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crypto/fift/SourceLookup.h

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+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#pragma once
+#include <iostream>
+
+#include "td/utils/Status.h"
+
+namespace fift {
+class FileLoader {
+ public:
+  virtual ~FileLoader() = default;
+  struct File {
+    std::string data;
+    std::string path;
+  };
+  virtual td::Result<File> read_file(td::CSlice filename) = 0;
+  virtual td::Status write_file(td::CSlice filename, td::Slice data) = 0;
+  virtual td::Result<File> read_file_part(td::CSlice filename, td::int64 size, td::int64 offset) = 0;
+  virtual bool is_file_exists(td::CSlice filename) = 0;
+};
+
+class OsFileLoader : public FileLoader {
+ public:
+  td::Result<File> read_file(td::CSlice filename) override;
+  td::Status write_file(td::CSlice filename, td::Slice data) override;
+  td::Result<File> read_file_part(td::CSlice filename, td::int64 size, td::int64 offset) override;
+  bool is_file_exists(td::CSlice filename) override;
+};
+
+class SourceLookup {
+ public:
+  SourceLookup() = default;
+  explicit SourceLookup(std::unique_ptr<FileLoader> file_loader) : file_loader_(std::move(file_loader)) {
+  }
+  void add_include_path(td::string path);
+  td::Result<FileLoader::File> lookup_source(std::string filename, std::string current_dir);
+
+  td::Result<FileLoader::File> read_file(td::CSlice path) {
+    return file_loader_->read_file(path);
+  }
+  td::Status write_file(td::CSlice path, td::Slice data) {
+    return file_loader_->write_file(path, data);
+  }
+  td::Result<FileLoader::File> read_file_part(td::CSlice filename, td::int64 size, td::int64 offset) {
+    return file_loader_->read_file_part(filename, size, offset);
+  }
+  bool is_file_exists(td::CSlice filename) {
+    return file_loader_->is_file_exists(filename);
+  }
+
+ protected:
+  std::unique_ptr<FileLoader> file_loader_;
+  std::vector<std::string> source_include_path_;
+};
+}  // namespace fift