public bool TryParse(PrioritizedString expr, ParameterInfo paramInfo, out Expression parsed)
{
expr = expr.Trim();
var exprStr = expr.Input;
if (!Brackets.AreMatching(exprStr.First(), exprStr.Last()))
{
parsed = null;
return(false);
}
var exprWithoutBrackets = expr.Substring(1, expr.Input.Length - 2);
parsed = Combinator.ParseFunctionalExpression(exprWithoutBrackets, paramInfo);
return(true);
}
public bool TryParse(PrioritizedString expr, ParameterInfo paramInfo, out Expression parsed)
{
expr = expr.Trim();
bool isUnaryPlus;
if (expr.Input.StartsWith("+"))
{
isUnaryPlus = true;
}
else if (expr.Input.StartsWith("-"))
{
isUnaryPlus = false;
}
else
{
parsed = default;
return(false);
}
var arg = expr.Substring(1, expr.Length - 1).Trim();
if (arg.Length == 0)
{
throw new ParseException("Found plus sign without argument");
}
if (arg.Input[0] == '-' || arg.Input[0] == '+')
{
throw new ParseException("Unary minus/plus cannot be followed by unary minus/plus");
}
parsed = isUnaryPlus
? Combinator.Parse(arg, paramInfo, Order)
: Expression.Negate(Combinator.Parse(arg, paramInfo, Order));
return(true);
}
