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

[dino chiesa]

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?  
 

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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