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

/*
 *  StringTokenStream.cpp
 *
 *  Author: Paul Hamilton
 *      Date: 28 Jul 2011
 *
 */
#include "StringTokenStream.h"

#include "Verbs.h"

using namespace std;

namespace phlogo {

string StringTokenStream::nextWord() {
        size_t start = _next;
        size_t nexti = _input.find(' ', start);
        if (nexti == string::npos) {
                _next = _end;
                return _input.substr(start);
        }       
        _next = Verbs::safeNext(nexti, _end);
        return _input.substr(start, nexti-start);
}

void StringTokenStream::skipWs() {

        for (size_t i=_next; i<_end; i++)
                if (_input[i] != ' ') {
                        _next = i;
                        return;
                }
        _next = _end;
                
}

size_t StringTokenStream::findEndSubExpression() {
        int paren = 1;
        size_t i = _next;
        i += 2;
        _next = i;
        while (i != _end && paren != 0) {
                char c = _input[i];
                switch (c) {
                case '(': paren++;
                        break;
                case ')': paren--;
                        break;
                }
                i++;
        }
        // backup 1
        _subend = i-1;
        
        return i;
}

}