From: Mark Piffer <mark.piffer@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: first steps in elisp
Date: Thu, 24 Nov 2016 15:00:59 -0800 (PST) [thread overview]
Message-ID: <271a22de-593b-479d-a3d7-4aecbce934fb@googlegroups.com> (raw)
I am trying to write some helper functions which should ease documentation of C as per the method which my customers require (mostly repetition of parameters as Doxygen-enabled comments - I don't think that that's a good idea, but the customer wants it). I coudn't find a package that was primitive enough to help me with the parsing - the code is embedded C and quite non-standard with respect to compiler extensions. So I tried to walk the extra mile and code a little elisp for fun. Which things are especially bad or unusual concerning both, Lisp and emacs?
(defun ignore-multiline-comment (nlines)
"assumes point is inside a C multiline comment /*. Advances
until end of comment */ or nlines becomes 0"
(if (zerop nlines)
nil
(if (looking-at ".*?\\*/")
(progn
(goto-char (match-end 0))
(ignore-line-comments nlines))
(beginning-of-line 2)
(ignore-multiline-comment (1- nlines)))))
(defun ignore-line-comments (nlines)
"return the text starting at point as a list, going nlines lines down, stripped of
all C comments (except pathological cases w/ string literals)"
(if (zerop nlines)
nil
(setq ml-e (if (looking-at "\\(.*?\\)/\\*") ;; test on /* comment
(match-end 1)
nil))
(setq sl-e (if (looking-at "\\(.*?\\)//") ;; test on // comment
(match-end 1)
nil))
(if (or sl-e ml-e) ;; any comment on line?
(if (and ml-e (or (not sl-e) (< ml-e sl-e))) ;; is /* the only or first comment?
(progn
(setq r (buffer-substring-no-properties (point) ml-e))
(goto-char ml-e)
(cons r (ignore-multiline-comment nlines)))
(setq r (buffer-substring-no-properties (point) sl-e))
(beginning-of-line 2)
(cons r (ignore-line-comments (1- nlines))))
(looking-at ".*$")
(setq r (buffer-substring-no-properties (car (match-data)) (cadr (match-data))) )
(beginning-of-line 2)
(cons r (ignore-line-comments (1- nlines))))))
next reply other threads:[~2016-11-24 23:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-24 23:00 Mark Piffer [this message]
2016-11-25 5:39 ` first steps in elisp Marcin Borkowski
2016-11-25 8:00 ` Joost Kremers
2016-12-21 17:57 ` Thien-Thi Nguyen
2017-04-12 6:26 ` Steve
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