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2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
113 lines
3.8 KiB
C++
113 lines
3.8 KiB
C++
//===--- ConcatNestedNamespacesCheck.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 "ConcatNestedNamespacesCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include <algorithm>
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#include <iterator>
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namespace clang {
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namespace tidy {
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namespace modernize {
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static bool locationsInSameFile(const SourceManager &Sources,
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SourceLocation Loc1, SourceLocation Loc2) {
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return Loc1.isFileID() && Loc2.isFileID() &&
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Sources.getFileID(Loc1) == Sources.getFileID(Loc2);
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}
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static bool anonymousOrInlineNamespace(const NamespaceDecl &ND) {
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return ND.isAnonymousNamespace() || ND.isInlineNamespace();
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}
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static bool singleNamedNamespaceChild(const NamespaceDecl &ND) {
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NamespaceDecl::decl_range Decls = ND.decls();
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if (std::distance(Decls.begin(), Decls.end()) != 1)
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return false;
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const auto *ChildNamespace = dyn_cast<const NamespaceDecl>(*Decls.begin());
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return ChildNamespace && !anonymousOrInlineNamespace(*ChildNamespace);
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}
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static bool alreadyConcatenated(std::size_t NumCandidates,
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const SourceRange &ReplacementRange,
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const SourceManager &Sources,
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const LangOptions &LangOpts) {
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CharSourceRange TextRange =
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Lexer::getAsCharRange(ReplacementRange, Sources, LangOpts);
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StringRef CurrentNamespacesText =
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Lexer::getSourceText(TextRange, Sources, LangOpts);
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return CurrentNamespacesText.count(':') == (NumCandidates - 1) * 2;
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}
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ConcatNestedNamespacesCheck::NamespaceString
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ConcatNestedNamespacesCheck::concatNamespaces() {
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NamespaceString Result("namespace ");
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Result.append(Namespaces.front()->getName());
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std::for_each(std::next(Namespaces.begin()), Namespaces.end(),
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[&Result](const NamespaceDecl *ND) {
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Result.append("::");
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Result.append(ND->getName());
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});
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return Result;
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}
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void ConcatNestedNamespacesCheck::registerMatchers(
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ast_matchers::MatchFinder *Finder) {
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if (!getLangOpts().CPlusPlus17)
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return;
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Finder->addMatcher(ast_matchers::namespaceDecl().bind("namespace"), this);
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}
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void ConcatNestedNamespacesCheck::reportDiagnostic(
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const SourceRange &FrontReplacement, const SourceRange &BackReplacement) {
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diag(Namespaces.front()->getBeginLoc(),
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"nested namespaces can be concatenated", DiagnosticIDs::Warning)
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<< FixItHint::CreateReplacement(FrontReplacement, concatNamespaces())
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<< FixItHint::CreateReplacement(BackReplacement, "}");
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}
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void ConcatNestedNamespacesCheck::check(
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const ast_matchers::MatchFinder::MatchResult &Result) {
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const NamespaceDecl &ND = *Result.Nodes.getNodeAs<NamespaceDecl>("namespace");
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const SourceManager &Sources = *Result.SourceManager;
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if (!locationsInSameFile(Sources, ND.getBeginLoc(), ND.getRBraceLoc()))
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return;
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if (!Sources.isInMainFile(ND.getBeginLoc()))
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return;
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if (anonymousOrInlineNamespace(ND))
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return;
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Namespaces.push_back(&ND);
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if (singleNamedNamespaceChild(ND))
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return;
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SourceRange FrontReplacement(Namespaces.front()->getBeginLoc(),
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Namespaces.back()->getLocation());
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SourceRange BackReplacement(Namespaces.back()->getRBraceLoc(),
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Namespaces.front()->getRBraceLoc());
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if (!alreadyConcatenated(Namespaces.size(), FrontReplacement, Sources,
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getLangOpts()))
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reportDiagnostic(FrontReplacement, BackReplacement);
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Namespaces.clear();
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}
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} // namespace modernize
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} // namespace tidy
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} // namespace clang
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