1 ;;; yasnippet.el --- Yet another snippet extension for Emacs.
3 ;; Copyright (C) 2008-2013, 2015 Free Software Foundation, Inc.
4 ;; Authors: pluskid <pluskid@gmail.com>, João Távora <joaotavora@gmail.com>
5 ;; Maintainer: João Távora <joaotavora@gmail.com>
7 ;; Package-version: 0.8.0
8 ;; X-URL: http://github.com/capitaomorte/yasnippet
9 ;; Keywords: convenience, emulation
10 ;; URL: http://github.com/capitaomorte/yasnippet
11 ;; EmacsWiki: YaSnippetMode
13 ;; This program is free software: you can redistribute it and/or modify
14 ;; it under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation, either version 3 of the License, or
16 ;; (at your option) any later version.
18 ;; This program is distributed in the hope that it will be useful,
19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ;; GNU General Public License for more details.
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with this program. If not, see <http://www.gnu.org/licenses/>.
28 ;; Basic steps to setup:
30 ;; (add-to-list 'load-path
31 ;; "~/path-to-yasnippet")
32 ;; (require 'yasnippet)
33 ;; (yas-global-mode 1)
36 ;; Interesting variables are:
40 ;; The directory where user-created snippets are to be
41 ;; stored. Can also be a list of directories. In that case,
42 ;; when used for bulk (re)loading of snippets (at startup or
43 ;; via `yas-reload-all'), directories appearing earlier in
44 ;; the list override other dir's snippets. Also, the first
45 ;; directory is taken as the default for storing the user's
48 ;; The deprecated `yas/root-directory' aliases this variable
49 ;; for backward-compatibility.
52 ;; Major commands are:
56 ;; Try to expand snippets before point. In `yas-minor-mode',
57 ;; this is normally bound to TAB, but you can customize it in
58 ;; `yas-minor-mode-map'.
60 ;; M-x yas-load-directory
62 ;; Prompts you for a directory hierarchy of snippets to load.
64 ;; M-x yas-activate-extra-mode
66 ;; Prompts you for an extra mode to add snippets for in the
69 ;; M-x yas-insert-snippet
71 ;; Prompts you for possible snippet expansion if that is
72 ;; possible according to buffer-local and snippet-local
73 ;; expansion conditions. With prefix argument, ignore these
76 ;; M-x yas-visit-snippet-file
78 ;; Prompts you for possible snippet expansions like
79 ;; `yas-insert-snippet', but instead of expanding it, takes
80 ;; you directly to the snippet definition's file, if it
83 ;; M-x yas-new-snippet
85 ;; Lets you create a new snippet file in the correct
86 ;; subdirectory of `yas-snippet-dirs', according to the
89 ;; M-x yas-load-snippet-buffer
91 ;; When editing a snippet, this loads the snippet. This is
92 ;; bound to "C-c C-c" while in the `snippet-mode' editing
95 ;; M-x yas-tryout-snippet
97 ;; When editing a snippet, this opens a new empty buffer,
98 ;; sets it to the appropriate major mode and inserts the
99 ;; snippet there, so you can see what it looks like. This is
100 ;; bound to "C-c C-t" while in `snippet-mode'.
102 ;; M-x yas-describe-tables
104 ;; Lists known snippets in a separate buffer. User is
105 ;; prompted as to whether only the currently active tables
106 ;; are to be displayed, or all the tables for all major
109 ;; If you have `dropdown-list' installed, you can optionally use it
110 ;; as the preferred "prompting method", putting in your .emacs file,
113 ;; (require 'dropdown-list)
114 ;; (setq yas-prompt-functions '(yas-dropdown-prompt
116 ;; yas-completing-prompt))
118 ;; Also check out the customization group
120 ;; M-x customize-group RET yasnippet RET
122 ;; If you use the customization group to set variables
123 ;; `yas-snippet-dirs' or `yas-global-mode', make sure the path to
124 ;; "yasnippet.el" is present in the `load-path' *before* the
125 ;; `custom-set-variables' is executed in your .emacs file.
127 ;; For more information and detailed usage, refer to the project page:
128 ;; http://github.com/capitaomorte/yasnippet
137 (defvar yas--editing-template)
138 (defvar yas--guessed-modes)
139 (defvar yas--indent-original-column)
140 (defvar yas--scheduled-jit-loads)
142 (defvar yas-selected-text)
143 (defvar yas-verbosity)
144 (defvar yas--current-template)
147 ;;; User customizable variables
149 (defgroup yasnippet nil
150 "Yet Another Snippet extension"
154 (defvar yas-installed-snippets-dir nil)
155 (setq yas-installed-snippets-dir
157 (concat (file-name-directory load-file-name) "snippets")))
159 (defcustom yas-snippet-dirs (remove nil
160 (list "~/.emacs.d/snippets"
161 'yas-installed-snippets-dir))
162 "List of top-level snippet directories.
164 Each element, a string or a symbol whose value is a string,
165 designates a top-level directory where per-mode snippet
166 directories can be found.
168 Elements appearing earlier in the list override later elements'
171 The first directory is taken as the default for storing snippet's
172 created with `yas-new-snippet'. "
173 :type '(choice (string :tag "Single directory (string)")
174 (repeat :args (string) :tag "List of directories (strings)"))
177 :set #'(lambda (symbol new)
178 (let ((old (and (boundp symbol)
179 (symbol-value symbol))))
180 (set-default symbol new)
181 (unless (or (not (fboundp 'yas-reload-all))
185 (defun yas-snippet-dirs ()
186 "Return variable `yas-snippet-dirs' as list of strings."
187 (cl-loop for e in (if (listp yas-snippet-dirs)
189 (list yas-snippet-dirs))
191 (cond ((stringp e) e)
194 (stringp (symbol-value e)))
197 (error "[yas] invalid element %s in `yas-snippet-dirs'" e)))))
199 (defvaralias 'yas/root-directory 'yas-snippet-dirs)
201 (defcustom yas-new-snippet-default "\
202 # -*- mode: snippet; require-final-newline: nil -*-
204 # key: ${2:${1:$(yas--key-from-desc yas-text)}}${3:
205 # binding: ${4:direct-keybinding}}
208 "Default snippet to use when creating a new snippet.
209 If nil, don't use any snippet."
213 (defcustom yas-prompt-functions '(yas-x-prompt
215 yas-completing-prompt
218 "Functions to prompt for keys, templates, etc interactively.
220 These functions are called with the following arguments:
222 - PROMPT: A string to prompt the user
224 - CHOICES: a list of strings or objects.
226 - optional DISPLAY-FN : A function that, when applied to each of
227 the objects in CHOICES will return a string.
229 The return value of any function you put here should be one of
230 the objects in CHOICES, properly formatted with DISPLAY-FN (if
233 - To signal that your particular style of prompting is
234 unavailable at the moment, you can also have the function return
237 - To signal that the user quit the prompting process, you can
240 (signal 'quit \"user quit!\")."
241 :type '(repeat function)
244 (defcustom yas-indent-line 'auto
245 "Controls indenting applied to a recent snippet expansion.
247 The following values are possible:
249 - `fixed' Indent the snippet to the current column;
251 - `auto' Indent each line of the snippet with `indent-according-to-mode'
253 Every other value means don't apply any snippet-side indentation
254 after expansion (the manual per-line \"$>\" indentation still
256 :type '(choice (const :tag "Nothing" nothing)
257 (const :tag "Fixed" fixed)
258 (const :tag "Auto" auto))
261 (defcustom yas-also-auto-indent-first-line nil
262 "Non-nil means also auto indent first line according to mode.
264 Naturally this is only valid when `yas-indent-line' is `auto'"
268 (defcustom yas-snippet-revival t
269 "Non-nil means re-activate snippet fields after undo/redo."
273 (defcustom yas-triggers-in-field nil
274 "If non-nil, allow stacked expansions (snippets inside snippets).
276 Otherwise `yas-next-field-or-maybe-expand' just moves on to the
281 (defcustom yas-fallback-behavior 'call-other-command
282 "How to act when `yas-expand' does *not* expand a snippet.
284 - `call-other-command' means try to temporarily disable YASnippet
285 and call the next command bound to whatever key was used to
288 - nil or the symbol `return-nil' mean do nothing. (and
289 `yas-expand' returns nil)
291 - A Lisp form (apply COMMAND . ARGS) means interactively call
292 COMMAND. If ARGS is non-nil, call COMMAND non-interactively
293 with ARGS as arguments."
294 :type '(choice (const :tag "Call previous command" call-other-command)
295 (const :tag "Do nothing" return-nil))
298 (defcustom yas-choose-keys-first nil
299 "If non-nil, prompt for snippet key first, then for template.
301 Otherwise prompts for all possible snippet names.
303 This affects `yas-insert-snippet' and `yas-visit-snippet-file'."
307 (defcustom yas-choose-tables-first nil
308 "If non-nil, and multiple eligible snippet tables, prompts user for tables first.
310 Otherwise, user chooses between the merging together of all
313 This affects `yas-insert-snippet', `yas-visit-snippet-file'"
317 (defcustom yas-use-menu 'abbreviate
318 "Display a YASnippet menu in the menu bar.
320 When non-nil, submenus for each snippet table will be listed
321 under the menu \"Yasnippet\".
323 - If set to `abbreviate', only the current major-mode
324 menu and the modes set in `yas--extra-modes' are listed.
326 - If set to `full', every submenu is listed
328 - If set to `nil', hide the menu.
330 Any other non-nil value, every submenu is listed."
331 :type '(choice (const :tag "Full" full)
332 (const :tag "Abbreviate" abbreviate)
333 (const :tag "No menu" nil))
336 (defcustom yas-trigger-symbol (or (and (eq window-system 'mac)
338 (char-to-string ?\x21E5))) ;; little ->| sign
340 "The text that will be used in menu to represent the trigger."
344 (defcustom yas-wrap-around-region nil
345 "If non-nil, snippet expansion wraps around selected region.
347 The wrapping occurs just before the snippet's exit marker. This
348 can be overridden on a per-snippet basis."
352 (defcustom yas-good-grace t
353 "If non-nil, don't raise errors in inline elisp evaluation.
355 An error string \"[yas] error\" is returned instead."
359 (defcustom yas-visit-from-menu nil
360 "If non-nil visit snippets's files from menu, instead of expanding them.
362 This can only work when snippets are loaded from files."
366 (defcustom yas-expand-only-for-last-commands nil
367 "List of `last-command' values to restrict tab-triggering to, or nil.
369 Leave this set at nil (the default) to be able to trigger an
370 expansion simply by placing the cursor after a valid tab trigger,
371 using whichever commands.
373 Optionally, set this to something like '(self-insert-command) if
374 you to wish restrict expansion to only happen when the last
375 letter of the snippet tab trigger was typed immediately before
376 the trigger key itself."
377 :type '(repeat function)
380 ;; Only two faces, and one of them shouldn't even be used...
382 (defface yas-field-highlight-face
383 '((t (:inherit 'region)))
384 "The face used to highlight the currently active field of a snippet"
387 (defface yas--field-debug-face
389 "The face used for debugging some overlays normally hidden"
393 ;;; User-visible variables
395 (defvar yas-keymap (let ((map (make-sparse-keymap)))
396 (define-key map [(tab)] 'yas-next-field-or-maybe-expand)
397 (define-key map (kbd "TAB") 'yas-next-field-or-maybe-expand)
398 (define-key map [(shift tab)] 'yas-prev-field)
399 (define-key map [backtab] 'yas-prev-field)
400 (define-key map (kbd "C-g") 'yas-abort-snippet)
401 (define-key map (kbd "C-d") 'yas-skip-and-clear-or-delete-char)
403 "The active keymap while a snippet expansion is in progress.")
405 (defvar yas-key-syntaxes (list "w" "w_" "w_." "w_.()"
406 #'yas-try-key-from-whitespace)
407 "Syntaxes and functions to help look for trigger keys before point.
409 Each element in this list specifies how to skip buffer positions
410 backwards and look for the start of a trigger key.
412 Each element can be either a string or a function receiving the
413 original point as an argument. A string element is simply passed
414 to `skip-syntax-backward' whereas a function element is called
415 with no arguments and should also place point before the original
418 The string between the resulting buffer position and the original
419 point is matched against the trigger keys in the active snippet
422 If no expandable snippets are found, the next element is the list
423 is tried, unless a function element returned the symbol `again',
424 in which case it is called again from the previous position and
425 may once more reposition point.
427 For example, if `yas-key-syntaxes'' value is '(\"w\" \"w_\"),
428 trigger keys composed exclusively of \"word\"-syntax characters
429 are looked for first. Failing that, longer keys composed of
430 \"word\" or \"symbol\" syntax are looked for. Therefore,
435 will, according to the \"w\" element first try \"barbaz\". If
436 that isn't a trigger key, \"foo-barbaz\" is tried, respecting the
437 second \"w_\" element. Notice that even if \"baz\" is a trigger
438 key for an active snippet, it won't be expanded, unless a
439 function is added to `yas-key-syntaxes' that eventually places
440 point between \"bar\" and \"baz\".
442 See also Info node `(elisp) Syntax Descriptors'.")
444 (defvar yas-after-exit-snippet-hook
446 "Hooks to run after a snippet exited.
448 The hooks will be run in an environment where some variables bound to
451 `yas-snippet-beg' : The beginning of the region of the snippet.
453 `yas-snippet-end' : Similar to beg.
455 Attention: These hooks are not run when exiting nested/stacked snippet expansion!")
457 (defvar yas-before-expand-snippet-hook
459 "Hooks to run just before expanding a snippet.")
461 (defvar yas-buffer-local-condition
462 '(if (and (or (fourth (syntax-ppss))
463 (fifth (syntax-ppss)))
465 (eq this-command 'yas-expand-from-trigger-key))
466 '(require-snippet-condition . force-in-comment)
468 "Snippet expanding condition.
470 This variable is a Lisp form which is evaluated every time a
471 snippet expansion is attempted:
473 * If it evaluates to nil, no snippets can be expanded.
475 * If it evaluates to the a cons (require-snippet-condition
478 * Snippets bearing no \"# condition:\" directive are not
481 * Snippets bearing conditions that evaluate to nil (or
482 produce an error) won't be considered.
484 * If the snippet has a condition that evaluates to non-nil
487 * If REQUIREMENT is t, the snippet is considered
489 * If REQUIREMENT is `eq' RESULT, the snippet is
492 * Otherwise, the snippet is not considered.
494 * If it evaluates to the symbol 'always, all snippets are
495 considered for expansion, regardless of any conditions.
497 * If it evaluates to t or some other non-nil value
499 * Snippet bearing no conditions, or conditions that
500 evaluate to non-nil, are considered for expansion.
502 * Otherwise, the snippet is not considered.
504 Here's an example preventing snippets from being expanded from
505 inside comments, in `python-mode' only, with the exception of
506 snippets returning the symbol 'force-in-comment in their
509 (add-hook 'python-mode-hook
511 (setq yas-buffer-local-condition
512 '(if (python-in-string/comment)
513 '(require-snippet-condition . force-in-comment)
516 The default value is similar, it filters out potential snippet
517 expansions inside comments and string literals, unless the
518 snippet itself contains a condition that returns the symbol
519 `force-in-comment'.")
522 ;;; Internal variables
524 (defvar yas--version "0.8.0beta")
526 (defvar yas--menu-table (make-hash-table)
527 "A hash table of MAJOR-MODE symbols to menu keymaps.")
529 (defvar yas--escaped-characters
530 '(?\\ ?` ?\" ?' ?$ ?} ?{ ?\( ?\))
531 "List of characters which *might* need to be escaped.")
533 (defconst yas--field-regexp
534 "${\\([0-9]+:\\)?\\([^}]*\\)}"
535 "A regexp to *almost* recognize a field.")
537 (defconst yas--multi-dollar-lisp-expression-regexp
538 "$+[ \t\n]*\\(([^)]*)\\)"
539 "A regexp to *almost* recognize a \"$(...)\" expression.")
541 (defconst yas--backquote-lisp-expression-regexp
543 "A regexp to recognize a \"`lisp-expression`\" expression." )
545 (defconst yas--transform-mirror-regexp
546 "${\\(?:\\([0-9]+\\):\\)?$\\([ \t\n]*([^}]*\\)"
547 "A regexp to *almost* recognize a mirror with a transform.")
549 (defconst yas--simple-mirror-regexp
551 "A regexp to recognize a simple mirror.")
553 (defvar yas--snippet-id-seed 0
554 "Contains the next id for a snippet.")
556 (defun yas--snippet-next-id ()
557 (let ((id yas--snippet-id-seed))
558 (cl-incf yas--snippet-id-seed)
564 ;; XXX: `last-buffer-undo-list' is somehow needed in Carbon Emacs for MacOSX
565 (defvar last-buffer-undo-list nil)
567 (defvar yas--minor-mode-menu nil
568 "Holds the YASnippet menu.")
570 (defvar yas-minor-mode-map
571 (let ((map (make-sparse-keymap)))
572 (define-key map [(tab)] 'yas-expand)
573 (define-key map (kbd "TAB") 'yas-expand)
574 (define-key map "\C-c&\C-s" 'yas-insert-snippet)
575 (define-key map "\C-c&\C-n" 'yas-new-snippet)
576 (define-key map "\C-c&\C-v" 'yas-visit-snippet-file)
578 "The keymap used when `yas-minor-mode' is active.")
580 (easy-menu-define yas--minor-mode-menu
582 "Menu used when `yas-minor-mode' is active."
583 '("YASnippet" :visible yas-use-menu
585 ["Expand trigger" yas-expand
586 :help "Possibly expand tab trigger before point"]
587 ["Insert at point..." yas-insert-snippet
588 :help "Prompt for an expandable snippet and expand it at point"]
589 ["New snippet..." yas-new-snippet
590 :help "Create a new snippet in an appropriate directory"]
591 ["Visit snippet file..." yas-visit-snippet-file
592 :help "Prompt for an expandable snippet and find its file"]
594 ("Snippet menu behaviour"
595 ["Visit snippets" (setq yas-visit-from-menu t)
596 :help "Visit snippets from the menu"
597 :active t :style radio :selected yas-visit-from-menu]
598 ["Expand snippets" (setq yas-visit-from-menu nil)
599 :help "Expand snippets from the menu"
600 :active t :style radio :selected (not yas-visit-from-menu)]
602 ["Show all known modes" (setq yas-use-menu 'full)
603 :help "Show one snippet submenu for each loaded table"
604 :active t :style radio :selected (eq yas-use-menu 'full)]
605 ["Abbreviate according to current mode" (setq yas-use-menu 'abbreviate)
606 :help "Show only snippet submenus for the current active modes"
607 :active t :style radio :selected (eq yas-use-menu 'abbreviate)])
609 ["Auto" (setq yas-indent-line 'auto)
610 :help "Indent each line of the snippet with `indent-according-to-mode'"
611 :active t :style radio :selected (eq yas-indent-line 'auto)]
612 ["Fixed" (setq yas-indent-line 'fixed)
613 :help "Indent the snippet to the current column"
614 :active t :style radio :selected (eq yas-indent-line 'fixed)]
615 ["None" (setq yas-indent-line 'none)
616 :help "Don't apply any particular snippet indentation after expansion"
617 :active t :style radio :selected (not (member yas-indent-line '(fixed auto)))]
619 ["Also auto indent first line" (setq yas-also-auto-indent-first-line
620 (not yas-also-auto-indent-first-line))
621 :help "When auto-indenting also, auto indent the first line menu"
622 :active (eq yas-indent-line 'auto)
623 :style toggle :selected yas-also-auto-indent-first-line]
626 ["System X-widget" (setq yas-prompt-functions
628 (remove 'yas-x-prompt
629 yas-prompt-functions)))
630 :help "Use your windowing system's (gtk, mac, windows, etc...) default menu"
631 :active t :style radio :selected (eq (car yas-prompt-functions)
633 ["Dropdown-list" (setq yas-prompt-functions
634 (cons 'yas-dropdown-prompt
635 (remove 'yas-dropdown-prompt
636 yas-prompt-functions)))
637 :help "Use a special dropdown list"
638 :active t :style radio :selected (eq (car yas-prompt-functions)
639 'yas-dropdown-prompt)]
640 ["Ido" (setq yas-prompt-functions
641 (cons 'yas-ido-prompt
642 (remove 'yas-ido-prompt
643 yas-prompt-functions)))
644 :help "Use an ido-style minibuffer prompt"
645 :active t :style radio :selected (eq (car yas-prompt-functions)
647 ["Completing read" (setq yas-prompt-functions
648 (cons 'yas-completing-prompt
649 (remove 'yas-completing-prompt
650 yas-prompt-functions)))
651 :help "Use a normal minibuffer prompt"
652 :active t :style radio :selected (eq (car yas-prompt-functions)
653 'yas-completing-prompt)]
656 ["Wrap region in exit marker"
657 (setq yas-wrap-around-region
658 (not yas-wrap-around-region))
659 :help "If non-nil automatically wrap the selected text in the $0 snippet exit"
660 :style toggle :selected yas-wrap-around-region]
661 ["Allow stacked expansions "
662 (setq yas-triggers-in-field
663 (not yas-triggers-in-field))
664 :help "If non-nil allow snippets to be triggered inside other snippet fields"
665 :style toggle :selected yas-triggers-in-field]
666 ["Revive snippets on undo "
667 (setq yas-snippet-revival
668 (not yas-snippet-revival))
669 :help "If non-nil allow snippets to become active again after undo"
670 :style toggle :selected yas-snippet-revival]
673 (not yas-good-grace))
674 :help "If non-nil don't raise errors in bad embedded elisp in snippets"
675 :style toggle :selected yas-good-grace]
678 ["Load snippets..." yas-load-directory
679 :help "Load snippets from a specific directory"]
680 ["Reload everything" yas-reload-all
681 :help "Cleanup stuff, reload snippets, rebuild menus"]
683 :help "Display some information about YASnippet"]))
685 (defvar yas--extra-modes nil
686 "An internal list of modes for which to also lookup snippets.
688 This variable probably makes more sense as buffer-local, so
689 ensure your use `make-local-variable' when you set it.")
690 (define-obsolete-variable-alias 'yas-extra-modes 'yas--extra-modes "0.8.1")
692 (defvar yas--tables (make-hash-table)
693 "A hash table of mode symbols to `yas--table' objects.")
695 (defvar yas--parents (make-hash-table)
696 "A hash table of mode symbols do lists of direct parent mode symbols.
698 This list is populated when reading the \".yas-parents\" files
699 found when traversing snippet directories with
700 `yas-load-directory'.
702 There might be additional parenting information stored in the
703 `derived-mode-parent' property of some mode symbols, but that is
706 (defvar yas--direct-keymaps (list)
707 "Keymap alist supporting direct snippet keybindings.
709 This variable is placed in `emulation-mode-map-alists'.
711 Its elements looks like (TABLE-NAME . KEYMAP). They're
712 instantiated on `yas-reload-all' but KEYMAP is added to only when
713 loading snippets. `yas--direct-TABLE-NAME' is then a variable set
714 buffer-locally when entering `yas-minor-mode'. KEYMAP binds all
715 defined direct keybindings to the command
716 `yas-expand-from-keymap' which then which snippet to expand.")
718 (defun yas-direct-keymaps-reload ()
719 "Force reload the direct keybinding for active snippet tables."
721 (setq yas--direct-keymaps nil)
722 (maphash #'(lambda (name table)
723 (push (cons (intern (format "yas--direct-%s" name))
724 (yas--table-direct-keymap table))
725 yas--direct-keymaps))
728 (defun yas--modes-to-activate (&optional mode)
729 "Compute list of mode symbols that are active for `yas-expand'
732 (setq dfs (lambda (mode &optional explored)
736 in (cl-list* (get mode 'derived-mode-parent)
737 (ignore-errors (symbol-function mode))
738 (gethash mode yas--parents))
740 (not (memq neighbour explored))
742 append (funcall dfs neighbour explored)))))
743 (remove-duplicates (if mode
745 (append yas--extra-modes
746 (funcall dfs major-mode))))))
748 (defvar yas-minor-mode-hook nil
749 "Hook run when `yas-minor-mode' is turned on.")
752 (define-minor-mode yas-minor-mode
753 "Toggle YASnippet mode.
755 When YASnippet mode is enabled, `yas-expand', normally bound to
756 the TAB key, expands snippets of code depending on the major
759 With no argument, this command toggles the mode.
760 positive prefix argument turns on the mode.
761 Negative prefix argument turns off the mode.
764 \\{yas-minor-mode-map}"
766 ;; The indicator for the mode line.
769 (cond (yas-minor-mode
770 ;; Install the direct keymaps in `emulation-mode-map-alists'
771 ;; (we use `add-hook' even though it's not technically a hook,
772 ;; but it works). Then define variables named after modes to
773 ;; index `yas--direct-keymaps'.
775 ;; Also install the post-command-hook.
777 (add-hook 'emulation-mode-map-alists 'yas--direct-keymaps)
778 (add-hook 'post-command-hook 'yas--post-command-handler nil t)
779 ;; Set the `yas--direct-%s' vars for direct keymap expansion
781 (dolist (mode (yas--modes-to-activate))
782 (let ((name (intern (format "yas--direct-%s" mode))))
783 (set-default name nil)
784 (set (make-local-variable name) t)))
787 (yas--load-pending-jits))
789 ;; Uninstall the direct keymaps and the post-command hook
791 (remove-hook 'post-command-hook 'yas--post-command-handler t)
792 (remove-hook 'emulation-mode-map-alists 'yas--direct-keymaps))))
794 (defun yas-activate-extra-mode (mode)
795 "Activates the snippets for the given `mode' in the buffer.
797 The function can be called in the hook of a minor mode to
798 activate snippets associated with that mode."
802 (maphash (lambda (k _)
803 (setq modes (cons (list k) modes)))
805 (setq symbol (completing-read
806 "Activate mode: " modes nil t))
808 (when (not (string= "" symbol))
811 (add-to-list (make-local-variable 'yas--extra-modes) mode)
812 (yas--load-pending-jits)))
814 (defun yas-deactivate-extra-mode (mode)
815 "Deactivates the snippets for the given `mode' in the buffer."
819 "Deactivate mode: " (mapcar #'list yas--extra-modes) nil t))))
820 (set (make-local-variable 'yas--extra-modes)
824 (defvar yas-dont-activate '(minibufferp)
825 "If non-nil don't let `yas-global-mode' affect some buffers.
827 If a function of zero arguments, then its result is used.
829 If a list of functions, then all functions must return nil to
830 activate yas for this buffer.
832 In Emacsen <= 23, this variable is buffer-local. Because
833 `yas-minor-mode-on' is called by `yas-global-mode' after
834 executing the buffer's major mode hook, setting this variable
835 there is an effective way to define exceptions to the \"global\"
836 activation behaviour.
838 In Emacsen > 23, only the global value is used. To define
839 per-mode exceptions to the \"global\" activation behaviour, call
840 `yas-minor-mode' with a negative argument directily in the major
842 (unless (> emacs-major-version 23)
844 (make-variable-buffer-local 'yas-dont-activate)))
847 (defun yas-minor-mode-on ()
848 "Turn on YASnippet minor mode.
850 Honour `yas-dont-activate', which see."
852 ;; Check `yas-dont-activate'
853 (unless (cond ((functionp yas-dont-activate)
854 (funcall yas-dont-activate))
855 ((consp yas-dont-activate)
856 (some #'funcall yas-dont-activate))
861 (define-globalized-minor-mode yas-global-mode yas-minor-mode yas-minor-mode-on
865 (defun yas--global-mode-reload-with-jit-maybe ()
866 "Run `yas-reload-all' when `yas-global-mode' is on."
867 (when yas-global-mode (yas-reload-all)))
869 (add-hook 'yas-global-mode-hook 'yas--global-mode-reload-with-jit-maybe)
874 (defvar yas--font-lock-keywords
875 (append '(("^#.*$" . font-lock-comment-face))
876 lisp-font-lock-keywords-2
878 (0 font-lock-keyword-face)
879 (1 font-lock-string-face t))
881 (0 font-lock-keyword-face)
882 (1 font-lock-warning-face t))
883 ("${" . font-lock-keyword-face)
884 ("$[0-9]+?" . font-lock-preprocessor-face)
885 ("\\(\\$(\\)" 1 font-lock-preprocessor-face)
887 (0 font-lock-keyword-face)))))
889 (defvar snippet-mode-map
890 (let ((map (make-sparse-keymap)))
891 (easy-menu-define nil
893 "Menu used when snippet-mode is active."
895 (mapcar #'(lambda (ent)
897 (define-key map (third ent) (second ent)))
898 (vector (first ent) (second ent) t))
899 '(("Load this snippet" yas-load-snippet-buffer "\C-c\C-l")
900 ("Load and quit window" yas-load-snippet-buffer-and-close "\C-c\C-c")
901 ("Try out this snippet" yas-tryout-snippet "\C-c\C-t")))))
903 "The keymap used when `snippet-mode' is active.")
906 (define-derived-mode snippet-mode text-mode "Snippet"
907 "A mode for editing yasnippets"
908 (setq font-lock-defaults '(yas--font-lock-keywords))
909 (set (make-local-variable 'require-final-newline) nil)
910 (set (make-local-variable 'comment-start) "#")
911 (set (make-local-variable 'comment-start-skip) "#+[\t ]*"))
915 ;;; Internal structs for template management
917 (cl-defstruct (yas--template
918 (:constructor yas--make-template)
919 ;; Handles `yas-define-snippets' format, plus the
920 ;; initial TABLE argument.
922 yas--define-snippets-2
925 &optional xname condition group
926 expand-env file xkeybinding xuuid
929 (and file (file-name-directory file))
931 (keybinding (yas--read-keybinding xkeybinding))
932 (uuid (or xuuid name))
933 (old (gethash uuid (yas--table-uuidhash table)))
935 (and old (yas--template-menu-binding-pair old)))
937 (and old (yas--template-perm-group old))))))
938 "A template for a snippet."
948 group ;; as dictated by the #group: directive or .yas-make-groups
949 perm-group ;; as dictated by `yas-define-menu'
953 (defstruct (yas--table (:constructor yas--make-snippet-table (name)))
954 "A table to store snippets for a particular mode.
956 Has the following fields:
960 A symbol name normally corresponding to a major mode, but can
961 also be a pseudo major-mode to be used in
962 `yas-activate-extra-mode', for example.
966 A hash table (KEY . NAMEHASH), known as the \"keyhash\". KEY is
967 a string or a vector, where the former is the snippet's trigger
968 and the latter means it's a direct keybinding. NAMEHASH is yet
969 another hash of (NAME . TEMPLATE) where NAME is the snippet's
970 name and TEMPLATE is a `yas--template' object.
972 `yas--table-direct-keymap'
974 A keymap for the snippets in this table that have direct
975 keybindings. This is kept in sync with the keyhash, i.e., all
976 the elements of the keyhash that are vectors appear here as
977 bindings to `yas-expand-from-keymap'.
979 `yas--table-uuidhash'
981 A hash table mapping snippets uuid's to the same `yas--template'
982 objects. A snippet uuid defaults to the snippet's name."
984 (hash (make-hash-table :test 'equal))
985 (uuidhash (make-hash-table :test 'equal))
987 (direct-keymap (make-sparse-keymap)))
989 (defun yas--get-template-by-uuid (mode uuid)
990 "Find the snippet template in MODE by its UUID."
991 (let* ((table (gethash mode yas--tables mode)))
993 (gethash uuid (yas--table-uuidhash table)))))
995 ;; Apropos storing/updating in TABLE, this works in two steps:
997 ;; 1. `yas--remove-template-by-uuid' removes any
998 ;; keyhash-namehash-template mappings from TABLE, grabbing the
999 ;; snippet by its uuid. Also removes mappings from TABLE's
1000 ;; `yas--table-direct-keymap' (FIXME: and should probably take care
1001 ;; of potentially stale menu bindings right?.)
1003 ;; 2. `yas--add-template' adds this all over again.
1005 ;; Create a new or add to an existing keyhash-namehash mapping.
1007 ;; For reference on understanding this, consider three snippet
1010 ;; A: # name: The Foo
1012 ;; # binding: C-c M-l
1014 ;; B: # name: Mrs Foo
1017 ;; C: # name: The Bar
1018 ;; # binding: C-c M-l
1023 ;; keyhash namehashes(3) yas--template structs(4)
1024 ;; -----------------------------------------------------
1027 ;; "foo" ---> "The Foo" ---> [yas--template A] |
1028 ;; "Mrs Foo" ---> [yas--template B] |
1030 ;; [C-c M-l] ---> "The Foo" -------------------------/
1031 ;; "The Bar" ---> [yas--template C]
1033 ;; "baz" ---> "Baz" ---> [yas--template D]
1035 ;; Additionally, since uuid defaults to the name, we have a
1036 ;; `yas--table-uuidhash' for TABLE
1038 ;; uuidhash yas--template structs
1039 ;; -------------------------------
1040 ;; "The Foo" ---> [yas--template A]
1041 ;; "Mrs Foo" ---> [yas--template B]
1042 ;; "The Bar" ---> [yas--template C]
1043 ;; "Baz" ---> [yas--template D]
1045 ;; FIXME: the more I look at this data-structure the more I think I'm
1046 ;; stupid. There has to be an easier way (but beware lots of code
1047 ;; depends on this).
1049 (defun yas--remove-template-by-uuid (table uuid)
1050 "Remove from TABLE a template identified by UUID."
1051 (let ((template (gethash uuid (yas--table-uuidhash table))))
1053 (let* ((name (yas--template-name template))
1055 ;; Remove the name from each of the targeted namehashes
1057 (maphash #'(lambda (k v)
1058 (let ((template (gethash name v)))
1060 (eq uuid (yas--template-uuid template)))
1062 (when (zerop (hash-table-count v))
1063 (push k empty-keys)))))
1064 (yas--table-hash table))
1065 ;; Remove the namehash themselves if they've become empty
1067 (dolist (key empty-keys)
1069 (define-key (yas--table-direct-keymap table) key nil))
1070 (remhash key (yas--table-hash table)))
1072 ;; Finally, remove the uuid from the uuidhash
1074 (remhash uuid (yas--table-uuidhash table))))))
1076 (defun yas--add-template (table template)
1077 "Store in TABLE the snippet template TEMPLATE.
1079 KEY can be a string (trigger key) of a vector (direct
1081 (let ((name (yas--template-name template))
1082 (key (yas--template-key template))
1083 (keybinding (yas--template-keybinding template))
1084 (_menu-binding-pair (yas--template-menu-binding-pair-get-create template)))
1085 (dolist (k (remove nil (list key keybinding)))
1089 (yas--table-hash table))
1091 (make-hash-table :test 'equal)
1092 (yas--table-hash table))))
1094 (define-key (yas--table-direct-keymap table) k 'yas-expand-from-keymap)))
1096 ;; Update TABLE's `yas--table-uuidhash'
1097 (puthash (yas--template-uuid template)
1099 (yas--table-uuidhash table))))
1101 (defun yas--update-template (table template)
1102 "Add or update TEMPLATE in TABLE.
1104 Also takes care of adding and updating to the associated menu.
1106 ;; Remove from table by uuid
1108 (yas--remove-template-by-uuid table (yas--template-uuid template))
1109 ;; Add to table again
1111 (yas--add-template table template)
1112 ;; Take care of the menu
1114 (yas--update-template-menu table template)
1117 (defun yas--update-template-menu (table template)
1118 "Update every menu-related for TEMPLATE."
1119 (let ((menu-binding-pair (yas--template-menu-binding-pair-get-create template))
1120 (key (yas--template-key template))
1121 (keybinding (yas--template-keybinding template)))
1122 ;; The snippet might have changed name or keys, so update
1123 ;; user-visible strings
1125 (unless (eq (cdr menu-binding-pair) :none)
1126 ;; the menu item name
1128 (setf (cadar menu-binding-pair) (yas--template-name template))
1129 ;; the :keys information (also visible to the user)
1130 (setf (getf (cdr (car menu-binding-pair)) :keys)
1131 (or (and keybinding (key-description keybinding))
1132 (and key (concat key yas-trigger-symbol))))))
1133 (unless (yas--template-menu-managed-by-yas-define-menu template)
1135 (yas--menu-keymap-get-create (yas--table-mode table)
1136 (mapcar #'yas--table-mode
1137 (yas--table-parents table))))
1138 (group (yas--template-group template)))
1139 ;; Remove from menu keymap
1141 (assert menu-keymap)
1142 (yas--delete-from-keymap menu-keymap (yas--template-uuid template))
1144 ;; Add necessary subgroups as necessary.
1146 (dolist (subgroup group)
1147 (let ((subgroup-keymap (lookup-key menu-keymap (vector (make-symbol subgroup)))))
1148 (unless (and subgroup-keymap
1149 (keymapp subgroup-keymap))
1150 (setq subgroup-keymap (make-sparse-keymap))
1151 (define-key menu-keymap (vector (make-symbol subgroup))
1152 `(menu-item ,subgroup ,subgroup-keymap)))
1153 (setq menu-keymap subgroup-keymap)))
1155 ;; Add this entry to the keymap
1157 (define-key menu-keymap
1158 (vector (make-symbol (yas--template-uuid template)))
1159 (car (yas--template-menu-binding-pair template))))))
1161 (defun yas--namehash-templates-alist (namehash)
1162 "Return NAMEHASH as an alist."
1164 (maphash #'(lambda (k v)
1165 (push (cons k v) alist))
1169 (defun yas--fetch (table key)
1170 "Fetch templates in TABLE by KEY.
1172 Return a list of cons (NAME . TEMPLATE) where NAME is a
1173 string and TEMPLATE is a `yas--template' structure."
1174 (let* ((keyhash (yas--table-hash table))
1175 (namehash (and keyhash (gethash key keyhash))))
1177 (yas--filter-templates-by-condition (yas--namehash-templates-alist namehash)))))
1180 ;;; Filtering/condition logic
1182 (defun yas--eval-condition (condition)
1189 (yas--message 1 "Error in condition evaluation: %s" (error-message-string err))
1193 (defun yas--filter-templates-by-condition (templates)
1194 "Filter the templates using the applicable condition.
1196 TEMPLATES is a list of cons (NAME . TEMPLATE) where NAME is a
1197 string and TEMPLATE is a `yas--template' structure.
1199 This function implements the rules described in
1200 `yas-buffer-local-condition'. See that variables documentation."
1201 (let ((requirement (yas--require-template-specific-condition-p)))
1202 (if (eq requirement 'always)
1204 (remove-if-not #'(lambda (pair)
1205 (yas--template-can-expand-p
1206 (yas--template-condition (cdr pair)) requirement))
1209 (defun yas--require-template-specific-condition-p ()
1210 "Decide if this buffer requests/requires snippet-specific
1211 conditions to filter out potential expansions."
1212 (if (eq 'always yas-buffer-local-condition)
1214 (let ((local-condition (or (and (consp yas-buffer-local-condition)
1215 (yas--eval-condition yas-buffer-local-condition))
1216 yas-buffer-local-condition)))
1217 (when local-condition
1218 (if (eq local-condition t)
1220 (and (consp local-condition)
1221 (eq 'require-snippet-condition (car local-condition))
1222 (symbolp (cdr local-condition))
1223 (cdr local-condition)))))))
1225 (defun yas--template-can-expand-p (condition requirement)
1226 "Evaluate CONDITION and REQUIREMENT and return a boolean."
1227 (let* ((result (or (null condition)
1228 (yas--eval-condition condition))))
1229 (cond ((eq requirement t)
1232 (eq requirement result)))))
1234 (defun yas--table-templates (table)
1237 (maphash #'(lambda (_key namehash)
1238 (maphash #'(lambda (name template)
1239 (push (cons name template) acc))
1241 (yas--table-hash table))
1242 (yas--filter-templates-by-condition acc))))
1244 (defun yas--templates-for-key-at-point ()
1245 "Find `yas--template' objects for any trigger keys preceding point.
1246 Returns (TEMPLATES START END). This function respects
1247 `yas-key-syntaxes', which see."
1249 (let ((original (point))
1250 (methods yas-key-syntaxes)
1255 (unless (eq method (car methods))
1256 ;; TRICKY: `eq'-ness test means we can only be here if
1257 ;; `method' is a function that returned `again', and hence
1258 ;; don't revert back to original position as per
1259 ;; `yas-key-syntaxes'.
1260 (goto-char original))
1261 (setq method (car methods))
1262 (cond ((stringp method)
1263 (skip-syntax-backward method)
1264 (setq methods (cdr methods)))
1266 (unless (eq (funcall method original)
1268 (setq methods (cdr methods))))
1270 (yas--warning "Warning invalid element %s in `yas-key-syntaxes'" method)))
1271 (let ((possible-key (buffer-substring-no-properties (point) original)))
1273 (goto-char original)
1275 (mapcan #'(lambda (table)
1276 (yas--fetch table possible-key))
1277 (yas--get-snippet-tables))))))
1279 (list templates (point) original)))))
1281 (defun yas--table-all-keys (table)
1282 "Get trigger keys of all active snippets in TABLE."
1284 (maphash #'(lambda (key namehash)
1285 (when (yas--filter-templates-by-condition (yas--namehash-templates-alist namehash))
1287 (yas--table-hash table))
1290 (defun yas--table-mode (table)
1291 (intern (yas--table-name table)))
1294 ;;; Internal functions and macros:
1296 (defun yas--handle-error (err)
1297 "Handle error depending on value of `yas-good-grace'."
1298 (let ((msg (yas--format "elisp error: %s" (error-message-string err))))
1299 (if yas-good-grace msg
1302 (defun yas--eval-lisp (form)
1303 "Evaluate FORM and convert the result to string."
1304 (let ((retval (catch 'yas--exception
1310 (let ((result (eval form)))
1312 (format "%s" result))))))
1313 (error (yas--handle-error err))))))
1314 (when (and (consp retval)
1315 (eq 'yas--exception (car retval)))
1316 (error (cdr retval)))
1319 (defun yas--eval-lisp-no-saves (form)
1322 (error (message "%s" (yas--handle-error err)))))
1324 (defun yas--read-lisp (string &optional nil-on-error)
1325 "Read STRING as a elisp expression and return it.
1327 In case STRING in an invalid expression and NIL-ON-ERROR is nil,
1328 return an expression that when evaluated will issue an error."
1331 (error (and (not nil-on-error)
1332 `(error (error-message-string ,err))))))
1334 (defun yas--read-keybinding (keybinding)
1335 "Read KEYBINDING as a snippet keybinding, return a vector."
1336 (when (and keybinding
1337 (not (string-match "keybinding" keybinding)))
1339 (let ((res (or (and (string-match "^\\[.*\\]$" keybinding)
1341 (read-kbd-macro keybinding 'need-vector))))
1344 (yas--message 3 "warning: keybinding \"%s\" invalid since %s."
1345 keybinding (error-message-string err))
1348 (defun yas--table-get-create (mode)
1349 "Get or create the snippet table corresponding to MODE."
1350 (let ((table (gethash mode
1353 (setq table (yas--make-snippet-table (symbol-name mode)))
1354 (puthash mode table yas--tables)
1355 (push (cons (intern (format "yas--direct-%s" mode))
1356 (yas--table-direct-keymap table))
1357 yas--direct-keymaps))
1360 (defun yas--get-snippet-tables (&optional mode)
1361 "Get snippet tables for MODE.
1363 MODE defaults to the current buffer's `major-mode'.
1365 Return a list of `yas--table' objects. The list of modes to
1366 consider is returned by `yas--modes-to-activate'"
1368 (mapcar #'(lambda (name)
1369 (gethash name yas--tables))
1370 (yas--modes-to-activate mode))))
1372 (defun yas--menu-keymap-get-create (mode &optional parents)
1373 "Get or create the menu keymap for MODE and its PARENTS.
1375 This may very well create a plethora of menu keymaps and arrange
1376 them all in `yas--menu-table'"
1377 (let* ((menu-keymap (or (gethash mode yas--menu-table)
1378 (puthash mode (make-sparse-keymap) yas--menu-table))))
1379 (mapc #'yas--menu-keymap-get-create parents)
1380 (define-key yas--minor-mode-menu (vector mode)
1381 `(menu-item ,(symbol-name mode) ,menu-keymap
1382 :visible (yas--show-menu-p ',mode)))
1386 (defmacro yas--called-interactively-p (&optional kind)
1387 "A backward-compatible version of `called-interactively-p'.
1389 Optional KIND is as documented at `called-interactively-p'
1390 in GNU Emacs 24.1 or higher."
1391 (if (string< emacs-version "24.1")
1392 '(called-interactively-p)
1393 `(called-interactively-p ,kind)))
1396 ;;; Template-related and snippet loading functions
1398 (defun yas--parse-template (&optional file)
1399 "Parse the template in the current buffer.
1401 Optional FILE is the absolute file name of the file being
1404 Optional GROUP is the group where the template is to go,
1405 otherwise we attempt to calculate it from FILE.
1407 Return a snippet-definition, i.e. a list
1409 (KEY TEMPLATE NAME CONDITION GROUP VARS FILE KEYBINDING UUID)
1411 If the buffer contains a line of \"# --\" then the contents above
1412 this line are ignored. Directives can set most of these with the syntax:
1414 # directive-name : directive-value
1416 Here's a list of currently recognized directives:
1427 (goto-char (point-min))
1428 (let* ((type 'snippet)
1430 (file-name-nondirectory file)))
1436 (yas--calculate-group file)))
1440 (if (re-search-forward "^# --\n" nil t)
1441 (progn (setq template
1442 (buffer-substring-no-properties (point)
1444 (setq bound (point))
1445 (goto-char (point-min))
1446 (while (re-search-forward "^# *\\([^ ]+?\\) *: *\\(.*\\)$" bound t)
1447 (when (string= "uuid" (match-string-no-properties 1))
1448 (setq uuid (match-string-no-properties 2)))
1449 (when (string= "type" (match-string-no-properties 1))
1450 (setq type (if (string= "command" (match-string-no-properties 2))
1453 (when (string= "key" (match-string-no-properties 1))
1454 (setq key (match-string-no-properties 2)))
1455 (when (string= "name" (match-string-no-properties 1))
1456 (setq name (match-string-no-properties 2)))
1457 (when (string= "condition" (match-string-no-properties 1))
1458 (setq condition (yas--read-lisp (match-string-no-properties 2))))
1459 (when (string= "group" (match-string-no-properties 1))
1460 (setq group (match-string-no-properties 2)))
1461 (when (string= "expand-env" (match-string-no-properties 1))
1462 (setq expand-env (yas--read-lisp (match-string-no-properties 2)
1464 (when (string= "binding" (match-string-no-properties 1))
1465 (setq binding (match-string-no-properties 2)))))
1467 (buffer-substring-no-properties (point-min) (point-max))))
1468 (unless (or key binding)
1469 (setq key (and file (file-name-nondirectory file))))
1470 (when (eq type 'command)
1471 (setq template (yas--read-lisp (concat "(progn" template ")"))))
1473 (setq group (split-string group "\\.")))
1474 (list key template name condition group expand-env file binding uuid)))
1476 (defun yas--calculate-group (file)
1477 "Calculate the group for snippet file path FILE."
1478 (let* ((dominating-dir (locate-dominating-file file
1479 ".yas-make-groups"))
1480 (extra-path (and dominating-dir
1481 (replace-regexp-in-string (concat "^"
1482 (expand-file-name dominating-dir))
1484 (expand-file-name file))))
1485 (extra-dir (and extra-path
1486 (file-name-directory extra-path)))
1487 (group (and extra-dir
1488 (replace-regexp-in-string "/"
1490 (directory-file-name extra-dir)))))
1493 (defun yas--subdirs (directory &optional filep)
1494 "Return subdirs or files of DIRECTORY according to FILEP."
1495 (remove-if (lambda (file)
1496 (or (string-match "^\\."
1497 (file-name-nondirectory file))
1498 (string-match "^#.*#$"
1499 (file-name-nondirectory file))
1501 (file-name-nondirectory file))
1503 (file-directory-p file)
1504 (not (file-directory-p file)))))
1505 (directory-files directory t)))
1507 (defun yas--make-menu-binding (template)
1508 (let ((mode (yas--table-mode (yas--template-table template))))
1509 `(lambda () (interactive) (yas--expand-or-visit-from-menu ',mode ,(yas--template-uuid template)))))
1511 (defun yas--expand-or-visit-from-menu (mode uuid)
1512 (let* ((table (yas--table-get-create mode))
1513 (yas--current-template (and table
1514 (gethash uuid (yas--table-uuidhash table)))))
1515 (when yas--current-template
1516 (if yas-visit-from-menu
1517 (yas--visit-snippet-file-1 yas--current-template)
1518 (let ((where (if (region-active-p)
1519 (cons (region-beginning) (region-end))
1520 (cons (point) (point)))))
1521 (yas-expand-snippet (yas--template-content yas--current-template)
1524 (yas--template-expand-env yas--current-template)))))))
1526 (defun yas--key-from-desc (text)
1527 "Return a yasnippet key from a description string TEXT."
1528 (replace-regexp-in-string "\\(\\w+\\).*" "\\1" text))
1531 ;;; Popping up for keys and templates
1533 (defun yas--prompt-for-template (templates &optional prompt)
1534 "Interactively choose a template from the list TEMPLATES.
1536 TEMPLATES is a list of `yas--template'.
1538 Optional PROMPT sets the prompt to use."
1541 (sort templates #'(lambda (t1 t2)
1542 (< (length (yas--template-name t1))
1543 (length (yas--template-name t2))))))
1544 (some #'(lambda (fn)
1545 (funcall fn (or prompt "Choose a snippet: ")
1547 #'yas--template-name))
1548 yas-prompt-functions)))
1550 (defun yas--prompt-for-keys (keys &optional prompt)
1551 "Interactively choose a template key from the list KEYS.
1553 Optional PROMPT sets the prompt to use."
1555 (some #'(lambda (fn)
1556 (funcall fn (or prompt "Choose a snippet key: ") keys))
1557 yas-prompt-functions)))
1559 (defun yas--prompt-for-table (tables &optional prompt)
1560 "Interactively choose a table from the list TABLES.
1562 Optional PROMPT sets the prompt to use."
1564 (some #'(lambda (fn)
1565 (funcall fn (or prompt "Choose a snippet table: ")
1568 yas-prompt-functions)))
1570 (defun yas-x-prompt (prompt choices &optional display-fn)
1571 "Display choices in a x-window prompt."
1572 (when (and window-system choices)
1575 (if (fboundp 'posn-at-point)
1576 (let ((x-y (posn-x-y (posn-at-point (point)))))
1577 (list (list (+ (car x-y) 10)
1582 ,@(mapcar* (lambda (c d) `(,(concat " " d) . ,c))
1584 (if display-fn (mapcar display-fn choices) choices)))))
1587 (defun yas-ido-prompt (prompt choices &optional display-fn)
1588 (when (and (fboundp 'ido-completing-read)
1589 (or (>= emacs-major-version 24)
1591 (yas-completing-prompt prompt choices display-fn #'ido-completing-read)))
1593 (defun yas-dropdown-prompt (_prompt choices &optional display-fn)
1594 (when (fboundp 'dropdown-list)
1595 (let* ((formatted-choices
1596 (if display-fn (mapcar display-fn choices) choices))
1597 (n (dropdown-list formatted-choices)))
1598 (if n (nth n choices)
1601 (defun yas-completing-prompt (prompt choices &optional display-fn completion-fn)
1602 (let* ((formatted-choices
1603 (if display-fn (mapcar display-fn choices) choices))
1604 (chosen (funcall (or completion-fn #'completing-read)
1605 prompt formatted-choices
1606 nil 'require-match nil nil)))
1607 (if (eq choices formatted-choices)
1609 (nth (or (position chosen formatted-choices :test #'string=) 0)
1612 (defun yas-no-prompt (_prompt choices &optional _display-fn)
1616 ;;; Defining snippets
1617 ;; This consists of creating and registering `yas--template' objects in the
1621 (defvar yas--creating-compiled-snippets nil)
1623 (defun yas--define-snippets-1 (snippet snippet-table)
1624 "Helper for `yas-define-snippets'."
1625 ;; Update the appropriate table. Also takes care of adding the
1626 ;; key indicators in the templates menu entry, if any.
1627 (yas--update-template
1628 snippet-table (apply #'yas--define-snippets-2 snippet-table snippet)))
1630 (defun yas-define-snippets (mode snippets)
1631 "Define SNIPPETS for MODE.
1633 SNIPPETS is a list of snippet definitions, each taking the
1636 (KEY TEMPLATE NAME CONDITION GROUP EXPAND-ENV FILE KEYBINDING UUID)
1638 Within these, only KEY and TEMPLATE are actually mandatory.
1640 TEMPLATE might be a Lisp form or a string, depending on whether
1641 this is a snippet or a snippet-command.
1643 CONDITION, EXPAND-ENV and KEYBINDING are Lisp forms, they have
1644 been `yas--read-lisp'-ed and will eventually be
1645 `yas--eval-lisp'-ed.
1647 The remaining elements are strings.
1649 FILE is probably of very little use if you're programatically
1652 UUID is the snippet's \"unique-id\". Loading a second snippet
1653 file with the same uuid would replace the previous snippet.
1655 You can use `yas--parse-template' to return such lists based on
1656 the current buffers contents."
1657 (if yas--creating-compiled-snippets
1658 (let ((print-length nil))
1659 (insert ";;; Snippet definitions:\n;;;\n")
1660 (dolist (snippet snippets)
1661 ;; We omit file because the snippet will be loaded from
1662 ;; the compiled file instead, so deleting or changing
1663 ;; the original won't have any effect.
1664 (setcar (nthcdr 6 snippet) nil))
1665 (insert (pp-to-string
1666 `(yas-define-snippets ',mode ',snippets)))
1669 (let ((snippet-table (yas--table-get-create mode))
1671 (dolist (snippet snippets)
1672 (setq template (yas--define-snippets-1 snippet
1677 ;;; Loading snippets from files
1679 (defun yas--load-yas-setup-file (file)
1680 (if (not yas--creating-compiled-snippets)
1682 (load file 'noerror (<= yas-verbosity 2))
1683 (let ((elfile (concat file ".el")))
1684 (when (file-exists-p elfile)
1685 (insert ";;; contents of the .yas-setup.el support file:\n;;;\n")
1686 (insert-file-contents elfile)
1687 (goto-char (point-max))))))
1689 (defun yas--define-parents (mode parents)
1690 "Add PARENTS to the list of MODE's parents."
1691 (puthash mode (remove-duplicates
1693 (gethash mode yas--parents)))
1696 (defun yas-load-directory (top-level-dir &optional use-jit interactive)
1697 "Load snippets in directory hierarchy TOP-LEVEL-DIR.
1699 Below TOP-LEVEL-DIR each directory should be a mode name.
1701 With prefix argument USE-JIT do jit-loading of snippets."
1703 (list (read-directory-name "Select the root directory: " nil nil t)
1704 current-prefix-arg t))
1705 (unless yas-snippet-dirs
1706 (setq yas-snippet-dirs top-level-dir))
1707 (let ((impatient-buffers))
1708 (dolist (dir (yas--subdirs top-level-dir))
1709 (let* ((major-mode-and-parents (yas--compute-major-mode-and-parents
1710 (concat dir "/dummy")))
1711 (mode-sym (car major-mode-and-parents))
1712 (parents (cdr major-mode-and-parents)))
1713 ;; Attention: The parents and the menus are already defined
1714 ;; here, even if the snippets are later jit-loaded.
1716 ;; * We need to know the parents at this point since entering a
1717 ;; given mode should jit load for its parents
1718 ;; immediately. This could be reviewed, the parents could be
1719 ;; discovered just-in-time-as well
1721 ;; * We need to create the menus here to support the `full'
1722 ;; option to `yas-use-menu' (all known snippet menus are shown to the user)
1724 (yas--define-parents mode-sym parents)
1725 (yas--menu-keymap-get-create mode-sym)
1726 (let ((fun `(lambda () ;; FIXME: Simulating lexical-binding.
1727 (yas--load-directory-1 ',dir ',mode-sym))))
1729 (yas--schedule-jit mode-sym fun)
1731 ;; Look for buffers that are already in `mode-sym', and so
1732 ;; need the new snippets immediately...
1735 (cl-loop for buffer in (buffer-list)
1736 do (with-current-buffer buffer
1737 (when (eq major-mode mode-sym)
1738 (yas--message 3 "Discovered there was already %s in %s" buffer mode-sym)
1739 (push buffer impatient-buffers)))))))
1740 ;; ...after TOP-LEVEL-DIR has been completely loaded, call
1741 ;; `yas--load-pending-jits' in these impatient buffers.
1743 (cl-loop for buffer in impatient-buffers
1744 do (with-current-buffer buffer (yas--load-pending-jits))))
1746 (yas--message 3 "Loaded snippets from %s." top-level-dir)))
1748 (defun yas--load-directory-1 (directory mode-sym)
1749 "Recursively load snippet templates from DIRECTORY."
1750 (if yas--creating-compiled-snippets
1751 (let ((output-file (expand-file-name ".yas-compiled-snippets.el"
1753 (with-temp-file output-file
1754 (insert (format ";;; Compiled snippets and support files for `%s'\n"
1756 (yas--load-directory-2 directory mode-sym)
1757 (insert (format ";;; Do not edit! File generated at %s\n"
1758 (current-time-string)))))
1760 (unless (file-exists-p (concat directory "/" ".yas-skip"))
1761 (if (and (progn (yas--message 2 "Loading compiled snippets from %s" directory) t)
1762 (load (expand-file-name ".yas-compiled-snippets" directory) 'noerror (<= yas-verbosity 3)))
1763 (yas--message 2 "Loading snippet files from %s" directory)
1764 (yas--load-directory-2 directory mode-sym)))))
1766 (defun yas--load-directory-2 (directory mode-sym)
1767 ;; Load .yas-setup.el files wherever we find them
1769 (yas--load-yas-setup-file (expand-file-name ".yas-setup" directory))
1770 (let* ((default-directory directory)
1772 ;; load the snippet files
1775 (dolist (file (yas--subdirs directory 'no-subdirs-just-files))
1776 (when (file-readable-p file)
1777 (insert-file-contents file nil nil nil t)
1778 (push (yas--parse-template file)
1781 (yas-define-snippets mode-sym
1783 ;; now recurse to a lower level
1785 (dolist (subdir (yas--subdirs directory))
1786 (yas--load-directory-2 subdir
1789 (defun yas--load-snippet-dirs (&optional nojit)
1790 "Reload the directories listed in `yas-snippet-dirs' or
1791 prompt the user to select one."
1793 (if yas-snippet-dirs
1794 (dolist (directory (reverse (yas-snippet-dirs)))
1795 (cond ((file-directory-p directory)
1796 (yas-load-directory directory (not nojit))
1798 (yas--message 3 "Loaded %s" directory)
1799 (yas--message 3 "Prepared just-in-time loading for %s" directory)))
1801 (push (yas--message 0 "Check your `yas-snippet-dirs': %s is not a directory" directory) errors))))
1802 (call-interactively 'yas-load-directory))
1805 (defun yas-reload-all (&optional no-jit interactive)
1806 "Reload all snippets and rebuild the YASnippet menu.
1808 When NO-JIT is non-nil force immediate reload of all known
1809 snippets under `yas-snippet-dirs', otherwise use just-in-time
1812 When called interactively, use just-in-time loading when given a
1814 (interactive (list (not current-prefix-arg) t))
1817 (snippet-editing-buffers
1818 (remove-if-not #'(lambda (buffer)
1819 (with-current-buffer buffer yas--editing-template))
1821 ;; Warn if there are buffers visiting snippets, since reloading will break
1822 ;; any on-line editing of those buffers.
1824 (when snippet-editing-buffers
1826 (if (y-or-n-p "Some buffers editing live snippets, close them and proceed with reload? ")
1827 (mapc #'kill-buffer snippet-editing-buffers)
1828 (yas--message 1 "Aborted reload...")
1830 ;; in a non-interactive use, at least set
1831 ;; `yas--editing-template' to nil, make it guess it next time around
1832 (mapc #'(lambda (buffer)
1833 (with-current-buffer buffer
1834 (kill-local-variable 'yas--editing-template)))
1837 ;; Empty all snippet tables and parenting info
1839 (setq yas--tables (make-hash-table))
1840 (setq yas--parents (make-hash-table))
1842 ;; Before killing `yas--menu-table' use its keys to cleanup the
1843 ;; mode menu parts of `yas--minor-mode-menu' (thus also cleaning
1844 ;; up `yas-minor-mode-map', which points to it)
1846 (maphash #'(lambda (menu-symbol _keymap)
1847 (define-key yas--minor-mode-menu (vector menu-symbol) nil))
1849 ;; Now empty `yas--menu-table' as well
1850 (setq yas--menu-table (make-hash-table))
1852 ;; Cancel all pending 'yas--scheduled-jit-loads'
1854 (setq yas--scheduled-jit-loads (make-hash-table))
1856 ;; Reload the directories listed in `yas-snippet-dirs' or prompt
1857 ;; the user to select one.
1859 (setq errors (yas--load-snippet-dirs no-jit))
1860 ;; Reload the direct keybindings
1862 (yas-direct-keymaps-reload)
1864 (run-hooks 'yas-after-reload-hook)
1865 (yas--message 3 "Reloaded everything%s...%s."
1866 (if no-jit "" " (snippets will load just-in-time)")
1867 (if errors " (some errors, check *Messages*)" "")))))
1869 (defvar yas-after-reload-hook nil
1870 "Hooks run after `yas-reload-all'.")
1872 (defun yas--load-pending-jits ()
1873 (dolist (mode (yas--modes-to-activate))
1874 (let ((funs (reverse (gethash mode yas--scheduled-jit-loads))))
1875 ;; must reverse to maintain coherence with `yas-snippet-dirs'
1877 (yas--message 3 "Loading for `%s', just-in-time: %s!" mode fun)
1879 (remhash mode yas--scheduled-jit-loads))))
1881 ;; (when (<= emacs-major-version 22)
1882 ;; (add-hook 'after-change-major-mode-hook 'yas--load-pending-jits))
1884 (defun yas--quote-string (string)
1885 "Escape and quote STRING.
1886 foo\"bar\\! -> \"foo\\\"bar\\\\!\""
1888 (replace-regexp-in-string "[\\\"]"
1894 ;;; Snippet compilation function
1896 (defun yas-compile-directory (top-level-dir)
1897 "Create .yas-compiled-snippets.el files under subdirs of TOP-LEVEL-DIR.
1899 This works by stubbing a few functions, then calling
1900 `yas-load-directory'."
1901 (interactive "DTop level snippet directory?")
1902 (let ((yas--creating-compiled-snippets t))
1903 (yas-load-directory top-level-dir nil)))
1905 (defun yas-recompile-all ()
1906 "Compile every dir in `yas-snippet-dirs'."
1908 (mapc #'yas-compile-directory (yas-snippet-dirs)))
1914 (defvar yas--scheduled-jit-loads (make-hash-table)
1915 "Alist of mode-symbols to forms to be evaled when `yas-minor-mode' kicks in.")
1917 (defun yas--schedule-jit (mode fun)
1918 (push fun (gethash mode yas--scheduled-jit-loads)))
1922 ;;; Some user level functions
1926 (message (concat "yasnippet (version "
1928 ") -- pluskid <pluskid@gmail.com>/joaotavora <joaotavora@gmail.com>")))
1931 ;;; Apropos snippet menu:
1933 ;; The snippet menu keymaps are store by mode in hash table called
1934 ;; `yas--menu-table'. They are linked to the main menu in
1935 ;; `yas--menu-keymap-get-create' and are initially created empty,
1936 ;; reflecting the table hierarchy.
1938 ;; They can be populated in two mutually exclusive ways: (1) by
1939 ;; reading `yas--template-group', which in turn is populated by the "#
1940 ;; group:" directives of the snippets or the ".yas-make-groups" file
1941 ;; or (2) by using a separate `yas-define-menu' call, which declares a
1942 ;; menu structure based on snippets uuids.
1944 ;; Both situations are handled in `yas--update-template-menu', which
1945 ;; uses the predicate `yas--template-menu-managed-by-yas-define-menu'
1946 ;; that can tell between the two situations.
1950 ;; * if `yas-define-menu' is used it must run before
1951 ;; `yas-define-snippets' and the UUIDS must match, otherwise we get
1952 ;; duplicate entries. The `yas--template' objects are created in
1953 ;; `yas-define-menu', holding nothing but the menu entry,
1954 ;; represented by a pair of ((menu-item NAME :keys KEYS) TYPE) and
1955 ;; stored in `yas--template-menu-binding-pair'. The (menu-item ...)
1956 ;; part is then stored in the menu keymap itself which make the item
1957 ;; appear to the user. These limitations could probably be revised.
1959 ;; * The `yas--template-perm-group' slot is only used in
1960 ;; `yas-describe-tables'.
1962 (defun yas--template-menu-binding-pair-get-create (template &optional type)
1963 "Get TEMPLATE's menu binding or assign it a new one.
1965 TYPE may be `:stay', signaling this menu binding should be
1966 static in the menu."
1967 (or (yas--template-menu-binding-pair template)
1968 (let (;; (key (yas--template-key template))
1969 ;; (keybinding (yas--template-keybinding template))
1971 (setf (yas--template-menu-binding-pair template)
1972 (cons `(menu-item ,(or (yas--template-name template)
1973 (yas--template-uuid template))
1974 ,(yas--make-menu-binding template)
1977 (defun yas--template-menu-managed-by-yas-define-menu (template)
1978 "Non-nil if TEMPLATE's menu entry was included in a `yas-define-menu' call."
1979 (cdr (yas--template-menu-binding-pair template)))
1982 (defun yas--show-menu-p (mode)
1983 (cond ((eq yas-use-menu 'abbreviate)
1985 (mapcar #'(lambda (table)
1986 (yas--table-mode table))
1987 (yas--get-snippet-tables))))
1990 (defun yas--delete-from-keymap (keymap uuid)
1991 "Recursively delete items with UUID from KEYMAP and its submenus."
1993 ;; XXX: This used to skip any submenus named \"parent mode\"
1995 ;; First of all, recursively enter submenus, i.e. the tree is
1996 ;; searched depth first so that stale submenus can be found in the
1999 (mapc #'(lambda (item)
2000 (when (and (listp (cdr item))
2001 (keymapp (third (cdr item))))
2002 (yas--delete-from-keymap (third (cdr item)) uuid)))
2004 ;; Set the uuid entry to nil
2006 (define-key keymap (vector (make-symbol uuid)) nil)
2007 ;; Destructively modify keymap
2009 (setcdr keymap (delete-if #'(lambda (item)
2010 (or (null (cdr item))
2011 (and (keymapp (third (cdr item)))
2012 (null (cdr (third (cdr item)))))))
2015 (defun yas-define-menu (mode menu &optional omit-items)
2016 "Define a snippet menu for MODE according to MENU, omitting OMIT-ITEMS.
2018 MENU is a list, its elements can be:
2020 - (yas-item UUID) : Creates an entry the snippet identified with
2021 UUID. The menu entry for a snippet thus identified is
2022 permanent, i.e. it will never move (be reordered) in the menu.
2024 - (yas-separator) : Creates a separator
2026 - (yas-submenu NAME SUBMENU) : Creates a submenu with NAME,
2027 SUBMENU has the same form as MENU. NAME is also added to the
2028 list of groups of the snippets defined thereafter.
2030 OMIT-ITEMS is a list of snippet uuid's that will always be
2031 omitted from MODE's menu, even if they're manually loaded."
2032 (let* ((table (yas--table-get-create mode))
2033 (hash (yas--table-uuidhash table)))
2034 (yas--define-menu-1 table
2035 (yas--menu-keymap-get-create mode)
2038 (dolist (uuid omit-items)
2039 (let ((template (or (gethash uuid hash)
2041 (yas--make-template :table table
2044 (setf (yas--template-menu-binding-pair template) (cons nil :none))))))
2046 (defun yas--define-menu-1 (table menu-keymap menu uuidhash &optional group-list)
2047 "Helper for `yas-define-menu'."
2048 (dolist (e (reverse menu))
2049 (cond ((eq (first e) 'yas-item)
2050 (let ((template (or (gethash (second e) uuidhash)
2054 :perm-group group-list
2057 (define-key menu-keymap (vector (gensym))
2058 (car (yas--template-menu-binding-pair-get-create template :stay)))))
2059 ((eq (first e) 'yas-submenu)
2060 (let ((subkeymap (make-sparse-keymap)))
2061 (define-key menu-keymap (vector (gensym))
2062 `(menu-item ,(second e) ,subkeymap))
2063 (yas--define-menu-1 table
2067 (append group-list (list (second e))))))
2068 ((eq (first e) 'yas-separator)
2069 (define-key menu-keymap (vector (gensym))
2070 '(menu-item "----")))
2072 (yas--message 3 "Don't know anything about menu entry %s" (first e))))))
2074 (defun yas--define (mode key template &optional name condition group)
2075 "Define a snippet. Expanding KEY into TEMPLATE.
2077 NAME is a description to this template. Also update the menu if
2078 `yas-use-menu' is t. CONDITION is the condition attached to
2079 this snippet. If you attach a condition to a snippet, then it
2080 will only be expanded when the condition evaluated to non-nil."
2081 (yas-define-snippets mode
2082 (list (list key template name condition group))))
2084 (defun yas-hippie-try-expand (first-time?)
2085 "Integrate with hippie expand.
2087 Just put this function in `hippie-expand-try-functions-list'."
2088 (when yas-minor-mode
2089 (if (not first-time?)
2090 (let ((yas-fallback-behavior 'return-nil))
2096 ;;; Apropos condition-cache:
2101 (defvar yas--condition-cache-timestamp nil)
2102 (defmacro yas-define-condition-cache (func doc &rest body)
2103 "Define a function FUNC with doc DOC and body BODY.
2104 BODY is executed at most once every snippet expansion attempt, to check
2105 expansion conditions.
2107 It doesn't make any sense to call FUNC programatically."
2108 `(defun ,func () ,(if (and doc
2111 "\n\nFor use in snippets' conditions. Within each
2112 snippet-expansion routine like `yas-expand', computes actual
2113 value for the first time then always returns a cached value.")
2114 (setq body (cons doc body))
2116 (let ((timestamp-and-value (get ',func 'yas--condition-cache)))
2117 (if (equal (car timestamp-and-value) yas--condition-cache-timestamp)
2118 (cdr timestamp-and-value)
2119 (let ((new-value (progn
2122 (put ',func 'yas--condition-cache (cons yas--condition-cache-timestamp new-value))
2125 (defalias 'yas-expand 'yas-expand-from-trigger-key)
2126 (defun yas-expand-from-trigger-key (&optional field)
2127 "Expand a snippet before point.
2129 If no snippet expansion is possible, fall back to the behaviour
2130 defined in `yas-fallback-behavior'.
2132 Optional argument FIELD is for non-interactive use and is an
2133 object satisfying `yas--field-p' to restrict the expansion to."
2135 (setq yas--condition-cache-timestamp (current-time))
2136 (let (templates-and-pos)
2137 (unless (and yas-expand-only-for-last-commands
2138 (not (member last-command yas-expand-only-for-last-commands)))
2139 (setq templates-and-pos (if field
2141 (narrow-to-region (yas--field-start field)
2142 (yas--field-end field))
2143 (yas--templates-for-key-at-point))
2144 (yas--templates-for-key-at-point))))
2145 (if templates-and-pos
2146 (yas--expand-or-prompt-for-template (first templates-and-pos)
2147 (second templates-and-pos)
2148 (third templates-and-pos))
2151 (defun yas-expand-from-keymap ()
2152 "Directly expand some snippets, searching `yas--direct-keymaps'.
2154 If expansion fails, execute the previous binding for this key"
2156 (setq yas--condition-cache-timestamp (current-time))
2157 (let* ((vec (subseq (this-command-keys-vector) (if current-prefix-arg
2158 (length (this-command-keys))
2160 (templates (mapcan #'(lambda (table)
2161 (yas--fetch table vec))
2162 (yas--get-snippet-tables))))
2164 (yas--expand-or-prompt-for-template templates)
2165 (let ((yas-fallback-behavior 'call-other-command))
2168 (defun yas--expand-or-prompt-for-template (templates &optional start end)
2169 "Expand one of TEMPLATES from START to END.
2171 Prompt the user if TEMPLATES has more than one element, else
2172 expand immediately. Common gateway for
2173 `yas-expand-from-trigger-key' and `yas-expand-from-keymap'."
2174 (let ((yas--current-template (or (and (rest templates) ;; more than one
2175 (yas--prompt-for-template (mapcar #'cdr templates)))
2177 (when yas--current-template
2178 (yas-expand-snippet (yas--template-content yas--current-template)
2181 (yas--template-expand-env yas--current-template)))))
2183 ;; Apropos the trigger key and the fallback binding:
2185 ;; When `yas-minor-mode-map' binds <tab>, that correctly overrides
2186 ;; org-mode's <tab>, for example and searching for fallbacks correctly
2187 ;; returns `org-cycle'. However, most other modes bind "TAB". TODO,
2188 ;; improve this explanation.
2190 (defun yas--fallback ()
2191 "Fallback after expansion has failed.
2193 Common gateway for `yas-expand-from-trigger-key' and
2194 `yas-expand-from-keymap'."
2195 (cond ((eq yas-fallback-behavior 'return-nil)
2198 ((eq yas-fallback-behavior 'yas--fallback)
2199 (error (concat "yasnippet fallback loop!\n"
2200 "This can happen when you bind `yas-expand' "
2201 "outside of the `yas-minor-mode-map'.")))
2202 ((eq yas-fallback-behavior 'call-other-command)
2203 (let* ((yas-fallback-behavior 'yas--fallback)
2204 ;; Also bind `yas-minor-mode' to prevent fallback
2205 ;; loops when other extensions use mechanisms similar
2206 ;; to `yas--keybinding-beyond-yasnippet'. (github #525
2209 (yas-minor-mode nil)
2210 (beyond-yasnippet (yas--keybinding-beyond-yasnippet)))
2211 (yas--message 4 "Falling back to %s" beyond-yasnippet)
2212 (assert (or (null beyond-yasnippet) (commandp beyond-yasnippet)))
2213 (setq this-original-command beyond-yasnippet)
2214 (when beyond-yasnippet
2215 (call-interactively beyond-yasnippet))))
2216 ((and (listp yas-fallback-behavior)
2217 (cdr yas-fallback-behavior)
2218 (eq 'apply (car yas-fallback-behavior)))
2219 (let ((command-or-fn (cadr yas-fallback-behavior))
2220 (args (cddr yas-fallback-behavior))
2221 (yas-fallback-behavior 'yas--fallback)
2222 (yas-minor-mode nil))
2224 (apply command-or-fn args)
2225 (when (commandp command-or-fn)
2226 (setq this-command command-or-fn)
2227 (call-interactively command-or-fn)))))
2229 ;; also return nil if all the other fallbacks have failed
2232 (defun yas--keybinding-beyond-yasnippet ()
2233 "Get current keys's binding as if YASsnippet didn't exist."
2234 (let* ((yas-minor-mode nil)
2235 (yas--direct-keymaps nil)
2236 (keys (this-single-command-keys)))
2237 (or (key-binding keys t)
2238 (key-binding (yas--fallback-translate-input keys) t))))
2240 (defun yas--fallback-translate-input (keys)
2241 "Emulate `read-key-sequence', at least what I think it does.
2243 Keys should be an untranslated key vector. Returns a translated
2244 vector of keys. FIXME not thoroughly tested."
2247 (while (< i (length keys))
2249 (translated local-function-key-map))
2250 (while (and (< j (length keys))
2252 (keymapp translated))
2253 (setq translated (cdr (assoc (aref keys j) (remove 'keymap translated)))
2255 (setq retval (vconcat retval (cond ((symbolp translated)
2257 ((vectorp translated)
2260 (substring keys i j)))))
2265 ;;; Utils for snippet development:
2267 (defun yas--all-templates (tables)
2268 "Get `yas--template' objects in TABLES, applicable for buffer and point.
2270 Honours `yas-choose-tables-first', `yas-choose-keys-first' and
2271 `yas-buffer-local-condition'"
2272 (when yas-choose-tables-first
2273 (setq tables (list (yas--prompt-for-table tables))))
2275 (if yas-choose-keys-first
2276 (let ((key (yas--prompt-for-keys
2277 (mapcan #'yas--table-all-keys tables))))
2279 (mapcan #'(lambda (table)
2280 (yas--fetch table key))
2282 (remove-duplicates (mapcan #'yas--table-templates tables)
2285 (defun yas-lookup-snippet (name &optional mode noerror)
2286 "Get the snippet content for the snippet NAME in MODE's tables.
2288 MODE defaults to the current buffer's `major-mode'. If NOERROR
2289 is non-nil, then don't signal an error if there isn't any snippet
2292 Honours `yas-buffer-local-condition'."
2293 (let* ((yas-choose-tables-first nil) ; avoid prompts
2294 (yas-choose-keys-first nil)
2295 (snippet (cl-find name (yas--all-templates
2296 (yas--get-snippet-tables mode))
2297 :key #'yas--template-name :test #'string=)))
2299 (snippet (yas--template-content snippet))
2301 (t (error "No snippet named: %s" name)))))
2303 (defun yas-insert-snippet (&optional no-condition)
2304 "Choose a snippet to expand, pop-up a list of choices according
2305 to `yas-prompt-functions'.
2307 With prefix argument NO-CONDITION, bypass filtering of snippets
2310 (setq yas--condition-cache-timestamp (current-time))
2311 (let* ((yas-buffer-local-condition (or (and no-condition
2313 yas-buffer-local-condition))
2314 (templates (yas--all-templates (yas--get-snippet-tables)))
2315 (yas--current-template (and templates
2316 (or (and (rest templates) ;; more than one template for same key
2317 (yas--prompt-for-template templates))
2319 (where (if (region-active-p)
2320 (cons (region-beginning) (region-end))
2321 (cons (point) (point)))))
2322 (if yas--current-template
2323 (yas-expand-snippet (yas--template-content yas--current-template)
2326 (yas--template-expand-env yas--current-template))
2327 (yas--message 3 "No snippets can be inserted here!"))))
2329 (defun yas-visit-snippet-file ()
2330 "Choose a snippet to edit, selection like `yas-insert-snippet'.
2332 Only success if selected snippet was loaded from a file. Put the
2333 visited file in `snippet-mode'."
2335 (let* ((yas-buffer-local-condition 'always)
2336 (templates (yas--all-templates (yas--get-snippet-tables)))
2337 (yas-prompt-functions '(yas-ido-prompt yas-completing-prompt))
2338 (template (and templates
2339 (or (yas--prompt-for-template templates
2340 "Choose a snippet template to edit: ")
2344 (yas--visit-snippet-file-1 template)
2345 (message "No snippets tables active!"))))
2347 (defun yas--visit-snippet-file-1 (template)
2348 "Helper for `yas-visit-snippet-file'."
2349 (let ((file (yas--template-file template)))
2350 (cond ((and file (file-readable-p file))
2351 (find-file-other-window file)
2353 (set (make-local-variable 'yas--editing-template) template))
2355 (message "Original file %s no longer exists!" file))
2357 (switch-to-buffer (format "*%s*"(yas--template-name template)))
2358 (let ((type 'snippet))
2359 (when (listp (yas--template-content template))
2360 (insert (format "# type: command\n"))
2361 (setq type 'command))
2362 (insert (format "# key: %s\n" (yas--template-key template)))
2363 (insert (format "# name: %s\n" (yas--template-name template)))
2364 (when (yas--template-keybinding template)
2365 (insert (format "# binding: %s\n" (yas--template-keybinding template))))
2366 (when (yas--template-expand-env template)
2367 (insert (format "# expand-env: %s\n" (yas--template-expand-env template))))
2368 (when (yas--template-condition template)
2369 (insert (format "# condition: %s\n" (yas--template-condition template))))
2371 (insert (if (eq type 'command)
2372 (pp-to-string (yas--template-content template))
2373 (yas--template-content template))))
2375 (set (make-local-variable 'yas--editing-template) template)))))
2377 (defun yas--guess-snippet-directories-1 (table)
2378 "Guess possible snippet subdirectories for TABLE."
2379 (cons (yas--table-name table)
2380 (mapcan #'(lambda (parent)
2381 (yas--guess-snippet-directories-1
2383 (yas--table-parents table))))
2385 (defun yas--guess-snippet-directories (&optional table)
2386 "Try to guess suitable directories based on the current active
2387 tables (or optional TABLE).
2389 Returns a list of elements (TABLE . DIRS) where TABLE is a
2390 `yas--table' object and DIRS is a list of all possible directories
2391 where snippets of table might exist."
2392 (let ((main-dir (replace-regexp-in-string
2394 (or (first (or (yas-snippet-dirs)
2395 (setq yas-snippet-dirs '("~/.emacs.d/snippets")))))))
2396 (tables (or (and table
2398 (yas--get-snippet-tables))))
2399 ;; HACK! the snippet table created here is actually registered!
2401 (unless (or table (gethash major-mode yas--tables))
2402 (push (yas--table-get-create major-mode)
2405 (mapcar #'(lambda (table)
2407 (mapcar #'(lambda (subdir)
2408 (concat main-dir "/" subdir))
2409 (yas--guess-snippet-directories-1 table))))
2412 (defun yas--make-directory-maybe (table-and-dirs &optional main-table-string)
2413 "Return a dir inside TABLE-AND-DIRS, prompts for creation if none exists."
2414 (or (some #'(lambda (dir) (when (file-directory-p dir) dir)) (cdr table-and-dirs))
2415 (let ((candidate (first (cdr table-and-dirs))))
2416 (unless (file-writable-p (file-name-directory candidate))
2417 (error (yas--format "%s is not writable." candidate)))
2418 (if (y-or-n-p (format "Guessed directory (%s) for%s%s table \"%s\" does not exist! Create? "
2420 (if (gethash (yas--table-mode (car table-and-dirs))
2424 (or main-table-string
2426 (yas--table-name (car table-and-dirs))))
2428 (make-directory candidate 'also-make-parents)
2429 ;; create the .yas-parents file here...
2432 (defun yas-new-snippet (&optional no-template)
2433 "Pops a new buffer for writing a snippet.
2435 Expands a snippet-writing snippet, unless the optional prefix arg
2436 NO-TEMPLATE is non-nil."
2438 (let ((guessed-directories (yas--guess-snippet-directories)))
2440 (switch-to-buffer "*new snippet*")
2442 (kill-all-local-variables)
2445 (set (make-local-variable 'yas--guessed-modes) (mapcar #'(lambda (d)
2446 (yas--table-mode (car d)))
2447 guessed-directories))
2448 (if (and (not no-template) yas-new-snippet-default)
2449 (yas-expand-snippet yas-new-snippet-default))))
2451 (defun yas--compute-major-mode-and-parents (file)
2452 "Given FILE, find the nearest snippet directory for a given mode.
2454 Returns a list (MODE-SYM PARENTS), the mode's symbol and a list
2455 representing one or more of the mode's parents.
2457 Note that MODE-SYM need not be the symbol of a real major mode,
2458 neither do the elements of PARENTS."
2459 (let* ((file-dir (and file
2460 (directory-file-name (or (some #'(lambda (special)
2461 (locate-dominating-file file special))
2465 (directory-file-name (file-name-directory file))))))
2466 (parents-file-name (concat file-dir "/.yas-parents"))
2467 (major-mode-name (and file-dir
2468 (file-name-nondirectory file-dir)))
2469 (major-mode-sym (or (and major-mode-name
2470 (intern major-mode-name))))
2471 (parents (when (file-readable-p parents-file-name)
2475 (insert-file-contents parents-file-name)
2476 (buffer-substring-no-properties (point-min)
2478 (when major-mode-sym
2479 (cons major-mode-sym (remove major-mode-sym parents)))))
2481 (defvar yas--editing-template nil
2482 "Supporting variable for `yas-load-snippet-buffer' and `yas--visit-snippet'.")
2484 (defvar yas--current-template nil
2485 "Holds the current template being expanded into a snippet.")
2487 (defvar yas--guessed-modes nil
2488 "List of guessed modes supporting `yas-load-snippet-buffer'.")
2490 (defun yas--read-table ()
2491 "Ask user for a snippet table, help with some guessing."
2492 (let ((prompt (if (and (featurep 'ido)
2494 'ido-completing-read 'completing-read)))
2495 (unless yas--guessed-modes
2496 (set (make-local-variable 'yas--guessed-modes)
2497 (or (yas--compute-major-mode-and-parents buffer-file-name))))
2499 (funcall prompt (format "Choose or enter a table (yas guesses %s): "
2500 (if yas--guessed-modes
2501 (first yas--guessed-modes)
2503 (mapcar #'symbol-name yas--guessed-modes)
2508 (if (first yas--guessed-modes)
2509 (symbol-name (first yas--guessed-modes)))))))
2511 (defun yas-load-snippet-buffer (table &optional interactive)
2512 "Parse and load current buffer's snippet definition into TABLE.
2514 TABLE is a symbol naming a passed to `yas--table-get-create'.
2516 When called interactively, prompt for the table name."
2517 (interactive (list (yas--read-table) t))
2519 ;; We have `yas--editing-template', this buffer's content comes from a
2520 ;; template which is already loaded and neatly positioned,...
2522 (yas--editing-template
2523 (yas--define-snippets-1 (yas--parse-template (yas--template-file yas--editing-template))
2524 (yas--template-table yas--editing-template)))
2525 ;; Try to use `yas--guessed-modes'. If we don't have that use the
2526 ;; value from `yas--compute-major-mode-and-parents'
2529 (unless yas--guessed-modes
2530 (set (make-local-variable 'yas--guessed-modes) (or (yas--compute-major-mode-and-parents buffer-file-name))))
2531 (let* ((table (yas--table-get-create table)))
2532 (set (make-local-variable 'yas--editing-template)
2533 (yas--define-snippets-1 (yas--parse-template buffer-file-name)
2536 (yas--message 3 "Snippet \"%s\" loaded for %s."
2537 (yas--template-name yas--editing-template)
2538 (yas--table-name (yas--template-table yas--editing-template)))))
2540 (defun yas-load-snippet-buffer-and-close (table &optional kill)
2541 "Load the snippet with `yas-load-snippet-buffer', possibly
2542 save, then `quit-window' if saved.
2544 If the snippet is new, ask the user whether (and where) to save
2545 it. If the snippet already has a file, just save it.
2547 The prefix argument KILL is passed to `quit-window'.
2549 Don't use this from a Lisp program, call `yas-load-snippet-buffer'
2550 and `kill-buffer' instead."
2551 (interactive (list (yas--read-table) current-prefix-arg))
2552 (yas-load-snippet-buffer table t)
2554 ;; Only offer to save this if it looks like a library or new
2555 ;; snippet (loaded from elisp, from a dir in `yas-snippet-dirs'
2556 ;; which is not the first, or from an unwritable file)
2558 (not (yas--template-file yas--editing-template))
2559 (not (file-writable-p (yas--template-file yas--editing-template)))
2560 (and (cdr-safe yas-snippet-dirs)
2561 (not (string-prefix-p (expand-file-name (car yas-snippet-dirs))
2562 (yas--template-file yas--editing-template)))))
2563 (y-or-n-p (yas--format "Looks like a library or new snippet. Save to new file? ")))
2564 (let* ((option (first (yas--guess-snippet-directories (yas--template-table yas--editing-template))))
2566 (yas--make-directory-maybe option))))
2568 (let ((default-file-name (or (and (yas--template-file yas--editing-template)
2569 (file-name-nondirectory (yas--template-file yas--editing-template)))
2570 (yas--template-name yas--editing-template))))
2571 (write-file (concat chosen "/"
2572 (read-from-minibuffer (format "File name to create in %s? " chosen)
2573 default-file-name)))
2574 (setf (yas--template-file yas--editing-template) buffer-file-name)))))
2575 (when buffer-file-name
2577 (quit-window kill)))
2579 (defun yas-tryout-snippet (&optional debug)
2580 "Test current buffer's snippet template in other buffer."
2582 (let* ((major-mode-and-parent (yas--compute-major-mode-and-parents buffer-file-name))
2583 (parsed (yas--parse-template))
2584 (test-mode (or (and (car major-mode-and-parent)
2585 (fboundp (car major-mode-and-parent))
2586 (car major-mode-and-parent))
2587 (first yas--guessed-modes)
2588 (intern (read-from-minibuffer (yas--format "Please input a mode: ")))))
2589 (yas--current-template
2592 (yas--make-template :table nil ;; no tables for ephemeral snippets
2594 :content (second parsed)
2595 :name (third parsed)
2596 :expand-env (sixth parsed)))))
2597 (cond (yas--current-template
2598 (let ((buffer-name (format "*testing snippet: %s*" (yas--template-name yas--current-template))))
2599 (kill-buffer (get-buffer-create buffer-name))
2600 (switch-to-buffer (get-buffer-create buffer-name))
2601 (setq buffer-undo-list nil)
2602 (condition-case nil (funcall test-mode) (error nil))
2604 (setq buffer-read-only nil)
2605 (yas-expand-snippet (yas--template-content yas--current-template)
2608 (yas--template-expand-env yas--current-template))
2610 (require 'yasnippet-debug nil t))
2611 (add-hook 'post-command-hook 'yas-debug-snippet-vars nil t))))
2613 (yas--message 3 "Cannot test snippet for unknown major mode")))))
2615 (defun yas-active-keys ()
2616 "Return all active trigger keys for current buffer and point."
2618 (remove-if-not #'stringp (mapcan #'yas--table-all-keys (yas--get-snippet-tables)))
2621 (defun yas--template-fine-group (template)
2622 (car (last (or (yas--template-group template)
2623 (yas--template-perm-group template)))))
2625 (defun yas-describe-tables (&optional choose)
2626 "Display snippets for each table."
2628 (let* ((by-name-hash (and choose
2629 (y-or-n-p "Show by namehash? ")))
2630 (buffer (get-buffer-create "*YASnippet tables*"))
2631 (active-tables (yas--get-snippet-tables))
2632 (remain-tables (let ((all))
2633 (maphash #'(lambda (_k v)
2634 (unless (find v active-tables)
2638 (table-lists (list active-tables remain-tables))
2639 (original-buffer (current-buffer))
2641 (yas--condition-cache-timestamp (current-time)))
2642 (with-current-buffer buffer
2643 (setq buffer-read-only nil)
2645 (cond ((not by-name-hash)
2646 (insert "YASnippet tables: \n")
2647 (while (and table-lists
2649 (dolist (table (car table-lists))
2650 (yas--describe-pretty-table table original-buffer))
2651 (setq table-lists (cdr table-lists))
2653 (yas--create-snippet-xrefs)
2654 (display-buffer buffer)
2655 (setq continue (and choose (y-or-n-p "Show also non-active tables? ")))))
2656 (yas--create-snippet-xrefs)
2660 (insert "\n\nYASnippet tables by NAMEHASH: \n")
2661 (dolist (table (append active-tables remain-tables))
2662 (insert (format "\nSnippet table `%s':\n\n" (yas--table-name table)))
2664 (maphash #'(lambda (k _v)
2666 (yas--table-hash table))
2668 (insert (format " key %s maps snippets: %s\n" key
2670 (maphash #'(lambda (k _v)
2672 (gethash key (yas--table-hash table)))
2675 (setq buffer-read-only t))
2676 (display-buffer buffer)))
2678 (defun yas--describe-pretty-table (table &optional original-buffer)
2679 (insert (format "\nSnippet table `%s'"
2680 (yas--table-name table)))
2681 (if (yas--table-parents table)
2682 (insert (format " parents: %s\n"
2683 (mapcar #'yas--table-name
2684 (yas--table-parents table))))
2686 (insert (make-string 100 ?-) "\n")
2687 (insert "group state name key binding\n")
2688 (let ((groups-hash (make-hash-table :test #'equal)))
2689 (maphash #'(lambda (_k v)
2690 (let ((group (or (yas--template-fine-group v)
2692 (when (yas--template-name v)
2694 (cons v (gethash group groups-hash))
2696 (yas--table-uuidhash table))
2698 #'(lambda (group templates)
2699 (setq group (truncate-string-to-width group 25 0 ? "..."))
2700 (insert (make-string 100 ?-) "\n")
2701 (dolist (p templates)
2702 (let ((name (truncate-string-to-width (propertize (format "\\\\snippet `%s'" (yas--template-name p))
2706 (setq group (make-string (length group) ? ))))
2707 (condition-string (let ((condition (yas--template-condition p)))
2710 (with-current-buffer original-buffer
2711 (if (yas--eval-condition condition)
2716 (insert condition-string " ")
2718 (if (string-match "\\.\\.\\.$" name)
2722 (insert (truncate-string-to-width (or (yas--template-key p) "")
2724 (insert (truncate-string-to-width (key-description (yas--template-keybinding p))
2731 ;;; User convenience functions, for using in `yas-key-syntaxes'
2733 (defun yas-try-key-from-whitespace (_start-point)
2734 "As `yas-key-syntaxes' element, look for whitespace delimited key.
2736 A newline will be considered whitespace even if the mode syntax
2737 marks it as something else (typically comment ender)."
2738 (skip-chars-backward "^[:space:]\n"))
2740 (defun yas-shortest-key-until-whitespace (_start-point)
2741 "Like `yas-longest-key-from-whitespace' but take the shortest key."
2742 (when (/= (skip-chars-backward "^[:space:]\n" (1- (point))) 0)
2745 (defun yas-longest-key-from-whitespace (start-point)
2746 "As `yas-key-syntaxes' element, look for longest key between point and whitespace.
2748 A newline will be considered whitespace even if the mode syntax
2749 marks it as something else (typically comment ender)."
2750 (if (= (point) start-point)
2751 (yas-try-key-from-whitespace start-point)
2753 (unless (<= start-point (1+ (point)))
2758 ;;; User convenience functions, for using in snippet definitions
2760 (defvar yas-modified-p nil
2761 "Non-nil if field has been modified by user or transformation.")
2763 (defvar yas-moving-away-p nil
2764 "Non-nil if user is about to exit field.")
2766 (defvar yas-text nil
2767 "Contains current field text.")
2769 (defun yas-substr (str pattern &optional subexp)
2770 "Search PATTERN in STR and return SUBEXPth match.
2772 If found, the content of subexp group SUBEXP (default 0) is
2773 returned, or else the original STR will be returned."
2774 (let ((grp (or subexp 0)))
2776 (if (string-match pattern str)
2777 (match-string-no-properties grp str)
2780 (defun yas-choose-value (&rest possibilities)
2781 "Prompt for a string in POSSIBILITIES and return it.
2783 The last element of POSSIBILITIES may be a list of strings."
2784 (unless (or yas-moving-away-p
2786 (let* ((last-link (last possibilities))
2787 (last-elem (car last-link)))
2788 (when (listp last-elem)
2789 (setcar last-link (car last-elem))
2790 (setcdr last-link (cdr last-elem))))
2791 (some #'(lambda (fn)
2792 (funcall fn "Choose: " possibilities))
2793 yas-prompt-functions)))
2795 (defun yas-key-to-value (alist)
2796 (unless (or yas-moving-away-p
2798 (let ((key (read-key-sequence "")))
2800 (or (cdr (find key alist :key #'car :test #'string=))
2803 (defun yas-throw (text)
2804 "Throw a yas--exception with TEXT as the reason."
2805 (throw 'yas--exception (cons 'yas--exception text)))
2807 (defun yas-verify-value (possibilities)
2808 "Verify that the current field value is in POSSIBILITIES.
2810 Otherwise throw exception."
2811 (when (and yas-moving-away-p (notany #'(lambda (pos) (string= pos yas-text)) possibilities))
2812 (yas-throw (yas--format "Field only allows %s" possibilities))))
2814 (defun yas-field-value (number)
2815 "Get the string for field with NUMBER.
2817 Use this in primary and mirror transformations to tget."
2818 (let* ((snippet (car (yas--snippets-at-point)))
2820 (yas--snippet-find-field snippet number))))
2822 (yas--field-text-for-display field))))
2825 "Return `yas-text' if that exists and is non-empty, else nil."
2827 (not (string= "" yas-text)))
2830 (defun yas-selected-text ()
2831 "Return `yas-selected-text' if that exists and is non-empty, else nil."
2832 (if (and yas-selected-text
2833 (not (string= "" yas-selected-text)))
2836 (defun yas--get-field-once (number &optional transform-fn)
2837 (unless yas-modified-p
2839 (funcall transform-fn (yas-field-value number))
2840 (yas-field-value number))))
2842 (defun yas-default-from-field (number)
2843 (unless yas-modified-p
2844 (yas-field-value number)))
2846 (defun yas-inside-string ()
2847 "Return non-nil if the point is inside a string according to font-lock."
2848 (equal 'font-lock-string-face (get-char-property (1- (point)) 'face)))
2850 (defun yas-unimplemented (&optional missing-feature)
2851 (if yas--current-template
2852 (if (y-or-n-p (format "This snippet is unimplemented (missing %s) Visit the snippet definition? "
2855 (yas--visit-snippet-file-1 yas--current-template))
2856 (message "No implementation. Missing %s" (or missing-feature "something"))))
2859 ;;; Snippet expansion and field management
2861 (defvar yas--active-field-overlay nil
2862 "Overlays the currently active field.")
2864 (defvar yas--field-protection-overlays nil
2865 "Two overlays protect the current active field.")
2867 (defvar yas-selected-text nil
2868 "The selected region deleted on the last snippet expansion.")
2870 (defvar yas--start-column nil
2871 "The column where the snippet expansion started.")
2873 (make-variable-buffer-local 'yas--active-field-overlay)
2874 (make-variable-buffer-local 'yas--field-protection-overlays)
2875 (put 'yas--active-field-overlay 'permanent-local t)
2876 (put 'yas--field-protection-overlays 'permanent-local t)
2878 (defstruct (yas--snippet (:constructor yas--make-snippet ()))
2884 (id (yas--snippet-next-id) :read-only t)
2885 (control-overlay nil)
2887 ;; stacked expansion: the `previous-active-field' slot saves the
2888 ;; active field where the child expansion took place
2889 previous-active-field
2892 (defstruct (yas--field (:constructor yas--make-field (number start end parent-field)))
2895 NUMBER is the field number.
2896 START and END are mostly buffer markers, but see \"apropos markers-to-points\".
2897 PARENT-FIELD is a `yas--field' this field is nested under, or nil.
2898 MIRRORS is a list of `yas--mirror's
2899 TRANSFORM is a lisp form.
2900 MODIFIED-P is a boolean set to true once user inputs text.
2901 NEXT is another `yas--field' or `yas--mirror' or `yas--exit'.
2912 (defstruct (yas--mirror (:constructor yas--make-mirror (start end transform)))
2915 START and END are mostly buffer markers, but see \"apropos markers-to-points\".
2916 TRANSFORM is a lisp form.
2917 PARENT-FIELD is a `yas--field' this mirror is nested under, or nil.
2918 NEXT is another `yas--field' or `yas--mirror' or `yas--exit'
2919 DEPTH is a count of how many nested mirrors can affect this mirror"
2926 (defstruct (yas--exit (:constructor yas--make-exit (marker)))
2930 (defun yas--apply-transform (field-or-mirror field &optional empty-on-nil-p)
2931 "Calculate transformed string for FIELD-OR-MIRROR from FIELD.
2933 If there is no transform for ht field, return nil.
2935 If there is a transform but it returns nil, return the empty
2936 string iff EMPTY-ON-NIL-P is true."
2937 (let* ((yas-text (yas--field-text-for-display field))
2938 (yas-modified-p (yas--field-modified-p field))
2939 (yas-moving-away-p nil)
2940 (transform (if (yas--mirror-p field-or-mirror)
2941 (yas--mirror-transform field-or-mirror)
2942 (yas--field-transform field-or-mirror)))
2943 (start-point (if (yas--mirror-p field-or-mirror)
2944 (yas--mirror-start field-or-mirror)
2945 (yas--field-start field-or-mirror)))
2946 (transformed (and transform
2948 (goto-char start-point)
2949 (let ((ret (yas--eval-lisp transform)))
2950 (or ret (and empty-on-nil-p "")))))))
2953 (defsubst yas--replace-all (from to &optional text)
2954 "Replace all occurrences from FROM to TO.
2956 With optional string TEXT do it in that string."
2958 (replace-regexp-in-string (regexp-quote from) to text t t)
2959 (goto-char (point-min))
2960 (while (search-forward from nil t)
2961 (replace-match to t t text))))
2963 (defun yas--snippet-find-field (snippet number)
2964 (find-if #'(lambda (field)
2965 (eq number (yas--field-number field)))
2966 (yas--snippet-fields snippet)))
2968 (defun yas--snippet-sort-fields (snippet)
2969 "Sort the fields of SNIPPET in navigation order."
2970 (setf (yas--snippet-fields snippet)
2971 (sort (yas--snippet-fields snippet)
2972 #'yas--snippet-field-compare)))
2974 (defun yas--snippet-field-compare (field1 field2)
2975 "Compare FIELD1 and FIELD2.
2977 The field with a number is sorted first. If they both have a
2978 number, compare through the number. If neither have, compare
2979 through the field's start point"
2980 (let ((n1 (yas--field-number field1))
2981 (n2 (yas--field-number field2)))
2984 (or (zerop n2) (and (not (zerop n1))
2989 (< (yas--field-start field1)
2990 (yas--field-start field2))))))
2992 (defun yas--field-probably-deleted-p (snippet field)
2993 "Guess if SNIPPET's FIELD should be skipped."
2995 ;; field must be zero length
2997 (zerop (- (yas--field-start field) (yas--field-end field)))
2998 ;; field must have been modified
3000 (yas--field-modified-p field)
3003 ;; 1) it's a nested field
3005 (yas--field-parent-field field)
3006 ;; 2) ends just before the snippet end
3008 (and (eq field (car (last (yas--snippet-fields snippet))))
3009 (= (yas--field-start field) (overlay-end (yas--snippet-control-overlay snippet)))))
3010 ;; the field numbered 0, just before the exit marker, should
3013 (not (and (yas--field-number field)
3014 (zerop (yas--field-number field))))))
3016 (defun yas--snippets-at-point (&optional all-snippets)
3017 "Return a sorted list of snippets at point.
3019 The most recently-inserted snippets are returned first."
3021 (remove nil (remove-duplicates (mapcar #'(lambda (ov)
3022 (overlay-get ov 'yas--snippet))
3024 (overlays-in (point-min) (point-max))
3025 (nconc (overlays-at (point)) (overlays-at (1- (point))))))))
3027 (<= (yas--snippet-id s2) (yas--snippet-id s1)))))
3029 (defun yas-next-field-or-maybe-expand ()
3030 "Try to expand a snippet at a key before point.
3032 Otherwise delegate to `yas-next-field'."
3034 (if yas-triggers-in-field
3035 (let ((yas-fallback-behavior 'return-nil)
3036 (active-field (overlay-get yas--active-field-overlay 'yas--field)))
3038 (unless (yas-expand-from-trigger-key active-field)
3042 (defun yas-next-field (&optional arg)
3043 "Navigate to the ARGth next field.
3045 If there's none, exit the snippet."
3049 (snippet (first (yas--snippets-at-point)))
3050 (active-field (overlay-get yas--active-field-overlay 'yas--field))
3051 (live-fields (remove-if #'(lambda (field)
3052 (and (not (eq field active-field))
3053 (yas--field-probably-deleted-p snippet field)))
3054 (yas--snippet-fields snippet)))
3055 (active-field-pos (position active-field live-fields))
3056 (target-pos (and active-field-pos (+ arg active-field-pos)))
3057 (target-field (and target-pos (nth target-pos live-fields))))
3058 ;; First check if we're moving out of a field with a transform
3060 (when (and active-field
3061 (yas--field-transform active-field))
3062 (let* ((yas-moving-away-p t)
3063 (yas-text (yas--field-text-for-display active-field))
3064 (yas-modified-p (yas--field-modified-p active-field)))
3065 ;; primary field transform: exit call to field-transform
3066 (yas--eval-lisp (yas--field-transform active-field))))
3067 ;; Now actually move...
3068 (cond ((and target-pos (>= target-pos (length live-fields)))
3069 (yas-exit-snippet snippet))
3071 (yas--move-to-field snippet target-field))
3075 (defun yas--place-overlays (snippet field)
3076 "Correctly place overlays for SNIPPET's FIELD."
3077 (yas--make-move-field-protection-overlays snippet field)
3078 (yas--make-move-active-field-overlay snippet field))
3080 (defun yas--move-to-field (snippet field)
3081 "Update SNIPPET to move to field FIELD.
3083 Also create some protection overlays"
3084 (goto-char (yas--field-start field))
3085 (yas--place-overlays snippet field)
3086 (overlay-put yas--active-field-overlay 'yas--field field)
3087 (let ((number (yas--field-number field)))
3088 ;; check for the special ${0: ...} field
3089 (if (and number (zerop number))
3091 (set-mark (yas--field-end field))
3092 (setf (yas--snippet-force-exit snippet)
3093 (or (yas--field-transform field)
3095 ;; make this field active
3096 (setf (yas--snippet-active-field snippet) field)
3097 ;; primary field transform: first call to snippet transform
3098 (unless (yas--field-modified-p field)
3099 (if (yas--field-update-display field)
3100 (yas--update-mirrors snippet)
3101 (setf (yas--field-modified-p field) nil))))))
3103 (defun yas-prev-field ()
3104 "Navigate to prev field. If there's none, exit the snippet."
3106 (yas-next-field -1))
3108 (defun yas-abort-snippet (&optional snippet)
3110 (let ((snippet (or snippet
3111 (car (yas--snippets-at-point)))))
3113 (setf (yas--snippet-force-exit snippet) t))))
3115 (defun yas-exit-snippet (snippet)
3116 "Goto exit-marker of SNIPPET."
3117 (interactive (list (first (yas--snippets-at-point))))
3119 (setf (yas--snippet-force-exit snippet) t)
3120 (goto-char (if (yas--snippet-exit snippet)
3121 (yas--exit-marker (yas--snippet-exit snippet))
3122 (overlay-end (yas--snippet-control-overlay snippet))))))
3124 (defun yas-exit-all-snippets ()
3125 "Exit all snippets."
3127 (mapc #'(lambda (snippet)
3128 (yas-exit-snippet snippet)
3129 (yas--check-commit-snippet))
3130 (yas--snippets-at-point 'all-snippets)))
3133 ;;; Some low level snippet-routines:
3135 (defvar yas--inhibit-overlay-hooks nil
3136 "Bind this temporarily to non-nil to prevent running `yas--on-*-modification'.")
3138 (defmacro yas--inhibit-overlay-hooks (&rest body)
3139 "Run BODY with `yas--inhibit-overlay-hooks' set to t."
3140 (declare (indent 0))
3141 `(let ((yas--inhibit-overlay-hooks t))
3144 (defvar yas-snippet-beg nil "Beginning position of the last snippet committed.")
3145 (defvar yas-snippet-end nil "End position of the last snippet committed.")
3147 (defun yas--commit-snippet (snippet)
3148 "Commit SNIPPET, but leave point as it is.
3150 This renders the snippet as ordinary text."
3152 (let ((control-overlay (yas--snippet-control-overlay snippet)))
3154 ;; Save the end of the moribund snippet in case we need to revive it
3155 ;; its original expansion.
3157 (when (and control-overlay
3158 (overlay-buffer control-overlay))
3159 (setq yas-snippet-beg (overlay-start control-overlay))
3160 (setq yas-snippet-end (overlay-end control-overlay))
3161 (delete-overlay control-overlay))
3163 (yas--inhibit-overlay-hooks
3164 (when yas--active-field-overlay
3165 (delete-overlay yas--active-field-overlay))
3166 (when yas--field-protection-overlays
3167 (mapc #'delete-overlay yas--field-protection-overlays)))
3169 ;; stacked expansion: if the original expansion took place from a
3170 ;; field, make sure we advance it here at least to
3171 ;; `yas-snippet-end'...
3173 (let ((previous-field (yas--snippet-previous-active-field snippet)))
3174 (when (and yas-snippet-end previous-field)
3175 (yas--advance-end-maybe previous-field yas-snippet-end)))
3177 ;; Convert all markers to points,
3179 (yas--markers-to-points snippet)
3181 ;; Take care of snippet revival
3183 (if yas-snippet-revival
3184 (push `(apply yas--snippet-revive ,yas-snippet-beg ,yas-snippet-end ,snippet)
3186 ;; Dismember the snippet... this is useful if we get called
3187 ;; again from `yas--take-care-of-redo'....
3188 (setf (yas--snippet-fields snippet) nil)))
3190 (yas--message 3 "Snippet %s exited." (yas--snippet-id snippet)))
3192 (defun yas--safely-run-hooks (hook-var)
3193 (condition-case error
3194 (run-hooks hook-var)
3196 (yas--message 3 "%s error: %s" hook-var (error-message-string error)))))
3199 (defun yas--check-commit-snippet ()
3200 "Check if point exited the currently active field of the snippet.
3202 If so cleans up the whole snippet up."
3203 (let* ((snippets (yas--snippets-at-point 'all-snippets))
3204 (snippets-left snippets)
3205 (snippet-exit-transform))
3206 (dolist (snippet snippets)
3207 (let ((active-field (yas--snippet-active-field snippet)))
3208 (setq snippet-exit-transform (yas--snippet-force-exit snippet))
3209 (cond ((or snippet-exit-transform
3210 (not (and active-field (yas--field-contains-point-p active-field))))
3211 (setq snippets-left (delete snippet snippets-left))
3212 (setf (yas--snippet-force-exit snippet) nil)
3213 (yas--commit-snippet snippet))
3215 (or (not yas--active-field-overlay)
3216 (not (overlay-buffer yas--active-field-overlay))))
3218 ;; stacked expansion: this case is mainly for recent
3219 ;; snippet exits that place us back int the field of
3223 (yas--move-to-field snippet active-field)
3224 (yas--update-mirrors snippet)))
3227 (unless (or (null snippets) snippets-left)
3228 (if snippet-exit-transform
3229 (yas--eval-lisp-no-saves snippet-exit-transform))
3230 (yas--safely-run-hooks 'yas-after-exit-snippet-hook))))
3232 ;; Apropos markers-to-points:
3234 ;; This was found useful for performance reasons, so that an
3235 ;; excessive number of live markers aren't kept around in the
3236 ;; `buffer-undo-list'. However, in `markers-to-points', the
3237 ;; set-to-nil markers can't simply be discarded and replaced with
3238 ;; fresh ones in `points-to-markers'. The original marker that was
3239 ;; just set to nil has to be reused.
3241 ;; This shouldn't bring horrible problems with undo/redo, but it
3244 (defun yas--markers-to-points (snippet)
3245 "Convert all markers in SNIPPET to a cons (POINT . MARKER)
3246 where POINT is the original position of the marker and MARKER is
3247 the original marker object with the position set to nil."
3248 (dolist (field (yas--snippet-fields snippet))
3249 (let ((start (marker-position (yas--field-start field)))
3250 (end (marker-position (yas--field-end field))))
3251 (set-marker (yas--field-start field) nil)
3252 (set-marker (yas--field-end field) nil)
3253 (setf (yas--field-start field) (cons start (yas--field-start field)))
3254 (setf (yas--field-end field) (cons end (yas--field-end field))))
3255 (dolist (mirror (yas--field-mirrors field))
3256 (let ((start (marker-position (yas--mirror-start mirror)))
3257 (end (marker-position (yas--mirror-end mirror))))
3258 (set-marker (yas--mirror-start mirror) nil)
3259 (set-marker (yas--mirror-end mirror) nil)
3260 (setf (yas--mirror-start mirror) (cons start (yas--mirror-start mirror)))
3261 (setf (yas--mirror-end mirror) (cons end (yas--mirror-end mirror))))))
3262 (let ((snippet-exit (yas--snippet-exit snippet)))
3264 (let ((exit (marker-position (yas--exit-marker snippet-exit))))
3265 (set-marker (yas--exit-marker snippet-exit) nil)
3266 (setf (yas--exit-marker snippet-exit) (cons exit (yas--exit-marker snippet-exit)))))))
3268 (defun yas--points-to-markers (snippet)
3269 "Convert all cons (POINT . MARKER) in SNIPPET to markers.
3271 This is done by setting MARKER to POINT with `set-marker'."
3272 (dolist (field (yas--snippet-fields snippet))
3273 (setf (yas--field-start field) (set-marker (cdr (yas--field-start field))
3274 (car (yas--field-start field))))
3275 (setf (yas--field-end field) (set-marker (cdr (yas--field-end field))
3276 (car (yas--field-end field))))
3277 (dolist (mirror (yas--field-mirrors field))
3278 (setf (yas--mirror-start mirror) (set-marker (cdr (yas--mirror-start mirror))
3279 (car (yas--mirror-start mirror))))
3280 (setf (yas--mirror-end mirror) (set-marker (cdr (yas--mirror-end mirror))
3281 (car (yas--mirror-end mirror))))))
3282 (let ((snippet-exit (yas--snippet-exit snippet)))
3284 (setf (yas--exit-marker snippet-exit) (set-marker (cdr (yas--exit-marker snippet-exit))
3285 (car (yas--exit-marker snippet-exit)))))))
3287 (defun yas--field-contains-point-p (field &optional point)
3288 (let ((point (or point
3290 (and (>= point (yas--field-start field))
3291 (<= point (yas--field-end field)))))
3293 (defun yas--field-text-for-display (field)
3294 "Return the propertized display text for field FIELD."
3295 (buffer-substring (yas--field-start field) (yas--field-end field)))
3297 (defun yas--undo-in-progress ()
3298 "True if some kind of undo is in progress."
3299 (or undo-in-progress
3300 (eq this-command 'undo)
3301 (eq this-command 'redo)))
3303 (defun yas--make-control-overlay (snippet start end)
3304 "Create the control overlay that surrounds the snippet and
3306 (let ((overlay (make-overlay start
3311 (overlay-put overlay 'keymap yas-keymap)
3312 (overlay-put overlay 'priority 100)
3313 (overlay-put overlay 'yas--snippet snippet)
3316 (defun yas-skip-and-clear-or-delete-char (&optional field)
3317 "Clears unmodified field if at field start, skips to next tab.
3319 Otherwise deletes a character normally by calling `delete-char'."
3321 (let ((field (or field
3322 (and yas--active-field-overlay
3323 (overlay-buffer yas--active-field-overlay)
3324 (overlay-get yas--active-field-overlay 'yas--field)))))
3326 (not (yas--field-modified-p field))
3327 (eq (point) (marker-position (yas--field-start field))))
3328 (yas--skip-and-clear field)
3331 (call-interactively 'delete-char)))))
3333 (defun yas--skip-and-clear (field)
3334 "Deletes the region of FIELD and sets it's modified state to t."
3335 ;; Just before skipping-and-clearing the field, mark its children
3336 ;; fields as modified, too. If the children have mirrors-in-fields
3337 ;; this prevents them from updating erroneously (we're skipping and
3340 (yas--mark-this-and-children-modified field)
3341 (delete-region (yas--field-start field) (yas--field-end field)))
3343 (defun yas--mark-this-and-children-modified (field)
3344 (setf (yas--field-modified-p field) t)
3345 (let ((fom (yas--field-next field)))
3347 (yas--fom-parent-field fom))
3348 (when (and (eq (yas--fom-parent-field fom) field)
3350 (yas--mark-this-and-children-modified fom))
3351 (setq fom (yas--fom-next fom)))))
3353 (defun yas--make-move-active-field-overlay (snippet field)
3354 "Place the active field overlay in SNIPPET's FIELD.
3356 Move the overlay, or create it if it does not exit."
3357 (if (and yas--active-field-overlay
3358 (overlay-buffer yas--active-field-overlay))
3359 (move-overlay yas--active-field-overlay
3360 (yas--field-start field)
3361 (yas--field-end field))
3362 (setq yas--active-field-overlay
3363 (make-overlay (yas--field-start field)
3364 (yas--field-end field)
3366 (overlay-put yas--active-field-overlay 'priority 100)
3367 (overlay-put yas--active-field-overlay 'face 'yas-field-highlight-face)
3368 (overlay-put yas--active-field-overlay 'yas--snippet snippet)
3369 (overlay-put yas--active-field-overlay 'modification-hooks '(yas--on-field-overlay-modification))
3370 (overlay-put yas--active-field-overlay 'insert-in-front-hooks
3371 '(yas--on-field-overlay-modification))
3372 (overlay-put yas--active-field-overlay 'insert-behind-hooks
3373 '(yas--on-field-overlay-modification))))
3375 (defun yas--on-field-overlay-modification (overlay after? _beg _end &optional _length)
3376 "Clears the field and updates mirrors, conditionally.
3378 Only clears the field if it hasn't been modified and it point it
3379 at field start. This hook doesn't do anything if an undo is in
3381 (unless (or yas--inhibit-overlay-hooks
3382 (yas--undo-in-progress))
3383 (let* ((field (overlay-get overlay 'yas--field))
3384 (snippet (overlay-get yas--active-field-overlay 'yas--snippet)))
3386 (yas--advance-end-maybe field (overlay-end overlay))
3388 (yas--field-update-display field))
3389 (yas--update-mirrors snippet))
3391 (when (and (not after?)
3392 (not (yas--field-modified-p field))
3393 (eq (point) (if (markerp (yas--field-start field))
3394 (marker-position (yas--field-start field))
3395 (yas--field-start field))))
3396 (yas--skip-and-clear field))
3397 (setf (yas--field-modified-p field) t))))))
3399 ;;; Apropos protection overlays:
3401 ;; These exist for nasty users who will try to delete parts of the
3402 ;; snippet outside the active field. Actual protection happens in
3403 ;; `yas--on-protection-overlay-modification'.
3405 ;; As of github #537 this no longer inhibits the command by issuing an
3406 ;; error: all the snippets at point, including nested snippets, are
3407 ;; automatically commited and the current command can proceed.
3409 (defun yas--make-move-field-protection-overlays (snippet field)
3410 "Place protection overlays surrounding SNIPPET's FIELD.
3412 Move the overlays, or create them if they do not exit."
3413 (let ((start (yas--field-start field))
3414 (end (yas--field-end field)))
3415 ;; First check if the (1+ end) is contained in the buffer,
3416 ;; otherwise we'll have to do a bit of cheating and silently
3417 ;; insert a newline. the `(1+ (buffer-size))' should prevent this
3418 ;; when using stacked expansion
3420 (when (< (buffer-size) end)
3422 (yas--inhibit-overlay-hooks
3423 (goto-char (point-max))
3425 ;; go on to normal overlay creation/moving
3427 (cond ((and yas--field-protection-overlays
3428 (every #'overlay-buffer yas--field-protection-overlays))
3429 (move-overlay (first yas--field-protection-overlays) (1- start) start)
3430 (move-overlay (second yas--field-protection-overlays) end (1+ end)))
3432 (setq yas--field-protection-overlays
3433 (list (make-overlay (1- start) start nil t nil)
3434 (make-overlay end (1+ end) nil t nil)))
3435 (dolist (ov yas--field-protection-overlays)
3436 (overlay-put ov 'face 'yas--field-debug-face)
3437 (overlay-put ov 'yas--snippet snippet)
3438 ;; (overlay-put ov 'evaporate t)
3439 (overlay-put ov 'modification-hooks '(yas--on-protection-overlay-modification)))))))
3441 (defun yas--on-protection-overlay-modification (_overlay after? _beg _end &optional _length)
3442 "Signals a snippet violation, then issues error.
3444 The error should be ignored in `debug-ignored-errors'"
3445 (unless (or yas--inhibit-overlay-hooks
3447 (yas--undo-in-progress))
3448 (let ((snippets (yas--snippets-at-point)))
3449 (yas--message 3 "Comitting snippets. Action would destroy a protection overlay.")
3450 (cl-loop for snippet in snippets
3451 do (yas--commit-snippet snippet)))))
3453 (add-to-list 'debug-ignored-errors "^Exit the snippet first!$")
3456 ;;; Snippet expansion and "stacked" expansion:
3458 ;; Stacked expansion is when you try to expand a snippet when already
3459 ;; inside a snippet expansion.
3461 ;; The parent snippet does not run its fields modification hooks
3462 ;; (`yas--on-field-overlay-modification' and
3463 ;; `yas--on-protection-overlay-modification') while the child snippet
3464 ;; is active. This means, among other things, that the mirrors of the
3465 ;; parent snippet are not updated, this only happening when one exits
3466 ;; the child snippet.
3468 ;; Unfortunately, this also puts some ugly (and not fully-tested)
3469 ;; bits of code in `yas-expand-snippet' and
3470 ;; `yas--commit-snippet'. I've tried to mark them with "stacked
3473 ;; This was thought to be safer in an undo/redo perspective, but
3474 ;; maybe the correct implementation is to make the globals
3475 ;; `yas--active-field-overlay' and `yas--field-protection-overlays' be
3476 ;; snippet-local and be active even while the child snippet is
3477 ;; running. This would mean a lot of overlay modification hooks
3478 ;; running, but if managed correctly (including overlay priorities)
3479 ;; they should account for all situations...
3481 (defun yas-expand-snippet (content &optional start end expand-env)
3482 "Expand snippet CONTENT at current point.
3484 Text between START and END will be deleted before inserting
3485 template. EXPAND-ENV is a list of (SYM VALUE) let-style dynamic bindings
3486 considered when expanding the snippet."
3487 (cl-assert (and yas-minor-mode
3488 (memq 'yas--post-command-handler post-command-hook))
3490 "[yas] `yas-expand-snippet' needs properly setup `yas-minor-mode'")
3491 (run-hooks 'yas-before-expand-snippet-hook)
3494 (let* ((yas-selected-text (or yas-selected-text
3495 (and (region-active-p)
3496 (buffer-substring-no-properties (region-beginning)
3499 (and (region-active-p)
3503 (and (region-active-p)
3506 (to-delete (and start
3508 (buffer-substring-no-properties start end)))
3511 (setq yas--indent-original-column (current-column))
3512 ;; Delete the region to delete, this *does* get undo-recorded.
3514 (when (and to-delete
3516 (delete-region start end))
3518 (cond ((listp content)
3519 ;; x) This is a snippet-command
3521 (yas--eval-lisp-no-saves content))
3523 ;; x) This is a snippet-snippet :-)
3525 ;; Narrow the region down to the content, shoosh the
3526 ;; `buffer-undo-list', and create the snippet, the new
3527 ;; snippet updates its mirrors once, so we are left with
3528 ;; some plain text. The undo action for deleting this
3529 ;; plain text will get recorded at the end.
3531 ;; stacked expansion: also shoosh the overlay modification hooks
3532 (let ((buffer-undo-list t))
3533 ;; snippet creation might evaluate users elisp, which
3534 ;; might generate errors, so we have to be ready to catch
3535 ;; them mostly to make the undo information
3537 (setq yas--start-column (current-column))
3538 (yas--inhibit-overlay-hooks
3541 (eval `(let* ,expand-env
3543 (yas--snippet-create start (point))))
3545 (yas--snippet-create start (point))))))
3547 ;; stacked-expansion: This checks for stacked expansion, save the
3548 ;; `yas--previous-active-field' and advance its boundary.
3550 (let ((existing-field (and yas--active-field-overlay
3551 (overlay-buffer yas--active-field-overlay)
3552 (overlay-get yas--active-field-overlay 'yas--field))))
3553 (when existing-field
3554 (setf (yas--snippet-previous-active-field snippet) existing-field)
3555 (yas--advance-end-maybe existing-field (overlay-end yas--active-field-overlay))))
3557 ;; Exit the snippet immediately if no fields
3559 (unless (yas--snippet-fields snippet)
3560 (yas-exit-snippet snippet))
3562 ;; Push two undo actions: the deletion of the inserted contents of
3563 ;; the new snippet (without the "key") followed by an apply of
3564 ;; `yas--take-care-of-redo' on the newly inserted snippet boundaries
3566 ;; A small exception, if `yas-also-auto-indent-first-line'
3567 ;; is t and `yas--indent' decides to indent the line to a
3568 ;; point before the actual expansion point, undo would be
3569 ;; messed up. We call the early point "newstart"". case,
3570 ;; and attempt to fix undo.
3572 (let ((newstart (overlay-start (yas--snippet-control-overlay snippet)))
3573 (end (overlay-end (yas--snippet-control-overlay snippet))))
3574 (when (< newstart start)
3575 (push (cons (make-string (- start newstart) ? ) newstart) buffer-undo-list))
3576 (push (cons newstart end) buffer-undo-list)
3577 (push `(apply yas--take-care-of-redo ,start ,end ,snippet)
3579 ;; Now, schedule a move to the first field
3581 (let ((first-field (car (yas--snippet-fields snippet))))
3583 (sit-for 0) ;; fix issue 125
3584 (yas--move-to-field snippet first-field)))
3585 (yas--message 3 "snippet expanded.")
3588 (defun yas--take-care-of-redo (_beg _end snippet)
3589 "Commits SNIPPET, which in turn pushes an undo action for reviving it.
3591 Meant to exit in the `buffer-undo-list'."
3592 ;; slightly optimize: this action is only needed for snippets with
3593 ;; at least one field
3594 (when (yas--snippet-fields snippet)
3595 (yas--commit-snippet snippet)))
3597 (defun yas--snippet-revive (beg end snippet)
3598 "Revives SNIPPET and creates a control overlay from BEG to END.
3600 BEG and END are, we hope, the original snippets boundaries.
3601 All the markers/points exiting existing inside SNIPPET should point
3602 to their correct locations *at the time the snippet is revived*.
3604 After revival, push the `yas--take-care-of-redo' in the
3606 ;; Reconvert all the points to markers
3608 (yas--points-to-markers snippet)
3609 ;; When at least one editable field existed in the zombie snippet,
3610 ;; try to revive the whole thing...
3612 (let ((target-field (or (yas--snippet-active-field snippet)
3613 (car (yas--snippet-fields snippet)))))
3615 (setf (yas--snippet-control-overlay snippet) (yas--make-control-overlay snippet beg end))
3616 (overlay-put (yas--snippet-control-overlay snippet) 'yas--snippet snippet)
3618 (yas--move-to-field snippet target-field)
3620 (push `(apply yas--take-care-of-redo ,beg ,end ,snippet)
3621 buffer-undo-list))))
3623 (defun yas--snippet-create (begin end)
3624 "Create a snippet from a template inserted at BEGIN to END.
3626 Returns the newly created snippet."
3628 (narrow-to-region begin end)
3629 (let ((snippet (yas--make-snippet)))
3631 (yas--snippet-parse-create snippet)
3633 ;; Sort and link each field
3634 (yas--snippet-sort-fields snippet)
3636 ;; Create keymap overlay for snippet
3637 (setf (yas--snippet-control-overlay snippet)
3638 (yas--make-control-overlay snippet (point-min) (point-max)))
3641 (goto-char (point-max))
3646 ;;; Apropos adjacencies and "fom's":
3648 ;; Once the $-constructs bits like "$n" and "${:n" are deleted in the
3649 ;; recently expanded snippet, we might actually have many fields,
3650 ;; mirrors (and the snippet exit) in the very same position in the
3651 ;; buffer. Therefore we need to single-link the
3652 ;; fields-or-mirrors-or-exit (which I have abbreviated to "fom")
3653 ;; according to their original positions in the buffer.
3655 ;; Then we have operation `yas--advance-end-maybe' and
3656 ;; `yas--advance-start-maybe', which conditionally push the starts and
3657 ;; ends of these foms down the chain.
3659 ;; This allows for like the printf with the magic ",":
3661 ;; printf ("${1:%s}\\n"${1:$(if (string-match "%" text) "," "\);")} \
3662 ;; $2${1:$(if (string-match "%" text) "\);" "")}$0
3664 (defun yas--fom-start (fom)
3665 (cond ((yas--field-p fom)
3666 (yas--field-start fom))
3667 ((yas--mirror-p fom)
3668 (yas--mirror-start fom))
3670 (yas--exit-marker fom))))
3672 (defun yas--fom-end (fom)
3673 (cond ((yas--field-p fom)
3674 (yas--field-end fom))
3675 ((yas--mirror-p fom)
3676 (yas--mirror-end fom))
3678 (yas--exit-marker fom))))
3680 (defun yas--fom-next (fom)
3681 (cond ((yas--field-p fom)
3682 (yas--field-next fom))
3683 ((yas--mirror-p fom)
3684 (yas--mirror-next fom))
3686 (yas--exit-next fom))))
3688 (defun yas--fom-parent-field (fom)
3689 (cond ((yas--field-p fom)
3690 (yas--field-parent-field fom))
3691 ((yas--mirror-p fom)
3692 (yas--mirror-parent-field fom))
3696 (defun yas--calculate-adjacencies (snippet)
3697 "Calculate adjacencies for fields or mirrors of SNIPPET.
3699 This is according to their relative positions in the buffer, and
3700 has to be called before the $-constructs are deleted."
3701 (let* ((fom-set-next-fom
3702 (lambda (fom nextfom)
3703 (cond ((yas--field-p fom)
3704 (setf (yas--field-next fom) nextfom))
3705 ((yas--mirror-p fom)
3706 (setf (yas--mirror-next fom) nextfom))
3708 (setf (yas--exit-next fom) nextfom)))))
3711 (if (= (yas--fom-start fom2) (yas--fom-start fom1))
3712 (yas--mirror-p fom2)
3713 (>= (yas--fom-start fom2) (yas--fom-start fom1)))))
3714 (link-foms fom-set-next-fom))
3715 ;; make some yas--field, yas--mirror and yas--exit soup
3717 (when (yas--snippet-exit snippet)
3718 (push (yas--snippet-exit snippet) soup))
3719 (dolist (field (yas--snippet-fields snippet))
3721 (dolist (mirror (yas--field-mirrors field))
3722 (push mirror soup)))
3724 (sort soup compare-fom-begs))
3726 (reduce link-foms soup)))))
3728 (defun yas--calculate-mirrors-in-fields (snippet mirror)
3729 "Attempt to assign a parent field of SNIPPET to the mirror MIRROR.
3731 Use the tightest containing field if more than one field contains
3732 the mirror. Intended to be called *before* the dollar-regions are
3734 (let ((min (point-min))
3736 (dolist (field (yas--snippet-fields snippet))
3737 (when (and (<= (yas--field-start field) (yas--mirror-start mirror))
3738 (<= (yas--mirror-end mirror) (yas--field-end field))
3739 (< min (yas--field-start field))
3740 (< (yas--field-end field) max))
3741 (setq min (yas--field-start field)
3742 max (yas--field-end field))
3743 (setf (yas--mirror-parent-field mirror) field)))))
3745 (defun yas--advance-end-maybe (fom newend)
3746 "Maybe advance FOM's end to NEWEND if it needs it.
3750 * call `yas--advance-start-maybe' on FOM's next fom.
3752 * in case FOM is field call `yas--advance-end-maybe' on its parent
3755 Also, if FOM is an exit-marker, always call
3756 `yas--advance-start-maybe' on its next fom. This is because
3757 exit-marker have identical start and end markers."
3758 (cond ((and fom (< (yas--fom-end fom) newend))
3759 (set-marker (yas--fom-end fom) newend)
3760 (yas--advance-start-maybe (yas--fom-next fom) newend)
3761 (yas--advance-end-of-parents-maybe (yas--fom-parent-field fom) newend))
3763 (yas--advance-start-maybe (yas--fom-next fom) newend))))
3765 (defun yas--advance-start-maybe (fom newstart)
3766 "Maybe advance FOM's start to NEWSTART if it needs it.
3768 If it does, also call `yas--advance-end-maybe' on FOM."
3769 (when (and fom (< (yas--fom-start fom) newstart))
3770 (set-marker (yas--fom-start fom) newstart)
3771 (yas--advance-end-maybe fom newstart)))
3773 (defun yas--advance-end-of-parents-maybe (field newend)
3774 "Like `yas--advance-end-maybe' but for parent fields.
3776 Only works for fields and doesn't care about the start of the
3777 next FOM. Works its way up recursively for parents of parents."
3779 (< (yas--field-end field) newend))
3780 (set-marker (yas--field-end field) newend)
3781 (yas--advance-end-of-parents-maybe (yas--field-parent-field field) newend)))
3783 (defvar yas--dollar-regions nil
3784 "When expanding the snippet the \"parse-create\" functions add
3785 cons cells to this var.")
3787 (defvar yas--backquote-markers-and-strings nil
3788 "List of (MARKER . STRING) marking where the values from
3789 backquoted Lisp expressions should be inserted at the end of
3792 (defun yas--snippet-parse-create (snippet)
3793 "Parse a recently inserted snippet template, creating all
3794 necessary fields, mirrors and exit points.
3796 Meant to be called in a narrowed buffer, does various passes"
3797 (let ((parse-start (point)))
3798 ;; Reset the yas--dollar-regions
3800 (setq yas--dollar-regions nil)
3801 ;; protect just the backquotes
3803 (yas--protect-escapes nil '(?`))
3804 ;; replace all backquoted expressions
3806 (goto-char parse-start)
3807 (yas--save-backquotes)
3808 ;; protect escaped characters
3810 (yas--protect-escapes)
3811 ;; parse fields with {}
3813 (goto-char parse-start)
3814 (yas--field-parse-create snippet)
3815 ;; parse simple mirrors and fields
3817 (goto-char parse-start)
3818 (yas--simple-mirror-parse-create snippet)
3819 ;; parse mirror transforms
3821 (goto-char parse-start)
3822 (yas--transform-mirror-parse-create snippet)
3823 ;; calculate adjacencies of fields and mirrors
3825 (yas--calculate-adjacencies snippet)
3826 ;; Delete $-constructs
3828 (save-restriction (widen) (yas--delete-regions yas--dollar-regions))
3829 ;; restore backquoted expression values
3831 (yas--restore-backquotes)
3834 (goto-char parse-start)
3835 (yas--restore-escapes)
3836 ;; update mirrors for the first time
3838 (yas--update-mirrors snippet)
3839 ;; indent the best we can
3841 (goto-char parse-start)
3842 (yas--indent snippet)))
3844 (defun yas--indent-according-to-mode (snippet-markers)
3845 "Indent current line according to mode, preserving SNIPPET-MARKERS."
3846 ;;; Apropos indenting problems....
3848 ;; `indent-according-to-mode' uses whatever `indent-line-function'
3849 ;; is available. Some implementations of these functions delete text
3850 ;; before they insert. If there happens to be a marker just after
3851 ;; the text being deleted, the insertion actually happens after the
3852 ;; marker, which misplaces it.
3854 ;; This would also happen if we had used overlays with the
3855 ;; `front-advance' property set to nil.
3857 ;; This is why I have these `trouble-markers', they are the ones at
3858 ;; they are the ones at the first non-whitespace char at the line
3859 ;; (i.e. at `yas--real-line-beginning'. After indentation takes place
3860 ;; we should be at the correct to restore them to. All other
3861 ;; non-trouble-markers have been *pushed* and don't need special
3864 (goto-char (yas--real-line-beginning))
3865 (let ((trouble-markers (remove-if-not #'(lambda (marker)
3871 (indent-according-to-mode)
3872 (error (yas--message 3 "Warning: `yas--indent-according-to-mode' having problems running %s" indent-line-function)
3874 (mapc #'(lambda (marker)
3875 (set-marker marker (point)))
3878 (defvar yas--indent-original-column nil)
3879 (defun yas--indent (snippet)
3880 (let ((snippet-markers (yas--collect-snippet-markers snippet)))
3881 ;; Look for those $>
3883 (while (re-search-forward "$>" nil t)
3884 (delete-region (match-beginning 0) (match-end 0))
3885 (when (not (eq yas-indent-line 'auto))
3886 (yas--indent-according-to-mode snippet-markers))))
3887 ;; Now do stuff for 'fixed and 'auto
3889 (cond ((eq yas-indent-line 'fixed)
3890 (while (and (zerop (forward-line))
3891 (zerop (current-column)))
3892 (indent-to-column yas--indent-original-column)))
3893 ((eq yas-indent-line 'auto)
3894 (let ((end (set-marker (make-marker) (point-max)))
3895 (indent-first-line-p yas-also-auto-indent-first-line))
3896 (while (and (zerop (if indent-first-line-p
3899 (setq indent-first-line-p nil))
3903 (yas--indent-according-to-mode snippet-markers))))
3907 (defun yas--collect-snippet-markers (snippet)
3908 "Make a list of all the markers used by SNIPPET."
3910 (dolist (field (yas--snippet-fields snippet))
3911 (push (yas--field-start field) markers)
3912 (push (yas--field-end field) markers)
3913 (dolist (mirror (yas--field-mirrors field))
3914 (push (yas--mirror-start mirror) markers)
3915 (push (yas--mirror-end mirror) markers)))
3916 (let ((snippet-exit (yas--snippet-exit snippet)))
3917 (when (and snippet-exit
3918 (marker-buffer (yas--exit-marker snippet-exit)))
3919 (push (yas--exit-marker snippet-exit) markers)))
3922 (defun yas--real-line-beginning ()
3923 (let ((c (char-after (line-beginning-position)))
3924 (n (line-beginning-position)))
3925 (while (or (eql c ?\ )
3928 (setq c (char-after n)))
3931 (defun yas--escape-string (escaped)
3932 (concat "YASESCAPE" (format "%d" escaped) "PROTECTGUARD"))
3934 (defun yas--protect-escapes (&optional text escaped)
3935 "Protect all escaped characters with their numeric ASCII value.
3937 With optional string TEXT do it in string instead of buffer."
3938 (let ((changed-text text)
3939 (text-provided-p text))
3940 (mapc #'(lambda (escaped)
3942 (yas--replace-all (concat "\\" (char-to-string escaped))
3943 (yas--escape-string escaped)
3944 (when text-provided-p changed-text))))
3945 (or escaped yas--escaped-characters))
3948 (defun yas--restore-escapes (&optional text escaped)
3949 "Restore all escaped characters from their numeric ASCII value.
3951 With optional string TEXT do it in string instead of the buffer."
3952 (let ((changed-text text)
3953 (text-provided-p text))
3954 (mapc #'(lambda (escaped)
3956 (yas--replace-all (yas--escape-string escaped)
3957 (char-to-string escaped)
3958 (when text-provided-p changed-text))))
3959 (or escaped yas--escaped-characters))
3962 (defun yas--save-backquotes ()
3963 "Save all the \"`(lisp-expression)`\"-style expressions
3964 with their evaluated value into `yas--backquote-markers-and-strings'."
3965 (while (re-search-forward yas--backquote-lisp-expression-regexp nil t)
3966 (let ((current-string (match-string-no-properties 1)) transformed)
3967 (save-restriction (widen)
3968 (delete-region (match-beginning 0) (match-end 0)))
3969 (setq transformed (yas--eval-lisp (yas--read-lisp (yas--restore-escapes current-string '(?`)))))
3970 (goto-char (match-beginning 0))
3972 (let ((marker (make-marker)))
3975 (insert "Y") ;; quite horrendous, I love it :)
3976 (set-marker marker (point))
3978 (push (cons marker transformed) yas--backquote-markers-and-strings))))))
3980 (defun yas--restore-backquotes ()
3981 "Replace markers in `yas--backquote-markers-and-strings' with their values."
3982 (while yas--backquote-markers-and-strings
3983 (let* ((marker-and-string (pop yas--backquote-markers-and-strings))
3984 (marker (car marker-and-string))
3985 (string (cdr marker-and-string)))
3993 (set-marker marker nil)))))
3995 (defun yas--scan-sexps (from count)
3997 (with-syntax-table (standard-syntax-table)
3998 (scan-sexps from count))
4002 (defun yas--make-marker (pos)
4003 "Create a marker at POS with nil `marker-insertion-type'."
4004 (let ((marker (set-marker (make-marker) pos)))
4005 (set-marker-insertion-type marker nil)
4008 (defun yas--field-parse-create (snippet &optional parent-field)
4009 "Parse most field expressions in SNIPPET, except for the simple one \"$n\".
4011 The following count as a field:
4013 * \"${n: text}\", for a numbered field with default text, as long as N is not 0;
4015 * \"${n: text$(expression)}, the same with a Lisp expression;
4016 this is caught with the curiously named `yas--multi-dollar-lisp-expression-regexp'
4018 * the same as above but unnumbered, (no N:) and number is calculated automatically.
4020 When multiple expressions are found, only the last one counts."
4023 (while (re-search-forward yas--field-regexp nil t)
4024 (let* ((real-match-end-0 (yas--scan-sexps (1+ (match-beginning 0)) 1))
4025 (number (and (match-string-no-properties 1)
4026 (string-to-number (match-string-no-properties 1))))
4027 (brand-new-field (and real-match-end-0
4028 ;; break if on "$(" immediately
4029 ;; after the ":", this will be
4030 ;; caught as a mirror with
4032 (not (save-match-data
4033 (eq (string-match "$[ \t\n]*("
4034 (match-string-no-properties 2)) 0)))
4035 ;; allow ${0: some exit text}
4036 ;; (not (and number (zerop number)))
4037 (yas--make-field number
4038 (yas--make-marker (match-beginning 2))
4039 (yas--make-marker (1- real-match-end-0))
4041 (when brand-new-field
4042 (goto-char real-match-end-0)
4043 (push (cons (1- real-match-end-0) real-match-end-0)
4044 yas--dollar-regions)
4045 (push (cons (match-beginning 0) (match-beginning 2))
4046 yas--dollar-regions)
4047 (push brand-new-field (yas--snippet-fields snippet))
4050 (narrow-to-region (yas--field-start brand-new-field) (yas--field-end brand-new-field))
4051 (goto-char (point-min))
4052 (yas--field-parse-create snippet brand-new-field)))))))
4053 ;; if we entered from a parent field, now search for the
4054 ;; `yas--multi-dollar-lisp-expression-regexp'. This is used for
4055 ;; primary field transformations
4059 (while (re-search-forward yas--multi-dollar-lisp-expression-regexp nil t)
4060 (let* ((real-match-end-1 (yas--scan-sexps (match-beginning 1) 1)))
4061 ;; commit the primary field transformation if:
4063 ;; 1. we don't find it in yas--dollar-regions (a subnested
4064 ;; field) might have already caught it.
4066 ;; 2. we really make sure we have either two '$' or some
4067 ;; text and a '$' after the colon ':'. This is a FIXME: work
4068 ;; my regular expressions and end these ugly hacks.
4070 (when (and real-match-end-1
4071 (not (member (cons (match-beginning 0)
4073 yas--dollar-regions))
4075 (char-before (1- (match-beginning 1))))))
4076 (let ((lisp-expression-string (buffer-substring-no-properties (match-beginning 1)
4078 (setf (yas--field-transform parent-field)
4079 (yas--read-lisp (yas--restore-escapes lisp-expression-string))))
4080 (push (cons (match-beginning 0) real-match-end-1)
4081 yas--dollar-regions)))))))
4083 (defun yas--transform-mirror-parse-create (snippet)
4084 "Parse the \"${n:$(lisp-expression)}\" mirror transformations in SNIPPET."
4085 (while (re-search-forward yas--transform-mirror-regexp nil t)
4086 (let* ((real-match-end-0 (yas--scan-sexps (1+ (match-beginning 0)) 1))
4087 (number (string-to-number (match-string-no-properties 1)))
4089 (not (zerop number))
4090 (yas--snippet-find-field snippet number)))
4092 (and real-match-end-0
4094 (yas--make-mirror (yas--make-marker (match-beginning 0))
4095 (yas--make-marker (match-beginning 0))
4097 (yas--restore-escapes
4098 (buffer-substring-no-properties (match-beginning 2)
4099 (1- real-match-end-0))))))))
4100 (when brand-new-mirror
4101 (push brand-new-mirror
4102 (yas--field-mirrors field))
4103 (yas--calculate-mirrors-in-fields snippet brand-new-mirror)
4104 (push (cons (match-beginning 0) real-match-end-0) yas--dollar-regions)))))
4106 (defun yas--simple-mirror-parse-create (snippet)
4107 "Parse the simple \"$n\" fields/mirrors/exitmarkers in SNIPPET."
4108 (while (re-search-forward yas--simple-mirror-regexp nil t)
4109 (let ((number (string-to-number (match-string-no-properties 1))))
4110 (cond ((zerop number)
4112 (setf (yas--snippet-exit snippet)
4113 (yas--make-exit (yas--make-marker (match-end 0))))
4115 (goto-char (match-beginning 0))
4116 (when yas-wrap-around-region
4117 (cond (yas-selected-text
4118 (insert yas-selected-text))
4119 ((and (eq yas-wrap-around-region 'cua)
4122 (insert (prog1 (get-register ?0)
4123 (set-register ?0 nil))))))
4124 (push (cons (point) (yas--exit-marker (yas--snippet-exit snippet)))
4125 yas--dollar-regions)))
4127 (let ((field (yas--snippet-find-field snippet number)))
4129 (let ((brand-new-mirror (yas--make-mirror
4130 (yas--make-marker (match-beginning 0))
4131 (yas--make-marker (match-beginning 0))
4133 (push brand-new-mirror
4134 (yas--field-mirrors field))
4135 (yas--calculate-mirrors-in-fields snippet brand-new-mirror))
4136 (push (yas--make-field number
4137 (yas--make-marker (match-beginning 0))
4138 (yas--make-marker (match-beginning 0))
4140 (yas--snippet-fields snippet))))
4141 (push (cons (match-beginning 0) (match-end 0))
4142 yas--dollar-regions))))))
4144 (defun yas--delete-regions (regions)
4145 "Sort disjuct REGIONS by start point, then delete from the back."
4146 (mapc #'(lambda (reg)
4147 (delete-region (car reg) (cdr reg)))
4150 (>= (car r1) (car r2))))))
4152 (defun yas--calculate-mirror-depth (mirror &optional traversed)
4153 (let* ((parent (yas--mirror-parent-field mirror))
4154 (parents-mirrors (and parent
4155 (yas--field-mirrors parent))))
4156 (or (yas--mirror-depth mirror)
4157 (setf (yas--mirror-depth mirror)
4158 (cond ((memq mirror traversed)
4160 ((and parent parents-mirrors)
4162 (mapcar #'(lambda (m)
4163 (yas--calculate-mirror-depth m
4172 (defun yas--update-mirrors (snippet)
4173 "Update all the mirrors of SNIPPET."
4175 (dolist (field-and-mirror (sort
4176 ;; make a list of ((F1 . M1) (F1 . M2) (F2 . M3) (F2 . M4) ...)
4177 ;; where F is the field that M is mirroring
4179 (mapcan #'(lambda (field)
4180 (mapcar #'(lambda (mirror)
4181 (cons field mirror))
4182 (yas--field-mirrors field)))
4183 (yas--snippet-fields snippet))
4184 ;; then sort this list so that entries with mirrors with parent
4185 ;; fields appear before. This was important for fixing #290, and
4186 ;; luckily also handles the case where a mirror in a field causes
4187 ;; another mirror to need reupdating
4189 #'(lambda (field-and-mirror1 field-and-mirror2)
4190 (> (yas--calculate-mirror-depth (cdr field-and-mirror1))
4191 (yas--calculate-mirror-depth (cdr field-and-mirror2))))))
4192 (let* ((field (car field-and-mirror))
4193 (mirror (cdr field-and-mirror))
4194 (parent-field (yas--mirror-parent-field mirror)))
4195 ;; before updating a mirror with a parent-field, maybe advance
4199 (yas--advance-start-maybe mirror (yas--fom-start parent-field)))
4200 ;; update this mirror
4202 (yas--mirror-update-display mirror field)
4203 ;; `yas--place-overlays' is needed if the active field and
4204 ;; protected overlays have been changed because of insertions
4205 ;; in `yas--mirror-update-display'
4207 (when (eq field (yas--snippet-active-field snippet))
4208 (yas--place-overlays snippet field))))))
4210 (defun yas--mirror-update-display (mirror field)
4211 "Update MIRROR according to FIELD (and mirror transform)."
4213 (let* ((mirror-parent-field (yas--mirror-parent-field mirror))
4214 (reflection (and (not (and mirror-parent-field
4215 (yas--field-modified-p mirror-parent-field)))
4216 (or (yas--apply-transform mirror field 'empty-on-nil)
4217 (yas--field-text-for-display field)))))
4218 (when (and reflection
4219 (not (string= reflection (buffer-substring-no-properties (yas--mirror-start mirror)
4220 (yas--mirror-end mirror)))))
4221 (goto-char (yas--mirror-start mirror))
4222 (yas--inhibit-overlay-hooks
4223 (insert reflection))
4224 (if (> (yas--mirror-end mirror) (point))
4225 (delete-region (point) (yas--mirror-end mirror))
4226 (set-marker (yas--mirror-end mirror) (point))
4227 (yas--advance-start-maybe (yas--mirror-next mirror) (point))
4228 ;; super-special advance
4229 (yas--advance-end-of-parents-maybe mirror-parent-field (point))))))
4231 (defun yas--field-update-display (field)
4232 "Much like `yas--mirror-update-display', but for fields."
4233 (when (yas--field-transform field)
4234 (let ((transformed (and (not (eq (yas--field-number field) 0))
4235 (yas--apply-transform field field))))
4236 (when (and transformed
4237 (not (string= transformed (buffer-substring-no-properties (yas--field-start field)
4238 (yas--field-end field)))))
4239 (setf (yas--field-modified-p field) t)
4240 (goto-char (yas--field-start field))
4241 (yas--inhibit-overlay-hooks
4242 (insert transformed)
4243 (if (> (yas--field-end field) (point))
4244 (delete-region (point) (yas--field-end field))
4245 (set-marker (yas--field-end field) (point))
4246 (yas--advance-start-maybe (yas--field-next field) (point)))
4250 ;;; Post-command hook:
4252 (defun yas--post-command-handler ()
4253 "Handles various yasnippet conditions after each command."
4254 (cond ((eq 'undo this-command)
4256 ;; After undo revival the correct field is sometimes not
4257 ;; restored correctly, this condition handles that
4259 (let* ((snippet (car (yas--snippets-at-point)))
4260 (target-field (and snippet
4261 (find-if-not #'(lambda (field)
4262 (yas--field-probably-deleted-p snippet field))
4264 (cons (yas--snippet-active-field snippet)
4265 (yas--snippet-fields snippet)))))))
4267 (yas--move-to-field snippet target-field))))
4268 ((not (yas--undo-in-progress))
4269 ;; When not in an undo, check if we must commit the snippet
4270 ;; (user exited it).
4271 (yas--check-commit-snippet))))
4275 ;; The docstrings for some functions are generated dynamically
4276 ;; depending on the context.
4278 (put 'yas-expand 'function-documentation
4279 '(yas--expand-from-trigger-key-doc t))
4280 (defun yas--expand-from-trigger-key-doc (context)
4281 "A doc synthesizer for `yas--expand-from-trigger-key-doc'."
4282 (let* ((yas-fallback-behavior (and context yas-fallback-behavior))
4283 (fallback-description
4284 (cond ((eq yas-fallback-behavior 'call-other-command)
4285 (let* ((fallback (yas--keybinding-beyond-yasnippet)))
4287 (format "call command `%s'."
4288 (pp-to-string fallback)))
4289 "do nothing (`yas-expand' doesn't override\nanything).")))
4290 ((eq yas-fallback-behavior 'return-nil)
4292 (t "defer to `yas-fallback-behavior' (which see)."))))
4293 (concat "Expand a snippet before point. If no snippet
4294 expansion is possible, "
4295 fallback-description
4296 "\n\nOptional argument FIELD is for non-interactive use and is an
4297 object satisfying `yas--field-p' to restrict the expansion to.")))
4299 (put 'yas-expand-from-keymap 'function-documentation
4300 '(yas--expand-from-keymap-doc t))
4301 (defun yas--expand-from-keymap-doc (context)
4302 "A doc synthesizer for `yas--expand-from-keymap-doc'."
4303 (add-hook 'temp-buffer-show-hook 'yas--snippet-description-finish-runonce)
4304 (concat "Expand/run snippets from keymaps, possibly falling back to original binding.\n"
4305 (when (and context (eq this-command 'describe-key))
4306 (let* ((vec (this-single-command-keys))
4307 (templates (mapcan #'(lambda (table)
4308 (yas--fetch table vec))
4309 (yas--get-snippet-tables)))
4310 (yas--direct-keymaps nil)
4311 (fallback (key-binding vec)))
4312 (concat "In this case, "
4314 (concat "these snippets are bound to this key:\n"
4315 (yas--template-pretty-list templates)
4316 "\n\nIf none of these expands, "))
4318 (format "fallback `%s' will be called." (pp-to-string fallback)))
4319 "no fallback keybinding is called."))))))
4321 (defun yas--template-pretty-list (templates)
4323 (yas-buffer-local-condition 'always))
4324 (dolist (plate templates)
4325 (setq acc (concat acc "\n*) "
4326 (propertize (concat "\\\\snippet `" (car plate) "'")
4327 'yasnippet (cdr plate)))))
4330 (define-button-type 'help-snippet-def
4331 :supertype 'help-xref
4332 'help-function (lambda (template) (yas--visit-snippet-file-1 template))
4333 'help-echo (purecopy "mouse-2, RET: find snippets's definition"))
4335 (defun yas--snippet-description-finish-runonce ()
4336 "Final adjustments for the help buffer when snippets are concerned."
4337 (yas--create-snippet-xrefs)
4338 (remove-hook 'temp-buffer-show-hook 'yas--snippet-description-finish-runonce))
4340 (defun yas--create-snippet-xrefs ()
4342 (goto-char (point-min))
4343 (while (search-forward-regexp "\\\\\\\\snippet[ \s\t]+`\\([^']+\\)'" nil t)
4344 (let ((template (get-text-property (match-beginning 1)
4347 (help-xref-button 1 'help-snippet-def template)
4348 (kill-region (match-end 1) (match-end 0))
4349 (kill-region (match-beginning 0) (match-beginning 1)))))))
4353 (defvar yas-verbosity 4
4354 "Log level for `yas--message' 4 means trace most anything, 0 means nothing.")
4356 (defun yas--message (level message &rest args)
4357 "When LEVEL is above `yas-verbosity-level', log MESSAGE and ARGS."
4358 (when (> yas-verbosity level)
4359 (message "%s" (apply #'yas--format message args))))
4361 (defun yas--warning (format-control &rest format-args)
4362 (let ((msg (apply #'format format-control format-args)))
4363 (display-warning 'yasnippet msg :warning)
4364 (yas--message 1 msg)))
4366 (defun yas--format (format-control &rest format-args)
4367 (apply #'format (concat "[yas] " format-control) format-args))
4374 ;; `locate-dominating-file'
4375 ;; `region-active-p'
4377 ;; added for compatibility in emacsen < 23
4378 (unless (>= emacs-major-version 23)
4379 (unless (fboundp 'region-active-p)
4380 (defun region-active-p () (and transient-mark-mode mark-active)))
4382 (unless (fboundp 'locate-dominating-file)
4383 (defvar locate-dominating-stop-dir-regexp
4384 "\\`\\(?:[\\/][\\/][^\\/]+[\\/]\\|/\\(?:net\\|afs\\|\\.\\.\\.\\)/\\)\\'"
4385 "Regexp of directory names which stop the search in `locate-dominating-file'.
4386 Any directory whose name matches this regexp will be treated like
4387 a kind of root directory by `locate-dominating-file' which will stop its search
4388 when it bumps into it.
4389 The default regexp prevents fruitless and time-consuming attempts to find
4390 special files in directories in which filenames are interpreted as hostnames,
4391 or mount points potentially requiring authentication as a different user.")
4393 (defun locate-dominating-file (file name)
4394 "Look up the directory hierarchy from FILE for a file named NAME.
4395 Stop at the first parent directory containing a file NAME,
4396 and return the directory. Return nil if not found."
4397 ;; We used to use the above locate-dominating-files code, but the
4398 ;; directory-files call is very costly, so we're much better off doing
4399 ;; multiple calls using the code in here.
4401 ;; Represent /home/luser/foo as ~/foo so that we don't try to look for
4402 ;; `name' in /home or in /.
4403 (setq file (abbreviate-file-name file))
4406 (while (not (or root
4408 ;; FIXME: Disabled this heuristic because it is sometimes
4410 ;; As a heuristic, we stop looking up the hierarchy of
4411 ;; directories as soon as we find a directory belonging
4412 ;; to another user. This should save us from looking in
4413 ;; things like /net and /afs. This assumes that all the
4414 ;; files inside a project belong to the same user.
4415 ;; (let ((prev-user user))
4416 ;; (setq user (nth 2 (file-attributes file)))
4417 ;; (and prev-user (not (equal user prev-user))))
4418 (string-match locate-dominating-stop-dir-regexp file)))
4419 (setq try (file-exists-p (expand-file-name name file)))
4420 (cond (try (setq root file))
4421 ((equal file (setq file (file-name-directory
4422 (directory-file-name file))))
4427 ;;; Backward compatibility to yasnippet <= 0.7
4429 (defun yas-initialize ()
4430 "For backward compatibility, enable `yas-minor-mode' globally."
4431 (declare (obsolete "Use (yas-global-mode 1) instead." "0.8"))
4432 (yas-global-mode 1))
4434 (defvar yas--backported-syms '(;; `defcustom's
4437 yas-prompt-functions
4439 yas-also-auto-indent-first-line
4441 yas-triggers-in-field
4442 yas-fallback-behavior
4443 yas-choose-keys-first
4444 yas-choose-tables-first
4447 yas-wrap-around-region
4450 yas-expand-only-for-last-commands
4451 yas-field-highlight-face
4453 ;; these vars can be customized as well
4459 yas-after-exit-snippet-hook
4460 yas-before-expand-snippet-hook
4461 yas-buffer-local-condition
4464 ;; prompting functions
4469 yas-completing-prompt
4472 ;; interactive functions
4477 yas-direct-keymaps-reload
4481 yas-compile-directory
4484 yas-expand-from-trigger-key
4485 yas-expand-from-keymap
4487 yas-visit-snippet-file
4489 yas-load-snippet-buffer
4492 yas-next-field-or-maybe-expand
4497 yas-exit-all-snippets
4498 yas-skip-and-clear-or-delete-char
4501 ;; symbols that I "exported" for use
4502 ;; in snippets and hookage
4519 yas-default-from-field
4522 yas-define-condition-cache
4523 yas-hippie-try-expand
4525 ;; debug definitions
4526 ;; yas-debug-snippet-vars
4527 ;; yas-exterminate-package
4530 ;; testing definitions
4531 ;; yas-should-expand
4532 ;; yas-should-not-expand
4534 ;; yas-make-file-or-dirs
4536 ;; yas-saving-variables
4537 ;; yas-call-with-snippet-dirs
4538 ;; yas-with-snippet-dirs
4540 "Backported yasnippet symbols.
4542 They are mapped to \"yas/*\" variants.")
4544 (dolist (sym yas--backported-syms)
4545 (let ((backported (intern (replace-regexp-in-string "^yas-" "yas/" (symbol-name sym)))))
4547 (make-obsolete-variable backported sym "yasnippet 0.8")
4548 (defvaralias backported sym))
4550 (make-obsolete backported sym "yasnippet 0.8")
4551 (defalias backported sym))))
4553 (defvar yas--exported-syms
4555 (mapatoms (lambda (atom)
4556 (if (and (or (and (boundp atom)
4557 (not (get atom 'byte-obsolete-variable)))
4559 (not (get atom 'byte-obsolete-info))))
4560 (string-match-p "^yas-[^-]" (symbol-name atom)))
4561 (push atom exported))))
4563 "Exported yasnippet symbols.
4565 i.e. the ones with \"yas-\" single dash prefix. I will try to
4566 keep them in future yasnippet versions and other elisp libraries
4567 can more or less safely rely upon them.")
4570 (provide 'yasnippet)
4573 ;; indent-tabs-mode: nil
4574 ;; byte-compile-warnings: (not cl-functions)
4576 ;;; yasnippet.el ends here