public void ParseSingleVariable()
{
var input = "x";
var result = new KeyCountCollection<string>();
result.Add(input);
Assert.IsTrue(result.Any());
Assert.AreEqual(result.First().Value, 1);
}
/// <summary>
/// Преобразование входного уравнения к нормальному виду
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public string NormalizeExpression(string input)
{
var sides = PrepareStringForNormalizing(input).Split('=');
var result = new KeyCountCollection<KeyCountCollection<string>>();
ParseSummand(sides[0].Split('+'), result, false);
ParseSummand(sides[1].Split('+'), result, true);
return _expressionFormatter.GetExpression(result);
}
public void ParseVariablesWithRepeatlyVariables()
{
var input = "x*x*y";
var result = new KeyCountCollection<string>();
var parser = new VariablesParser();
var multipliers = parser.GetVariables(input);
result.AddRange(multipliers);
Assert.IsTrue(result.Count() == 2);
Assert.AreEqual(result.First(x => x.Key == "x").Value, 2);
}
/// <summary>
/// Обработка слогаемых
/// </summary>
/// <param name="summands">Слогаемые</param>
/// <param name="result">Выходная коллекция</param>
/// <param name="inverse">Инвертировать ли слогаемые?</param>
private void ParseSummand(IEnumerable<string> summands, KeyCountCollection<KeyCountCollection<string>> result, bool inverse)
{
foreach (var summand in summands)
{
var coefficient = _coefficientParser.GetСoefficient(summand);
if (inverse)
{
coefficient *= -1;
}
var variableCollection = new KeyCountCollection<string>();
variableCollection.AddRange(_variablesParser.GetVariables(summand));
result.Add(variableCollection, coefficient);
}
}
public string GetExpression(KeyCountCollection<KeyCountCollection<string>> summands)
{
var resultBuilder = new StringBuilder();
foreach (var summand in summands)
{
resultBuilder
.Append(GetSign(summand))
.Append(summand.Value)
.Append("*");
foreach (var variable in summand.Key)
{
resultBuilder.Append(variable.Key);
FormatExponenta(variable, resultBuilder);
resultBuilder.Append("*");
}
resultBuilder.Length--;
}
TrimFirstPlus(resultBuilder);
resultBuilder.Append("= 0");
return resultBuilder.ToString();
}
