public static IList <Element> Parse(string expression)
{
//TODO we may want to chache the expressions for better performance
ParseContext context = new ParseContext(expression);
while (context.TokenPosition < expression.Length)
{
string c = context.Expression.Substring(context.TokenPosition, 1);
if (WhiteSpaceRegExp.IsMatch(c))
{
context.TokenPosition++;
continue;
}
if (ElementGrouping.Parse(context))
{
continue;
}
else if (ElementTernaryOperator.Parse(context))
{
continue;
}
else if (ElementOperator.Parse(context))
{
continue;
}
else if (ElementLiteral.Parse(context))
{
continue;
}
else if (ElementVariable.Parse(context))
{
continue;
}
else if (ElementSelector.Parse(context))
{
continue;
}
else
{
throw new ELException("Invalid character at position" + context.TokenPosition);
}
}
Element.ValidateTokenOrder(context, TokenType.End);
if (context.BpOrder.Count != 0)
{
throw new ELException("Not all parentesis or brakets were closed or ? with out :");
}
while (context.Stack.Count > 0)
{
context.Ouput.Push(context.Stack.Pop());
}
//reverse order
List <Element> result = new List <Element>(context.Ouput);
result.Reverse();
return(result);
}