examples/calc++/calc++-driver.hh

   1 #ifndef CALCXX_DRIVER_HH
   2 # define CALCXX_DRIVER_HH
   3 # include <string>
   4 # include <map>
   5
   6 /// Forward declarations.
   7 union YYSTYPE;
   8
   9 namespace yy
  10 {
  11   class calcxx_parser;
  12   class location;
  13 }
  14
  15 class calcxx_driver;
  16
  17 // Announce to Flex the prototype we want for lexing function, ...
  18 # define YY_DECL                                                \
  19   int yylex (YYSTYPE* yylval, yy::location* yylloc, calcxx_driver& driver)
  20 // ... and declare it for the parser's sake.
  21 YY_DECL;
  22
  23 /// Conducting the whole scanning and parsing of Calc++.
  24 class calcxx_driver
  25 {
  26 public:
  27   calcxx_driver ();
  28   virtual ~calcxx_driver ();
  29
  30   /// The variables.
  31   std::map<std::string, int> variables;
  32
  33   /// \name Handling the scanner.
  34   /// \{
  35   /// Open \a file for scanning.
  36   void scan_begin ();
  37   /// End scanning, clean up memory.
  38   void scan_end ();
  39   /// Whether to enable scanner traces.
  40   bool trace_scanning;
  41   /// \}
  42
  43   /// \name Handling the parser.
  44   /// \{
  45   /// Parse the file \a f.
  46   void parse (const std::string& f);
  47   /// The file being parsed.
  48   std::string file;
  49   /// Whether to enable parsing traces.
  50   bool trace_parsing;
  51   /// \}
  52
  53   /// The result.
  54   int result;
  55
  56   /// \name Error handling.
  57   /// \{
  58   /// Register a located error.
  59   void error (const yy::location& l, const std::string& m);
  60   /// Register an error.
  61   void error (const std::string& m);
  62   /// \}
  63 };
  64 #endif