forked from OSchip/llvm-project
129 lines
3.9 KiB
C++
129 lines
3.9 KiB
C++
//===--- DraftStore.cpp - File contents container ---------------*- C++ -*-===//
|
|
//
|
|
// 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 "DraftStore.h"
|
|
#include "SourceCode.h"
|
|
#include "support/Logger.h"
|
|
#include "llvm/ADT/StringExtras.h"
|
|
#include "llvm/Support/Errc.h"
|
|
#include "llvm/Support/VirtualFileSystem.h"
|
|
#include <memory>
|
|
|
|
namespace clang {
|
|
namespace clangd {
|
|
|
|
llvm::Optional<DraftStore::Draft> DraftStore::getDraft(PathRef File) const {
|
|
std::lock_guard<std::mutex> Lock(Mutex);
|
|
|
|
auto It = Drafts.find(File);
|
|
if (It == Drafts.end())
|
|
return None;
|
|
|
|
return It->second.D;
|
|
}
|
|
|
|
std::vector<Path> DraftStore::getActiveFiles() const {
|
|
std::lock_guard<std::mutex> Lock(Mutex);
|
|
std::vector<Path> ResultVector;
|
|
|
|
for (auto DraftIt = Drafts.begin(); DraftIt != Drafts.end(); DraftIt++)
|
|
ResultVector.push_back(std::string(DraftIt->getKey()));
|
|
|
|
return ResultVector;
|
|
}
|
|
|
|
static void increment(std::string &S) {
|
|
// Ensure there is a numeric suffix.
|
|
if (S.empty() || !llvm::isDigit(S.back())) {
|
|
S.push_back('0');
|
|
return;
|
|
}
|
|
// Increment the numeric suffix.
|
|
auto I = S.rbegin(), E = S.rend();
|
|
for (;;) {
|
|
if (I == E || !llvm::isDigit(*I)) {
|
|
// Reached start of numeric section, it was all 9s.
|
|
S.insert(I.base(), '1');
|
|
break;
|
|
}
|
|
if (*I != '9') {
|
|
// Found a digit we can increment, we're done.
|
|
++*I;
|
|
break;
|
|
}
|
|
*I = '0'; // and keep incrementing to the left.
|
|
}
|
|
}
|
|
|
|
static void updateVersion(DraftStore::Draft &D,
|
|
llvm::StringRef SpecifiedVersion) {
|
|
if (!SpecifiedVersion.empty()) {
|
|
// We treat versions as opaque, but the protocol says they increase.
|
|
if (SpecifiedVersion.compare_numeric(D.Version) <= 0)
|
|
log("File version went from {0} to {1}", D.Version, SpecifiedVersion);
|
|
D.Version = SpecifiedVersion.str();
|
|
} else {
|
|
// Note that if D was newly-created, this will bump D.Version from "" to 1.
|
|
increment(D.Version);
|
|
}
|
|
}
|
|
|
|
std::string DraftStore::addDraft(PathRef File, llvm::StringRef Version,
|
|
llvm::StringRef Contents) {
|
|
std::lock_guard<std::mutex> Lock(Mutex);
|
|
|
|
auto &D = Drafts[File];
|
|
updateVersion(D.D, Version);
|
|
std::time(&D.MTime);
|
|
D.D.Contents = std::make_shared<std::string>(Contents);
|
|
return D.D.Version;
|
|
}
|
|
|
|
void DraftStore::removeDraft(PathRef File) {
|
|
std::lock_guard<std::mutex> Lock(Mutex);
|
|
|
|
Drafts.erase(File);
|
|
}
|
|
|
|
namespace {
|
|
|
|
/// A read only MemoryBuffer shares ownership of a ref counted string. The
|
|
/// shared string object must not be modified while an owned by this buffer.
|
|
class SharedStringBuffer : public llvm::MemoryBuffer {
|
|
const std::shared_ptr<const std::string> BufferContents;
|
|
const std::string Name;
|
|
|
|
public:
|
|
BufferKind getBufferKind() const override {
|
|
return MemoryBuffer::MemoryBuffer_Malloc;
|
|
}
|
|
|
|
StringRef getBufferIdentifier() const override { return Name; }
|
|
|
|
SharedStringBuffer(std::shared_ptr<const std::string> Data, StringRef Name)
|
|
: BufferContents(std::move(Data)), Name(Name) {
|
|
assert(BufferContents && "Can't create from empty shared_ptr");
|
|
MemoryBuffer::init(BufferContents->c_str(),
|
|
BufferContents->c_str() + BufferContents->size(),
|
|
/*RequiresNullTerminator=*/true);
|
|
}
|
|
};
|
|
} // namespace
|
|
|
|
llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> DraftStore::asVFS() const {
|
|
auto MemFS = llvm::makeIntrusiveRefCnt<llvm::vfs::InMemoryFileSystem>();
|
|
std::lock_guard<std::mutex> Guard(Mutex);
|
|
for (const auto &Draft : Drafts)
|
|
MemFS->addFile(Draft.getKey(), Draft.getValue().MTime,
|
|
std::make_unique<SharedStringBuffer>(
|
|
Draft.getValue().D.Contents, Draft.getKey()));
|
|
return MemFS;
|
|
}
|
|
} // namespace clangd
|
|
} // namespace clang
|