20.1.1 Transforming Scheme name to C name

Normally, the name of a C function can be derived given its Scheme name, using some simple textual transformations:

• Replace - (hyphen) with _ (underscore).
• Replace ? (question mark) with "_p".
• Replace ! (exclamation point) with "_x".
• Replace internal -> with "_to_".
• Replace <= (less than or equal) with "_leq".
• Replace >= (greater than or equal) with "_geq".
• Replace < (less than) with "_less".
• Replace > (greater than) with "_gr".
• Replace @ with "at". [Omit?]
• Prefix with "gh_" (or "scm_" if you are ignoring the gh interface).
• [Anything else? –ttn, 2000/01/16 15:17:28]

Here is an Emacs Lisp command that prompts for a Scheme function name and inserts the corresponding C function name into the buffer.

     (defun insert-scheme-to-C (name &optional use-gh)
       "Transforms Scheme NAME, a string, to its C counterpart, and inserts it.
     Prefix arg non-nil means use \"gh_\" prefix, otherwise use \"scm_\" prefix."
       (interactive "sScheme name: \nP")
       (let ((transforms '(("-"  . "_")
                           ("?"  . "_p")
                           ("!"  . "_x")
                           ("->" . "_to_")
                           ("<=" . "_leq")
                           (">=" . "_geq")
                           ("<"  . "_less")
                           (">"  . "_gr")
                           ("@"  . "at"))))
         (while transforms
           (let ((trigger (concat "\\(.*\\)"
                                  (regexp-quote (caar transforms))
                                  "\\(.*\\)"))
                 (sub (cdar transforms))
                 (m nil))
             (while (setq m (string-match trigger name))
               (setq name (concat (match-string 1 name)
                                  sub
                                  (match-string 2 name)))))
           (setq transforms (cdr transforms))))
       (insert (if use-gh "gh_" "scm_") name))