;;; thingatpt.el --- Get the `thing' at point
-;; Copyright (C) 1991,92,93,94,95,1996 Free Software Foundation, Inc.
+;; Copyright (C) 1991,92,93,94,95,96,1997 Free Software Foundation, Inc.
;; Author: Mike Williams <mikew@gopher.dosli.govt.nz>
;; Keywords: extensions, matching, mouse
The value is a cons cell (START . END) giving the start and end positions
of the textual entity that was found."
- (let ((orig (point)))
- (condition-case nil
- (save-excursion
- ;; Try moving forward, then back.
- (let ((end (progn
- (funcall
- (or (get thing 'end-op)
- (function (lambda () (forward-thing thing 1)))))
- (point)))
- (beg (progn
- (funcall
- (or (get thing 'beginning-op)
- (function (lambda () (forward-thing thing -1)))))
- (point))))
- (if (not (and beg (> beg orig)))
- ;; If that brings us all the way back to ORIG,
- ;; it worked. But END may not be the real end.
- ;; So find the real end that corresponds to BEG.
- (let ((real-end
- (progn
+ (if (get thing 'bounds-of-thing-at-point)
+ (funcall (get thing 'bounds-of-thing-at-point))
+ (let ((orig (point)))
+ (condition-case nil
+ (save-excursion
+ ;; Try moving forward, then back.
+ (let ((end (progn
(funcall
(or (get thing 'end-op)
(function (lambda () (forward-thing thing 1)))))
+ (point)))
+ (beg (progn
+ (funcall
+ (or (get thing 'beginning-op)
+ (function (lambda () (forward-thing thing -1)))))
(point))))
- (if (and beg real-end (<= beg orig) (<= orig real-end))
- (cons beg real-end)))
- (goto-char orig)
- ;; Try a second time, moving backward first and then forward,
- ;; so that we can find a thing that ends at ORIG.
- (let ((beg (progn
- (funcall
- (or (get thing 'beginning-op)
- (function (lambda () (forward-thing thing -1)))))
- (point)))
- (end (progn
+ (if (not (and beg (> beg orig)))
+ ;; If that brings us all the way back to ORIG,
+ ;; it worked. But END may not be the real end.
+ ;; So find the real end that corresponds to BEG.
+ (let ((real-end
+ (progn
(funcall
(or (get thing 'end-op)
(function (lambda () (forward-thing thing 1)))))
- (point)))
- (real-beg
- (progn
- (funcall
- (or (get thing 'beginning-op)
- (function (lambda () (forward-thing thing -1)))))
- (point))))
- (if (and real-beg end (<= real-beg orig) (<= orig end))
- (cons real-beg end))))))
- (error nil))))
+ (point))))
+ (if (and beg real-end (<= beg orig) (<= orig real-end))
+ (cons beg real-end)))
+ (goto-char orig)
+ ;; Try a second time, moving backward first and then forward,
+ ;; so that we can find a thing that ends at ORIG.
+ (let ((beg (progn
+ (funcall
+ (or (get thing 'beginning-op)
+ (function (lambda () (forward-thing thing -1)))))
+ (point)))
+ (end (progn
+ (funcall
+ (or (get thing 'end-op)
+ (function (lambda () (forward-thing thing 1)))))
+ (point)))
+ (real-beg
+ (progn
+ (funcall
+ (or (get thing 'beginning-op)
+ (function (lambda () (forward-thing thing -1)))))
+ (point))))
+ (if (and real-beg end (<= real-beg orig) (<= orig end))
+ (cons real-beg end))))))
+ (error nil)))))
;;;###autoload
(defun thing-at-point (thing)
See the file `thingatpt.el' for documentation on how to define
a symbol as a valid THING."
- (let ((bounds (bounds-of-thing-at-point thing)))
- (if bounds
- (buffer-substring (car bounds) (cdr bounds)))))
+ (if (get thing 'thing-at-point)
+ (funcall (get thing 'thing-at-point))
+ (let ((bounds (bounds-of-thing-at-point thing)))
+ (if bounds
+ (buffer-substring (car bounds) (cdr bounds))))))
;; Go to beginning/end
(put 'filename 'beginning-op
'(lambda () (skip-chars-backward thing-at-point-file-name-chars)))
-(defvar thing-at-point-url-chars "~/A-Za-z0-9---_@$%&=.,"
- "Characters allowable in a URL.")
-
-(put 'url 'end-op
- '(lambda () (skip-chars-forward (concat ":" thing-at-point-url-chars))
- (skip-chars-backward ".,:")))
+(defvar thing-at-point-url-path-regexp
+ "[^]\t\n \"'()<>[^`{}]*[^]\t\n \"'()<>[^`{}.,;]+"
+ "A regular expression probably matching the host, path or e-mail part of a URL.")
+
+(defvar thing-at-point-short-url-regexp
+ (concat "[-A-Za-z0-9.]+" thing-at-point-url-path-regexp)
+ "A regular expression probably matching a URL without an access scheme.
+Hostname matching is stricter in this case than for
+``thing-at-point-url-regexp''.")
+
+(defvar thing-at-point-url-regexp
+ (concat
+ "\\(https?://\\|ftp://\\|gopher://\\|telnet://\\|wais://\\|file:/\\|s?news:\\|mailto:\\)"
+ thing-at-point-url-path-regexp)
+ "A regular expression probably matching a complete URL.")
+
+(defvar thing-at-point-markedup-url-regexp
+ "<URL:[^>]+>"
+ "A regular expression matching a URL marked up per RFC1738.
+This may contain whitespace (including newlines) .")
+
+(put 'url 'bounds-of-thing-at-point 'thing-at-point-bounds-of-url-at-point)
+(defun thing-at-point-bounds-of-url-at-point ()
+ (let ((url "") short strip)
+ (if (or (setq strip (thing-at-point-looking-at
+ thing-at-point-markedup-url-regexp))
+ (thing-at-point-looking-at thing-at-point-url-regexp)
+ ;; Access scheme omitted?
+ (setq short (thing-at-point-looking-at
+ thing-at-point-short-url-regexp)))
+ (let ((beginning (match-beginning 0))
+ (end (match-end 0)))
+ (cond (strip
+ (setq beginning (+ beginning 5))
+ (setq end (- end 1))))
+ (cons beginning end)))))
+
+(put 'url 'thing-at-point 'thing-at-point-url-at-point)
+(defun thing-at-point-url-at-point ()
+ "Return the URL around or before point.
+Search backwards for the start of a URL ending at or after
+point. If no URL found, return nil. The access scheme, `http://'
+will be prepended if absent."
+ (let ((url "") short strip)
+ (if (or (setq strip (thing-at-point-looking-at
+ thing-at-point-markedup-url-regexp))
+ (thing-at-point-looking-at thing-at-point-url-regexp)
+ ;; Access scheme omitted?
+ (setq short (thing-at-point-looking-at
+ thing-at-point-short-url-regexp)))
+ (progn
+ (setq url (buffer-substring-no-properties (match-beginning 0)
+ (match-end 0)))
+ (and strip (setq url (substring url 5 -1))) ; Drop "<URL:" & ">"
+ ;; strip whitespace
+ (while (string-match "\\s +\\|\n+" url)
+ (setq url (replace-match "" t t url)))
+ (and short (setq url (concat (if (string-match "@" url)
+ "mailto:" "http://") url)))
+ (if (string-equal "" url)
+ nil
+ url)))))
+
+;; The normal thingatpt mechanism doesn't work for complex regexps.
+;; This should work for almost any regexp wherever we are in the
+;; match. To do a perfect job for any arbitrary regexp would mean
+;; testing every position before point. Regexp searches won't find
+;; matches that straddle the start position so we search forwards once
+;; and then back repeatedly and then back up a char at a time.
+
+(defun thing-at-point-looking-at (regexp)
+ "Return non-nil if point is in or just after a match for REGEXP.
+Set the match data from the earliest such match ending at or after
+point."
+ (save-excursion
+ (let ((old-point (point)) match)
+ (and (looking-at regexp)
+ (>= (match-end 0) old-point)
+ (setq match (point)))
+ ;; Search back repeatedly from end of next match.
+ ;; This may fail if next match ends before this match does.
+ (re-search-forward regexp nil 'limit)
+ (while (and (re-search-backward regexp nil t)
+ (or (> (match-beginning 0) old-point)
+ (and (looking-at regexp) ; Extend match-end past search start
+ (>= (match-end 0) old-point)
+ (setq match (point))))))
+ (if (not match) nil
+ (goto-char match)
+ ;; Back up a char at a time in case search skipped
+ ;; intermediate match straddling search start pos.
+ (while (and (not (bobp))
+ (progn (backward-char 1) (looking-at regexp))
+ (>= (match-end 0) old-point)
+ (setq match (point))))
+ (goto-char match)
+ (looking-at regexp)))))
+
+;; Can't do it sensibly?
+;(put 'url 'end-op
+; '(lambda () (skip-chars-forward (concat ":" thing-at-point-url-chars))
+; (skip-chars-backward ".,:")))
(put 'url 'beginning-op
'(lambda ()
- (skip-chars-backward thing-at-point-url-chars)
- (or (= (preceding-char) ?:)
- (error "No URL here"))
- (forward-char -1)
- (skip-chars-backward "a-zA-Z")))
+ (let ((bounds (thing-at-point-bounds-of-url-at-point)))
+ (if bounds
+ (goto-char (car bounds))
+ (error "No URL here")))))
;; Whitespace
projects / emacs.git / commitdiff