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2 styles of string literals, using cc-mode
From: |
yary |
Subject: |
2 styles of string literals, using cc-mode |
Date: |
Tue, 21 Oct 2008 10:54:10 -0700 (PDT) |
User-agent: |
G2/1.0 |
Hi all,
I'm using csharp-mode by Moonfire games ( http://mfgames.com/linux/csharp-mode
), which is derived from cc-mode.
C# has a "feature", two styles of strings. Regular strings are very
much like C strings, starting and ending with double quotes, backslash
escapes allowed inside.
@"Verbatim literal strings look like this"- they have an at-sign just
before the double-quote. Verbatim literal strings can have embedded
newlines, regular strings can't. Backslashes have no special meaning
inside verbatim literals, so:
@"\x00" == "\\x00"
@"foo\" == "foo\\"
I haven't hacked much cc-mode or elisp in general, still it was pretty
simple to get multiline verbatim literals working:
;; Can't escape a newline in a regular string
(c-lang-defconst c-string-escaped-newlines
csharp nil)
;; Literal strings can be multiline without escaping
(c-lang-defconst c-multiline-string-start-char
csharp ?@)
I had expected the @ to fontify the same as the " in @" after adding
the following, but these seem to have made no difference:
;; Start of a comment or any string literal- copied from cc-lang,
added @? before \"
(c-lang-defconst c-literal-start-regexp
csharp (concat (c-lang-const c-comment-start-regexp)
"\\|"
(if (memq 'gen-string-delim c-emacs-features)
"@?\"|"
"@?\"")))
;; add verbatim string literal to primary regexp
(c-lang-defconst c-primary-expr-regexp
csharp (concat (c-lang-const c-primary-expr-regexp)
"\\|@\""))
... and I have no clue how to tell emacs to change the syntax of \
inside a verbatim literal in csharp mode, so it won't be an escape
anymore. I took a look at cc-engine.el to get a clue as to how it
works, but its elisp is too advanced for me. Any pointers?
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