;;; thingatpt.el --- Get the `thing' at point
-;; Copyright (C) 1991,1992,1993,1994,1995 Free Software Foundation, Inc.
+;; Copyright (C) 1991,92,93,94,95,96,97,1998,2000
+;; Free Software Foundation, Inc.
;; Author: Mike Williams <mikew@gopher.dosli.govt.nz>
+;; Maintainer: FSF
;; Keywords: extensions, matching, mouse
;; Created: Thu Mar 28 13:48:23 1991
;;; Commentary:
-;; This file provides routines for getting the `thing' at the location of
-;; point, whatever that `thing' happens to be. The `thing' is defined by
-;; it's beginning and end positions in the buffer.
+;; This file provides routines for getting the "thing" at the location of
+;; point, whatever that "thing" happens to be. The "thing" is defined by
+;; its beginning and end positions in the buffer.
;;
;; The function bounds-of-thing-at-point finds the beginning and end
-;; positions by moving first forward to the end of the `thing', and then
+;; positions by moving first forward to the end of the "thing", and then
;; backwards to the beginning. By default, it uses the corresponding
-;; forward-`thing' operator (eg. forward-word, forward-line).
+;; forward-"thing" operator (eg. forward-word, forward-line).
;;
;; Special cases are allowed for using properties associated with the named
-;; `thing':
+;; "thing":
;;
-;; forward-op Function to call to skip forward over a `thing' (or
+;; forward-op Function to call to skip forward over a "thing" (or
;; with a negative argument, backward).
;;
-;; beginning-op Function to call to skip to the beginning of a `thing'.
-;; end-op Function to call to skip to the end of a `thing'.
+;; beginning-op Function to call to skip to the beginning of a "thing".
+;; end-op Function to call to skip to the end of a "thing".
;;
;; Reliance on existing operators means that many `things' can be accessed
;; without further code: eg.
;; Basic movement
;;;###autoload
-(defun forward-thing (THING &optional N)
+(defun forward-thing (thing &optional n)
"Move forward to the end of the next THING."
- (let ((forward-op (or (get THING 'forward-op)
- (intern-soft (format "forward-%s" THING)))))
- (if (fboundp forward-op)
- (funcall forward-op (or N 1))
- (error "Can't determine how to move over %ss" THING))))
+ (let ((forward-op (or (get thing 'forward-op)
+ (intern-soft (format "forward-%s" thing)))))
+ (if (functionp forward-op)
+ (funcall forward-op (or n 1))
+ (error "Can't determine how to move over a %s" thing))))
;; General routines
;;;###autoload
-(defun bounds-of-thing-at-point (THING)
- "Determine the start and end buffer locations for the THING at point,
-where THING is an entity for which there is a either a corresponding
-forward-THING operation, or corresponding beginning-of-THING and
-end-of-THING operations, eg. 'word, 'sentence, 'defun.
- Return a cons cell '(start . end) giving the start and end positions."
- (let ((orig (point)))
- (condition-case nil
- (save-excursion
- (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 end (<= beg orig) (< orig end))
- (cons beg end))))
- (error nil))))
+(defun bounds-of-thing-at-point (thing)
+ "Determine the start and end buffer locations for the THING at point.
+THING is a symbol which specifies the kind of syntactic entity you want.
+Possibilities include `symbol', `list', `sexp', `defun', `filename', `url',
+`word', `sentence', `whitespace', `line', `page' and others.
+
+See the file `thingatpt.el' for documentation on how to define
+a symbol as a valid THING.
+
+The value is a cons cell (START . END) giving the start and end positions
+of the textual entity that was found."
+ (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 (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))))
+ (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)
- "Return the THING at point, where THING is an entity defined by
-bounds-of-thing-at-point."
- (let ((bounds (bounds-of-thing-at-point THING)))
- (if bounds
- (buffer-substring (car bounds) (cdr bounds)))))
+(defun thing-at-point (thing)
+ "Return the THING at point.
+THING is a symbol which specifies the kind of syntactic entity you want.
+Possibilities include `symbol', `list', `sexp', `defun', `filename', `url',
+`word', `sentence', `whitespace', `line', `page' and others.
+
+See the file `thingatpt.el' for documentation on how to define
+a symbol as a valid THING."
+ (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
-(defun beginning-of-thing (THING)
- (let ((bounds (bounds-of-thing-at-point THING)))
- (or bounds (error "No %s here" THING))
+(defun beginning-of-thing (thing)
+ (let ((bounds (bounds-of-thing-at-point thing)))
+ (or bounds (error "No %s here" thing))
(goto-char (car bounds))))
-(defun end-of-thing (THING)
- (let ((bounds (bounds-of-thing-at-point THING)))
- (or bounds (error "No %s here" THING))
+(defun end-of-thing (thing)
+ (let ((bounds (bounds-of-thing-at-point thing)))
+ (or bounds (error "No %s here" thing))
(goto-char (cdr bounds))))
;; Special cases
(put 'sexp 'end-op 'end-of-sexp)
+(defun beginning-of-sexp ()
+ (let ((char-syntax (char-syntax (char-before (point)))))
+ (if (or (eq char-syntax ?\()
+ (and (eq char-syntax ?\") (in-string-p)))
+ (forward-char -1)
+ (forward-sexp -1))))
+
+(put 'sexp 'beginning-op 'beginning-of-sexp)
+
;; Lists
(put 'list 'end-op (function (lambda () (up-list 1))))
(put 'list 'beginning-op 'backward-sexp)
-;; Filenames
+;; Filenames and URLs
-(defvar file-name-chars "~/A-Za-z0-9---_.${}#%,"
+(defvar thing-at-point-file-name-chars "~/A-Za-z0-9---_.${}#%,:"
"Characters allowable in filenames.")
(put 'filename 'end-op
- (function (lambda () (skip-chars-forward file-name-chars))))
+ (lambda () (skip-chars-forward thing-at-point-file-name-chars)))
(put 'filename 'beginning-op
- (function (lambda () (skip-chars-backward file-name-chars (point-min)))))
+ (lambda () (skip-chars-backward thing-at-point-file-name-chars)))
+
+(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 will be prepended if
+absent: \"mailto:\" if the string contains \"@\", \"ftp://\" if it
+starts with \"ftp\" and not \"ftp:/\", or \"http://\" by default."
+
+ (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 "[ \t\n\r]+" url)
+ (setq url (replace-match "" t t url)))
+ (and short (setq url (concat (cond ((string-match "@" url)
+ "mailto:")
+ ;; e.g. ftp.swiss... or ftp-swiss...
+ ((string-match "^ftp" url)
+ "ftp://")
+ (t "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)))))
+
+(put 'url 'end-op
+ (function (lambda ()
+ (let ((bounds (thing-at-point-bounds-of-url-at-point)))
+ (if bounds
+ (goto-char (cdr bounds))
+ (error "No URL here"))))))
+(put 'url 'beginning-op
+ (function (lambda ()
+ (let ((bounds (thing-at-point-bounds-of-url-at-point)))
+ (if bounds
+ (goto-char (car bounds))
+ (error "No URL here"))))))
;; Whitespace
-(defun forward-whitespace (ARG)
+(defun forward-whitespace (arg)
(interactive "p")
- (if (natnump ARG)
- (re-search-forward "[ \t]+\\|\n" nil nil ARG)
- (while (< ARG 0)
- (if (re-search-backward "[ \t]+\\|\n" nil nil)
+ (if (natnump arg)
+ (re-search-forward "[ \t]+\\|\n" nil 'move arg)
+ (while (< arg 0)
+ (if (re-search-backward "[ \t]+\\|\n" nil 'move)
(or (eq (char-after (match-beginning 0)) 10)
(skip-chars-backward " \t")))
- (setq ARG (1+ ARG)))))
+ (setq arg (1+ arg)))))
;; Buffer
-(put 'buffer 'end-op 'end-of-buffer)
-(put 'buffer 'beginning-op 'beginning-of-buffer)
+(put 'buffer 'end-op (lambda () (goto-char (point-max))))
+(put 'buffer 'beginning-op (lambda () (goto-char (point-min))))
;; Symbols
-(defun forward-symbol (ARG)
+(defun forward-symbol (arg)
(interactive "p")
- (if (natnump ARG)
- (re-search-forward "\\(\\sw\\|\\s_\\)+" nil nil ARG)
- (while (< ARG 0)
- (if (re-search-backward "\\(\\sw\\|\\s_\\)+" nil nil)
+ (if (natnump arg)
+ (re-search-forward "\\(\\sw\\|\\s_\\)+" nil 'move arg)
+ (while (< arg 0)
+ (if (re-search-backward "\\(\\sw\\|\\s_\\)+" nil 'move)
(skip-syntax-backward "w_"))
- (setq ARG (1+ ARG)))))
+ (setq arg (1+ arg)))))
;; Syntax blocks
(defun word-at-point () (thing-at-point 'word))
(defun sentence-at-point () (thing-at-point 'sentence))
-(defun read-from-whole-string (STR)
- "Read a lisp expression from STR, signaling an error if the entire string
-was not used."
- (let* ((read-data (read-from-string STR))
+(defun read-from-whole-string (str)
+ "Read a lisp expression from STR.
+Signal an error if the entire string was not used."
+ (let* ((read-data (read-from-string str))
(more-left
(condition-case nil
- (progn (read-from-string (substring STR (cdr read-data)))
+ (progn (read-from-string (substring str (cdr read-data)))
t)
(end-of-file nil))))
(if more-left
(error "Can't read whole string")
(car read-data))))
-(defun form-at-point (&optional THING PRED)
+(defun form-at-point (&optional thing pred)
(let ((sexp (condition-case nil
- (read-from-whole-string (thing-at-point (or THING 'sexp)))
+ (read-from-whole-string (thing-at-point (or thing 'sexp)))
(error nil))))
- (if (or (not PRED) (funcall PRED sexp)) sexp)))
+ (if (or (not pred) (funcall pred sexp)) sexp)))
+;;;###autoload
(defun sexp-at-point () (form-at-point 'sexp))
+;;;###autoload
(defun symbol-at-point () (form-at-point 'sexp 'symbolp))
+;;;###autoload
(defun number-at-point () (form-at-point 'sexp 'numberp))
+;;;###autoload
(defun list-at-point () (form-at-point 'list 'listp))
;; thingatpt.el ends here.
HCoop / bpt / emacs.git / blobdiff