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csound-indentation.el
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csound-indentation.el
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;;; csound-indentation.el --- A major mode for interacting and coding Csound
;; Copyright (C) 2017 - 2023 Hlöðver Sigurðsson
;; Author: Hlöðver Sigurðsson <hlolli@gmail.com>
;; Version: 0.2.9
;; Package-Requires: ((emacs "25") (shut-up "0.3.2") (multi "2.0.1") (dash "2.16.0") (highlight "0"))
;; URL: https://github.com/hlolli/csound-mode
;; 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/>.
;;; Commentary:
;; Indentation rules for csound-mode
;;; Code:
(require 'csound-util)
(require 'csound-score)
;;; define some customizable variables
(defcustom csound-indentation-spaces 2
"Set how many spaces are in indentation."
:type 'integer
:group 'csound-mode)
(defcustom csound-indentation-aggressive-score nil
"If true, then align blocks will be called for every indent
calls in a score file or within CsScore tags. Works well
when used in combination with aggressive-indent mode.
(defaults to nil(false))"
:type 'boolean
:group 'csound-mode)
(defcustom csound-indentation-indent-goto nil
"If true, then anything that comes after goto symbol
will be indented."
:type 'boolean
:group 'csound-mode)
;;; define some predicate functions for checking regexp
(defun csound-indentation--current-line-breaks-p ()
"returns t if a \ is found not in the middle of a word in the current line, otherwise nil"
(if (save-excursion
(beginning-of-line 0)
(search-forward-regexp
"\\B\\\\\\B" (csound-util-line-boundry) t 1))
t nil))
(defun csound-indentation--previous-line-breaks-p ()
"returns t if a \ not in the middle of word is found in the previous
line, otherwise nil"
(if (save-excursion
(beginning-of-line 0)
(search-forward-regexp "\\B\\\\\\B" (csound-util-line-boundry) t 1))
t nil))
(defun csound-indentation--current-line-empty-p ()
"returns t if the current line is empty, otherwise nil"
(and
(save-excursion
(beginning-of-line)
;; (looking-at-p "[[:blank:]]*$") ; is this a mistake?
(search-forward-regexp "[[:blank:]]*$" (csound-util-line-boundry)
t 1)) ; did you mean this instead?
;; don't account for line continuation token being empty
(not (and (csound-indentation--previous-line-breaks-p)
(csound-indentation--current-line-breaks-p)))))
(defun csound-indentation--pointer-inside-paren-p ()
"returns t when pointer is inside a parenthesis, otherwise nil"
(let* ((case-fold-search nil)
(last-open (save-excursion (search-backward-regexp "(" nil t)))
(last-closed (save-excursion (search-backward-regexp ")" nil t))))
(cond ((eq 'nil last-open) nil)
((and (numberp last-open) (eq 'nil last-closed)) t)
((< last-closed last-open) t)
(t nil))))
(defun csound-indentation--cursor-behind-indentation-point-p ()
"returns t if the cursor is behind an indentation point, which is
whitespace in the beginning of a line, otherwise nil"
(> (or
(save-excursion
(beginning-of-line)
;; (search-forward-regexp "^\\s-*" (csound-util-line-boundry) t
;; 1) ; is this a mistake?
(search-forward-regexp "^\\s-+" (csound-util-line-boundry) t
1)) ; did you mean this instead?
(point))
(point)))
(defun csound-indentation-begin-of-expr-p ()
"returns t when in the next line a instr or opcode block starts, otherwise nil"
(save-excursion
(beginning-of-line 1)
(search-forward-regexp "\\b\\(instr\\|opcode\\)\\b" (line-end-position 1) t)))
(defun csound-indentation-end-of-expr-p ()
"returns t when in the next line a instr or opcode block is closed, otherwise nil"
(save-excursion
(beginning-of-line 1)
(search-forward-regexp "\\b\\(endin\\|endop\\)\\b" (line-end-position 1) t)))
(defun csound-indentation-inside-instr-p ()
"returns t when point is inside a instr block, otherwise nil"
(let* ((case-fold-search nil)
(last-instr (save-excursion (search-backward-regexp "^\\s-*\\(instr\\)\\b" nil t)))
(last-endin (save-excursion (search-backward-regexp "^\\s-*\\(endin\\)\\b" nil t))))
(cond ((eq 'nil last-instr) nil)
((and (numberp last-instr) (eq 'nil last-endin)) t)
((< last-endin last-instr) t)
(t nil))))
(defun csound-indentation-inside-opcode-p ()
"returns t when point is inside a opcode block, otherwise nil"
(let* ((case-fold-search nil)
(last-opcode (save-excursion (search-backward-regexp "^\\s-*\\(opcode\\)\\b" nil t)))
(last-endop (save-excursion (search-backward-regexp "^\\s-*\\(endop\\)\\b" nil t))))
(cond ((eq 'nil last-opcode) nil)
((and (numberp last-opcode) (eq 'nil last-endop)) t)
((< last-endop last-opcode) t)
(t nil))))
(defun csound-indentation-beginning-of-bool-p ()
"returns 1 when the next line a boolean expressions starts but without a goto,
otherwise 0"
(save-excursion
(beginning-of-line 1)
(if (and (search-forward-regexp
"\\<\\(if\\|while\\|else\\|elseif\\|until\\)\\>"
(csound-util-line-boundry) t 1)
;; if in mix with gotos
;; dont have endif therefore
;; dont create logical blocks
(prog2
(beginning-of-line)
(not (search-forward-regexp "\\<\\(kgoto\\|igoto\\|goto\\)\\>" (csound-util-line-boundry) t 1))))
1 0)))
(defun csound-indentation-end-of-bool-p ()
"returns 1 when in the next line a boolean expresion is closed,
otherwise 0"
(save-excursion
(beginning-of-line 1)
(if (search-forward-regexp
"\\<\\(endif\\|od\\|else\\|elseif\\)\\>"
(csound-util-line-boundry) t 1)
1 0)))
;;; not needed
;; (defun csound-indentation-count-goto-if-mix
;; (end-of-expr cnt current-depth)
;; "if"
;; (if (or (> current-depth 50) (<= end-of-expr (point)))
;; ;; if curren-depth is > 50 or pointer is behind the end of the
;; ;; current instr or opcode block return cnt
;; cnt
;; ;; else do this
;; (prog2
;; (beginning-of-line 1) ;; go down one line
;; (if ;; if a if statement and a goto statement is found count
;; ;; upwards, if not return current cnt
;; (and (search-forward-regexp "\\<\\(if\\)\\>" (csound-util-line-boundry) t 1)
;; ;; (search-forward-regexp "\\<\\(goto\\)\\>"
;; ;; (csound-util-line-boundry) t
;; ;; 1)
;; ;; (search-forward-regexp "\\<\\(igoto\\|kgoto\\|goto\\)\\>"
;; ;; (csound-util-line-boundry) t
;; ;; 1)
;; (search-forward-regexp "\\<\\(kgoto\\|igoto\\|goto\\)\\>"
;; (csound-util-line-boundry) t
;; 1))
;; (csound-indentation-count-goto-if-mix end-of-expr (1+ cnt)
;; (1+ current-depth))
;; (csound-indentation-count-goto-if-mix end-of-expr cnt (1+ current-depth))))))
;;; this function is never used
;; (defun csound-indentation-expression-first-arg (expr-string non-comma-cnt initial-recur-p)
;; (let ((trimmed-str (csound-util-chomp expr-string)))
;; (let* ((beginning-of-delimination (string-match "[\s\t,]" trimmed-str 0))
;; (end-of-delimination (when beginning-of-delimination
;; (string-match "[^\s^\t^,]" trimmed-str beginning-of-delimination)))
;; (comma-inbetween (when end-of-delimination
;; (string-match-p ","
;; (substring-no-properties trimmed-str beginning-of-delimination
;; end-of-delimination))))
;; (next-form (when end-of-delimination
;; (substring-no-properties trimmed-str end-of-delimination (length trimmed-str))))
;; (next-beginning (string-match "[\s\t,]" next-form 0))
;; (next-end (when next-beginning
;; (string-match "[^\s^\t^,]" next-form next-beginning)))
;; (next-comma (when next-end
;; (string-match-p ","
;; (substring-no-properties next-form next-beginning next-end)))))
;; (if (or (not (= 0 non-comma-cnt))
;; (and initial-recur-p (not comma-inbetween) next-comma))
;; (substring-no-properties trimmed-str end-of-delimination
;; (or (string-match "[\s\|\t]" trimmed-str end-of-delimination)
;; (length trimmed-str)))
;; (when next-form
;; (csound-indentation-expression-first-arg
;; next-form
;; (if comma-inbetween non-comma-cnt (1+ non-comma-cnt)) nil))))))
;;; this functions is never used
;; (defun csound-indentation-line-break-indent ()
;; ;; If it's the second occourance in a row
;; (if (save-excursion
;; (beginning-of-line 0)
;; (csound-indentation-line-break-escape-p) ; this function
;; ; doesn't exists
;; )
;; (indent-line-to (save-excursion
;; (beginning-of-line 0)
;; (search-forward-regexp "[^\s^\t]" (line-end-position 1) t 1)
;; (1- (current-column))))
;; (let* ((assignment-operator (save-excursion
;; (beginning-of-line 0)
;; (search-forward-regexp "=" (csound-util-line-boundry) t 1)))
;; (paren-open (when assignment-operator
;; (save-excursion
;; (goto-char assignment-operator)
;; (search-forward-regexp "(" (csound-util-line-boundry) t 1)))))
;; (cond
;; ;; ivar = poscil( |ival, ival2)
;; ((and assignment-operator paren-open)
;; (indent-line-to (save-excursion
;; (goto-char paren-open)
;; (search-forward-regexp "[^\s^\t^(]" (csound-util-line-boundry) t 1)
;; (1- (current-column)))))
;; ;; ivar = |"coulbeanything"
;; ((and assignment-operator (not paren-open))
;; (indent-line-to (save-excursion
;; (goto-char assignment-operator)
;; (search-forward-regexp "[^\s^\t]" (csound-util-line-boundry) t 1)
;; (current-column))))
;; ;; First element that has comma after an element without comma
;; (t (let* ((first-arg
;; (csound-indentation-expression-first-arg
;; (csound-util-remove-comment-in-string
;; (buffer-substring-no-properties
;; (line-beginning-position 0)
;; (line-end-position 0)))
;; 0 t))
;; (first-arg-pos
;; (save-excursion
;; (beginning-of-line 0)
;; (search-forward first-arg (line-end-position 1) t 1)
;; (current-column))))
;; (if (and first-arg first-arg-pos)
;; (indent-line-to (- first-arg-pos (length first-arg)))
;; ;; Fallback, ident +2 from first non-whitespace char above
;; (indent-line-to
;; (save-excursion
;; (beginning-of-line 0)
;; (search-forward-regexp "[^\s^\t]" (csound-util-line-boundry) t 1)
;; (current-column))))))))))
(defun csound-indentation-inside-expression-calc (expr-type)
"calculates the indentation level for current line an indent it"
(let* ((beginning-of-expr (if (eq 'instr expr-type)
(save-excursion
(search-backward-regexp "\\s-*\\<\\(instr\\)\\b" nil t))
(save-excursion
(search-backward-regexp "\\s-*\\<\\(opcode\\)\\b" nil t))))
(end-of-expr (or (if (eq 'instr expr-type)
(save-excursion
(search-forward-regexp "\\s-*\\<\\(endin\\)\\b" nil t))
(save-excursion
(search-forward-regexp "\\s-*\\<\\(endop\\)\\b" nil t)))
(point-max)))
(ending-of-current-line (line-end-position))
(expression-to-point (replace-regexp-in-string
"\".*\"\\|;;.*\\|//.*" ""
(buffer-substring beginning-of-expr (line-end-position 1)) ))
(expression-to-line-above (buffer-substring beginning-of-expr (line-end-position 0)))
(count-if-statements (save-excursion
(csound-util-recursive-count
"\\<\\(if\\)\\((\\|\\>\\)"
expression-to-point 0)))
(goto-if-mix (save-excursion
(csound-util-recursive-count
"\\<if\\>.*\\<\\(goto\\|igoto\\|kgoto\\)\\>"
expression-to-point 0)))
;; (count-elseif-statements (recursive-count
;; "\\b\\(elseif\\)\\b" (buffer-substring beginning-of-expr
;; (line-end-position 1)) 0))
(count-endif-statements (csound-util-recursive-count "\\s-?\\(endif\\)\\s-?" expression-to-point 0))
(count-while-statements (csound-util-recursive-count "\\s-?\\(while\\)\\s-?" expression-to-point 0))
(count-od-statements (csound-util-recursive-count "\\<\\(od\\)\\>" expression-to-point 0))
;;(count-switch-statements (csound-util-recursive-count "\\s-?\\(switch\\)\\s-?" expression-to-point 0))
;;(count-endw-statements (csound-util-recursive-count "\\s-?\\(endsw\\)\\s-?" expression-to-point 0))
(count-multiline-string-open (csound-util-recursive-count "{{" expression-to-line-above 0))
(count-multiline-string-close (csound-util-recursive-count "}}" expression-to-point 0))
(after-goto-statement
(if csound-indentation-indent-goto
(if (and (string-match-p "\\<\\w*:\\b" expression-to-point)
(= 0 (- count-multiline-string-open count-multiline-string-close)))
1 0)
0))
(line-at-goto-statement
(if (and csound-indentation-indent-goto
(save-excursion
(beginning-of-line)
(search-forward-regexp "\\<\\w*\\:\\s-*$" (line-end-position 1) t 1)))
1 0))
(begin-of-bool-p (csound-indentation-beginning-of-bool-p))
(previous-line-break-adjust
(if (csound-indentation--previous-line-breaks-p)
1 0))
(unbalanced-parens
(if (csound-indentation--pointer-inside-paren-p)
1 0))
(unbalanced-parens-or-line-break
(if (or (eq 1 unbalanced-parens) (eq 1 previous-line-break-adjust))
1 0))
(tab-count (max 1 (1+ (- (+ count-if-statements
after-goto-statement
count-multiline-string-open
;; count-elseif-statements
count-while-statements
;;count-switch-statements
;;previous-line-break-adjust
unbalanced-parens-or-line-break)
count-endif-statements
count-od-statements
;;count-endw-statements
begin-of-bool-p
(if (> after-goto-statement 0) line-at-goto-statement 0)
goto-if-mix
count-multiline-string-close
;;end-of-bool-p
)))))
;; (message "topoint: %s" expression-to-point)
;; (message "bool-begin: %d, ods: %d, line-at-goto: %d, aft-goto: %d,
;; count-if: %d, count-endif: %d mix: %d mls: %d.%d unbalanced-parens: %d
;; tab-count: %d"
;; begin-of-bool-p
;; count-od-statements
;; line-at-goto-statement
;; after-goto-statement
;; count-if-statements
;; count-endif-statements
;; goto-if-mix
;; count-multiline-string-open
;; count-multiline-string-close
;; unbalanced-parens
;; tab-count)
;; (message "RES %d" (* csound-indentation-spaces tab-count))
;; ;;(message "str-open: %d str-close: %d " count-string-open count-string-close)
;; (message "multistr-open: %d multistr-close: %d " count-multiline-string-open count-multiline-string-close)
;; (when (and (eq 't end-of-bool-p) (not (eq 't begin-of-bool-p))) (indent-line-to (* csound-indentation-spaces (1- tab-count))))
(indent-line-to (* csound-indentation-spaces tab-count))))
(defun csound-indentation--for-each-line (start end fn)
(while (< (point) end)
(funcall fn)
(forward-line)))
(defun csound-indentation--do-indent ()
(let ((score-p (or (save-excursion (search-backward "<CsScore" nil t 1))
(string-match-p ".sco$" (buffer-name (current-buffer))))))
(cond
(score-p (if csound-indentation-aggressive-score
(csound-score-align-block)
(indent-line-to 0)))
((csound-indentation-begin-of-expr-p) (indent-line-to 0))
((csound-indentation-end-of-expr-p) (indent-line-to 0))
;; ((csound-indentation-line-break-escape-p) (csound-indentation-line-break-indent))
((csound-indentation-inside-instr-p) (csound-indentation-inside-expression-calc 'instr))
((csound-indentation-inside-opcode-p) (csound-indentation-inside-expression-calc 'opcode))
(t (indent-line-to 0)))))
(defun csound-indentation-line ()
"Indent current line."
(if (or (csound-indentation--current-line-empty-p)
(csound-indentation--cursor-behind-indentation-point-p))
(csound-indentation--do-indent)
(save-excursion (csound-indentation--do-indent))))
(provide 'csound-indentation)
;;; csound-indentation.el ends here