(c-defun-name, c-cpp-define-name): New optimised functions to get the

name of the current defun/macro.

1 files changed, 75 insertions, 0 deletions

diff --git a/lisp/progmodes/cc-cmds.el b/lisp/progmodes/cc-cmds.el
index 7afe6e6c243..ba1ce001473 100644
--- a/lisp/progmodes/cc-cmds.el
+++ b/lisp/progmodes/cc-cmds.el
@@ -1679,6 +1679,72 @@ the open-parenthesis that starts a defun; see `beginning-of-defun'."
     (c-keep-region-active)
     (= arg 0)))
 
+(defun c-defun-name ()
+  "Return the name of the current defun, or NIL if there isn't one.
+\"Defun\" here means a function, or other top level construct
+with a brace block."
+  (interactive)
+  (c-save-buffer-state
+      (beginning-of-defun-function end-of-defun-function
+       where pos name-end)
+ 
+    (save-excursion
+      ;; Move back out of any macro/comment/string we happen to be in.
+      (c-beginning-of-macro)
+      (setq pos (c-literal-limits))
+      (if pos (goto-char (car pos)))
+
+      (setq where (c-where-wrt-brace-construct))
+
+      ;; Move to the beginning of the current defun, if any, if we're not
+      ;; already there.
+      (if (eq where 'outwith-function)
+          nil
+        (unless (eq where 'at-header)
+          (c-backward-to-nth-BOF-{ 1 where)
+          (c-beginning-of-decl-1))
+
+        ;; Pick out the defun name, according to the type of defun.
+        (cond
+         ((and (looking-at c-type-prefix-key)
+               (progn (c-forward-token-2 2) ; over "struct foo "
+                      (eq (char-after) ?\{)))
+          ;; struct, union, enum, or similar:
+          (c-backward-syntactic-ws)
+          (setq name-end (point))
+          (buffer-substring-no-properties
+           (progn
+             (c-backward-token-2 2)
+             (point))
+           name-end))
+
+         ((looking-at "DEFUN\\_>")
+          ;; DEFUN ("file-name-directory", Ffile_name_directory, Sfile_name_directory, ...) ==> Ffile_name_directory
+          ;; DEFUN(POSIX::STREAM-LOCK, stream lockp &key BLOCK SHARED START LENGTH) ==> POSIX::STREAM-LOCK        
+          (down-list 1)
+          (c-forward-syntactic-ws)
+          (when (eq (char-after) ?\")
+            (forward-sexp 1)
+            (c-forward-token-2))        ; over the comma and following WS.
+          (buffer-substring-no-properties
+           (point)
+           (progn
+             (c-forward-token-2)
+             (c-backward-syntactic-ws)
+             (point))))
+                
+         (t
+         ;; Normal function or initializer.
+          (when (c-syntactic-re-search-forward "[{(]" nil t)
+            (backward-char)
+            (c-backward-syntactic-ws)
+            (when (eq (char-before) ?\=) ; struct foo bar = {0, 0} ;
+              (c-backward-token-2)
+              (c-backward-syntactic-ws))
+            (setq name-end (point))
+            (c-backward-token-2)
+            (buffer-substring-no-properties (point) name-end))))))))
+
 (defun c-declaration-limits (near)
   ;; Return a cons of the beginning and end positions of the current
   ;; top level declaration or macro.  If point is not inside any then
@@ -1810,6 +1876,15 @@ function does not require the declaration to contain a brace block."
       (goto-char (car decl-limits))
       (push-mark (cdr decl-limits) nil t))))
 
+(defun c-cpp-define-name ()
+  "Return the name of the current CPP macro, or NIL if we're not in one."
+  (interactive)
+  (save-excursion
+    (and c-opt-cpp-macro-define-start
+         (c-beginning-of-macro)
+         (looking-at c-opt-cpp-macro-define-start)
+         (match-string-no-properties 1))))
+
 
 ;; Movement by statements.
 (defun c-in-comment-line-prefix-p ()