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lexer.h

Go to the documentation of this file.

#ifndef lexer_h
#define lexer_h

#include "file.h"
#include "error.h"


class Lexer
{
 private:
  File in;
  File out;

  bool eof_reached;
  
  int line_number;
  int cursor_pos;

  std::string current_dir;

 public:
  Lexer( File in, File out, std::string current_dir = "");

  void lex(); 

  class Error; 

  class cannot_open_file; 

  class cannot_create_file; 

 private:
  std::string read_line();   

  std::string::size_type find_tag( std::string line, std::string::size_type startpos );

  std::string::size_type find_end_of_tag( std::string line, std::string::size_type startpos );

  std::string get_tag( std::string line, std::string::size_type startpos );
};

class Lexer::Error : public :: Error
{
 public:
  template <class T>Error( std::string error_string, T what )
    : ::Error( Line(), "Lexer", error_string, what )
    {}
};

class Lexer::cannot_open_file : public Lexer::Error
{
 public:
  template <class T>cannot_open_file( T what )
    : Error( _("cannot open file"), what )
    {}
};

class Lexer::cannot_create_file : public Lexer::Error
{
 public:
  template <class T>cannot_create_file( T what )
    : Error( _("cannot create file"), what )
    {}
};

#endif

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