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emacs/lisp/progmodes/icon.el

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;;; icon.el --- mode for editing Icon code
;; Copyright (C) 1989, 2001-2012 Free Software Foundation, Inc.
;; Author: Chris Smith <csmith@convex.com>
;; Created: 15 Feb 89
;; Keywords: languages
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; A major mode for editing the Icon programming language.
;;; Code:
(defvar icon-mode-abbrev-table nil
"Abbrev table in use in Icon-mode buffers.")
(define-abbrev-table 'icon-mode-abbrev-table ())
(defvar icon-mode-map ()
"Keymap used in Icon mode.")
(if icon-mode-map
()
(let ((map (make-sparse-keymap "Icon")))
(setq icon-mode-map (make-sparse-keymap))
(define-key icon-mode-map "{" 'electric-icon-brace)
(define-key icon-mode-map "}" 'electric-icon-brace)
(define-key icon-mode-map "\e\C-h" 'mark-icon-function)
(define-key icon-mode-map "\e\C-a" 'beginning-of-icon-defun)
(define-key icon-mode-map "\e\C-e" 'end-of-icon-defun)
(define-key icon-mode-map "\e\C-q" 'indent-icon-exp)
(define-key icon-mode-map "\177" 'backward-delete-char-untabify)
(define-key icon-mode-map [menu-bar] (make-sparse-keymap "Icon"))
(define-key icon-mode-map [menu-bar icon]
(cons "Icon" map))
(define-key map [beginning-of-icon-defun] '("Beginning of function" . beginning-of-icon-defun))
(define-key map [end-of-icon-defun] '("End of function" . end-of-icon-defun))
(define-key map [comment-region] '("Comment Out Region" . comment-region))
(define-key map [indent-region] '("Indent Region" . indent-region))
(define-key map [indent-line] '("Indent Line" . icon-indent-command))
(put 'eval-region 'menu-enable 'mark-active)
(put 'comment-region 'menu-enable 'mark-active)
(put 'indent-region 'menu-enable 'mark-active)))
(defvar icon-mode-syntax-table nil
"Syntax table in use in Icon-mode buffers.")
(if icon-mode-syntax-table
()
(setq icon-mode-syntax-table (make-syntax-table))
(modify-syntax-entry ?\\ "\\" icon-mode-syntax-table)
(modify-syntax-entry ?# "<" icon-mode-syntax-table)
(modify-syntax-entry ?\n ">" icon-mode-syntax-table)
(modify-syntax-entry ?$ "." icon-mode-syntax-table)
(modify-syntax-entry ?/ "." icon-mode-syntax-table)
(modify-syntax-entry ?* "." icon-mode-syntax-table)
(modify-syntax-entry ?+ "." icon-mode-syntax-table)
(modify-syntax-entry ?- "." icon-mode-syntax-table)
(modify-syntax-entry ?= "." icon-mode-syntax-table)
(modify-syntax-entry ?% "." icon-mode-syntax-table)
(modify-syntax-entry ?< "." icon-mode-syntax-table)
(modify-syntax-entry ?> "." icon-mode-syntax-table)
(modify-syntax-entry ?& "." icon-mode-syntax-table)
(modify-syntax-entry ?| "." icon-mode-syntax-table)
(modify-syntax-entry ?\' "\"" icon-mode-syntax-table))
(defgroup icon nil
"Mode for editing Icon code."
:link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces)
:group 'languages)
(defcustom icon-indent-level 4
"Indentation of Icon statements with respect to containing block."
:type 'integer
:group 'icon)
(defcustom icon-brace-imaginary-offset 0
"Imagined indentation of a Icon open brace that actually follows a statement."
:type 'integer
:group 'icon)
(defcustom icon-brace-offset 0
"Extra indentation for braces, compared with other text in same context."
:type 'integer
:group 'icon)
(defcustom icon-continued-statement-offset 4
"Extra indent for Icon lines not starting new statements."
:type 'integer
:group 'icon)
(defcustom icon-continued-brace-offset 0
"Extra indent for Icon substatements that start with open-braces.
This is in addition to `icon-continued-statement-offset'."
:type 'integer
:group 'icon)
(defcustom icon-auto-newline nil
"Non-nil means automatically newline before and after braces Icon code.
This applies when braces are inserted."
:type 'boolean
:group 'icon)
(defcustom icon-tab-always-indent t
"Non-nil means TAB in Icon mode should always reindent the current line.
It will then reindent, regardless of where in the line point is
when the TAB command is used."
:type 'boolean
:group 'icon)
(defvar icon-imenu-generic-expression
'((nil "^[ \t]*procedure[ \t]+\\(\\sw+\\)[ \t]*(" 1))
"Imenu expression for Icon mode. See `imenu-generic-expression'.")
;;;###autoload
(define-derived-mode icon-mode prog-mode "Icon"
"Major mode for editing Icon code.
Expression and list commands understand all Icon brackets.
Tab indents for Icon code.
Paragraphs are separated by blank lines only.
Delete converts tabs to spaces as it moves back.
\\{icon-mode-map}
Variables controlling indentation style:
icon-tab-always-indent
Non-nil means TAB in Icon mode should always reindent the current line,
regardless of where in the line point is when the TAB command is used.
icon-auto-newline
Non-nil means automatically newline before and after braces
inserted in Icon code.
icon-indent-level
Indentation of Icon statements within surrounding block.
The surrounding block's indentation is the indentation
of the line on which the open-brace appears.
icon-continued-statement-offset
Extra indentation given to a substatement, such as the
then-clause of an if or body of a while.
icon-continued-brace-offset
Extra indentation given to a brace that starts a substatement.
This is in addition to `icon-continued-statement-offset'.
icon-brace-offset
Extra indentation for line if it starts with an open brace.
icon-brace-imaginary-offset
An open brace following other text is treated as if it were
this far to the right of the start of its line.
Turning on Icon mode calls the value of the variable `icon-mode-hook'
with no args, if that value is non-nil."
:abbrev-table icon-mode-abbrev-table
(set (make-local-variable 'paragraph-start) (concat "$\\|" page-delimiter))
(set (make-local-variable 'paragraph-separate) paragraph-start)
(set (make-local-variable 'indent-line-function) #'icon-indent-line)
(set (make-local-variable 'comment-start) "# ")
(set (make-local-variable 'comment-end) "")
(set (make-local-variable 'comment-start-skip) "# *")
(set (make-local-variable 'comment-indent-function) 'icon-comment-indent)
(set (make-local-variable 'indent-line-function) 'icon-indent-line)
;; font-lock support
(set (make-local-variable 'font-lock-defaults)
'((icon-font-lock-keywords
icon-font-lock-keywords-1 icon-font-lock-keywords-2)
nil nil ((?_ . "w")) beginning-of-defun
;; Obsoleted by Emacs 19.35 parse-partial-sexp's COMMENTSTOP.
;;(font-lock-comment-start-regexp . "#")
(font-lock-mark-block-function . mark-defun)))
;; imenu support
(set (make-local-variable 'imenu-generic-expression)
icon-imenu-generic-expression)
;; hideshow support
;; we start from the assertion that `hs-special-modes-alist' is autoloaded.
(unless (assq 'icon-mode hs-special-modes-alist)
(setq hs-special-modes-alist
(cons '(icon-mode "\\<procedure\\>" "\\<end\\>" nil
icon-forward-sexp-function)
hs-special-modes-alist))))
;; This is used by indent-for-comment to decide how much to
;; indent a comment in Icon code based on its context.
(defun icon-comment-indent ()
(if (looking-at "^#") 0 comment-column))
(defun electric-icon-brace (arg)
"Insert character and correct line's indentation."
(interactive "P")
(let (insertpos)
(if (and (not arg)
(eolp)
(or (save-excursion
(skip-chars-backward " \t")
(bolp))
(if icon-auto-newline
(progn (icon-indent-line) (newline) t)
nil)))
(progn
(insert last-command-event)
(icon-indent-line)
(if icon-auto-newline
(progn
(newline)
;; (newline) may have done auto-fill
(setq insertpos (- (point) 2))
(icon-indent-line)))
(save-excursion
(if insertpos (goto-char (1+ insertpos)))
(delete-char -1))))
(if insertpos
(save-excursion
(goto-char insertpos)
(self-insert-command (prefix-numeric-value arg)))
(self-insert-command (prefix-numeric-value arg)))))
(defun icon-indent-command (&optional whole-exp)
"Indent current line as Icon code, or in some cases insert a tab character.
If `icon-tab-always-indent' is non-nil (the default), always indent current
line. Otherwise, indent the current line only if point is at the left margin
or in the line's indentation; otherwise insert a tab.
A numeric argument, regardless of its value, means indent rigidly all the
lines of the expression starting after point so that this line becomes
properly indented. The relative indentation among the lines of the
expression are preserved."
(interactive "P")
(if whole-exp
;; If arg, always indent this line as Icon
;; and shift remaining lines of expression the same amount.
(let ((shift-amt (icon-indent-line))
beg end)
(save-excursion
(if icon-tab-always-indent
(beginning-of-line))
(setq beg (point))
(forward-sexp 1)
(setq end (point))
(goto-char beg)
(forward-line 1)
(setq beg (point)))
(if (> end beg)
(indent-code-rigidly beg end shift-amt "#")))
(if (and (not icon-tab-always-indent)
(save-excursion
(skip-chars-backward " \t")
(not (bolp))))
(insert-tab)
(icon-indent-line))))
(defun icon-indent-line ()
"Indent current line as Icon code.
Return the amount the indentation changed by."
(let ((indent (calculate-icon-indent nil))
beg shift-amt
(case-fold-search nil)
(pos (- (point-max) (point))))
(beginning-of-line)
(setq beg (point))
(cond ((eq indent nil)
(setq indent (current-indentation)))
((looking-at "^#")
(setq indent 0))
(t
(skip-chars-forward " \t")
(if (listp indent) (setq indent (car indent)))
(cond ((and (looking-at "else\\b")
(not (looking-at "else\\s_")))
(setq indent (save-excursion
(icon-backward-to-start-of-if)
(current-indentation))))
((or (= (following-char) ?})
(looking-at "end\\b"))
(setq indent (- indent icon-indent-level)))
((= (following-char) ?{)
(setq indent (+ indent icon-brace-offset))))))
(skip-chars-forward " \t")
(setq shift-amt (- indent (current-column)))
(if (zerop shift-amt)
(if (> (- (point-max) pos) (point))
(goto-char (- (point-max) pos)))
(delete-region beg (point))
(indent-to indent)
;; If initial point was within line's indentation,
;; position after the indentation. Else stay at same point in text.
(if (> (- (point-max) pos) (point))
(goto-char (- (point-max) pos))))
shift-amt))
(defun calculate-icon-indent (&optional parse-start)
"Return appropriate indentation for current line as Icon code.
In usual case returns an integer: the column to indent to.
Returns nil if line starts inside a string, t if in a comment."
(save-excursion
(beginning-of-line)
(let ((indent-point (point))
(case-fold-search nil)
state
containing-sexp
toplevel)
(if parse-start
(goto-char parse-start)
(setq toplevel (beginning-of-icon-defun)))
(while (< (point) indent-point)
(setq parse-start (point))
(setq state (parse-partial-sexp (point) indent-point 0))
(setq containing-sexp (car (cdr state))))
(cond ((or (nth 3 state) (nth 4 state))
;; return nil or t if should not change this line
(nth 4 state))
((and containing-sexp
(/= (char-after containing-sexp) ?{))
;; line is expression, not statement:
;; indent to just after the surrounding open.
(goto-char (1+ containing-sexp))
(current-column))
(t
(if toplevel
;; Outside any procedures.
(progn (icon-backward-to-noncomment (point-min))
(if (icon-is-continuation-line)
icon-continued-statement-offset 0))
;; Statement level.
(if (null containing-sexp)
(progn (beginning-of-icon-defun)
(setq containing-sexp (point))))
(goto-char indent-point)
;; Is it a continuation or a new statement?
;; Find previous non-comment character.
(icon-backward-to-noncomment containing-sexp)
;; Now we get the answer.
(if (icon-is-continuation-line)
;; This line is continuation of preceding line's statement;
;; indent icon-continued-statement-offset more than the
;; first line of the statement.
(progn
(icon-backward-to-start-of-continued-exp containing-sexp)
(+ icon-continued-statement-offset (current-column)
(if (save-excursion (goto-char indent-point)
(skip-chars-forward " \t")
(eq (following-char) ?{))
icon-continued-brace-offset 0)))
;; This line starts a new statement.
;; Position following last unclosed open.
(goto-char containing-sexp)
;; Is line first statement after an open-brace?
(or
;; If no, find that first statement and indent like it.
(save-excursion
(if (looking-at "procedure\\s ")
(forward-sexp 3)
(forward-char 1))
(while (progn (skip-chars-forward " \t\n")
(looking-at "#"))
;; Skip over comments following openbrace.
(forward-line 1))
;; The first following code counts
;; if it is before the line we want to indent.
(and (< (point) indent-point)
(current-column)))
;; If no previous statement,
;; indent it relative to line brace is on.
;; For open brace in column zero, don't let statement
;; start there too. If icon-indent-level is zero,
;; use icon-brace-offset + icon-continued-statement-offset
;; instead.
;; For open-braces not the first thing in a line,
;; add in icon-brace-imaginary-offset.
(+ (if (and (bolp) (zerop icon-indent-level))
(+ icon-brace-offset
icon-continued-statement-offset)
icon-indent-level)
;; Move back over whitespace before the openbrace.
;; If openbrace is not first nonwhite thing on the line,
;; add the icon-brace-imaginary-offset.
(progn (skip-chars-backward " \t")
(if (bolp) 0 icon-brace-imaginary-offset))
;; Get initial indentation of the line we are on.
(current-indentation))))))))))
;; List of words to check for as the last thing on a line.
;; If cdr is t, next line is a continuation of the same statement,
;; if cdr is nil, next line starts a new (possibly indented) statement.
(defconst icon-resword-alist
'(("by" . t) ("case" . t) ("create") ("do") ("dynamic" . t) ("else")
("every" . t) ("if" . t) ("global" . t) ("initial" . t)
("link" . t) ("local" . t) ("of") ("record" . t) ("repeat" . t)
("static" . t) ("then") ("to" . t) ("until" . t) ("while" . t)))
(defun icon-is-continuation-line ()
(let* ((ch (preceding-char))
(ch-syntax (char-syntax ch)))
(if (eq ch-syntax ?w)
(assoc (buffer-substring
(progn (forward-word -1) (point))
(progn (forward-word 1) (point)))
icon-resword-alist)
(not (memq ch '(0 ?\; ?\} ?\{ ?\) ?\] ?\" ?\' ?\# ?\, ?\. ?\n))))))
(defun icon-backward-to-noncomment (lim)
(let (opoint stop)
(while (not stop)
(skip-chars-backward " \t\n\f" lim)
(setq opoint (point))
(beginning-of-line)
(if (and (nth 5 (parse-partial-sexp (point) opoint))
(< lim (point)))
(search-backward "#")
(setq stop t)))))
(defun icon-backward-to-start-of-continued-exp (lim)
(if (memq (preceding-char) '(?\) ?\]))
(forward-sexp -1))
(beginning-of-line)
(skip-chars-forward " \t")
(cond
((<= (point) lim) (goto-char (1+ lim)))
((not (icon-is-continued-line)) 0)
((and (eq (char-syntax (following-char)) ?w)
(cdr
(assoc (buffer-substring (point)
(save-excursion (forward-word 1) (point)))
icon-resword-alist))) 0)
(t (end-of-line 0) (icon-backward-to-start-of-continued-exp lim))))
(defun icon-is-continued-line ()
(save-excursion
(end-of-line 0)
(icon-is-continuation-line)))
(defun icon-backward-to-start-of-if (&optional limit)
"Move to the start of the last \"unbalanced\" if."
(or limit (setq limit (save-excursion (beginning-of-icon-defun) (point))))
(let ((if-level 1)
(case-fold-search nil))
(while (not (zerop if-level))
(backward-sexp 1)
(cond ((looking-at "else\\b")
(setq if-level (1+ if-level)))
((looking-at "if\\b")
(setq if-level (1- if-level)))
((< (point) limit)
(setq if-level 0)
(goto-char limit))))))
(defun mark-icon-function ()
"Put mark at end of Icon function, point at beginning."
(interactive)
(push-mark (point))
(end-of-icon-defun)
(push-mark (point))
(beginning-of-line 0)
(beginning-of-icon-defun))
(defun beginning-of-icon-defun ()
"Go to the start of the enclosing procedure; return t if at top level."
(interactive)
(if (re-search-backward "^procedure\\s \\|^end[ \t\n]" (point-min) 'move)
(looking-at "e")
t))
(defun end-of-icon-defun ()
(interactive)
(if (not (bobp)) (forward-char -1))
(re-search-forward "\\(\\s \\|^\\)end\\(\\s \\|$\\)" (point-max) 'move)
(forward-word -1)
(forward-line 1))
(defun indent-icon-exp ()
"Indent each line of the Icon grouping following point."
(interactive)
(let ((indent-stack (list nil))
(contain-stack (list (point)))
(case-fold-search nil)
outer-loop-done inner-loop-done state ostate
this-indent last-depth
at-else at-brace
(opoint (point))
(next-depth 0))
(save-excursion
(forward-sexp 1))
(save-excursion
(setq outer-loop-done nil)
(while (and (not (eobp)) (not outer-loop-done))
(setq last-depth next-depth)
;; Compute how depth changes over this line
;; plus enough other lines to get to one that
;; does not end inside a comment or string.
;; Meanwhile, do appropriate indentation on comment lines.
(setq inner-loop-done nil)
(while (and (not inner-loop-done)
(not (and (eobp) (setq outer-loop-done t))))
(setq ostate state)
(setq state (parse-partial-sexp (point) (progn (end-of-line) (point))
nil nil state))
(setq next-depth (car state))
(if (or (nth 4 ostate))
(icon-indent-line))
(if (or (nth 3 state))
(forward-line 1)
(setq inner-loop-done t)))
(if (<= next-depth 0)
(setq outer-loop-done t))
(if outer-loop-done
nil
(while (> last-depth next-depth)
(setq indent-stack (cdr indent-stack)
contain-stack (cdr contain-stack)
last-depth (1- last-depth)))
(while (< last-depth next-depth)
(setq indent-stack (cons nil indent-stack)
contain-stack (cons nil contain-stack)
last-depth (1+ last-depth)))
(if (null (car contain-stack))
(setcar contain-stack (or (car (cdr state))
(save-excursion (forward-sexp -1)
(point)))))
(forward-line 1)
(skip-chars-forward " \t")
(if (eolp)
nil
(if (and (car indent-stack)
(>= (car indent-stack) 0))
;; Line is on an existing nesting level.
;; Lines inside parens are handled specially.
(if (/= (char-after (car contain-stack)) ?{)
(setq this-indent (car indent-stack))
;; Line is at statement level.
;; Is it a new statement? Is it an else?
;; Find last non-comment character before this line
(save-excursion
(setq at-else (looking-at "else\\W"))
(setq at-brace (= (following-char) ?{))
(icon-backward-to-noncomment opoint)
(if (icon-is-continuation-line)
;; Preceding line did not end in comma or semi;
;; indent this line icon-continued-statement-offset
;; more than previous.
(progn
(icon-backward-to-start-of-continued-exp (car contain-stack))
(setq this-indent
(+ icon-continued-statement-offset (current-column)
(if at-brace icon-continued-brace-offset 0))))
;; Preceding line ended in comma or semi;
;; use the standard indent for this level.
(if at-else
(progn (icon-backward-to-start-of-if opoint)
(setq this-indent (current-indentation)))
(setq this-indent (car indent-stack))))))
;; Just started a new nesting level.
;; Compute the standard indent for this level.
(let ((val (calculate-icon-indent
(if (car indent-stack)
(- (car indent-stack))))))
(setcar indent-stack
(setq this-indent val))))
;; Adjust line indentation according to its contents
(if (or (= (following-char) ?})
(looking-at "end\\b"))
(setq this-indent (- this-indent icon-indent-level)))
(if (= (following-char) ?{)
(setq this-indent (+ this-indent icon-brace-offset)))
;; Put chosen indentation into effect.
(or (= (current-column) this-indent)
(progn
(delete-region (point) (progn (beginning-of-line) (point)))
(indent-to this-indent)))
;; Indent any comment following the text.
(or (looking-at comment-start-skip)
(if (re-search-forward comment-start-skip (line-end-position) t)
(progn (indent-for-comment) (beginning-of-line))))))))))
(defconst icon-font-lock-keywords-1
(eval-when-compile
(list
;; Fontify procedure name definitions.
'("^[ \t]*\\(procedure\\)\\>[ \t]*\\(\\sw+\\)?"
(1 font-lock-builtin-face) (2 font-lock-function-name-face nil t))))
"Subdued level highlighting for Icon mode.")
(defconst icon-font-lock-keywords-2
(append
icon-font-lock-keywords-1
(eval-when-compile
(list
;; Fontify all type specifiers.
(cons
(regexp-opt '("null" "string" "co-expression" "table" "integer"
"cset" "set" "real" "file" "list") 'words)
'font-lock-type-face)
;; Fontify all keywords.
;;
(cons
(regexp-opt
'("break" "do" "next" "repeat" "to" "by" "else" "if" "not" "return"
"until" "case" "of" "while" "create" "every" "suspend" "default"
"fail" "record" "then") 'words)
'font-lock-keyword-face)
;; "end" "initial"
(cons (regexp-opt '("end" "initial") 'words)
'font-lock-builtin-face)
;; Fontify all system variables.
(cons
(regexp-opt
'("&allocated" "&ascii" "&clock" "&col" "&collections" "&column"
"&control" "&cset" "&current" "&date" "&dateline" "&digits" "&dump"
"&e" "&error" "&errornumber" "&errortext" "&errorvalue" "&errout"
"&eventcode" "&eventsource" "&eventvalue" "&fail" "&features"
"&file" "&host" "&input" "&interval" "&lcase" "&ldrag" "&letters"
"&level" "&line" "&lpress" "&lrelease" "&main" "&mdrag" "&meta"
"&mpress" "&mrelease" "&null" "&output" "&phi" "&pi" "&pos"
"&progname" "&random" "&rdrag" "&regions" "&resize" "&row"
"&rpress" "&rrelease" "&shift" "&source" "&storage" "&subject"
"&time" "&trace" "&ucase" "&version" "&window" "&x" "&y") t)
'font-lock-constant-face)
(cons ;; global local static declarations and link files
(concat
"^[ \t]*"
(regexp-opt '("global" "link" "local" "static") t)
"\\(\\sw+\\>\\)*")
'((1 font-lock-builtin-face)
(font-lock-match-c-style-declaration-item-and-skip-to-next
(goto-char (or (match-beginning 2) (match-end 1))) nil
(1 (if (match-beginning 2)
font-lock-function-name-face
font-lock-variable-name-face)))))
(cons ;; $define $elif $ifdef $ifndef $undef
(concat "^"
(regexp-opt'("$define" "$elif" "$ifdef" "$ifndef" "$undef") t)
"\\>[ \t]*\\([^ \t\n]+\\)?")
'((1 font-lock-builtin-face)
(4 font-lock-variable-name-face nil t)))
(cons ;; $dump $endif $else $include
(concat
"^" (regexp-opt'("$dump" "$endif" "$else" "$include") t) "\\>" )
'font-lock-builtin-face)
(cons ;; $warning $error
(concat "^" (regexp-opt '("$warning" "$error") t)
"\\>[ \t]*\\(.+\\)?")
'((1 font-lock-builtin-face) (3 font-lock-warning-face nil t))))))
"Gaudy level highlighting for Icon mode.")
(defvar icon-font-lock-keywords icon-font-lock-keywords-1
"Default expressions to highlight in `icon-mode'.")
;;;used by hs-minor-mode
(defun icon-forward-sexp-function (arg)
(if (< arg 0)
(beginning-of-icon-defun)
(end-of-icon-defun)
(forward-char -1)))
(provide 'icon)
;;; icon.el ends here
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