| 1 | ;;; perl-mode.el --- Perl code editing commands for GNU Emacs |
| 2 | |
| 3 | ;; Copyright (C) 1990 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;; Author: William F. Mann |
| 6 | ;; Adapted-By: ESR |
| 7 | ;; Keywords: languages |
| 8 | |
| 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 | |
| 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. |
| 27 | |
| 28 | ;;; Commentary: |
| 29 | |
| 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 | |
| 64 | ;; Known problems (these are all caused by limitations in the Emacs Lisp |
| 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): |
| 67 | ;; 1) Regular expression delimitors do not act as quotes, so special |
| 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$//; |
| 97 | |
| 98 | ;;; Code: |
| 99 | |
| 100 | (defvar perl-mode-abbrev-table nil |
| 101 | "Abbrev table in use in perl-mode buffers.") |
| 102 | (define-abbrev-table 'perl-mode-abbrev-table ()) |
| 103 | |
| 104 | (defvar perl-mode-map () |
| 105 | "Keymap used in Perl mode.") |
| 106 | (if perl-mode-map |
| 107 | () |
| 108 | (setq perl-mode-map (make-sparse-keymap)) |
| 109 | (define-key perl-mode-map "{" 'electric-perl-terminator) |
| 110 | (define-key perl-mode-map "}" 'electric-perl-terminator) |
| 111 | (define-key perl-mode-map ";" 'electric-perl-terminator) |
| 112 | (define-key perl-mode-map ":" 'electric-perl-terminator) |
| 113 | (define-key perl-mode-map "\e\C-a" 'perl-beginning-of-function) |
| 114 | (define-key perl-mode-map "\e\C-e" 'perl-end-of-function) |
| 115 | (define-key perl-mode-map "\e\C-h" 'mark-perl-function) |
| 116 | (define-key perl-mode-map "\e\C-q" 'indent-perl-exp) |
| 117 | (define-key perl-mode-map "\177" 'backward-delete-char-untabify) |
| 118 | (define-key perl-mode-map "\t" 'perl-indent-command)) |
| 119 | |
| 120 | (autoload 'c-macro-expand "cmacexp" |
| 121 | "Display the result of expanding all C macros occurring in the region. |
| 122 | The expansion is entirely correct because it uses the C preprocessor." |
| 123 | t) |
| 124 | |
| 125 | (defvar perl-mode-syntax-table nil |
| 126 | "Syntax table in use in perl-mode buffers.") |
| 127 | |
| 128 | (if perl-mode-syntax-table |
| 129 | () |
| 130 | (setq perl-mode-syntax-table (make-syntax-table (standard-syntax-table))) |
| 131 | (modify-syntax-entry ?\n ">" perl-mode-syntax-table) |
| 132 | (modify-syntax-entry ?# "<" perl-mode-syntax-table) |
| 133 | (modify-syntax-entry ?$ "/" 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-\\);?#+ *") |
| 246 | (make-local-variable 'comment-indent-function) |
| 247 | (setq comment-indent-function 'perl-comment-indent) |
| 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! ;;;;;;;;; |