[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: first-class support for csharp in cc-mode.el

From: dino chiesa
Subject: RE: first-class support for csharp in cc-mode.el
Date: Wed, 30 Dec 2009 08:29:14 -0800

Hi Alan, nice to meet you.
Stefan, thanks for the input. 
address@hidden wrote:
>> I don't have much experience with emacs-devel, but what would it take
>> to get csharp to be supported as a first-class (built-in) language in
>> cc-mode?
> The current policy is not to add any more languages to the core of CC
> Mode, since it's hassle enough supporting the seven that are already
> there. There are certainly lots of users of C, C++, Java, several users
> of Objective C and AWK, but I just don't know about Pike and IDL. The
> problem is, when somebody implements support for a language directly in
> CC Mode and they move on a few years later, support for that langauge
> effectively vanishes. It was to fix this that Martin Stjernholm (my
> predecessor) implemented the c-lang-const mechanism.
Very clear. In that case I should be petitioning to get csharp-mode put into 
the emacs progmodes distrib separately, rather than petitioning to get 
csharp-mode folded into cc-mode.

> If the c-lang-const stuff is inadequate to support, say, C#, then I
> would prefer to amend CC Mode so that C# can be supported. It looks
> like the @"....." syntax will need such an amendment. This will
> probably involve a large change, since the use of \ as an escape
> character is firmly embedded in the very fabric of CC Mode. Is @ used
> for anything else in C#? Is it forbidden to have whitespace between @
> and "?
Yes, according to the lang spec, the @ must immediately be followed by a 
double-quote. The symbol is not used for anything else in the language. I just 
looked and this is called a "verbatim string literal".

> In fact, I've just thought of a way of fixing this: in an after-change
> function, splat the syntax (using syntax-table text-properties) of
> anything within @"....". I think there's already a suitable hook in CC
> Mode for this.
Is this the approach used for handling of slashes within awk? (can be either a 
divide operator or a string delimiter). I tried wading through that code but 
didn't yet figure it out.
In csharp, it is not only a trailing slash that is special - the verbatim 
string also allows verbatim newlines in the string. This is legal:
var s = @"The quick brown fox
jumps over the lazy dog";
and results in a string with a \n between the 4th and 5th words.
I don't know how that might affect the final design of a solution, or if it 
recommends or disrecommends Stefan's suggestion to worry only about the final 

>> I have no idea if this is a friendly proposal or not, but it would
>> make things nice for people who write C# and use emacs.
> Thanks for the proposal! Constructive suggestions are always welcome at
> CC Mode. By the way, CC Mode has its own mailing list at
> address@hidden and is hosted on sourceforge for historical reasons.
Ah, very good. Is bug-cc-mode intended to serve discussion related only to bugs 
or potential bugs, or is it also good for random discussion or questions from 
cc-derived modes? I mean, if I were to ask specifically about the verbatim 
string literals, should I ask on emacs-devel or is it better on bug-cc-mode ?

>> There are still a few issues with that C# mode - lambdas have no
>> special support, and the new dynamic keyword in .NET 4.0 isn't there
>> (simple to add), and there is the literal string thing I described in
>> my other mail thread - but mostly it works well. Including this would
>> provide a good baseline of support in emacs for C#.
> Those are all issues for C# Mode's maintainer.
Right, those are issues for me (and friends) to own. I wasn't really asking for 
*that*, although I may ask for specific advice on some of those in the future, 
after I take a run at them, I hope you don't mind.

My real goal regarding "first class support" is to make csharp-mode official 
and standard, so that someone downloading emacs 24 or 23.x will just get it. I 
had originally thought that meant major surgery on cc-mode, but you're telling 
me it could be simpler than that.

address@hidden wrote:
> So you're moving towards a CC-mode which is more like
> a "generic" engine? That's good to hear. Do you intend to then move
> support for AWK, IDL, Java, etc.. outside of the core CC-mode as well?

I'll let Alan address that.                                       
Hotmail: Powerful Free email with security by Microsoft.

reply via email to

[Prev in Thread] Current Thread [Next in Thread]