bool CompareLetters(Node aNode, Node bNode)
{
HashSet <string> aLetters = new HashSet <string>(aNode.GetDict().Keys);
HashSet <string> bLetters = new HashSet <string>(bNode.GetDict().Keys);
return(aLetters.SetEquals(bLetters));
}
public Polynom(string expression, bool calculatingPowers = true)
{
string[] unprocessedNodes = Regex.Split(Regex.Replace(expression, @"(?<=[0-9a-zA-Z]+)([\+-])", " $1"), @"(?<=[0-9a-zA-Z]+)\s+(?=[\+-])").Select(x => x.Trim()).ToArray();
unprocessedNodes = unprocessedNodes.Select(x => Regex.Replace(x, @"\s+", "")).ToArray();
Regex regex = new Regex(@"([\+-]?\d*\.?\d*)\*?([a-zA-Z]?)\^?([\+-]?\d*)");
foreach (string node in unprocessedNodes)
{
Node temp = new Node();
MatchCollection matches = regex.Matches(node);
for (int i = 0; i < matches.Count - 1; i++)
{
Match match = matches[i];
if (match.Groups[1].Value == "" && match.Groups[2].Value == "" || unprocessedNodes.Any(x => x == ""))
{
MessageBox.Show("Parse error");
break;
}
double tempK = (match.Groups[1].Value == "" || match.Groups[1].Value == "+")
? 1
: (match.Groups[1].Value == "-"
? -1
: StringToDouble(match.Groups[1].Value));
int tempPower = match.Groups[3].Value == ""
? (match.Groups[2].Value == ""
? 1
: (match.Groups[2].Value == "-"
? -1
: 1))
: StringToInt(match.Groups[3].Value);
string tempLetter = match.Groups[2].Value;
if (match.Groups[2].Value != "" && match.Groups[3].Value == "0")
{
if (temp.GetDict().Count > 0)
{
continue;
}
tempLetter = "";
tempPower = 0;
}
if (calculatingPowers && match.Groups[2].Value == "")
{
tempK = Math.Sign(tempK) * Math.Pow(Math.Abs(tempK), tempPower);
tempPower = 0;
}
if (temp.GetDict().Count == 0)
{
temp = new Node(tempK, tempPower, tempLetter);
}
else
{
if (temp.GetDict().Count == 1 && temp.GetDict().ContainsKey("") && temp.GetDict()[""] == 0)
{
temp.GetDict().Remove("");
}
temp.GetDict()[tempLetter] = tempPower;
}
}
Add(temp);
}
}
int ComparePowers(Node aNode, Node bNode)
{
return(aNode.GetDict().Values.Sum() - bNode.GetDict().Values.Sum());
}
bool CompareSets(Node aNode, Node bNode)
{
return(CompareLetters(aNode, bNode) &&
aNode.GetDict().Keys.All(x => aNode.GetPower(x) == bNode.GetPower(x)));
}