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;;; js2r-iife.el --- IIFE wrapping 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 'js2r-helpers)
(require 'cl-lib)
(defconst js2r--iife-regexp "[[:space:]]*(\\(?:function ([^)]*)\\|([^)]*) => {\\)")
(defconst js2r--use-strict-regexp "[[:space:]]*\\(['\"]\\)use strict\\1")
(defun js2r-looking-at-iife-p ()
"Check if `point' is `looking-at' an IIFE."
(looking-at-p js2r--iife-regexp))
(defun js2r-wrap-in-iife (beg end)
"Wrap the current region in an iife.
BEG and END are the start and end of the region, respectively."
(interactive "r")
(cl-assert (memq js2r-iife-style '(function-inner function lambda))
nil "`js2r-iife-style' invalid")
(let ((end-marker (copy-marker end t))
(strict js2r-use-strict))
(save-excursion
(goto-char beg)
(when (js2r-looking-at-iife-p)
(user-error "Region is already an immediately invoked function expression"))
(when (looking-at-p js2r--use-strict-regexp)
(setq strict nil))
(insert "(" (pcase js2r-iife-style
((or `function `function-inner) "function ()")
(`lambda "() =>"))
" {\n")
(when strict (insert (pcase js2r-prefered-quote-type
(1 "\"use strict\"")
(2 "'use strict'"))
";\n"))
(goto-char end-marker)
(unless (eq (char-before) ?\n)
(insert "\n"))
(insert "}" (pcase js2r-iife-style
((or `function `lambda) ")()")
(`function-inner "())"))
";\n")
(indent-region beg (point)))
(back-to-indentation)
(set-marker end-marker nil)))
(defun js2r-wrap-buffer-in-iife ()
"Wrap the entire buffer in an immediately invoked function expression"
(interactive)
(let ((eob-nl? (eq (char-before (point-max)) ?\n)))
(js2r-wrap-in-iife (point-min) (point-max))
(unless eob-nl?
(save-excursion
(goto-char (point-max))
;; `backward-delete-char' is advised in DOOM
(delete-char -1)))))
(defun js2r--selected-name-positions ()
"Returns the (beginning . end) of the name at cursor, or active region."
(let ((current-node (js2-node-at-point))
beg end)
(unless (js2-name-node-p current-node)
(setq current-node (js2-node-at-point (- (point) 1))))
(if (not (and current-node (js2-name-node-p current-node)))
(error "Point is not on an identifier."))
(if (use-region-p)
(cons (region-beginning) (region-end))
(progn
(setq end (+ (js2-node-abs-pos current-node)
(js2-node-len current-node)))
(skip-syntax-backward ".w_")
(cons (point) end)))))
(defun js2r--read-iife-short-name (name)
"Read an iife short name for NAME.
See `js2r-add-global-to-iife'."
(read-string "Short name (%s): " (substring name 0 1) nil name))
(defun js2r-add-global-to-iife (global short)
"Add GLOBAL under the name SHORT to the current IIFE."
(interactive
(let ((global (read-string "Global: " (thing-at-point 'symbol))))
(list global (js2r--read-iife-short-name global))))
(save-excursion
(save-match-data
(atomic-change-group
(let* (beg end)
(unless (search-backward-regexp js2r--iife-regexp)
(error "No immediately invoked function expression found"))
(goto-char (match-end 0))
(save-excursion
(search-backward ")")
(unless (= (char-before) ?\()
(insert ", "))
(insert short))
(setq beg (point))
(backward-char)
(forward-list)
(setq end (point))
(unless (search-forward "(" (+ 3 (point)) t)
(user-error "IIFE not called"))
(forward-char -1)
(forward-list)
(forward-char -1)
(unless (eq (char-before) ?\()
(insert ", "))
(insert global)
(goto-char beg)
(while (search-forward-regexp (format "\\_<%s\\_>" global) end t)
(replace-match short t t)))))))
(defun js2r-inject-global-in-iife ()
"Create shortcut for marked global by injecting it in the wrapping IIFE"
(interactive)
(js2r--guard)
(js2r--wait-for-parse
(cl-destructuring-bind (beg . end) (js2r--selected-name-positions)
(deactivate-mark)
(let ((name (buffer-substring beg end)))
(js2r-add-global-to-iife name (js2r--read-iife-short-name name))))))
(defun js2r-unwrap-iife ()
"Unwrap the IIFE at `point'."
(interactive)
(save-match-data
(unless (looking-at js2r--iife-regexp)
(user-error "`point' is not on an IIFE"))
(let ((body (save-excursion
(goto-char (match-end 0))
(forward-char -1)
(let ((start (1+ (point))))
(forward-list)
(forward-char -1)
(buffer-substring-no-properties start (point))))))
(let ((start (point)))
(forward-list)
(delete-region start (point))
(when (looking-at "\\(([^)]*)\\)?;$?")
(delete-region (match-beginning 0) (match-end 0)))
(insert (string-trim body))
(indent-region start (point))
(back-to-indentation)))))
(defun js2r-unwrap-iife-in-buffer ()
"Unwrap the first IIFE in the current buffer.
See `js2r-wrap-buffer-in-iife'."
(search-forward-regexp js2r--iife-regexp)
(js2r-unwrap-iife))
(provide 'js2r-iife)
;;; js2-iife.el ends here
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