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+;;; company-yasnippet.el --- company-mode completion backend for Yasnippet
+
+;; Copyright (C) 2014, 2015  Free Software Foundation, Inc.
+
+;; Author: Dmitry Gutov
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs 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.  If not, see <http://www.gnu.org/licenses/>.
+
+
+;;; Commentary:
+;;
+
+;;; Code:
+
+(require 'company)
+(require 'cl-lib)
+
+(declare-function yas--table-hash "yasnippet")
+(declare-function yas--get-snippet-tables "yasnippet")
+(declare-function yas-expand-snippet "yasnippet")
+(declare-function yas--template-content "yasnippet")
+(declare-function yas--template-expand-env "yasnippet")
+(declare-function yas--warning "yasnippet")
+
+(defun company-yasnippet--key-prefixes ()
+  ;; Mostly copied from `yas--templates-for-key-at-point'.
+  (defvar yas-key-syntaxes)
+  (save-excursion
+    (let ((original (point))
+          (methods yas-key-syntaxes)
+          prefixes
+          method)
+      (while methods
+        (unless (eq method (car methods))
+          (goto-char original))
+        (setq method (car methods))
+        (cond ((stringp method)
+               (skip-syntax-backward method)
+               (setq methods (cdr methods)))
+              ((functionp method)
+               (unless (eq (funcall method original)
+                           'again)
+                 (setq methods (cdr methods))))
+              (t
+               (setq methods (cdr methods))
+               (yas--warning "Invalid element `%s' in `yas-key-syntaxes'" method)))
+        (let ((prefix (buffer-substring-no-properties (point) original)))
+          (unless (equal prefix (car prefixes))
+            (push prefix prefixes))))
+      prefixes)))
+
+(defun company-yasnippet--candidates (prefix)
+  ;; Process the prefixes in reverse: unlike Yasnippet, we look for prefix
+  ;; matches, so the longest prefix with any matches should be the most useful.
+  (cl-loop with tables = (yas--get-snippet-tables)
+           for key-prefix in (company-yasnippet--key-prefixes)
+           ;; Only consider keys at least as long as the symbol at point.
+           when (>= (length key-prefix) (length prefix))
+           thereis (company-yasnippet--completions-for-prefix prefix
+                                                              key-prefix
+                                                              tables)))
+
+(defun company-yasnippet--completions-for-prefix (prefix key-prefix tables)
+  (cl-mapcan
+   (lambda (table)
+     (let ((keyhash (yas--table-hash table))
+           res)
+       (when keyhash
+         (maphash
+          (lambda (key value)
+            (when (and (stringp key)
+                       (string-prefix-p key-prefix key))
+              (maphash
+               (lambda (name template)
+                 (push
+                  (propertize key
+                              'yas-annotation name
+                              'yas-template template
+                              'yas-prefix-offset (- (length key-prefix)
+                                                    (length prefix)))
+                  res))
+               value)))
+          keyhash))
+       res))
+   tables))
+
+;;;###autoload
+(defun company-yasnippet (command &optional arg &rest ignore)
+  "`company-mode' backend for `yasnippet'.
+
+This backend should be used with care, because as long as there are
+snippets defined for the current major mode, this backend will always
+shadow backends that come after it.  Recommended usages:
+
+* In a buffer-local value of `company-backends', grouped with a backend or
+  several that provide actual text completions.
+
+  (add-hook 'js-mode-hook
+            (lambda ()
+              (set (make-local-variable 'company-backends)
+                   '((company-dabbrev-code company-yasnippet)))))
+
+* After keyword `:with', grouped with other backends.
+
+  (push '(company-semantic :with company-yasnippet) company-backends)
+
+* Not in `company-backends', just bound to a key.
+
+  (global-set-key (kbd \"C-c y\") 'company-yasnippet)
+"
+  (interactive (list 'interactive))
+  (cl-case command
+    (interactive (company-begin-backend 'company-yasnippet))
+    (prefix
+     ;; Should probably use `yas--current-key', but that's bound to be slower.
+     ;; How many trigger keys start with non-symbol characters anyway?
+     (and (bound-and-true-p yas-minor-mode)
+          (company-grab-symbol)))
+    (annotation
+     (concat
+      (unless company-tooltip-align-annotations " -> ")
+      (get-text-property 0 'yas-annotation arg)))
+    (candidates (company-yasnippet--candidates arg))
+    (no-cache t)
+    (post-completion
+     (let ((template (get-text-property 0 'yas-template arg))
+           (prefix-offset (get-text-property 0 'yas-prefix-offset arg)))
+       (yas-expand-snippet (yas--template-content template)
+                           (- (point) (length arg) prefix-offset)
+                           (point)
+                           (yas--template-expand-env template))))))
+
+(provide 'company-yasnippet)
+;;; company-yasnippet.el ends here