public Expression(List <Token> polishNotationTokens, ExpressionParser <T> expressionParser, string expression)
{
parser = expressionParser;
originalExpression = expression;
rootNode = CreateTree(polishNotationTokens);
}
public void Setup()
{
parser = new ExpressionParser <float>();
// Plus Symbol
ExpressionParser <float> .Symbol plusSymbol = new ExpressionParser <float> .Symbol();
plusSymbol.Name = "+";
plusSymbol.Type = SymbolType.Operator;
plusSymbol.Precedence = 1;
plusSymbol.RegexOverride = "\\+";
plusSymbol.binaryFunc = (left, right) => left + right;
parser.WithSymbol(plusSymbol);
// Minus Symbol
ExpressionParser <float> .Symbol minusSymbol = new ExpressionParser <float> .Symbol();
minusSymbol.Name = "-";
minusSymbol.Type = SymbolType.Operator;
minusSymbol.Precedence = 2;
minusSymbol.RegexOverride = "\\-";
minusSymbol.unaryFunc = (val) => - val;
minusSymbol.binaryFunc = (left, right) => left - right;
parser.WithSymbol(minusSymbol);
// Multiply Symbol
ExpressionParser <float> .Symbol multSymbol = new ExpressionParser <float> .Symbol();
multSymbol.Name = "*";
multSymbol.Type = SymbolType.Operator;
multSymbol.Precedence = 3;
multSymbol.RegexOverride = "\\*";
multSymbol.binaryFunc = (left, right) => left * right;
parser.WithSymbol(multSymbol);
// Divide Symbol
ExpressionParser <float> .Symbol divideSymbol = new ExpressionParser <float> .Symbol();
divideSymbol.Name = "/";
divideSymbol.Type = SymbolType.Operator;
divideSymbol.Precedence = 4;
divideSymbol.RegexOverride = "\\/";
divideSymbol.binaryFunc = (left, right) => left / right;
parser.WithSymbol(divideSymbol);
// Open Parenthesis
ExpressionParser <float> .Symbol openParenthesis = new ExpressionParser <float> .Symbol();
openParenthesis.Name = "(";
openParenthesis.Type = SymbolType.OpenParenthesis;
openParenthesis.RegexOverride = "\\(";
parser.WithSymbol(openParenthesis);
// Close Parenthesis
ExpressionParser <float> .Symbol closeParenthesis = new ExpressionParser <float> .Symbol();
closeParenthesis.Name = ")";
closeParenthesis.Type = SymbolType.CloseParenthesis;
closeParenthesis.RegexOverride = "\\)";
parser.WithSymbol(closeParenthesis);
// Interpret literals.
parser.LiteralParser = (val) => float.Parse(val);
}
