Re: cc-mode help - how to support literal strings in C# syntax?

[Andreas Roehler]

dino chiesa wrote:
>  
> I'm improving the csharp-mode from http://www.emacswiki.org/emacs/CSharpMode 
> .  In case you're not aware, it's derived from cc-mode, something like Java, 
> but with a few different syntactic quirks. 
>  
> The existing csharp-mode.el is pretty good. 
> There were a couple things I fixed: 
>  
> - #if/else/endif was not being properly recognized, 
> was indenting and fontifying strangely
>  
> - a struct was not being treated as a class - indenting inside the block was 
> broken.
>  
> - class definitions that derived from other classes were not being parsed as 
> a class.  
>  
> These are all minor things I was able to resolve by using c-lang-defconst on 
> various constants:  c-typeless-decl-kwds, c-other-block-decl-kwds, 
> c-cpp-message-directives, c-cpp-expr-directives, c-colon-type-list-kwds, 
> c-symbol-chars, c-block-prefix-disallowed-chars, and a few others.
>  
> There's one think I haven't been able to resolve.  In C# syntax, strings can 
> be specified as they are in C - surrounded by quotes.  There's also a special 
> form of literal string that begins with @, n which all characters in the 
> string are to be treated as "escaped".  In other words 
>  
>   @"\usr\bin" == "\\usr\\bin"
>  
> The problem happens when the literal string ends in a slash.  Eg @"\usr\bin\" 
>  The cc-mode syntax engine sees that as an unterminated string, the \" is an 
> escaped double-quote.  On the other hand the C# compiler sees it as a string 
> of 9 chars. 
>  
> Because it isn't parsed correctly, the fontification and indenting is wrong 
> after a @-prefixed string that ends in a slash. 
>  
>  
> How can I get the prefixed strings to be treated correctly?  
>  

Made a beg-end.el for this kind of parsings.
Would try it with your problem.
Feel free to send me your mode as far its done.
Maybe some larger test-code too.

Should you want to try it yourself, get beg-end.el at

https://code.launchpad.net/s-x-emacs-werkstatt/


Andreas




> 
> Defining a special c-in-literal seems not to be it.  That function uses 
> parse-partial-sexp , which apparently determines if the point is within a 
> string or not.  
>  
> Modifying the syntax table to insert @ as a special prefix is also not it.  
>  
> Any suggestions? 
>  
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