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+;;; js2r-helpers.el --- Private helper functions for js2-refactor    -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2012-2014 Magnar Sveen
+;; Copyright (C) 2015-2016 Magnar Sveen and Nicolas Petton
+
+;; Author: Magnar Sveen <magnars@gmail.com>,
+;;         Nicolas Petton <nicolas@petton.fr>
+;; Keywords: conveniences
+
+;; This program 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.
+
+;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'dash)
+(require 's)
+(require 'js2-mode)
+
+(defmacro js2r--wait-for-parse (&rest body)
+  "Evaluate BODY once the current buffer has been parsed."
+  (declare (debug def-body))
+  `(js2-mode-wait-for-parse (lambda () ,@body)))
+
+(defun js2r--wrap-text (&rest text)
+  "Wrap TEXT with the prefered quotes.  The prefered quotes is set with `js2r-prefered-quote-type'."
+  (let ((prefered-quotes "\""))
+    (when (= 2 js2r-prefered-quote-type)
+      (setq prefered-quotes "'"))
+    (concat prefered-quotes (apply 'concat text) prefered-quotes)))
+
+(defun js2r--fix-special-modifier-combinations (key)
+  (case key
+    ("C-s-i" "s-TAB")
+    ("C-s-m" "s-RET")
+    (otherwise key)))
+
+(defun js2r--key-pairs-with-modifier (modifier keys)
+  (->> (string-to-list keys)
+    (--map (js2r--fix-special-modifier-combinations
+            (concat modifier (char-to-string it))))
+    (s-join " ")
+    (read-kbd-macro)))
+
+(defun js2r--key-pairs-with-prefix (prefix keys)
+  (read-kbd-macro (concat prefix " " keys)))
+
+(defun js2r--guard ()
+  (when js2-parsed-errors
+    (error "Can't refactor while buffer has parse errors")))
+
+(defun js2r--current-quotes-char ()
+  "The char that is the current quote delimiter"
+  (nth 3 (syntax-ppss)))
+
+(defalias 'js2r--point-inside-string-p 'js2r--current-quotes-char)
+
+(defun js2r--closest-node-where (p node)
+  (if (or (null node)
+          (apply p node nil))
+      node
+    (js2r--closest-node-where p (js2-node-parent node))))
+
+(defun js2r--closest (p)
+  (save-excursion
+    (cond
+     ((bolp) (back-to-indentation))
+     ((looking-at ";") (forward-char -1))
+     ((looking-back ";") (forward-char -2))
+     ((looking-back "}") (forward-char -1)))
+    (js2r--closest-node-where p (js2-node-at-point))))
+
+(defun js2r--goto-and-delete-node (node)
+  (goto-char (js2-node-abs-pos node))
+  (delete-char (js2-node-len node)))
+
+
+(defun js2r--path-to-root (node)
+  (when node
+    (cons node (js2r--path-to-root (js2-node-parent node)))))
+
+(defun js2r--first-common-ancestor (node1 node2)
+  (if (eq node1 node2)
+      node1
+    (let ((path1 (reverse (js2r--path-to-root node1)))
+          (path2 (reverse (js2r--path-to-root node2)))
+          (last-common nil))
+      (while (eq (car path1) (car path2))
+        (setq last-common (car path1))
+        (setq path1 (cdr path1))
+        (setq path2 (cdr path2)))
+      last-common)))
+
+(defun js2r--first-common-ancestor-in-region (beg end)
+  (js2r--first-common-ancestor (js2-node-at-point beg)
+                               (js2-node-at-point end)))
+
+;; abstract away node type on some common property getters
+(defun js2r--node-target (node)
+  (cond
+   ((js2-call-node-p node) (js2-call-node-target node))
+   ((js2-new-node-p node) (js2-new-node-target node))
+   (:else nil)))
+
+(defun js2r--node-args (node)
+  (cond
+   ((js2-call-node-p node) (js2-call-node-args node))
+   ((js2-new-node-p node) (js2-new-node-args node))
+   (:else nil)))
+
+(defun js2r--node-lp (node)
+  (cond
+   ((js2-call-node-p node) (js2-call-node-lp node))
+   ((js2-new-node-p node) (js2-new-node-lp node))
+   (:else nil)))
+
+(defun js2r--node-rp (node)
+  (cond
+   ((js2-call-node-p node) (js2-call-node-rp node))
+   ((js2-new-node-p node) (js2-new-node-rp node))
+   (:else nil)))
+
+(defun js2r--node-kids (node)
+  (cond
+   ((js2-function-node-p node) (js2-block-node-kids (js2-function-node-body node)))
+   ((js2-if-node-p node) (js2-scope-kids (js2-if-node-then-part node)))
+   ((js2-for-node-p node) (js2-block-node-kids (js2-for-node-body node)))
+   ((js2-while-node-p node) (js2-block-node-kids (js2-while-node-body node)))))
+
+;; finding expressions and arguments
+
+(defun js2r--closest-extractable-node ()
+  "Return the most appropriate node the be extracted into a variable or paramter.
+Lookup the closest expression node from the point, or the closest literal node instead.
+If no node is found, signal an error."
+  (or (or (js2r--closest #'js2r--expression-p)
+          (js2r--closest #'js2r--literal-node-p))
+      (error "Cannot perform refactoring: Nothing to extract at point")))
+
+(defun js2r--closest-stmt-node ()
+  "Return the closest standalone statement node.
+Special care is taken for if branch nodes: if a statement node is
+part of an if branch node (like 'else if' nodes), return the
+parent node."
+  (let* ((node (js2-node-parent-stmt (js2-node-at-point)))
+        (parent (js2-node-parent node)))
+    (if (and (js2-if-node-p node)
+             (js2-if-node-p parent))
+        parent
+      node)))
+
+(defun js2r--argument-p (node)
+  (let ((parent (js2-node-parent node)))
+    (and (js2-call-node-p parent)
+         (member node (js2-call-node-args parent)))))
+
+(defun js2r--expression-p (node)
+  (or (js2-call-node-p node)
+      (js2r--argument-p node)
+      (and (js2-prop-get-node-p node)
+           (not (js2-call-node-p (js2-node-parent node))))))
+
+(defun js2r--literal-node-p (node)
+  (or (js2-object-node-p node)
+      (js2-string-node-p node)
+      (js2-number-node-p node)
+      (js2r--boolean-node-p node)))
+
+(defun js2r--boolean-node-p (node)
+  (let* ((beg (js2-node-abs-pos node))
+         (end (js2-node-abs-end node))
+         (content (buffer-substring beg end)))
+    (and (js2-keyword-node-p node)
+         (member content '("true" "false")))))
+
+(defun js2r--single-complete-expression-between-p (beg end)
+  (let ((ancestor (js2r--first-common-ancestor-in-region beg (- end 1))))
+    (and (= beg (js2-node-abs-pos ancestor))
+         (= end (js2-node-abs-end ancestor)))))
+
+
+;; executing a list of changes
+;; ensures changes are executed from last to first
+
+(defun js2r--by-end-descending (change1 change2)
+  (> (plist-get change1 :end)
+     (plist-get change2 :end)))
+
+(defun js2r--any-overlapping-changes (sorted-changes)
+  (--any?
+   (let ((one (car it))
+         (two (cadr it)))
+     (< (plist-get one :beg)
+        (plist-get two :end)))
+   (-partition-in-steps 2 1 sorted-changes)))
+
+(defun js2r--execute-changes (changes)
+  (when changes
+    (let ((sorted-changes (sort changes 'js2r--by-end-descending)))
+      (when (js2r--any-overlapping-changes sorted-changes)
+        (error "These changes overlap, cannot execute properly."))
+      (let ((abs-end (set-marker (make-marker) (1+ (plist-get (car sorted-changes) :end))))
+            (abs-beg (plist-get (car (last sorted-changes)) :beg)))
+        (--each sorted-changes
+          (goto-char (plist-get it :beg))
+          (delete-char (- (plist-get it :end) (plist-get it :beg)))
+          (insert (plist-get it :contents)))
+        (indent-region abs-beg abs-end)
+        (set-marker abs-end nil)))))
+
+(provide 'js2r-helpers)
+;;; js2-helpers.el ends here