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Re: Custom searches, like interactively searching palindromes
From: |
Andreas Politz |
Subject: |
Re: Custom searches, like interactively searching palindromes |
Date: |
Wed, 08 Dec 2010 15:30:35 -0000 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) |
Karan Bathla <karan_goku@yahoo.com> writes:
>
> I would like to know how one can interactively search for patterns
> that are not captured by regexes, like palindromes.
>
I had a similar desire and wrote this 2 functions, which can be
used to do what you want, though not for replacing.
(defun isearch-with-predicate (predicate indicator &optional backward regexp)
(lexical-let ((predicate predicate))
(let ((isearch-search-fun-function
(lambda nil
(lambda (string &optional bound no-error)
(let (isearch-search-fun-function)
(search-with-predicate
string (isearch-search-fun)
predicate bound no-error)))))
(isearch-message-prefix-add indicator)
isearch-with-predicate-success
(isearch-mode-end-hook
(lambda nil
(setq isearch-with-predicate-success
(not isearch-mode-end-hook-quit)))))
(funcall (if backward
(if regexp
'isearch-backward-regexp
'isearch-backward)
(if regexp
'isearch-forward-regexp
'isearch-forward)))
(isearch-clean-overlays)
isearch-with-predicate-success)))
(defun search-with-predicate (string
search-fn
predicate
&optional
bound noerror count)
(let (found
limit
(count (or count 1)))
(save-excursion
(while (and (setq found
(funcall search-fn string bound noerror))
(or (not (setq found
(and (funcall predicate)
found)))
(> (decf count) 0))))
(setq limit (point)))
(if found
(goto-char found)
(unless (eq noerror t)
(goto-char limit)
nil))))
(defun isearch-palindrome (&optional regexp)
(interactive "P")
(isearch-with-predicate
(lambda ()
(let* ((word (buffer-substring (match-beginning 0) (match-end 0)))
(prefix (append (substring word 0 (/ (length word) 2)) nil))
(suffix (nreverse (append (substring word (/ (length word) 2))
nil))))
(every '= prefix suffix)))
"(Palindrome)" nil regexp))
-ap
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