Ben Clayton | cd3c9b6 | 2020-04-02 14:33:46 +0100 | [diff] [blame] | 1 | // Copyright 2020 The Amber Authors. |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | #ifndef SRC_VIRTUAL_FILE_STORE_H_ |
| 16 | #define SRC_VIRTUAL_FILE_STORE_H_ |
| 17 | |
| 18 | #include <cassert> |
| 19 | #include <string> |
| 20 | #include <unordered_map> |
| 21 | |
| 22 | #include "amber/result.h" |
| 23 | |
| 24 | namespace amber { |
| 25 | |
| 26 | /// Stores a number of virtual files by path. |
| 27 | class VirtualFileStore { |
| 28 | public: |
| 29 | /// Return the path sanitized into a canonical form. |
| 30 | static std::string GetCanonical(const std::string& path); |
| 31 | |
| 32 | /// Adds the virtual file with content |content| to the virtual file path |
| 33 | /// |path|. If there's already a virtual file with the given path, an error is |
| 34 | /// returned. |
| 35 | Result Add(const std::string& path, const std::string& content) { |
| 36 | if (path.length() == 0) { |
| 37 | return Result("Virtual file path was empty"); |
| 38 | } |
| 39 | |
| 40 | auto canonical = GetCanonical(path); |
| 41 | |
| 42 | auto it = files_by_path_.find(canonical); |
| 43 | if (it != files_by_path_.end()) { |
| 44 | return Result("Virtual file '" + path + "' already declared"); |
| 45 | } |
| 46 | files_by_path_.emplace(canonical, content); |
| 47 | return {}; |
| 48 | } |
| 49 | |
| 50 | /// Look up the virtual file by path. If the file was found, the content is |
| 51 | /// assigned to content. |
| 52 | Result Get(const std::string& path, std::string* content) const { |
| 53 | assert(content); |
| 54 | |
| 55 | if (path.length() == 0) { |
| 56 | return Result("Virtual file path was empty"); |
| 57 | } |
| 58 | |
| 59 | auto canonical = GetCanonical(path); |
| 60 | |
| 61 | auto it = files_by_path_.find(canonical); |
| 62 | if (it == files_by_path_.end()) { |
| 63 | return Result("Virtual file '" + path + "' not found"); |
| 64 | } |
| 65 | *content = it->second; |
| 66 | return {}; |
| 67 | } |
| 68 | |
| 69 | private: |
| 70 | std::unordered_map<std::string, std::string> files_by_path_; |
| 71 | }; |
| 72 | |
| 73 | } // namespace amber |
| 74 | |
| 75 | #endif // SRC_VIRTUAL_FILE_STORE_H_ |