f7e7cb349b
Original-commit: flang-compiler/f18@aa7f55e15f Reviewed-on: https://github.com/flang-compiler/f18/pull/217
83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
// Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef FORTRAN_PARSER_CHAR_BUFFER_H_
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#define FORTRAN_PARSER_CHAR_BUFFER_H_
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// Defines a simple expandable buffer suitable for efficiently accumulating
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// a stream of bytes.
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#include <cstddef>
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#include <forward_list>
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#include <string>
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#include <utility>
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#include <vector>
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namespace Fortran::parser {
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class CharBuffer {
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public:
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CharBuffer() {}
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CharBuffer(CharBuffer &&that)
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: blocks_(std::move(that.blocks_)), last_{that.last_}, bytes_{that.bytes_},
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lastBlockEmpty_{that.lastBlockEmpty_} {
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that.clear();
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}
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CharBuffer &operator=(CharBuffer &&that) {
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blocks_ = std::move(that.blocks_);
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last_ = that.last_;
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bytes_ = that.bytes_;
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lastBlockEmpty_ = that.lastBlockEmpty_;
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that.clear();
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return *this;
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}
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bool empty() const { return bytes_ == 0; }
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std::size_t size() const { return bytes_; }
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void clear() {
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blocks_.clear();
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last_ = blocks_.end();
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bytes_ = 0;
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lastBlockEmpty_ = false;
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}
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char *FreeSpace(std::size_t *);
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void Claim(std::size_t);
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// The return value is the byte offset of the new data,
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// i.e. the value of size() before the call.
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std::size_t Put(const char *data, std::size_t n);
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std::size_t Put(const std::string &);
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std::size_t Put(char x) { return Put(&x, 1); }
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std::string Marshal() const;
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// Removes carriage returns ('\r') and ensures a final line feed ('\n').
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std::string MarshalNormalized() const;
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private:
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struct Block {
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static constexpr std::size_t capacity{1 << 20};
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char data[capacity];
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};
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int LastBlockOffset() const { return bytes_ % Block::capacity; }
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std::forward_list<Block> blocks_;
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std::forward_list<Block>::iterator last_{blocks_.end()};
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std::size_t bytes_{0};
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bool lastBlockEmpty_{false};
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};
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}
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#endif // FORTRAN_PARSER_CHAR_BUFFER_H_
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