D)) {
QualType Type = Decl->getType();
if (Decl->isConstexpr() && NamingStyles[SK_ConstexprVariable])
return SK_ConstexprVariable;
if (!Type.isNull() && Type.isConstQualified()) {
if (Decl->isStaticDataMember() && NamingStyles[SK_ClassConstant])
return SK_ClassConstant;
if (Decl->isFileVarDecl() && Type.getTypePtr()->isAnyPointerType() && NamingStyles[SK_GlobalConstantPointer])
return SK_GlobalConstantPointer;
if (Decl->isFileVarDecl() && NamingStyles[SK_GlobalConstant])
return SK_GlobalConstant;
if (Decl->isStaticLocal() && NamingStyles[SK_StaticConstant])
return SK_StaticConstant;
if (Decl->isLocalVarDecl() && Type.getTypePtr()->isAnyPointerType() && NamingStyles[SK_LocalConstantPointer])
return SK_LocalConstantPointer;
if (Decl->isLocalVarDecl() && NamingStyles[SK_LocalConstant])
return SK_LocalConstant;
if (Decl->isFunctionOrMethodVarDecl() && NamingStyles[SK_LocalConstant])
return SK_LocalConstant;
if (NamingStyles[SK_Constant])
return SK_Constant;
}
if (Decl->isStaticDataMember() && NamingStyles[SK_ClassMember])
return SK_ClassMember;
if (Decl->isFileVarDecl() && Type.getTypePtr()->isAnyPointerType() && NamingStyles[SK_GlobalPointer])
return SK_GlobalPointer;
if (Decl->isFileVarDecl() && NamingStyles[SK_GlobalVariable])
return SK_GlobalVariable;
if (Decl->isStaticLocal() && NamingStyles[SK_StaticVariable])
return SK_StaticVariable;
if (Decl->isLocalVarDecl() && Type.getTypePtr()->isAnyPointerType() && NamingStyles[SK_LocalPointer])
return SK_LocalPointer;
if (Decl->isLocalVarDecl() && NamingStyles[SK_LocalVariable])
return SK_LocalVariable;
if (Decl->isFunctionOrMethodVarDecl() && NamingStyles[SK_LocalVariable])
return SK_LocalVariable;
if (NamingStyles[SK_Variable])
return SK_Variable;
return SK_Invalid;
}
if (const auto *Decl = dyn_cast<CXXMethodDecl>(D)) {
if (Decl->isMain() || !Decl->isUserProvided() ||
Decl->size_overridden_methods() > 0)
return SK_Invalid;
// If this method has the same name as any base method, this is likely
// necessary even if it's not an override. e.g. CRTP.
auto FindHidden = [&](const CXXBaseSpecifier *S, clang::CXXBasePath &P) {
return CXXRecordDecl::FindOrdinaryMember(S, P, Decl->getDeclName());
};
CXXBasePaths UnusedPaths;
if (Decl->getParent()->lookupInBases(FindHidden, UnusedPaths))
return SK_Invalid;
if (Decl->isConstexpr() && NamingStyles[SK_ConstexprMethod])
return SK_ConstexprMethod;
if (Decl->isConstexpr() && NamingStyles[SK_ConstexprFunction])
return SK_ConstexprFunction;
if (Decl->isStatic() && NamingStyles[SK_ClassMethod])
return SK_ClassMethod;
if (Decl->isVirtual() && NamingStyles[SK_VirtualMethod])
return SK_VirtualMethod;
if (Decl->getAccess() == AS_private && NamingStyles[SK_PrivateMethod])
return SK_PrivateMethod;
if (Decl->getAccess() == AS_protected && NamingStyles[SK_ProtectedMethod])
return SK_ProtectedMethod;
if (Decl->getAccess() == AS_public && NamingStyles[SK_PublicMethod])
return SK_PublicMethod;
if (NamingStyles[SK_Method])
return SK_Method;
if (NamingStyles[SK_Function])
return SK_Function;
return SK_Invalid;
}
if (const auto *Decl = dyn_cast<FunctionDecl>(D)) {
if (Decl->isMain())
return SK_Invalid;
if (Decl->isConstexpr() && NamingStyles[SK_ConstexprFunction])
return SK_ConstexprFunction;
if (Decl->isGlobal() && NamingStyles[SK_GlobalFunction])
return SK_GlobalFunction;
if (NamingStyles[SK_Function])
return SK_Function;
}
if (isa<TemplateTypeParmDecl>(D)) {
if (NamingStyles[SK_TypeTemplateParameter])
return SK_TypeTemplateParameter;
if (NamingStyles[SK_TemplateParameter])
return SK_TemplateParameter;
return SK_Invalid;
}
if (isa<NonTypeTemplateParmDecl>(D)) {
if (NamingStyles[SK_ValueTemplateParameter])
return SK_ValueTemplateParameter;
if (NamingStyles[SK_TemplateParameter])
return SK_TemplateParameter;
return SK_Invalid;
}
if (isa<TemplateTemplateParmDecl>(D)) {
if (NamingStyles[SK_TemplateTemplateParameter])
return SK_TemplateTemplateParameter;
if (NamingStyles[SK_TemplateParameter])
return SK_TemplateParameter;
return SK_Invalid;
}
return SK_Invalid;
}
llvm::Optional<RenamerClangTidyCheck::FailureInfo>
IdentifierNamingCheck::GetDeclFailureInfo(const NamedDecl *Decl,
const SourceManager &SM) const {
StyleKind SK = findStyleKind(Decl, NamingStyles, IgnoreMainLikeFunctions);
if (SK == SK_Invalid)
return None;
if (!NamingStyles[SK])
return None;
const NamingStyle &Style = *NamingStyles[SK];
StringRef Name = Decl->getName();
if (matchesStyle(Name, Style))
return None;
std::string KindName = fixupWithCase(StyleNames[SK], CT_LowerCase);
std::replace(KindName.begin(), KindName.end(), '_', ' ');
std::string Fixup = fixupWithStyle(Name, Style);
if (StringRef(Fixup).equals(Name)) {
if (!IgnoreFailedSplit) {
LLVM_DEBUG(llvm::dbgs()
<< Decl->getBeginLoc().printToString(SM)
<< llvm::format(": unable to split words for %s '%s'\n",
KindName.c_str(), Name.str().c_str()));
}
return None;
}
return FailureInfo{std::move(KindName), std::move(Fixup)};
}
llvm::Optional<RenamerClangTidyCheck::FailureInfo>
IdentifierNamingCheck::GetMacroFailureInfo(const Token &MacroNameTok,
const SourceManager &SM) const {
if (!NamingStyles[SK_MacroDefinition])
return None;
StringRef Name = MacroNameTok.getIdentifierInfo()->getName();
const NamingStyle &Style = *NamingStyles[SK_MacroDefinition];
if (matchesStyle(Name, Style))
return None;
std::string KindName =
fixupWithCase(StyleNames[SK_MacroDefinition], CT_LowerCase);
std::replace(KindName.begin(), KindName.end(), '_', ' ');
std::string Fixup = fixupWithStyle(Name, Style);
if (StringRef(Fixup).equals(Name)) {
if (!IgnoreFailedSplit) {
LLVM_DEBUG(llvm::dbgs()
<< MacroNameTok.getLocation().printToString(SM)
<< llvm::format(": unable to split words for %s '%s'\n",
KindName.c_str(), Name.str().c_str()));
}
return None;
}
return FailureInfo{std::move(KindName), std::move(Fixup)};
}
RenamerClangTidyCheck::DiagInfo
IdentifierNamingCheck::GetDiagInfo(const NamingCheckId &ID,
const NamingCheckFailure &Failure) const {
return DiagInfo{"invalid case style for %0 '%1'",
[&](DiagnosticBuilder &diag) {
diag << Failure.Info.KindName << ID.second;
}};
}
} // namespace readability
} // namespace tidy
} // namespace clang
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