ParserState.cs

public abstract class ParserState
{
    private readonly Parser _parser;

    protected ParserState(Parser parser)
    {
        _parser = parser;
        InitRegex();
    }

    public Parser Parser
    {
        get { return _parser; }
    }

    protected Regex VariableRegex { get; private set; }
    protected int ObjectTypeIndex { get; set; }

    protected int ObjectIdIndex
    {
        get;
        set;
    } 

    // required by all state classes to handle specific
    // parsing strategy
    public abstract void ReadLine(string line); 
    
    public virtual void Reset() 
    { 
        // related to nested levels of code,
        // tracking if we are ready for variable declarations etc.
    } 
    
    protected void ParseVariable(string line) 
    { 
        // variable parsing logic here based on the regex below
    } 
    
    private void InitRegex() 
    { 
        // Matching against variablename@variableid : type objectid;
        // e.g. BinContent@1000 : Record 7302;
        // VariableRegex is set here
    }
}