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Diffstat (limited to 'emacs.d/elpa/company-20201014.2251/company-capf.el')
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1 files changed, 208 insertions, 0 deletions
diff --git a/emacs.d/elpa/company-20201014.2251/company-capf.el b/emacs.d/elpa/company-20201014.2251/company-capf.el new file mode 100644 index 0000000..cb30a80 --- /dev/null +++ b/emacs.d/elpa/company-20201014.2251/company-capf.el @@ -0,0 +1,208 @@ +;;; company-capf.el --- company-mode completion-at-point-functions backend -*- lexical-binding: t -*- + +;; Copyright (C) 2013-2019 Free Software Foundation, Inc. + +;; Author: Stefan Monnier <monnier@iro.umontreal.ca> + +;; 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: +;; +;; The CAPF back-end provides a bridge to the standard +;; completion-at-point-functions facility, and thus can support any major mode +;; that defines a proper completion function, including emacs-lisp-mode, +;; css-mode and nxml-mode. + +;;; Code: + +(require 'company) +(require 'cl-lib) + +;; Amortizes several calls to a c-a-p-f from the same position. +(defvar company--capf-cache nil) + +;; FIXME: Provide a way to save this info once in Company itself +;; (https://github.com/company-mode/company-mode/pull/845). +(defvar-local company-capf--current-completion-data nil + "Value last returned by `company-capf' when called with `candidates'. +For most properties/actions, this is just what we need: the exact values +that accompanied the completion table that's currently is use. + +`company-capf', however, could be called at some different positions during +a completion session (most importantly, by `company-sort-by-occurrence'), +so we can't just use the preceding variable instead.") + +(defun company--capf-data () + (let ((cache company--capf-cache)) + (if (and (equal (current-buffer) (car cache)) + (equal (point) (car (setq cache (cdr cache)))) + (equal (buffer-chars-modified-tick) (car (setq cache (cdr cache))))) + (cadr cache) + (let ((data (company--capf-data-real))) + (setq company--capf-cache + (list (current-buffer) (point) (buffer-chars-modified-tick) data)) + data)))) + +(defun company--capf-data-real () + (cl-letf* (((default-value 'completion-at-point-functions) + ;; Ignore tags-completion-at-point-function because it subverts + ;; company-etags in the default value of company-backends, where + ;; the latter comes later. + (remove 'tags-completion-at-point-function + (default-value 'completion-at-point-functions))) + (completion-at-point-functions (company--capf-workaround)) + (data (run-hook-wrapped 'completion-at-point-functions + ;; Ignore misbehaving functions. + #'completion--capf-wrapper 'optimist))) + (when (and (consp (cdr data)) (integer-or-marker-p (nth 1 data))) data))) + +(declare-function python-shell-get-process "python") + +(defun company--capf-workaround () + ;; For http://debbugs.gnu.org/cgi/bugreport.cgi?bug=18067 + (if (or (not (listp completion-at-point-functions)) + (not (memq 'python-completion-complete-at-point completion-at-point-functions)) + (python-shell-get-process)) + completion-at-point-functions + (remq 'python-completion-complete-at-point completion-at-point-functions))) + +(defun company-capf--save-current-data (data) + (setq company-capf--current-completion-data data) + (add-hook 'company-after-completion-hook + #'company-capf--clear-current-data nil t)) + +(defun company-capf--clear-current-data (_ignored) + (setq company-capf--current-completion-data nil)) + +(defvar-local company-capf--sorted nil) + +(defun company-capf (command &optional arg &rest _args) + "`company-mode' backend using `completion-at-point-functions'." + (interactive (list 'interactive)) + (pcase command + (`interactive (company-begin-backend 'company-capf)) + (`prefix + (let ((res (company--capf-data))) + (when res + (let ((length (plist-get (nthcdr 4 res) :company-prefix-length)) + (prefix (buffer-substring-no-properties (nth 1 res) (point)))) + (cond + ((> (nth 2 res) (point)) 'stop) + (length (cons prefix length)) + (t prefix)))))) + (`candidates + (company-capf--candidates arg)) + (`sorted + company-capf--sorted) + (`match + ;; Ask the for the `:company-match' function. If that doesn't help, + ;; fallback to sniffing for face changes to get a suitable value. + (let ((f (plist-get (nthcdr 4 company-capf--current-completion-data) + :company-match))) + (if f (funcall f arg) + (let* ((match-start nil) (pos -1) + (prop-value nil) (faces nil) + (has-face-p nil) chunks + (limit (length arg))) + (while (< pos limit) + (setq pos + (if (< pos 0) 0 (next-property-change pos arg limit))) + (setq prop-value (or + (get-text-property pos 'face arg) + (get-text-property pos 'font-lock-face arg)) + faces (if (listp prop-value) prop-value (list prop-value)) + has-face-p (memq 'completions-common-part faces)) + (cond ((and (not match-start) has-face-p) + (setq match-start pos)) + ((and match-start (not has-face-p)) + (push (cons match-start pos) chunks) + (setq match-start nil)))) + (nreverse chunks))))) + (`duplicates t) + (`no-cache t) ;Not much can be done here, as long as we handle + ;non-prefix matches. + (`meta + (let ((f (plist-get (nthcdr 4 company-capf--current-completion-data) + :company-docsig))) + (when f (funcall f arg)))) + (`doc-buffer + (let ((f (plist-get (nthcdr 4 company-capf--current-completion-data) + :company-doc-buffer))) + (when f (funcall f arg)))) + (`location + (let ((f (plist-get (nthcdr 4 company-capf--current-completion-data) + :company-location))) + (when f (funcall f arg)))) + (`annotation + (let ((f (plist-get (nthcdr 4 company-capf--current-completion-data) + :annotation-function))) + (when f (funcall f arg)))) + (`require-match + (plist-get (nthcdr 4 (company--capf-data)) :company-require-match)) + (`init nil) ;Don't bother: plenty of other ways to initialize the code. + (`post-completion + (company--capf-post-completion arg)) + )) + +(defun company-capf--candidates (input) + (let ((res (company--capf-data))) + (company-capf--save-current-data res) + (when res + (let* ((table (nth 3 res)) + (pred (plist-get (nthcdr 4 res) :predicate)) + (meta (completion-metadata + (buffer-substring (nth 1 res) (nth 2 res)) + table pred)) + (candidates (completion-all-completions input table pred + (length input) + meta)) + (sortfun (cdr (assq 'display-sort-function meta))) + (last (last candidates)) + (base-size (and (numberp (cdr last)) (cdr last)))) + (when base-size + (setcdr last nil)) + (setq company-capf--sorted (functionp sortfun)) + (when sortfun + (setq candidates (funcall sortfun candidates))) + (if (not (zerop (or base-size 0))) + (let ((before (substring input 0 base-size))) + (mapcar (lambda (candidate) + (concat before candidate)) + candidates)) + candidates))))) + +(defun company--capf-post-completion (arg) + (let* ((res company-capf--current-completion-data) + (exit-function (plist-get (nthcdr 4 res) :exit-function)) + (table (nth 3 res))) + (if exit-function + ;; We can more or less know when the user is done with completion, + ;; so we do something different than `completion--done'. + (funcall exit-function arg + ;; FIXME: Should probably use an additional heuristic: + ;; completion-at-point doesn't know when the user picked a + ;; particular candidate explicitly (it only checks whether + ;; further completions exist). Whereas company user can press + ;; RET (or use implicit completion with company-tng). + (if (= (car (completion-boundaries arg table nil "")) + (length arg)) + 'sole + 'finished))))) + +(provide 'company-capf) + +;;; company-capf.el ends here |