public void Parse(RawExpression rawExpression)
{
RawExpressionParser parser = new RawExpressionParser(rawExpression);
IEnumerable <RawMultiplier> rawMultipliers = parser.Iterator();
foreach (RawMultiplier rawMultiplier in rawMultipliers)
{
Multiplier multiplier = new Multiplier(rawMultiplier);
Expression expression = multiplier.ConvertToExpression();
this.Join(expression);
}
}
/**
* Main magic is happening here
*/
public string Normalize(string equation)
{
string[] parts = equation.Split(new char[] { '=' });
Expression parsedEquation;
Multiplier rightPart;
if (parts.Length != 2)
{
return("Equation is incorrect, it should have two parts and equal sign");
}
string leftPartRaw = parts[0]; // get left part
string rightPartRaw = "(" + parts[1] + ")"; // and right part
int rightOffset = equation.IndexOf('=') + 1;
try
{
// parse left part as an Expression
parsedEquation = new Expression(new RawExpression(0, leftPartRaw));
}
catch (ParseException e)
{
// parse right part as Multiplier as we want eventually multiply it to -1
return(this.HandleException(equation, e));
}
try
{
rightPart = new Multiplier(new RawMultiplier(rightOffset, rightPartRaw, -1));
}
catch (ParseException e)
{
return(this.HandleException(equation, e));
}
// If I wrote it in Python I would very likely use PyParser package which make life
// a way easier for parsing expressions like this, but I decided to go hardcore
// and write it on C# for which breaf search didn't get result of analogues of
// PyParse in .NET world. So I simply wrote my own parsers
// then join left part expression and converted multiplier to expression
parsedEquation.Join(rightPart.ConvertToExpression());
// do sorting
List <Summand> sortedSummands = this.Sort(parsedEquation.summands);
return(this.GenerateEquationString(sortedSummands));
}
