private ClassDefinition ParseClassDefinition(TokenStream tokens, TopLevelConstruct owner, Token staticToken, Token finalToken, FileScope fileScope, AnnotationCollection classAnnotations)
        {
            Token classToken     = tokens.PopExpected(this.parser.Keywords.CLASS);
            Token classNameToken = tokens.Pop();

            this.parser.VerifyIdentifier(classNameToken);
            List <Token>  baseClassTokens  = new List <Token>();
            List <string> baseClassStrings = new List <string>();

            if (tokens.PopIfPresent(":"))
            {
                if (baseClassTokens.Count > 0)
                {
                    tokens.PopExpected(",");
                }

                Token  baseClassToken = tokens.Pop();
                string baseClassName  = baseClassToken.Value;

                this.parser.VerifyIdentifier(baseClassToken);
                while (tokens.PopIfPresent("."))
                {
                    Token baseClassTokenNext = tokens.Pop();
                    this.parser.VerifyIdentifier(baseClassTokenNext);
                    baseClassName += "." + baseClassTokenNext.Value;
                }

                baseClassTokens.Add(baseClassToken);
                baseClassStrings.Add(baseClassName);
            }

            ClassDefinition cd = new ClassDefinition(
                classToken,
                classNameToken,
                baseClassTokens,
                baseClassStrings,
                owner,
                parser.CurrentLibrary,
                staticToken,
                finalToken,
                fileScope,
                classAnnotations);

            tokens.PopExpected("{");
            List <FunctionDefinition> methods              = new List <FunctionDefinition>();
            List <FieldDeclaration>   fields               = new List <FieldDeclaration>();
            ConstructorDefinition     constructorDef       = null;
            ConstructorDefinition     staticConstructorDef = null;

            while (!tokens.PopIfPresent("}"))
            {
                AnnotationCollection annotations = this.parser.AnnotationParser.ParseAnnotations(tokens);

                if (tokens.IsNext(this.parser.Keywords.FUNCTION) ||
                    tokens.AreNext(this.parser.Keywords.STATIC, this.parser.Keywords.FUNCTION))
                {
                    methods.Add(this.parser.ExecutableParser.ParseFunction(tokens, cd, fileScope, annotations));
                }
                else if (tokens.IsNext(this.parser.Keywords.CONSTRUCTOR))
                {
                    if (constructorDef != null)
                    {
                        throw this.parser.GenerateParseError(
                                  ErrorMessages.CLASS_CANNOT_HAVE_MULTIPLE_CONSTRUCTORS,
                                  tokens.Pop());
                    }

                    constructorDef = this.parser.ExecutableParser.ParseConstructor(tokens, cd, annotations);
                }
                else if (tokens.AreNext(this.parser.Keywords.STATIC, this.parser.Keywords.CONSTRUCTOR))
                {
                    tokens.Pop(); // static token
                    if (staticConstructorDef != null)
                    {
                        throw new ParserException(tokens.Pop(), "Multiple static constructors are not allowed.");
                    }

                    staticConstructorDef = this.parser.ExecutableParser.ParseConstructor(tokens, cd, annotations);
                }
                else if (tokens.IsNext(this.parser.Keywords.FIELD) ||
                         tokens.AreNext(this.parser.Keywords.STATIC, this.parser.Keywords.FIELD))
                {
                    fields.Add(this.parser.ExecutableParser.ParseField(tokens, cd, annotations));
                }
                else
                {
                    tokens.PopExpected("}");
                }

                TODO.CheckForUnusedAnnotations();
            }

            cd.Methods           = methods.ToArray();
            cd.Constructor       = constructorDef;
            cd.StaticConstructor = staticConstructorDef;
            cd.Fields            = fields.ToArray();

            return(cd);
        }