static string SeperateAndSimplify(string input)
{
if (input.Contains("("))
{
//we still have parenthesis - this regex will find multiple matches but we only need deal with the first because reciprocity
Regex rgx = new Regex(@"\((?>\((?<c>)|[^()]+|\)(?<-c>))*(?(c)(?!))\)", RegexOptions.Compiled);
Match m = rgx.Match(input);
if (m.Success)
{
var sc = new SubCalc() { StartPos = m.Index, EndPos = (m.Index + m.Length), SubCalcText = m.Value.Substring(1, m.Value.Length - 2) };
if (sc.SubCalcText.Contains("("))
{
//we have a nest, process again
sc.SubCalcText = SeperateAndSimplify(sc.SubCalcText);
input = Rebuild(input, sc);
}
else
{
input = Rebuild(input, sc);
}
}
}
//we check again to contend with nesting..
if (input.Contains("("))
{
input = SeperateAndSimplify(input);
}
return input;
}
static string SeperateAndSimplify(string input)
{
if (input.Contains("("))
{
//we still have parenthesis
Regex rgx = new Regex(@"\((?>\((?<c>)|[^()]+|\)(?<-c>))*(?(c)(?!))\)", RegexOptions.Compiled);
Match m = rgx.Match(input);
if (m.Success)
{
var sc = new SubCalc()
{
StartPos = m.Index, EndPos = (m.Index + m.Length), SubCalcText = m.Value.Substring(1, m.Value.Length - 2)
};
if (sc.SubCalcText.Contains("("))
{
//we have a nest, process again
sc.SubCalcText = SeperateAndSimplify(sc.SubCalcText);
input = Rebuild(input, sc);
}
else
{
input = Rebuild(input, sc);
}
}
}
if (input.Contains("("))
{
input = SeperateAndSimplify(input);
}
return(input);
}
public static string Simplify(string input)
{
CalcText = input;
while (CalcText.Contains("("))
{
GetPositions();
var _l = LPosList.OrderByDescending(x => x).ElementAt(0);
var _r = RPosList.OrderBy(x => x).ElementAt(0);
var sc = new SubCalc()
{
StartPos = _l, EndPos = _r, SubCalcText = CalcText.Substring(_l + 1, ((_r - _l) - 1))
};
CalcText = CalcText.Substring(0, sc.StartPos) + sc.Result + CalcText.Substring(sc.EndPos + 1, (CalcText.Length - 1) - sc.EndPos);
}
return(CalcText);
}
static string Rebuild(string input, SubCalc sc)
{
return(input.Substring(0, sc.StartPos) + sc.Result + input.Substring(sc.EndPos));
}