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567 lines
23 KiB
EmacsLisp
567 lines
23 KiB
EmacsLisp
;;; elec-pair.el --- Automatic parenthesis pairing -*- lexical-binding:t -*-
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;; Copyright (C) 2013 Free Software Foundation, Inc.
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;; Author: João Távora <joaotavora@gmail.com>
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(require 'electric)
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;;; Electric pairing.
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(defcustom electric-pair-pairs
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'((?\" . ?\"))
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"Alist of pairs that should be used regardless of major mode.
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Pairs of delimiters in this list are a fallback in case they have
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no syntax relevant to `electric-pair-mode' in the mode's syntax
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table.
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See also the variable `electric-pair-text-pairs'."
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:version "24.1"
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:group 'electricity
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:type '(repeat (cons character character)))
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;;;###autoload
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(defcustom electric-pair-text-pairs
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'((?\" . ?\" ))
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"Alist of pairs that should always be used in comments and strings.
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Pairs of delimiters in this list are a fallback in case they have
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no syntax relevant to `electric-pair-mode' in the syntax table
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defined in `electric-pair-text-syntax-table'"
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:version "24.4"
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:group 'electricity
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:type '(repeat (cons character character)))
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(defcustom electric-pair-skip-self #'electric-pair-default-skip-self
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"If non-nil, skip char instead of inserting a second closing paren.
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When inserting a closing paren character right before the same character,
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just skip that character instead, so that hitting ( followed by ) results
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in \"()\" rather than \"())\".
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This can be convenient for people who find it easier to hit ) than C-f.
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Can also be a function of one argument (the closer char just
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inserted), in which case that function's return value is
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considered instead."
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:version "24.1"
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:group 'electricity
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:type '(choice
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(const :tag "Never skip" nil)
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(const :tag "Help balance" electric-pair-default-skip-self)
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(const :tag "Always skip" t)
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function))
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(defcustom electric-pair-inhibit-predicate
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#'electric-pair-default-inhibit
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"Predicate to prevent insertion of a matching pair.
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The function is called with a single char (the opening char just inserted).
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If it returns non-nil, then `electric-pair-mode' will not insert a matching
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closer."
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:version "24.4"
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:group 'electricity
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:type '(choice
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(const :tag "Conservative" electric-pair-conservative-inhibit)
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(const :tag "Help balance" electric-pair-default-inhibit)
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(const :tag "Always pair" ignore)
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function))
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(defcustom electric-pair-preserve-balance t
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"Non-nil if default pairing and skipping should help balance parentheses.
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The default values of `electric-pair-inhibit-predicate' and
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`electric-pair-skip-self' check this variable before delegating to other
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predicates reponsible for making decisions on whether to pair/skip some
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characters based on the actual state of the buffer's parenthesis and
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quotes."
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:version "24.4"
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:group 'electricity
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:type 'boolean)
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(defcustom electric-pair-delete-adjacent-pairs t
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"If non-nil, backspacing an open paren also deletes adjacent closer.
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Can also be a function of no arguments, in which case that function's
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return value is considered instead."
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:version "24.4"
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:group 'electricity
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:type '(choice
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(const :tag "Yes" t)
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(const :tag "No" nil)
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function))
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(defcustom electric-pair-open-newline-between-pairs t
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"If non-nil, a newline between adjacent parentheses opens an extra one.
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Can also be a function of no arguments, in which case that function's
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return value is considered instead."
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:version "24.4"
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:group 'electricity
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:type '(choice
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(const :tag "Yes" t)
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(const :tag "No" nil)
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function))
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(defcustom electric-pair-skip-whitespace t
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"If non-nil skip whitespace when skipping over closing parens.
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The specific kind of whitespace skipped is given by the variable
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`electric-pair-skip-whitespace-chars'.
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The symbol `chomp' specifies that the skipped-over whitespace
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should be deleted.
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Can also be a function of no arguments, in which case that function's
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return value is considered instead."
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:version "24.4"
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:group 'electricity
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:type '(choice
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(const :tag "Yes, jump over whitespace" t)
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(const :tag "Yes, and delete whitespace" 'chomp)
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(const :tag "No, no whitespace skipping" nil)
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function))
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(defcustom electric-pair-skip-whitespace-chars (list ?\t ?\s ?\n)
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"Whitespace characters considered by `electric-pair-skip-whitespace'."
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:version "24.4"
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:group 'electricity
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:type '(choice (set (const :tag "Space" ?\s)
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(const :tag "Tab" ?\t)
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(const :tag "Newline" ?\n))
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(list character)))
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(defun electric-pair--skip-whitespace ()
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"Skip whitespace forward, not crossing comment or string boundaries."
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(let ((saved (point))
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(string-or-comment (nth 8 (syntax-ppss))))
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(skip-chars-forward (apply #'string electric-pair-skip-whitespace-chars))
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(unless (eq string-or-comment (nth 8 (syntax-ppss)))
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(goto-char saved))))
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(defvar electric-pair-text-syntax-table prog-mode-syntax-table
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"Syntax table used when pairing inside comments and strings.
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`electric-pair-mode' considers this syntax table only when point in inside
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quotes or comments. If lookup fails here, `electric-pair-text-pairs' will
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be considered.")
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(defun electric-pair-backward-delete-char (n &optional killflag untabify)
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"Delete characters backward, and maybe also two adjacent paired delimiters.
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Remaining behaviour is given by `backward-delete-char' or, if UNTABIFY is
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non-nil, `backward-delete-char-untabify'."
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(interactive "*p\nP")
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(let* ((prev (char-before))
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(next (char-after))
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(syntax-info (electric-pair-syntax-info prev))
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(syntax (car syntax-info))
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(pair (cadr syntax-info)))
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(when (and (if (functionp electric-pair-delete-adjacent-pairs)
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(funcall electric-pair-delete-adjacent-pairs)
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electric-pair-delete-adjacent-pairs)
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next
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(memq syntax '(?\( ?\" ?\$))
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(eq pair next))
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(delete-char 1 killflag))
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(if untabify
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(backward-delete-char-untabify n killflag)
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(backward-delete-char n killflag))))
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(defun electric-pair-backward-delete-char-untabify (n &optional killflag)
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"Delete characters backward, and maybe also two adjacent paired delimiters.
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Remaining behaviour is given by `backward-delete-char-untabify'."
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(interactive "*p\nP")
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(electric-pair-backward-delete-char n killflag t))
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(defun electric-pair-conservative-inhibit (char)
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(or
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;; I find it more often preferable not to pair when the
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;; same char is next.
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(eq char (char-after))
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;; Don't pair up when we insert the second of "" or of ((.
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(and (eq char (char-before))
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(eq char (char-before (1- (point)))))
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;; I also find it often preferable not to pair next to a word.
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(eq (char-syntax (following-char)) ?w)))
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(defun electric-pair-syntax-info (command-event)
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"Calculate a list (SYNTAX PAIR UNCONDITIONAL STRING-OR-COMMENT-START).
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SYNTAX is COMMAND-EVENT's syntax character. PAIR is
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COMMAND-EVENT's pair. UNCONDITIONAL indicates the variables
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`electric-pair-pairs' or `electric-pair-text-pairs' were used to
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lookup syntax. STRING-OR-COMMENT-START indicates that point is
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inside a comment of string."
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(let* ((pre-string-or-comment (nth 8 (save-excursion
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(syntax-ppss (1- (point))))))
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(post-string-or-comment (nth 8 (syntax-ppss (point))))
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(string-or-comment (and post-string-or-comment
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pre-string-or-comment))
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(table (if string-or-comment
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electric-pair-text-syntax-table
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(syntax-table)))
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(table-syntax-and-pair (with-syntax-table table
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(list (char-syntax command-event)
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(or (matching-paren command-event)
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command-event))))
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(fallback (if string-or-comment
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(append electric-pair-text-pairs
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electric-pair-pairs)
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electric-pair-pairs))
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(direct (assq command-event fallback))
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(reverse (rassq command-event fallback)))
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(cond
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((memq (car table-syntax-and-pair)
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'(?\" ?\( ?\) ?\$))
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(append table-syntax-and-pair (list nil string-or-comment)))
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(direct (if (eq (car direct) (cdr direct))
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(list ?\" command-event t string-or-comment)
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(list ?\( (cdr direct) t string-or-comment)))
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(reverse (list ?\) (car reverse) t string-or-comment)))))
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(defun electric-pair--insert (char)
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(let ((last-command-event char)
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(blink-matching-paren nil)
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(electric-pair-mode nil))
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(self-insert-command 1)))
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(defun electric-pair--syntax-ppss (&optional pos where)
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"Like `syntax-ppss', but sometimes fallback to `parse-partial-sexp'.
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WHERE is list defaulting to '(string comment) and indicates
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when to fallback to `parse-partial-sexp'."
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(let* ((pos (or pos (point)))
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(where (or where '(string comment)))
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(quick-ppss (syntax-ppss))
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(quick-ppss-at-pos (syntax-ppss pos)))
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(if (or (and (nth 3 quick-ppss) (memq 'string where))
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(and (nth 4 quick-ppss) (memq 'comment where)))
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(with-syntax-table electric-pair-text-syntax-table
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(parse-partial-sexp (1+ (nth 8 quick-ppss)) pos))
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;; HACK! cc-mode apparently has some `syntax-ppss' bugs
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(if (memq major-mode '(c-mode c++ mode))
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(parse-partial-sexp (point-min) pos)
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quick-ppss-at-pos))))
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;; Balancing means controlling pairing and skipping of parentheses so
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;; that, if possible, the buffer ends up at least as balanced as
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;; before, if not more. The algorithm is slightly complex because some
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;; situations like "()))" need pairing to occur at the end but not at
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;; the beginning. Balancing should also happen independently for
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;; different types of parentheses, so that having your {}'s unbalanced
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;; doesn't keep `electric-pair-mode' from balancing your ()'s and your
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;; []'s.
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(defun electric-pair--balance-info (direction string-or-comment)
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"Examine lists forward or backward according to DIRECTIONS's sign.
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STRING-OR-COMMENT is info suitable for running `parse-partial-sexp'.
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Return a cons of two descritions (MATCHED-P . PAIR) for the
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innermost and outermost lists that enclose point. The outermost
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list enclosing point is either the first top-level or first
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mismatched list found by uplisting.
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If the outermost list is matched, don't rely on its PAIR. If
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point is not enclosed by any lists, return ((T) (T))."
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(let* (innermost
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outermost
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(table (if string-or-comment
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electric-pair-text-syntax-table
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(syntax-table)))
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(at-top-level-or-equivalent-fn
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;; called when `scan-sexps' ran perfectly, when when it
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;; found a parenthesis pointing in the direction of
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;; travel. Also when travel started inside a comment and
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;; exited it
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#'(lambda ()
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(setq outermost (list t))
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(unless innermost
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(setq innermost (list t)))))
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(ended-prematurely-fn
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;; called when `scan-sexps' crashed against a parenthesis
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;; pointing opposite the direction of travel. After
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;; traversing that character, the idea is to travel one sexp
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;; in the opposite direction looking for a matching
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;; delimiter.
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#'(lambda ()
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(let* ((pos (point))
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(matched
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(save-excursion
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(cond ((< direction 0)
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(condition-case nil
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(eq (char-after pos)
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(with-syntax-table table
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(matching-paren
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(char-before
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(scan-sexps (point) 1)))))
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(scan-error nil)))
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(t
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;; In this case, no need to use
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;; `scan-sexps', we can use some
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;; `electric-pair--syntax-ppss' in this
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;; case (which uses the quicker
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;; `syntax-ppss' in some cases)
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(let* ((ppss (electric-pair--syntax-ppss
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(1- (point))))
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(start (car (last (nth 9 ppss))))
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(opener (char-after start)))
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(and start
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(eq (char-before pos)
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(or (with-syntax-table table
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(matching-paren opener))
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opener))))))))
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(actual-pair (if (> direction 0)
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(char-before (point))
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(char-after (point)))))
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(unless innermost
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(setq innermost (cons matched actual-pair)))
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(unless matched
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(setq outermost (cons matched actual-pair)))))))
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(save-excursion
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(while (not outermost)
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(condition-case err
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(with-syntax-table table
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(scan-sexps (point) (if (> direction 0)
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(point-max)
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(- (point-max))))
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(funcall at-top-level-or-equivalent-fn))
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(scan-error
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(cond ((or
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;; some error happened and it is not of the "ended
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;; prematurely" kind"...
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(not (string-match "ends prematurely" (nth 1 err)))
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;; ... or we were in a comment and just came out of
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;; it.
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(and string-or-comment
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(not (nth 8 (syntax-ppss)))))
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(funcall at-top-level-or-equivalent-fn))
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(t
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;; exit the sexp
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(goto-char (nth 3 err))
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(funcall ended-prematurely-fn)))))))
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(cons innermost outermost)))
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(defun electric-pair--looking-at-unterminated-string-p (char)
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"Say if following string starts with CHAR and is unterminated."
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;; FIXME: ugly/naive
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(save-excursion
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(skip-chars-forward (format "^%c" char))
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(while (not (zerop (% (save-excursion (skip-syntax-backward "\\")) 2)))
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(unless (eobp)
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(forward-char 1)
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(skip-chars-forward (format "^%c" char))))
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(and (not (eobp))
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(condition-case nil
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(progn (forward-sexp) nil)
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(scan-error t)))))
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(defun electric-pair--inside-string-p (char)
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"Say if point is inside a string started by CHAR.
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A comments text is parsed with `electric-pair-text-syntax-table'.
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Also consider strings within comments, but not strings within
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strings."
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;; FIXME: could also consider strings within strings by examining
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;; delimiters.
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(let* ((ppss (electric-pair--syntax-ppss (point) '(comment))))
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(memq (nth 3 ppss) (list t char))))
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(defun electric-pair-inhibit-if-helps-balance (char)
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"Return non-nil if auto-pairing of CHAR would hurt parentheses' balance.
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Works by first removing the character from the buffer, then doing
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some list calculations, finally restoring the situation as if nothing
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happened."
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(pcase (electric-pair-syntax-info char)
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(`(,syntax ,pair ,_ ,s-or-c)
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(unwind-protect
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(progn
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(delete-char -1)
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(cond ((eq ?\( syntax)
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(let* ((pair-data
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(electric-pair--balance-info 1 s-or-c))
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(outermost (cdr pair-data)))
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(cond ((car outermost)
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nil)
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(t
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(eq (cdr outermost) pair)))))
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((eq syntax ?\")
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(electric-pair--looking-at-unterminated-string-p char))))
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(insert-char char)))))
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(defun electric-pair-skip-if-helps-balance (char)
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"Return non-nil if skipping CHAR would benefit parentheses' balance.
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Works by first removing the character from the buffer, then doing
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some list calculations, finally restoring the situation as if nothing
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happened."
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(pcase (electric-pair-syntax-info char)
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(`(,syntax ,pair ,_ ,s-or-c)
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(unwind-protect
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(progn
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(delete-char -1)
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(cond ((eq syntax ?\))
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(let* ((pair-data
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(electric-pair--balance-info
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-1 s-or-c))
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(innermost (car pair-data))
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(outermost (cdr pair-data)))
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(and
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(cond ((car outermost)
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(car innermost))
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((car innermost)
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(not (eq (cdr outermost) pair)))))))
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((eq syntax ?\")
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(electric-pair--inside-string-p char))))
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(insert-char char)))))
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(defun electric-pair-default-skip-self (char)
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(if electric-pair-preserve-balance
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(electric-pair-skip-if-helps-balance char)
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t))
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(defun electric-pair-default-inhibit (char)
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(if electric-pair-preserve-balance
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(electric-pair-inhibit-if-helps-balance char)
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(electric-pair-conservative-inhibit char)))
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(defun electric-pair-post-self-insert-function ()
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(let* ((pos (and electric-pair-mode (electric--after-char-pos)))
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(skip-whitespace-info))
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(pcase (electric-pair-syntax-info last-command-event)
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(`(,syntax ,pair ,unconditional ,_)
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(cond
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((null pos) nil)
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;; Wrap a pair around the active region.
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;;
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((and (memq syntax '(?\( ?\) ?\" ?\$)) (use-region-p))
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;; FIXME: To do this right, we'd need a post-self-insert-function
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;; so we could add-function around it and insert the closer after
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;; all the rest of the hook has run.
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(if (or (eq syntax ?\")
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(and (eq syntax ?\))
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(>= (point) (mark)))
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(and (not (eq syntax ?\)))
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(>= (mark) (point))))
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(save-excursion
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(goto-char (mark))
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(electric-pair--insert pair))
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(delete-region pos (1- pos))
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(electric-pair--insert pair)
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(goto-char (mark))
|
|
(electric-pair--insert last-command-event)))
|
|
;; Backslash-escaped: no pairing, no skipping.
|
|
((save-excursion
|
|
(goto-char (1- pos))
|
|
(not (zerop (% (skip-syntax-backward "\\") 2))))
|
|
nil)
|
|
;; Skip self.
|
|
((and (memq syntax '(?\) ?\" ?\$))
|
|
(and (or unconditional
|
|
(if (functionp electric-pair-skip-self)
|
|
(funcall electric-pair-skip-self last-command-event)
|
|
electric-pair-skip-self))
|
|
(save-excursion
|
|
(when (setq skip-whitespace-info
|
|
(if (functionp electric-pair-skip-whitespace)
|
|
(funcall electric-pair-skip-whitespace)
|
|
electric-pair-skip-whitespace))
|
|
(electric-pair--skip-whitespace))
|
|
(eq (char-after) last-command-event))))
|
|
;; This is too late: rather than insert&delete we'd want to only
|
|
;; skip (or insert in overwrite mode). The difference is in what
|
|
;; goes in the undo-log and in the intermediate state which might
|
|
;; be visible to other post-self-insert-hook. We'll just have to
|
|
;; live with it for now.
|
|
(when skip-whitespace-info
|
|
(electric-pair--skip-whitespace))
|
|
(delete-region (1- pos) (if (eq skip-whitespace-info 'chomp)
|
|
(point)
|
|
pos))
|
|
(forward-char))
|
|
;; Insert matching pair.
|
|
((and (memq syntax `(?\( ?\" ?\$))
|
|
(not overwrite-mode)
|
|
(or unconditional
|
|
(not (funcall electric-pair-inhibit-predicate
|
|
last-command-event))))
|
|
(save-excursion (electric-pair--insert pair)))))
|
|
(t
|
|
(when (and (if (functionp electric-pair-open-newline-between-pairs)
|
|
(funcall electric-pair-open-newline-between-pairs)
|
|
electric-pair-open-newline-between-pairs)
|
|
(eq last-command-event ?\n)
|
|
(not (eobp))
|
|
(eq (save-excursion
|
|
(skip-chars-backward "\t\s")
|
|
(char-before (1- (point))))
|
|
(matching-paren (char-after))))
|
|
(save-excursion (newline 1 t)))))))
|
|
|
|
(put 'electric-pair-post-self-insert-function 'priority 20)
|
|
|
|
(defun electric-pair-will-use-region ()
|
|
(and (use-region-p)
|
|
(memq (car (electric-pair-syntax-info last-command-event))
|
|
'(?\( ?\) ?\" ?\$))))
|
|
|
|
(defvar electric-pair-mode-map
|
|
(let ((map (make-sparse-keymap)))
|
|
(define-key map [remap backward-delete-char-untabify]
|
|
'electric-pair-backward-delete-char-untabify)
|
|
(define-key map [remap backward-delete-char]
|
|
'electric-pair-backward-delete-char)
|
|
(define-key map [remap delete-backward-char]
|
|
'electric-pair-backward-delete-char)
|
|
map)
|
|
"Keymap used by `electric-pair-mode'.")
|
|
|
|
;;;###autoload
|
|
(define-minor-mode electric-pair-mode
|
|
"Toggle automatic parens pairing (Electric Pair mode).
|
|
With a prefix argument ARG, enable Electric Pair mode if ARG is
|
|
positive, and disable it otherwise. If called from Lisp, enable
|
|
the mode if ARG is omitted or nil.
|
|
|
|
Electric Pair mode is a global minor mode. When enabled, typing
|
|
an open parenthesis automatically inserts the corresponding
|
|
closing parenthesis. \(Likewise for brackets, etc.)."
|
|
:global t :group 'electricity
|
|
(if electric-pair-mode
|
|
(progn
|
|
(add-hook 'post-self-insert-hook
|
|
#'electric-pair-post-self-insert-function)
|
|
(electric--sort-post-self-insertion-hook)
|
|
(add-hook 'self-insert-uses-region-functions
|
|
#'electric-pair-will-use-region))
|
|
(remove-hook 'post-self-insert-hook
|
|
#'electric-pair-post-self-insert-function)
|
|
(remove-hook 'self-insert-uses-region-functions
|
|
#'electric-pair-will-use-region)))
|
|
|
|
(provide 'elec-pair)
|
|
|
|
;;; elec-pair.el ends here
|