#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <sstream>
#include <string>

#include "exception.h"
#include "parse.h"

using namespace JFK;
using std::string;

string 
JFK::argument(int index, const string& objstring)
// Returns index-th argument of any object string
// arguments look like x=0.5343 etc... 
{
    int spacecount = 0;
    int start = 0;
    int fin;

    // Get start/final position of index-th substing
    for (fin = 0; fin < objstring.length() && spacecount <= index; fin++)
    {
        if (objstring[fin] == ' ')
        {
            // Two spaces != two sep. spaces
            if (fin!=0 && objstring[fin - 1] != ' ')
                spacecount++;

            if (spacecount <= index)
                start = fin + 1; // One after Space
            else
                fin--;
        }
    }
    
    if (spacecount < index || start >= fin)
        return ""; // Argument not available
    else
        return objstring.substr(start, fin - start);
}

string 
JFK::identifier(const string& arg)
{
    // Identifier : substring before "=" or complete string if no "="
    return arg.substr(0, arg.find("="));
}

string 
JFK::value(const string& arg)
{
    // Value : substring after "=" or nothing if no "="
    if(arg.find("=") >= arg.length())
        return "";
    else
        return arg.substr(arg.find("=") + 1);
}

double
JFK::strtodbl(const string& s)
{
    std::istringstream i(s);
    double x;
    if (i >> x)
        return x;
    else
        throw JFK::exception(s + " not a value");
}

int
JFK::strtoint(const string& s)
{
    std::istringstream i(s);
    int x;
    if (i >> x)
        return x;
    else
        throw JFK::exception(s + " not a value");
}