using NUnit.Framework.Constraints;
using System.Collections.Generic;

namespace NewLanguage
{
    public class LexerConstraint : Constraint
    {
        readonly object[] _expected;
        public LexerConstraint(params object[] expected)
        {
            _expected = expected;
        }

        public override bool Matches(object actual)
        {
            List<object> fromLex = new List<object>();
            object lex = (object) actual;

            //for (Token tok = lex.GetNext(); tok.cls != TokenClass.EOF; tok = lex.GetNext())
            //{
            //    fromLex.Add(tok.cls);
            //    fromLex.Add(tok.str);
            //}

            base.actual = fromLex;

            if (fromLex.Count != _expected.Length)
                return false;

            for (int i = 0; i < fromLex.Count; ++i)
            {
                // null is a wildcard
                if (_expected[i] != null)
                    if (!_expected[i].Equals(fromLex[i]))
                        return false;
            }

            return true;
        }

        public override void WriteDescriptionTo(NUnit.Framework.MessageWriter writer)
        {

        }
    }
}