C:/Documents and Settings/jegan/Desktop/projectX/List.h

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#ifndef LIST_H
#define LIST_H

#include <string>

class List;
class Atom;

class ListItem {
public:
        virtual bool atomic()=0;
        virtual std::string getString()=0;
        virtual int getInt()=0;
        virtual double getDouble()=0;
        virtual List *getList()=0;
        virtual std::string firstString()=0;
        virtual List *firstList()=0;
        virtual void findAndReplace(std::string find, std::string replace)=0;
private:
};

class List : public ListItem {
public:
        List(int lineNumber = -1);
        List(List *list);
        ~List();
        bool atomic() {return false;}
        
        ListItem *first();
        List *rest();
        
        std::string getString();
        int getInt();
        double getDouble();

    std::string getRestString();
        
        List* copy();

        List *cons(ListItem *first);
        List *snoc(ListItem *last);
    
        void findAndReplace(std::string find, std::string replace);

        bool empty() {return (!_item);}
        
        List *getList() {return this;}
        
        std::string firstString();
        int firstInt();
        double firstDouble();
        
        List *firstList();
protected:
//      std::list<ListItem*> _list;
        ListItem *_item;
        List *_next;
        int _lineNumber;
};

class Atom : public ListItem {
public:
        Atom(std::string aString, int lineNumber = -1);
        Atom(int anInt, int lineNumber = -1);
        Atom(double aDouble, int lineNumber = -1);
        Atom(Atom *atom);

        bool atomic() {return true;}
        std::string getString() {return _string;}
        int getInt();
        double getDouble();
        List *getList();
        std::string firstString();
        List *firstList();

        void findAndReplace(std::string find, std::string replace);
protected:
        std::string _string;
        int _lineNumber;
};

#endif

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