1 ;; xref.el --- Cross-referencing commands -*-lexical-binding:t-*-
3 ;; Copyright (C) 2014-2015 Free Software Foundation, Inc.
5 ;; This file is part of GNU Emacs.
7 ;; GNU Emacs is free software: you can redistribute it and/or modify
8 ;; it under the terms of the GNU General Public License as published by
9 ;; the Free Software Foundation, either version 3 of the License, or
10 ;; (at your option) any later version.
12 ;; GNU Emacs is distributed in the hope that it will be useful,
13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 ;; GNU General Public License for more details.
17 ;; You should have received a copy of the GNU General Public License
18 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
22 ;; This file provides a somewhat generic infrastructure for cross
23 ;; referencing commands, in particular "find-definition".
25 ;; Some part of the functionality must be implemented in a language
26 ;; dependent way and that's done by defining `xref-find-function',
27 ;; `xref-identifier-at-point-function' and
28 ;; `xref-identifier-completion-table-function', which see.
30 ;; A major mode should make these variables buffer-local first.
32 ;; `xref-find-function' can be called in several ways, see its
33 ;; description. It has to operate with "xref" and "location" values.
35 ;; One would usually call `make-xref' and `xref-make-file-location',
36 ;; `xref-make-buffer-location' or `xref-make-bogus-location' to create
37 ;; them. More generally, a location must be an instance of an EIEIO
38 ;; class inheriting from `xref-location' and implementing
39 ;; `xref-location-group' and `xref-location-marker'.
41 ;; Each identifier must be represented as a string. Implementers can
42 ;; use string properties to store additional information about the
43 ;; identifier, but they should keep in mind that values returned from
44 ;; `xref-identifier-completion-table-function' should still be
45 ;; distinct, because the user can't see the properties when making the
48 ;; See the functions `etags-xref-find' and `elisp-xref-find' for full
58 (defgroup xref nil "Cross-referencing commands"
64 (defclass xref-location () ()
65 :documentation "A location represents a position in a file or buffer.")
67 ;; If a backend decides to subclass xref-location it can provide
68 ;; methods for some of the following functions:
69 (cl-defgeneric xref-location-marker (location)
70 "Return the marker for LOCATION.")
72 (cl-defgeneric xref-location-group (location)
73 "Return a string used to group a set of locations.
74 This is typically the filename.")
76 (cl-defgeneric xref-location-line (_location)
77 "Return the line number corresponding to the location."
80 ;;;; Commonly needed location classes are defined here:
82 ;; FIXME: might be useful to have an optional "hint" i.e. a string to
83 ;; search for in case the line number is sightly out of date.
84 (defclass xref-file-location (xref-location)
85 ((file :type string :initarg :file)
86 (line :type fixnum :initarg :line :reader xref-location-line)
87 (column :type fixnum :initarg :column))
88 :documentation "A file location is a file/line/column triple.
89 Line numbers start from 1 and columns from 0.")
91 (defun xref-make-file-location (file line column)
92 "Create and return a new xref-file-location."
93 (make-instance 'xref-file-location :file file :line line :column column))
95 (cl-defmethod xref-location-marker ((l xref-file-location))
96 (with-slots (file line column) l
98 (or (get-file-buffer file)
99 (let ((find-file-suppress-same-file-warnings t))
100 (find-file-noselect file)))
104 (goto-char (point-min))
105 (beginning-of-line line)
106 (move-to-column column)
109 (cl-defmethod xref-location-group ((l xref-file-location))
112 (defclass xref-buffer-location (xref-location)
113 ((buffer :type buffer :initarg :buffer)
114 (position :type fixnum :initarg :position)))
116 (defun xref-make-buffer-location (buffer position)
117 "Create and return a new xref-buffer-location."
118 (make-instance 'xref-buffer-location :buffer buffer :position position))
120 (cl-defmethod xref-location-marker ((l xref-buffer-location))
121 (with-slots (buffer position) l
122 (let ((m (make-marker)))
123 (move-marker m position buffer))))
125 (cl-defmethod xref-location-group ((l xref-buffer-location))
126 (with-slots (buffer) l
127 (or (buffer-file-name buffer)
128 (format "(buffer %s)" (buffer-name buffer)))))
130 (defclass xref-bogus-location (xref-location)
131 ((message :type string :initarg :message
132 :reader xref-bogus-location-message))
133 :documentation "Bogus locations are sometimes useful to
134 indicate errors, e.g. when we know that a function exists but the
135 actual location is not known.")
137 (defun xref-make-bogus-location (message)
138 "Create and return a new xref-bogus-location."
139 (make-instance 'xref-bogus-location :message message))
141 (cl-defmethod xref-location-marker ((l xref-bogus-location))
142 (user-error "%s" (oref l :message)))
144 (cl-defmethod xref-location-group ((_ xref-bogus-location)) "(No location)")
146 ;; This should be in elisp-mode.el, but it's preloaded, and we can't
147 ;; preload defclass and defmethod (at least, not yet).
148 (defclass xref-elisp-location (xref-location)
149 ((symbol :type symbol :initarg :symbol)
150 (type :type symbol :initarg :type)
151 (file :type string :initarg :file
152 :reader xref-location-group))
153 :documentation "Location of an Emacs Lisp symbol definition.")
155 (defun xref-make-elisp-location (symbol type file)
156 (make-instance 'xref-elisp-location :symbol symbol :type type :file file))
158 (cl-defmethod xref-location-marker ((l xref-elisp-location))
159 (with-slots (symbol type file) l
162 (`defun (find-function-search-for-symbol symbol nil file))
163 ((or `defvar `defface)
164 (find-function-search-for-symbol symbol type file))
166 (cons (find-file-noselect file) 1)))))
167 (with-current-buffer (car buffer-point)
168 (goto-char (or (cdr buffer-point) (point-min)))
174 (defclass xref--xref ()
175 ((description :type string :initarg :description
176 :reader xref--xref-description)
177 (location :type xref-location :initarg :location
178 :reader xref--xref-location))
179 :comment "An xref is used to display and locate constructs like
180 variables or functions.")
182 (defun xref-make (description location)
183 "Create and return a new xref.
184 DESCRIPTION is a short string to describe the xref.
185 LOCATION is an `xref-location'."
186 (make-instance 'xref--xref :description description :location location))
191 (declare-function etags-xref-find "etags" (action id))
192 (declare-function tags-lazy-completion-table "etags" ())
194 ;; For now, make the etags backend the default.
195 (defvar xref-find-function #'etags-xref-find
196 "Function to look for cross-references.
197 It can be called in several ways:
199 (definitions IDENTIFIER): Find definitions of IDENTIFIER. The
200 result must be a list of xref objects. If no definitions can be
203 (references IDENTIFIER): Find references of IDENTIFIER. The
204 result must be a list of xref objects. If no references can be
207 (apropos PATTERN): Find all symbols that match PATTERN. PATTERN
210 (matches REGEXP): Find all matches for REGEXP in the related
211 files. REGEXP is an Emacs regular expression.
213 IDENTIFIER can be any string returned by
214 `xref-identifier-at-point-function', or from the table returned
215 by `xref-identifier-completion-table-function'.
217 To create an xref object, call `xref-make'.")
219 (defvar xref-identifier-at-point-function #'xref-default-identifier-at-point
220 "Function to get the relevant identifier at point.
222 The return value must be a string or nil. nil means no
223 identifier at point found.
225 If it's hard to determine the identifier precisely (e.g., because
226 it's a method call on unknown type), the implementation can
227 return a simple string (such as symbol at point) marked with a
228 special text property which `xref-find-function' would recognize
229 and then delegate the work to an external process.")
231 (defvar xref-identifier-completion-table-function #'tags-lazy-completion-table
232 "Function that returns the completion table for identifiers.")
234 (defun xref-default-identifier-at-point ()
235 (let ((thing (thing-at-point 'symbol)))
236 (and thing (substring-no-properties thing))))
240 (defun xref--alistify (list key test)
241 "Partition the elements of LIST into an alist.
242 KEY extracts the key from an element and TEST is used to compare
246 (let* ((k (funcall key e))
247 (probe (cl-assoc k alist :test test)))
249 (setcdr probe (cons e (cdr probe)))
250 (push (cons k (list e)) alist))))
251 ;; Put them back in order.
252 (cl-loop for (key . value) in (reverse alist)
253 collect (cons key (reverse value)))))
255 (defun xref--insert-propertized (props &rest strings)
256 "Insert STRINGS with text properties PROPS."
257 (let ((start (point)))
258 (apply #'insert strings)
259 (add-text-properties start (point) props)))
261 (defun xref--search-property (property &optional backward)
262 "Search the next text range where text property PROPERTY is non-nil.
263 Return the value of PROPERTY. If BACKWARD is non-nil, search
265 (let ((next (if backward
266 #'previous-single-char-property-change
267 #'next-single-char-property-change))
271 (goto-char (funcall next (point) property))
272 (not (or (setq value (get-text-property (point) property))
276 (t (goto-char start) nil))))
279 ;;; Marker stack (M-. pushes, M-, pops)
281 (defcustom xref-marker-ring-length 16
282 "Length of the xref marker ring."
286 (defcustom xref-prompt-for-identifier nil
287 "When non-nil, always prompt for the identifier name.
289 Otherwise, only prompt when there's no value at point we can use,
290 or when the command has been called with the prefix argument."
291 :type '(choice (const :tag "always" t)
292 (const :tag "auto" nil))
295 (defcustom xref-pulse-on-jump t
296 "When non-nil, momentarily highlight jump locations."
300 (defvar xref--marker-ring (make-ring xref-marker-ring-length)
301 "Ring of markers to implement the marker stack.")
303 (defun xref-push-marker-stack (&optional m)
304 "Add point M (defaults to `point-marker') to the marker stack."
305 (ring-insert xref--marker-ring (or m (point-marker))))
308 (defun xref-pop-marker-stack ()
309 "Pop back to where \\[xref-find-definitions] was last invoked."
311 (let ((ring xref--marker-ring))
312 (when (ring-empty-p ring)
313 (error "Marker stack is empty"))
314 (let ((marker (ring-remove ring 0)))
315 (switch-to-buffer (or (marker-buffer marker)
316 (error "The marked buffer has been deleted")))
317 (goto-char (marker-position marker))
318 (set-marker marker nil nil)
319 (xref--maybe-pulse))))
321 (defun xref--maybe-pulse ()
322 (when xref-pulse-on-jump
325 (back-to-indentation)
327 (setq beg (line-beginning-position)
330 end (line-end-position))))
331 (pulse-momentary-highlight-region beg end 'next-error))))
333 ;; etags.el needs this
334 (defun xref-clear-marker-stack ()
335 "Discard all markers from the marker stack."
336 (let ((ring xref--marker-ring))
337 (while (not (ring-empty-p ring))
338 (let ((marker (ring-remove ring)))
339 (set-marker marker nil nil)))))
342 (defun xref-marker-stack-empty-p ()
343 "Return t if the marker stack is empty; nil otherwise."
344 (ring-empty-p xref--marker-ring))
347 (defun xref--goto-location (location)
348 "Set buffer and point according to xref-location LOCATION."
349 (let ((marker (xref-location-marker location)))
350 (set-buffer (marker-buffer marker))
351 (cond ((and (<= (point-min) marker) (<= marker (point-max))))
352 (widen-automatically (widen))
353 (t (error "Location is outside accessible part of buffer")))
356 (defun xref--pop-to-location (location &optional window)
357 "Goto xref-location LOCATION and display the buffer.
358 WINDOW controls how the buffer is displayed:
359 nil -- switch-to-buffer
360 'window -- pop-to-buffer (other window)
361 'frame -- pop-to-buffer (other frame)"
362 (xref--goto-location location)
364 ((nil) (switch-to-buffer (current-buffer)))
365 (window (pop-to-buffer (current-buffer) t))
366 (frame (let ((pop-up-frames t)) (pop-to-buffer (current-buffer) t))))
370 ;;; XREF buffer (part of the UI)
372 ;; The xref buffer is used to display a set of xrefs.
374 (defvar-local xref--display-history nil
375 "List of pairs (BUFFER . WINDOW), for temporarily displayed buffers.")
377 (defvar-local xref--temporary-buffers nil
378 "List of buffers created by xref code.")
380 (defvar-local xref--current nil
381 "Non-nil if this buffer was once current, except while displaying xrefs.
382 Used for temporary buffers.")
384 (defvar xref--inhibit-mark-current nil)
386 (defun xref--mark-selected ()
387 (unless xref--inhibit-mark-current
388 (setq xref--current t))
389 (remove-hook 'buffer-list-update-hook #'xref--mark-selected t))
391 (defun xref--save-to-history (buf win)
392 (let ((restore (window-parameter win 'quit-restore)))
393 ;; Save the new entry if the window displayed another buffer
395 (when (and restore (not (eq (car restore) 'same)))
396 (push (cons buf win) xref--display-history))))
398 (defun xref--display-position (pos other-window recenter-arg xref-buf)
399 ;; Show the location, but don't hijack focus.
400 (with-selected-window (display-buffer (current-buffer) other-window)
402 (recenter recenter-arg)
404 (let ((buf (current-buffer))
405 (win (selected-window)))
406 (with-current-buffer xref-buf
407 (setq-local other-window-scroll-buffer buf)
408 (xref--save-to-history buf win)))))
410 (defun xref--show-location (location)
412 (let ((xref-buf (current-buffer))
414 (xref--inhibit-mark-current t))
415 (xref--goto-location location)
416 (let ((buf (current-buffer)))
417 (unless (memq buf bl)
419 (add-hook 'buffer-list-update-hook #'xref--mark-selected nil t)
420 (with-current-buffer xref-buf
421 (push buf xref--temporary-buffers))))
422 (xref--display-position (point) t 1 xref-buf))
423 (user-error (message (error-message-string err)))))
425 (defun xref-show-location-at-point ()
426 "Display the source of xref at point in the other window, if any."
428 (let ((loc (xref--location-at-point)))
430 (xref--show-location loc))))
432 (defun xref-next-line ()
433 "Move to the next xref and display its source in the other window."
435 (xref--search-property 'xref-location)
436 (xref-show-location-at-point))
438 (defun xref-prev-line ()
439 "Move to the previous xref and display its source in the other window."
441 (xref--search-property 'xref-location t)
442 (xref-show-location-at-point))
444 (defun xref--location-at-point ()
446 (back-to-indentation)
447 (get-text-property (point) 'xref-location)))
449 (defvar-local xref--window nil
450 "ACTION argument to call `display-buffer' with.")
452 (defun xref-goto-xref ()
453 "Jump to the xref on the current line and bury the xref buffer."
455 (let ((loc (or (xref--location-at-point)
456 (user-error "No reference at point")))
457 (window xref--window))
459 (xref--pop-to-location loc window)))
461 (defvar xref--xref-buffer-mode-map
462 (let ((map (make-sparse-keymap)))
463 (define-key map [remap quit-window] #'xref-quit)
464 (define-key map (kbd "n") #'xref-next-line)
465 (define-key map (kbd "p") #'xref-prev-line)
466 (define-key map (kbd "RET") #'xref-goto-xref)
467 (define-key map (kbd "C-o") #'xref-show-location-at-point)
468 ;; suggested by Johan Claesson "to further reduce finger movement":
469 (define-key map (kbd ".") #'xref-next-line)
470 (define-key map (kbd ",") #'xref-prev-line)
473 (define-derived-mode xref--xref-buffer-mode special-mode "XREF"
474 "Mode for displaying cross-references."
475 (setq buffer-read-only t)
476 (setq next-error-function #'xref--next-error-function)
477 (setq next-error-last-buffer (current-buffer)))
479 (defun xref--next-error-function (n reset?)
481 (goto-char (point-min)))
482 (let ((backward (< n 0))
486 (setq loc (xref--search-property 'xref-location backward)))
488 (xref--pop-to-location loc))
490 (error "No %s xref" (if backward "previous" "next"))))))
492 (defun xref-quit (&optional kill)
493 "Bury temporarily displayed buffers, then quit the current window.
495 If KILL is non-nil, kill all buffers that were created in the
496 process of showing xrefs, and also kill the current buffer.
498 The buffers that the user has otherwise interacted with in the
499 meantime are preserved."
501 (let ((window (selected-window))
502 (history xref--display-history))
503 (setq xref--display-history nil)
504 (pcase-dolist (`(,buf . ,win) history)
505 (when (and (window-live-p win)
506 (eq buf (window-buffer win)))
507 (quit-window nil win)))
509 (let ((xref--inhibit-mark-current t)
510 kill-buffer-query-functions)
511 (dolist (buf xref--temporary-buffers)
512 (unless (buffer-local-value 'xref--current buf)
514 (setq xref--temporary-buffers nil)))
515 (quit-window kill window)))
517 (defconst xref-buffer-name "*xref*"
518 "The name of the buffer to show xrefs.")
520 (defvar xref--button-map
521 (let ((map (make-sparse-keymap)))
522 (define-key map [(control ?m)] #'xref-goto-xref)
523 (define-key map [mouse-1] #'xref-goto-xref)
524 (define-key map [mouse-2] #'xref--mouse-2)
527 (defun xref--mouse-2 (event)
528 "Move point to the button and show the xref definition."
530 (mouse-set-point event)
532 (xref--search-property 'xref-location)
533 (xref-show-location-at-point))
535 (defun xref--insert-xrefs (xref-alist)
536 "Insert XREF-ALIST in the current-buffer.
537 XREF-ALIST is of the form ((GROUP . (XREF ...)) ...). Where
538 GROUP is a string for decoration purposes and XREF is an
539 `xref--xref' object."
540 (require 'compile) ; For the compilation faces.
541 (cl-loop for ((group . xrefs) . more1) on xref-alist
543 (cl-loop for xref in xrefs
544 maximize (let ((line (xref-location-line
545 (oref xref :location))))
546 (length (and line (format "%d" line)))))
547 for line-format = (and max-line-width
548 (format "%%%dd: " max-line-width))
550 (xref--insert-propertized '(face compilation-info) group "\n")
551 (cl-loop for (xref . more2) on xrefs do
552 (with-slots (description location) xref
553 (let* ((line (xref-location-line location))
556 (propertize (format line-format line)
557 'face 'compilation-line-number)
559 (xref--insert-propertized
560 (list 'xref-location location
561 ;; 'face 'font-lock-keyword-face
562 'mouse-face 'highlight
563 'keymap xref--button-map
565 (concat "mouse-2: display in another window, "
566 "RET or mouse-1: follow reference"))
567 prefix description)))
570 (defun xref--analyze (xrefs)
571 "Find common filenames in XREFS.
572 Return an alist of the form ((FILENAME . (XREF ...)) ...)."
573 (xref--alistify xrefs
575 (xref-location-group (xref--xref-location x)))
578 (defun xref--show-xref-buffer (xrefs alist)
579 (let ((xref-alist (xref--analyze xrefs)))
580 (with-current-buffer (get-buffer-create xref-buffer-name)
581 (let ((inhibit-read-only t))
583 (xref--insert-xrefs xref-alist)
584 (xref--xref-buffer-mode)
585 (pop-to-buffer (current-buffer))
586 (goto-char (point-min))
587 (setq xref--window (assoc-default 'window alist))
588 (setq xref--temporary-buffers (assoc-default 'temporary-buffers alist))
589 (dolist (buf xref--temporary-buffers)
590 (with-current-buffer buf
591 (add-hook 'buffer-list-update-hook #'xref--mark-selected nil t)))
595 ;; This part of the UI seems fairly uncontroversial: it reads the
596 ;; identifier and deals with the single definition case.
598 ;; The controversial multiple definitions case is handed off to
599 ;; xref-show-xrefs-function.
601 (defvar xref-show-xrefs-function 'xref--show-xref-buffer
602 "Function to display a list of xrefs.")
604 (defvar xref--read-identifier-history nil)
606 (defvar xref--read-pattern-history nil)
608 (defun xref--show-xrefs (input kind arg window)
609 (let* ((bl (buffer-list))
610 (xrefs (funcall xref-find-function kind arg))
611 (tb (cl-set-difference (buffer-list) bl)))
614 (user-error "No known %s for: %s" (symbol-name kind) input))
616 (xref-push-marker-stack)
617 (xref--pop-to-location (xref--xref-location (car xrefs)) window))
619 (xref-push-marker-stack)
620 (funcall xref-show-xrefs-function xrefs
622 (temporary-buffers . ,tb)))))))
624 (defun xref--read-identifier (prompt)
625 "Return the identifier at point or read it from the minibuffer."
626 (let ((id (funcall xref-identifier-at-point-function)))
627 (cond ((or current-prefix-arg xref-prompt-for-identifier (not id))
628 (completing-read prompt
629 (funcall xref-identifier-completion-table-function)
631 'xref--read-identifier-history id))
637 (defun xref--find-definitions (id window)
638 (xref--show-xrefs id 'definitions id window))
641 (defun xref-find-definitions (identifier)
642 "Find the definition of the identifier at point.
643 With prefix argument or when there's no identifier at point,
645 (interactive (list (xref--read-identifier "Find definitions of: ")))
646 (xref--find-definitions identifier nil))
649 (defun xref-find-definitions-other-window (identifier)
650 "Like `xref-find-definitions' but switch to the other window."
651 (interactive (list (xref--read-identifier "Find definitions of: ")))
652 (xref--find-definitions identifier 'window))
655 (defun xref-find-definitions-other-frame (identifier)
656 "Like `xref-find-definitions' but switch to the other frame."
657 (interactive (list (xref--read-identifier "Find definitions of: ")))
658 (xref--find-definitions identifier 'frame))
661 (defun xref-find-references (identifier)
662 "Find references to the identifier at point.
663 With prefix argument, prompt for the identifier."
664 (interactive (list (xref--read-identifier "Find references of: ")))
665 (xref--show-xrefs identifier 'references identifier nil))
668 (defun xref-find-regexp (regexp)
669 "Find all matches for REGEXP."
670 (interactive (list (xref--read-identifier "Find regexp: ")))
671 (xref--show-xrefs regexp 'matches regexp nil))
673 (declare-function apropos-parse-pattern "apropos" (pattern))
676 (defun xref-find-apropos (pattern)
677 "Find all meaningful symbols that match PATTERN.
678 The argument has the same meaning as in `apropos'."
679 (interactive (list (read-string
680 "Search for pattern (word list or regexp): "
681 nil 'xref--read-pattern-history)))
683 (xref--show-xrefs pattern 'apropos
684 (apropos-parse-pattern
685 (if (string-equal (regexp-quote pattern) pattern)
687 (or (split-string pattern "[ \t]+" t)
688 (user-error "No word list given"))
695 ;;;###autoload (define-key esc-map "." #'xref-find-definitions)
696 ;;;###autoload (define-key esc-map "," #'xref-pop-marker-stack)
697 ;;;###autoload (define-key esc-map [?\C-.] #'xref-find-apropos)
698 ;;;###autoload (define-key ctl-x-4-map "." #'xref-find-definitions-other-window)
699 ;;;###autoload (define-key ctl-x-5-map "." #'xref-find-definitions-other-frame)
704 (defvar xref-etags-mode--saved nil)
706 (define-minor-mode xref-etags-mode
707 "Minor mode to make xref use etags again.
709 Certain major modes install their own mechanisms for listing
710 identifiers and navigation. Turn this on to undo those settings
715 (setq xref-etags-mode--saved
716 (cons xref-find-function
717 xref-identifier-completion-table-function))
718 (kill-local-variable 'xref-find-function)
719 (kill-local-variable 'xref-identifier-completion-table-function))
720 (setq-local xref-find-function (car xref-etags-mode--saved))
721 (setq-local xref-identifier-completion-table-function
722 (cdr xref-etags-mode--saved))))
724 (declare-function semantic-symref-find-references-by-name "semantic/symref")
725 (declare-function semantic-symref-find-text "semantic/symref")
726 (declare-function semantic-find-file-noselect "semantic/fw")
728 (defun xref-collect-matches (input dir &optional kind)
729 "Collect KIND matches for INPUT inside DIR according.
730 KIND can be `symbol', `regexp' or nil, the last of which means
731 literal matches. This function uses the Semantic Symbol
732 Reference API, see `semantic-symref-find-references-by-name' for
733 details on which tools are used, and when."
734 (require 'semantic/symref)
735 (defvar semantic-symref-tool)
736 (cl-assert (directory-name-p dir))
738 (setq input (regexp-quote input)))
739 (let* ((default-directory dir)
740 (semantic-symref-tool 'detect)
741 (res (if (eq kind 'symbol)
742 (semantic-symref-find-references-by-name input 'subdirs)
743 (semantic-symref-find-text (xref--regexp-to-extended input)
745 (hits (and res (oref res :hit-lines)))
746 (orig-buffers (buffer-list)))
749 (mapcar (lambda (hit) (xref--collect-match hit input kind)) hits))
751 (cl-set-difference (buffer-list) orig-buffers)))))
753 (defun xref--regexp-to-extended (str)
754 (replace-regexp-in-string
755 ;; FIXME: Add tests. Move to subr.el, make a public function.
756 ;; Maybe error on Emacs-only constructs.
757 "\\(?:\\\\\\\\\\)*\\(?:\\\\[][]\\)?\\(?:\\[.+?\\]\\|\\(\\\\?[(){}|]\\)\\)"
760 ((not (match-beginning 1))
762 ((eq (length (match-string 1 str)) 2)
763 (concat (substring str 0 (match-beginning 1))
764 (substring (match-string 1 str) 1 2)))
766 (concat (substring str 0 (match-beginning 1))
768 (match-string 1 str)))))
771 (defun xref--collect-match (hit input kind)
772 (pcase-let* ((`(,line . ,file) hit)
773 (buf (or (find-buffer-visiting file)
774 (semantic-find-file-noselect file)))
775 (input (if (eq kind 'symbol)
776 (format "\\_<%s\\_>" (regexp-quote input))
778 (with-current-buffer buf
780 (goto-char (point-min))
781 (forward-line (1- line))
782 (when (re-search-forward input (line-end-position) t)
783 (goto-char (match-beginning 0))
784 (xref-make (buffer-substring
785 (line-beginning-position)
787 (xref-make-file-location file line
788 (current-column))))))))
793 ;;; xref.el ends here