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4821e2af ER |
1 | ;;; perl-mode.el --- Perl code editing commands for GNU Emacs |
2 | ||
4da31937 | 3 | ;; Copyright (C) 1990 Free Software Foundation, Inc. |
3a801d0c | 4 | |
4821e2af | 5 | ;; Author: William F. Mann |
4821e2af | 6 | ;; Adapted-By: ESR |
d7b4d18f | 7 | ;; Keywords: languages |
4821e2af | 8 | |
2076c87c JB |
9 | ;; Adapted from C code editing commands 'c-mode.el', Copyright 1987 by the |
10 | ;; Free Software Foundation, under terms of its General Public License. | |
11 | ||
4da31937 RS |
12 | ;; This file is part of GNU Emacs. |
13 | ||
14 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
15 | ;; it under the terms of the GNU General Public License as published by | |
16 | ;; the Free Software Foundation; either version 2, or (at your option) | |
17 | ;; any later version. | |
18 | ||
19 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
20 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | ;; GNU General Public License for more details. | |
23 | ||
24 | ;; You should have received a copy of the GNU General Public License | |
25 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
26 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
2076c87c | 27 | |
4821e2af ER |
28 | ;;; Commentary: |
29 | ||
2076c87c JB |
30 | ;; To enter perl-mode automatically, add (autoload 'perl-mode "perl-mode") |
31 | ;; to your .emacs file and change the first line of your perl script to: | |
32 | ;; #!/usr/bin/perl -- # -*-Perl-*- | |
33 | ;; With argments to perl: | |
34 | ;; #!/usr/bin/perl -P- # -*-Perl-*- | |
35 | ;; To handle files included with do 'filename.pl';, add something like | |
36 | ;; (setq auto-mode-alist (append (list (cons "\\.pl$" 'perl-mode)) | |
37 | ;; auto-mode-alist)) | |
38 | ;; to your .emacs file; otherwise the .pl suffix defaults to prolog-mode. | |
39 | ||
40 | ;; This code is based on the 18.53 version c-mode.el, with extensive | |
41 | ;; rewriting. Most of the features of c-mode survived intact. | |
42 | ||
43 | ;; I added a new feature which adds functionality to TAB; it is controlled | |
44 | ;; by the variable perl-tab-to-comment. With it enabled, TAB does the | |
45 | ;; first thing it can from the following list: change the indentation; | |
46 | ;; move past leading white space; delete an empty comment; reindent a | |
47 | ;; comment; move to end of line; create an empty comment; tell you that | |
48 | ;; the line ends in a quoted string, or has a # which should be a \#. | |
49 | ||
50 | ;; If your machine is slow, you may want to remove some of the bindings | |
51 | ;; to electric-perl-terminator. I changed the indenting defaults to be | |
52 | ;; what Larry Wall uses in perl/lib, but left in all the options. | |
53 | ||
54 | ;; I also tuned a few things: comments and labels starting in column | |
55 | ;; zero are left there by indent-perl-exp; perl-beginning-of-function | |
56 | ;; goes back to the first open brace/paren in column zero, the open brace | |
57 | ;; in 'sub ... {', or the equal sign in 'format ... ='; indent-perl-exp | |
58 | ;; (meta-^q) indents from the current line through the close of the next | |
59 | ;; brace/paren, so you don't need to start exactly at a brace or paren. | |
60 | ||
61 | ;; It may be good style to put a set of redundant braces around your | |
62 | ;; main program. This will let you reindent it with meta-^q. | |
63 | ||
282d89c0 | 64 | ;; Known problems (these are all caused by limitations in the Emacs Lisp |
2076c87c JB |
65 | ;; parsing routine (parse-partial-sexp), which was not designed for such |
66 | ;; a rich language; writing a more suitable parser would be a big job): | |
eb8c3be9 | 67 | ;; 1) Regular expression delimiters do not act as quotes, so special |
2076c87c JB |
68 | ;; characters such as `'"#:;[](){} may need to be backslashed |
69 | ;; in regular expressions and in both parts of s/// and tr///. | |
70 | ;; 2) The globbing syntax <pattern> is not recognized, so special | |
71 | ;; characters in the pattern string must be backslashed. | |
72 | ;; 3) The q, qq, and << quoting operators are not recognized; see below. | |
73 | ;; 4) \ (backslash) always quotes the next character, so '\' is | |
74 | ;; treated as the start of a string. Use "\\" as a work-around. | |
75 | ;; 5) To make variables such a $' and $#array work, perl-mode treats | |
76 | ;; $ just like backslash, so '$' is the same as problem 5. | |
77 | ;; 6) Unfortunately, treating $ like \ makes ${var} be treated as an | |
78 | ;; unmatched }. See below. | |
79 | ;; 7) When ' (quote) is used as a package name separator, perl-mode | |
80 | ;; doesn't understand, and thinks it is seeing a quoted string. | |
81 | ||
82 | ;; Here are some ugly tricks to bypass some of these problems: the perl | |
83 | ;; expression /`/ (that's a back-tick) usually evaluates harmlessly, | |
84 | ;; but will trick perl-mode into starting a quoted string, which | |
85 | ;; can be ended with another /`/. Assuming you have no embedded | |
86 | ;; back-ticks, this can used to help solve problem 3: | |
87 | ;; | |
88 | ;; /`/; $ugly = q?"'$?; /`/; | |
89 | ;; | |
90 | ;; To solve problem 6, add a /{/; before each use of ${var}: | |
91 | ;; /{/; while (<${glob_me}>) ... | |
92 | ;; | |
93 | ;; Problem 7 is even worse, but this 'fix' does work :-( | |
94 | ;; $DB'stop#' | |
95 | ;; [$DB'line#' | |
96 | ;; ] =~ s/;9$//; | |
97 | ||
4821e2af | 98 | ;;; Code: |
2076c87c JB |
99 | |
100 | (defvar perl-mode-abbrev-table nil | |
101 | "Abbrev table in use in perl-mode buffers.") | |
102 | (define-abbrev-table 'perl-mode-abbrev-table ()) | |
103 | ||
104 | (defvar perl-mode-map () | |
105 | "Keymap used in Perl mode.") | |
106 | (if perl-mode-map | |
107 | () | |
108 | (setq perl-mode-map (make-sparse-keymap)) | |
109 | (define-key perl-mode-map "{" 'electric-perl-terminator) | |
110 | (define-key perl-mode-map "}" 'electric-perl-terminator) | |
111 | (define-key perl-mode-map ";" 'electric-perl-terminator) | |
112 | (define-key perl-mode-map ":" 'electric-perl-terminator) | |
113 | (define-key perl-mode-map "\e\C-a" 'perl-beginning-of-function) | |
114 | (define-key perl-mode-map "\e\C-e" 'perl-end-of-function) | |
115 | (define-key perl-mode-map "\e\C-h" 'mark-perl-function) | |
116 | (define-key perl-mode-map "\e\C-q" 'indent-perl-exp) | |
117 | (define-key perl-mode-map "\177" 'backward-delete-char-untabify) | |
118 | (define-key perl-mode-map "\t" 'perl-indent-command)) | |
119 | ||
120 | (autoload 'c-macro-expand "cmacexp" | |
121 | "Display the result of expanding all C macros occurring in the region. | |
122 | The expansion is entirely correct because it uses the C preprocessor." | |
123 | t) | |
124 | ||
125 | (defvar perl-mode-syntax-table nil | |
126 | "Syntax table in use in perl-mode buffers.") | |
127 | ||
128 | (if perl-mode-syntax-table | |
129 | () | |
130 | (setq perl-mode-syntax-table (make-syntax-table (standard-syntax-table))) | |
131 | (modify-syntax-entry ?\n ">" perl-mode-syntax-table) | |
132 | (modify-syntax-entry ?# "<" perl-mode-syntax-table) | |
133 | (modify-syntax-entry ?$ "/" perl-mode-syntax-table) | |
134 | (modify-syntax-entry ?% "." perl-mode-syntax-table) | |
135 | (modify-syntax-entry ?& "." perl-mode-syntax-table) | |
136 | (modify-syntax-entry ?\' "\"" perl-mode-syntax-table) | |
137 | (modify-syntax-entry ?* "." perl-mode-syntax-table) | |
138 | (modify-syntax-entry ?+ "." perl-mode-syntax-table) | |
139 | (modify-syntax-entry ?- "." perl-mode-syntax-table) | |
140 | (modify-syntax-entry ?/ "." perl-mode-syntax-table) | |
141 | (modify-syntax-entry ?< "." perl-mode-syntax-table) | |
142 | (modify-syntax-entry ?= "." perl-mode-syntax-table) | |
143 | (modify-syntax-entry ?> "." perl-mode-syntax-table) | |
144 | (modify-syntax-entry ?\\ "\\" perl-mode-syntax-table) | |
145 | (modify-syntax-entry ?` "\"" perl-mode-syntax-table) | |
146 | (modify-syntax-entry ?| "." perl-mode-syntax-table) | |
147 | ) | |
148 | ||
149 | (defconst perl-indent-level 4 | |
150 | "*Indentation of Perl statements with respect to containing block.") | |
151 | (defconst perl-continued-statement-offset 4 | |
152 | "*Extra indent for lines not starting new statements.") | |
153 | (defconst perl-continued-brace-offset -4 | |
154 | "*Extra indent for substatements that start with open-braces. | |
155 | This is in addition to perl-continued-statement-offset.") | |
156 | (defconst perl-brace-offset 0 | |
157 | "*Extra indentation for braces, compared with other text in same context.") | |
158 | (defconst perl-brace-imaginary-offset 0 | |
159 | "*Imagined indentation of an open brace that actually follows a statement.") | |
160 | (defconst perl-label-offset -2 | |
161 | "*Offset of Perl label lines relative to usual indentation.") | |
162 | ||
163 | (defconst perl-tab-always-indent t | |
164 | "*Non-nil means TAB in Perl mode should always indent the current line, | |
165 | regardless of where in the line point is when the TAB command is used.") | |
166 | ||
167 | (defconst perl-tab-to-comment t | |
168 | "*Non-nil means that for lines which don't need indenting, TAB will | |
169 | either indent an existing comment, move to end-of-line, or if at end-of-line | |
170 | already, create a new comment.") | |
171 | ||
172 | (defconst perl-nochange ";?#\\|\f\\|\\s(\\|\\(\\w\\|\\s_\\)+:" | |
173 | "*Lines starting with this regular expression will not be auto-indented.") | |
174 | \f | |
175 | (defun perl-mode () | |
176 | "Major mode for editing Perl code. | |
177 | Expression and list commands understand all Perl brackets. | |
178 | Tab indents for Perl code. | |
179 | Comments are delimited with # ... \\n. | |
180 | Paragraphs are separated by blank lines only. | |
181 | Delete converts tabs to spaces as it moves back. | |
182 | \\{perl-mode-map} | |
183 | Variables controlling indentation style: | |
184 | perl-tab-always-indent | |
185 | Non-nil means TAB in Perl mode should always indent the current line, | |
186 | regardless of where in the line point is when the TAB command is used. | |
187 | perl-tab-to-comment | |
188 | Non-nil means that for lines which don't need indenting, TAB will | |
189 | either delete an empty comment, indent an existing comment, move | |
190 | to end-of-line, or if at end-of-line already, create a new comment. | |
191 | perl-nochange | |
192 | Lines starting with this regular expression will not be auto-indented. | |
193 | perl-indent-level | |
194 | Indentation of Perl statements within surrounding block. | |
195 | The surrounding block's indentation is the indentation | |
196 | of the line on which the open-brace appears. | |
197 | perl-continued-statement-offset | |
198 | Extra indentation given to a substatement, such as the | |
199 | then-clause of an if or body of a while. | |
200 | perl-continued-brace-offset | |
201 | Extra indentation given to a brace that starts a substatement. | |
202 | This is in addition to perl-continued-statement-offset. | |
203 | perl-brace-offset | |
204 | Extra indentation for line if it starts with an open brace. | |
205 | perl-brace-imaginary-offset | |
206 | An open brace following other text is treated as if it were | |
207 | this far to the right of the start of its line. | |
208 | perl-label-offset | |
209 | Extra indentation for line that is a label. | |
210 | ||
211 | Various indentation styles: K&R BSD BLK GNU LW | |
212 | perl-indent-level 5 8 0 2 4 | |
213 | perl-continued-statement-offset 5 8 4 2 4 | |
214 | perl-continued-brace-offset 0 0 0 0 -4 | |
215 | perl-brace-offset -5 -8 0 0 0 | |
216 | perl-brace-imaginary-offset 0 0 4 0 0 | |
217 | perl-label-offset -5 -8 -2 -2 -2 | |
218 | ||
219 | Turning on Perl mode calls the value of the variable perl-mode-hook with no | |
220 | args, if that value is non-nil." | |
221 | (interactive) | |
222 | (kill-all-local-variables) | |
223 | (use-local-map perl-mode-map) | |
224 | (setq major-mode 'perl-mode) | |
225 | (setq mode-name "Perl") | |
226 | (setq local-abbrev-table perl-mode-abbrev-table) | |
227 | (set-syntax-table perl-mode-syntax-table) | |
228 | (make-local-variable 'paragraph-start) | |
229 | (setq paragraph-start (concat "^$\\|" page-delimiter)) | |
230 | (make-local-variable 'paragraph-separate) | |
231 | (setq paragraph-separate paragraph-start) | |
232 | (make-local-variable 'paragraph-ignore-fill-prefix) | |
233 | (setq paragraph-ignore-fill-prefix t) | |
234 | (make-local-variable 'indent-line-function) | |
235 | (setq indent-line-function 'perl-indent-line) | |
236 | (make-local-variable 'require-final-newline) | |
237 | (setq require-final-newline t) | |
238 | (make-local-variable 'comment-start) | |
239 | (setq comment-start "# ") | |
240 | (make-local-variable 'comment-end) | |
241 | (setq comment-end "") | |
242 | (make-local-variable 'comment-column) | |
243 | (setq comment-column 32) | |
244 | (make-local-variable 'comment-start-skip) | |
245 | (setq comment-start-skip "\\(^\\|\\s-\\);?#+ *") | |
e41b2db1 ER |
246 | (make-local-variable 'comment-indent-function) |
247 | (setq comment-indent-function 'perl-comment-indent) | |
2076c87c JB |
248 | (make-local-variable 'parse-sexp-ignore-comments) |
249 | (setq parse-sexp-ignore-comments nil) | |
250 | (run-hooks 'perl-mode-hook)) | |
251 | \f | |
252 | ;; This is used by indent-for-comment | |
253 | ;; to decide how much to indent a comment in Perl code | |
254 | ;; based on its context. | |
255 | (defun perl-comment-indent () | |
256 | (if (and (bolp) (not (eolp))) | |
257 | 0 ;Existing comment at bol stays there. | |
258 | (save-excursion | |
259 | (skip-chars-backward " \t") | |
260 | (max (1+ (current-column)) ;Else indent at comment column | |
261 | comment-column)))) ; except leave at least one space. | |
262 | ||
263 | (defun electric-perl-terminator (arg) | |
264 | "Insert character. If at end-of-line, and not in a comment or a quote, | |
265 | correct the line's indentation." | |
266 | (interactive "P") | |
267 | (let ((insertpos (point))) | |
268 | (and (not arg) ; decide whether to indent | |
269 | (eolp) | |
270 | (save-excursion | |
271 | (beginning-of-line) | |
272 | (and (not ; eliminate comments quickly | |
273 | (re-search-forward comment-start-skip insertpos t)) | |
274 | (or (/= last-command-char ?:) | |
275 | ;; Colon is special only after a label .... | |
276 | (looking-at "\\s-*\\(\\w\\|\\s_\\)+$")) | |
277 | (let ((pps (parse-partial-sexp | |
278 | (perl-beginning-of-function) insertpos))) | |
279 | (not (or (nth 3 pps) (nth 4 pps) (nth 5 pps)))))) | |
280 | (progn ; must insert, indent, delete | |
281 | (insert-char last-command-char 1) | |
282 | (perl-indent-line) | |
283 | (delete-char -1)))) | |
284 | (self-insert-command (prefix-numeric-value arg))) | |
285 | ||
286 | ;; not used anymore, but may be useful someday: | |
287 | ;;(defun perl-inside-parens-p () | |
288 | ;; (condition-case () | |
289 | ;; (save-excursion | |
290 | ;; (save-restriction | |
291 | ;; (narrow-to-region (point) | |
292 | ;; (perl-beginning-of-function)) | |
293 | ;; (goto-char (point-max)) | |
294 | ;; (= (char-after (or (scan-lists (point) -1 1) (point-min))) ?\())) | |
295 | ;; (error nil))) | |
296 | \f | |
297 | (defun perl-indent-command (&optional arg) | |
298 | "Indent current line as Perl code, or optionally, insert a tab character. | |
299 | ||
300 | With an argument, indent the current line, regardless of other options. | |
301 | ||
302 | If perl-tab-always-indent is nil and point is not in the indentation | |
303 | area at the beginning of the line, simply insert a tab. | |
304 | ||
305 | Otherwise, indent the current line. If point was within the indentation | |
306 | area it is moved to the end of the indentation area. If the line was | |
307 | already indented properly and point was not within the indentation area, | |
308 | and if perl-tab-to-comment is non-nil (the default), then do the first | |
309 | possible action from the following list: | |
310 | ||
311 | 1) delete an empty comment | |
312 | 2) move forward to start of comment, indenting if necessary | |
313 | 3) move forward to end of line | |
314 | 4) create an empty comment | |
315 | 5) move backward to start of comment, indenting if necessary." | |
316 | (interactive "P") | |
317 | (if arg ; If arg, just indent this line | |
318 | (perl-indent-line "\f") | |
319 | (if (and (not perl-tab-always-indent) | |
320 | (<= (current-column) (current-indentation))) | |
321 | (insert-tab) | |
322 | (let (bof lsexp delta (oldpnt (point))) | |
323 | (beginning-of-line) | |
324 | (setq lsexp (point)) | |
325 | (setq bof (perl-beginning-of-function)) | |
326 | (goto-char oldpnt) | |
327 | (setq delta (perl-indent-line "\f\\|;?#" bof)) | |
328 | (and perl-tab-to-comment | |
329 | (= oldpnt (point)) ; done if point moved | |
330 | (if (listp delta) ; if line starts in a quoted string | |
331 | (setq lsexp (or (nth 2 delta) bof)) | |
332 | (= delta 0)) ; done if indenting occurred | |
333 | (let (eol state) | |
334 | (end-of-line) | |
335 | (setq eol (point)) | |
336 | (if (= (char-after bof) ?=) | |
337 | (if (= oldpnt eol) | |
338 | (message "In a format statement")) | |
339 | (setq state (parse-partial-sexp lsexp eol)) | |
340 | (if (nth 3 state) | |
341 | (if (= oldpnt eol) ; already at eol in a string | |
342 | (message "In a string which starts with a %c." | |
343 | (nth 3 state))) | |
344 | (if (not (nth 4 state)) | |
345 | (if (= oldpnt eol) ; no comment, create one? | |
346 | (indent-for-comment)) | |
347 | (beginning-of-line) | |
348 | (if (re-search-forward comment-start-skip eol 'move) | |
349 | (if (eolp) | |
350 | (progn ; kill existing comment | |
351 | (goto-char (match-beginning 0)) | |
352 | (skip-chars-backward " \t") | |
353 | (kill-region (point) eol)) | |
354 | (if (or (< oldpnt (point)) (= oldpnt eol)) | |
355 | (indent-for-comment) ; indent existing comment | |
356 | (end-of-line))) | |
357 | (if (/= oldpnt eol) | |
358 | (end-of-line) | |
359 | (message "Use backslash to quote # characters.") | |
360 | (ding t)))))))))))) | |
361 | ||
362 | (defun perl-indent-line (&optional nochange parse-start) | |
363 | "Indent current line as Perl code. Return the amount the indentation | |
364 | changed by, or (parse-state) if line starts in a quoted string." | |
365 | (let ((case-fold-search nil) | |
366 | (pos (- (point-max) (point))) | |
367 | (bof (or parse-start (save-excursion (perl-beginning-of-function)))) | |
368 | beg indent shift-amt) | |
369 | (beginning-of-line) | |
370 | (setq beg (point)) | |
371 | (setq shift-amt | |
372 | (cond ((= (char-after bof) ?=) 0) | |
373 | ((listp (setq indent (calculate-perl-indent bof))) indent) | |
374 | ((looking-at (or nochange perl-nochange)) 0) | |
375 | (t | |
376 | (skip-chars-forward " \t\f") | |
377 | (cond ((looking-at "\\(\\w\\|\\s_\\)+:") | |
378 | (setq indent (max 1 (+ indent perl-label-offset)))) | |
379 | ((= (following-char) ?}) | |
380 | (setq indent (- indent perl-indent-level))) | |
381 | ((= (following-char) ?{) | |
382 | (setq indent (+ indent perl-brace-offset)))) | |
383 | (- indent (current-column))))) | |
384 | (skip-chars-forward " \t\f") | |
385 | (if (and (numberp shift-amt) (/= 0 shift-amt)) | |
386 | (progn (delete-region beg (point)) | |
387 | (indent-to indent))) | |
388 | ;; If initial point was within line's indentation, | |
389 | ;; position after the indentation. Else stay at same point in text. | |
390 | (if (> (- (point-max) pos) (point)) | |
391 | (goto-char (- (point-max) pos))) | |
392 | shift-amt)) | |
393 | ||
394 | (defun calculate-perl-indent (&optional parse-start) | |
395 | "Return appropriate indentation for current line as Perl code. | |
396 | In usual case returns an integer: the column to indent to. | |
397 | Returns (parse-state) if line starts inside a string." | |
398 | (save-excursion | |
399 | (beginning-of-line) | |
400 | (let ((indent-point (point)) | |
401 | (case-fold-search nil) | |
402 | (colon-line-end 0) | |
403 | state containing-sexp) | |
404 | (if parse-start ;used to avoid searching | |
405 | (goto-char parse-start) | |
406 | (perl-beginning-of-function)) | |
407 | (while (< (point) indent-point) ;repeat until right sexp | |
408 | (setq parse-start (point)) | |
409 | (setq state (parse-partial-sexp (point) indent-point 0)) | |
410 | ; state = (depth_in_parens innermost_containing_list last_complete_sexp | |
411 | ; string_terminator_or_nil inside_commentp following_quotep | |
412 | ; minimum_paren-depth_this_scan) | |
413 | ; Parsing stops if depth in parentheses becomes equal to third arg. | |
414 | (setq containing-sexp (nth 1 state))) | |
415 | (cond ((nth 3 state) state) ; In a quoted string? | |
416 | ((null containing-sexp) ; Line is at top level. | |
417 | (skip-chars-forward " \t\f") | |
418 | (if (= (following-char) ?{) | |
419 | 0 ; move to beginning of line if it starts a function body | |
420 | ;; indent a little if this is a continuation line | |
421 | (perl-backward-to-noncomment) | |
422 | (if (or (bobp) | |
423 | (memq (preceding-char) '(?\; ?\}))) | |
424 | 0 perl-continued-statement-offset))) | |
425 | ((/= (char-after containing-sexp) ?{) | |
426 | ;; line is expression, not statement: | |
427 | ;; indent to just after the surrounding open. | |
428 | (goto-char (1+ containing-sexp)) | |
429 | (current-column)) | |
430 | (t | |
431 | ;; Statement level. Is it a continuation or a new statement? | |
432 | ;; Find previous non-comment character. | |
433 | (perl-backward-to-noncomment) | |
434 | ;; Back up over label lines, since they don't | |
435 | ;; affect whether our line is a continuation. | |
436 | (while (or (eq (preceding-char) ?\,) | |
437 | (and (eq (preceding-char) ?:) | |
438 | (memq (char-syntax (char-after (- (point) 2))) | |
439 | '(?w ?_)))) | |
440 | (if (eq (preceding-char) ?\,) | |
441 | (perl-backward-to-start-of-continued-exp containing-sexp)) | |
442 | (beginning-of-line) | |
443 | (perl-backward-to-noncomment)) | |
444 | ;; Now we get the answer. | |
445 | (if (not (memq (preceding-char) '(?\; ?\} ?\{))) | |
446 | ;; This line is continuation of preceding line's statement; | |
447 | ;; indent perl-continued-statement-offset more than the | |
448 | ;; previous line of the statement. | |
449 | (progn | |
450 | (perl-backward-to-start-of-continued-exp containing-sexp) | |
451 | (+ perl-continued-statement-offset (current-column) | |
452 | (if (save-excursion (goto-char indent-point) | |
453 | (looking-at "[ \t]*{")) | |
454 | perl-continued-brace-offset 0))) | |
455 | ;; This line starts a new statement. | |
456 | ;; Position at last unclosed open. | |
457 | (goto-char containing-sexp) | |
458 | (or | |
459 | ;; If open paren is in col 0, close brace is special | |
460 | (and (bolp) | |
461 | (save-excursion (goto-char indent-point) | |
462 | (looking-at "[ \t]*}")) | |
463 | perl-indent-level) | |
464 | ;; Is line first statement after an open-brace? | |
465 | ;; If no, find that first statement and indent like it. | |
466 | (save-excursion | |
467 | (forward-char 1) | |
468 | ;; Skip over comments and labels following openbrace. | |
469 | (while (progn | |
470 | (skip-chars-forward " \t\f\n") | |
471 | (cond ((looking-at ";?#") | |
472 | (forward-line 1) t) | |
473 | ((looking-at "\\(\\w\\|\\s_\\)+:") | |
474 | (save-excursion | |
475 | (end-of-line) | |
476 | (setq colon-line-end (point))) | |
477 | (search-forward ":"))))) | |
478 | ;; The first following code counts | |
479 | ;; if it is before the line we want to indent. | |
480 | (and (< (point) indent-point) | |
481 | (if (> colon-line-end (point)) | |
482 | (- (current-indentation) perl-label-offset) | |
483 | (current-column)))) | |
484 | ;; If no previous statement, | |
485 | ;; indent it relative to line brace is on. | |
486 | ;; For open paren in column zero, don't let statement | |
487 | ;; start there too. If perl-indent-level is zero, | |
488 | ;; use perl-brace-offset + perl-continued-statement-offset | |
489 | ;; For open-braces not the first thing in a line, | |
490 | ;; add in perl-brace-imaginary-offset. | |
491 | (+ (if (and (bolp) (zerop perl-indent-level)) | |
492 | (+ perl-brace-offset perl-continued-statement-offset) | |
493 | perl-indent-level) | |
494 | ;; Move back over whitespace before the openbrace. | |
495 | ;; If openbrace is not first nonwhite thing on the line, | |
496 | ;; add the perl-brace-imaginary-offset. | |
497 | (progn (skip-chars-backward " \t") | |
498 | (if (bolp) 0 perl-brace-imaginary-offset)) | |
499 | ;; If the openbrace is preceded by a parenthesized exp, | |
500 | ;; move to the beginning of that; | |
501 | ;; possibly a different line | |
502 | (progn | |
503 | (if (eq (preceding-char) ?\)) | |
504 | (forward-sexp -1)) | |
505 | ;; Get initial indentation of the line we are on. | |
506 | (current-indentation)))))))))) | |
507 | ||
508 | (defun perl-backward-to-noncomment () | |
509 | "Move point backward to after the first non-white-space, skipping comments." | |
510 | (interactive) | |
511 | (let (opoint stop) | |
512 | (while (not stop) | |
513 | (setq opoint (point)) | |
514 | (beginning-of-line) | |
515 | (if (re-search-forward comment-start-skip opoint 'move 1) | |
516 | (progn (goto-char (match-end 1)) | |
517 | (skip-chars-forward ";"))) | |
518 | (skip-chars-backward " \t\f") | |
519 | (setq stop (or (bobp) | |
520 | (not (bolp)) | |
521 | (forward-char -1)))))) | |
522 | ||
523 | (defun perl-backward-to-start-of-continued-exp (lim) | |
524 | (if (= (preceding-char) ?\)) | |
525 | (forward-sexp -1)) | |
526 | (beginning-of-line) | |
527 | (if (<= (point) lim) | |
528 | (goto-char (1+ lim))) | |
529 | (skip-chars-forward " \t\f")) | |
530 | \f | |
531 | ;; note: this may be slower than the c-mode version, but I can understand it. | |
532 | (defun indent-perl-exp () | |
533 | "Indent each line of the Perl grouping following point." | |
534 | (interactive) | |
535 | (let* ((case-fold-search nil) | |
536 | (oldpnt (point-marker)) | |
537 | (bof-mark (save-excursion | |
538 | (end-of-line 2) | |
539 | (perl-beginning-of-function) | |
540 | (point-marker))) | |
541 | eol last-mark lsexp-mark delta) | |
542 | (if (= (char-after (marker-position bof-mark)) ?=) | |
543 | (message "Can't indent a format statement") | |
544 | (message "Indenting Perl expression...") | |
545 | (save-excursion (end-of-line) (setq eol (point))) | |
546 | (save-excursion ; locate matching close paren | |
547 | (while (and (not (eobp)) (<= (point) eol)) | |
548 | (parse-partial-sexp (point) (point-max) 0)) | |
549 | (setq last-mark (point-marker))) | |
550 | (setq lsexp-mark bof-mark) | |
551 | (beginning-of-line) | |
552 | (while (< (point) (marker-position last-mark)) | |
553 | (setq delta (perl-indent-line nil (marker-position bof-mark))) | |
554 | (if (numberp delta) ; unquoted start-of-line? | |
555 | (progn | |
556 | (if (eolp) | |
557 | (delete-horizontal-space)) | |
558 | (setq lsexp-mark (point-marker)))) | |
559 | (end-of-line) | |
560 | (setq eol (point)) | |
561 | (if (nth 4 (parse-partial-sexp (marker-position lsexp-mark) eol)) | |
562 | (progn ; line ends in a comment | |
563 | (beginning-of-line) | |
564 | (if (or (not (looking-at "\\s-*;?#")) | |
565 | (listp delta) | |
566 | (and (/= 0 delta) | |
567 | (= (- (current-indentation) delta) comment-column))) | |
568 | (if (re-search-forward comment-start-skip eol t) | |
569 | (indent-for-comment))))) ; indent existing comment | |
570 | (forward-line 1)) | |
571 | (goto-char (marker-position oldpnt)) | |
572 | (message "Indenting Perl expression...done")))) | |
573 | \f | |
574 | (defun perl-beginning-of-function (&optional arg) | |
575 | "Move backward to next beginning-of-function, or as far as possible. | |
576 | With argument, repeat that many times; negative args move forward. | |
577 | Returns new value of point in all cases." | |
578 | (interactive "p") | |
579 | (or arg (setq arg 1)) | |
580 | (if (< arg 0) (forward-char 1)) | |
581 | (and (/= arg 0) | |
582 | (re-search-backward "^\\s(\\|^\\s-*sub\\b[^{]+{\\|^\\s-*format\\b[^=]*=\\|^\\." | |
583 | nil 'move arg) | |
584 | (goto-char (1- (match-end 0)))) | |
585 | (point)) | |
586 | ||
587 | ;; note: this routine is adapted directly from emacs lisp.el, end-of-defun; | |
588 | ;; no bugs have been removed :-) | |
589 | (defun perl-end-of-function (&optional arg) | |
590 | "Move forward to next end-of-function. | |
591 | The end of a function is found by moving forward from the beginning of one. | |
592 | With argument, repeat that many times; negative args move backward." | |
593 | (interactive "p") | |
594 | (or arg (setq arg 1)) | |
595 | (let ((first t)) | |
596 | (while (and (> arg 0) (< (point) (point-max))) | |
597 | (let ((pos (point)) npos) | |
598 | (while (progn | |
599 | (if (and first | |
600 | (progn | |
601 | (forward-char 1) | |
602 | (perl-beginning-of-function 1) | |
603 | (not (bobp)))) | |
604 | nil | |
605 | (or (bobp) (forward-char -1)) | |
606 | (perl-beginning-of-function -1)) | |
607 | (setq first nil) | |
608 | (forward-list 1) | |
609 | (skip-chars-forward " \t") | |
610 | (if (looking-at "[#\n]") | |
611 | (forward-line 1)) | |
612 | (<= (point) pos)))) | |
613 | (setq arg (1- arg))) | |
614 | (while (< arg 0) | |
615 | (let ((pos (point))) | |
616 | (perl-beginning-of-function 1) | |
617 | (forward-sexp 1) | |
618 | (forward-line 1) | |
619 | (if (>= (point) pos) | |
620 | (if (progn (perl-beginning-of-function 2) (not (bobp))) | |
621 | (progn | |
622 | (forward-list 1) | |
623 | (skip-chars-forward " \t") | |
624 | (if (looking-at "[#\n]") | |
625 | (forward-line 1))) | |
626 | (goto-char (point-min))))) | |
627 | (setq arg (1+ arg))))) | |
628 | ||
629 | (defun mark-perl-function () | |
630 | "Put mark at end of Perl function, point at beginning." | |
631 | (interactive) | |
632 | (push-mark (point)) | |
633 | (perl-end-of-function) | |
634 | (push-mark (point)) | |
635 | (perl-beginning-of-function) | |
636 | (backward-paragraph)) | |
637 | ||
638 | ;;;;;;;; That's all, folks! ;;;;;;;;; |