Agreed, I wouldn't break binary compatibility in a minor release, if this change is to be made it should be done in the next major release branch IMO
On Mon, Jun 8, 2015 at 3:02 PM, Winnebeck, Jason <jason.winneb...@windstream.com> wrote: > If this isn't a clear cut fix then you might want consider leaving it as it > is for backwards compatibility. Groovy already has enough issues with > breaking changes. At first it looks reasonable that unary - should have > precedence over everything but (), but taking the power of a negative number > is not normally a sensible thing to do since it only works when the right > hand side is an integer and half the time the result is positive. So, in my > mind there are arguments for both sides, and then when applied to something > as critical as source compatibility, it really lends to keeping existing > behavior, in my opinion. > > Jason > > -----Original Message----- > From: Paul King [mailto:pa...@asert.com.au] > Sent: Sunday, June 07, 2015 10:26 AM > To: users@groovy.incubator.apache.org > Subject: Re: precedence rules for power operator vs -, +, ++, -- > > > OK, looks like there is precedence in both directions: > > http://en.wikipedia.org/wiki/Order_of_operations#Exceptions > > > On 7/06/2015 11:48 PM, Jochen Theodorou wrote: >> "-8 - 1" >> >> is in all languages I tests -9. That means Pyhton, Lua, Java, Ruby, QBasic, >> Javascript, Go. And that in general independent of spacing. >> >> bye blackdrag >> >> Am 07.06.2015 13:50, schrieb Paul King: >>> >>> What do lua/python/ruby return for "-8 - 1"? >>> >>> On 7/06/2015 8:40 PM, Jochen Theodorou wrote: >>>> Am 06.06.2015 13:08, schrieb Paul King: >>>> [...] >>>>> def x = 5 >>>>> assert -x ** 2 == -25 // treated as -(x ** 2) assert --x ** 2 == >>>>> 24 // treated as --(x ** 2) >>>>> >>>>> This behavior is different to the other operators and different to >>>>> what the comments in the grammar describe as the intended behavior >>>>> but the order of two rules was presumably accidentally reversed in the >>>>> grammar. >>>>> >>>>> After the change, the following executes: >>>>> >>>>> def x = 5 >>>>> assert -x ** 2 == 25 // treated as (-x) ** 2 >>>>> assert --x ** 2 == 16 // treated as (--x) ** 2 >>>> >>>> I just checked Ruby and Python and there -2**4 will return -16, same >>>> for -2^4 in Lua. So now I am wondering if that is the right thing >>>> for unary minus >>>> >>>> bye blackdrag >>>> >>> >>> >>> --- >>> This email has been checked for viruses by Avast antivirus software. >>> https://www.avast.com/antivirus >>> >> >> > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > > ---------------------------------------------------------------------- > This email message and any attachments are for the sole use of the intended > recipient(s). Any unauthorized review, use, disclosure or distribution is > prohibited. If you are not the intended recipient, please contact the sender > by reply email and destroy all copies of the original message and any > attachments. -- Graeme Rocher
