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Re: search across linebreaks


From: Eric Abrahamsen
Subject: Re: search across linebreaks
Date: Tue, 19 Feb 2013 09:22:18 +0800
User-agent: Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.2 (gnu/linux)

"Nicolas Richard" <address@hidden> writes:

> Eric Abrahamsen <address@hidden> writes:
>> The two solutions I can think of are: 1) break up the characters in the
>> search string and insert "\n?" between each one to create regexps to
>> search on, and 2) unfill the whole file at the start of the procedure
>> and then refill it afterwards. Neither of these seems like a great
>> idea -- does anyone have any brighter ideas?
>
> Not bright by any means, but slightly different from your solutions. The idea
> is : save newlines as markers (except if two or more consecutive), and
> restore afterwards.
>
> (defun yf/test nil ""
>   (let* (lom marker
>        (dict '(("foo bar" "foo barred")
>                ("foo baz" "foo bazzed")
>                ("foo foo" "foo fooed")))
>        (regexp (regexp-opt (mapcar 'car dict))))
>     ;; replace single newlines by markers (recorded in a list of markers)
>     (while (search-forward "\n" nil t)
>       (if (looking-at "\n")
>         (skip-chars-forward "\n")
>       (replace-match " ")
>       (add-to-list 'lom (set-marker (make-marker) (point)))))
>     (goto-char (point-min))
>     ;; replace matches according to dict
>     (while (re-search-forward regexp nil t)
>       (replace-match (cadr (assoc (match-string 0) dict)) t t))
>     ;; transform markers into newline again
>     (while (setq marker (pop lom))
>       (goto-char marker)
>       (when (looking-at " ")
>       (replace-match ""))
>       (insert "\n"))))

That's a pretty interesting solution, thank you! I don't use markers
much, but the basic idea of the marker -- a spot that remains immobile
relative to the text around it -- seems pretty applicable to my problem.

Thanks!
Eric




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