evalexpr.h

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#ifndef EVALEXPR_INCLUDED
#define EVALEXPR_INCLUDED
 
#include <map>
#include <string>
#include <cstring>
 
#include "evalexpr_parser.h"
#include "evalexpr_symbol.h"
 
#include "IO/bridgeIO.h"
using Bridge::vout;
 
 
class EvalExpr
{
 public:
 
  typedef yy::parser::semantic_type   semantic_type;
  typedef yy::parser::token           token;
 
  EvalExpr(const std::string& line, bool debug = false)
    : m_src(line), m_pos(0), m_result(0),
    m_trace(debug) {}
 
  // lexer
  int next_token(semantic_type& yylval);
 
  // parse
//  bool parse(double& result);
  double parse();
 
  // symbol_table manipulation
  double get_symbol_value(char const *name);
  function_t get_symbol_function(char const *name);
 
  // parser interface
  void set_result(double result);
 
  void error(const std::string& msg);
 
 private:
  const std::string m_src;
  unsigned int m_pos;
  double m_result;
 
  bool m_trace;
 
  static SymbolTable global_symbol_table;
};
 
 
// lexer interface for parser
int yylex(EvalExpr::semantic_type *yylval, EvalExpr& driver);
 
#endif