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//===---------- UsingInserter.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 "UsingInserter.h"
#include "ASTUtils.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/Lex/Lexer.h"
#include <optional>
namespace clang::tidy::utils {
using namespace ast_matchers;
static StringRef getUnqualifiedName(StringRef QualifiedName) {
size_t LastSeparatorPos = QualifiedName.rfind("::");
if (LastSeparatorPos == StringRef::npos)
return QualifiedName;
return QualifiedName.drop_front(LastSeparatorPos + 2);
}
UsingInserter::UsingInserter(const SourceManager &SourceMgr)
: SourceMgr(SourceMgr) {}
std::optional<FixItHint> UsingInserter::createUsingDeclaration(
ASTContext &Context, const Stmt &Statement, StringRef QualifiedName) {
StringRef UnqualifiedName = getUnqualifiedName(QualifiedName);
const FunctionDecl *Function = getSurroundingFunction(Context, Statement);
if (!Function)
return std::nullopt;
if (AddedUsing.count(std::make_pair(Function, QualifiedName.str())) != 0)
return std::nullopt;
SourceLocation InsertLoc = Lexer::getLocForEndOfToken(
Function->getBody()->getBeginLoc(), 0, SourceMgr, Context.getLangOpts());
// Only use using declarations in the main file, not in includes.
if (SourceMgr.getFileID(InsertLoc) != SourceMgr.getMainFileID())
return std::nullopt;
// FIXME: This declaration could be masked. Investigate if
// there is a way to avoid using Sema.
bool AlreadyHasUsingDecl =
!match(stmt(hasAncestor(decl(has(usingDecl(hasAnyUsingShadowDecl(
hasTargetDecl(hasName(QualifiedName.str())))))))),
Statement, Context)
.empty();
if (AlreadyHasUsingDecl) {
AddedUsing.emplace(NameInFunction(Function, QualifiedName.str()));
return std::nullopt;
}
// Find conflicting declarations and references.
auto ConflictingDecl = namedDecl(hasName(UnqualifiedName));
bool HasConflictingDeclaration =
!match(findAll(ConflictingDecl), *Function, Context).empty();
bool HasConflictingDeclRef =
!match(findAll(declRefExpr(to(ConflictingDecl))), *Function, Context)
.empty();
if (HasConflictingDeclaration || HasConflictingDeclRef)
return std::nullopt;
std::string Declaration =
(llvm::Twine("\nusing ") + QualifiedName + ";").str();
AddedUsing.emplace(std::make_pair(Function, QualifiedName.str()));
return FixItHint::CreateInsertion(InsertLoc, Declaration);
}
StringRef UsingInserter::getShortName(ASTContext &Context,
const Stmt &Statement,
StringRef QualifiedName) {
const FunctionDecl *Function = getSurroundingFunction(Context, Statement);
if (AddedUsing.count(NameInFunction(Function, QualifiedName.str())) != 0)
return getUnqualifiedName(QualifiedName);
return QualifiedName;
}
} // namespace clang::tidy::utils
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