/// <summary>
/// Parses the day expression.
/// Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday
/// </summary>
/// <returns></returns>
public Expr ParseFunction(ParameterExpr expr)
{
_tokenIt.ExpectIdText(this.Name);
var expectParens = _tokenIt.NextToken.Token == Tokens.LeftParenthesis;
FluentHelper.ParseFuncParameters(expr.ParamListExpressions, _tokenIt, _parser, expectParens, true, _funcMeta);
return(expr);
}
/// <summary>
/// Visits the function call expression tree
/// </summary>
/// <param name="exp"></param>
public object VisitParameter(ParameterExpr exp)
{
return(null);
}
public Expr Parameter(ParameterExpr parameter)
{
if(!HasParameter) {
parameterName = parameter.ParameterName;
autoParameterName = true;
}
if(parameterName == parameter.ParameterName) {
return Expr.One;
} else {
if(autoParameterName)
throw new ExpressionDefferentiationException("Expression contains more than one independent variable");
return Expr.Zero;
}
}
/// <summary>
/// Visit the parameter expr.
/// </summary>
/// <param name="expr"></param>
/// <returns></returns>
public object VisitParameter(ParameterExpr expr)
{
return(LObjects.Null);
}
public Number Parameter(ParameterExpr parameter)
{
var parameterValue = Context.GetValue(parameter.ParameterName);
if(parameterValue == null)
throw new ExpressionEvaluationException(string.Format("{0} value is undefined", parameter.ParameterName));
return parameterValue.Visit(this);
}
