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// Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
//
// 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.
#ifndef FORTRAN_PARSER_CHAR_BUFFER_H_
#define FORTRAN_PARSER_CHAR_BUFFER_H_
// Defines a simple expandable buffer suitable for efficiently accumulating
// a stream of bytes.
#include <cstddef>
#include <forward_list>
#include <string>
#include <utility>
#include <vector>
namespace Fortran::parser {
class CharBuffer {
public:
CharBuffer() {}
CharBuffer(CharBuffer &&that)
: blocks_(std::move(that.blocks_)), last_{that.last_}, bytes_{that.bytes_},
lastBlockEmpty_{that.lastBlockEmpty_} {
that.clear();
}
CharBuffer &operator=(CharBuffer &&that) {
blocks_ = std::move(that.blocks_);
last_ = that.last_;
bytes_ = that.bytes_;
lastBlockEmpty_ = that.lastBlockEmpty_;
that.clear();
return *this;
}
bool empty() const { return bytes_ == 0; }
std::size_t size() const { return bytes_; }
void clear() {
blocks_.clear();
last_ = blocks_.end();
bytes_ = 0;
lastBlockEmpty_ = false;
}
char *FreeSpace(std::size_t *);
void Claim(std::size_t);
// The return value is the byte offset of the new data,
// i.e. the value of size() before the call.
std::size_t Put(const char *data, std::size_t n);
std::size_t Put(const std::string &);
std::size_t Put(char x) { return Put(&x, 1); }
std::string Marshal() const;
// Removes carriage returns ('\r') and ensures a final line feed ('\n').
std::string MarshalNormalized() const;
private:
struct Block {
static constexpr std::size_t capacity{1 << 20};
char data[capacity];
};
int LastBlockOffset() const { return bytes_ % Block::capacity; }
std::forward_list<Block> blocks_;
std::forward_list<Block>::iterator last_{blocks_.end()};
std::size_t bytes_{0};
bool lastBlockEmpty_{false};
};
} // namespace Fortran::parser
#endif // FORTRAN_PARSER_CHAR_BUFFER_H_
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