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| 1 | //===-- include/flang/Parser/char-buffer.h ----------------------*- C++ -*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef FORTRAN_PARSER_CHAR_BUFFER_H_ |
| 10 | #define FORTRAN_PARSER_CHAR_BUFFER_H_ |
| 11 | |
| 12 | // Defines a simple expandable buffer suitable for efficiently accumulating |
| 13 | // a stream of bytes. |
| 14 | |
| 15 | #include <cstddef> |
| 16 | #include <list> |
| 17 | #include <string> |
| 18 | #include <utility> |
| 19 | #include <vector> |
| 20 | |
| 21 | namespace Fortran::parser { |
| 22 | |
| 23 | class CharBuffer { |
| 24 | public: |
| 25 | CharBuffer() {} |
| 26 | CharBuffer(CharBuffer &&that) |
| 27 | : blocks_(std::move(that.blocks_)), bytes_{that.bytes_}, |
| 28 | lastBlockEmpty_{that.lastBlockEmpty_} { |
| 29 | that.clear(); |
| 30 | } |
| 31 | CharBuffer &operator=(CharBuffer &&that) { |
| 32 | blocks_ = std::move(that.blocks_); |
| 33 | bytes_ = that.bytes_; |
| 34 | lastBlockEmpty_ = that.lastBlockEmpty_; |
| 35 | that.clear(); |
| 36 | return *this; |
| 37 | } |
| 38 | |
| 39 | bool empty() const { return bytes_ == 0; } |
| 40 | std::size_t bytes() const { return bytes_; } |
| 41 | |
| 42 | void clear() { |
| 43 | blocks_.clear(); |
| 44 | bytes_ = 0; |
| 45 | lastBlockEmpty_ = false; |
| 46 | } |
| 47 | |
| 48 | char *FreeSpace(std::size_t &); |
| 49 | void Claim(std::size_t); |
| 50 | |
| 51 | // The return value is the byte offset of the new data, |
| 52 | // i.e. the value of size() before the call. |
| 53 | std::size_t Put(const char *data, std::size_t n); |
| 54 | std::size_t Put(const std::string &); |
| 55 | std::size_t Put(char x) { return Put(&x, 1); } |
| 56 | |
| 57 | std::string Marshal() const; |
| 58 | |
| 59 | private: |
| 60 | struct Block { |
| 61 | static constexpr std::size_t capacity{1 << 20}; |
| 62 | char data[capacity]; |
| 63 | }; |
| 64 | |
| 65 | int LastBlockOffset() const { return bytes_ % Block::capacity; } |
| 66 | std::list<Block> blocks_; |
| 67 | std::size_t bytes_{0}; |
| 68 | bool lastBlockEmpty_{false}; |
| 69 | }; |
| 70 | } // namespace Fortran::parser |
| 71 | #endif // FORTRAN_PARSER_CHAR_BUFFER_H_ |
| 72 |
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