stl_scanner.h

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// === stl_scanner.h ===================================================================================================
//                                               Sen Infrastructure
//                   Released under the Apache License v2.0 (SPDX-License-Identifier Apache-2.0).
//                                    See the LICENSE.txt file for more information.
//                   © Airbus SAS, Airbus Helicopters, and Airbus Defence and Space SAU/GmbH/SAS.
// =====================================================================================================================
 
#ifndef SEN_CORE_LANG_STL_SCANNER_H
#define SEN_CORE_LANG_STL_SCANNER_H
 
#include "sen/core/base/class_helpers.h"
#include "sen/core/lang/code_location.h"
#include "sen/core/lang/stl_token.h"
 
// std
#include <string>
 
namespace sen
{
struct Var;
}
 
namespace sen::lang
{


class StlScanner
{
  SEN_NOCOPY_NOMOVE(StlScanner)
 
public:
  explicit StlScanner(const std::string& program);
  ~StlScanner() = default;
 
public:
  [[nodiscard]] const StlTokenList& scanTokens();
 
private:
  enum class Sign
  {
    positive,
    negative
  };
 
private:
  void scanToken();
  void addToken(StlTokenType type, const Var& value);
  void error(const std::string& message) const;
  void string(char endingChar);
  void comment();
  void ruler();
  void number(Sign sign);
  void identifier();
 
private:  // utility
  [[nodiscard]] bool isAtEnd() const;
  [[nodiscard]] char advance();
  [[nodiscard]] bool match(char expected);
  [[nodiscard]] char peek() const;
  [[nodiscard]] char peekNext() const;
  [[nodiscard]] StlToken identifierToken() const;
  [[nodiscard]] static std::string formatNumber(const std::string& lexeme);
 
private:
  const std::string& program_;
  StlTokenList tokens_;
  std::size_t start_ = 0U;
  CodeLocation current_;
};

 
}  // namespace sen::lang
 
#endif  // SEN_CORE_LANG_STL_SCANNER_H