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1065 lines
38 KiB
EmacsLisp
1065 lines
38 KiB
EmacsLisp
;; C code editing commands for Emacs
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;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.
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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 1, or (at your option)
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;; 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; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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(defvar c-mode-abbrev-table nil
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"Abbrev table in use in C mode.")
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(define-abbrev-table 'c-mode-abbrev-table ())
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(defvar c-mode-map ()
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"Keymap used in C mode.")
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(if c-mode-map
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()
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(setq c-mode-map (make-sparse-keymap))
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(define-key c-mode-map "{" 'electric-c-brace)
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(define-key c-mode-map "}" 'electric-c-brace)
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(define-key c-mode-map ";" 'electric-c-semi)
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(define-key c-mode-map "#" 'electric-c-sharp-sign)
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(define-key c-mode-map ":" 'electric-c-terminator)
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(define-key c-mode-map "\e\C-h" 'mark-c-function)
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(define-key c-mode-map "\e\C-q" 'indent-c-exp)
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(define-key c-mode-map "\ea" 'c-beginning-of-statement)
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(define-key c-mode-map "\ee" 'c-end-of-statement)
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(define-key c-mode-map "\eq" 'c-fill-paragraph)
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(define-key c-mode-map "\177" 'backward-delete-char-untabify)
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(define-key c-mode-map "\t" 'c-indent-command))
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;; cmacexp is lame because it uses no preprocessor symbols.
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;; It isn't very extensible either -- hardcodes /lib/cpp.
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(autoload 'c-macro-expand "cmacexp"
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"Display the result of expanding all C macros occurring in the region.
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The expansion is entirely correct because it uses the C preprocessor."
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t)
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(defvar c-mode-syntax-table nil
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"Syntax table in use in C-mode buffers.")
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(if c-mode-syntax-table
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()
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(setq c-mode-syntax-table (make-syntax-table))
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(modify-syntax-entry ?\\ "\\" c-mode-syntax-table)
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(modify-syntax-entry ?/ ". 14" c-mode-syntax-table)
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(modify-syntax-entry ?* ". 23" c-mode-syntax-table)
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(modify-syntax-entry ?+ "." c-mode-syntax-table)
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(modify-syntax-entry ?- "." c-mode-syntax-table)
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(modify-syntax-entry ?= "." c-mode-syntax-table)
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(modify-syntax-entry ?% "." c-mode-syntax-table)
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(modify-syntax-entry ?< "." c-mode-syntax-table)
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(modify-syntax-entry ?> "." c-mode-syntax-table)
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(modify-syntax-entry ?& "." c-mode-syntax-table)
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(modify-syntax-entry ?| "." c-mode-syntax-table)
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(modify-syntax-entry ?\' "\"" c-mode-syntax-table))
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(defconst c-indent-level 2
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"*Indentation of C statements with respect to containing block.")
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(defconst c-brace-imaginary-offset 0
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"*Imagined indentation of a C open brace that actually follows a statement.")
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(defconst c-brace-offset 0
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"*Extra indentation for braces, compared with other text in same context.")
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(defconst c-argdecl-indent 5
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"*Indentation level of declarations of C function arguments.")
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(defconst c-label-offset -2
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"*Offset of C label lines and case statements relative to usual indentation.")
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(defconst c-continued-statement-offset 2
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"*Extra indent for lines not starting new statements.")
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(defconst c-continued-brace-offset 0
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"*Extra indent for substatements that start with open-braces.
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This is in addition to c-continued-statement-offset.")
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(defconst c-style-alist
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'(("GNU"
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(c-indent-level . 2)
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(c-argdecl-indent . 5)
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(c-brace-offset . 0)
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(c-label-offset . -2)
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(c-continued-statement-offset . 2))
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("K&R"
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(c-indent-level . 5)
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(c-argdecl-indent . 0)
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(c-brace-offset . -5)
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(c-label-offset . -5)
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(c-continued-statement-offset . 5))
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("BSD"
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(c-indent-level . 4)
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(c-argdecl-indent . 4)
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(c-brace-offset . -4)
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(c-label-offset . -4)
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(c-continued-statement-offset . 4))
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(C++
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(c-indent-level . 4)
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(c-continued-statement-offset . 4)
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(c-brace-offset . -4)
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(c-argdecl-indent . 0)
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(c-label-offset . -4)
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(c-auto-newline . t))
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("Whitesmith"
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(c-indent-level . 4)
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(c-argdecl-indent . 4)
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(c-brace-offset . 0)
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(c-label-offset . -4)
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(c-continued-statement-offset . 4))))
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(defconst c-auto-newline nil
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"*Non-nil means automatically newline before and after braces,
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and after colons and semicolons, inserted in C code.
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If you do not want a leading newline before braces then use:
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(define-key c-mode-map "{" 'electric-c-semi)")
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(defconst c-tab-always-indent t
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"*Non-nil means TAB in C mode should always reindent the current line,
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regardless of where in the line point is when the TAB command is used.")
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(defun set-c-style (&optional style)
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"Set up the c-mode style variables from the c-style variable or if
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STYLE argument is given, use that. It makes the c indentation style
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variables buffer local."
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(interactive)
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(let ((c-styles (mapcar 'car c-style-alist)))
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(if (interactive-p)
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(setq style
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(let ((style-string ; get style name with completion
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(completing-read
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(format "Set c mode indentation style to (default %s): "
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default-c-style)
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(vconcat c-styles)
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(function (lambda (arg) (memq arg c-styles)))
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)))
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(if (string-equal "" style-string)
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default-c-style
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(intern style-string))
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)))
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(setq style (or style c-style)) ; use c-style if style is nil
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(make-local-variable 'c-style)
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(if (memq style c-styles)
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(setq c-style style)
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(error "Bad c style: %s" style)
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)
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(message "c-style: %s" c-style)
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; finally, set the indentation style variables making each one local
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(mapcar (function (lambda (c-style-pair)
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(make-local-variable (car c-style-pair))
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(set (car c-style-pair)
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(cdr c-style-pair))))
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(cdr (assq c-style c-style-alist)))
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c-style
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)
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)
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(defun c-mode ()
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"Major mode for editing C code.
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Expression and list commands understand all C brackets.
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Tab indents for C code.
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Comments are delimited with /* ... */.
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Paragraphs are separated by blank lines only.
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Delete converts tabs to spaces as it moves back.
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\\{c-mode-map}
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Variables controlling indentation style:
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c-tab-always-indent
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Non-nil means TAB in C mode should always reindent the current line,
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regardless of where in the line point is when the TAB command is used.
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c-auto-newline
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Non-nil means automatically newline before and after braces,
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and after colons and semicolons, inserted in C code.
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c-indent-level
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Indentation of C statements within surrounding block.
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The surrounding block's indentation is the indentation
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of the line on which the open-brace appears.
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c-continued-statement-offset
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Extra indentation given to a substatement, such as the
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then-clause of an if or body of a while.
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c-continued-brace-offset
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Extra indentation given to a brace that starts a substatement.
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This is in addition to c-continued-statement-offset.
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c-brace-offset
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Extra indentation for line if it starts with an open brace.
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c-brace-imaginary-offset
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An open brace following other text is treated as if it were
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this far to the right of the start of its line.
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c-argdecl-indent
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Indentation level of declarations of C function arguments.
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c-label-offset
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Extra indentation for line that is a label, or case or default.
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Settings for K&R and BSD indentation styles are
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c-indent-level 5 8
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c-continued-statement-offset 5 8
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c-brace-offset -5 -8
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c-argdecl-indent 0 8
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c-label-offset -5 -8
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Turning on C mode calls the value of the variable c-mode-hook with no args,
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if that value is non-nil."
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(interactive)
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(kill-all-local-variables)
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(use-local-map c-mode-map)
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(setq major-mode 'c-mode)
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(setq mode-name "C")
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(setq local-abbrev-table c-mode-abbrev-table)
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(set-syntax-table c-mode-syntax-table)
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(make-local-variable 'paragraph-start)
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(setq paragraph-start (concat "^$\\|" page-delimiter))
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(make-local-variable 'paragraph-separate)
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(setq paragraph-separate paragraph-start)
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(make-local-variable 'paragraph-ignore-fill-prefix)
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(setq paragraph-ignore-fill-prefix t)
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(make-local-variable 'indent-line-function)
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(setq indent-line-function 'c-indent-line)
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(make-local-variable 'indent-region-function)
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(setq indent-region-function 'c-indent-region)
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(make-local-variable 'require-final-newline)
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(setq require-final-newline t)
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(make-local-variable 'comment-start)
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(setq comment-start "/* ")
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(make-local-variable 'comment-end)
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(setq comment-end " */")
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(make-local-variable 'comment-column)
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(setq comment-column 32)
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(make-local-variable 'comment-start-skip)
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(setq comment-start-skip "/\\*+ *")
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(make-local-variable 'comment-indent-hook)
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(setq comment-indent-hook 'c-comment-indent)
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(make-local-variable 'parse-sexp-ignore-comments)
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(setq parse-sexp-ignore-comments t)
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(run-hooks 'c-mode-hook))
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;; This is used by indent-for-comment
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;; to decide how much to indent a comment in C code
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;; based on its context.
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(defun c-comment-indent ()
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(if (looking-at "^/\\*")
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0 ;Existing comment at bol stays there.
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(let ((opoint (point)))
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(save-excursion
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(beginning-of-line)
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(cond ((looking-at "[ \t]*}[ \t]*\\($\\|/\\*\\)")
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;; A comment following a solitary close-brace
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;; should have only one space.
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(search-forward "}")
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(1+ (current-column)))
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((or (looking-at "^#[ \t]*endif[ \t]*")
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(looking-at "^#[ \t]*else[ \t]*"))
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7) ;2 spaces after #endif
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((progn
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(goto-char opoint)
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(skip-chars-backward " \t")
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(and (= comment-column 0) (bolp)))
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;; If comment-column is 0, and nothing but space
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;; before the comment, align it at 0 rather than 1.
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0)
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(t
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(max (1+ (current-column)) ;Else indent at comment column
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comment-column))))))) ; except leave at least one space.
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(defun c-fill-paragraph (&optional arg)
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"Like \\[fill-paragraph] but handle C comments.
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If point is inside a comment, the current paragraph of the comment
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is filled, preserving the comment indentation or line-starting decorations."
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(interactive "P")
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(let ((first-line
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(save-excursion
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(beginning-of-line)
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(skip-chars-forward " \t")
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(looking-at comment-start-skip))))
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(if (or first-line
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(eq (calculate-c-indent) t))
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;; Inside a comment: fill one comment paragraph.
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(let ((fill-prefix
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;; The prefix for each line of this paragraph
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;; is the appropriate part of the start of this line,
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;; up to the column at which text should be indented.
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(save-excursion
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(beginning-of-line)
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(if (looking-at "[ \t]*/\\*.*\\*/")
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(progn (re-search-forward comment-start-skip)
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(make-string (current-column) ?\ ))
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(if first-line (forward-line 1))
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(buffer-substring (point)
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(progn
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(move-to-column
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(calculate-c-indent-within-comment t)
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t)
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(point))))))
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(paragraph-start
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;; Lines containing just a comment start or just an end
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;; should not be filled into paragraphs they are next to.
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(concat paragraph-start
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"\\|^[ \t]*/\\*[ \t]*$\\|^[ \t]*\\*/[ \t]*$\\|^[^ \t/*]"))
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(paragraph-separate
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(concat paragraph-separate
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"\\|^[ \t]*/\\*[ \t]*$\\|^[ \t]*\\*/[ \t]*$\\|^[^ \t/*]")))
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(save-restriction
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;; Don't fill the comment together with the code following it.
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(narrow-to-region (point-min)
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(save-excursion
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(search-forward "*/" nil 'move)
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(forward-line 1)
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(point)))
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(fill-paragraph arg)
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(save-excursion
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(search-forward "*/")
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(beginning-of-line)
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(if (looking-at "[ \t]*\\*/")
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(delete-indentation)))))
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;; Outside of comments: do ordinary filling.
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(fill-paragraph arg))))
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(defun electric-c-brace (arg)
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"Insert character and correct line's indentation."
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(interactive "P")
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(let (insertpos)
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(if (and (not arg)
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(eolp)
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(or (save-excursion
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(skip-chars-backward " \t")
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(bolp))
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(if c-auto-newline (progn (c-indent-line) (newline) t) nil)))
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(progn
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(insert last-command-char)
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(c-indent-line)
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(if c-auto-newline
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(progn
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(newline)
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;; (newline) may have done auto-fill
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(setq insertpos (- (point) 2))
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(c-indent-line)))
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(save-excursion
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(if insertpos (goto-char (1+ insertpos)))
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(delete-char -1))))
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(if insertpos
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(save-excursion
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(goto-char insertpos)
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(self-insert-command (prefix-numeric-value arg)))
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(self-insert-command (prefix-numeric-value arg)))))
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(defun electric-c-sharp-sign (arg)
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"Insert character and correct line's indentation."
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(interactive "P")
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(if (save-excursion
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(skip-chars-backward " \t")
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(bolp))
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(let ((c-auto-newline nil))
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(electric-c-terminator arg))
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(self-insert-command (prefix-numeric-value arg))))
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(defun electric-c-semi (arg)
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"Insert character and correct line's indentation."
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(interactive "P")
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(if c-auto-newline
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(electric-c-terminator arg)
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(self-insert-command (prefix-numeric-value arg))))
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(defun electric-c-terminator (arg)
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"Insert character and correct line's indentation."
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(interactive "P")
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(let (insertpos (end (point)))
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(if (and (not arg) (eolp)
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(not (save-excursion
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(beginning-of-line)
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(skip-chars-forward " \t")
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(or (= (following-char) ?#)
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;; Colon is special only after a label, or case ....
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;; So quickly rule out most other uses of colon
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;; and do no indentation for them.
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(and (eq last-command-char ?:)
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(not (looking-at "case[ \t'/(]\\|default\\>"))
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(save-excursion
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(skip-chars-forward "a-zA-Z0-9_$")
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(skip-chars-forward " \t")
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(< (point) end)))
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(progn
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(beginning-of-defun)
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(let ((pps (parse-partial-sexp (point) end)))
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(or (nth 3 pps) (nth 4 pps) (nth 5 pps))))))))
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(progn
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(insert last-command-char)
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(c-indent-line)
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(and c-auto-newline
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(not (c-inside-parens-p))
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(progn
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(newline)
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;; (newline) may have done auto-fill
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(setq insertpos (- (point) 2))
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(c-indent-line)))
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(save-excursion
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(if insertpos (goto-char (1+ insertpos)))
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(delete-char -1))))
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(if insertpos
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(save-excursion
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(goto-char insertpos)
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(self-insert-command (prefix-numeric-value arg)))
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(self-insert-command (prefix-numeric-value arg)))))
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(defun c-inside-parens-p ()
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(condition-case ()
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(save-excursion
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(save-restriction
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(narrow-to-region (point)
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(progn (beginning-of-defun) (point)))
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(goto-char (point-max))
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(= (char-after (or (scan-lists (point) -1 1) (point-min))) ?\()))
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(error nil)))
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(defun c-indent-command (&optional whole-exp)
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"Indent current line as C code, or in some cases insert a tab character.
|
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If `c-tab-always-indent' is non-nil (the default), always indent current line.
|
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Otherwise, indent the current line only if point is at the left margin or
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in the line's indentation; otherwise insert a tab.
|
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A numeric argument, regardless of its value, means indent rigidly all the
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lines of the expression starting after point so that this line becomes
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properly indented. The relative indentation among the lines of the
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expression are preserved."
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(interactive "P")
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(if whole-exp
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;; If arg, always indent this line as C
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;; and shift remaining lines of expression the same amount.
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(let ((shift-amt (c-indent-line))
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beg end)
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(save-excursion
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(if c-tab-always-indent
|
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(beginning-of-line))
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;; Find beginning of following line.
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||
(save-excursion
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(forward-line 1) (setq beg (point)))
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||
;; Find first beginning-of-sexp for sexp extending past this line.
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||
(while (< (point) beg)
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||
(forward-sexp 1)
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(setq end (point))
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(skip-chars-forward " \t\n")))
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||
(if (> end beg)
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||
(indent-code-rigidly beg end shift-amt "#")))
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||
(if (and (not c-tab-always-indent)
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||
(save-excursion
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||
(skip-chars-backward " \t")
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||
(not (bolp))))
|
||
(insert-tab)
|
||
(c-indent-line))))
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|
||
(defun c-indent-line ()
|
||
"Indent current line as C code.
|
||
Return the amount the indentation changed by."
|
||
(let ((indent (calculate-c-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)))
|
||
((eq indent t)
|
||
(setq indent (calculate-c-indent-within-comment)))
|
||
((looking-at "[ \t]*#")
|
||
(setq indent 0))
|
||
(t
|
||
(skip-chars-forward " \t")
|
||
(if (listp indent) (setq indent (car indent)))
|
||
(cond ((or (looking-at "case[ \t'/(]\\|default\\>")
|
||
(and (looking-at "[A-Za-z]")
|
||
(save-excursion
|
||
(forward-sexp 1)
|
||
(looking-at ":"))))
|
||
(setq indent (max 1 (+ indent c-label-offset))))
|
||
((and (looking-at "else\\b")
|
||
(not (looking-at "else\\s_")))
|
||
(setq indent (save-excursion
|
||
(c-backward-to-start-of-if)
|
||
(current-indentation))))
|
||
((looking-at "}[ \t]*else")
|
||
(setq indent (save-excursion
|
||
(forward-char)
|
||
(backward-sexp)
|
||
(current-indentation))))
|
||
((and (looking-at "while\\b")
|
||
(save-excursion
|
||
(c-backward-to-start-of-do)))
|
||
;; This is a `while' that ends a do-while.
|
||
(setq indent (save-excursion
|
||
(c-backward-to-start-of-do)
|
||
(current-indentation))))
|
||
((= (following-char) ?})
|
||
(setq indent (- indent c-indent-level)))
|
||
((= (following-char) ?{)
|
||
(setq indent (+ indent c-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-c-indent (&optional parse-start)
|
||
"Return appropriate indentation for current line as C 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)
|
||
(if parse-start
|
||
(goto-char parse-start)
|
||
(beginning-of-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))
|
||
((null containing-sexp)
|
||
;; Line is at top level. May be data or function definition,
|
||
;; or may be function argument declaration.
|
||
;; Indent like the previous top level line
|
||
;; unless that ends in a closeparen without semicolon,
|
||
;; in which case this line is the first argument decl.
|
||
(goto-char indent-point)
|
||
(skip-chars-forward " \t")
|
||
(if (= (following-char) ?{)
|
||
0 ; Unless it starts a function body
|
||
(c-backward-to-noncomment (or parse-start (point-min)))
|
||
;; Look at previous line that's at column 0
|
||
;; to determine whether we are in top-level decls
|
||
;; or function's arg decls. Set basic-indent accordingly.
|
||
(let ((basic-indent
|
||
(save-excursion
|
||
(re-search-backward "^[^ \^L\t\n#]" nil 'move)
|
||
(if (and (looking-at "\\sw\\|\\s_")
|
||
(looking-at "[^\"\n=]*(")
|
||
(progn
|
||
(goto-char (1- (match-end 0)))
|
||
(forward-sexp 1)
|
||
(skip-chars-forward " \t\f")
|
||
(and (< (point) indent-point)
|
||
(not (memq (following-char)
|
||
'(?\, ?\;))))))
|
||
c-argdecl-indent 0))))
|
||
basic-indent)))
|
||
|
||
;; ;; Now add a little if this is a continuation line.
|
||
;; (+ basic-indent (if (or (bobp)
|
||
;; (memq (preceding-char) '(?\) ?\; ?\}))
|
||
;; ;; Line with zero indentation
|
||
;; ;; is probably the return-type
|
||
;; ;; of a function definition,
|
||
;; ;; so following line is function name.
|
||
;; (= (current-indentation) 0))
|
||
;; 0 c-continued-statement-offset))
|
||
|
||
((/= (char-after containing-sexp) ?{)
|
||
;; line is expression, not statement:
|
||
;; indent to just after the surrounding open.
|
||
(goto-char (1+ containing-sexp))
|
||
(current-column))
|
||
(t
|
||
;; Statement level. Is it a continuation or a new statement?
|
||
;; Find previous non-comment character.
|
||
(goto-char indent-point)
|
||
(c-backward-to-noncomment containing-sexp)
|
||
;; Back up over label lines, since they don't
|
||
;; affect whether our line is a continuation.
|
||
(while (or (eq (preceding-char) ?\,)
|
||
(and (eq (preceding-char) ?:)
|
||
(or (eq (char-after (- (point) 2)) ?\')
|
||
(memq (char-syntax (char-after (- (point) 2)))
|
||
'(?w ?_)))))
|
||
(if (eq (preceding-char) ?\,)
|
||
(progn (forward-char -1)
|
||
(c-backward-to-start-of-continued-exp containing-sexp)))
|
||
(beginning-of-line)
|
||
(c-backward-to-noncomment containing-sexp))
|
||
;; Check for a preprocessor statement or its continuation lines.
|
||
;; Move back to end of previous non-preprocessor line.
|
||
(let ((found (point)) stop)
|
||
(while (not stop)
|
||
(cond ((save-excursion (end-of-line 0)
|
||
(= (preceding-char) ?\\))
|
||
(end-of-line 0))
|
||
;; This line is not preceded by a backslash.
|
||
;; So either it starts a preprocessor command
|
||
;; or any following continuation lines
|
||
;; should not be skipped.
|
||
((progn (beginning-of-line) (= (following-char) ?#))
|
||
(end-of-line 0)
|
||
(setq found (point)))
|
||
(t (setq stop t))))
|
||
(goto-char found))
|
||
;; Now we get the answer.
|
||
(if (and (not (memq (preceding-char) '(nil ?\, ?\; ?\} ?\{)))
|
||
;; But don't treat a line with a close-brace
|
||
;; as a continuation. It is probably the
|
||
;; end of an enum type declaration.
|
||
(save-excursion
|
||
(goto-char indent-point)
|
||
(skip-chars-forward " \t")
|
||
(not (= (following-char) ?}))))
|
||
;; This line is continuation of preceding line's statement;
|
||
;; indent c-continued-statement-offset more than the
|
||
;; previous line of the statement.
|
||
(progn
|
||
(c-backward-to-start-of-continued-exp containing-sexp)
|
||
(+ c-continued-statement-offset (current-column)
|
||
(if (save-excursion (goto-char indent-point)
|
||
(skip-chars-forward " \t")
|
||
(eq (following-char) ?{))
|
||
c-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
|
||
(forward-char 1)
|
||
(let ((colon-line-end 0))
|
||
(while (progn (skip-chars-forward " \t\n")
|
||
(looking-at "#\\|/\\*\\|case[ \t\n'/(].*:\\|[a-zA-Z0-9_$]*:"))
|
||
;; Skip over comments and labels following openbrace.
|
||
(cond ((= (following-char) ?\#)
|
||
(forward-line 1))
|
||
((= (following-char) ?\/)
|
||
(forward-char 2)
|
||
(search-forward "*/" nil 'move))
|
||
;; case or label:
|
||
(t
|
||
(save-excursion (end-of-line)
|
||
(setq colon-line-end (point)))
|
||
(search-forward ":"))))
|
||
;; The first following code counts
|
||
;; if it is before the line we want to indent.
|
||
(and (< (point) indent-point)
|
||
(if (> colon-line-end (point))
|
||
(- (current-indentation) c-label-offset)
|
||
(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 c-indent-level is zero,
|
||
;; use c-brace-offset + c-continued-statement-offset instead.
|
||
;; For open-braces not the first thing in a line,
|
||
;; add in c-brace-imaginary-offset.
|
||
(+ (if (and (bolp) (zerop c-indent-level))
|
||
(+ c-brace-offset c-continued-statement-offset)
|
||
c-indent-level)
|
||
;; Move back over whitespace before the openbrace.
|
||
;; If openbrace is not first nonwhite thing on the line,
|
||
;; add the c-brace-imaginary-offset.
|
||
(progn (skip-chars-backward " \t")
|
||
(if (bolp) 0 c-brace-imaginary-offset))
|
||
;; If the openbrace is preceded by a parenthesized exp,
|
||
;; move to the beginning of that;
|
||
;; possibly a different line
|
||
(progn
|
||
(if (eq (preceding-char) ?\))
|
||
(forward-sexp -1))
|
||
;; Get initial indentation of the line we are on.
|
||
(current-indentation))))))))))
|
||
|
||
(defun calculate-c-indent-within-comment (&optional after-star)
|
||
"Return the indentation amount for line inside a block comment.
|
||
Optional arg AFTER-STAR means, if lines in the comment have a leading star,
|
||
return the indentation of the text that would follow this star."
|
||
(let (end star-start)
|
||
(save-excursion
|
||
(beginning-of-line)
|
||
(skip-chars-forward " \t")
|
||
(setq star-start (= (following-char) ?\*))
|
||
(skip-chars-backward " \t\n")
|
||
(setq end (point))
|
||
(beginning-of-line)
|
||
(skip-chars-forward " \t")
|
||
(if after-star
|
||
(and (looking-at "\\*")
|
||
(re-search-forward "\\*[ \t]*")))
|
||
(and (re-search-forward "/\\*[ \t]*" end t)
|
||
star-start
|
||
(not after-star)
|
||
(goto-char (1+ (match-beginning 0))))
|
||
(if (and (looking-at "[ \t]*$") (= (preceding-char) ?\*))
|
||
(1+ (current-column))
|
||
(current-column)))))
|
||
|
||
|
||
(defun c-backward-to-noncomment (lim)
|
||
(let (opoint stop)
|
||
(while (not stop)
|
||
(skip-chars-backward " \t\n\f" lim)
|
||
(setq opoint (point))
|
||
(if (and (>= (point) (+ 2 lim))
|
||
(save-excursion
|
||
(forward-char -2)
|
||
(looking-at "\\*/")))
|
||
(search-backward "/*" lim 'move)
|
||
(setq stop (or (<= (point) lim)
|
||
(save-excursion
|
||
(beginning-of-line)
|
||
(skip-chars-forward " \t")
|
||
(not (looking-at "#")))))
|
||
(or stop (beginning-of-line))))))
|
||
|
||
(defun c-backward-to-start-of-continued-exp (lim)
|
||
(if (memq (preceding-char) '(?\) ?\"))
|
||
(forward-sexp -1))
|
||
(beginning-of-line)
|
||
(if (<= (point) lim)
|
||
(goto-char (1+ lim)))
|
||
(skip-chars-forward " \t"))
|
||
|
||
(defun c-backward-to-start-of-if (&optional limit)
|
||
"Move to the start of the last \"unbalanced\" `if'."
|
||
(or limit (setq limit (save-excursion (beginning-of-defun) (point))))
|
||
(let ((if-level 1)
|
||
(case-fold-search nil))
|
||
(while (and (not (bobp)) (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 c-backward-to-start-of-do (&optional limit)
|
||
"If point follows a `do' statement, move to beginning of it and return t.
|
||
Otherwise return nil and don't move point."
|
||
(or limit (setq limit (save-excursion (beginning-of-defun) (point))))
|
||
(let ((first t)
|
||
(startpos (point))
|
||
(done nil))
|
||
(while (not done)
|
||
(let ((next-start (point)))
|
||
(condition-case nil
|
||
;; Move back one token or one brace or paren group.
|
||
(backward-sexp 1)
|
||
;; If we find an open-brace, we lose.
|
||
(error (setq done 'fail)))
|
||
(if done
|
||
nil
|
||
;; If we reached a `do', we win.
|
||
(if (looking-at "do\\b")
|
||
(setq done 'succeed)
|
||
;; Otherwise, if we skipped a semicolon, we lose.
|
||
;; (Exception: we can skip one semicolon before getting
|
||
;; to a the last token of the statement, unless that token
|
||
;; is a close brace.)
|
||
(if (save-excursion
|
||
(forward-sexp 1)
|
||
(or (and (not first) (= (preceding-char) ?}))
|
||
(search-forward ";" next-start t
|
||
(if (and first
|
||
(/= (preceding-char) ?}))
|
||
2 1))))
|
||
(setq done 'fail)
|
||
(setq first nil)
|
||
;; If we go too far back in the buffer, we lose.
|
||
(if (< (point) limit)
|
||
(setq done 'fail)))))))
|
||
(if (eq done 'succeed)
|
||
t
|
||
(goto-char startpos)
|
||
nil)))
|
||
|
||
(defun c-beginning-of-statement (count)
|
||
"Go to the beginning of the innermost C statement.
|
||
With prefix arg, go back N - 1 statements. If already at the beginning of a
|
||
statement then go to the beginning of the preceeding one."
|
||
(interactive "p")
|
||
(while (> count 0)
|
||
(c-beginning-of-statement-1)
|
||
(setq count (1- count)))
|
||
(while (< count 0)
|
||
(c-end-of-statement-1)
|
||
(setq count (1+ count))))
|
||
|
||
(defun c-end-of-statement (count)
|
||
"Go to the end of the innermost C statement.
|
||
With prefix arg, go forward N - 1 statements. Moves forward to end of the
|
||
next statement if already at end."
|
||
(interactive "p")
|
||
(c-beginning-of-statement (- count)))
|
||
|
||
(defun c-beginning-of-statement-1 ()
|
||
(let ((last-begin (point))
|
||
(first t))
|
||
(condition-case ()
|
||
(progn
|
||
(while (and (not (bobp))
|
||
(progn
|
||
(backward-sexp 1)
|
||
(or first
|
||
(not (re-search-forward "[;{}]" last-begin t)))))
|
||
(setq last-begin (point) first nil))
|
||
(goto-char last-begin))
|
||
(error (if first (backward-up-list 1) (goto-char last-begin))))))
|
||
|
||
(defun c-end-of-statement-1 ()
|
||
(condition-case ()
|
||
(progn
|
||
(while (and (not (eobp))
|
||
(let ((beg (point)))
|
||
(forward-sexp 1)
|
||
(let ((end (point)))
|
||
(save-excursion
|
||
(goto-char beg)
|
||
(not (re-search-forward "[;{}]" end t)))))))
|
||
(re-search-backward "[;}]")
|
||
(forward-char 1))
|
||
(error
|
||
(let ((beg (point)))
|
||
(backward-up-list -1)
|
||
(let ((end (point)))
|
||
(goto-char beg)
|
||
(search-forward ";" end 'move))))))
|
||
|
||
(defun mark-c-function ()
|
||
"Put mark at end of C function, point at beginning."
|
||
(interactive)
|
||
(push-mark (point))
|
||
(end-of-defun)
|
||
(push-mark (point))
|
||
(beginning-of-defun)
|
||
(backward-paragraph))
|
||
|
||
(defun indent-c-exp (&optional endpos)
|
||
"Indent each line of the C grouping following point.
|
||
If optional arg ENDPOS is given, indent each line, stopping when
|
||
ENDPOS is encountered."
|
||
(interactive)
|
||
(let* ((indent-stack (list nil))
|
||
(opoint (point)) ;; May be altered below.
|
||
(contain-stack
|
||
(list (if endpos
|
||
(let (funbeg)
|
||
;; Find previous fcn-start.
|
||
(save-excursion (forward-char 1)
|
||
(beginning-of-defun)
|
||
(setq funbeg (point)))
|
||
;; Try to find containing open,
|
||
;; but don't scan past that fcn-start.
|
||
(save-restriction
|
||
(narrow-to-region funbeg (point))
|
||
(condition-case nil
|
||
(save-excursion
|
||
(backward-up-list 1) (point))
|
||
;; We gave up: must be between fcns.
|
||
;; Set opoint to beg of prev fcn
|
||
;; since otherwise calculate-c-indent
|
||
;; will get wrong answers.
|
||
(error (setq opoint funbeg)
|
||
(point)))))
|
||
(point))))
|
||
(case-fold-search nil)
|
||
restart outer-loop-done inner-loop-done state ostate
|
||
this-indent last-sexp
|
||
at-else at-brace at-while
|
||
last-depth
|
||
(next-depth 0))
|
||
;; If the braces don't match, get an error right away.
|
||
(save-excursion
|
||
(forward-sexp 1))
|
||
;; Realign the comment on the first line, even though we don't reindent it.
|
||
(save-excursion
|
||
(let ((beg (point)))
|
||
(and (re-search-forward
|
||
comment-start-skip
|
||
(save-excursion (end-of-line) (point)) t)
|
||
;; Make sure the comment starter we found
|
||
;; is not actually in a string or quoted.
|
||
(let ((new-state
|
||
(parse-partial-sexp beg (point)
|
||
nil nil state)))
|
||
(and (not (nth 3 new-state)) (not (nth 5 new-state))))
|
||
(progn (indent-for-comment) (beginning-of-line)))))
|
||
(save-excursion
|
||
(setq outer-loop-done nil)
|
||
(while (and (not (eobp))
|
||
(if endpos (< (point) endpos)
|
||
(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 (and (car (cdr (cdr state)))
|
||
(>= (car (cdr (cdr state))) 0))
|
||
(setq last-sexp (car (cdr (cdr state)))))
|
||
(if (or (nth 4 ostate))
|
||
(c-indent-line))
|
||
(if (or (nth 3 state))
|
||
(forward-line 1)
|
||
(setq inner-loop-done t)))
|
||
(and endpos
|
||
(while (< next-depth 0)
|
||
(setq indent-stack (append indent-stack (list nil)))
|
||
(setq contain-stack (append contain-stack (list nil)))
|
||
(setq next-depth (1+ next-depth))
|
||
(setq last-depth (1+ last-depth))
|
||
(setcar (nthcdr 6 state) (1+ (nth 6 state)))))
|
||
(setq outer-loop-done (and (not endpos) (<= next-depth 0)))
|
||
(if outer-loop-done
|
||
nil
|
||
;; If this line had ..))) (((.. in it, pop out of the levels
|
||
;; that ended anywhere in this line, even if the final depth
|
||
;; doesn't indicate that they ended.
|
||
(while (> last-depth (nth 6 state))
|
||
(setq indent-stack (cdr indent-stack)
|
||
contain-stack (cdr contain-stack)
|
||
last-depth (1- last-depth)))
|
||
(if (/= last-depth next-depth)
|
||
(setq last-sexp nil))
|
||
;; Add levels for any parens that were started in this line.
|
||
(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) ?{))
|
||
(setq at-while (looking-at "while\\b"))
|
||
(c-backward-to-noncomment opoint)
|
||
(if (not (memq (preceding-char) '(nil ?\, ?\; ?} ?: ?{)))
|
||
;; Preceding line did not end in comma or semi;
|
||
;; indent this line c-continued-statement-offset
|
||
;; more than previous.
|
||
(progn
|
||
(c-backward-to-start-of-continued-exp (car contain-stack))
|
||
(setq this-indent
|
||
(+ c-continued-statement-offset (current-column)
|
||
(if at-brace c-continued-brace-offset 0))))
|
||
;; Preceding line ended in comma or semi;
|
||
;; use the standard indent for this level.
|
||
(cond (at-else (progn (c-backward-to-start-of-if opoint)
|
||
(setq this-indent
|
||
(current-indentation))))
|
||
((and at-while (c-backward-to-start-of-do opoint))
|
||
(setq this-indent (current-indentation)))
|
||
(t (setq this-indent (car indent-stack)))))))
|
||
;; Just started a new nesting level.
|
||
;; Compute the standard indent for this level.
|
||
(let ((val (calculate-c-indent
|
||
(if (car indent-stack)
|
||
(- (car indent-stack))
|
||
opoint))))
|
||
(setcar indent-stack
|
||
(setq this-indent val))))
|
||
;; Adjust line indentation according to its contents
|
||
(if (or (looking-at "case[ \t'/(]\\|default\\>")
|
||
(and (looking-at "[A-Za-z]")
|
||
(save-excursion
|
||
(forward-sexp 1)
|
||
(looking-at ":"))))
|
||
(setq this-indent (max 1 (+ this-indent c-label-offset))))
|
||
(if (= (following-char) ?})
|
||
(setq this-indent (- this-indent c-indent-level)))
|
||
(if (= (following-char) ?{)
|
||
(setq this-indent (+ this-indent c-brace-offset)))
|
||
;; Don't leave indentation in empty lines.
|
||
(if (eolp) (setq this-indent 0))
|
||
;; Put chosen indentation into effect.
|
||
(or (= (current-column) this-indent)
|
||
(= (following-char) ?\#)
|
||
(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)
|
||
(let ((beg (point)))
|
||
(and (re-search-forward
|
||
comment-start-skip
|
||
(save-excursion (end-of-line) (point)) t)
|
||
;; Make sure the comment starter we found
|
||
;; is not actually in a string or quoted.
|
||
(let ((new-state
|
||
(parse-partial-sexp beg (point)
|
||
nil nil state)))
|
||
(and (not (nth 3 new-state)) (not (nth 5 new-state))))
|
||
(progn (indent-for-comment) (beginning-of-line)))))))))))
|
||
|
||
;; Look at all comment-start strings in the current line after point.
|
||
;; Return t if one of them starts a real comment.
|
||
;; This is not used yet, because indent-for-comment
|
||
;; isn't smart enough to handle the cases this can find.
|
||
(defun indent-c-find-real-comment ()
|
||
(let (win)
|
||
(while (and (not win)
|
||
(re-search-forward comment-start-skip
|
||
(save-excursion (end-of-line) (point))
|
||
t))
|
||
;; Make sure the comment start is not quoted.
|
||
(let ((state-1
|
||
(parse-partial-sexp
|
||
(save-excursion (beginning-of-line) (point))
|
||
(point) nil nil state)))
|
||
(setq win (and (null (nth 3 state-1)) (null (nth 5 state-1))))))
|
||
win))
|
||
|
||
;; Indent every line whose first char is between START and END inclusive.
|
||
(defun c-indent-region (start end)
|
||
(save-excursion
|
||
(goto-char start)
|
||
(let ((endmark (copy-marker end)))
|
||
(and (bolp) (not (eolp))
|
||
(c-indent-line))
|
||
(indent-c-exp endmark)
|
||
(set-marker endmark nil))))
|
||
|
||
(defun set-c-style (style)
|
||
"Set C-mode variables to use one of several different indentation styles.
|
||
Takes one argument, a string representing the desired style.
|
||
Available styles are GNU, K&R, BSD and Whitesmith."
|
||
(interactive (list (completing-read "Use which C indentation style? "
|
||
c-style-alist nil t)))
|
||
(let ((vars (cdr (assoc style c-style-alist))))
|
||
(if vars
|
||
(if (interactive-p) (message "Using %s C indentation style" style))
|
||
(error "Bogus style type, \"%s\"" style))
|
||
(while vars
|
||
(set (car (car vars)) (cdr (car vars)))
|
||
(setq vars (cdr vars)))))
|