// Parse and generate a syntax tree
protected void Parse()
{
ExprBuilder exprBuilder = new ExprBuilder();
ExprNode expr = exprBuilder.Build(formula);
formulaExpr = expr;
}
private string Build(string text)
{
var tokeniser = new Parser();
var builder = new ExprBuilder();
var block = builder.Build(tokeniser.Parse(text));
return ExprToString(block);
}
