Boo.Lang.Parser.BooParserBase.generator_expression_body C# (CSharp) Method

        public void generator_expression_body(
		GeneratorExpression ge
	)
        {
            StatementModifier filter = null;
            Expression iterator = null;
            DeclarationCollection declarations = null == ge ? null : ge.Declarations;

            try {      // for error handling
            declaration_list(declarations);
            match(IN);
            iterator=boolean_expression();
            if (0==inputState.guessing)
            {
                ge.Iterator = iterator;
            }
            {
                if ((LA(1)==IF||LA(1)==UNLESS||LA(1)==WHILE) && (tokenSet_5_.member(LA(2))))
                {
                    filter=stmt_modifier();
                    if (0==inputState.guessing)
                    {
                        ge.Filter = filter;
                    }
                }
                else if ((tokenSet_14_.member(LA(1))) && (tokenSet_15_.member(LA(2)))) {
                }
                else
                {
                    throw new NoViableAltException(LT(1), getFilename());
                }

            }
            }
            catch (RecognitionException ex)
            {
            if (0 == inputState.guessing)
            {
                reportError(ex, "generator_expression_body");
                recover(ex,tokenSet_14_);
            }
            else
            {
                throw ex;
            }
            }
        }