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1 //===--- DraftStore.h - File contents container -----------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_DRAFTSTORE_H
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10 #define LLVM_CLANG_TOOLS_EXTRA_CLANGD_DRAFTSTORE_H
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11
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12 #include "support/Path.h"
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13 #include "clang/Basic/LLVM.h"
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14 #include "llvm/ADT/StringMap.h"
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15 #include "llvm/Support/VirtualFileSystem.h"
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16 #include <mutex>
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17 #include <optional>
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18 #include <string>
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19 #include <vector>
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20
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21 namespace clang {
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22 namespace clangd {
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23
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24 /// A thread-safe container for files opened in a workspace, addressed by
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25 /// filenames. The contents are owned by the DraftStore.
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26 /// Each time a draft is updated, it is assigned a version. This can be
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27 /// specified by the caller or incremented from the previous version.
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28 class DraftStore {
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29 public:
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30 struct Draft {
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31 std::shared_ptr<const std::string> Contents;
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32 std::string Version;
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33 };
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34
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35 /// \return Contents of the stored document.
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36 /// For untracked files, a std::nullopt is returned.
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37 std::optional<Draft> getDraft(PathRef File) const;
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38
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39 /// \return List of names of the drafts in this store.
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40 std::vector<Path> getActiveFiles() const;
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41
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42 /// Replace contents of the draft for \p File with \p Contents.
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43 /// If version is empty, one will be automatically assigned.
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44 /// Returns the version.
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45 std::string addDraft(PathRef File, llvm::StringRef Version,
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46 StringRef Contents);
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47
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48 /// Remove the draft from the store.
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49 void removeDraft(PathRef File);
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50
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51 llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> asVFS() const;
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52
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53 private:
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54 struct DraftAndTime {
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55 Draft D;
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56 std::time_t MTime;
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57 };
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58 mutable std::mutex Mutex;
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59 llvm::StringMap<DraftAndTime> Drafts;
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60 };
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61
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62 } // namespace clangd
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63 } // namespace clang
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64
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65 #endif
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