source/modules/ysfx/sources/ysfx_reader.hpp

   1 // Copyright 2021 Jean Pierre Cimalando
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14 //
  15 // SPDX-License-Identifier: Apache-2.0
  16 //
  17
  18 #pragma once
  19 #include <string>
  20 #include <cstdio>
  21 #include <cstddef>
  22
  23 namespace ysfx {
  24
  25 class text_reader
  26 {
  27 public:
  28     virtual ~text_reader() = default;
  29     virtual char read_next_char() = 0;
  30     virtual char peek_next_char() = 0;
  31     bool read_next_line(std::string &line);
  32 };
  33
  34 //------------------------------------------------------------------------------
  35 class string_text_reader : public text_reader
  36 {
  37 public:
  38     explicit string_text_reader(const char *text) : m_char_ptr(text) {}
  39     char read_next_char() override;
  40     char peek_next_char() override;
  41 private:
  42     const char *m_char_ptr = nullptr;
  43 };
  44
  45 //------------------------------------------------------------------------------
  46 class stdio_text_reader : public text_reader
  47 {
  48 public:
  49     explicit stdio_text_reader(FILE *stream) : m_stream(stream) {}
  50     char read_next_char() override;
  51     char peek_next_char() override;
  52 private:
  53     FILE *m_stream = nullptr;
  54 };
  55
  56 } // namespace ysfx