private string evalSub(StructToken token, int subIndex)
{
TreeToken subToken = token.SubTokens[subIndex];
int precedence = OperatorProperties.GetPrecedence(token);
bool brackets = precedence > OperatorProperties.GetPrecedence(subToken);
string expr = subToken.Evaluate(this);
if (brackets)
{
expr = $"<mo>(</mo>{expr}<mo>)</mo>";
}
return(expr);
}
private static void createTreeNode(Stack <Token> stack, StructToken token)
{
if (token is SignOperatorToken signToken)
{
if (stack.Count < 1)
{
throw new ParserSyntaxException(token.Position);
}
signToken.SubTokens[1] = (TreeToken)stack.Pop();
signToken.SubTokens[0] = new NumberToken("0", signToken.Position);
stack.Push(signToken);
}
else if (token is OperatorToken opToken)
{
if (stack.Count < 2)
{
throw new ParserSyntaxException(token.Position);
}
opToken.SubTokens[1] = (TreeToken)stack.Pop();
opToken.SubTokens[0] = (TreeToken)stack.Pop();
stack.Push(opToken);
}
else if (token is FuncToken funcToken)
{
if (stack.Count < 1)
{
throw new ParserSyntaxException(token.Position);
}
var paramToken = stack.Pop() as FuncParamToken;
if (paramToken == null)
{
throw new ParserSyntaxException(token.Position);
}
if (funcToken.ArgCount != -1 && paramToken.ParamList.Count != funcToken.ArgCount)
{
throw new ParserFunctionArgumentException(funcToken.Symbol, token.Position, paramToken.ParamList.Count);
}
int i = 0;
foreach (var subTokenList in paramToken.ParamList)
{
funcToken.SubTokens.Add(CreateTree(subTokenList));
i++;
}
stack.Push(funcToken);
}
}
