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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)
+
+(defvar company-template-nav-map
+  (let ((keymap (make-sparse-keymap)))
+    (define-key keymap [tab] 'company-template-forward-field)
+    (define-key keymap (kbd "TAB") 'company-template-forward-field)
+    keymap))
+
+(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)
+    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--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