Method doShift

src/stone/Parser.java:201–215

(Lexer lexer, ASTree left, int prec)

            res.add(right);
        }
        private ASTree doShift(Lexer lexer, ASTree left, int prec)
            throws ParseException
        {
            ArrayList<ASTree> list = new ArrayList<ASTree>();
            list.add(left);
            list.add(new ASTLeaf(lexer.read()));
            ASTree right = factor.parse(lexer);
            Precedence next;
            while ((next = nextOperator(lexer)) != null
                   && rightIsExpr(prec, next))
                right = doShift(lexer, right, next.value);

            list.add(right);
            return factory.make(list);
        }
        private Precedence nextOperator(Lexer lexer) throws ParseException {
            Token t = lexer.peek(0);
            if (t.isIdentifier())