protected virtual object EvalStringLiteral(ParseTree tree, params object[] paramlist)
{
throw new NotImplementedException();
}
protected virtual object EvalVariable(ParseTree tree, params object[] paramlist)
{
throw new NotImplementedException();
}
protected virtual object EvalAssignmentExpression(ParseTree tree, params object[] paramlist)
{
throw new NotImplementedException();
}
protected virtual object EvalMultiplicativeExpression(ParseTree tree, params object[] paramlist)
{
throw new NotImplementedException();
}
protected virtual object EvalStart(ParseTree tree, params object[] paramlist)
{
return("Could not interpret input; no semantics implemented.");
}
/// <summary>
/// this implements the evaluation functionality, cannot be used directly
/// </summary>
/// <param name="tree">the parsetree itself</param>
/// <param name="paramlist">optional input parameters</param>
/// <returns>a partial result of the evaluation</returns>
internal object Eval(ParseTree tree, params object[] paramlist)
{
object Value = null;
switch (Token.Type)
{
case TokenType.Start:
Value = EvalStart(tree, paramlist);
break;
case TokenType.Function:
Value = EvalFunction(tree, paramlist);
break;
case TokenType.PrimaryExpression:
Value = EvalPrimaryExpression(tree, paramlist);
break;
case TokenType.ParenthesizedExpression:
Value = EvalParenthesizedExpression(tree, paramlist);
break;
case TokenType.UnaryExpression:
Value = EvalUnaryExpression(tree, paramlist);
break;
case TokenType.PowerExpression:
Value = EvalPowerExpression(tree, paramlist);
break;
case TokenType.MultiplicativeExpression:
Value = EvalMultiplicativeExpression(tree, paramlist);
break;
case TokenType.AdditiveExpression:
Value = EvalAdditiveExpression(tree, paramlist);
break;
case TokenType.ConcatEpression:
Value = EvalConcatEpression(tree, paramlist);
break;
case TokenType.RelationalExpression:
Value = EvalRelationalExpression(tree, paramlist);
break;
case TokenType.EqualityExpression:
Value = EvalEqualityExpression(tree, paramlist);
break;
case TokenType.ConditionalAndExpression:
Value = EvalConditionalAndExpression(tree, paramlist);
break;
case TokenType.ConditionalOrExpression:
Value = EvalConditionalOrExpression(tree, paramlist);
break;
case TokenType.AssignmentExpression:
Value = EvalAssignmentExpression(tree, paramlist);
break;
case TokenType.Expression:
Value = EvalExpression(tree, paramlist);
break;
case TokenType.Params:
Value = EvalParams(tree, paramlist);
break;
case TokenType.Literal:
Value = EvalLiteral(tree, paramlist);
break;
case TokenType.IntegerLiteral:
Value = EvalIntegerLiteral(tree, paramlist);
break;
case TokenType.RealLiteral:
Value = EvalRealLiteral(tree, paramlist);
break;
case TokenType.StringLiteral:
Value = EvalStringLiteral(tree, paramlist);
break;
case TokenType.Variable:
Value = EvalVariable(tree, paramlist);
break;
default:
Value = Token.Text;
break;
}
return(Value);
}
protected object GetValue(ParseTree tree, TokenType type, int index)
{
return(GetValue(tree, type, ref index));
}