Re: [RFC] [PATCH] Provide the ability to write the frame unwinder in Python

[Doug Evans <dje@google.com>]

On Wed, Mar 18, 2015 at 1:57 AM, Andy Wingo <wingo@igalia.com> wrote:
> Hi,
>
> [-asmundak, as he probably doesn't care :)]
>
> On Tue 17 Mar 2015 23:21, Doug Evans <dje@google.com> writes:
>
>> On Tue, Mar 17, 2015 at 1:57 AM, Andy Wingo <wingo@igalia.com> wrote:
>>>> As to the class of an object passed to a sniffer, how about calling it
>>>> FrameData? Note that it's not very important from the user's point of
>>>> view as sniffer code does not ever reference it by name.
>>>
>>> It's true that from user code it barely matters to Python, but Scheme's
>>> monomorphic flavor makes these things more apparent:
>>>
>>>   (frame-data-read-register frame "r0")
>>>
>>> This doesn't read so well to me -- is it "read-register" on a
>>> "frame-data", or is it "data-read-register" on a "frame" ?  A weak point
>>> but "ephemeral-frame-read-register" avoids the question.
>>
>> As food for discussion,
>> I know some people use foo:bar in Scheme to separate
>> the object "foo" from the operation on it "bar".
>> -> frame-data:read-register
>
> This convention is not often used in Guile.  When it is used, it often
> denotes field access rather than some more involved procedure call --
> similar to the lowercase "foo_bar()" versus camel-cased "FooBar()" in
> Google C++ guidelines.
>
>> I like having some separator, but I went with what
>> I thought was the preferred spelling (all -'s).
>> It's not too late to change gdb/guile to use foo:bar throughout (IMO),
>> but the door is closing.
>
> FWIW, I prefer "-".

Even though a different character solves a problem?
What problem does it introduce?

The comparison with _ vs CamelCase is apples and oranges.
They don't separate object/class name from method name.
If I were to invoke static method read_register on class
ephemeral_frame it would be ephemeral_frame::read_register().
The problem of the readability of frame-data-read-register
that ephemeral-frame-read-register attempts to solve
just doesn't arise. Same with frame-data:read-register.