public MathEquation(string line, HomeworkType type = HomeworkType.Simple)
{
//< Retain the source equation and the HomeWorktype (simple -> no precedence / advanced -> addition first)
this.Source = line;
this.Type = type;
//< Simplify the equation based on the specified HomeworkType
this.Simplified = Simplify(Source, Type);
//< Get the result based on the specific HomeworkType
this.Result = (Type == HomeworkType.Simple) ? SimpleSolve(Simplified) : PrecedenceSolve(Simplified);
}
public static string Simplify(string line, HomeworkType type)
{
var simplified = new StringBuilder();
var openIdx = new List <int>();
foreach (char c in line)
{
switch (c)
{
case '(':
//< Add the leading bracket to 'simplified' string
simplified.Append(c);
//< Add the index of the bracket to the index list
openIdx.Add(simplified.Length);
break;
case ')':
//< Get the index of the last open bracket
int lastIdx = openIdx.Last();
//< Get the current sub-equation to solve (substring starting at last open bracket's index)
var eqn = simplified.ToString().Substring(lastIdx);
//< Get the result of that equation
var result = (type == HomeworkType.Simple) ? SimpleSolve(eqn) : PrecedenceSolve(eqn);
//< Replace the current un-solved sub-equation with its result
simplified.Remove(lastIdx - 1, simplified.Length - (lastIdx - 1));
simplified.Append(result);
//< Remove the index to the 'solved' open bracket (the last one)
openIdx.RemoveAt(openIdx.Count - 1);
break;
default:
simplified.Append(c); //< Not a parentheses, simply add to the 'simplified' string
break;
}
}
return(simplified.ToString());
}
public MathHomework(IEnumerable <string> input, HomeworkType type = HomeworkType.Simple)
{
this.Equations = input.Select(x => new MathEquation(x, type)).ToList();
}
