/Users/paul/Documents/phlogo/core/StringTokenStream.h

/*
 *  StringTokenStream.h
 *
 *  Author: Paul Hamilton
 *      Date: 28 Jul 2011
 *
 */
#ifndef _STRINGTOKENSTREAM_H
#define _STRINGTOKENSTREAM_H

#include "TokenStream.h"

namespace phlogo {

class StringTokenStream : public TokenStream {
                
public:
        StringTokenStream(const std::string &input) : 
                _input(input), _begin(0), _subend(0), _end(input.length()), _next(0) {}

        // TokenStream overrides
        virtual bool withinSubExpression() { return _subend != 0; }
        virtual bool hasMoreSubExpression() { return _next != _subend; }
        virtual bool atEnd() { return _next == _end; }
        virtual size_t findEndSubExpression();
        virtual void finishSubExpression(size_t pos) { _next = pos; _subend = 0; }

        std::string nextWord();
        void skipWs();
        bool hasMore() { return _next != std::string::npos && _next < _end; }
        void forward(size_t offs) { _next += offs; }
        char nextChar() { return _input[_next]; }
        std::string remain() { return _input.substr(_next); };
        char charAt(size_t pos) { return _input[pos]; };
        
private:
        std::string _input;
        size_t _begin; 
        size_t _subend;
        size_t _end;
        size_t _next;
};

}

#endif // _STRINGTOKENSTREAM_H