1 ;;; align.el --- align text to a specific column, by regexp
3 ;; Copyright (C) 1999, 2000, 2002 Free Sofware Foundation
5 ;; Author: John Wiegley <johnw@gnu.org>
6 ;; Keywords: convenience languages lisp
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
27 ;; This mode allows you to align regions in a context-sensitive fashion.
28 ;; The classic use is to align assignments:
42 ;; There are several variables which define how certain "categories"
43 ;; of syntax are to be treated. These variables go by the name
44 ;; `align-CATEGORY-modes'. For example, "c++" is such a category.
45 ;; There are several rules which apply to c++, but since several other
46 ;; languages have a syntax similar to c++ (e.g., c, java, etc), these
47 ;; modes are treated as belonging to the same category.
49 ;; If you want to add a new mode under a certain category, just
50 ;; customize that list, or add the new mode manually. For example, to
51 ;; make jde-mode a c++ category mode, use this code in your .emacs
54 ;; (setq align-c++-modes (cons 'jde-mode align-c++-modes))
56 ;; In some programming modes, it's useful to have the aligner run only
57 ;; after indentation is performed. To achieve this, customize or set
58 ;; the variable `align-indent-before-aligning' to t.
62 ;; In order to incorporate align's functionality into your own
63 ;; modules, there are only a few steps you have to follow.
65 ;; 1. Require or load in the align.el library.
67 ;; 2. Define your alignment and exclusion rules lists, either
68 ;; customizable or not.
70 ;; 3. In your mode function, set the variables
71 ;; `align-mode-rules-list' and `align-mode-exclude-rules-list'
72 ;; to your own rules lists.
74 ;; If there is any need to add your mode name to one of the
75 ;; align-?-modes variables (for example, `align-dq-string-modes'), use
76 ;; `add-to-list', or some similar function which checks first to see
77 ;; if the value is already there. Since the user may customize that
78 ;; mode list, and then write your mode name into their .emacs file,
79 ;; causing the symbol already to be present the next time they load
86 ;; (defcustom my-align-rules-list
88 ;; (regexp . "Sample")))
89 ;; :type align-rules-list-type
90 ;; :group 'my-package)
92 ;; (put 'my-align-rules-list 'risky-local-variable t)
94 ;; (add-to-list 'align-dq-string-modes 'my-package-mode)
95 ;; (add-to-list 'align-open-comment-modes 'my-package-mode)
99 ;; (setq align-mode-rules-list my-align-rules-list))
101 ;; Note that if you need to install your own exclusion rules, then you
102 ;; will also need to reproduce any double-quoted string, or open
103 ;; comment exclusion rules that are defined in the standard
104 ;; `align-exclude-rules-list'. At the moment there is no convenient
105 ;; way to mix both mode-local and global rules lists.
109 ;; Version 1.0 was created in the earlier part of 1996, using a very
110 ;; simple algorithm that understand only basic regular expressions.
111 ;; Parts of the code were broken up and included in vhdl-mode.el
112 ;; around this time. After several comments from users, and a need to
113 ;; find a more robust, performant algorithm, 2.0 was born in late
114 ;; 1998. Many different approaches were taken (mostly due to the
115 ;; complexity of TeX tables), but finally a scheme was discovered
116 ;; which worked fairly well for most common usage cases. Development
117 ;; beyond version 2.8 is not planned, except for problems that users
123 "Align text to a specific column, by regexp."
128 (defcustom align-load-hook nil
129 "*Hook that gets run after the aligner has been loaded."
133 (defcustom align-indent-before-aligning nil
134 "*If non-nil, indent the marked region before aligning it."
138 (defcustom align-default-spacing 1
139 "*An integer that represents the default amount of padding to use.
140 If `align-to-tab-stop' is non-nil, this will represent the number of
141 tab stops to use for alignment, rather than the number of spaces.
142 Each alignment rule can optionally override both this variable. See
147 (defcustom align-to-tab-stop 'indent-tabs-mode
148 "*If non-nil, alignments will always fall on a tab boundary.
149 It may also be a symbol, whose value will be taken."
150 :type '(choice (const nil) symbol)
153 (defcustom align-region-heuristic 500
154 "*If non-nil, used as a heuristic by `align-current'.
155 Since each alignment rule can possibly have its own set of alignment
156 sections (whenever `align-region-separate' is non-nil, and not a
157 string), this heuristic is used to determine how far before and after
158 point we should search in looking for a region separator. Larger
159 values can mean slower perform in large files, although smaller values
160 may cause unexpected behavior at times."
164 (defcustom align-highlight-change-face 'highlight
165 "*The face to highlight with if changes are necessary."
169 (defcustom align-highlight-nochange-face 'secondary-selection
170 "*The face to highlight with if no changes are necessary."
174 (defcustom align-large-region 10000
175 "*If an integer, defines what constitutes a \"large\" region.
176 If nil,then no messages will ever be printed to the minibuffer."
180 (defcustom align-c++-modes '(c++-mode c-mode java-mode)
181 "*A list of modes whose syntax resembles C/C++."
182 :type '(repeat symbol)
185 (defcustom align-perl-modes '(perl-mode cperl-mode)
186 "*A list of modes where perl syntax is to be seen."
187 :type '(repeat symbol)
190 (defcustom align-lisp-modes
191 '(emacs-lisp-mode lisp-interaction-mode lisp-mode scheme-mode)
192 "*A list of modes whose syntax resembles Lisp."
193 :type '(repeat symbol)
196 (defcustom align-tex-modes
197 '(tex-mode plain-tex-mode latex-mode slitex-mode)
198 "*A list of modes whose syntax resembles TeX (and family)."
199 :type '(repeat symbol)
202 (defcustom align-text-modes '(text-mode outline-mode)
203 "*A list of modes whose content is plain text."
204 :type '(repeat symbol)
207 (defcustom align-dq-string-modes
208 (append align-lisp-modes align-c++-modes align-perl-modes
210 "*A list of modes where double quoted strings should be excluded."
211 :type '(repeat symbol)
214 (defcustom align-sq-string-modes
215 (append align-perl-modes '(python-mode))
216 "*A list of modes where single quoted strings should be excluded."
217 :type '(repeat symbol)
220 (defcustom align-open-comment-modes
221 (append align-lisp-modes align-c++-modes align-perl-modes
222 '(python-mode makefile-mode))
223 "*A list of modes with a single-line comment syntax.
224 These are comments as in Lisp, which have a beginning but, end with
225 the line (i.e., `comment-end' is an empty string)."
226 :type '(repeat symbol)
229 (defcustom align-region-separate "^\\s-*[{}]?\\s-*$"
230 "*Select the method by which alignment sections will be separated.
231 If this is a symbol, that symbol's value will be used.
233 For the sake of clarification, consider the following example, which
234 will be referred to in the descriptions below.
236 int alpha = 1; /* one */
238 long gamma; /* ten */
240 unsigned int delta = 1; /* one */
241 long double epsilon = 3.0;
242 long long omega; /* ten */
244 The possible settings for `align-region-separate' are:
246 `entire' The entire region being aligned will be considered as a
247 single alignment section. Assuming that comments were not
248 being aligned to a particular column, the example would
251 int alpha = 1; /* one */
253 long gamma; /* ten */
255 unsigned int delta = 1; /* one */
257 long long chi = 10; /* ten */
259 `group' Each contiguous set of lines where a specific alignment
260 occurs is considered a section for that alignment rule.
261 Note that each rule will may have any entirely different
262 set of section divisions than another.
264 int alpha = 1; /* one */
266 long gamma; /* ten */
268 unsigned int delta = 1; /* one */
270 long long chi = 10; /* ten */
272 `largest' When contiguous rule sets overlap, the largest section
273 described will be taken as the alignment section for each
274 rule touched by that section.
276 int alpha = 1; /* one */
278 long gamma; /* ten */
280 unsigned int delta = 1; /* one */
282 long long chi = 10; /* ten */
284 NOTE: This option is not supported yet, due to algorithmic
285 issues which haven't been satisfactorily resolved. There
286 are ways to do it, but they're both ugly and resource
289 regexp A regular expression string which defines the section
290 divider. If the mode you're in has a consistent divider
291 between sections, the behavior will be very similar to
292 `largest', and faster. But if the mode does not use clear
293 separators (for example, if you collapse your braces onto
294 the preceding statement in C or perl), `largest' is
295 probably the better alternative.
297 function A function that will be passed the beginning and ending
298 locations of the region in which to look for the section
299 separator. At the very beginning of the attempt to align,
300 both of these parameters will be nil, in which case the
301 function should return non-nil if it wants each rule to
302 define its own section, or nil if it wants the largest
303 section found to be used as the common section for all rules
306 list A list of markers within the buffer that represent where
307 the section dividers lie. Be certain to use markers! For
308 when the aligning begins, the ensuing contract/expanding of
309 whitespace will throw off any non-marker positions.
311 This method is intended for use in Lisp programs, and not
314 (const :tag "Entire region is one section" entire)
315 (const :tag "Align by contiguous groups" group)
317 (regexp :tag "Regexp defines section boundaries")
318 (function :tag "Function defines section boundaries"))
321 (put 'align-region-separate 'risky-local-variable t)
323 (defvar align-rules-list-type
326 :tag "Alignment rule"
327 (symbol :tag "Title")
328 (cons :tag "Required attributes"
330 (const :tag "(Regular expression to match)" regexp)
331 (choice :value "\\(\\s-+\\)" regexp function))
333 :tag "Optional attributes"
336 (const :tag "(Repeat this rule throughout line)"
339 (cons :tag "Paren group"
340 (const :tag "(Parenthesis group to use)" group)
342 integer (repeat integer)))
344 (const :tag "(Modes where this rule applies)" modes)
345 (sexp :value (text-mode)))
346 (cons :tag "Case-fold"
347 (const :tag "(Should case be ignored for this rule)"
350 (cons :tag "To Tab Stop"
351 (const :tag "(Should rule align to tab stops)"
353 (boolean :value nil))
355 (const :tag "(Return non-nil if rule is valid)"
359 (const :tag "(Return non-nil if rule should run)"
363 (const :tag "(Column to fix alignment at)" column)
364 (choice :value comment-column
367 (const :tag "(Amount of spacing to use)" spacing)
370 (const :tag "(Should text be right justified)"
373 ;; make sure this stays up-to-date with any changes
374 ;; in `align-region-separate'
375 (cons :tag "Separate"
376 (const :tag "(Separation to use for this rule)"
378 (choice :value "^\\s-*$"
382 regexp function)))))))
383 "The `type' form for any `align-rules-list' variable.")
385 (unless (functionp 'c-guess-basic-syntax)
386 (autoload 'c-guess-basic-syntax "cc-engine"))
388 (defcustom align-rules-list
390 (regexp . "\\(^\\s-+[^( \t\n]\\|(\\(\\S-+\\)\\s-+\\)\\S-+\\(\\s-+\\)")
392 (modes . align-lisp-modes)
393 (run-if . ,(function (lambda () current-prefix-arg))))
396 (regexp . "\\(\\s-*\\)\\.\\(\\s-*\\)")
398 (modes . align-lisp-modes))
402 (lambda (end reverse)
403 (funcall (if reverse 're-search-backward
405 (concat "[^ \t\n\\\\]"
406 (regexp-quote comment-start)
407 "\\(.+\\)$") end t))))
408 (modes . align-open-comment-modes))
411 (regexp . "^\\s-*#\\s-*define\\s-+\\S-+\\(\\s-+\\)")
412 (modes . align-c++-modes))
414 (c-variable-declaration
415 (regexp . ,(concat "[*&0-9A-Za-z_]>?[&*]*\\(\\s-+[*&]*\\)"
416 "[A-Za-z_][0-9A-Za-z:_]*\\s-*\\(\\()\\|"
417 "=[^=\n].*\\|(.*)\\|\\(\\[.*\\]\\)*\\)?"
418 "\\s-*[;,]\\|)\\s-*$\\)"))
420 (modes . align-c++-modes)
425 (not (or (save-excursion
426 (goto-char (match-beginning 1))
429 "\\(goto\\|return\\|new\\|delete\\|throw\\)"))
430 (if (and (boundp 'font-lock-mode) font-lock-mode)
431 (eq (get-text-property (point) 'face)
432 'font-lock-comment-face)
433 (eq (caar (c-guess-basic-syntax)) 'c))))))))
436 (regexp . ,(concat "[^-=!^&*+<>/| \t\n]\\(\\s-*[-=!^&*+<>/|]*\\)"
437 "=\\(\\s-*\\)\\([^= \t\n]\\|$\\)"))
439 (modes . align-c++-modes)
444 (regexp . ,(concat "[^=!^&*-+<>/| \t\n]\\(\\s-*\\)=[~>]?"
445 "\\(\\s-*\\)\\([^>= \t\n]\\|$\\)"))
447 (modes . align-perl-modes)
451 (regexp . ,(concat "[^=!<> \t\n]\\(\\s-*\\)="
452 "\\(\\s-*\\)\\([^>= \t\n]\\|$\\)"))
454 (modes . '(python-mode))
458 (regexp . "^\\s-*\\w+\\(\\s-*\\):?=\\(\\s-*\\)\\([^\t\n \\\\]\\|$\\)")
460 (modes . '(makefile-mode))
464 (regexp . ",\\(\\s-*\\)[^/ \t\n]")
466 (modes . align-c++-modes)
467 (run-if . ,(function (lambda () current-prefix-arg))))
471 ; (memq (caar (c-guess-basic-syntax))
474 ; brace-entry-open))))))
476 ;; With a prefix argument, comma delimiter will be aligned. Since
477 ;; perl-mode doesn't give us enough syntactic information (and we
478 ;; don't do our own parsing yet), this rule is too destructive to
480 (basic-comma-delimiter
481 (regexp . ",\\(\\s-*\\)[^# \t\n]")
483 (modes . (append align-perl-modes '(python-mode)))
484 (run-if . ,(function (lambda () current-prefix-arg))))
487 (regexp . "\\(\\s-*\\)\\(//.*\\|/\\*.*\\*/\\s-*\\)$")
488 (modes . align-c++-modes)
489 (column . comment-column)
493 (goto-char (match-beginning 1))
497 (regexp . "\\(\\s-*\\)\\(&&\\|||\\|\\<and\\>\\|\\<or\\>\\)")
498 (modes . align-c++-modes)
502 (goto-char (match-end 2))
503 (looking-at "\\s-*\\(/[*/]\\|$\\)"))))))
506 (regexp . "\\(\\s-*\\)\\(&&\\|||\\|\\<and\\>\\|\\<or\\>\\)")
507 (modes . align-perl-modes)
511 (goto-char (match-end 2))
512 (looking-at "\\s-*\\(#\\|$\\)"))))))
515 (regexp . "\\(\\s-*\\)\\(\\<and\\>\\|\\<or\\>\\)")
516 (modes . '(python-mode))
520 (goto-char (match-end 2))
521 (looking-at "\\s-*\\(#\\|$\\|\\\\\\)"))))))
523 (c-macro-line-continuation
524 (regexp . "\\(\\s-*\\)\\\\$")
525 (modes . align-c++-modes)
526 (column . c-backslash-column))
530 ; (memq (caar (c-guess-basic-syntax))
531 ; '(cpp-macro cpp-macro-cont))))))
533 (basic-line-continuation
534 (regexp . "\\(\\s-*\\)\\\\$")
535 (modes . '(python-mode makefile-mode)))
537 (tex-record-separator
539 (lambda (end reverse)
540 (align-match-tex-pattern "&" end reverse))))
542 (modes . align-tex-modes)
545 (tex-tabbing-separator
547 (lambda (end reverse)
548 (align-match-tex-pattern "\\\\[=>]" end reverse))))
550 (modes . align-tex-modes)
554 (eq major-mode 'latex-mode)))))
557 (regexp . "\\(\\s-*\\)\\\\\\\\")
558 (modes . align-tex-modes))
560 ;; With a numeric prefix argument, or C-u, space delimited text
561 ;; tables will be aligned.
563 (regexp . "\\(^\\|\\S-\\)\\(\\s-+\\)\\(\\S-\\|$\\)")
565 (modes . align-text-modes)
569 (and current-prefix-arg
570 (not (eq '- current-prefix-arg)))))))
572 ;; With a negative prefix argument, lists of dollar figures will
575 (regexp . "\\$?\\(\\s-+[0-9]+\\)\\.")
576 (modes . align-text-modes)
580 (eq '- current-prefix-arg))))))
581 "*A list describing all of the available alignment rules.
585 (ATTRIBUTE . VALUE) ...)
588 The following attributes are meaningful:
590 `regexp' This required attribute must be either a string describing
591 a regular expression, or a function (described below).
592 For every line within the section that this regular
593 expression matches, the given rule will be applied to that
594 line. The exclusion rules denote which part(s) of the
595 line should not be modified; the alignment rules cause the
596 identified whitespace group to be contracted/expanded such
597 that the \"alignment character\" (the character
598 immediately following the identified parenthesis group),
599 occurs in the same column for every line within the
600 alignment section (see `align-region-separate' for a
601 description of how the region is broken up into alignment
604 The `regexp' attribute describes how the text should be
605 treated. Within this regexp, there must be at least one
606 group of characters (typically whitespace) identified by
607 the special opening and closing parens used in regexp
608 expressions (`\\\\(' and `\\\\)') (see the Emacs manual on
609 the syntax of regular expressions for more info).
611 If `regexp' is a function, it will be called as a
612 replacement for `re-search-forward'. This means that it
613 should return nil if nothing is found to match the rule,
614 or it should set the match data appropriately, move point
615 to the end of the match, and return the value of point.
617 `group' For exclusion rules, the group identifies the range of
618 characters that should be ignored. For alignment rules,
619 these are the characters that will be deleted/expanded for
620 the purposes of alignment. The \"alignment character\" is
621 always the first character immediately following this
622 parenthesis group. This attribute may also be a list of
623 integer, in which case multiple alignment characters will
624 be aligned, with the list of integer identifying the
625 whitespace groups which precede them. The default for
628 `modes' The `modes' attribute, if set, should name a list of
629 major modes -- or evaluate to such a value -- in which the
630 rule is valid. If not set, the rule will apply to all
633 `case-fold' If `regexp' is an ordinary regular expression string
634 containing alphabetic character, sometimes you may want
635 the search to proceed case-insensitively (for languages
636 that ignore case, such as pascal for example). In that
637 case, set `case-fold' to a non-nil value, and the regular
638 expression search will ignore case. If `regexp' is set to
639 a function, that function must handle the job of ignoring
642 `tab-stop' If the `tab-stop' attribute is set, and non-nil, the
643 alignment character will always fall on a tab stop
644 (whether it uses tabs to get there or not depends on the
645 value of `indent-tabs-mode'). If the `tab-stop' attribute
646 is set to nil, tab stops will never be used. Otherwise,
647 the value of `align-to-tab-stop' determines whether or not
648 to align to a tab stop. The `tab-stop' attribute may also
649 be a list of t or nil values, corresponding to the number
650 of parenthesis groups specified by the `group' attribute.
652 `repeat' If the `repeat' attribute is present, and non-nil, the
653 rule will be applied to the line continuously until no
654 further matches are found.
656 `valid' If the `valid' attribute is set, it will be used to
657 determine whether the rule should be invoked. This form
658 is evaluated after the regular expression match has been
659 performed, so that it is possible to use the results of
660 that match to determine whether the alignment should be
661 performed. The buffer should not be modified during the
662 evaluation of this form.
664 `run-if' Like `valid', the `run-if' attribute tests whether the
665 rule should be run at all -- even before any searches are
666 done to determine if the rule applies to the alignment
667 region. This can save time, since `run-if' will only be
668 run once for each rule. If it returns nil, the rule will
671 `column' For alignment rules, if the `column' attribute is set --
672 which must be an integer, or a symbol whose value is an
673 integer -- it will be used as the column in which to align
674 the alignment character. If the text on a particular line
675 happens to overrun that column, a single space character,
676 or tab stop (see `align-to-tab-stop') will be added
677 between the last text character and the alignment
680 `spacing' Alignment rules may also override the amount of spacing
681 that would normally be used by providing a `spacing'
682 attribute. This must be an integer, or a list of integers
683 corresponding to the number of parenthesis groups matched
684 by the `group' attribute. If a list of value is used, and
685 any of those values is nil, `align-default-spacing' will
686 be used for that subgroup. See `align-default-spacing'
687 for more details on spacing, tab stops, and how to
688 indicate how much spacing should be used. If TAB-STOP is
689 present, it will override the value of `align-to-tab-stop'
692 `justify' It is possible with `regexp' and `group' to identify a
693 character group that contains more than just whitespace
694 characters. By default, any non-whitespace characters in
695 that group will also be deleted while aligning the
696 alignment character. However, if the `justify' attribute
697 is set to a non-nil value, only the initial whitespace
698 characters within that group will be deleted. This has
699 the effect of right-justifying the characters that remain,
700 and can be used for outdenting or just plain old right-
703 `separate' Each rule can define its own section separator, which
704 describes how to identify the separation of \"sections\"
705 within the region to be aligned. Setting the `separate'
706 attribute overrides the value of `align-region-separate'
707 (see the documentation of that variable for possible
708 values), and any separation argument passed to `align'."
709 :type align-rules-list-type
712 (put 'align-rules-list 'risky-local-variable t)
714 (defvar align-exclude-rules-list-type
717 :tag "Exclusion rule"
718 (symbol :tag "Title")
719 (cons :tag "Required attributes"
721 (const :tag "(Regular expression to match)" regexp)
722 (choice :value "\\(\\s-+\\)" regexp function))
724 :tag "Optional attributes"
727 (const :tag "(Repeat this rule throughout line)"
730 (cons :tag "Paren group"
731 (const :tag "(Parenthesis group to use)" group)
733 integer (repeat integer)))
735 (const :tag "(Modes where this rule applies)" modes)
736 (sexp :value (text-mode)))
737 (cons :tag "Case-fold"
738 (const :tag "(Should case be ignored for this rule)"
740 (boolean :value t)))))))
741 "The `type' form for any `align-exclude-rules-list' variable.")
743 (defcustom align-exclude-rules-list
745 (regexp . "\"\\([^\"\n]+\\)\"")
747 (modes . align-dq-string-modes))
750 (regexp . "'\\([^'\n]+\\)'")
752 (modes . align-sq-string-modes))
757 (lambda (end reverse)
758 (funcall (if reverse 're-search-backward
760 (concat "[^ \t\n\\\\]"
761 (regexp-quote comment-start)
762 "\\(.+\\)$") end t))))
763 (modes . align-open-comment-modes))
766 (regexp . "/\\*\\(.+\\)\\*/")
768 (modes . align-c++-modes))
771 (regexp . "(\\([^)\n]+\\))")
773 (modes . align-c++-modes))
776 (regexp . "^\\s-*#\\s-*\\(if\\w*\\|endif\\)\\(.*\\)$")
778 (modes . align-c++-modes)))
779 "*A list describing text that should be excluded from alignment.
780 See the documentation for `align-rules-list' for more info."
781 :type align-exclude-rules-list-type
784 (put 'align-exclude-rules-list 'risky-local-variable t)
786 ;;; Internal Variables:
788 (defvar align-mode-rules-list nil
789 "Alignment rules specific to the current major mode.
790 See the variable `align-rules-list' for more details.")
792 (make-variable-buffer-local 'align-mode-rules-list)
794 (defvar align-mode-exclude-rules-list nil
795 "Alignment exclusion rules specific to the current major mode.
796 See the variable `align-exclude-rules-list' for more details.")
798 (make-variable-buffer-local 'align-mode-exclude-rules-list)
800 (defvar align-highlight-overlays nil
801 "The current overlays highlighting the text matched by a rule.")
803 ;; Sample extension rule set, for vhdl-mode. This should properly be
804 ;; in vhdl-mode.el itself.
806 (defcustom align-vhdl-rules-list
808 (regexp . "\\(signal\\|variable\\|constant\\)\\(\\s-+\\)\\S-")
812 (regexp . "\\(others\\|[^ \t\n=<]\\)\\(\\s-*\\)=>\\(\\s-*\\)\\S-")
817 (not (string= (downcase (match-string 1))
821 (regexp . "[^ \t\n:]\\(\\s-*\\):\\(\\s-*\\)[^=\n]")
825 (regexp . ":\\s-*\\(in\\|out\\|inout\\|buffer\\)\\(\\s-*\\)")
829 (regexp . "[^ \t\n=<]\\(\\s-*\\)<=\\(\\s-*\\)\\S-")
833 (regexp . "[^ \t\n:]\\(\\s-*\\):="))
836 (regexp . "\\(\\s-+\\)use\\s-+entity")))
837 "*Alignment rules for `vhdl-mode'. See `align-rules-list' for more info."
838 :type align-rules-list-type
841 (put 'align-vhdl-rules-list 'risky-local-variable t)
843 (defun align-set-vhdl-rules ()
844 "Setup the `align-mode-rules-list' variable for `vhdl-mode'."
845 (setq align-mode-rules-list align-vhdl-rules-list))
847 (add-hook 'vhdl-mode-hook 'align-set-vhdl-rules)
849 (add-to-list 'align-dq-string-modes 'vhdl-mode)
850 (add-to-list 'align-open-comment-modes 'vhdl-mode)
855 (defun align (beg end &optional separate rules exclude-rules)
856 "Attempt to align a region based on a set of alignment rules.
857 BEG and END mark the region. If BEG and END are specifically set to
858 nil (this can only be done programmatically), the beginning and end of
859 the current alignment section will be calculated based on the location
860 of point, and the value of `align-region-separate' (or possibly each
861 rule's `separate' attribute).
863 If SEPARATE is non-nil, it overrides the value of
864 `align-region-separate' for all rules, except those that have their
865 `separate' attribute set.
867 RULES and EXCLUDE-RULES, if either is non-nil, will replace the
868 default rule lists defined in `align-rules-list' and
869 `align-exclude-rules-list'. See `align-rules-list' for more details
870 on the format of these lists."
874 (if (and (symbolp align-region-separate)
875 (boundp align-region-separate))
876 (symbol-value align-region-separate)
877 align-region-separate)
879 (if (not (or ;(eq separator 'largest)
880 (and (functionp separator)
881 (not (funcall separator nil nil)))))
882 (align-region beg end separator
883 (or rules align-mode-rules-list align-rules-list)
884 (or exclude-rules align-mode-exclude-rules-list
885 align-exclude-rules-list))
886 (let ((sec-first end)
888 (align-region beg end
890 align-mode-exclude-rules-list
891 align-exclude-rules-list) nil
895 (when (and mode (listp mode))
896 (setq sec-first (min sec-first b)
897 sec-last (max sec-last e))))))
898 (if (< sec-first sec-last)
899 (align-region sec-first sec-last 'entire
900 (or rules align-mode-rules-list align-rules-list)
901 (or exclude-rules align-mode-exclude-rules-list
902 align-exclude-rules-list)))))))
905 (defun align-regexp (beg end regexp &optional group spacing repeat)
906 "Align the current region using an ad-hoc rule read from the minibuffer.
907 BEG and END mark the limits of the region. This function will prompt
908 for the REGEXP to align with. If no prefix arg was specified, you
909 only need to supply the characters to be lined up and any preceding
910 whitespace is replaced. If a prefix arg was specified, the full
911 regexp with parenthesized whitespace should be supplied; it will also
912 prompt for which parenthesis GROUP within REGEXP to modify, the amount
913 of SPACING to use, and whether or not to REPEAT the rule throughout
914 the line. See `align-rules-list' for more information about these
917 For example, let's say you had a list of phone numbers, and wanted to
918 align them so that the opening parentheses would line up:
922 Mary-Anne (123) 456-7890
925 There is no predefined rule to handle this, but you could easily do it
926 using a REGEXP like \"(\". All you would have to do is to mark the
927 region, call `align-regexp' and type in that regular expression."
930 (list (min (point) (mark))
931 (max (point) (mark)))
932 (if current-prefix-arg
933 (list (read-string "Complex align using regexp: "
937 "Parenthesis group to modify (justify if negative): " "1"))
939 (read-string "Amount of spacing (or column if negative): "
940 (number-to-string align-default-spacing)))
941 (y-or-n-p "Repeat throughout line? "))
942 (list (concat "\\(\\s-*\\)"
943 (read-string "Align regexp: "))
944 1 align-default-spacing nil))))
946 (list (list nil (cons 'regexp regexp)
947 (cons 'group (abs group))
952 (cons 'spacing spacing)
953 (cons 'column (abs spacing)))
954 (cons 'repeat repeat)))))
955 (align-region beg end 'entire rule nil nil)))
958 (defun align-entire (beg end &optional rules exclude-rules)
959 "Align the selected region as if it were one alignment section.
960 BEG and END mark the extent of the region. If RULES or EXCLUDE-RULES
961 is set to a list of rules (see `align-rules-list'), it can be used to
962 override the default alignment rules that would have been used to
965 (align beg end 'entire rules exclude-rules))
968 (defun align-current (&optional rules exclude-rules)
969 "Call `align' on the current alignment section.
970 This function assumes you want to align only the current section, and
971 so saves you from having to specify the region. If RULES or
972 EXCLUDE-RULES is set to a list of rules (see `align-rules-list'), it
973 can be used to override the default alignment rules that would have
974 been used to align that section."
976 (align nil nil nil rules exclude-rules))
979 (defun align-highlight-rule (beg end title &optional rules exclude-rules)
980 "Highlight the whitespace which a given rule would have modified.
981 BEG and END mark the extent of the region. TITLE identifies the rule
982 that should be highlighted. If RULES or EXCLUDE-RULES is set to a
983 list of rules (see `align-rules-list'), it can be used to override the
984 default alignment rules that would have been used to identify the text
987 (list (min (mark) (point))
990 "Title of rule to highlight: "
994 (list (symbol-name (car rule)))))
995 (append (or align-mode-rules-list align-rules-list)
996 (or align-mode-exclude-rules-list
997 align-exclude-rules-list))) nil t)))
998 (let ((ex-rule (assq (intern title)
999 (or align-mode-exclude-rules-list
1000 align-exclude-rules-list)))
1002 (align-unhighlight-rule)
1005 (or rules (if ex-rule
1006 (or exclude-rules align-mode-exclude-rules-list
1007 align-exclude-rules-list)
1008 (or align-mode-rules-list align-rules-list)))
1009 (unless ex-rule (or exclude-rules align-mode-exclude-rules-list
1010 align-exclude-rules-list))
1013 (if (and mode (listp mode))
1014 (if (equal (symbol-name (car mode)) title)
1015 (setq face (cons align-highlight-change-face
1016 align-highlight-nochange-face))
1019 (let ((overlay (make-overlay b e)))
1020 (setq align-highlight-overlays
1021 (cons overlay align-highlight-overlays))
1022 (overlay-put overlay 'face
1025 (cdr face)))))))))))
1028 (defun align-unhighlight-rule ()
1029 "Remove any highlighting that was added by `align-highlight-rule'."
1031 (while align-highlight-overlays
1032 (delete-overlay (car align-highlight-overlays))
1033 (setq align-highlight-overlays
1034 (cdr align-highlight-overlays))))
1037 (defun align-newline-and-indent ()
1038 "A replacement function for `newline-and-indent', aligning as it goes."
1040 (let ((separate (or (if (and (symbolp align-region-separate)
1041 (boundp align-region-separate))
1042 (symbol-value align-region-separate)
1043 align-region-separate)
1046 (call-interactively 'newline-and-indent)
1049 (while (not (or (bobp)
1050 (align-new-section-p (point) end separate)))
1052 (align (point) end))))
1054 ;;; Internal Functions:
1056 (defun align-match-tex-pattern (regexp end &optional reverse)
1057 "Match REGEXP in TeX mode, counting backslashes appropriately.
1058 END denotes the end of the region to be searched, while REVERSE, if
1059 non-nil, indicates that the search should proceed backward from the
1065 (if reverse 're-search-backward
1067 (concat "\\(\\s-*\\)" regexp
1068 "\\(\\s-*\\)") end t))
1069 (let ((pos (match-end 1))
1071 (while (and (> pos (point-min))
1072 (eq (char-before pos) ?\\))
1073 (setq count (1+ count) pos (1- pos)))
1074 (eq (mod count 2) 1))
1075 (goto-char (match-beginning 2))))
1078 (defun align-new-section-p (beg end separator)
1079 "Is there a section divider between BEG and END?
1080 SEPARATOR specifies how to look for the section divider. See the
1081 documentation for `align-region-separate' for more details."
1082 (cond ((or (not separator)
1083 (eq separator 'entire))
1085 ((eq separator 'group)
1091 (> (count-lines beg end) amount)))
1092 ((stringp separator)
1095 (re-search-forward separator end t)))
1096 ((functionp separator)
1097 (funcall separator beg end))
1099 (let ((seps separator) yes)
1101 (if (and (>= (car seps) beg)
1102 (<= (car seps) end))
1103 (setq yes t seps nil)
1104 (setq seps (cdr seps))))
1107 (defun align-adjust-col-for-rule (column rule spacing tab-stop)
1108 "Adjust COLUMN according to the given RULE.
1109 SPACING specifies how much spacing to use.
1110 TAB-STOP specifies whether SPACING refers to tab-stop boundaries."
1112 (setq spacing align-default-spacing))
1117 (let ((stops tab-stop-list))
1119 (if (and (> (car stops) column)
1120 (= (setq spacing (1- spacing)) 0))
1121 (setq column (car stops)
1123 (setq stops (cdr stops)))))
1126 (defsubst align-column (pos)
1127 "Given a position in the buffer, state what column it's in.
1128 POS is the position whose column will be taken. Note that this
1129 function will change the location of point."
1133 (defsubst align-regions (regions props rule func)
1134 "Align the regions specified in REGIONS, a list of cons cells.
1135 PROPS describes formatting features specific to the given regions.
1136 RULE specifies exactly how to perform the alignments.
1137 If FUNC is specified, it will be called with each region that would
1138 have been aligned, rather than modifying the text."
1141 (align-areas (car regions) (car props) rule func))
1142 (setq regions (cdr regions)
1143 props (cdr props))))
1145 (defun align-areas (areas props rule func)
1146 "Given a list of AREAS and formatting PROPS, align according to RULE.
1147 AREAS should be a list of cons cells containing beginning and ending
1148 markers. This function sweeps through all of the beginning markers,
1149 finds out which one starts in the furthermost column, and then deletes
1150 and inserts text such that all of the ending markers occur in the same
1153 If FUNC is non-nil, it will be called for each text region that would
1154 have been aligned. No changes will be made to the buffer."
1155 (let* ((column (cdr (assq 'column rule)))
1156 (fixed (if (symbolp column)
1157 (symbol-value column)
1159 (justify (cdr (assq 'justify rule)))
1164 ;; Determine the alignment column.
1168 (setq col (max col (align-column (caar a)))))
1170 (goto-char (cdar a))
1172 (if (/= ecol (current-column))
1174 (setq ecol (current-column))))
1176 (goto-char (caar a))
1177 (if (and (re-search-forward "\\s-*" (cdar a) t)
1178 (/= (point) (cdar a)))
1179 (let ((bcol (current-column)))
1180 (setcdr (car a) (cons (point-marker) (cdar a)))
1181 (goto-char (cdr (cdar a)))
1182 (setq width (max width (- (current-column) bcol))))))
1186 (setq col (+ (align-adjust-col-for-rule
1187 col rule (car props) (cdr props)) width)))
1189 ;; Make all ending positions to occur in the goal column. Since
1190 ;; the whitespace to be modified was already deleted by
1191 ;; `align-region', all we have to do here is indent.
1194 (setq change (and ecol (/= col ecol))))
1196 (when (or func change)
1198 (let ((area (car areas))
1202 (funcall func (car area) (cdr area) change)
1203 (if (not (and justify
1204 (consp (cdr area))))
1205 (goto-char (cdr area))
1206 (goto-char (cddr area))
1207 (let ((ecol (current-column)))
1208 (goto-char (cadr area))
1209 (setq gocol (- col (- ecol (current-column))))))
1210 (setq cur (current-column))
1211 (cond ((< gocol 0) t) ; don't do anything
1212 ((= cur gocol) t) ; don't need to
1213 ((< cur gocol) ; just add space
1216 ;; This code works around an oddity in the
1217 ;; FORCE argument of `move-to-column', which
1218 ;; tends to screw up markers if there is any
1220 (let ((endcol (align-column
1226 (align-column (car area)))))
1228 (goto-char (car area))
1229 (move-to-column gocol t))
1230 (let ((here (point)))
1231 (move-to-column endcol t)
1232 (delete-region here (point))
1234 (indent-to (align-adjust-col-for-rule
1235 (current-column) rule
1236 (car props) (cdr props)))))))))))
1237 (setq areas (cdr areas))))))
1239 (defun align-region (beg end separate rules exclude-rules
1241 "Align a region based on a given set of alignment rules.
1242 BEG and END specify the region to be aligned. Either may be nil, in
1243 which case the range will stop at the nearest section division (see
1244 `align-region-separate', and `align-region-heuristic' for more
1247 The region will be divided into separate alignment sections based on
1248 the value of SEPARATE.
1250 RULES and EXCLUDE-RULES are a pair of lists describing how to align
1251 the region, and which text areas within it should be excluded from
1252 alignment. See the `align-rules-list' for more information on the
1253 required format of these two lists.
1255 If FUNC is specified, no text will be modified. What `align-region'
1256 will do with the rules is to search for the alignment areas, as it
1257 regularly would, taking account for exclusions, and then call FUNC,
1258 first with the beginning and ending of the region to be aligned
1259 according to that rule (this can be different for each rule, if BEG
1260 and END were nil), and then with the beginning and ending of each
1261 text region that the rule would have applied to.
1263 The signature of FUNC should thus be:
1265 (defun my-align-function (beg end mode)
1266 \"If MODE is a rule (a list), return t if BEG to END are to be searched.
1267 Otherwise BEG to END will be a region of text that matches the rule's
1268 definition, and MODE will be non-nil if any changes are necessary.\"
1269 (unless (and mode (listp mode))
1270 (message \"Would have aligned from %d to %d...\" beg end)))
1272 This feature (of passing a FUNC) is used internally to locate the
1273 position of exclusion areas, but could also be used for any other
1274 purpose where you might want to know where the regions that the
1275 aligner would have dealt with are."
1276 (let ((end-mark (and end (copy-marker end t)))
1279 (report (and (not func) align-large-region beg end
1280 (>= (- end beg) align-large-region)))
1282 (rule-count (length rules)))
1283 (if (and align-indent-before-aligning real-beg end-mark)
1284 (indent-region real-beg end-mark nil))
1286 (let* ((rule (car rules))
1287 (run-if (assq 'run-if rule))
1288 (modes (assq 'modes rule)))
1289 ;; unless the `run-if' form tells us not to, look for the
1291 (unless (or (and modes (not (memq major-mode
1292 (eval (cdr modes)))))
1293 (and run-if (not (funcall (cdr run-if)))))
1294 (let* ((current-case-fold case-fold-search)
1295 (case-fold (assq 'case-fold rule))
1296 (regexp (cdr (assq 'regexp rule)))
1297 (regfunc (and (functionp regexp) regexp))
1298 (rulesep (assq 'separate rule))
1299 (thissep (if rulesep (cdr rulesep) separate))
1313 ;; if beg and end were not given, figure out what the
1314 ;; current alignment region should be. Depending on the
1315 ;; value of `align-region-separate' it's possible for
1316 ;; each rule to have its own definition of what that
1317 ;; current alignment section is.
1320 (if (or (not thissep) (eq thissep 'entire))
1321 (error "Cannot determine alignment region for '%s'"
1322 (symbol-name (cdr (assq 'title rule)))))
1324 (while (and (not (eobp))
1325 (looking-at "^\\s-*$"))
1327 (let* ((here (point))
1331 (and align-region-heuristic
1333 align-region-heuristic))))
1335 (funcall regfunc terminus t)
1336 (re-search-backward regexp
1338 (if (align-new-section-p (point) here thissep)
1341 (setq here (point))))
1350 (and align-region-heuristic
1352 align-region-heuristic))))
1354 (funcall regfunc terminus nil)
1355 (re-search-forward regexp terminus t))))
1356 (if (align-new-section-p here (point) thissep)
1359 (setq here (point))))
1364 end-mark (copy-marker end t))
1367 ;; If we have a region to align, and `func' is set and
1368 ;; reports back that the region is ok, then align it.
1369 (when (or (not func)
1370 (funcall func beg end rule))
1372 (let (exclude-areas)
1373 ;; determine first of all where the exclusions
1374 ;; lie in this region
1376 ;; guard against a problem with recursion and
1377 ;; dynamic binding vs. lexical binding, since
1378 ;; the call to `align-region' below will
1379 ;; re-enter this function, and rebind
1381 (set (setq exclude-areas
1382 (make-symbol "align-exclude-areas"))
1388 (or (and mode (listp mode))
1389 (set (quote ,exclude-areas)
1393 (sort (symbol-value exclude-areas)
1396 (>= (car l) (car r)))))))
1398 ;; set `case-fold-search' according to the
1399 ;; (optional) `case-fold' property
1401 (setq case-fold-search (cdr case-fold)))
1403 ;; while we can find the rule in the alignment
1405 (while (and (< (point) end-mark)
1407 (funcall regfunc end-mark nil)
1408 (re-search-forward regexp
1411 ;; give the user some indication of where we
1412 ;; are, if it's a very large region being
1415 (let ((symbol (car rule)))
1416 (if (and symbol (symbolp symbol))
1418 "Aligning `%s' (rule %d of %d) %d%%..."
1419 (symbol-name symbol) rule-index rule-count
1420 (/ (* (- (point) real-beg) 100)
1421 (- end-mark real-beg)))
1424 (/ (* (- (point) real-beg) 100)
1425 (- end-mark real-beg))))))
1427 ;; if the search ended us on the beginning of
1428 ;; the next line, move back to the end of the
1433 ;; lookup the `group' attribute the first time
1436 (setq group (or (cdr (assq 'group rule)) 1))
1438 (setq first (car group))
1439 (setq first group group (list group)))
1443 (setq spacing (cdr (assq 'spacing rule))
1448 (let ((rule-ts (assq 'tab-stop rule)))
1451 (if (symbolp align-to-tab-stop)
1452 (symbol-value align-to-tab-stop)
1453 align-to-tab-stop)))
1456 ;; test whether we have found a match on the same
1457 ;; line as a previous match
1464 ;; lookup the `repeat' attribute the first time
1466 (setq repeat (cdr (assq 'repeat rule))
1469 ;; lookup the `valid' attribute the first time
1471 (setq valid (assq 'valid rule)
1474 ;; remember the beginning position of this rule
1475 ;; match, and save the match-data, since either
1476 ;; the `valid' form, or the code that searches for
1477 ;; section separation, might alter it
1478 (setq b (match-beginning first)
1479 save-match-data (match-data))
1481 ;; unless the `valid' attribute is set, and tells
1482 ;; us that the rule is not valid at this point in
1484 (unless (and valid (not (funcall (cdr valid))))
1486 ;; look to see if this match begins a new
1487 ;; section. If so, we should align what we've
1488 ;; collected so far, and then begin collecting
1489 ;; anew for the next alignment section
1491 (align-new-section-p last-point b
1494 (align-regions regions align-props
1496 (setq last-point (copy-marker b t)
1499 (setq last-point (copy-marker b t)))
1501 ;; restore the match data
1502 (set-match-data save-match-data)
1504 ;; check whether the region to be aligned
1505 ;; straddles an exclusion area
1506 (let ((excls exclude-areas))
1507 (setq exclude-p nil)
1509 (if (and (< (match-beginning (car group))
1511 (> (match-end (car (last group)))
1515 (setq excls (cdr excls)))))
1517 ;; go through the list of parenthesis groups
1518 ;; matching whitespace text to be
1519 ;; contracted/expanded (or possibly
1520 ;; justified, if the `justify' attribute was
1526 ;; we have to use markers, since
1527 ;; `align-areas' may modify the buffer
1528 (setq b (copy-marker
1529 (match-beginning (car g)) t)
1530 e (copy-marker (match-end (car g)) t))
1532 ;; record this text region for alignment
1533 (setq index (if same (1+ index) 0))
1534 (let ((region (cons b e))
1539 (if (listp tab-stop)
1542 (if (nth index regions)
1543 (setcar (nthcdr index regions)
1545 (nth index regions)))
1549 (list (list region)))
1550 (nconc align-props (list props)))
1552 (list (list region)))
1553 (setq align-props (list props)))))
1555 ;; if any further rule matches are
1556 ;; found before `eol', then they are
1557 ;; on the same line as this one; this
1558 ;; can only happen if the `repeat'
1559 ;; attribute is non-nil
1561 (setq spacing (cdr spacing)))
1562 (if (listp tab-stop)
1563 (setq tab-stop (cdr tab-stop)))
1564 (setq same t g (cdr g))))
1566 ;; if `repeat' has not been set, move to
1567 ;; the next line; don't bother searching
1568 ;; anymore on this one
1569 (if (and (not repeat) (not (bolp)))
1572 ;; when they are no more matches for this rule,
1573 ;; align whatever was left over
1575 (align-regions regions align-props rule func)))
1577 (setq case-fold-search current-case-fold)))))))
1578 (setq rules (cdr rules)
1579 rule-index (1+ rule-index)))
1582 (message "Aligning...done"))))
1588 (run-hooks 'align-load-hook)
1590 ;;; arch-tag: ef79cccf-1db8-4888-a8a1-d7ce2d1532f7
1591 ;;; align.el ends here