public override IEnumerable <Token> Parse(string ETLString, TokenFactory tokenFactory)
{
var strs = SplitString(ETLString);
List <Token> retTokens = new List <Token>(strs.Count());
Regex _matcher;
ExpressionType _type;
foreach (string str in strs)
{
try
{
_type = tokenIdentifiers.First(ti =>
{
_matcher = new Regex(ti.Item1, RegexOptions.IgnoreCase);
return(_matcher.IsMatch(str));
}).Item2;
}
catch (InvalidOperationException ex)
{
throw new InvalidExpressionException($"Unrecognized Token {str}", ex);
}
if (_type.IsOperand())
{
retTokens.Add(tokenFactory.CreateValueToken(_type, Convert.ChangeType(str, ValueExpTypeToValueType[_type])));
}
else if (_type.IsOperator())
{
retTokens.Add(tokenFactory.CreateToken(_type));
}
else if (_type.IsSpecial())
{
retTokens.Add(tokenFactory.CreateSpecialToken(_type));
}
else
{
throw new ArgumentException($"Unrecoginzed Type: {_type.ToString()}");
}
}
return(retTokens);
}
