term.cpp

term.cpp

#include <vector>
#include <string>
#include <iostream>

#include "term.h"

using std::vector;

using std::string;
using std::stod;

using std::cout;
using std::endl;

vector<Term> parseEquation(string equationString){
    string::size_type location = 0;
    vector<Term> equation;

    while(true){
        Term term;

        term.number = stod(equationString, &location);

        if(location <= equationString.size()){
            term.operation = equationString[location];
        }else{
            term.operation = '\0';
        }

        equation.push_back(term);

        if(term.operation == '\0'){
            return equation;
        }else{
            equationString = equationString.substr(location + 1);
        }
    }

}

void simplifyEquation(vector<Term> &equation){
    auto originalSize = equation.size();

    simplifyEquation(equation, '*'); if(equation.size() != originalSize) return;
    simplifyEquation(equation, '/'); if(equation.size() != originalSize) return;
    simplifyEquation(equation, '+'); if(equation.size() != originalSize) return;
    simplifyEquation(equation, '-'); if(equation.size() != originalSize) return;
}

void simplifyEquation(vector<Term> &equation, const char &operation){
    vector<Term> result;

    for(auto i=equation.begin();i != equation.end();i++){
        if(i->operation == operation){
            Term currentTerm = *i;
            Term nextTerm = *(++i);
            Term newTerm;

            if(operation == '+'){
                newTerm.number = currentTerm.number + nextTerm.number;
            }else if(operation == '-'){
                newTerm.number = currentTerm.number - nextTerm.number;
            }else if(operation == '*'){
                newTerm.number = currentTerm.number * nextTerm.number;
            }else if(operation == '/'){
                newTerm.number = currentTerm.number / nextTerm.number;
            }

            newTerm.operation = nextTerm.operation;

            result.push_back(newTerm);
        }else{
            result.push_back(*i);
        }
    }

    equation = result;
}

void printEquation(const vector<Term> &equation){
    for(const Term &term : equation){
        cout << term.number;

        if(term.operation == '\0'){
            return;
        }else{
            cout << term.operation;
        }
    }
}