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ar-sexp.el
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ar-sexp.el
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;;; ar-sexp.el --- navigate balanced expressions and related stuff -*- lexical-binding: t; -*-
;; Copyright (C) 2023-2024 Andreas Röhler
;; Author: Andreas Röhler <[email protected]>
;; Version: 0.2
;; This file 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 2, or (at your option)
;; any later version.
;; This file 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; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;; Keywords: convenience
;; (defvar forward-sexp-function 'ar-sexp
;; "")
;;; Commentary:
;; Similar to ‘forward-sexp’ but, when called from inside a comment or string, match only inside.
;; Likewise, when called from outside a comment or string, ignore these for a match.
(require 'ar-thingatpt-utils)
(defun ar-forward-sexp-intern ()
(cond ((ignore-errors (ar-delimited-atpt))
(ar-end-of-delimited-atpt))
(t (skip-syntax-forward "^(")
(ar-end-of-delimited-atpt))))
(defun ar-backward-sexp-intern ()
"Internally used.
Argument CHAR the char before cursor position."
;; (let (;;(complement-char (ar--return-complement-char-maybe char))
;; (pps (parse-partial-sexp (point-min) (point)))
;; (char (ar--return-complement-char-maybe (char-before))))
(skip-chars-backward " \t\n\r\f")
(unless (bobp)
(let ((orig (point)))
(pcase (char-before)
(?\" (cond ((and (looking-back "\"\"\"" (line-beginning-position))
(save-excursion (forward-char -3) (nth 3 (parse-partial-sexp (point-min) (point)))))
(while (and (search-backward (match-string-no-properties 0))
(nth 8 (parse-partial-sexp (point-min) (point))))))
((save-excursion (forward-char -1) (nth 3 (parse-partial-sexp (point-min) (point))))
(forward-char -1)
(goto-char (nth 8 (parse-partial-sexp (point-min) (point)))))
(t (unless (bobp)
(forward-char -1)
(ar-backward-sexp-intern)))))
(?\} (unless
(progn
(forward-char -1)
(ar-backward-braced-atpt))
(goto-char orig)))
(?\) (unless
(progn
(forward-char -1)
(ar-backward-parentized-atpt))
(goto-char orig)))
(?\] (unless
(progn
(forward-char -1)
(ar-backward-bracketed-atpt))
(goto-char orig)))
(?\{ (forward-char -1))
(?\( (forward-char -1))
(?\[ (forward-char -1))
(_
(pcase (char-after)
(?\" (unless
(ar-backward-doublequoted-atpt)
(goto-char orig)
(unless (bobp)
(forward-char -1)
(ar-backward-sexp-intern))))
(?\} (unless
(progn
;; (forward-char -1)
(ar-backward-braced-atpt))
(goto-char orig)))
(?\) (unless
(progn
;; (forward-char -1)
(ar-backward-parentized-atpt))
(goto-char orig)))
(?\] (unless
(progn
;; (forward-char -1)
(ar-backward-bracketed-atpt))
(goto-char orig)))
(_ (if
(or (member (char-before) th-beg-delimiter-list)
(looking-back (concat "[" ar-delimiters-atpt "]") (line-beginning-position)))
(cond ((looking-back "\"\"\"\\|'''" (line-beginning-position))
(while (and (search-backward (match-string-no-properties 0))
(nth 8 (parse-partial-sexp (point-min) (point))))))
(t (save-restriction
(narrow-to-region (line-beginning-position) (point))
(ar-backward-delimited-atpt))))
(skip-syntax-backward "^|\s\"\\(\\)" (line-beginning-position))
;; (syntax-class-to-char 15)
)))))
(and (< (point) orig) (point)))))
(defun ar-forward-sexp (&optional arg)
"Move forward across one balanced expression (sexp).
Negative ARG -N means move backward across N balanced expressions.
If started from outside a string and comment, do not match inside
and vice versa.
Don't match an opening bracket with closing paren, but ], etc."
(interactive "P")
;; (if (eq 4 (prefix- numeric-value arg))
;; (with-temp-buffer
;; process code inside string or comment by temporarily removing that property
(let ((pps (parse-partial-sexp(point-min) (point)))
erg)
(if (< 0 (or arg 1))
(progn
;; (when(nth 8 pps)
;; (save-restriction
;; (narrow-to-region
;; (nth 8 pps)(point-max))))
(ar-forward-sexp-intern))
;; (when(nth 8 pps)
;; (save-restriction
;; (narrow-to-region
;; (nth 8 pps) (point))))
(ar-backward-sexp-intern))))
(defun ar-backward-sexp (&optional arg)
"Go backward over a balanced expression."
(interactive "P")
(ar-forward-sexp -1))
(defvar ar-align-default-re "\\(=>\\|->\\|<-\\|=\\)"
"Used by ar-align-symbol")
(defun ar-align-equal-sign()
(interactive "*")
(ar-align-symbol "=")
)
(defun ar-align-inline-comment()
""
(interactive "*")
(save-excursion
(let ((char (if (search-forward comment-start (line-end-position) t)
(progn
(goto-char (match-beginning 0))
(skip-chars-forward "^[[:blank:]]+")
(char-to-string (char-before)))
(when (search-backward comment-start (line-beginning-position) t)
(char-to-string (char-after))))))
(ar-align-symbol-intern char))))
(defun ar-align-mode-specific-stop()
(pcase major-mode
(`scala-mode (and (eq major-mode 'scala-mode) (looking-at " *case *$")))))
;; *** The two new functions 'looking-at-p' and 'string-match-p' can do
;; the same matching as 'looking-at' and 'string-match' without changing
;; the match data.
(defun ar-align-symbol-intern (regexp)
""
(save-excursion
(let ((end (copy-marker (line-end-position)))
(secondcolumn (and
(or (looking-at (concat "\\(" regexp "\\)[[:space:]]*"))
(looking-back (concat ".+\\(" regexp "\\)[[:space:]]*") (line-beginning-position)))
(not
(save-excursion
(goto-char (match-beginning 1))
(save-match-data
(looking-back (concat ".+" regexp ".*") (line-beginning-position)))))
;; (member (char-after) (list 32 ?\n ?\t ?\f))
;; haskell
;; (not (looking-back "main +\\(=+\\) *" (line-beginning-position)))
(goto-char (match-beginning 1))
;; better match-data then from looking-back
(looking-at regexp)
(current-column)))
(erg (match-string-no-properties 0))
(maxcolumn 0)
(indent (current-indentation))
(orig (copy-marker (point)))
col)
;; an equal-sign at current line
(when secondcolumn
;; (message "(match-string-no-properties 1): %s" (match-string-no-properties 1))
;; (setq erg (match-string-no-properties 1))
;; (message "erg: %s" erg)
(setq maxcolumn secondcolumn)
;; (setq orig (copy-marker (point)))
(while
(and (progn (beginning-of-line)
(not (bobp)))
(progn (forward-line -1)
(not (looking-at comment-start)))
(not (ar-empty-line-p))
(<= (current-indentation) indent)
(or
(ar-align-mode-specific-stop)
(setq col (string-match erg (buffer-substring-no-properties (line-beginning-position) (line-end-position))))))
(when col (move-to-column col))
(when (< maxcolumn (current-column))
(setq maxcolumn (current-column))))
;; before going downward, reach the last match
;; (when (match-beginning 1) (goto-char (match-beginning 1)))
(while (<= (line-end-position) end)
(setq col (string-match erg (buffer-substring-no-properties (line-beginning-position) (line-end-position))))
(when col (move-to-column col)
(when (< (current-column) maxcolumn)
(insert (make-string (- maxcolumn (current-column)) 32))))
(forward-line 1))
(goto-char orig)
;; (when (concat negated-re "+ +\\(" regexp "\\)[[:blank:]]+.*")
;; (when (< (current-column) maxcolumn)
;; (insert (make-string (- maxcolumn (current-column)) 32))))
))))
(defun ar-align-symbol (&optional arg)
(interactive "*p")
(unless (nth 8 (parse-partial-sexp (point-min) (point)))
(let ((regexp
(cond ((stringp arg)
arg)
((not (looking-at "[[:alnum:]]"))
(char-to-string (char-after)))
(t ar-align-default-re))))
;; (when t
(when (or (eq this-command 'self-insert-command) (eq (prefix-numeric-value arg) 1))
(ar-align-symbol-intern regexp)))))
(defun ar-align-in-current-buffer ()
(interactive)
(add-hook 'post-command-hook #'ar-align-symbol nil t))
(provide 'ar-sexp)
;;; ar-sexp.el ends here