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