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// Copyright 2016 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.!
#include "filesystem.h"
#include <iostream>
#include "util.h"
#ifdef OS_WIN
#define OUTPUT_MODE std::ios::binary | std::ios::out
#else
#define OUTPUT_MODE std::ios::out
#endif
namespace sentencepiece {
namespace filesystem {
class PosixReadableFile : public ReadableFile {
public:
PosixReadableFile(absl::string_view filename)
: is_(filename.empty() ? &std::cin
: new std::ifstream(WPATH(filename.data()))) {
if (!*is_)
status_ = util::StatusBuilder(util::error::NOT_FOUND)
<< "\"" << filename.data() << "\": " << util::StrError(errno);
}
~PosixReadableFile() {
if (is_ != &std::cin) delete is_;
}
util::Status status() const { return status_; }
bool ReadLine(std::string *line) {
return static_cast<bool>(std::getline(*is_, *line));
}
bool ReadAll(std::string *line) {
if (is_ == &std::cin) {
LOG(ERROR) << "ReadAll is not supported for stdin.";
return false;
}
line->assign(std::istreambuf_iterator<char>(*is_),
std::istreambuf_iterator<char>());
return true;
}
private:
util::Status status_;
std::istream *is_;
};
class PosixWritableFile : public WritableFile {
public:
PosixWritableFile(absl::string_view filename)
: os_(filename.empty()
? &std::cout
: new std::ofstream(WPATH(filename.data()), OUTPUT_MODE)) {
if (!*os_)
status_ = util::StatusBuilder(util::error::PERMISSION_DENIED)
<< "\"" << filename.data() << "\": " << util::StrError(errno);
}
~PosixWritableFile() {
if (os_ != &std::cout) delete os_;
}
util::Status status() const { return status_; }
bool Write(absl::string_view text) {
os_->write(text.data(), text.size());
return os_->good();
}
bool WriteLine(absl::string_view text) { return Write(text) && Write("\n"); }
private:
util::Status status_;
std::ostream *os_;
};
std::unique_ptr<ReadableFile> NewReadableFile(absl::string_view filename) {
return port::MakeUnique<PosixReadableFile>(filename);
}
std::unique_ptr<WritableFile> NewWritableFile(absl::string_view filename) {
return port::MakeUnique<PosixWritableFile>(filename);
}
} // namespace filesystem
} // namespace sentencepiece
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