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//===---------- NamespaceAliaser.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 "NamespaceAliaser.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;
NamespaceAliaser::NamespaceAliaser(const SourceManager &SourceMgr)
: SourceMgr(SourceMgr) {}
AST_MATCHER_P(NamespaceAliasDecl, hasTargetNamespace,
ast_matchers::internal::Matcher<NamespaceDecl>, innerMatcher) {
return innerMatcher.matches(*Node.getNamespace(), Finder, Builder);
}
std::optional<FixItHint>
NamespaceAliaser::createAlias(ASTContext &Context, const Stmt &Statement,
StringRef Namespace,
const std::vector<std::string> &Abbreviations) {
const FunctionDecl *Function = getSurroundingFunction(Context, Statement);
if (!Function || !Function->hasBody())
return std::nullopt;
if (AddedAliases[Function].count(Namespace.str()) != 0)
return std::nullopt;
// FIXME: Doesn't consider the order of declarations.
// If we accidentally pick an alias defined later in the function,
// the output won't compile.
// FIXME: Also doesn't consider file or class-scope aliases.
const auto *ExistingAlias = selectFirst<NamedDecl>(
"alias", match(functionDecl(hasBody(compoundStmt(has(declStmt(
has(namespaceAliasDecl(hasTargetNamespace(hasName(
std::string(Namespace))))
.bind("alias"))))))),
*Function, Context));
if (ExistingAlias != nullptr) {
AddedAliases[Function][Namespace.str()] = ExistingAlias->getName().str();
return std::nullopt;
}
for (const auto &Abbreviation : Abbreviations) {
DeclarationMatcher ConflictMatcher = namedDecl(hasName(Abbreviation));
const auto HasConflictingChildren =
!match(findAll(ConflictMatcher), *Function, Context).empty();
const auto HasConflictingAncestors =
!match(functionDecl(hasAncestor(decl(has(ConflictMatcher)))), *Function,
Context)
.empty();
if (HasConflictingAncestors || HasConflictingChildren)
continue;
std::string Declaration =
(llvm::Twine("\nnamespace ") + Abbreviation + " = " + Namespace + ";")
.str();
SourceLocation Loc =
Lexer::getLocForEndOfToken(Function->getBody()->getBeginLoc(), 0,
SourceMgr, Context.getLangOpts());
AddedAliases[Function][Namespace.str()] = Abbreviation;
return FixItHint::CreateInsertion(Loc, Declaration);
}
return std::nullopt;
}
std::string NamespaceAliaser::getNamespaceName(ASTContext &Context,
const Stmt &Statement,
StringRef Namespace) const {
const auto *Function = getSurroundingFunction(Context, Statement);
auto FunctionAliases = AddedAliases.find(Function);
if (FunctionAliases != AddedAliases.end()) {
if (FunctionAliases->second.count(Namespace) != 0) {
return FunctionAliases->second.find(Namespace)->getValue();
}
}
return Namespace.str();
}
} // namespace clang::tidy::utils
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