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//===-- ClangChangeNamespace.cpp - Standalone change namespace ------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// This tool can be used to change the surrounding namespaces of class/function
// definitions.
//
// Example: test.cc
// namespace na {
// class X {};
// namespace nb {
// class Y { X x; };
// } // namespace nb
// } // namespace na
// To move the definition of class Y from namespace "na::nb" to "x::y", run:
// clang-change-namespace --old_namespace "na::nb" \
// --new_namespace "x::y" --file_pattern "test.cc" test.cc --
// Output:
// namespace na {
// class X {};
// } // namespace na
// namespace x {
// namespace y {
// class Y { na::X x; };
// } // namespace y
// } // namespace x
#include "ChangeNamespace.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Rewrite/Core/Rewriter.h"
#include "clang/Tooling/CommonOptionsParser.h"
#include "clang/Tooling/Refactoring.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/YAMLTraits.h"
using namespace clang;
using namespace llvm;
namespace {
cl::OptionCategory ChangeNamespaceCategory("Change namespace.");
cl::opt<std::string> OldNamespace("old_namespace", cl::Required,
cl::desc("Old namespace."),
cl::cat(ChangeNamespaceCategory));
cl::opt<std::string> NewNamespace("new_namespace", cl::Required,
cl::desc("New namespace."),
cl::cat(ChangeNamespaceCategory));
cl::opt<std::string> FilePattern(
"file_pattern", cl::Required,
cl::desc("Only rename namespaces in files that match the given pattern."),
cl::cat(ChangeNamespaceCategory));
cl::opt<bool> Inplace("i", cl::desc("Inplace edit <file>s, if specified."),
cl::cat(ChangeNamespaceCategory));
cl::opt<bool>
DumpYAML("dump_result",
cl::desc("Dump new file contents in YAML, if specified."),
cl::cat(ChangeNamespaceCategory));
cl::opt<std::string> Style("style",
cl::desc("The style name used for reformatting."),
cl::init("LLVM"), cl::cat(ChangeNamespaceCategory));
cl::opt<std::string> WhiteListFile(
"whitelist_file",
cl::desc("A file containing regexes of symbol names that are not expected "
"to be updated when changing namespaces around them."),
cl::init(""), cl::cat(ChangeNamespaceCategory));
llvm::ErrorOr<std::vector<std::string>> GetWhiteListedSymbolPatterns() {
std::vector<std::string> Patterns;
if (WhiteListFile.empty())
return Patterns;
llvm::SmallVector<StringRef, 8> Lines;
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
llvm::MemoryBuffer::getFile(WhiteListFile);
if (!File)
return File.getError();
llvm::StringRef Content = File.get()->getBuffer();
Content.split(Lines, '\n', /*MaxSplit=*/-1, /*KeepEmpty=*/false);
for (auto Line : Lines)
Patterns.push_back(Line.trim());
return Patterns;
}
} // anonymous namespace
int main(int argc, const char **argv) {
llvm::sys::PrintStackTraceOnErrorSignal(argv[0]);
tooling::CommonOptionsParser OptionsParser(argc, argv,
ChangeNamespaceCategory);
const auto &Files = OptionsParser.getSourcePathList();
tooling::RefactoringTool Tool(OptionsParser.getCompilations(), Files);
llvm::ErrorOr<std::vector<std::string>> WhiteListPatterns =
GetWhiteListedSymbolPatterns();
if (!WhiteListPatterns) {
llvm::errs() << "Failed to open whitelist file " << WhiteListFile << ". "
<< WhiteListPatterns.getError().message() << "\n";
return 1;
}
change_namespace::ChangeNamespaceTool NamespaceTool(
OldNamespace, NewNamespace, FilePattern, *WhiteListPatterns,
&Tool.getReplacements(), Style);
ast_matchers::MatchFinder Finder;
NamespaceTool.registerMatchers(&Finder);
std::unique_ptr<tooling::FrontendActionFactory> Factory =
tooling::newFrontendActionFactory(&Finder);
if (int Result = Tool.run(Factory.get()))
return Result;
LangOptions DefaultLangOptions;
IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
clang::TextDiagnosticPrinter DiagnosticPrinter(errs(), &*DiagOpts);
DiagnosticsEngine Diagnostics(
IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs()), &*DiagOpts,
&DiagnosticPrinter, false);
auto &FileMgr = Tool.getFiles();
SourceManager Sources(Diagnostics, FileMgr);
Rewriter Rewrite(Sources, DefaultLangOptions);
if (!formatAndApplyAllReplacements(Tool.getReplacements(), Rewrite, Style)) {
llvm::errs() << "Failed applying all replacements.\n";
return 1;
}
if (Inplace)
return Rewrite.overwriteChangedFiles();
std::set<llvm::StringRef> ChangedFiles;
for (const auto &it : Tool.getReplacements())
ChangedFiles.insert(it.first);
if (DumpYAML) {
auto WriteToYAML = [&](llvm::raw_ostream &OS) {
OS << "[\n";
for (auto I = ChangedFiles.begin(), E = ChangedFiles.end(); I != E; ++I) {
OS << " {\n";
OS << " \"FilePath\": \"" << *I << "\",\n";
const auto *Entry = FileMgr.getFile(*I);
auto ID = Sources.getOrCreateFileID(Entry, SrcMgr::C_User);
std::string Content;
llvm::raw_string_ostream ContentStream(Content);
Rewrite.getEditBuffer(ID).write(ContentStream);
OS << " \"SourceText\": \""
<< llvm::yaml::escape(ContentStream.str()) << "\"\n";
OS << " }";
if (I != std::prev(E))
OS << ",\n";
}
OS << "\n]\n";
};
WriteToYAML(llvm::outs());
return 0;
}
for (const auto &File : ChangedFiles) {
const auto *Entry = FileMgr.getFile(File);
auto ID = Sources.getOrCreateFileID(Entry, SrcMgr::C_User);
outs() << "============== " << File << " ==============\n";
Rewrite.getEditBuffer(ID).write(llvm::outs());
outs() << "\n============================================\n";
}
return 0;
}
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