scanner.h

Go to the documentation of this file.

#pragma once
 
#include <string>
#include "core/pos2d.h"
#include "core/buffer.h"
 
namespace teditor {
namespace parser {
 
class Scanner {
 public:
  virtual ~Scanner() {}
  virtual char next(Point& pt) = 0;
  virtual bool isEof() const = 0;
  virtual void rewind() = 0;
  virtual std::string at(const Point& begin, const Point& end) = 0;
};  // class Scanner
 
 
class StringScanner : public Scanner {
 public:
  StringScanner(const std::string& s): str(s), currPos(0), startPos(0) {}
  char next(Point& pt) override;
  bool isEof() const override { return currPos >= str.size(); }
  void rewind() override;
  std::string at(const Point& begin, const Point& end) override;
 
 private:
  std::string str;
  size_t currPos;
  size_t startPos;
};  // class StringScanner
 
 
class BufferScanner : public Scanner {
 public:
  BufferScanner(Buffer& b);
  char next(Point& pt) override;
  bool isEof() const override { return end == buf.getPoint(); }
  void rewind() override { buf.left(); }
  std::string at(const Point& begin, const Point& end) override;
 
 private:
  Buffer& buf;
  Point currPos, end;
};  // class BufferScanner
 
}  // namespace parser
}  // namespace teditor