#ifndef ASTXI_H
#define ASTXI_H
/*
 astxi.h

 Script Language Development Kit
 Execute from Abstract Syntax Tree

 Copyright (c) 1996-2002 Parsifal Software.
 All Rights Reserved.

 For further information about this program or the AnaGram
 parser generator, please contact:

    Parsifal Software
    http://www.parsifalsoft.com
    info@parsifalsoft.com
    +1-800-879-2577, Voice/Fax +1-508-358-2564
    P.O. Box 219
    Wayland, MA 01778
    USA
*/

#include "astdefs.h"

class Interpreter {
  AbstractSyntaxTree tree;
  Dataset &dataset;
  Value returnValue;

  // Enumeration to specify outcome of the execute function
  enum Outcome {
    normal,                             // execution terminated normally
    breakEncountered,                   // a break statement was encountered
    continueEncountered,                // a continue statement was encountered
    returnEncountered                   // a return statement was encountered
  };
  Value evaluate(const AstNode *node);
  Outcome execute(const AstNode *node);
  void updateDictionary(const AstNode *node);
public:
  Interpreter(const char *text, Dataset &d)
      : tree(buildTree(text)), dataset(d), returnValue() {}
  ~Interpreter() {}
  Value execute();
};

#endif