protected virtual object EvalPair(ParseTree tree, params object[] paramlist)
{
throw new NotImplementedException();
}
protected virtual object EvalCoalesceExpression(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.Expression:
Value = EvalExpression(tree, paramlist);
break;
case TokenType.ConditionalExpression:
Value = EvalConditionalExpression(tree, paramlist);
break;
case TokenType.CoalesceExpression:
Value = EvalCoalesceExpression(tree, paramlist);
break;
case TokenType.OrExpression:
Value = EvalOrExpression(tree, paramlist);
break;
case TokenType.AndExpression:
Value = EvalAndExpression(tree, paramlist);
break;
case TokenType.NotExpression:
Value = EvalNotExpression(tree, paramlist);
break;
case TokenType.Compare:
Value = EvalCompare(tree, paramlist);
break;
case TokenType.Addition:
Value = EvalAddition(tree, paramlist);
break;
case TokenType.Multiplication:
Value = EvalMultiplication(tree, paramlist);
break;
case TokenType.Power:
Value = EvalPower(tree, paramlist);
break;
case TokenType.Negation:
Value = EvalNegation(tree, paramlist);
break;
case TokenType.Member:
Value = EvalMember(tree, paramlist);
break;
case TokenType.MemberAccess:
Value = EvalMemberAccess(tree, paramlist);
break;
case TokenType.IndexAccess:
Value = EvalIndexAccess(tree, paramlist);
break;
case TokenType.Base:
Value = EvalBase(tree, paramlist);
break;
case TokenType.Variable:
Value = EvalVariable(tree, paramlist);
break;
case TokenType.Group:
Value = EvalGroup(tree, paramlist);
break;
case TokenType.FunctionCall:
Value = EvalFunctionCall(tree, paramlist);
break;
case TokenType.ArgumentList:
Value = EvalArgumentList(tree, paramlist);
break;
case TokenType.Literal:
Value = EvalLiteral(tree, paramlist);
break;
case TokenType.ListLiteral:
Value = EvalListLiteral(tree, paramlist);
break;
case TokenType.HashLiteral:
Value = EvalHashLiteral(tree, paramlist);
break;
case TokenType.PairList:
Value = EvalPairList(tree, paramlist);
break;
case TokenType.Pair:
Value = EvalPair(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));
}
public ParseTree Parse(string input)
{
tree = new ParseTree();
return(Parse(input, tree));
}
