ginac/parser/lexer.hpp

   1 #ifndef GINAC_LEXER_HPP_
   2 #define GINAC_LEXER_HPP_
   3 #include <iosfwd>
   4 #include <string>
   5 #include <cstddef>
   6 namespace GiNaC
   7 {
   8
   9 class lexer
  10 {
  11         std::istream* input;
  12         std::ostream* output;
  13         std::ostream* error;
  14         /// last character read from stream
  15         int c;
  16         /// identifier and number tokens are stored here
  17         std::string str;
  18         std::size_t line_num;
  19         std::size_t column;
  20         friend class parser;
  21 public:
  22
  23         lexer(std::istream* in = 0, std::ostream* out = 0, std::ostream* err = 0);
  24         ~lexer();
  25
  26         int gettok();
  27         void switch_input(std::istream* in);
  28
  29         struct token_type
  30         {
  31                 enum
  32                 {
  33                         eof             = -1,
  34                         identifier      = -4,
  35                         number          = -5,
  36                         literal         = -6
  37
  38                 };
  39         };
  40 };
  41
  42 } // namespace GiNaC
  43
  44 #endif // GINAC_LEXER_HPP_
  45