97 lines
3.5 KiB
C++
97 lines
3.5 KiB
C++
//===---------- NamespaceAliaser.cpp - clang-tidy -------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "NamespaceAliaser.h"
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#include "ASTUtils.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include "clang/ASTMatchers/ASTMatchers.h"
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#include "clang/Lex/Lexer.h"
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namespace clang {
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namespace tidy {
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namespace utils {
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using namespace ast_matchers;
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NamespaceAliaser::NamespaceAliaser(const SourceManager &SourceMgr)
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: SourceMgr(SourceMgr) {}
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AST_MATCHER_P(NamespaceAliasDecl, hasTargetNamespace,
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ast_matchers::internal::Matcher<NamespaceDecl>, innerMatcher) {
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return innerMatcher.matches(*Node.getNamespace(), Finder, Builder);
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}
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Optional<FixItHint>
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NamespaceAliaser::createAlias(ASTContext &Context, const Stmt &Statement,
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StringRef Namespace,
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const std::vector<std::string> &Abbreviations) {
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const FunctionDecl *Function = getSurroundingFunction(Context, Statement);
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if (!Function || !Function->hasBody())
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return None;
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if (AddedAliases[Function].count(Namespace.str()) != 0)
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return None;
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// FIXME: Doesn't consider the order of declarations.
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// If we accidentally pick an alias defined later in the function,
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// the output won't compile.
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// FIXME: Also doesn't consider file or class-scope aliases.
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const auto *ExistingAlias = selectFirst<NamedDecl>(
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"alias", match(functionDecl(hasBody(compoundStmt(has(declStmt(
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has(namespaceAliasDecl(hasTargetNamespace(hasName(
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std::string(Namespace))))
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.bind("alias"))))))),
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*Function, Context));
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if (ExistingAlias != nullptr) {
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AddedAliases[Function][Namespace.str()] = ExistingAlias->getName().str();
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return None;
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}
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for (const auto &Abbreviation : Abbreviations) {
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DeclarationMatcher ConflictMatcher = namedDecl(hasName(Abbreviation));
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const auto HasConflictingChildren =
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!match(findAll(ConflictMatcher), *Function, Context).empty();
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const auto HasConflictingAncestors =
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!match(functionDecl(hasAncestor(decl(has(ConflictMatcher)))), *Function,
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Context)
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.empty();
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if (HasConflictingAncestors || HasConflictingChildren)
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continue;
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std::string Declaration =
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(llvm::Twine("\nnamespace ") + Abbreviation + " = " + Namespace + ";")
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.str();
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SourceLocation Loc =
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Lexer::getLocForEndOfToken(Function->getBody()->getBeginLoc(), 0,
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SourceMgr, Context.getLangOpts());
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AddedAliases[Function][Namespace.str()] = Abbreviation;
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return FixItHint::CreateInsertion(Loc, Declaration);
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}
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return None;
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}
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std::string NamespaceAliaser::getNamespaceName(ASTContext &Context,
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const Stmt &Statement,
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StringRef Namespace) const {
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const auto *Function = getSurroundingFunction(Context, Statement);
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auto FunctionAliases = AddedAliases.find(Function);
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if (FunctionAliases != AddedAliases.end()) {
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if (FunctionAliases->second.count(Namespace) != 0) {
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return FunctionAliases->second.find(Namespace)->getValue();
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}
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}
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return Namespace.str();
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}
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} // namespace utils
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} // namespace tidy
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} // namespace clang
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