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+;;; Yasnippet.el --- Yet another snippet extension for Emacs.
+
+;; Copyright 2008 pluskid
+;; 2009 pluskid, joaotavora
+
+;; Authors: pluskid <pluskid@gmail.com>, joaotavora <joaotavora@gmail.com>
+;; Version: 0.6.1
+;; Package-version: 0.6.1c
+;; X-URL: http://code.google.com/p/yasnippet/
+;; Keywords: convenience, emulation
+;; URL: http://code.google.com/p/yasnippet/
+;; EmacsWiki: YaSnippetMode
+
+;; This file is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; This file is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING. If not, write to
+;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; Basic steps to setup:
+;;
+;; 1. In your .emacs file:
+;; (add-to-list 'load-path "/dir/to/yasnippet.el")
+;; (require 'yasnippet)
+;; 2. Place the `snippets' directory somewhere. E.g: ~/.emacs.d/snippets
+;; 3. In your .emacs file
+;; (setq yas/root-directory "~/.emacs/snippets")
+;; (yas/load-directory yas/root-directory)
+;; 4. To enable the YASnippet menu and tab-trigger expansion
+;; M-x yas/minor-mode
+;; 5. To globally enable the minor mode in *all* buffers
+;; M-x yas/global-mode
+;;
+;; Steps 4. and 5. are optional, you don't have to use the minor
+;; mode to use YASnippet.
+;;
+;; Interesting variables are:
+;;
+;; `yas/root-directory'
+;;
+;; The directory where user-created snippets are to be
+;; stored. Can also be a list of directories that
+;; `yas/reload-all' will use for bulk-reloading snippets. In
+;; that case the first directory the default for storing new
+;; snippets.
+;;
+;; `yas/mode-symbol'
+;;
+;; A local variable that you can set in a hook to override
+;; snippet-lookup based on major mode. It is a a symbol (or
+;; list of symbols) that correspond to subdirectories of
+;; `yas/root-directory' and is used for deciding which
+;; snippets to consider for the active buffer.
+;;
+;; Major commands are:
+;;
+;; M-x yas/expand
+;;
+;; Try to expand snippets before point. In `yas/minor-mode',
+;; this is bound to `yas/trigger-key' which you can customize.
+;;
+;; M-x yas/load-directory
+;;
+;; Prompts you for a directory hierarchy of snippets to load.
+;;
+;; M-x yas/insert-snippet
+;;
+;; Prompts you for possible snippet expansion if that is
+;; possible according to buffer-local and snippet-local
+;; expansion conditions. With prefix argument, ignore these
+;; conditions.
+;;
+;; M-x yas/find-snippets
+;;
+;; Lets you find the snippet files in the correct
+;; subdirectory of `yas/root-directory', according to the
+;; active major mode (if it exists) like
+;; `find-file-other-window'.
+;;
+;; M-x yas/visit-snippet-file
+;;
+;; Prompts you for possible snippet expansions like
+;; `yas/insert-snippet', but instead of expanding it, takes
+;; you directly to the snippet definition's file, if it
+;; exists.
+;;
+;; M-x yas/new-snippet
+;;
+;; Lets you create a new snippet file in the correct
+;; subdirectory of `yas/root-directory', according to the
+;; active major mode.
+;;
+;; M-x yas/load-snippet-buffer
+;;
+;; When editing a snippet, this loads the snippet. This is
+;; bound to "C-c C-c" while in the `snippet-mode' editing
+;; mode.
+;;
+;; M-x yas/tryout-snippet
+;;
+;; When editing a snippet, this opens a new empty buffer,
+;; sets it to the appropriate major mode and inserts the
+;; snippet there, so you can see what it looks like. This is
+;; bound to "C-c C-t" while in `snippet-mode'.
+;;
+;; The `dropdown-list.el' extension is bundled with YASnippet, you
+;; can optionally use it the preferred "prompting method", puting in
+;; your .emacs file, for example:
+;;
+;; (require 'dropdown-list)
+;; (setq yas/prompt-functions '(yas/dropdown-prompt
+;; yas/ido-prompt
+;; yas/completing-prompt))
+;;
+;; Also check out the customization group
+;;
+;; M-x customize-group RET yasnippet RET
+;;
+;; If you use the customization group to set variables
+;; `yas/root-directory' or `yas/global-mode', make sure the path to
+;; "yasnippet.el" is present in the `load-path' *before* the
+;; `custom-set-variables' is executed in your .emacs file.
+;;
+;; For more information and detailed usage, refer to the project page:
+;; http://code.google.com/p/yasnippet/
+
+;;; Code:
+
+(require 'cl)
+(require 'assoc)
+(require 'easymenu)
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; User customizable variables
+
+
+(defgroup yasnippet nil
+ "Yet Another Snippet extension"
+ :group 'editing)
+
+;;;###autoload
+(defcustom yas/root-directory nil
+ "Root directory that stores the snippets for each major mode.
+
+If you set this from your .emacs, can also be a list of strings,
+for multiple root directories. If you make this a list, the first
+element is always the user-created snippets directory. Other
+directories are used for bulk reloading of all snippets using
+`yas/reload-all'"
+ :type '(choice (string :tag "Single directory (string)")
+ (repeat :args (string) :tag "List of directories (strings)"))
+ :group 'yasnippet
+ :require 'yasnippet
+ :set #'(lambda (symbol new)
+ (let ((old (and (boundp symbol)
+ (symbol-value symbol))))
+ (set-default symbol new)
+ (unless (or (not (fboundp 'yas/reload-all))
+ (equal old new))
+ (yas/reload-all)))))
+
+(defcustom yas/prompt-functions '(yas/x-prompt
+ yas/dropdown-prompt
+ yas/completing-prompt
+ yas/ido-prompt
+ yas/no-prompt)
+ "Functions to prompt for keys, templates, etc interactively.
+
+These functions are called with the following arguments:
+
+- PROMPT: A string to prompt the user
+
+- CHOICES: a list of strings or objects.
+
+- optional DISPLAY-FN : A function that, when applied to each of
+the objects in CHOICES will return a string.
+
+The return value of any function you put here should be one of
+the objects in CHOICES, properly formatted with DISPLAY-FN (if
+that is passed).
+
+- To signal that your particular style of prompting is
+unavailable at the moment, you can also have the function return
+nil.
+
+- To signal that the user quit the prompting process, you can
+signal `quit' with
+
+ (signal 'quit \"user quit!\")."
+ :type '(repeat function)
+ :group 'yasnippet)
+
+(defcustom yas/indent-line 'auto
+ "Controls indenting applied to a recent snippet expansion.
+
+The following values are possible:
+
+- `fixed' Indent the snippet to the current column;
+
+- `auto' Indent each line of the snippet with `indent-according-to-mode'
+
+Every other value means don't apply any snippet-side indendation
+after expansion (the manual per-line \"$>\" indentation still
+applies)."
+ :type '(choice (const :tag "Nothing" nothing)
+ (const :tag "Fixed" fixed)
+ (const :tag "Auto" auto))
+ :group 'yasnippet)
+
+(defcustom yas/also-auto-indent-first-line nil
+ "Non-nil means also auto indent first line according to mode.
+
+Naturally this is only valid when `yas/indent-line' is `auto'"
+ :type 'boolean
+ :group 'yasnippet)
+
+(defcustom yas/snippet-revival t
+ "Non-nil means re-activate snippet fields after undo/redo."
+ :type 'boolean
+ :group 'yasnippet)
+
+(defcustom yas/trigger-key "TAB"
+ "The key bound to `yas/expand' when function `yas/minor-mode' is active.
+
+Value is a string that is converted to the internal Emacs key
+representation using `read-kbd-macro'."
+ :type 'string
+ :group 'yasnippet
+ :set #'(lambda (symbol key)
+ (let ((old (and (boundp symbol)
+ (symbol-value symbol))))
+ (set-default symbol key)
+ ;; On very first loading of this defcustom,
+ ;; `yas/trigger-key' is *not* loaded.
+ (if (fboundp 'yas/trigger-key-reload)
+ (yas/trigger-key-reload old)))))
+
+(defcustom yas/next-field-key '("TAB" "<tab>")
+ "The key to navigate to next field when a snippet is active.
+
+Value is a string that is converted to the internal Emacs key
+representation using `read-kbd-macro'.
+
+Can also be a list of strings."
+ :type '(choice (string :tag "String")
+ (repeat :args (string) :tag "List of strings"))
+ :group 'yasnippet
+ :set #'(lambda (symbol val)
+ (set-default symbol val)
+ (if (fboundp 'yas/init-yas-in-snippet-keymap)
+ (yas/init-yas-in-snippet-keymap))))
+
+
+(defcustom yas/prev-field-key '("<backtab>" "<S-tab>")
+ "The key to navigate to previous field when a snippet is active.
+
+Value is a string that is converted to the internal Emacs key
+representation using `read-kbd-macro'.
+
+Can also be a list of strings."
+ :type '(choice (string :tag "String")
+ (repeat :args (string) :tag "List of strings"))
+ :group 'yasnippet
+ :set #'(lambda (symbol val)
+ (set-default symbol val)
+ (if (fboundp 'yas/init-yas-in-snippet-keymap)
+ (yas/init-yas-in-snippet-keymap))))
+
+(defcustom yas/skip-and-clear-key "C-d"
+ "The key to clear the currently active field.
+
+Value is a string that is converted to the internal Emacs key
+representation using `read-kbd-macro'.
+
+Can also be a list of strings."
+ :type '(choice (string :tag "String")
+ (repeat :args (string) :tag "List of strings"))
+ :group 'yasnippet
+ :set #'(lambda (symbol val)
+ (set-default symbol val)
+ (if (fboundp 'yas/init-yas-in-snippet-keymap)
+ (yas/init-yas-in-snippet-keymap))))
+
+(defcustom yas/triggers-in-field nil
+ "If non-nil, `yas/next-field-key' can trigger stacked expansions.
+
+Otherwise, `yas/next-field-key' just tries to move on to the next
+field"
+ :type 'boolean
+ :group 'yasnippet)
+
+(defcustom yas/fallback-behavior 'call-other-command
+ "How to act when `yas/trigger-key' does *not* expand a snippet.
+
+- `call-other-command' means try to temporarily disable YASnippet
+ and call the next command bound to `yas/trigger-key'.
+
+- nil or the symbol `return-nil' mean do nothing. (and
+ `yas/expand-returns' nil)
+
+- A lisp form (apply COMMAND . ARGS) means interactively call
+ COMMAND, if ARGS is non-nil, call COMMAND non-interactively
+ with ARGS as arguments."
+ :type '(choice (const :tag "Call previous command" call-other-command)
+ (const :tag "Do nothing" return-nil))
+ :group 'yasnippet)
+(make-variable-buffer-local 'yas/fallback-behavior)
+
+(defcustom yas/choose-keys-first nil
+ "If non-nil, prompt for snippet key first, then for template.
+
+Otherwise prompts for all possible snippet names.
+
+This affects `yas/insert-snippet' and `yas/visit-snippet-file'."
+ :type 'boolean
+ :group 'yasnippet)
+
+(defcustom yas/choose-tables-first nil
+ "If non-nil, and multiple eligible snippet tables, prompts user for tables first.
+
+Otherwise, user chooses between the merging together of all
+eligible tables.
+
+This affects `yas/insert-snippet', `yas/visit-snippet-file'"
+ :type 'boolean
+ :group 'yasnippet)
+
+(defcustom yas/use-menu 'real-modes
+ "Display a YASnippet menu in the menu bar.
+
+When non-nil, submenus for each snippet table will be listed
+under the menu \"Yasnippet\".
+
+- If set to `real-modes' only submenus whose name more or less
+corresponds to a major mode are listed.
+
+- If set to `abbreviate', only the current major-mode
+menu and the modes set in `yas/mode-symbol' are listed.
+
+Any other non-nil value, every submenu is listed."
+ :type '(choice (const :tag "Full" t)
+ (const :tag "Real modes only" real-modes)
+ (const :tag "Abbreviate" abbreviate))
+ :group 'yasnippet)
+
+(defcustom yas/trigger-symbol " =>"
+ "The text that will be used in menu to represent the trigger."
+ :type 'string
+ :group 'yasnippet)
+
+(defcustom yas/wrap-around-region nil
+ "If non-nil, snippet expansion wraps around selected region.
+
+The wrapping occurs just before the snippet's exit marker. This
+can be overriden on a per-snippet basis."
+ :type 'boolean
+ :group 'yasnippet)
+
+(defcustom yas/good-grace t
+ "If non-nil, don't raise errors in inline elisp evaluation.
+
+An error string \"[yas] error\" is returned instead."
+ :type 'boolean
+ :group 'yasnippet)
+
+(defcustom yas/ignore-filenames-as-triggers nil
+ "If non-nil, don't derive tab triggers from filenames.
+
+This means a snippet without a \"# key:'\ directive wont have a
+tab trigger."
+ :type 'boolean
+ :group 'yasnippet)
+
+(defcustom yas/visit-from-menu nil
+ "If non-nil visit snippets's files from menu, instead of expanding them.
+
+This cafn only work when snippets are loaded from files."
+ :type 'boolean
+ :group 'yasnippet)
+
+(defface yas/field-highlight-face
+ '((((class color) (background light)) (:background "DarkSeaGreen1"))
+ (t (:background "DimGrey")))
+ "The face used to highlight the currently active field of a snippet"
+ :group 'yasnippet)
+
+(defface yas/field-debug-face
+ '()
+ "The face used for debugging some overlays normally hidden"
+ :group 'yasnippet)
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; User can also customize the next defvars
+(defun yas/define-some-keys (keys keymap definition)
+ "Bind KEYS to DEFINITION in KEYMAP, read with `read-kbd-macro'."
+ (let ((keys (or (and (listp keys) keys)
+ (list keys))))
+ (dolist (key keys)
+ (define-key keymap (read-kbd-macro key) definition))))
+
+(defvar yas/keymap
+ (let ((map (make-sparse-keymap)))
+ (mapc #'(lambda (binding)
+ (yas/define-some-keys (car binding) map (cdr binding)))
+ `((,yas/next-field-key . yas/next-field-or-maybe-expand)
+ (,yas/prev-field-key . yas/prev-field)
+ ("C-g" . yas/abort-snippet)
+ (,yas/skip-and-clear-key . yas/skip-and-clear-or-delete-char)))
+ map)
+ "The keymap active while a snippet expansion is in progress.")
+
+(defvar yas/key-syntaxes (list "w" "w_" "w_." "^ ")
+ "A list of syntax of a key. This list is tried in the order
+to try to find a key. For example, if the list is '(\"w\" \"w_\").
+And in emacs-lisp-mode, where \"-\" has the syntax of \"_\":
+
+foo-bar
+
+will first try \"bar\", if not found, then \"foo-bar\" is tried.")
+
+(defvar yas/after-exit-snippet-hook
+ '()
+ "Hooks to run after a snippet exited.
+
+The hooks will be run in an environment where some variables bound to
+proper values:
+
+`yas/snippet-beg' : The beginning of the region of the snippet.
+
+`yas/snippet-end' : Similar to beg.
+
+Attention: These hooks are not run when exiting nested/stackd snippet expansion!")
+
+(defvar yas/before-expand-snippet-hook
+ '()
+ "Hooks to run just before expanding a snippet.")
+
+(defvar yas/buffer-local-condition
+ '(if (and (not (bobp))
+ (or (equal 'font-lock-comment-face
+ (get-char-property (1- (point))
+ 'face))
+ (equal 'font-lock-string-face
+ (get-char-property (1- (point))
+ 'face))))
+ '(require-snippet-condition . force-in-comment)
+ t)
+ "Snippet expanding condition.
+
+This variable is a lisp form:
+
+ * If it evaluates to nil, no snippets can be expanded.
+
+ * If it evaluates to the a cons (require-snippet-condition
+ . REQUIREMENT)
+
+ * Snippets bearing no \"# condition:\" directive are not
+ considered
+
+ * Snippets bearing conditions that evaluate to nil (or
+ produce an error) won't be onsidered.
+
+ * If the snippet has a condition that evaluates to non-nil
+ RESULT:
+
+ * If REQUIREMENT is t, the snippet is considered
+
+ * If REQUIREMENT is `eq' RESULT, the snippet is
+ considered
+
+ * Otherwise, the snippet is not considered.
+
+ * If it evaluates to the symbol 'always, all snippets are
+ considered for expansion, regardless of any conditions.
+
+ * If it evaluates to t or some other non-nil value
+
+ * Snippet bearing no conditions, or conditions that
+ evaluate to non-nil, are considered for expansion.
+
+ * Otherwise, the snippet is not considered.
+
+Here's an example preventing snippets from being expanded from
+inside comments, in `python-mode' only, with the exception of
+snippets returning the symbol 'force-in-comment in their
+conditions.
+
+ (add-hook 'python-mode-hook
+ '(lambda ()
+ (setq yas/buffer-local-condition
+ '(if (python-in-string/comment)
+ '(require-snippet-condition . force-in-comment)
+ t))))
+
+The default value is similar, it filters out potential snippet
+expansions inside comments and string literals, unless the
+snippet itself contains a condition that returns the symbol
+`force-in-comment'.")
+(make-variable-buffer-local 'yas/buffer-local-condition)
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Internal variables
+
+(defvar yas/version "0.6.1b")
+
+(defvar yas/menu-table (make-hash-table)
+ "A hash table of MAJOR-MODE symbols to menu keymaps.")
+
+(defvar yas/active-keybindings nil
+ "A list of cons (KEYMAP . KEY) setup from defining snippets.")
+
+(defvar yas/known-modes
+ '(ruby-mode rst-mode markdown-mode)
+ "A list of mode which is well known but not part of emacs.")
+
+(defvar yas/escaped-characters
+ '(?\\ ?` ?' ?$ ?} )
+ "List of characters which *might* need to be escaped.")
+
+(defconst yas/field-regexp
+ "${\\([0-9]+:\\)?\\([^}]*\\)}"
+ "A regexp to *almost* recognize a field.")
+
+(defconst yas/multi-dollar-lisp-expression-regexp
+ "$+[ \t\n]*\\(([^)]*)\\)"
+ "A regexp to *almost* recognize a \"$(...)\" expression.")
+
+(defconst yas/backquote-lisp-expression-regexp
+ "`\\([^`]*\\)`"
+ "A regexp to recognize a \"`lisp-expression`\" expression." )
+
+(defconst yas/transform-mirror-regexp
+ "${\\(?:\\([0-9]+\\):\\)?$\\([ \t\n]*([^}]*\\)"
+ "A regexp to *almost* recognize a mirror with a transform.")
+
+(defconst yas/simple-mirror-regexp
+ "$\\([0-9]+\\)"
+ "A regexp to recognize a simple mirror.")
+
+(defvar yas/snippet-id-seed 0
+ "Contains the next id for a snippet.")
+
+(defun yas/snippet-next-id ()
+ (let ((id yas/snippet-id-seed))
+ (incf yas/snippet-id-seed)
+ id))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Minor mode stuff
+
+;; XXX: `last-buffer-undo-list' is somehow needed in Carbon Emacs for MacOSX
+(defvar last-buffer-undo-list nil)
+
+(defvar yas/minor-mode-menu nil
+ "Holds the YASnippet menu")
+
+(defun yas/init-minor-keymap ()
+ (let ((map (make-sparse-keymap)))
+ (easy-menu-define yas/minor-mode-menu
+ map
+ "Menu used when YAS/minor-mode is active."
+ '("YASnippet"
+ "----"
+ ["Expand trigger" yas/expand
+ :help "Possibly expand tab trigger before point"]
+ ["Insert at point..." yas/insert-snippet
+ :help "Prompt for an expandable snippet and expand it at point"]
+ ["New snippet..." yas/new-snippet
+ :help "Create a new snippet in an appropriate directory"]
+ ["Visit snippet file..." yas/visit-snippet-file
+ :help "Prompt for an expandable snippet and find its file"]
+ ["Find snippets..." yas/find-snippets
+ :help "Invoke `find-file' in the appropriate snippet directory"]
+ "----"
+ ("Snippet menu behaviour"
+ ["Visit snippets" (setq yas/visit-from-menu t)
+ :help "Visit snippets from the menu"
+ :active t :style radio :selected yas/visit-from-menu]
+ ["Expand snippets" (setq yas/visit-from-menu nil)
+ :help "Expand snippets from the menu"
+ :active t :style radio :selected (not yas/visit-from-menu)]
+ "----"
+ ["Show \"Real\" modes only" (setq yas/use-menu 'real-modes)
+ :help "Show snippet submenus for modes that appear to be real major modes"
+ :active t :style radio :selected (eq yas/use-menu 'real-modes)]
+ ["Show all modes" (setq yas/use-menu 't)
+ :help "Show one snippet submenu for each loaded table"
+ :active t :style radio :selected (eq yas/use-menu 't)]
+ ["Abbreviate according to current mode" (setq yas/use-menu 'abbreviate)
+ :help "Show only snippet submenus for the current active modes"
+ :active t :style radio :selected (eq yas/use-menu 'abbreviate)])
+ ("Indenting"
+ ["Auto" (setq yas/indent-line 'auto)
+ :help "Indent each line of the snippet with `indent-according-to-mode'"
+ :active t :style radio :selected (eq yas/indent-line 'auto)]
+ ["Fixed" (setq yas/indent-line 'fixed)
+ :help "Indent the snippet to the current column"
+ :active t :style radio :selected (eq yas/indent-line 'fixed)]
+ ["None" (setq yas/indent-line 'none)
+ :help "Don't apply any particular snippet indentation after expansion"
+ :active t :style radio :selected (not (member yas/indent-line '(fixed auto)))]
+ "----"
+ ["Also auto indent first line" (setq yas/also-auto-indent-first-line
+ (not yas/also-auto-indent-first-line))
+ :help "When auto-indenting also, auto indent the first line menu"
+ :active (eq yas/indent-line 'auto)
+ :style toggle :selected yas/also-auto-indent-first-line]
+ )
+ ("Prompting method"
+ ["System X-widget" (setq yas/prompt-functions
+ (cons 'yas/x-prompt
+ (remove 'yas/x-prompt
+ yas/prompt-functions)))
+ :help "Use your windowing system's (gtk, mac, windows, etc...) default menu"
+ :active t :style radio :selected (eq (car yas/prompt-functions)
+ 'yas/x-prompt)]
+ ["Dropdown-list" (setq yas/prompt-functions
+ (cons 'yas/dropdown-prompt
+ (remove 'yas/dropdown-prompt
+ yas/prompt-functions)))
+ :help "Use a special dropdown list"
+ :active t :style radio :selected (eq (car yas/prompt-functions)
+ 'yas/dropdown-prompt)]
+ ["Ido" (setq yas/prompt-functions
+ (cons 'yas/ido-prompt
+ (remove 'yas/ido-prompt
+ yas/prompt-functions)))
+ :help "Use an ido-style minibuffer prompt"
+ :active t :style radio :selected (eq (car yas/prompt-functions)
+ 'yas/ido-prompt)]
+ ["Completing read" (setq yas/prompt-functions
+ (cons 'yas/completing-prompt
+ (remove 'yas/completing-prompt-prompt
+ yas/prompt-functions)))
+ :help "Use a normal minibuffer prompt"
+ :active t :style radio :selected (eq (car yas/prompt-functions)
+ 'yas/completing-prompt-prompt)]
+ )
+ ("Misc"
+ ["Wrap region in exit marker"
+ (setq yas/wrap-around-region
+ (not yas/wrap-around-region))
+ :help "If non-nil automatically wrap the selected text in the $0 snippet exit"
+ :style toggle :selected yas/wrap-around-region]
+ ["Allow stacked expansions "
+ (setq yas/triggers-in-field
+ (not yas/triggers-in-field))
+ :help "If non-nil allow snippets to be triggered inside other snippet fields"
+ :style toggle :selected yas/triggers-in-field]
+ ["Revive snippets on undo "
+ (setq yas/snippet-revival
+ (not yas/snippet-revival))
+ :help "If non-nil allow snippets to become active again after undo"
+ :style toggle :selected yas/snippet-revival]
+ ["Good grace "
+ (setq yas/good-grace
+ (not yas/good-grace))
+ :help "If non-nil don't raise errors in bad embedded eslip in snippets"
+ :style toggle :selected yas/good-grace]
+ ["Ignore filenames as triggers"
+ (setq yas/ignore-filenames-as-triggers
+ (not yas/ignore-filenames-as-triggers))
+ :help "If non-nil don't derive tab triggers from filenames"
+ :style toggle :selected yas/ignore-filenames-as-triggers]
+ )
+ "----"
+ ["Load snippets..." yas/load-directory
+ :help "Load snippets from a specific directory"]
+ ["Reload everything" yas/reload-all
+ :help "Cleanup stuff, reload snippets, rebuild menus"]
+ ["About" yas/about
+ :help "Display some information about YASsnippet"]))
+ ;; Now for the stuff that has direct keybindings
+ ;;
+ (define-key map "\C-c&\C-s" 'yas/insert-snippet)
+ (define-key map "\C-c&\C-n" 'yas/new-snippet)
+ (define-key map "\C-c&\C-v" 'yas/visit-snippet-file)
+ (define-key map "\C-c&\C-f" 'yas/find-snippets)
+ map))
+
+(defvar yas/minor-mode-map (yas/init-minor-keymap)
+ "The keymap used when `yas/minor-mode' is active.")
+
+(defun yas/trigger-key-reload (&optional unbind-key)
+ "Rebind `yas/expand' to the new value of `yas/trigger-key'.
+
+With optional UNBIND-KEY, try to unbind that key from
+`yas/minor-mode-map'."
+ (when (and unbind-key
+ (stringp unbind-key)
+ (not (string= unbind-key "")))
+ (define-key yas/minor-mode-map (read-kbd-macro unbind-key) nil))
+ (when (and yas/trigger-key
+ (stringp yas/trigger-key)
+ (not (string= yas/trigger-key "")))
+ (define-key yas/minor-mode-map (read-kbd-macro yas/trigger-key) 'yas/expand)))
+
+;;;###autoload
+(define-minor-mode yas/minor-mode
+ "Toggle YASnippet mode.
+
+When YASnippet mode is enabled, the `tas/trigger-key' key expands
+snippets of code depending on the mode.
+
+With no argument, this command toggles the mode.
+positive prefix argument turns on the mode.
+Negative prefix argument turns off the mode.
+
+You can customize the key through `yas/trigger-key'.
+
+Key bindings:
+\\{yas/minor-mode-map}"
+ nil
+ ;; The indicator for the mode line.
+ " yas"
+ :group 'yasnippet
+ (when yas/minor-mode
+ (yas/trigger-key-reload)
+ ;; load all snippets definitions unless we still don't have a
+ ;; root-directory or some snippets have already been loaded.
+ (unless (or (null yas/root-directory)
+ (> (hash-table-count yas/snippet-tables) 0))
+ (yas/reload-all))))
+
+(defvar yas/dont-activate #'(lambda ()
+ (and yas/root-directory
+ (null (yas/get-snippet-tables))))
+ "If non-nil don't let `yas/minor-mode-on' active yas for this buffer.
+
+`yas/minor-mode-on' is usually called by `yas/global-mode' so
+this effectively lets you define exceptions to the \"global\"
+behaviour.")
+(make-variable-buffer-local 'yas/dont-activate)
+
+
+(defun yas/minor-mode-on ()
+ "Turn on YASnippet minor mode.
+
+Do this unless `yas/dont-activate' is t or the function
+`yas/get-snippet-tables' (which see), returns an empty list."
+ (interactive)
+ (unless (or (and (functionp yas/dont-activate)
+ (funcall yas/dont-activate))
+ (and (not (functionp yas/dont-activate))
+ yas/dont-activate))
+ (yas/minor-mode 1)))
+
+(defun yas/minor-mode-off ()
+ "Turn off YASnippet minor mode."
+ (interactive)
+ (yas/minor-mode -1))
+
+(define-globalized-minor-mode yas/global-mode yas/minor-mode yas/minor-mode-on
+ :group 'yasnippet
+ :require 'yasnippet)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Major mode stuff
+;;
+(defvar yas/font-lock-keywords
+ (append '(("^#.*$" . font-lock-comment-face))
+ lisp-font-lock-keywords
+ lisp-font-lock-keywords-1
+ lisp-font-lock-keywords-2
+ '(("$\\([0-9]+\\)"
+ (0 font-lock-keyword-face)
+ (1 font-lock-string-face t))
+ ("${\\([0-9]+\\):?"
+ (0 font-lock-keyword-face)
+ (1 font-lock-warning-face t))
+ ("${" font-lock-keyword-face)
+ ("$[0-9]+?" font-lock-preprocessor-face)
+ ("\\(\\$(\\)" 1 font-lock-preprocessor-face)
+ ("}"
+ (0 font-lock-keyword-face)))))
+
+(defun yas/init-major-keymap ()
+ (let ((map (make-sparse-keymap)))
+ (easy-menu-define nil
+ map
+ "Menu used when snippet-mode is active."
+ (cons "Snippet"
+ (mapcar #'(lambda (ent)
+ (when (third ent)
+ (define-key map (third ent) (second ent)))
+ (vector (first ent) (second ent) t))
+ (list
+ (list "Load this snippet" 'yas/load-snippet-buffer "\C-c\C-c")
+ (list "Try out this snippet" 'yas/tryout-snippet "\C-c\C-t")))))
+ map))
+
+(defvar snippet-mode-map
+ (yas/init-major-keymap)
+ "The keymap used when `snippet-mode' is active")
+
+
+(define-derived-mode snippet-mode text-mode "Snippet"
+ "A mode for editing yasnippets"
+ (set-syntax-table (standard-syntax-table))
+ (setq font-lock-defaults '(yas/font-lock-keywords))
+ (set (make-local-variable 'require-final-newline) nil)
+ (use-local-map snippet-mode-map))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Internal structs for template management
+
+(defstruct (yas/template (:constructor yas/make-template
+ (content name condition expand-env file keybinding)))
+ "A template for a snippet."
+ content
+ name
+ condition
+ expand-env
+ file
+ keybinding)
+
+(defvar yas/snippet-tables (make-hash-table)
+ "A hash table of MAJOR-MODE symbols to `yas/snippet-table' objects.")
+
+(defstruct (yas/snippet-table (:constructor yas/make-snippet-table (name)))
+ "A table to store snippets for a particular mode.
+
+Has the following fields:
+
+`yas/snippet-table-name'
+
+ A symbol normally corresponding to a major mode, but can also be
+ a pseudo major-mode to be referenced in `yas/mode-symbol', for
+ example.
+
+`yas/snippet-table-hash'
+
+ A hash table the key is a string (the snippet key) and the
+ value is yet another hash of (NAME TEMPLATE), where NAME is the
+ snippet name and TEMPLATE is a `yas/template' object name.
+
+`yas/snippet-table-parents'
+
+ A list of tables considered parents of this table: i.e. when
+ searching for expansions they are searched as well."
+ name
+ (hash (make-hash-table :test 'equal))
+ (parents nil))
+
+(defvar yas/better-guess-for-replacements nil
+ "If non-nil `yas/store' better guess snippet replacements.")
+
+(defun yas/store (table name key template)
+ "Store a snippet template in the TABLE."
+
+ ;; This is dones by searching twice:
+ ;;
+ ;; * Try to get the existing namehash from TABLE using key.
+ ;;
+ ;; * Try to get the existing namehash from by searching the *whole*
+ ;; snippet table for NAME. This is becuase they user might have
+ ;; changed the key and that can no longer be used to locate the
+ ;; previous `yas/template-structure'.
+ ;;
+ ;; * If that returns nothing, oh well...
+ ;;
+ (dolist (existing-namehash (remove nil (list (gethash key (yas/snippet-table-hash table))
+ (when yas/better-guess-for-replacements
+ (let (a)
+ (maphash #'(lambda (key namehash)
+ (when (gethash name namehash)
+ (setq a namehash)))
+ (yas/snippet-table-hash table))
+ a)))))
+ (let ((existing-template (gethash name existing-namehash)))
+ (when existing-template
+ ;; Remove the existing keybinding
+ (when (yas/template-keybinding existing-template)
+ (define-key
+ (symbol-value (first (yas/template-keybinding existing-template)))
+ (second (yas/template-keybinding existing-template))
+ nil)
+ (setq yas/active-keybindings
+ (delete (yas/template-keybinding existing-template)
+ yas/active-keybindings)))
+ ;; Remove the (name . template) mapping from existing-namehash.
+ (remhash name existing-namehash))))
+ ;; Now store the new template independent of the previous steps.
+ ;;
+ (puthash name
+ template
+ (or (gethash key
+ (yas/snippet-table-hash table))
+ (puthash key
+ (make-hash-table :test 'equal)
+ (yas/snippet-table-hash table)))))
+
+(defun yas/fetch (table key)
+ "Fetch a snippet binding to KEY from TABLE."
+ (let* ((keyhash (yas/snippet-table-hash table))
+ (namehash (and keyhash (gethash key keyhash))))
+ (when namehash
+ (yas/filter-templates-by-condition
+ (let (alist)
+ (maphash #'(lambda (k v)
+ (push (cons k v) alist))
+ namehash)
+ alist)))))
+
+
+;; Filtering/condition logic
+
+(defun yas/eval-condition (condition)
+ (condition-case err
+ (save-excursion
+ (save-restriction
+ (save-match-data
+ (eval condition))))
+ (error (progn
+ (message (format "[yas] error in condition evaluation: %s"
+ (error-message-string err)))
+ nil))))
+
+
+(defun yas/filter-templates-by-condition (templates)
+ "Filter the templates using the applicable condition.
+
+TEMPLATES is a list of cons (NAME . TEMPLATE) where NAME is a
+string and TEMPLATE is a `yas/template' structure.
+
+This function implements the rules described in
+`yas/buffer-local-condition'. See that variables documentation."
+ (let ((requirement (yas/require-template-specific-condition-p)))
+ (if (eq requirement 'always)
+ templates
+ (remove-if-not #'(lambda (pair)
+ (yas/template-can-expand-p (yas/template-condition (cdr pair)) requirement))
+ templates))))
+
+(defun yas/require-template-specific-condition-p ()
+ "Decides if this buffer requests/requires snippet-specific
+conditions to filter out potential expansions."
+ (if (eq 'always yas/buffer-local-condition)
+ 'always
+ (let ((local-condition (or (and (consp yas/buffer-local-condition)
+ (yas/eval-condition yas/buffer-local-condition))
+ yas/buffer-local-condition)))
+ (when local-condition
+ (if (eq local-condition t)
+ t
+ (and (consp local-condition)
+ (eq 'require-snippet-condition (car local-condition))
+ (symbolp (cdr local-condition))
+ (cdr local-condition)))))))
+
+(defun yas/template-can-expand-p (condition &optional requirement)
+ "Evaluates CONDITION and REQUIREMENT and returns a boolean"
+ (let* ((requirement (or requirement
+ (yas/require-template-specific-condition-p)))
+ (result (or (null condition)
+ (yas/eval-condition
+ (condition-case err
+ (read condition)
+ (error (progn
+ (message (format "[yas] error reading condition: %s"
+ (error-message-string err))))
+ nil))))))
+ (cond ((eq requirement t)
+ result)
+ (t
+ (eq requirement result)))))
+
+(defun yas/snippet-table-get-all-parents (table)
+ (let ((parents (yas/snippet-table-parents table)))
+ (when parents
+ (append (copy-list parents)
+ (mapcan #'yas/snippet-table-get-all-parents parents)))))
+
+(defun yas/snippet-table-templates (table)
+ (when table
+ (let ((acc (list)))
+ (maphash #'(lambda (key namehash)
+ (maphash #'(lambda (name template)
+ (push (cons name template) acc))
+ namehash))
+ (yas/snippet-table-hash table))
+ (yas/filter-templates-by-condition acc))))
+
+(defun yas/current-key ()
+ "Get the key under current position. A key is used to find
+the template of a snippet in the current snippet-table."
+ (let ((start (point))
+ (end (point))
+ (syntaxes yas/key-syntaxes)
+ syntax
+ done
+ templates)
+ (while (and (not done) syntaxes)
+ (setq syntax (car syntaxes))
+ (setq syntaxes (cdr syntaxes))
+ (save-excursion
+ (skip-syntax-backward syntax)
+ (setq start (point)))
+ (setq templates
+ (mapcan #'(lambda (table)
+ (yas/fetch table (buffer-substring-no-properties start end)))
+ (yas/get-snippet-tables)))
+ (if templates
+ (setq done t)
+ (setq start end)))
+ (list templates
+ start
+ end)))
+
+
+(defun yas/snippet-table-all-keys (table)
+ (when table
+ (let ((acc))
+ (maphash #'(lambda (key templates)
+ (when (yas/filter-templates-by-condition templates)
+ (push key acc)))
+ (yas/snippet-table-hash table))
+ acc)))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Internal functions
+
+(defun yas/real-mode? (mode)
+ "Try to find out if MODE is a real mode. The MODE bound to
+a function (like `c-mode') is considered real mode. Other well
+known mode like `ruby-mode' which is not part of Emacs might
+not bound to a function until it is loaded. So yasnippet keeps
+a list of modes like this to help the judgement."
+ (or (fboundp mode)
+ (find mode yas/known-modes)))
+
+(defun yas/read-and-eval-string (string)
+ ;; TODO: This is a possible optimization point, the expression could
+ ;; be stored in cons format instead of string,
+ "Evaluate STRING and convert the result to string."
+ (let ((retval (catch 'yas/exception
+ (condition-case err
+ (save-excursion
+ (save-restriction
+ (save-match-data
+ (widen)
+ (let ((result (eval (read string))))
+ (when result
+ (format "%s" result))))))
+ (error (if yas/good-grace
+ "[yas] elisp error!"
+ (error (format "[yas] elisp error: %s"
+ (error-message-string err)))))))))
+ (when (and (consp retval)
+ (eq 'yas/exception (car retval)))
+ (error (cdr retval)))
+ retval))
+
+(defvar yas/mode-symbol nil
+ "If non-nil, lookup snippets using this instead of `major-mode'.")
+(make-variable-buffer-local 'yas/mode-symbol)
+
+(defun yas/snippet-table-get-create (mode)
+ "Get the snippet table corresponding to MODE.
+
+Optional DIRECTORY gets recorded as the default directory to
+search for snippet files if the retrieved/created table didn't
+already have such a property."
+ (let ((table (gethash mode
+ yas/snippet-tables)))
+ (unless table
+ (setq table (yas/make-snippet-table (symbol-name mode)))
+ (puthash mode table yas/snippet-tables))
+ table))
+
+(defun yas/get-snippet-tables (&optional mode-symbol dont-search-parents)
+ "Get snippet tables for current buffer.
+
+Return a list of 'yas/snippet-table' objects indexed by mode.
+
+The modes are tried in this order: optional MODE-SYMBOL, then
+`yas/mode-symbol', then `major-mode' then, unless
+DONT-SEARCH-PARENTS is non-nil, the guessed parent mode of either
+MODE-SYMBOL or `major-mode'.
+
+Guessing is done by looking up the MODE-SYMBOL's
+`derived-mode-parent' property, see also `derived-mode-p'."
+ (let ((mode-tables
+ (mapcar #'(lambda (mode)
+ (gethash mode yas/snippet-tables))
+ (append (list mode-symbol)
+ (if (listp yas/mode-symbol)
+ yas/mode-symbol
+ (list yas/mode-symbol))
+ (list major-mode
+ (and (not dont-search-parents)
+ (get (or mode-symbol major-mode)
+ 'derived-mode-parent))))))
+ (all-tables))
+ (dolist (table (remove nil mode-tables))
+ (push table all-tables)
+ (nconc all-tables (yas/snippet-table-get-all-parents table)))
+ (remove-duplicates all-tables)))
+
+(defun yas/menu-keymap-get-create (mode)
+ "Get the menu keymap correspondong to MODE."
+ (or (gethash mode yas/menu-table)
+ (puthash mode (make-sparse-keymap) yas/menu-table)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; Template-related and snippet loading functions
+
+(defun yas/parse-template (&optional file)
+ "Parse the template in the current buffer.
+
+Optional FILE is the absolute file name of the file being
+parsed.
+
+Return a snippet-definition, i.e. a list
+
+ (KEY TEMPLATE NAME CONDITION GROUP VARS FILE KEYBINDING)
+
+If the buffer contains a line of \"# --\" then the contents
+above this line are ignored. Variables can be set above this
+line through the syntax:
+
+#name : value
+
+Here's a list of currently recognized variables:
+
+ * name
+ * contributor
+ * condition
+ * key
+ * group
+ * expand-env
+
+#name: #include \"...\"
+# --
+#include \"$1\""
+ ;;
+ ;;
+ (goto-char (point-min))
+ (let* ((name (and file
+ (file-name-nondirectory file)))
+ (key (unless yas/ignore-filenames-as-triggers
+ (and name
+ (file-name-sans-extension name))))
+ template
+ bound
+ condition
+ (group (and file
+ (yas/calculate-group file)))
+ expand-env
+ binding)
+ (if (re-search-forward "^# --\n" nil t)
+ (progn (setq template
+ (buffer-substring-no-properties (point)
+ (point-max)))
+ (setq bound (point))
+ (goto-char (point-min))
+ (while (re-search-forward "^# *\\([^ ]+?\\) *: *\\(.*\\)$" bound t)
+ (when (string= "name" (match-string-no-properties 1))
+ (setq name (match-string-no-properties 2)))
+ (when (string= "condition" (match-string-no-properties 1))
+ (setq condition (match-string-no-properties 2)))
+ (when (string= "group" (match-string-no-properties 1))
+ (setq group (match-string-no-properties 2)))
+ (when (string= "expand-env" (match-string-no-properties 1))
+ (setq expand-env (match-string-no-properties 2)))
+ (when (string= "key" (match-string-no-properties 1))
+ (setq key (match-string-no-properties 2)))
+ (when (string= "binding" (match-string-no-properties 1))
+ (setq binding (match-string-no-properties 2)))))
+ (setq template
+ (buffer-substring-no-properties (point-min) (point-max))))
+ (list key template name condition group expand-env file binding)))
+
+(defun yas/calculate-group (file)
+ "Calculate the group for snippet file path FILE."
+ (let* ((dominating-dir (locate-dominating-file file
+ ".yas-make-groups"))
+ (extra-path (and dominating-dir
+ (replace-regexp-in-string (concat "^"
+ (expand-file-name dominating-dir))
+ ""
+ (expand-file-name file))))
+ (extra-dir (and extra-path
+ (file-name-directory extra-path)))
+ (group (and extra-dir
+ (replace-regexp-in-string "/"
+ "."
+ (directory-file-name extra-dir)))))
+ group))
+
+;; (defun yas/glob-files (directory &optional recurse-p append)
+;; "Returns files under DIRECTORY ignoring dirs and hidden files.
+
+;; If RECURSE in non-nil, do that recursively."
+;; (let (ret
+;; (default-directory directory))
+;; (dolist (entry (directory-files "."))
+;; (cond ((or (string-match "^\\."
+;; (file-name-nondirectory entry))
+;; (string-match "~$"
+;; (file-name-nondirectory entry)))
+;; nil)
+;; ((and recurse-p
+;; (file-directory-p entry))
+;; (setq ret (nconc ret
+;; (yas/glob-files (expand-file-name entry)
+;; recurse-p
+;; (if append
+;; (concat append "/" entry)
+;; entry)))))
+;; ((file-directory-p entry)
+;; nil)
+;; (t
+;; (push (if append
+;; (concat append "/" entry)
+;; entry) ret))))
+;; ret))
+
+(defun yas/subdirs (directory &optional file?)
+ "Return subdirs or files of DIRECTORY according to FILE?."
+ (remove-if (lambda (file)
+ (or (string-match "^\\."
+ (file-name-nondirectory file))
+ (string-match "~$"
+ (file-name-nondirectory file))
+ (if file?
+ (file-directory-p file)
+ (not (file-directory-p file)))))
+ (directory-files directory t)))
+
+(defun yas/make-menu-binding (template)
+ `(lambda () (interactive) (yas/expand-or-visit-from-menu ,template)))
+
+(defun yas/expand-or-visit-from-menu (template)
+ (if yas/visit-from-menu
+ (yas/visit-snippet-file-1 template)
+ (let ((where (if mark-active
+ (cons (region-beginning) (region-end))
+ (cons (point) (point)))))
+ (yas/expand-snippet (yas/template-content template)
+ (car where)
+ (cdr where)))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Popping up for keys and templates
+;;
+(defun yas/prompt-for-template (templates &optional prompt)
+ "Interactively choose a template from the list TEMPLATES.
+
+TEMPLATES is a list of `yas/template'."
+ (when templates
+ (some #'(lambda (fn)
+ (funcall fn (or prompt "Choose a snippet: ")
+ templates
+ #'yas/template-name))
+ yas/prompt-functions)))
+
+(defun yas/prompt-for-keys (keys &optional prompt)
+ "Interactively choose a template key from the list KEYS."
+ (when keys
+ (some #'(lambda (fn)
+ (funcall fn (or prompt "Choose a snippet key: ") keys))
+ yas/prompt-functions)))
+
+(defun yas/prompt-for-table (tables &optional prompt)
+ (when tables
+ (some #'(lambda (fn)
+ (funcall fn (or prompt "Choose a snippet table: ")
+ tables
+ #'yas/snippet-table-name))
+ yas/prompt-functions)))
+
+(defun yas/x-prompt (prompt choices &optional display-fn)
+ (when (and window-system choices)
+ (let ((keymap (cons 'keymap
+ (cons
+ prompt
+ (mapcar (lambda (choice)
+ (list choice
+ 'menu-item
+ (if display-fn
+ (funcall display-fn choice)
+ choice)
+ t))
+ choices)))))
+ (when (cdr keymap)
+ (car (x-popup-menu (if (fboundp 'posn-at-point)
+ (let ((x-y (posn-x-y (posn-at-point (point)))))
+ (list (list (+ (car x-y) 10)
+ (+ (cdr x-y) 20))
+ (selected-window)))
+ t)
+ keymap))))))
+
+(defun yas/ido-prompt (prompt choices &optional display-fn)
+ (when (and (featurep 'ido)
+ ido-mode)
+ (let* ((formatted-choices (or (and display-fn
+ (mapcar display-fn choices))
+ choices))
+ (chosen (and formatted-choices
+ (ido-completing-read prompt
+ formatted-choices
+ nil
+ 'require-match
+ nil
+ nil))))
+ (when chosen
+ (nth (position chosen formatted-choices :test #'string=) choices)))))
+
+(eval-when-compile (require 'dropdown-list nil t))
+(defun yas/dropdown-prompt (prompt choices &optional display-fn)
+ (when (featurep 'dropdown-list)
+ (let* ((formatted-choices (or (and display-fn
+ (mapcar display-fn choices))
+ choices))
+ (chosen (and formatted-choices
+ (nth (dropdown-list formatted-choices)
+ choices))))
+ chosen)))
+
+(defun yas/completing-prompt (prompt choices &optional display-fn)
+ (let* ((formatted-choices (or (and display-fn
+ (mapcar display-fn choices))
+ choices))
+ (chosen (and formatted-choices
+ (completing-read prompt
+ formatted-choices
+ nil
+ 'require-match
+ nil
+ nil))))
+ (when chosen
+ (nth (position chosen formatted-choices :test #'string=) choices))))
+
+(defun yas/no-prompt (prompt choices &optional display-fn)
+ (first choices))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Loading snippets from files
+;;
+(defun yas/load-directory-1 (directory &optional parents no-hierarchy-parents making-groups-sym)
+ "Recursively load snippet templates from DIRECTORY."
+ ;; TODO: Rewrite this horrible, horrible monster I created
+ (unless (file-exists-p (concat directory "/" ".yas-skip"))
+ (let* ((major-mode-and-parents (unless making-groups-sym
+ (yas/compute-major-mode-and-parents (concat directory "/dummy")
+ nil
+ no-hierarchy-parents)))
+ (yas/ignore-filenames-as-triggers (or yas/ignore-filenames-as-triggers
+ (file-exists-p (concat directory "/" ".yas-ignore-filenames-as-triggers"))))
+ (mode-sym (and major-mode-and-parents
+ (car major-mode-and-parents)))
+ (parents (if making-groups-sym
+ parents
+ (rest major-mode-and-parents)))
+ (snippet-defs nil)
+ (make-groups-p (or making-groups-sym
+ (file-exists-p (concat directory "/" ".yas-make-groups")))))
+ (with-temp-buffer
+ (dolist (file (yas/subdirs directory 'no-subdirs-just-files))
+ (when (file-readable-p file)
+ (insert-file-contents file nil nil nil t)
+ (push (yas/parse-template file)
+ snippet-defs))))
+ (yas/define-snippets (or mode-sym
+ making-groups-sym)
+ snippet-defs
+ parents)
+ (dolist (subdir (yas/subdirs directory))
+ (if make-groups-p
+ (yas/load-directory-1 subdir parents 't (or mode-sym
+ making-groups-sym))
+ (yas/load-directory-1 subdir (list mode-sym)))))))
+
+(defun yas/load-directory (directory)
+ "Load snippet definition from a directory hierarchy.
+
+Below the top-level directory, each directory is a mode
+name. And under each subdirectory, each file is a definition
+of a snippet. The file name is the trigger key and the
+content of the file is the template."
+ (interactive "DSelect the root directory: ")
+ (unless (file-directory-p directory)
+ (error "Error %s not a directory" directory))
+ (unless yas/root-directory
+ (setq yas/root-directory directory))
+ (dolist (dir (yas/subdirs directory))
+ (yas/load-directory-1 dir nil 'no-hierarchy-parents))
+ (when (interactive-p)
+ (message "done.")))
+
+(defun yas/kill-snippet-keybindings ()
+ "Remove the all active snippet keybindings."
+ (interactive)
+ (dolist (keybinding yas/active-keybindings)
+ (define-key (symbol-value (first keybinding)) (second keybinding) nil))
+ (setq yas/active-keybindings nil))
+
+(defun yas/reload-all (&optional reset-root-directory)
+ "Reload all snippets and rebuild the YASnippet menu. "
+ (interactive "P")
+ ;; Turn off global modes and minor modes, save their state though
+ ;;
+ (let ((restore-global-mode (prog1 yas/global-mode
+ (yas/global-mode -1)))
+ (restore-minor-mode (prog1 yas/minor-mode
+ (yas/minor-mode -1))))
+ ;; Empty all snippet tables and all menu tables
+ ;;
+ (setq yas/snippet-tables (make-hash-table))
+ (setq yas/menu-table (make-hash-table))
+
+ ;; Init the `yas/minor-mode-map', taking care not to break the
+ ;; menu....
+ ;;
+ (setf (cdr yas/minor-mode-map)
+ (cdr (yas/init-minor-keymap)))
+
+ ;; Now, clean up the other keymaps we might have cluttered up.
+ (yas/kill-snippet-keybindings)
+
+ (when reset-root-directory
+ (setq yas/root-directory nil))
+
+ ;; Reload the directories listed in `yas/root-directory' or prompt
+ ;; the user to select one.
+ ;;
+ (if yas/root-directory
+ (if (listp yas/root-directory)
+ (dolist (directory yas/root-directory)
+ (yas/load-directory directory))
+ (yas/load-directory yas/root-directory))
+ (call-interactively 'yas/load-directory))
+
+ ;; Restore the mode configuration
+ ;;
+ (when restore-minor-mode
+ (yas/minor-mode 1))
+ (when restore-global-mode
+ (yas/global-mode 1))
+
+ (message "[yas] Reloading everything... Done.")))
+
+(defun yas/quote-string (string)
+ "Escape and quote STRING.
+foo\"bar\\! -> \"foo\\\"bar\\\\!\""
+ (concat "\""
+ (replace-regexp-in-string "[\\\"]"
+ "\\\\\\&"
+ string
+ t)
+ "\""))
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; Yasnippet Bundle
+
+(defun yas/initialize ()
+ "For backward compatibility, enable `yas/minor-mode' globally"
+ (yas/global-mode 1))
+
+(defun yas/compile-bundle
+ (&optional yasnippet yasnippet-bundle snippet-roots code dropdown)
+ "Compile snippets in SNIPPET-ROOTS to a single bundle file.
+
+YASNIPPET is the yasnippet.el file path.
+
+YASNIPPET-BUNDLE is the output file of the compile result.
+
+SNIPPET-ROOTS is a list of root directories that contains the
+snippets definition.
+
+CODE is the code to be placed at the end of the generated file
+and that can initialize the YASnippet bundle.
+
+Last optional argument DROPDOWN is the filename of the
+dropdown-list.el library.
+
+Here's the default value for all the parameters:
+
+ (yas/compile-bundle \"yasnippet.el\"
+ \"yasnippet-bundle.el\"
+ \"snippets\")
+ \"(yas/initialize-bundle)
+ ### autoload
+ (require 'yasnippet-bundle)`\"
+ \"dropdown-list.el\")
+"
+ (interactive "ffind the yasnippet.el file: \nFTarget bundle file: \nDSnippet directory to bundle: \nMExtra code? \nfdropdown-library: ")
+
+ (let* ((yasnippet (or yasnippet
+ "yasnippet.el"))
+ (yasnippet-bundle (or yasnippet-bundle
+ "./yasnippet-bundle.el"))
+ (snippet-roots (or snippet-roots
+ "snippets"))
+ (dropdown (or dropdown
+ "dropdown-list.el"))
+ (code (or (and code
+ (condition-case err (read code) (error nil))
+ code)
+ (concat "(yas/initialize-bundle)"
+ "\n;;;###autoload" ; break through so that won't
+ "(require 'yasnippet-bundle)")))
+ (dirs (or (and (listp snippet-roots) snippet-roots)
+ (list snippet-roots)))
+ (bundle-buffer nil))
+ (with-temp-file yasnippet-bundle
+ (insert ";;; yasnippet-bundle.el --- "
+ "Yet another snippet extension (Auto compiled bundle)\n")
+ (insert-file-contents yasnippet)
+ (goto-char (point-max))
+ (insert "\n")
+ (when dropdown
+ (insert-file-contents dropdown))
+ (goto-char (point-max))
+ (insert ";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\n")
+ (insert ";;;; Auto-generated code ;;;;\n")
+ (insert ";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\n")
+ (insert "(defun yas/initialize-bundle ()\n"
+ " \"Initialize YASnippet and load snippets in the bundle.\"")
+ (flet ((yas/define-snippets
+ (mode snippets &optional parent-or-parents)
+ (insert ";;; snippets for " (symbol-name mode) "\n")
+ (let ((literal-snippets (list)))
+ (dolist (snippet snippets)
+ (let ((key (first snippet))
+ (template-content (second snippet))
+ (name (third snippet))
+ (condition (fourth snippet))
+ (group (fifth snippet))
+ (expand-env (sixth snippet))
+ ;; Omit the file on purpose
+ (file nil) ;; (seventh snippet))
+ (binding (eighth snippet)))
+ (push `(,key
+ ,template-content
+ ,name
+ ,condition
+ ,group
+ ,expand-env
+ ,file
+ ,binding)
+ literal-snippets)))
+ (insert (pp-to-string `(yas/define-snippets ',mode ',literal-snippets ',parent-or-parents)))
+ (insert "\n\n"))))
+ (dolist (dir dirs)
+ (dolist (subdir (yas/subdirs dir))
+ (yas/load-directory-1 subdir nil 'no-hierarchy-parents))))
+
+ (insert (pp-to-string `(yas/global-mode 1)))
+ (insert ")\n\n" code "\n")
+
+ ;; bundle-specific provide and value for yas/dont-activate
+ (let ((bundle-feature-name (file-name-nondirectory
+ (file-name-sans-extension
+ yasnippet-bundle))))
+ (insert (pp-to-string `(set-default 'yas/dont-activate
+ #'(lambda ()
+ (and (or yas/root-directory
+ (featurep ',(make-symbol bundle-feature-name)))
+ (null (yas/get-snippet-tables)))))))
+ (insert (pp-to-string `(provide ',(make-symbol bundle-feature-name)))))
+
+ (insert ";;; "
+ (file-name-nondirectory yasnippet-bundle)
+ " ends here\n"))))
+
+(defun yas/compile-textmate-bundle ()
+ (interactive)
+ (yas/compile-bundle "yasnippet.el"
+ "./yasnippet-textmate-bundle.el"
+ "extras/imported/"
+ (concat "(yas/initialize-bundle)"
+ "\n;;;###autoload" ; break through so that won't
+ "(require 'yasnippet-textmate-bundle)")
+ "dropdown-list.el"))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; Some user level functions
+;;;
+
+(defun yas/about ()
+ (interactive)
+ (message (concat "yasnippet (version "
+ yas/version
+ ") -- pluskid <pluskid@gmail.com>/joaotavora <joaotavora@gmail.com>")))
+
+(defun yas/define-snippets (mode snippets &optional parent-mode)
+ "Define SNIPPETS for MODE.
+
+SNIPPETS is a list of snippet definitions, each taking the
+following form:
+
+ (KEY TEMPLATE NAME CONDITION GROUP EXPAND-ENV FILE KEYBINDING)
+
+Within these, only TEMPLATE is actually mandatory.
+
+All the elelements are strings, including CONDITION, EXPAND-ENV
+and KEYBINDING which will be `read' and eventually `eval'-ed.
+
+FILE is probably of very little use if you're programatically
+defining snippets.
+
+You can use `yas/parse-template' to return such lists based on
+the current buffers contents.
+
+Optional PARENT-MODE can be used to specify the parent tables of
+MODE. It can be a mode symbol of a list of mode symbols. It does
+not need to be a real mode."
+ (let ((snippet-table (yas/snippet-table-get-create mode))
+ (parent-tables (mapcar #'yas/snippet-table-get-create
+ (if (listp parent-mode)
+ parent-mode
+ (list parent-mode))))
+ (keymap (if yas/use-menu
+ (yas/menu-keymap-get-create mode)
+ nil)))
+ ;; Setup the menu
+ ;;
+ (when parent-tables
+ (setf (yas/snippet-table-parents snippet-table)
+ parent-tables)
+ (when yas/use-menu
+ (let ((parent-menu-syms-and-names
+ (if (listp parent-mode)
+ (mapcar #'(lambda (sym)
+ (cons sym (concat "parent mode - " (symbol-name sym))))
+ parent-mode)
+ '((parent-mode . "parent mode")))))
+ (mapc #'(lambda (sym-and-name)
+ (define-key keymap
+ (vector (intern (replace-regexp-in-string " " "_" (cdr sym-and-name))))
+ (list 'menu-item (cdr sym-and-name)
+ (yas/menu-keymap-get-create (car sym-and-name)))))
+ (reverse parent-menu-syms-and-names)))))
+ (when yas/use-menu
+ (define-key yas/minor-mode-menu (vector mode)
+ `(menu-item ,(symbol-name mode) ,keymap
+ :visible (yas/show-menu-p ',mode))))
+ ;; Iterate the recently parsed snippets definition
+ ;;
+ (dolist (snippet snippets)
+ (let* ((file (seventh snippet))
+ (key (or (car snippet)
+ (unless yas/ignore-filenames-as-triggers
+ (and file
+ (file-name-sans-extension (file-name-nondirectory file))))))
+ (name (or (third snippet)
+ (and file
+ (file-name-directory file))))
+ (condition (fourth snippet))
+ (group (fifth snippet))
+ (keybinding (eighth snippet))
+ (template nil))
+ ;; Read the snippet's "binding :" expression
+ ;;
+ (condition-case err
+ (when keybinding
+ (setq keybinding (read (eighth snippet)))
+ (let* ((this-mode-map-symbol (intern (concat (symbol-name mode) "-map")))
+ (keys (or (and (consp keybinding)
+ (read-kbd-macro (cdr keybinding)))
+ (read-kbd-macro keybinding)))
+ (keymap-symbol (or (and (consp keybinding)
+ (car keybinding))
+ this-mode-map-symbol)))
+ (if (and (boundp keymap-symbol)
+ (keymapp (symbol-value keymap-symbol)))
+ (setq keybinding (list keymap-symbol
+ keys
+ name))
+ (error (format "keymap \"%s\" does not (yet?) exist" keymap-symbol)))))
+ (error
+ (message "[yas] warning: keybinding \"%s\" invalid for snippet \"%s\" since %s."
+ keybinding name (error-message-string err))
+ (setf keybinding nil)))
+
+ ;; Create the `yas/template' object and store in the
+ ;; appropriate snippet table. This only done if we have found
+ ;; a key and a name for the snippet, because that is what
+ ;; indexes the snippet tables
+ ;;
+ (setq template (yas/make-template (second snippet)
+ (or name key)
+ condition
+ (sixth snippet)
+ (seventh snippet)
+ keybinding))
+ (when (and key
+ name)
+ (yas/store snippet-table
+ name
+ key
+ template))
+ ;; If we have a keybinding, register it if it does not
+ ;; conflict!
+ ;;
+ (when keybinding
+ (let ((lookup (lookup-key (symbol-value (first keybinding)) (second keybinding))))
+ (if (and lookup
+ (not (numberp lookup)))
+ (message "[yas] warning: won't overwrite keybinding \"%s\" for snippet \"%s\" in `%s'"
+ (key-description (second keybinding)) name (first keybinding))
+ (define-key
+ (symbol-value (first keybinding))
+ (second keybinding)
+ `(lambda (&optional yas/prefix)
+ (interactive "P")
+ (when (yas/template-can-expand-p ,(yas/template-condition template))
+ (yas/expand-snippet ,(yas/template-content template)
+ nil
+ nil
+ ,(yas/template-expand-env template)))))
+ (add-to-list 'yas/active-keybindings keybinding))))
+
+ ;; Setup the menu groups, reorganizing from group to group if
+ ;; necessary
+ ;;
+ (when yas/use-menu
+ (let ((group-keymap keymap))
+ ;; Delete this entry from another group if already exists
+ ;; in some other group. An entry is considered as existing
+ ;; in another group if its name string-matches.
+ ;;
+ (yas/delete-from-keymap group-keymap name)
+
+ ;; ... then add this entry to the correct group
+ (when (and (not (null group))
+ (not (string= "" group)))
+ (dolist (subgroup (mapcar #'make-symbol
+ (split-string group "\\.")))
+ (let ((subgroup-keymap (lookup-key group-keymap
+ (vector subgroup))))
+ (when (null subgroup-keymap)
+ (setq subgroup-keymap (make-sparse-keymap))
+ (define-key group-keymap (vector subgroup)
+ `(menu-item ,(symbol-name subgroup)
+ ,subgroup-keymap)))
+ (setq group-keymap subgroup-keymap))))
+ (define-key group-keymap (vector (gensym))
+ `(menu-item ,(yas/template-name template)
+ ,(yas/make-menu-binding template)
+ :help ,name
+ :keys ,(when (and key name)
+ (concat key yas/trigger-symbol))))))))))
+
+(defun yas/show-menu-p (mode)
+ (cond ((eq yas/use-menu 'abbreviate)
+ (find mode
+ (mapcar #'(lambda (table)
+ (intern (yas/snippet-table-name table)))
+ (yas/get-snippet-tables))))
+ ((eq yas/use-menu 'real-modes)
+ (yas/real-mode? mode))
+ (t
+ t)))
+
+(defun yas/delete-from-keymap (keymap name)
+ "Recursively delete items name NAME from KEYMAP and its submenus.
+
+Skip any submenus named \"parent mode\""
+ ;; First of all, recursively enter submenus, i.e. the tree is
+ ;; searched depth first so that stale submenus can be found in the
+ ;; higher passes.
+ ;;
+ (mapc #'(lambda (item)
+ (when (and (keymapp (fourth item))
+ (stringp (third item))
+ (not (string-match "parent mode" (third item))))
+ (yas/delete-from-keymap (fourth item) name)))
+ (rest keymap))
+ ;;
+ (when (keymapp keymap)
+ (let ((pos-in-keymap))
+ (while (setq pos-in-keymap
+ (position-if #'(lambda (item)
+ (and (listp item)
+ (or
+ ;; the menu item we want to delete
+ (and (eq 'menu-item (second item))
+ (third item)
+ (and (string= (third item) name)))
+ ;; a stale subgroup
+ (and (keymapp (fourth item))
+ (not (and (stringp (third item))
+ (string-match "parent mode"
+ (third item))))
+ (null (rest (fourth item)))))))
+ keymap))
+ (setf (nthcdr pos-in-keymap keymap)
+ (nthcdr (+ 1 pos-in-keymap) keymap))))))
+
+(defun yas/define (mode key template &optional name condition group)
+ "Define a snippet. Expanding KEY into TEMPLATE.
+
+NAME is a description to this template. Also update the menu if
+`yas/use-menu' is `t'. CONDITION is the condition attached to
+this snippet. If you attach a condition to a snippet, then it
+will only be expanded when the condition evaluated to non-nil."
+ (yas/define-snippets mode
+ (list (list key template name condition group))))
+
+(defun yas/hippie-try-expand (first-time?)
+ "Integrate with hippie expand. Just put this function in
+`hippie-expand-try-functions-list'."
+ (if (not first-time?)
+ (let ((yas/fallback-behavior 'return-nil))
+ (yas/expand))
+ (undo 1)
+ nil))
+
+(defun yas/expand ()
+ "Expand a snippet before point.
+
+If no snippet expansion is possible, fall back to the behaviour
+defined in `yas/fallback-behavior'"
+ (interactive)
+ (yas/expand-1))
+
+(defun yas/expand-1 (&optional field)
+ "Actually fo the work for `yas/expand'"
+ (multiple-value-bind (templates start end) (if field
+ (save-restriction
+ (narrow-to-region (yas/field-start field) (yas/field-end field))
+ (yas/current-key))
+ (yas/current-key))
+ (if templates
+ (let ((template (or (and (rest templates) ;; more than one
+ (yas/prompt-for-template (mapcar #'cdr templates)))
+ (cdar templates))))
+ (when template
+ (yas/expand-snippet (yas/template-content template)
+ start
+ end
+ (yas/template-expand-env template))))
+ (cond ((eq yas/fallback-behavior 'return-nil)
+ ;; return nil
+ nil)
+ ((eq yas/fallback-behavior 'call-other-command)
+ (let* ((yas/minor-mode nil)
+ (keys-1 (this-command-keys-vector))
+ (keys-2 (and yas/trigger-key
+ (stringp yas/trigger-key)
+ (read-kbd-macro yas/trigger-key)))
+ (command-1 (and keys-1 (key-binding keys-1)))
+ (command-2 (and keys-2 (key-binding keys-2)))
+ (command (or (and (not (eq command-1 'yas/expand))
+ command-1)
+ command-2)))
+ (when (and (commandp command)
+ (not (eq 'yas/expand command)))
+ (setq this-command command)
+ (call-interactively command))))
+ ((and (listp yas/fallback-behavior)
+ (cdr yas/fallback-behavior)
+ (eq 'apply (car yas/fallback-behavior)))
+ (if (cddr yas/fallback-behavior)
+ (apply (cadr yas/fallback-behavior)
+ (cddr yas/fallback-behavior))
+ (when (commandp (cadr yas/fallback-behavior))
+ (setq this-command (cadr yas/fallback-behavior))
+ (call-interactively (cadr yas/fallback-behavior)))))
+ (t
+ ;; also return nil if all the other fallbacks have failed
+ nil)))))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; Snippet development
+
+(defun yas/all-templates (tables)
+ "Return all snippet tables applicable for the current buffer.
+
+Honours `yas/choose-tables-first', `yas/choose-keys-first' and
+`yas/buffer-local-condition'"
+ (when yas/choose-tables-first
+ (setq tables (list (yas/prompt-for-table tables))))
+ (mapcar #'cdr
+ (if yas/choose-keys-first
+ (let ((key (yas/prompt-for-keys
+ (mapcan #'yas/snippet-table-all-keys tables))))
+ (when key
+ (mapcan #'(lambda (table)
+ (yas/fetch table key))
+ tables)))
+ (mapcan #'yas/snippet-table-templates tables))))
+
+(defun yas/insert-snippet (&optional no-condition)
+ "Choose a snippet to expand, pop-up a list of choices according
+to `yas/prompt-function'.
+
+With prefix argument NO-CONDITION, bypass filtering of snippets
+by condition."
+ (interactive "P")
+ (let* ((yas/buffer-local-condition (or (and no-condition
+ 'always)
+ yas/buffer-local-condition))
+ (templates (yas/all-templates (yas/get-snippet-tables)))
+ (template (and templates
+ (or (and (rest templates) ;; more than one template for same key
+ (yas/prompt-for-template templates))
+ (car templates))))
+ (where (if mark-active
+ (cons (region-beginning) (region-end))
+ (cons (point) (point)))))
+ (if template
+ (yas/expand-snippet (yas/template-content template)
+ (car where)
+ (cdr where)
+ (yas/template-expand-env template))
+ (message "[yas] No snippets can be inserted here!"))))
+
+(defun yas/visit-snippet-file ()
+ "Choose a snippet to edit, selection like `yas/insert-snippet'.
+
+Only success if selected snippet was loaded from a file. Put the
+visited file in `snippet-mode'."
+ (interactive)
+ (let* ((yas/buffer-local-condition 'always)
+ (templates (yas/all-templates (yas/get-snippet-tables)))
+ (template (and templates
+ (or (and (rest templates) ;; more than one template for same key
+ (yas/prompt-for-template templates
+ "Choose a snippet template to edit: "))
+ (car templates)))))
+
+ (when template
+ (yas/visit-snippet-file-1 template))))
+
+(defun yas/visit-snippet-file-1 (template)
+ (let ((file (yas/template-file template)))
+ (cond ((and file (file-exists-p file))
+ (find-file-other-window file)
+ (snippet-mode))
+ (file
+ (message "Original file %s no longer exists!" file))
+ (t
+ (message "This snippet was not loaded from a file!")))))
+
+(defun yas/guess-snippet-directories-1 (table &optional suffix)
+ "Guesses possible snippet subdirsdirectories for TABLE."
+ (unless suffix
+ (setq suffix (yas/snippet-table-name table)))
+ (cons suffix
+ (mapcan #'(lambda (parent)
+ (yas/guess-snippet-directories-1
+ parent
+ (concat (yas/snippet-table-name parent) "/" suffix)))
+ (yas/snippet-table-parents table))))
+
+(defun yas/guess-snippet-directories ()
+ "Try to guess suitable directories based on the current active
+tables.
+
+Returns a a list of options alist TABLE -> DIRS where DIRS are
+all the possibly directories where snippets of table might be
+lurking."
+ (let ((main-dir (or (and (listp yas/root-directory)
+ (first yas/root-directory))
+ yas/root-directory
+ (setq yas/root-directory "~/.emacs.d/snippets")))
+ (tables (yas/get-snippet-tables)))
+ ;; HACK! the snippet table created here is a dummy table that
+ ;; holds the correct name so that `yas/make-directory-maybe' can
+ ;; work. The real table, if it does not exist in
+ ;; yas/snippet-tables will be created when the first snippet for
+ ;; that mode is loaded.
+ ;;
+ (unless (gethash major-mode yas/snippet-tables)
+ (setq tables (cons (yas/make-snippet-table (symbol-name major-mode))
+ tables)))
+
+ (mapcar #'(lambda (table)
+ (cons table
+ (mapcar #'(lambda (subdir)
+ (concat main-dir "/" subdir))
+ (yas/guess-snippet-directories-1 table))))
+ tables)))
+
+(defun yas/make-directory-maybe (table-and-dirs &optional main-table-string)
+ "Returns a dir inside TABLE-AND-DIRS, prompts for creation if none exists."
+ (or (some #'(lambda (dir) (when (file-directory-p dir) dir)) (cdr table-and-dirs))
+ (let ((candidate (first (cdr table-and-dirs))))
+ (if (y-or-n-p (format "Guessed directory (%s) for%s%s table \"%s\" does not exist! Create? "
+ candidate
+ (if (gethash (intern (yas/snippet-table-name (car table-and-dirs)))
+ yas/snippet-tables)
+ ""
+ " brand new")
+ (or main-table-string
+ "")
+ (yas/snippet-table-name (car table-and-dirs))))
+ (progn
+ (make-directory candidate 'also-make-parents)
+ ;; create the .yas-parents file here...
+ candidate)))))
+
+(defun yas/new-snippet (&optional choose-instead-of-guess)
+ ""
+ (interactive "P")
+ (let* ((guessed-directories (yas/guess-snippet-directories))
+ (option (or (and choose-instead-of-guess
+ (some #'(lambda (fn)
+ (funcall fn "Choose a snippet table: "
+ guessed-directories
+ #'(lambda (option)
+ (yas/snippet-table-name (car option)))))
+ yas/prompt-functions))
+ (first guessed-directories)))
+ (chosen))
+ (setq chosen (yas/make-directory-maybe option (unless choose-instead-of-guess
+ " main")))
+ (unless (or chosen
+ choose-instead-of-guess)
+ (if (y-or-n-p (format "Continue guessing for other active tables %s? "
+ (mapcar #'(lambda (table-and-dirs)
+ (yas/snippet-table-name (car table-and-dirs)))
+ (rest guessed-directories))))
+ (setq chosen (some #'yas/make-directory-maybe
+ (rest guessed-directories)))))
+ (unless (or chosen
+ choose-instead-of-guess)
+ (when (y-or-n-p "Having trouble... use snippet root dir? ")
+ (setq chosen (if (listp yas/root-directory)
+ (first yas/root-directory)
+ yas/root-directory))))
+ (if chosen
+ (let ((default-directory chosen)
+ (name (read-from-minibuffer "Enter a snippet name: ")))
+ (find-file-other-window (concat name
+ ".yasnippet"))
+ (snippet-mode)
+ (unless (and choose-instead-of-guess
+ (not (y-or-n-p "Insert a snippet with useful headers? ")))
+ (yas/expand-snippet (format
+ "\
+# -*- mode: snippet -*-
+# name: %s
+# key: $1${2:
+# binding: \"${3:keybinding}\"}${4:
+# expand-env: ((${5:some-var} ${6:some-value}))}
+# --
+$0" name))))
+ (message "[yas] aborted snippet creation."))))
+
+(defun yas/find-snippets (&optional same-window )
+ "Look for user snippets in guessed current mode's directory.
+
+Calls `find-file' interactively in the guessed directory.
+
+With prefix arg SAME-WINDOW opens the buffer in the same window.
+
+Because snippets can be loaded from many different locations,
+this has to guess the correct directory using
+`yas/guess-snippet-directories', which returns a list of
+options.
+
+If any one of these exists, it is taken and `find-file' is called
+there, otherwise, proposes to create the first option returned by
+`yas/guess-snippet-directories'."
+ (interactive "P")
+ (let* ((guessed-directories (yas/guess-snippet-directories))
+ (chosen)
+ (buffer))
+ (setq chosen (yas/make-directory-maybe (first guessed-directories) " main"))
+ (unless chosen
+ (if (y-or-n-p (format "Continue guessing for other active tables %s? "
+ (mapcar #'(lambda (table-and-dirs)
+ (yas/snippet-table-name (car table-and-dirs)))
+ (rest guessed-directories))))
+ (setq chosen (some #'yas/make-directory-maybe
+ (rest guessed-directories)))))
+ (unless chosen
+ (when (y-or-n-p "Having trouble... go to snippet root dir? ")
+ (setq chosen (if (listp yas/root-directory)
+ (first yas/root-directory)
+ yas/root-directory))))
+ (if chosen
+ (let ((default-directory chosen))
+ (setq buffer (call-interactively (if same-window
+ 'find-file
+ 'find-file-other-window)))
+ (when buffer
+ (save-excursion
+ (set-buffer buffer)
+ (when (eq major-mode 'fundamental-mode)
+ (snippet-mode)))))
+ (message "Could not guess snippet dir!"))))
+
+(defun yas/compute-major-mode-and-parents (file &optional prompt-if-failed no-hierarchy-parents)
+ (let* ((file-dir (and file
+ (directory-file-name (or (locate-dominating-file file ".yas-make-groups")
+ (directory-file-name (file-name-directory file))))))
+ (major-mode-name (and file-dir
+ (file-name-nondirectory file-dir)))
+ (parent-file-dir (and file-dir
+ (directory-file-name (file-name-directory file-dir))))
+ (parent-mode-name (and parent-file-dir
+ (not no-hierarchy-parents)
+ (file-name-nondirectory parent-file-dir)))
+ (major-mode-sym (or (and major-mode-name
+ (intern major-mode-name))
+ (when prompt-if-failed
+ (read-from-minibuffer
+ "[yas] Cannot auto-detect major mode! Enter a major mode: "))))
+ (parent-mode-sym (and parent-mode-name
+ (intern parent-mode-name)))
+ (extra-parents-file-name (concat file-dir "/.yas-parents"))
+ (more-parents (when (file-readable-p extra-parents-file-name)
+ (mapcar #'intern
+ (split-string
+ (with-temp-buffer
+ (insert-file-contents extra-parents-file-name)
+ (buffer-substring-no-properties (point-min)
+ (point-max))))))))
+ (when major-mode-sym
+ (remove nil (append (list major-mode-sym parent-mode-sym)
+ more-parents)))))
+
+(defun yas/load-snippet-buffer (&optional kill)
+ "Parse and load current buffer's snippet definition.
+
+With optional prefix argument KILL quit the window and buffer."
+ (interactive "P")
+ (if buffer-file-name
+ (let ((major-mode-and-parent (yas/compute-major-mode-and-parents buffer-file-name)))
+ (if major-mode-and-parent
+ (let* ((parsed (yas/parse-template buffer-file-name))
+ (name (and parsed
+ (third parsed))))
+ (when name
+ (let ((yas/better-guess-for-replacements t))
+ (yas/define-snippets (car major-mode-and-parent)
+ (list parsed)
+ (cdr major-mode-and-parent)))
+ (when (and (buffer-modified-p)
+ (y-or-n-p "Save snippet? "))
+ (save-buffer))
+ (if kill
+ (quit-window kill)
+ (message "[yas] Snippet \"%s\" loaded for %s."
+ name
+ (car major-mode-and-parent)))))
+ (message "[yas] Cannot load snippet for unknown major mode")))
+ (message "Save the buffer as a file first!")))
+
+(defun yas/tryout-snippet (&optional debug)
+ "Test current buffers's snippet template in other buffer."
+ (interactive "P")
+ (let* ((major-mode-and-parent (yas/compute-major-mode-and-parents buffer-file-name))
+ (parsed (yas/parse-template))
+ (test-mode (or (and (car major-mode-and-parent)
+ (fboundp (car major-mode-and-parent))
+ (car major-mode-and-parent))
+ (intern (read-from-minibuffer "[yas] please input a mode: "))))
+ (template (and parsed
+ (fboundp test-mode)
+ (yas/make-template (second parsed)
+ (third parsed)
+ nil
+ (sixth parsed)
+ nil
+ nil))))
+ (cond (template
+ (let ((buffer-name (format "*YAS TEST: %s*" (yas/template-name template))))
+ (set-buffer (switch-to-buffer buffer-name))
+ (erase-buffer)
+ (setq buffer-undo-list nil)
+ (funcall test-mode)
+ (yas/expand-snippet (yas/template-content template)
+ (point-min)
+ (point-max)
+ (yas/template-expand-env template))
+ (when debug
+ (add-hook 'post-command-hook 'yas/debug-snippet-vars 't 'local))))
+ (t
+ (message "[yas] Cannot test snippet for unknown major mode")))))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; User convenience functions, for using in snippet definitions
+
+(defvar yas/modified-p nil
+ "Non-nil if field has been modified by user or transformation.")
+
+(defvar yas/moving-away-p nil
+ "Non-nil if user is about to exit field.")
+
+(defvar yas/text nil
+ "Contains current field text.")
+
+(defun yas/substr (str pattern &optional subexp)
+ "Search PATTERN in STR and return SUBEXPth match.
+
+If found, the content of subexp group SUBEXP (default 0) is
+ returned, or else the original STR will be returned."
+ (let ((grp (or subexp 0)))
+ (save-match-data
+ (if (string-match pattern str)
+ (match-string-no-properties grp str)
+ str))))
+
+(defun yas/choose-value (possibilities)
+ "Prompt for a string in the list POSSIBILITIES and return it."
+ (unless (or yas/moving-away-p
+ yas/modified-p)
+ (some #'(lambda (fn)
+ (funcall fn "Choose: " possibilities))
+ yas/prompt-functions)))
+
+(defun yas/key-to-value (alist)
+ "Prompt for a string in the list POSSIBILITIES and return it."
+ (unless (or yas/moving-away-p
+ yas/modified-p)
+ (let ((key (read-key-sequence "")))
+ (when (stringp key)
+ (or (cdr (find key alist :key #'car :test #'string=))
+ key)))))
+
+(defun yas/throw (text)
+ "Throw a yas/exception with TEXT as the reason."
+ (throw 'yas/exception (cons 'yas/exception text)))
+
+(defun yas/verify-value (possibilities)
+ "Verify that the current field value is in POSSIBILITIES
+
+Otherwise throw exception."
+ (when (and yas/moving-away-p (notany #'(lambda (pos) (string= pos yas/text)) possibilities))
+ (yas/throw (format "[yas] field only allows %s" possibilities))))
+
+(defun yas/field-value (number)
+ (let* ((snippet (car (yas/snippets-at-point)))
+ (field (and snippet
+ (yas/snippet-find-field snippet number))))
+ (when field
+ (yas/field-text-for-display field))))
+
+(defun yas/default-from-field (number)
+ (unless yas/modified-p
+ (yas/field-value number)))
+
+(defun yas/inside-string ()
+ (equal 'font-lock-string-face (get-char-property (1- (point)) 'face)))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; Snippet expansion and field management
+
+(defvar yas/active-field-overlay nil
+ "Overlays the currently active field.")
+
+(defvar yas/field-protection-overlays nil
+ "Two overlays protect the current active field ")
+
+(defconst yas/prefix nil
+ "A prefix argument for expansion direct from keybindings")
+
+(defvar yas/deleted-text nil
+ "The text deleted in the last snippet expansion.")
+
+(defvar yas/selected-text nil
+ "The selected region deleted on the last snippet expansion.")
+
+(defvar yas/start-column nil
+ "The column where the snippet expansion started.")
+
+(make-variable-buffer-local 'yas/active-field-overlay)
+(make-variable-buffer-local 'yas/field-protection-overlays)
+(make-variable-buffer-local 'yas/deleted-text)
+
+(defstruct (yas/snippet (:constructor yas/make-snippet ()))
+ "A snippet.
+
+..."
+ (fields '())
+ (exit nil)
+ (id (yas/snippet-next-id) :read-only t)
+ (control-overlay nil)
+ active-field
+ ;; stacked expansion: the `previous-active-field' slot saves the
+ ;; active field where the child expansion took place
+ previous-active-field
+ force-exit)
+
+(defstruct (yas/field (:constructor yas/make-field (number start end parent-field)))
+ "A field."
+ number
+ start end
+ parent-field
+ (mirrors '())
+ (transform nil)
+ (modified-p nil)
+ next)
+
+(defstruct (yas/mirror (:constructor yas/make-mirror (start end transform)))
+ "A mirror."
+ start end
+ (transform nil)
+ next)
+
+(defstruct (yas/exit (:constructor yas/make-exit (marker)))
+ marker
+ next)
+
+(defun yas/apply-transform (field-or-mirror field)
+ "Calculate the value of the field/mirror. If there's a transform
+for this field, apply it. Otherwise, returned nil."
+ (let* ((yas/text (yas/field-text-for-display field))
+ (text yas/text)
+ (yas/modified-p (yas/field-modified-p field))
+ (yas/moving-away-p nil)
+ (transform (if (yas/mirror-p field-or-mirror)
+ (yas/mirror-transform field-or-mirror)
+ (yas/field-transform field-or-mirror)))
+ (start-point (if (yas/mirror-p field-or-mirror)
+ (yas/mirror-start field-or-mirror)
+ (yas/field-start field-or-mirror)))
+ (transformed (and transform
+ (save-excursion
+ (goto-char start-point)
+ (yas/read-and-eval-string transform)))))
+ transformed))
+
+(defsubst yas/replace-all (from to &optional text)
+ "Replace all occurance from FROM to TO.
+
+With optional string TEXT do it in that string."
+ (if text
+ (replace-regexp-in-string (regexp-quote from) to text t t)
+ (goto-char (point-min))
+ (while (search-forward from nil t)
+ (replace-match to t t text))))
+
+(defun yas/snippet-find-field (snippet number)
+ (find-if #'(lambda (field)
+ (eq number (yas/field-number field)))
+ (yas/snippet-fields snippet)))
+
+(defun yas/snippet-sort-fields (snippet)
+ "Sort the fields of SNIPPET in navigation order."
+ (setf (yas/snippet-fields snippet)
+ (sort (yas/snippet-fields snippet)
+ '(lambda (field1 field2)
+ (yas/snippet-field-compare field1 field2)))))
+
+(defun yas/snippet-field-compare (field1 field2)
+ "Compare two fields. The field with a number is sorted first.
+If they both have a number, compare through the number. If neither
+have, compare through the field's start point"
+ (let ((n1 (yas/field-number field1))
+ (n2 (yas/field-number field2)))
+ (if n1
+ (if n2
+ (< n1 n2)
+ t)
+ (if n2
+ nil
+ (< (yas/field-start field1)
+ (yas/field-start field2))))))
+
+(defun yas/field-probably-deleted-p (snippet field)
+ "Guess if SNIPPET's FIELD should be skipped."
+ (and (zerop (- (yas/field-start field) (yas/field-end field)))
+ (or (yas/field-parent-field field)
+ (and (eq field (car (last (yas/snippet-fields snippet))))
+ (= (yas/field-start field) (overlay-end (yas/snippet-control-overlay snippet)))))))
+
+(defun yas/snippets-at-point (&optional all-snippets)
+ "Return a sorted list of snippets at point, most recently
+inserted first."
+ (sort
+ (remove nil (remove-duplicates (mapcar #'(lambda (ov)
+ (overlay-get ov 'yas/snippet))
+ (if all-snippets
+ (overlays-in (point-min) (point-max))
+ (overlays-at (point))))))
+ #'(lambda (s1 s2)
+ (<= (yas/snippet-id s2) (yas/snippet-id s1)))))
+
+(defun yas/next-field-or-maybe-expand ()
+ "Try to expand a snippet at a key before point, otherwise
+delegate to `yas/next-field'."
+ (interactive)
+ (if yas/triggers-in-field
+ (let ((yas/fallback-behavior 'return-nil)
+ (active-field (overlay-get yas/active-field-overlay 'yas/field)))
+ (when active-field
+ (unless (yas/expand-1 active-field)
+ (yas/next-field))))
+ (yas/next-field)))
+
+(defun yas/next-field (&optional arg)
+ "Navigate to next field. If there's none, exit the snippet."
+ (interactive)
+ (let* ((arg (or arg
+ 1))
+ (snippet (first (yas/snippets-at-point)))
+ (active-field (overlay-get yas/active-field-overlay 'yas/field))
+ (live-fields (remove-if #'(lambda (field)
+ (and (not (eq field active-field))
+ (yas/field-probably-deleted-p snippet field)))
+ (yas/snippet-fields snippet)))
+ (active-field-pos (position active-field live-fields))
+ (target-pos (and active-field-pos (+ arg active-field-pos)))
+ (target-field (nth target-pos live-fields)))
+ ;; First check if we're moving out of a field with a transform
+ ;;
+ (when (and active-field
+ (yas/field-transform active-field))
+ (let* ((yas/moving-away-p t)
+ (yas/text (yas/field-text-for-display active-field))
+ (text yas/text)
+ (yas/modified-p (yas/field-modified-p active-field)))
+ ;; primary field transform: exit call to field-transform
+ (yas/read-and-eval-string (yas/field-transform active-field))))
+ ;; Now actually move...
+ (cond ((>= target-pos (length live-fields))
+ (yas/exit-snippet snippet))
+ (target-field
+ (yas/move-to-field snippet target-field))
+ (t
+ nil))))
+
+(defun yas/place-overlays (snippet field)
+ "Correctly place overlays for SNIPPET's FIELD"
+ (yas/make-move-field-protection-overlays snippet field)
+ (yas/make-move-active-field-overlay snippet field))
+
+(defun yas/move-to-field (snippet field)
+ "Update SNIPPET to move to field FIELD.
+
+Also create some protection overlays"
+ (goto-char (yas/field-start field))
+ (setf (yas/snippet-active-field snippet) field)
+ (yas/place-overlays snippet field)
+ (overlay-put yas/active-field-overlay 'yas/field field)
+ ;; primary field transform: first call to snippet transform
+ (unless (yas/field-modified-p field)
+ (if (yas/field-update-display field snippet)
+ (let ((inhibit-modification-hooks t))
+ (yas/update-mirrors snippet))
+ (setf (yas/field-modified-p field) nil))))
+
+(defun yas/prev-field ()
+ "Navigate to prev field. If there's none, exit the snippet."
+ (interactive)
+ (yas/next-field -1))
+
+(defun yas/abort-snippet (&optional snippet)
+ (interactive)
+ (let ((snippet (or snippet
+ (car (yas/snippets-at-point)))))
+ (when snippet
+ (setf (yas/snippet-force-exit snippet) t))))
+
+(defun yas/exit-snippet (snippet)
+ "Goto exit-marker of SNIPPET."
+ (interactive)
+ (setf (yas/snippet-force-exit snippet) t)
+ (goto-char (if (yas/snippet-exit snippet)
+ (yas/exit-marker (yas/snippet-exit snippet))
+ (overlay-end (yas/snippet-control-overlay snippet)))))
+
+(defun yas/exit-all-snippets ()
+ "Exit all snippets."
+ (interactive)
+ (mapc #'(lambda (snippet)
+ (yas/exit-snippet snippet)
+ (yas/check-commit-snippet))
+ (yas/snippets-at-point)))
+
+
+;;; Apropos markers-to-points:
+;;;
+;;; This was found useful for performance reasons, so that an
+;;; excessive number of live markers aren't kept around in the
+;;; `buffer-undo-list'. However, in `markers-to-points', the
+;;; set-to-nil markers can't simply be discarded and replaced with
+;;; fresh ones in `points-to-markers'. The original marker that was
+;;; just set to nil has to be reused.
+;;;
+;;; This shouldn't bring horrible problems with undo/redo, but it
+;;; you never know
+;;;
+
+(defun yas/markers-to-points (snippet)
+ "Convert all markers in SNIPPET to a cons (POINT . MARKER)
+where POINT is the original position of the marker and MARKER is
+the original marker object with the position set to nil."
+ (dolist (field (yas/snippet-fields snippet))
+ (let ((start (marker-position (yas/field-start field)))
+ (end (marker-position (yas/field-end field))))
+ (set-marker (yas/field-start field) nil)
+ (set-marker (yas/field-end field) nil)
+ (setf (yas/field-start field) (cons start (yas/field-start field)))
+ (setf (yas/field-end field) (cons end (yas/field-end field))))
+ (dolist (mirror (yas/field-mirrors field))
+ (let ((start (marker-position (yas/mirror-start mirror)))
+ (end (marker-position (yas/mirror-end mirror))))
+ (set-marker (yas/mirror-start mirror) nil)
+ (set-marker (yas/mirror-end mirror) nil)
+ (setf (yas/mirror-start mirror) (cons start (yas/mirror-start mirror)))
+ (setf (yas/mirror-end mirror) (cons end (yas/mirror-end mirror))))))
+ (let ((snippet-exit (yas/snippet-exit snippet)))
+ (when snippet-exit
+ (let ((exit (marker-position (yas/exit-marker snippet-exit))))
+ (set-marker (yas/exit-marker snippet-exit) nil)
+ (setf (yas/exit-marker snippet-exit) (cons exit (yas/exit-marker snippet-exit)))))))
+
+(defun yas/points-to-markers (snippet)
+ "Convert all cons (POINT . MARKER) in SNIPPET to markers. This
+is done by setting MARKER to POINT with `set-marker'."
+ (dolist (field (yas/snippet-fields snippet))
+ (setf (yas/field-start field) (set-marker (cdr (yas/field-start field))
+ (car (yas/field-start field))))
+ (setf (yas/field-end field) (set-marker (cdr (yas/field-end field))
+ (car (yas/field-end field))))
+ (dolist (mirror (yas/field-mirrors field))
+ (setf (yas/mirror-start mirror) (set-marker (cdr (yas/mirror-start mirror))
+ (car (yas/mirror-start mirror))))
+ (setf (yas/mirror-end mirror) (set-marker (cdr (yas/mirror-end mirror))
+ (car (yas/mirror-end mirror))))))
+ (let ((snippet-exit (yas/snippet-exit snippet)))
+ (when snippet-exit
+ (setf (yas/exit-marker snippet-exit) (set-marker (cdr (yas/exit-marker snippet-exit))
+ (car (yas/exit-marker snippet-exit)))))))
+
+(defun yas/commit-snippet (snippet &optional no-hooks)
+ "Commit SNIPPET, but leave point as it is. This renders the
+snippet as ordinary text.
+
+Return a buffer position where the point should be placed if
+exiting the snippet.
+
+NO-HOOKS means don't run the `yas/after-exit-snippet-hook' hooks."
+
+ (let ((control-overlay (yas/snippet-control-overlay snippet))
+ yas/snippet-beg
+ yas/snippet-end)
+ ;;
+ ;; Save the end of the moribund snippet in case we need to revive it
+ ;; its original expansion.
+ ;;
+ (when (and control-overlay
+ (overlay-buffer control-overlay))
+ (setq yas/snippet-beg (overlay-start control-overlay))
+ (setq yas/snippet-end (overlay-end control-overlay))
+ (delete-overlay control-overlay))
+
+ (let ((inhibit-modification-hooks t))
+ (when yas/active-field-overlay
+ (delete-overlay yas/active-field-overlay))
+ (when yas/field-protection-overlays
+ (mapc #'delete-overlay yas/field-protection-overlays)))
+
+ ;; stacked expansion: if the original expansion took place from a
+ ;; field, make sure we advance it here at least to
+ ;; `yas/snippet-end'...
+ ;;
+ (let ((previous-field (yas/snippet-previous-active-field snippet)))
+ (when (and yas/snippet-end previous-field)
+ (yas/advance-end-maybe previous-field yas/snippet-end)))
+
+ ;; Convert all markers to points,
+ ;;
+ (yas/markers-to-points snippet)
+
+ ;; Take care of snippet revival
+ ;;
+ (if yas/snippet-revival
+ (push `(apply yas/snippet-revive ,yas/snippet-beg ,yas/snippet-end ,snippet)
+ buffer-undo-list)
+ ;; Dismember the snippet... this is useful if we get called
+ ;; again from `yas/take-care-of-redo'....
+ (setf (yas/snippet-fields snippet) nil))
+
+ ;; XXX: `yas/after-exit-snippet-hook' should be run with
+ ;; `yas/snippet-beg' and `yas/snippet-end' bound. That might not
+ ;; be the case if the main overlay had somehow already
+ ;; disappeared, which sometimes happens when the snippet's messed
+ ;; up...
+ ;;
+ (unless no-hooks (run-hooks 'yas/after-exit-snippet-hook)))
+
+ (message "[yas] snippet exited."))
+
+(defun yas/check-commit-snippet ()
+ "Checks if point exited the currently active field of the
+snippet, if so cleans up the whole snippet up."
+ (let* ((snippets (yas/snippets-at-point 'all-snippets))
+ (snippets-left snippets))
+ (dolist (snippet snippets)
+ (let ((active-field (yas/snippet-active-field snippet)))
+ (cond ((or (prog1 (yas/snippet-force-exit snippet)
+ (setf (yas/snippet-force-exit snippet) nil))
+ (not (and active-field (yas/field-contains-point-p active-field))))
+ (setq snippets-left (delete snippet snippets-left))
+ (yas/commit-snippet snippet snippets-left))
+ ((and active-field
+ (or (not yas/active-field-overlay)
+ (not (overlay-buffer yas/active-field-overlay))))
+ ;;
+ ;; stacked expansion: this case is mainly for recent
+ ;; snippet exits that place us back int the field of
+ ;; another snippet
+ ;;
+ (save-excursion
+ (yas/move-to-field snippet active-field)
+ (yas/update-mirrors snippet)))
+ (t
+ nil))))
+ (unless snippets-left
+ (remove-hook 'post-command-hook 'yas/post-command-handler 'local)
+ (remove-hook 'pre-command-hook 'yas/pre-command-handler 'local))))
+
+(defun yas/field-contains-point-p (field &optional point)
+ (let ((point (or point
+ (point))))
+ (and (>= point (yas/field-start field))
+ (<= point (yas/field-end field)))))
+
+(defun yas/field-text-for-display (field)
+ "Return the propertized display text for field FIELD. "
+ (buffer-substring (yas/field-start field) (yas/field-end field)))
+
+(defun yas/undo-in-progress ()
+ "True if some kind of undo is in progress"
+ (or undo-in-progress
+ (eq this-command 'undo)
+ (eq this-command 'redo)))
+
+(defun yas/make-control-overlay (snippet start end)
+ "Creates the control overlay that surrounds the snippet and
+holds the keymap."
+ (let ((overlay (make-overlay start
+ end
+ nil
+ nil
+ t)))
+ (overlay-put overlay 'keymap yas/keymap)
+ (overlay-put overlay 'yas/snippet snippet)
+ overlay))
+
+(defun yas/skip-and-clear-or-delete-char (&optional field)
+ "Clears unmodified field if at field start, skips to next tab.
+
+Otherwise deletes a character normally by calling `delete-char'."
+ (interactive)
+ (let ((field (or field
+ (and yas/active-field-overlay
+ (overlay-buffer yas/active-field-overlay)
+ (overlay-get yas/active-field-overlay 'yas/field)))))
+ (cond ((and field
+ (not (yas/field-modified-p field))
+ (eq (point) (marker-position (yas/field-start field))))
+ (yas/skip-and-clear field)
+ (yas/next-field 1))
+ (t
+ (call-interactively 'delete-char)))))
+
+(defun yas/skip-and-clear (field)
+ "Deletes the region of FIELD and sets it modified state to t"
+ (setf (yas/field-modified-p field) t)
+ (delete-region (yas/field-start field) (yas/field-end field)))
+
+(defun yas/make-move-active-field-overlay (snippet field)
+ "Place the active field overlay in SNIPPET's FIELD.
+
+Move the overlay, or create it if it does not exit."
+ (if (and yas/active-field-overlay
+ (overlay-buffer yas/active-field-overlay))
+ (move-overlay yas/active-field-overlay
+ (yas/field-start field)
+ (yas/field-end field))
+ (setq yas/active-field-overlay
+ (make-overlay (yas/field-start field)
+ (yas/field-end field)
+ nil nil t))
+ (overlay-put yas/active-field-overlay 'priority 100)
+ (overlay-put yas/active-field-overlay 'face 'yas/field-highlight-face)
+ (overlay-put yas/active-field-overlay 'yas/snippet snippet)
+ (overlay-put yas/active-field-overlay 'modification-hooks '(yas/on-field-overlay-modification))
+ (overlay-put yas/active-field-overlay 'insert-in-front-hooks
+ '(yas/on-field-overlay-modification))
+ (overlay-put yas/active-field-overlay 'insert-behind-hooks
+ '(yas/on-field-overlay-modification))))
+
+(defun yas/on-field-overlay-modification (overlay after? beg end &optional length)
+ "Clears the field and updates mirrors, conditionally.
+
+Only clears the field if it hasn't been modified and it point it
+at field start. This hook doesn't do anything if an undo is in
+progress."
+ (unless (yas/undo-in-progress)
+ (let ((field (overlay-get yas/active-field-overlay 'yas/field)))
+ (cond (after?
+ (yas/advance-end-maybe field (overlay-end overlay))
+;;; primary field transform: normal calls to expression
+ (let ((saved-point (point)))
+ (yas/field-update-display field (car (yas/snippets-at-point)))
+ (goto-char saved-point))
+ (yas/update-mirrors (car (yas/snippets-at-point))))
+ (field
+ (when (and (not after?)
+ (not (yas/field-modified-p field))
+ (eq (point) (if (markerp (yas/field-start field))
+ (marker-position (yas/field-start field))
+ (yas/field-start field))))
+ (yas/skip-and-clear field))
+ (setf (yas/field-modified-p field) t))))))
+
+;;; Apropos protection overlays:
+;;;
+;;; These exist for nasty users who will try to delete parts of the
+;;; snippet outside the active field. Actual protection happens in
+;;; `yas/on-protection-overlay-modification'.
+;;;
+;;; Currently this signals an error which inhibits the command. For
+;;; commands that move point (like `kill-line'), point is restored in
+;;; the `yas/post-command-handler' using a global
+;;; `yas/protection-violation' variable.
+;;;
+;;; Alternatively, I've experimented with an implementation that
+;;; commits the snippet before actually calling `this-command'
+;;; interactively, and then signals an eror, which is ignored. but
+;;; blocks all other million modification hooks. This presented some
+;;; problems with stacked expansion.
+;;;
+
+(defun yas/make-move-field-protection-overlays (snippet field)
+ "Place protection overlays surrounding SNIPPET's FIELD.
+
+Move the overlays, or create them if they do not exit."
+ (let ((start (yas/field-start field))
+ (end (yas/field-end field)))
+ ;; First check if the (1+ end) is contained in the buffer,
+ ;; otherwise we'll have to do a bit of cheating and silently
+ ;; insert a newline. the `(1+ (buffer-size))' should prevent this
+ ;; when using stacked expansion
+ ;;
+ (when (< (buffer-size) end)
+ (save-excursion
+ (let ((inhibit-modification-hooks t))
+ (goto-char (point-max))
+ (newline))))
+ ;; go on to normal overlay creation/moving
+ ;;
+ (cond ((and yas/field-protection-overlays
+ (every #'overlay-buffer yas/field-protection-overlays))
+ (move-overlay (first yas/field-protection-overlays) (1- start) start)
+ (move-overlay (second yas/field-protection-overlays) end (1+ end)))
+ (t
+ (setq yas/field-protection-overlays
+ (list (make-overlay (1- start) start nil t nil)
+ (make-overlay end (1+ end) nil t nil)))
+ (dolist (ov yas/field-protection-overlays)
+ (overlay-put ov 'face 'yas/field-debug-face)
+ (overlay-put ov 'yas/snippet snippet)
+ ;; (overlay-put ov 'evaporate t)
+ (overlay-put ov 'modification-hooks '(yas/on-protection-overlay-modification)))))))
+
+(defvar yas/protection-violation nil
+ "When non-nil, signals attempts to erronesly exit or modify the snippet.
+
+Functions in the `post-command-hook', for example
+`yas/post-command-handler' can check it and reset its value to
+nil. The variables value is the point where the violation
+originated")
+
+(defun yas/on-protection-overlay-modification (overlay after? beg end &optional length)
+ "Signals a snippet violation, then issues error.
+
+The error should be ignored in `debug-ignored-errors'"
+ (cond ((not (or after?
+ (yas/undo-in-progress)))
+ (setq yas/protection-violation (point))
+ (error "Exit the snippet first!"))))
+
+(add-to-list 'debug-ignored-errors "^Exit the snippet first!$")
+
+
+;;; Apropos stacked expansion:
+;;;
+;;; the parent snippet does not run its fields modification hooks
+;;; (`yas/on-field-overlay-modification' and
+;;; `yas/on-protection-overlay-modification') while the child snippet
+;;; is active. This means, among other things, that the mirrors of the
+;;; parent snippet are not updated, this only happening when one exits
+;;; the child snippet.
+;;;
+;;; Unfortunately, this also puts some ugly (and not fully-tested)
+;;; bits of code in `yas/expand-snippet' and
+;;; `yas/commit-snippet'. I've tried to mark them with "stacked
+;;; expansion:".
+;;;
+;;; This was thought to be safer in in an undo/redo perpective, but
+;;; maybe the correct implementation is to make the globals
+;;; `yas/active-field-overlay' and `yas/field-protection-overlays' be
+;;; snippet-local and be active even while the child snippet is
+;;; running. This would mean a lot of overlay modification hooks
+;;; running, but if managed correctly (including overlay priorities)
+;;; they should account for all situations...
+;;;
+
+(defun yas/expand-snippet (template &optional start end expand-env)
+ "Expand snippet at current point. Text between START and END
+will be deleted before inserting template."
+ (run-hooks 'yas/before-expand-snippet-hook)
+
+ ;; If a region is active, set `yas/selected-text'
+ (setq yas/selected-text
+ (when mark-active
+ (prog1 (buffer-substring-no-properties (region-beginning)
+ (region-end))
+ (unless start (setq start (region-beginning))
+ (unless end (setq end (region-end)))))))
+
+ (when start
+ (goto-char start))
+
+ ;; stacked expansion: shoosh the overlay modification hooks
+ ;;
+ (let ((to-delete (and start end (buffer-substring-no-properties start end)))
+ (start (or start (point)))
+ (end (or end (point)))
+ (inhibit-modification-hooks t)
+ (column (current-column))
+ snippet)
+
+ ;; Delete the region to delete, this *does* get undo-recorded.
+ ;;
+ (when (and to-delete
+ (> end start))
+ (delete-region start end)
+ (setq yas/deleted-text to-delete))
+
+ ;; Narrow the region down to the template, shoosh the
+ ;; `buffer-undo-list', and create the snippet, the new snippet
+ ;; updates its mirrors once, so we are left with some plain text.
+ ;; The undo action for deleting this plain text will get recorded
+ ;; at the end of this function.
+ (save-restriction
+ (narrow-to-region start start)
+ (let ((buffer-undo-list t))
+ ;; snippet creation might evaluate users elisp, which
+ ;; might generate errors, so we have to be ready to catch
+ ;; them mostly to make the undo information
+ ;;
+ (setq yas/start-column (save-restriction (widen) (current-column)))
+ (insert template)
+
+ (setq snippet
+ (if expand-env
+ (let ((read-vars (condition-case err
+ (read expand-env)
+ (error nil))))
+ (eval `(let ,read-vars
+ (yas/snippet-create (point-min) (point-max)))))
+ (yas/snippet-create (point-min) (point-max))))))
+
+ ;; stacked-expansion: This checks for stacked expansion, save the
+ ;; `yas/previous-active-field' and advance its boudary.
+ ;;
+ (let ((existing-field (and yas/active-field-overlay
+ (overlay-buffer yas/active-field-overlay)
+ (overlay-get yas/active-field-overlay 'yas/field))))
+ (when existing-field
+ (setf (yas/snippet-previous-active-field snippet) existing-field)
+ (yas/advance-end-maybe existing-field (overlay-end yas/active-field-overlay))))
+
+ ;; Exit the snippet immediately if no fields
+ ;;
+ (unless (yas/snippet-fields snippet)
+ (yas/exit-snippet snippet))
+
+ ;; Push two undo actions: the deletion of the inserted contents of
+ ;; the new snippet (without the "key") followed by an apply of
+ ;; `yas/take-care-of-redo' on the newly inserted snippet boundaries
+ ;;
+ (let ((start (overlay-start (yas/snippet-control-overlay snippet)))
+ (end (overlay-end (yas/snippet-control-overlay snippet))))
+ (push (cons start end) buffer-undo-list)
+ (push `(apply yas/take-care-of-redo ,start ,end ,snippet)
+ buffer-undo-list))
+ ;; Now, move to the first field
+ ;;
+ (let ((first-field (car (yas/snippet-fields snippet))))
+ (when first-field
+ (yas/move-to-field snippet first-field))))
+ (message "[yas] snippet expanded."))
+
+(defun yas/take-care-of-redo (beg end snippet)
+ "Commits SNIPPET, which in turn pushes an undo action for
+reviving it.
+
+Meant to exit in the `buffer-undo-list'."
+ ;; slightly optimize: this action is only needed for snippets with
+ ;; at least one field
+ (when (yas/snippet-fields snippet)
+ (yas/commit-snippet snippet 'no-hooks)))
+
+(defun yas/snippet-revive (beg end snippet)
+ "Revives the SNIPPET and creates a control overlay from BEG to
+END.
+
+BEG and END are, we hope, the original snippets boudaries. All
+the markers/points exiting existing inside SNIPPET should point
+to their correct locations *at the time the snippet is revived*.
+
+After revival, push the `yas/take-care-of-redo' in the
+`buffer-undo-list'"
+ ;; Reconvert all the points to markers
+ ;;
+ (yas/points-to-markers snippet)
+ ;; When at least one editable field existed in the zombie snippet,
+ ;; try to revive the whole thing...
+ ;;
+ (let ((target-field (or (yas/snippet-active-field snippet)
+ (car (yas/snippet-fields snippet)))))
+ (when target-field
+ (setf (yas/snippet-control-overlay snippet) (yas/make-control-overlay snippet beg end))
+ (overlay-put (yas/snippet-control-overlay snippet) 'yas/snippet snippet)
+
+ (yas/move-to-field snippet target-field)
+
+ (add-hook 'post-command-hook 'yas/post-command-handler nil t)
+ (add-hook 'pre-command-hook 'yas/pre-command-handler t t)
+
+ (push `(apply yas/take-care-of-redo ,beg ,end ,snippet)
+ buffer-undo-list))))
+
+(defun yas/snippet-create (begin end)
+ "Creates a snippet from an template inserted between BEGIN and END.
+
+Returns the newly created snippet."
+ (let ((snippet (yas/make-snippet)))
+ (goto-char begin)
+ (yas/snippet-parse-create snippet)
+
+ ;; Sort and link each field
+ (yas/snippet-sort-fields snippet)
+
+ ;; Create keymap overlay for snippet
+ (setf (yas/snippet-control-overlay snippet)
+ (yas/make-control-overlay snippet (point-min) (point-max)))
+
+ ;; Move to end
+ (goto-char (point-max))
+
+ ;; Setup hooks
+ (add-hook 'post-command-hook 'yas/post-command-handler nil t)
+ (add-hook 'pre-command-hook 'yas/pre-command-handler t t)
+
+ snippet))
+
+
+;;; Apropos adjacencies: Once the $-constructs bits like "$n" and
+;;; "${:n" are deleted in the recently expanded snippet, we might
+;;; actually have many fields, mirrors (and the snippet exit) in the
+;;; very same position in the buffer. Therefore we need to single-link
+;;; the fields-or-mirrors-or-exit, which I have called "fom",
+;;; according to their original positions in the buffer.
+;;;
+;;; Then we have operation `yas/advance-end-maybe' and
+;;; `yas/advance-start-maybe', which conditionally push the starts and
+;;; ends of these foms down the chain.
+;;;
+;;; This allows for like the printf with the magic ",":
+;;;
+;;; printf ("${1:%s}\\n"${1:$(if (string-match "%" text) "," "\);")} \
+;;; $2${1:$(if (string-match "%" text) "\);" "")}$0
+;;;
+
+(defun yas/fom-start (fom)
+ (cond ((yas/field-p fom)
+ (yas/field-start fom))
+ ((yas/mirror-p fom)
+ (yas/mirror-start fom))
+ (t
+ (yas/exit-marker fom))))
+
+(defun yas/fom-end (fom)
+ (cond ((yas/field-p fom)
+ (yas/field-end fom))
+ ((yas/mirror-p fom)
+ (yas/mirror-end fom))
+ (t
+ (yas/exit-marker fom))))
+
+(defun yas/fom-next (fom)
+ (cond ((yas/field-p fom)
+ (yas/field-next fom))
+ ((yas/mirror-p fom)
+ (yas/mirror-next fom))
+ (t
+ (yas/exit-next fom))))
+
+(defun yas/calculate-adjacencies (snippet)
+ "Calculate adjacencies for fields or mirrors of SNIPPET.
+
+This is according to their relative positions in the buffer, and
+has to be called before the $-constructs are deleted."
+ (flet ((yas/fom-set-next-fom (fom nextfom)
+ (cond ((yas/field-p fom)
+ (setf (yas/field-next fom) nextfom))
+ ((yas/mirror-p fom)
+ (setf (yas/mirror-next fom) nextfom))
+ (t
+ (setf (yas/exit-next fom) nextfom))))
+ (yas/compare-fom-begs (fom1 fom2)
+ (> (yas/fom-start fom2) (yas/fom-start fom1)))
+ (yas/link-foms (fom1 fom2)
+ (yas/fom-set-next-fom fom1 fom2)))
+ ;; make some yas/field, yas/mirror and yas/exit soup
+ (let ((soup))
+ (when (yas/snippet-exit snippet)
+ (push (yas/snippet-exit snippet) soup))
+ (dolist (field (yas/snippet-fields snippet))
+ (push field soup)
+ (dolist (mirror (yas/field-mirrors field))
+ (push mirror soup)))
+ (setq soup
+ (sort soup
+ #'yas/compare-fom-begs))
+ (when soup
+ (reduce #'yas/link-foms soup)))))
+
+(defun yas/advance-end-maybe (fom newend)
+ "Maybe advance FOM's end to NEWEND if it needs it.
+
+If it does, also:
+
+* call `yas/advance-start-maybe' on FOM's next fom.
+
+* in case FOM is field call `yas/advance-end-maybe' on its parent
+ field"
+ (when (and fom (< (yas/fom-end fom) newend))
+ (set-marker (yas/fom-end fom) newend)
+ (yas/advance-start-maybe (yas/fom-next fom) newend)
+ (if (and (yas/field-p fom)
+ (yas/field-parent-field fom))
+ (yas/advance-end-maybe (yas/field-parent-field fom) newend))))
+
+(defun yas/advance-start-maybe (fom newstart)
+ "Maybe advance FOM's start to NEWSTART if it needs it.
+
+If it does, also call `yas/advance-end-maybe' on FOM."
+ (when (and fom (< (yas/fom-start fom) newstart))
+ (set-marker (yas/fom-start fom) newstart)
+ (yas/advance-end-maybe fom newstart)))
+
+(defvar yas/dollar-regions nil
+ "When expanding the snippet the \"parse-create\" functions add
+ cons cells to this var")
+
+(defun yas/snippet-parse-create (snippet)
+ "Parse a recently inserted snippet template, creating all
+necessary fields, mirrors and exit points.
+
+Meant to be called in a narrowed buffer, does various passes"
+ (let ((parse-start (point)))
+ ;; Reset the yas/dollar-regions
+ ;;
+ (setq yas/dollar-regions nil)
+ ;; protect escaped quote, backquotes and backslashes
+ ;;
+ (yas/protect-escapes nil '(?\\ ?` ?'))
+ ;; replace all backquoted expressions
+ ;;
+ (goto-char parse-start)
+ (yas/replace-backquotes)
+ ;; protect escapes again since previous steps might have generated
+ ;; more characters needing escaping
+ ;;
+ (goto-char parse-start)
+ (yas/protect-escapes)
+ ;; parse fields with {}
+ ;;
+ (goto-char parse-start)
+ (yas/field-parse-create snippet)
+ ;; parse simple mirrors and fields
+ ;;
+ (goto-char parse-start)
+ (yas/simple-mirror-parse-create snippet)
+ ;; parse mirror transforms
+ ;;
+ (goto-char parse-start)
+ (yas/transform-mirror-parse-create snippet)
+ ;; calculate adjacencies of fields and mirrors
+ ;;
+ (yas/calculate-adjacencies snippet)
+ ;; Delete $-constructs
+ ;;
+ (yas/delete-regions yas/dollar-regions)
+ ;; restore escapes
+ ;;
+ (goto-char parse-start)
+ (yas/restore-escapes)
+ ;; update mirrors for the first time
+ ;;
+ (yas/update-mirrors snippet)
+ ;; indent the best we can
+ ;;
+ (goto-char parse-start)
+ (yas/indent snippet)))
+
+(defun yas/indent-according-to-mode (snippet-markers)
+ "Indent current line according to mode, preserving
+SNIPPET-MARKERS."
+ ;; XXX: Here seems to be the indent problem:
+ ;;
+ ;; `indent-according-to-mode' uses whatever
+ ;; `indent-line-function' is available. Some
+ ;; implementations of these functions delete text
+ ;; before they insert. If there happens to be a marker
+ ;; just after the text being deleted, the insertion
+ ;; actually happens after the marker, which misplaces
+ ;; it.
+ ;;
+ ;; This would also happen if we had used overlays with
+ ;; the `front-advance' property set to nil.
+ ;;
+ ;; This is why I have these `trouble-markers', they are the ones at
+ ;; they are the ones at the first non-whitespace char at the line
+ ;; (i.e. at `yas/real-line-beginning'. After indentation takes place
+ ;; we should be at the correct to restore them to. All other
+ ;; non-trouble-markers have been *pushed* and don't need special
+ ;; attention.
+ ;;
+ (goto-char (yas/real-line-beginning))
+ (let ((trouble-markers (remove-if-not #'(lambda (marker)
+ (= marker (point)))
+ snippet-markers)))
+ (save-restriction
+ (widen)
+ (condition-case err
+ (indent-according-to-mode)
+ (error (message "[yas] warning: yas/indent-according-to-mode habing problems running %s" indent-line-function)
+ nil)))
+ (mapc #'(lambda (marker)
+ (set-marker marker (point)))
+ trouble-markers)))
+
+(defun yas/indent (snippet)
+ (let ((snippet-markers (yas/collect-snippet-markers snippet)))
+ ;; Look for those $>
+ (save-excursion
+ (while (re-search-forward "$>" nil t)
+ (delete-region (match-beginning 0) (match-end 0))
+ (when (not (eq yas/indent-line 'auto))
+ (yas/indent-according-to-mode snippet-markers))))
+ ;; Now do stuff for 'fixed and 'auto
+ (save-excursion
+ (cond ((eq yas/indent-line 'fixed)
+ (while (and (zerop (forward-line))
+ (zerop (current-column)))
+ (indent-to-column column)))
+ ((eq yas/indent-line 'auto)
+ (let ((end (set-marker (make-marker) (point-max)))
+ (indent-first-line-p yas/also-auto-indent-first-line))
+ (while (and (zerop (if indent-first-line-p
+ (prog1
+ (forward-line 0)
+ (setq indent-first-line-p nil))
+ (forward-line 1)))
+ (not (eobp))
+ (<= (point) end))
+ (yas/indent-according-to-mode snippet-markers))))
+ (t
+ nil)))))
+
+(defun yas/collect-snippet-markers (snippet)
+ "Make a list of all the markers used by SNIPPET."
+ (let (markers)
+ (dolist (field (yas/snippet-fields snippet))
+ (push (yas/field-start field) markers)
+ (push (yas/field-end field) markers)
+ (dolist (mirror (yas/field-mirrors field))
+ (push (yas/mirror-start mirror) markers)
+ (push (yas/mirror-end mirror) markers)))
+ (let ((snippet-exit (yas/snippet-exit snippet)))
+ (when (and snippet-exit
+ (marker-buffer (yas/exit-marker snippet-exit)))
+ (push (yas/exit-marker snippet-exit) markers)))
+ markers))
+
+(defun yas/real-line-beginning ()
+ (let ((c (char-after (line-beginning-position)))
+ (n (line-beginning-position)))
+ (while (or (eql c ?\ )
+ (eql c ?\t))
+ (incf n)
+ (setq c (char-after n)))
+ n))
+
+(defun yas/escape-string (escaped)
+ (concat "YASESCAPE" (format "%d" escaped) "PROTECTGUARD"))
+
+(defun yas/protect-escapes (&optional text escaped)
+ "Protect all escaped characters with their numeric ASCII value.
+
+With optional string TEXT do it in string instead of buffer."
+ (let ((changed-text text)
+ (text-provided-p text))
+ (mapc #'(lambda (escaped)
+ (setq changed-text
+ (yas/replace-all (concat "\\" (char-to-string escaped))
+ (yas/escape-string escaped)
+ (when text-provided-p changed-text))))
+ (or escaped yas/escaped-characters))
+ changed-text))
+
+(defun yas/restore-escapes (&optional text escaped)
+ "Restore all escaped characters from their numeric ASCII value.
+
+With optional string TEXT do it in string instead of the buffer."
+ (let ((changed-text text)
+ (text-provided-p text))
+ (mapc #'(lambda (escaped)
+ (setq changed-text
+ (yas/replace-all (yas/escape-string escaped)
+ (char-to-string escaped)
+ (when text-provided-p changed-text))))
+ (or escaped yas/escaped-characters))
+ changed-text))
+
+(defun yas/replace-backquotes ()
+ "Replace all the \"`(lisp-expression)`\"-style expression
+ with their evaluated value"
+ (while (re-search-forward yas/backquote-lisp-expression-regexp nil t)
+ (let ((transformed (yas/read-and-eval-string (yas/restore-escapes (match-string 1)))))
+ (goto-char (match-end 0))
+ (when transformed (insert transformed))
+ (delete-region (match-beginning 0) (match-end 0)))))
+
+(defun yas/scan-sexps (from count)
+ (condition-case err
+ (with-syntax-table (standard-syntax-table)
+ (scan-sexps from count))
+ (error
+ nil)))
+
+(defun yas/make-marker (pos)
+ "Create a marker at POS with `nil' `marker-insertion-type'"
+ (let ((marker (set-marker (make-marker) pos)))
+ (set-marker-insertion-type marker nil)
+ marker))
+
+(defun yas/field-parse-create (snippet &optional parent-field)
+ "Parse most field expressions, except for the simple one \"$n\".
+
+The following count as a field:
+
+* \"${n: text}\", for a numbered field with default text, as long as N is not 0;
+
+* \"${n: text$(expression)}, the same with a lisp expression;
+ this is caught with the curiously named `yas/multi-dollar-lisp-expression-regexp'
+
+* the same as above but unnumbered, (no N:) and number is calculated automatically.
+
+When multiple expressions are found, only the last one counts."
+ ;;
+ (save-excursion
+ (while (re-search-forward yas/field-regexp nil t)
+ (let* ((real-match-end-0 (yas/scan-sexps (1+ (match-beginning 0)) 1))
+ (number (and (match-string-no-properties 1)
+ (string-to-number (match-string-no-properties 1))))
+ (brand-new-field (and real-match-end-0
+ ;; break if on "$(" immediately
+ ;; after the ":", this will be
+ ;; caught as a mirror with
+ ;; transform later.
+ (not (save-match-data
+ (eq (string-match "$[ \t\n]*("
+ (match-string-no-properties 2)) 0)))
+ (not (and number (zerop number)))
+ (yas/make-field number
+ (yas/make-marker (match-beginning 2))
+ (yas/make-marker (1- real-match-end-0))
+ parent-field))))
+ (when brand-new-field
+ (goto-char real-match-end-0)
+ (push (cons (1- real-match-end-0) real-match-end-0)
+ yas/dollar-regions)
+ (push (cons (match-beginning 0) (match-beginning 2))
+ yas/dollar-regions)
+ (push brand-new-field (yas/snippet-fields snippet))
+ (save-excursion
+ (save-restriction
+ (narrow-to-region (yas/field-start brand-new-field) (yas/field-end brand-new-field))
+ (goto-char (point-min))
+ (yas/field-parse-create snippet brand-new-field)))))))
+ ;; if we entered from a parent field, now search for the
+ ;; `yas/multi-dollar-lisp-expression-regexp'. THis is used for
+ ;; primary field transformations
+ ;;
+ (when parent-field
+ (save-excursion
+ (while (re-search-forward yas/multi-dollar-lisp-expression-regexp nil t)
+ (let* ((real-match-end-1 (yas/scan-sexps (match-beginning 1) 1)))
+ ;; commit the primary field transformation if we don't find
+ ;; it in yas/dollar-regions (a subnested field) might have
+ ;; already caught it.
+ (when (and real-match-end-1
+ (not (member (cons (match-beginning 0)
+ real-match-end-1)
+ yas/dollar-regions)))
+ (let ((lisp-expression-string (buffer-substring-no-properties (match-beginning 1)
+ real-match-end-1)))
+ (setf (yas/field-transform parent-field) (yas/restore-escapes lisp-expression-string)))
+ (push (cons (match-beginning 0) real-match-end-1)
+ yas/dollar-regions)))))))
+
+(defun yas/transform-mirror-parse-create (snippet)
+ "Parse the \"${n:$(lisp-expression)}\" mirror transformations."
+ (while (re-search-forward yas/transform-mirror-regexp nil t)
+ (let* ((real-match-end-0 (yas/scan-sexps (1+ (match-beginning 0)) 1))
+ (number (string-to-number (match-string-no-properties 1)))
+ (field (and number
+ (not (zerop number))
+ (yas/snippet-find-field snippet number))))
+ (when (and real-match-end-0
+ field)
+ (push (yas/make-mirror (yas/make-marker (match-beginning 0))
+ (yas/make-marker (match-beginning 0))
+ (yas/restore-escapes
+ (buffer-substring-no-properties (match-beginning 2)
+ (1- real-match-end-0))))
+ (yas/field-mirrors field))
+ (push (cons (match-beginning 0) real-match-end-0) yas/dollar-regions)))))
+
+(defun yas/simple-mirror-parse-create (snippet)
+ "Parse the simple \"$n\" mirrors and the exit-marker."
+ (while (re-search-forward yas/simple-mirror-regexp nil t)
+ (let ((number (string-to-number (match-string-no-properties 1))))
+ (cond ((zerop number)
+
+ (setf (yas/snippet-exit snippet)
+ (yas/make-exit (yas/make-marker (match-end 0))))
+ (save-excursion
+ (goto-char (match-beginning 0))
+ (when yas/wrap-around-region
+ (cond (yas/selected-text
+ (insert yas/selected-text))
+ ((and (eq yas/wrap-around-region 'cua)
+ cua-mode
+ (get-register ?0))
+ (insert (prog1 (get-register ?0)
+ (set-register ?0 nil))))))
+ (push (cons (point) (yas/exit-marker (yas/snippet-exit snippet)))
+ yas/dollar-regions)))
+ (t
+ (let ((field (yas/snippet-find-field snippet number)))
+ (if field
+ (push (yas/make-mirror (yas/make-marker (match-beginning 0))
+ (yas/make-marker (match-beginning 0))
+ nil)
+ (yas/field-mirrors field))
+ (push (yas/make-field number
+ (yas/make-marker (match-beginning 0))
+ (yas/make-marker (match-beginning 0))
+ nil)
+ (yas/snippet-fields snippet))))
+ (push (cons (match-beginning 0) (match-end 0))
+ yas/dollar-regions))))))
+
+(defun yas/delete-regions (regions)
+ "Sort disjuct REGIONS by start point, then delete from the back."
+ (mapc #'(lambda (reg)
+ (delete-region (car reg) (cdr reg)))
+ (sort regions
+ #'(lambda (r1 r2)
+ (>= (car r1) (car r2))))))
+
+(defun yas/update-mirrors (snippet)
+ "Updates all the mirrors of SNIPPET."
+ (save-excursion
+ (dolist (field (yas/snippet-fields snippet))
+ (dolist (mirror (yas/field-mirrors field))
+ ;; stacked expansion: I added an `inhibit-modification-hooks'
+ ;; here, for safety, may need to remove if we the mechanism is
+ ;; altered.
+ ;;
+ (let ((inhibit-modification-hooks t))
+ (yas/mirror-update-display mirror field)
+ ;; `yas/place-overlays' is needed if the active field and
+ ;; protected overlays have been changed because of insertions
+ ;; in `yas/mirror-update-display'
+ ;;
+ (when (eq field (yas/snippet-active-field snippet))
+ (yas/place-overlays snippet field)))))))
+
+(defun yas/mirror-update-display (mirror field)
+ "Update MIRROR according to FIELD (and mirror transform)."
+ (let ((reflection (or (yas/apply-transform mirror field)
+ (yas/field-text-for-display field))))
+ (when (and reflection
+ (not (string= reflection (buffer-substring-no-properties (yas/mirror-start mirror)
+ (yas/mirror-end mirror)))))
+ (goto-char (yas/mirror-start mirror))
+ (insert reflection)
+ (if (> (yas/mirror-end mirror) (point))
+ (delete-region (point) (yas/mirror-end mirror))
+ (set-marker (yas/mirror-end mirror) (point))
+ (yas/advance-start-maybe (yas/mirror-next mirror) (point))))))
+
+(defun yas/field-update-display (field snippet)
+ "Much like `yas/mirror-update-display', but for fields"
+ (when (yas/field-transform field)
+ (let ((inhibit-modification-hooks t)
+ (transformed (yas/apply-transform field field))
+ (point (point)))
+ (when (and transformed
+ (not (string= transformed (buffer-substring-no-properties (yas/field-start field)
+ (yas/field-end field)))))
+ (setf (yas/field-modified-p field) t)
+ (goto-char (yas/field-start field))
+ (insert transformed)
+ (if (> (yas/field-end field) (point))
+ (delete-region (point) (yas/field-end field))
+ (set-marker (yas/field-end field) (point))
+ (yas/advance-start-maybe (yas/field-next field) (point)))
+ t))))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Pre- and post-command hooks
+;;
+(defun yas/pre-command-handler () )
+
+(defun yas/post-command-handler ()
+ "Handles various yasnippet conditions after each command."
+ (cond (yas/protection-violation
+ (goto-char yas/protection-violation)
+ (setq yas/protection-violation nil))
+ ((eq 'undo this-command)
+ ;;
+ ;; After undo revival the correct field is sometimes not
+ ;; restored correctly, this condition handles that
+ ;;
+ (let* ((snippet (car (yas/snippets-at-point)))
+ (target-field (and snippet
+ (find-if-not #'(lambda (field)
+ (yas/field-probably-deleted-p snippet field))
+ (remove nil
+ (cons (yas/snippet-active-field snippet)
+ (yas/snippet-fields snippet)))))))
+ (when target-field
+ (yas/move-to-field snippet target-field))))
+ ((not (yas/undo-in-progress))
+ ;; When not in an undo, check if we must commit the snippet (use exited it).
+ (yas/check-commit-snippet))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Debug functions. Use (or change) at will whenever needed.
+;;
+;; some useful debug code for looking up snippet tables
+;;
+;; (insert (pp
+;; (let ((shit))
+;; (maphash #'(lambda (k v)
+;; (push k shit))
+;; (yas/snippet-table-hash (gethash 'ruby-mode yas/snippet-tables)))
+;; shit)))
+;;
+
+(defun yas/debug-tables ()
+ (interactive)
+ (with-output-to-temp-buffer "*YASnippet tables*"
+ (dolist (symbol (remove nil (append (list major-mode)
+ (if (listp yas/mode-symbol)
+ yas/mode-symbol
+ (list yas/mode-symbol)))))
+ (princ (format "Snippet table hash keys for %s:\n\n" symbol))
+ (let ((keys))
+ (maphash #'(lambda (k v)
+ (push k keys))
+ (yas/snippet-table-hash (gethash symbol yas/snippet-tables)))
+ (princ keys))
+
+ (princ (format "Keymap for %s:\n\n" symbol))
+ (princ (gethash symbol yas/menu-table)))))
+
+(defun yas/debug-snippet-vars ()
+ "Debug snippets, fields, mirrors and the `buffer-undo-list'."
+ (interactive)
+ (with-output-to-temp-buffer "*YASnippet trace*"
+ (princ "Interesting YASnippet vars: \n\n")
+
+ (princ (format "\nPost command hook: %s\n" post-command-hook))
+ (princ (format "\nPre command hook: %s\n" pre-command-hook))
+
+ (princ (format "%s live snippets in total\n" (length (yas/snippets-at-point (quote all-snippets)))))
+ (princ (format "%s overlays in buffer:\n\n" (length (overlays-in (point-min) (point-max)))))
+ (princ (format "%s live snippets at point:\n\n" (length (yas/snippets-at-point))))
+
+
+ (dolist (snippet (yas/snippets-at-point))
+ (princ (format "\tsid: %d control overlay from %d to %d\n"
+ (yas/snippet-id snippet)
+ (overlay-start (yas/snippet-control-overlay snippet))
+ (overlay-end (yas/snippet-control-overlay snippet))))
+ (princ (format "\tactive field: %d from %s to %s covering \"%s\"\n"
+ (yas/field-number (yas/snippet-active-field snippet))
+ (marker-position (yas/field-start (yas/snippet-active-field snippet)))
+ (marker-position (yas/field-end (yas/snippet-active-field snippet)))
+ (buffer-substring-no-properties (yas/field-start (yas/snippet-active-field snippet)) (yas/field-end (yas/snippet-active-field snippet)))))
+ (when (yas/snippet-exit snippet)
+ (princ (format "\tsnippet-exit: at %s next: %s\n"
+ (yas/exit-marker (yas/snippet-exit snippet))
+ (yas/exit-next (yas/snippet-exit snippet)))))
+ (dolist (field (yas/snippet-fields snippet))
+ (princ (format "\tfield: %d from %s to %s covering \"%s\" next: %s\n"
+ (yas/field-number field)
+ (marker-position (yas/field-start field))
+ (marker-position (yas/field-end field))
+ (buffer-substring-no-properties (yas/field-start field) (yas/field-end field))
+ (yas/debug-format-fom-concise (yas/field-next field))))
+ (dolist (mirror (yas/field-mirrors field))
+ (princ (format "\t\tmirror: from %s to %s covering \"%s\" next: %s\n"
+ (marker-position (yas/mirror-start mirror))
+ (marker-position (yas/mirror-end mirror))
+ (buffer-substring-no-properties (yas/mirror-start mirror) (yas/mirror-end mirror))
+ (yas/debug-format-fom-concise (yas/mirror-next mirror)))))))
+
+ (princ (format "\nUndo is %s and point-max is %s.\n"
+ (if (eq buffer-undo-list t)
+ "DISABLED"
+ "ENABLED")
+ (point-max)))
+ (unless (eq buffer-undo-list t)
+ (princ (format "Undpolist has %s elements. First 10 elements follow:\n" (length buffer-undo-list)))
+ (let ((first-ten (subseq buffer-undo-list 0 19)))
+ (dolist (undo-elem first-ten)
+ (princ (format "%2s: %s\n" (position undo-elem first-ten) (truncate-string-to-width (format "%s" undo-elem) 70))))))))
+
+(defun yas/debug-format-fom-concise (fom)
+ (when fom
+ (cond ((yas/field-p fom)
+ (format "field %d from %d to %d"
+ (yas/field-number fom)
+ (marker-position (yas/field-start fom))
+ (marker-position (yas/field-end fom))))
+ ((yas/mirror-p fom)
+ (format "mirror from %d to %d"
+ (marker-position (yas/mirror-start fom))
+ (marker-position (yas/mirror-end fom))))
+ (t
+ (format "snippet exit at %d"
+ (marker-position (yas/fom-start fom)))))))
+
+
+(defun yas/exterminate-package ()
+ (interactive)
+ (yas/global-mode -1)
+ (yas/minor-mode -1)
+ (yas/kill-snippet-keybindings)
+ (mapatoms #'(lambda (atom)
+ (when (string-match "yas/" (symbol-name atom))
+ (unintern atom)))))
+
+(defun yas/debug-test (&optional quiet)
+ (interactive "P")
+ (yas/load-directory (or (and (listp yas/root-directory)
+ (first yas/root-directory))
+ yas/root-directory
+ "~/Source/yasnippet/snippets/"))
+ (set-buffer (switch-to-buffer "*YAS TEST*"))
+ (mapc #'yas/commit-snippet (yas/snippets-at-point 'all-snippets))
+ (erase-buffer)
+ (setq buffer-undo-list nil)
+ (setq undo-in-progress nil)
+ (snippet-mode)
+ (yas/minor-mode 1)
+ (let ((abbrev))
+ (setq abbrev "$f")
+ (insert abbrev))
+ (unless quiet
+ (add-hook 'post-command-hook 'yas/debug-snippet-vars 't 'local)))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; `locate-dominating-file' is added for compatibility in emacs < 23
+(unless (or (eq emacs-major-version 23)
+ (fboundp 'locate-dominating-file))
+ (defvar locate-dominating-stop-dir-regexp
+ "\\`\\(?:[\\/][\\/][^\\/]+[\\/]\\|/\\(?:net\\|afs\\|\\.\\.\\.\\)/\\)\\'"
+ "Regexp of directory names which stop the search in `locate-dominating-file'.
+Any directory whose name matches this regexp will be treated like
+a kind of root directory by `locate-dominating-file' which will stop its search
+when it bumps into it.
+The default regexp prevents fruitless and time-consuming attempts to find
+special files in directories in which filenames are interpreted as hostnames,
+or mount points potentially requiring authentication as a different user.")
+
+ (defun locate-dominating-file (file name)
+ "Look up the directory hierarchy from FILE for a file named NAME.
+Stop at the first parent directory containing a file NAME,
+and return the directory. Return nil if not found."
+ ;; We used to use the above locate-dominating-files code, but the
+ ;; directory-files call is very costly, so we're much better off doing
+ ;; multiple calls using the code in here.
+ ;;
+ ;; Represent /home/luser/foo as ~/foo so that we don't try to look for
+ ;; `name' in /home or in /.
+ (setq file (abbreviate-file-name file))
+ (let ((root nil)
+ (prev-file file)
+ ;; `user' is not initialized outside the loop because
+ ;; `file' may not exist, so we may have to walk up part of the
+ ;; hierarchy before we find the "initial UID".
+ (user nil)
+ try)
+ (while (not (or root
+ (null file)
+ ;; FIXME: Disabled this heuristic because it is sometimes
+ ;; inappropriate.
+ ;; As a heuristic, we stop looking up the hierarchy of
+ ;; directories as soon as we find a directory belonging
+ ;; to another user. This should save us from looking in
+ ;; things like /net and /afs. This assumes that all the
+ ;; files inside a project belong to the same user.
+ ;; (let ((prev-user user))
+ ;; (setq user (nth 2 (file-attributes file)))
+ ;; (and prev-user (not (equal user prev-user))))
+ (string-match locate-dominating-stop-dir-regexp file)))
+ (setq try (file-exists-p (expand-file-name name file)))
+ (cond (try (setq root file))
+ ((equal file (setq prev-file file
+ file (file-name-directory
+ (directory-file-name file))))
+ (setq file nil))))
+ root)))
+
+(provide 'yasnippet)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Monkey patching for other functions that's causing
+;; problems to yasnippet. For details on why I patch
+;; those functions, refer to
+;; http://code.google.com/p/yasnippet/wiki/MonkeyPatching
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(defadvice c-neutralize-syntax-in-CPP
+ (around yas-mp/c-neutralize-syntax-in-CPP activate)
+ "Adviced `c-neutralize-syntax-in-CPP' to properly
+handle the end-of-buffer error fired in it by calling
+`forward-char' at the end of buffer."
+ (condition-case err
+ ad-do-it
+ (error (message (error-message-string err)))))
+
+;; disable c-electric-* serial command in YAS fields
+(add-hook 'c-mode-common-hook
+ '(lambda ()
+ (dolist (k '(":" ">" ";" "<" "{" "}"))
+ (define-key (symbol-value (make-local-variable 'yas/keymap))
+ k 'self-insert-command))))
+
+
+;;; yasnippet.el ends here