#include <iostream>
#include <string>
#include <map>
#include <vector>
#include"VariableMap.h"
#include <cctype>
/**
 *Variable Map is a class to store the variables used throughout the program.
 *The values are stored as Node *s, this way they are not affected by changes to
 *other variables. They are stored as a vector, so that later implementations
 *might allow for looking up old values.
 *
 *Written by Jessica Smith
 */
VariableMap::VariableMap()
{
    
}
Node * VariableMap::lookUpVar(const string & variable)
{
    //vairable must be of Node type VARIABLE
    //if there prints out value else 0
    
    vector<Node *> values;
    values= myVariables[variable];
    if(values.size()!=0)
    {
        return(values[values.size()-1]);
    }
    else
    {
        return (new Variable(variable,0));
    }
   
}
void VariableMap::upDateVariables(const string & variable,  Node * & value)
{
    //updates the value and prints out the value of the variable
     myVariables[variable].push_back(value);
     cout<<value->evaluate()<<endl;;
     
}
bool VariableMap::checkForVar(const string & line,const int &k)
{
    //Checks thorugh map to see if line is in the map returns true if it is
    //False otherwise
    string var;
    int counter=k;
    while(counter<line.length()&&isalpha(line[counter]))
    {
        var+=line[counter];
        counter++;
    }
    for(VariableList::const_iterator iter=myVariables.begin();iter!=myVariables.end();iter++)
    {
        VariablePair varPair=*iter;
        if(varPair.first==var)
        {
            return true;
        }
        
    }
    return false;
}