[cfe-commits] clang formatter patch to move and rename RewriterTestContext.h

[Douglas Gregor]

[Re-adding cfe-commits]

On Dec 18, 2012, at 10:16 AM, Daniel Jasper <djasper at google.com> wrote:

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> 
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> On Tue, Dec 18, 2012 at 6:41 PM, Douglas Gregor <dgregor at apple.com> wrote:
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> On Dec 18, 2012, at 1:09 AM, Daniel Jasper <djasper at google.com> wrote:
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>> 
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>> On Mon, Dec 17, 2012 at 11:04 PM, Douglas Gregor <dgregor at apple.com> wrote:
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>> On Dec 17, 2012, at 9:55 AM, Daniel Jasper <djasper at google.com> wrote:
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>>> Hi Fariborz,
>>> 
>>> I am taking a look at your patch, but please bear with me for another day or two. I am not yet convinced that mingling C++ and ObjC formatting that closely is a wise decision. I think we might need something that clearly separates the different modes. And you touch a lot of code that I intended to refactor into something halfway sane this week. I will take your patch into consideration when doing so, but it might need some changes afterwards.
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>> If we're going to distinguish the modes, we need to do so syntactically. Objective-C++ is a very popular dialect; we can't simply rely on extrinsic knowledge of whether we're dealing with Objective-C or C++ to make these decisions.
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>> I am not sure I fully understand this. We are currently relying on a Lexer which in turn requires LangOptions to create the correct tokens. Same for the identifier table we use to split raw_identifiers into identifiers and keywords. Are you saying the formatter should not capitalize on this knowledge of the input token stream?
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> Oh, it should certainly capitalize on this knowledge. My concern is that, when you mentioned that we might need something that "clearly separates the different modes", you were thinking of Objective-C and C++ as independent languages that aren't used together. Fortunately, we can tell syntactically whether we're in an Objective-C method declaration fairly easily: they start with + or -, almost always in the first column, so if it would be better to go down a different code-formatting path where the rules for spacing around (/)/: are different, we could do that instead.
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> 	- Doug
> 
> Yeah, "clearly separate" was probably stronger phrased than intended. One of the things I wonder is the following:
> If we are not in Objective-C according to the LangOptions and we discover a + or - at the beginning of a "line", should we assume an error has happened (e.g. forgotten "}" or ";") or try to format as an Objective-C declaration?

I think we should assume that an error has occurred. If clients don't know the language dialect, they should pick something maximally inclusive (e.g., Objective-C++11). 

	- Doug

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