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;;; company-template.el --- utility library for template expansion
;; Copyright (C) 2009, 2010, 2014-2017 Free Software Foundation, Inc.
;; Author: Nikolaj Schumacher
;; 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/>.
;;; Code:
(require 'cl-lib)
(defface company-template-field
'((((background dark)) (:background "yellow" :foreground "black"))
(((background light)) (:background "orange" :foreground "black")))
"Face used for editable text in template fields."
:group 'company-faces)
(defvar company-template-forward-field-item
'(menu-item "" company-template-forward-field
:filter company-template--keymap-filter))
(defvar company-template-nav-map
(let ((keymap (make-sparse-keymap)))
(define-key keymap [tab] company-template-forward-field-item)
(define-key keymap (kbd "TAB") company-template-forward-field-item)
keymap))
(defvar company-template-clear-field-item
'(menu-item "" company-template-clear-field
:filter company-template--keymap-filter))
(defvar company-template-field-map
(let ((keymap (make-sparse-keymap)))
(set-keymap-parent keymap company-template-nav-map)
(define-key keymap (kbd "C-d") company-template-clear-field-item)
keymap))
(defvar-local company-template--buffer-templates nil)
;; interactive ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun company-template-templates-at (pos)
(let (os)
(dolist (o (overlays-at pos))
;; FIXME: Always return the whole list of templates?
;; We remove templates not at point after every command.
(when (memq o company-template--buffer-templates)
(push o os)))
os))
(defun company-template-move-to-first (templ)
(interactive)
(goto-char (overlay-start templ))
(company-template-forward-field))
(defun company-template-forward-field ()
(interactive)
(let ((start (point))
(next-field-start (company-template-find-next-field)))
(push-mark)
(goto-char next-field-start)
(company-template-remove-field (company-template-field-at start))))
(defun company-template-clear-field ()
"Clear the field at point."
(interactive)
(let ((ovl (company-template-field-at (point))))
(when ovl
(company-template-remove-field ovl t)
(let ((after-clear-fn
(overlay-get ovl 'company-template-after-clear)))
(when (functionp after-clear-fn)
(funcall after-clear-fn))))))
(defun company-template--keymap-filter (cmd)
(unless (run-hook-with-args-until-success 'yas-keymap-disable-hook)
cmd))
(defun company-template--after-clear-c-like-field ()
"Function that can be called after deleting a field of a c-like template.
For c-like templates it is set as `after-post-fn' property on fields in
`company-template-add-field'. If there is a next field, delete everything
from point to it. If there is no field after point, remove preceding comma
if present."
(let* ((pos (point))
(next-field-start (company-template-find-next-field))
(last-field-p (not (company-template-field-at next-field-start))))
(cond ((and (not last-field-p)
(< pos next-field-start)
(string-match "^[ ]*,+[ ]*$" (buffer-substring-no-properties
pos next-field-start)))
(delete-region pos next-field-start))
((and last-field-p
(looking-back ",+[ ]*" (line-beginning-position)))
(delete-region (match-beginning 0) pos)))))
(defun company-template-find-next-field ()
(let* ((start (point))
(templates (company-template-templates-at start))
(minimum (apply 'max (mapcar 'overlay-end templates)))
(fields (cl-loop for templ in templates
append (overlay-get templ 'company-template-fields))))
(dolist (pos (mapcar 'overlay-start fields) minimum)
(and pos
(> pos start)
(< pos minimum)
(setq minimum pos)))))
(defun company-template-field-at (&optional point)
(cl-loop for ovl in (overlays-at (or point (point)))
when (overlay-get ovl 'company-template-parent)
return ovl))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun company-template-declare-template (beg end)
(let ((ov (make-overlay beg end)))
;; (overlay-put ov 'face 'highlight)
(overlay-put ov 'keymap company-template-nav-map)
(overlay-put ov 'priority 101)
(overlay-put ov 'evaporate t)
(push ov company-template--buffer-templates)
(add-hook 'post-command-hook 'company-template-post-command nil t)
ov))
(defun company-template-remove-template (templ)
(mapc 'company-template-remove-field
(overlay-get templ 'company-template-fields))
(setq company-template--buffer-templates
(delq templ company-template--buffer-templates))
(delete-overlay templ))
(defun company-template-add-field (templ beg end &optional display after-clear-fn)
"Add new field to template TEMPL spanning from BEG to END.
When DISPLAY is non-nil, set the respective property on the overlay.
Leave point at the end of the field.
AFTER-CLEAR-FN is a function that can be used to apply custom behavior
after deleting a field in `company-template-remove-field'."
(cl-assert templ)
(when (> end (overlay-end templ))
(move-overlay templ (overlay-start templ) end))
(let ((ov (make-overlay beg end))
(siblings (overlay-get templ 'company-template-fields)))
;; (overlay-put ov 'evaporate t)
(overlay-put ov 'intangible t)
(overlay-put ov 'face 'company-template-field)
(when display
(overlay-put ov 'display display))
(overlay-put ov 'company-template-parent templ)
(overlay-put ov 'insert-in-front-hooks '(company-template-insert-hook))
(when after-clear-fn
(overlay-put ov 'company-template-after-clear after-clear-fn))
(overlay-put ov 'keymap company-template-field-map)
(overlay-put ov 'priority 101)
(push ov siblings)
(overlay-put templ 'company-template-fields siblings)))
(defun company-template-remove-field (ovl &optional clear)
(when (overlayp ovl)
(when (overlay-buffer ovl)
(when clear
(delete-region (overlay-start ovl) (overlay-end ovl)))
(delete-overlay ovl))
(let* ((templ (overlay-get ovl 'company-template-parent))
(siblings (overlay-get templ 'company-template-fields)))
(setq siblings (delq ovl siblings))
(overlay-put templ 'company-template-fields siblings))))
(defun company-template-clean-up (&optional pos)
"Clean up all templates that don't contain POS."
(let ((local-ovs (overlays-at (or pos (point)))))
(dolist (templ company-template--buffer-templates)
(unless (memq templ local-ovs)
(company-template-remove-template templ)))))
;; hooks ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun company-template-insert-hook (ovl after-p &rest _ignore)
"Called when a snippet input prompt is modified."
(unless after-p
(company-template-remove-field ovl t)))
(defun company-template-post-command ()
(company-template-clean-up)
(unless company-template--buffer-templates
(remove-hook 'post-command-hook 'company-template-post-command t)))
;; common ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun company-template-c-like-templatify (call)
(let* ((end (point-marker))
(beg (- (point) (length call)))
(templ (company-template-declare-template beg end))
paren-open paren-close)
(with-syntax-table (make-syntax-table (syntax-table))
(modify-syntax-entry ?< "(")
(modify-syntax-entry ?> ")")
(when (search-backward ")" beg t)
(setq paren-close (point-marker))
(forward-char 1)
(delete-region (point) end)
(backward-sexp)
(forward-char 1)
(setq paren-open (point-marker)))
(when (search-backward ">" beg t)
(let ((angle-close (point-marker)))
(forward-char 1)
(backward-sexp)
(forward-char)
(company-template--c-like-args templ angle-close)))
(when (looking-back "\\((\\*)\\)(" (line-beginning-position))
(delete-region (match-beginning 1) (match-end 1)))
(when paren-open
(goto-char paren-open)
(company-template--c-like-args templ paren-close)))
(if (overlay-get templ 'company-template-fields)
(company-template-move-to-first templ)
(company-template-remove-template templ)
(goto-char end))))
(defun company-template--c-like-args (templ end)
(let ((last-pos (point)))
(while (re-search-forward "\\([^,]+\\),?" end 'move)
(when (zerop (car (parse-partial-sexp last-pos (point))))
(company-template-add-field templ last-pos (match-end 1) nil
#'company-template--after-clear-c-like-field)
(skip-chars-forward " ")
(setq last-pos (point))))))
;; objc ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun company-template-objc-templatify (selector)
(let* ((end (point-marker))
(beg (- (point) (length selector) 1))
(templ (company-template-declare-template beg end))
(cnt 0))
(save-excursion
(goto-char beg)
(catch 'stop
(while (search-forward ":" end t)
(if (looking-at "\\(([^)]*)\\) ?")
(company-template-add-field templ (point) (match-end 1))
;; Not sure which conditions this case manifests under, but
;; apparently it did before, when I wrote the first test for this
;; function. FIXME: Revisit it.
(company-template-add-field templ (point)
(progn
(insert (format "arg%d" cnt))
(point)))
(when (< (point) end)
(insert " "))
(cl-incf cnt))
(when (>= (point) end)
(throw 'stop t)))))
(company-template-move-to-first templ)))
(provide 'company-template)
;;; company-template.el ends here
|
