// File: parse.h
//
// Function prototypes for parser

#ifndef _parse_h
#define _parse_h

#include "tree.h"
#include "token.h"


typedef Tree<Token> ETree ;


// Exception handling class.
// Catch objects of the following type for parsing errors
//
class ParseError {
public:
   const char *msg ;    // point to static string only, please
   ParseError(const char *s = NULL) : msg(s) {}
} ;


int Evaluate(const ETree&) ;            // evaluate the expression tree
ETree *Parse(TokenStream&) ;            // catches exceptions
ETree *ParseEverything(TokenStream&) ;  // catch your own exceptions

#endif