(provide 'thingatpt)
(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 (functionp forward-op)
(funcall forward-op (or n 1))
(error "Can't determine how to move over a %s" thing))))
(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
(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)))
(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)
(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)))))
(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))))))
(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))
(goto-char (cdr bounds))))
(put 'line 'beginning-op
(function (lambda () (if (bolp) (forward-line -1) (beginning-of-line)))))
(defun in-string-p ()
(let ((orig (point)))
(save-excursion
(beginning-of-defun)
(nth 3 (parse-partial-sexp (point) orig)))))
(defun end-of-sexp ()
(let ((char-syntax (char-syntax (char-after (point)))))
(if (or (eq char-syntax ?\))
(and (eq char-syntax ?\") (in-string-p)))
(forward-char 1)
(forward-sexp 1))))
(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 and URLs
(defvar thing-at-point-file-name-chars "~/A-Za-z0-9---_.${}#%,:"
"Characters allowable in filenames.")
(put 'filename 'end-op
(lambda () (skip-chars-forward thing-at-point-file-name-chars)))
(put 'filename 'beginning-op
(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)
(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)
(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))) (while (string-match "[ \t\n\r]+" url)
(setq url (replace-match "" t t url)))
(and short (setq url (concat (cond ((string-match "@" url)
"mailto:")
((string-match "^ftp" url)
"ftp://")
(t "http://"))
url)))
(if (string-equal "" url)
nil
url)))))
(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)))
(re-search-forward regexp nil 'limit)
(while (and (re-search-backward regexp nil t)
(or (> (match-beginning 0) old-point)
(and (looking-at regexp) (>= (match-end 0) old-point)
(setq match (point))))))
(if (not match) nil
(goto-char match)
(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"))))))
(defun forward-whitespace (arg)
(interactive "p")
(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)))))
(put 'buffer 'end-op (lambda () (goto-char (point-max))))
(put 'buffer 'beginning-op (lambda () (goto-char (point-min))))
(defun forward-symbol (arg)
(interactive "p")
(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)))))
(defun forward-same-syntax (&optional arg)
(interactive "p")
(while (< arg 0)
(skip-syntax-backward
(char-to-string (char-syntax (char-after (1- (point))))))
(setq arg (1+ arg)))
(while (> arg 0)
(skip-syntax-forward (char-to-string (char-syntax (char-after (point)))))
(setq arg (1- arg))))
(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.
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)))
t)
(end-of-file nil))))
(if more-left
(error "Can't read whole string")
(car read-data))))
(defun form-at-point (&optional thing pred)
(let ((sexp (condition-case nil
(read-from-whole-string (thing-at-point (or thing 'sexp)))
(error nil))))
(if (or (not pred) (funcall pred sexp)) sexp)))
(defun sexp-at-point () (form-at-point 'sexp))
(defun symbol-at-point () (form-at-point 'sexp 'symbolp))
(defun number-at-point () (form-at-point 'sexp 'numberp))
(defun list-at-point () (form-at-point 'list 'listp))