pascal.el 53.8 KB
Newer Older
Richard M. Stallman's avatar
Richard M. Stallman committed
1
;;; pascal.el --- major mode for editing pascal source in Emacs
Richard M. Stallman's avatar
Richard M. Stallman committed
2

Richard M. Stallman's avatar
Richard M. Stallman committed
3
;; Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
Richard M. Stallman's avatar
Richard M. Stallman committed
4

Richard M. Stallman's avatar
Richard M. Stallman committed
5 6
;; Author: Espen Skoglund (espensk@stud.cs.uit.no)
;; Keywords: languages
Richard M. Stallman's avatar
Richard M. Stallman committed
7

Richard M. Stallman's avatar
Richard M. Stallman committed
8
;; This file is part of GNU Emacs.
Richard M. Stallman's avatar
Richard M. Stallman committed
9

Erik Naggum's avatar
Erik Naggum committed
10
;; GNU Emacs is free software; you can redistribute it and/or modify
Richard M. Stallman's avatar
Richard M. Stallman committed
11
;; it under the terms of the GNU General Public License as published by
Erik Naggum's avatar
Erik Naggum committed
12 13
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
Richard M. Stallman's avatar
Richard M. Stallman committed
14

Erik Naggum's avatar
Erik Naggum committed
15
;; GNU Emacs is distributed in the hope that it will be useful,
Richard M. Stallman's avatar
Richard M. Stallman committed
16 17 18
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.
Richard M. Stallman's avatar
Richard M. Stallman committed
19

Richard M. Stallman's avatar
Richard M. Stallman committed
20
;; You should have received a copy of the GNU General Public License
Erik Naggum's avatar
Erik Naggum committed
21 22 23
;; along with GNU Emacs; see the file COPYING.  If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
Richard M. Stallman's avatar
Richard M. Stallman committed
24 25 26

;;; Commentary:

Erik Naggum's avatar
Erik Naggum committed
27 28
;; USAGE
;; =====
Richard M. Stallman's avatar
Richard M. Stallman committed
29

Erik Naggum's avatar
Erik Naggum committed
30 31 32 33
;; Emacs should enter Pascal mode when you find a Pascal source file.
;; When you have entered Pascal mode, you may get more info by pressing
;; C-h m. You may also get online help describing various functions by:
;; C-h f <Name of function you want described>
Richard M. Stallman's avatar
Richard M. Stallman committed
34

Erik Naggum's avatar
Erik Naggum committed
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
;; If you want to customize Pascal mode to fit you better, you may add
;; these lines (the values of the variables presented here are the defaults):
;;
;; ;; User customization for Pascal mode
;; (setq pascal-indent-level       3
;;       pascal-case-indent        2
;;       pascal-auto-newline       nil
;;       pascal-tab-always-indent  t
;;       pascal-auto-endcomments   t
;;       pascal-auto-lineup        '(all)
;;       pascal-toggle-completions nil
;;       pascal-type-keywords      '("array" "file" "packed" "char" 
;; 				      "integer" "real" "string" "record")
;;       pascal-start-keywords     '("begin" "end" "function" "procedure"
;; 				      "repeat" "until" "while" "read" "readln"
;; 				      "reset" "rewrite" "write" "writeln")
;;       pascal-separator-keywords '("downto" "else" "mod" "div" "then"))
Richard M. Stallman's avatar
Richard M. Stallman committed
52

Erik Naggum's avatar
Erik Naggum committed
53 54 55 56 57 58 59
;; KNOWN BUGS / BUGREPORTS
;; =======================
;; As far as I know, there are no bugs in the current version of this
;; package.  This may not be true however, since I never use this mode
;; myself and therefore would never notice them anyway.   If you do
;; find any bugs, you may submit them to: espensk@stud.cs.uit.no
;; as well as to bug-gnu-emacs@prep.ai.mit.edu.
Richard M. Stallman's avatar
Richard M. Stallman committed
60 61

;;; Code:
Richard M. Stallman's avatar
Richard M. Stallman committed
62 63 64 65 66 67 68

(defvar pascal-mode-abbrev-table nil
  "Abbrev table in use in Pascal-mode buffers.")
(define-abbrev-table 'pascal-mode-abbrev-table ())

(defvar pascal-mode-map ()
  "Keymap used in Pascal mode.")
Richard M. Stallman's avatar
Richard M. Stallman committed
69 70 71 72 73 74 75
(if pascal-mode-map
    ()
  (setq pascal-mode-map (make-sparse-keymap))
  (define-key pascal-mode-map ";"        'electric-pascal-semi-or-dot)
  (define-key pascal-mode-map "."        'electric-pascal-semi-or-dot)
  (define-key pascal-mode-map ":"        'electric-pascal-colon)
  (define-key pascal-mode-map "="        'electric-pascal-equal)
76
  (define-key pascal-mode-map "#"        'electric-pascal-hash)
Richard M. Stallman's avatar
Richard M. Stallman committed
77 78
  (define-key pascal-mode-map "\r"       'electric-pascal-terminate-line)
  (define-key pascal-mode-map "\t"       'electric-pascal-tab)
79 80
  (define-key pascal-mode-map "\M-\t"    'pascal-complete-word)
  (define-key pascal-mode-map "\M-?"     'pascal-show-completions)
Richard M. Stallman's avatar
Richard M. Stallman committed
81
  (define-key pascal-mode-map "\177"     'backward-delete-char-untabify)
82 83
  (define-key pascal-mode-map "\M-\C-h"  'pascal-mark-defun)
  (define-key pascal-mode-map "\C-c\C-b" 'pascal-insert-block)
Richard M. Stallman's avatar
Richard M. Stallman committed
84 85 86
  (define-key pascal-mode-map "\M-*"     'pascal-star-comment)
  (define-key pascal-mode-map "\C-c\C-c" 'pascal-comment-area)
  (define-key pascal-mode-map "\C-c\C-u" 'pascal-uncomment-area)
87 88 89 90
  (define-key pascal-mode-map "\M-\C-a"  'pascal-beg-of-defun)
  (define-key pascal-mode-map "\M-\C-e"  'pascal-end-of-defun)
  (define-key pascal-mode-map "\C-c\C-d" 'pascal-goto-defun)
  (define-key pascal-mode-map "\C-c\C-o" 'pascal-outline)
Richard M. Stallman's avatar
Richard M. Stallman committed
91 92
;;; A command to change the whole buffer won't be used terribly
;;; often, so no need for a key binding.
Richard M. Stallman's avatar
Richard M. Stallman committed
93 94 95 96
;  (define-key pascal-mode-map "\C-cd"    'pascal-downcase-keywords)
;  (define-key pascal-mode-map "\C-cu"    'pascal-upcase-keywords)
;  (define-key pascal-mode-map "\C-cc"    'pascal-capitalize-keywords)
  )
97 98 99 100

(defvar pascal-imenu-generic-expression
  '("^[ \t]*\\(function\\|procedure\\)[ \t\n]+\\([a-zA-Z0-9_.:]+\\)" . (2))
  "Imenu expression for Pascal-mode.  See `imenu-generic-expression'.")
Richard M. Stallman's avatar
Richard M. Stallman committed
101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
  
(defvar pascal-keywords
  '("and" "array" "begin" "case" "const" "div" "do" "downto" "else" "end" 
    "file" "for" "function" "goto" "if" "in" "label" "mod" "nil" "not" "of" 
    "or" "packed" "procedure" "program" "record" "repeat" "set" "then" "to" 
    "type" "until" "var" "while" "with"
    ;; The following are not standard in pascal, but widely used.
    "get" "put" "input" "output" "read" "readln" "reset" "rewrite" "write"
    "writeln"))

;;;
;;; Regular expressions used to calculate indent, etc.
;;;
(defconst pascal-symbol-re      "\\<[a-zA-Z_][a-zA-Z_0-9.]*\\>")
(defconst pascal-beg-block-re   "\\<\\(begin\\|case\\|record\\|repeat\\)\\>")
(defconst pascal-end-block-re   "\\<\\(end\\|until\\)\\>")
(defconst pascal-declaration-re "\\<\\(const\\|label\\|type\\|var\\)\\>")
(defconst pascal-defun-re       "\\<\\(function\\|procedure\\|program\\)\\>")
119
(defconst pascal-sub-block-re   "\\<\\(if\\|else\\|for\\|while\\|with\\)\\>")
120
(defconst pascal-noindent-re    "\\<\\(begin\\|end\\|until\\|else\\)\\>")
Richard M. Stallman's avatar
Richard M. Stallman committed
121 122 123 124 125 126 127
(defconst pascal-nosemi-re      "\\<\\(begin\\|repeat\\|then\\|do\\|else\\)\\>")
(defconst pascal-autoindent-lines-re
  "\\<\\(label\\|var\\|type\\|const\\|until\\|end\\|begin\\|repeat\\|else\\)\\>")

;;; Strings used to mark beginning and end of excluded text
(defconst pascal-exclude-str-start "{-----\\/----- EXCLUDED -----\\/-----")
(defconst pascal-exclude-str-end " -----/\\----- EXCLUDED -----/\\-----}")
Richard M. Stallman's avatar
Richard M. Stallman committed
128 129 130 131 132 133 134

(defvar pascal-mode-syntax-table nil
  "Syntax table in use in Pascal-mode buffers.")

(if pascal-mode-syntax-table
    ()
  (setq pascal-mode-syntax-table (make-syntax-table))
135
  (modify-syntax-entry ?\\ "."   pascal-mode-syntax-table)
Richard M. Stallman's avatar
Richard M. Stallman committed
136 137
  (modify-syntax-entry ?( "()1"  pascal-mode-syntax-table)  
  (modify-syntax-entry ?) ")(4"  pascal-mode-syntax-table)
Richard M. Stallman's avatar
Richard M. Stallman committed
138
  (modify-syntax-entry ?* ". 23" pascal-mode-syntax-table)
Richard M. Stallman's avatar
Richard M. Stallman committed
139 140 141 142 143 144 145 146 147 148 149 150 151
  (modify-syntax-entry ?{ "<"    pascal-mode-syntax-table)
  (modify-syntax-entry ?} ">"    pascal-mode-syntax-table)
  (modify-syntax-entry ?+ "."    pascal-mode-syntax-table)
  (modify-syntax-entry ?- "."    pascal-mode-syntax-table)
  (modify-syntax-entry ?= "."    pascal-mode-syntax-table)
  (modify-syntax-entry ?% "."    pascal-mode-syntax-table)
  (modify-syntax-entry ?< "."    pascal-mode-syntax-table)
  (modify-syntax-entry ?> "."    pascal-mode-syntax-table)
  (modify-syntax-entry ?& "."    pascal-mode-syntax-table)
  (modify-syntax-entry ?| "."    pascal-mode-syntax-table)
  (modify-syntax-entry ?_ "w"    pascal-mode-syntax-table)
  (modify-syntax-entry ?\' "\""  pascal-mode-syntax-table))

152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172
(defvar pascal-font-lock-keywords
  (list
   '("^[ \t]*\\(function\\|pro\\(cedure\\|gram\\)\\)\\>[ \t]*\\(\\sw+\\)?"
     (1 font-lock-keyword-face) (3 font-lock-function-name-face nil t))
;   ("type" "const" "real" "integer" "char" "boolean" "var"
;    "record" "array" "file")
   (cons (concat "\\<\\(array\\|boolean\\|c\\(har\\|onst\\)\\|file\\|"
		 "integer\\|re\\(al\\|cord\\)\\|type\\|var\\)\\>")
	 'font-lock-type-face)
   '("\\<\\(label\\|external\\|forward\\)\\>" . font-lock-reference-face)
   '("\\<\\([0-9]+\\)[ \t]*:" 1 font-lock-reference-face)
;   ("of" "to" "for" "if" "then" "else" "case" "while"
;    "do" "until" "and" "or" "not" "in" "with" "repeat" "begin" "end")
   (concat "\\<\\("
	   "and\\|begin\\|case\\|do\\|e\\(lse\\|nd\\)\\|for\\|i[fn]\\|"
	   "not\\|o[fr]\\|repeat\\|t\\(hen\\|o\\)\\|until\\|w\\(hile\\|ith\\)"
	   "\\)\\>")
   '("\\<\\(goto\\)\\>[ \t]*\\([0-9]+\\)?"
     (1 font-lock-keyword-face) (2 font-lock-reference-face nil t)))
  "Additional expressions to highlight in Pascal mode.")

Richard M. Stallman's avatar
Richard M. Stallman committed
173
(defvar pascal-indent-level 3
Richard M. Stallman's avatar
Richard M. Stallman committed
174
  "*Indentation of Pascal statements with respect to containing block.")
175

Richard M. Stallman's avatar
Richard M. Stallman committed
176 177
(defvar pascal-case-indent 2
  "*Indentation for case statements.")
178

Richard M. Stallman's avatar
Richard M. Stallman committed
179
(defvar pascal-auto-newline nil
180 181
  "*Non-nil means automatically newline after semicolons and the punctuation
mark after an end.")
182

Richard M. Stallman's avatar
Richard M. Stallman committed
183 184 185
(defvar pascal-tab-always-indent t
  "*Non-nil means TAB in Pascal mode should always reindent the current line,
regardless of where in the line point is when the TAB command is used.")
186

Richard M. Stallman's avatar
Richard M. Stallman committed
187 188 189
(defvar pascal-auto-endcomments t
  "*Non-nil means a comment { ... } is set after the ends which ends cases and
functions. The name of the function or case will be set between the braces.")
190 191 192 193 194 195 196 197 198

(defvar pascal-auto-lineup '(all)
  "*List of contexts where auto lineup of :'s or ='s should be done.
Elements can be of type: 'paramlist', 'declaration' or 'case', which will
do auto lineup in parameterlist, declarations or case-statements
respectively. The word 'all' will do all lineups. '(case paramlist) for
instance will do lineup in case-statements and parameterlist, while '(all)
will do all lineups.")

Richard M. Stallman's avatar
Richard M. Stallman committed
199
(defvar pascal-toggle-completions nil
200 201 202 203
  "*Non-nil means \\<pascal-mode-map>\\[pascal-complete-word] should try all possible completions one by one.
Repeated use of \\[pascal-complete-word] will show you all of them.
Normally, when there is more than one possible completion,
it displays a list of all possible completions.")
204

Richard M. Stallman's avatar
Richard M. Stallman committed
205 206 207 208 209
(defvar pascal-type-keywords
  '("array" "file" "packed" "char" "integer" "real" "string" "record")
  "*Keywords for types used when completing a word in a declaration or parmlist.
\(eg. integer, real, char.)  The types defined within the Pascal program
will be completed runtime, and should not be added to this list.")
210

Richard M. Stallman's avatar
Richard M. Stallman committed
211 212 213 214 215 216 217
(defvar pascal-start-keywords
  '("begin" "end" "function" "procedure" "repeat" "until" "while"
    "read" "readln" "reset" "rewrite" "write" "writeln")
  "*Keywords to complete when standing at the first word of a statement.
\(eg. begin, repeat, until, readln.)
The procedures and variables defined within the Pascal program
will be completed runtime and should not be added to this list.")
218

219
(defvar pascal-separator-keywords
Richard M. Stallman's avatar
Richard M. Stallman committed
220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
  '("downto" "else" "mod" "div" "then")
  "*Keywords to complete when NOT standing at the first word of a statement.
\(eg. downto, else, mod, then.) 
Variables and function names defined within the
Pascal program are completed runtime and should not be added to this list.")

;;;
;;;  Macros
;;;

(defsubst pascal-get-beg-of-line (&optional arg)
  (save-excursion
    (beginning-of-line arg)
    (point)))

(defsubst pascal-get-end-of-line (&optional arg)
  (save-excursion
    (end-of-line arg)
    (point)))

(defun pascal-declaration-end ()
  (let ((nest 1))
    (while (and (> nest 0)
		(re-search-forward 
		 "[:=]\\|\\(\\<record\\>\\)\\|\\(\\<end\\>\\)" 
		 (save-excursion (end-of-line 2) (point)) t))
      (cond ((match-beginning 1) (setq nest (1+ nest)))
247 248
	    ((match-beginning 2) (setq nest (1- nest)))
	    ((looking-at "[^(\n]+)") (setq nest 0))))))
Richard M. Stallman's avatar
Richard M. Stallman committed
249

250

Richard M. Stallman's avatar
Richard M. Stallman committed
251 252 253
(defun pascal-declaration-beg ()
  (let ((nest 1))
    (while (and (> nest 0)
254
		(re-search-backward "[:=]\\|\\<\\(type\\|var\\|label\\|const\\)\\>\\|\\(\\<record\\>\\)\\|\\(\\<end\\>\\)" (pascal-get-beg-of-line 0) t))
Richard M. Stallman's avatar
Richard M. Stallman committed
255 256 257 258
      (cond ((match-beginning 1) (setq nest 0))
	    ((match-beginning 2) (setq nest (1- nest)))
	    ((match-beginning 3) (setq nest (1+ nest)))))
    (= nest 0)))
259

Richard M. Stallman's avatar
Richard M. Stallman committed
260 261 262 263 264
  
(defsubst pascal-within-string ()
  (save-excursion
    (nth 3 (parse-partial-sexp (pascal-get-beg-of-line) (point)))))

Richard M. Stallman's avatar
Richard M. Stallman committed
265 266 267

;;;###autoload
(defun pascal-mode ()
Richard M. Stallman's avatar
Richard M. Stallman committed
268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294
  "Major mode for editing Pascal code. \\<pascal-mode-map>
TAB indents for Pascal code.  Delete converts tabs to spaces as it moves back.

\\[pascal-complete-word] completes the word around current point with respect \
to position in code
\\[pascal-show-completions] shows all possible completions at this point.

Other useful functions are:

\\[pascal-mark-defun]\t- Mark function.
\\[pascal-insert-block]\t- insert begin ... end;
\\[pascal-star-comment]\t- insert (* ... *)
\\[pascal-comment-area]\t- Put marked area in a comment, fixing nested comments.
\\[pascal-uncomment-area]\t- Uncomment an area commented with \
\\[pascal-comment-area].
\\[pascal-beg-of-defun]\t- Move to beginning of current function.
\\[pascal-end-of-defun]\t- Move to end of current function.
\\[pascal-goto-defun]\t- Goto function prompted for in the minibuffer.
\\[pascal-outline]\t- Enter pascal-outline-mode (see also pascal-outline).

Variables controlling indentation/edit style:

 pascal-indent-level      (default 3)
    Indentation of Pascal statements with respect to containing block.
 pascal-case-indent       (default 2)
    Indentation for case statements.
 pascal-auto-newline      (default nil)
295 296
    Non-nil means automatically newline after semicolons and the punctuation
    mark after an end.
297
 pascal-tab-always-indent (default t)
Richard M. Stallman's avatar
Richard M. Stallman committed
298 299
    Non-nil means TAB in Pascal mode should always reindent the current line,
    regardless of where in the line point is when the TAB command is used.
Richard M. Stallman's avatar
Richard M. Stallman committed
300 301 302
 pascal-auto-endcomments  (default t)
    Non-nil means a comment { ... } is set after the ends which ends cases and
    functions. The name of the function or case will be set between the braces.
303 304
 pascal-auto-lineup       (default t)
    List of contexts where auto lineup of :'s or ='s hould be done.
Richard M. Stallman's avatar
Richard M. Stallman committed
305 306

See also the user variables pascal-type-keywords, pascal-start-keywords and
307
pascal-separator-keywords.
Richard M. Stallman's avatar
Richard M. Stallman committed
308 309 310 311 312 313 314 315 316 317 318 319

Turning on Pascal mode calls the value of the variable pascal-mode-hook with
no args, if that value is non-nil."
  (interactive)
  (kill-all-local-variables)
  (use-local-map pascal-mode-map)
  (setq major-mode 'pascal-mode)
  (setq mode-name "Pascal")
  (setq local-abbrev-table pascal-mode-abbrev-table)
  (set-syntax-table pascal-mode-syntax-table)
  (make-local-variable 'indent-line-function)
  (setq indent-line-function 'pascal-indent-line)
Richard M. Stallman's avatar
Richard M. Stallman committed
320
  (setq comment-indent-function 'pascal-indent-comment)
Richard M. Stallman's avatar
Richard M. Stallman committed
321
  (make-local-variable 'parse-sexp-ignore-comments)
322
  (setq parse-sexp-ignore-comments nil)
Richard M. Stallman's avatar
Richard M. Stallman committed
323 324
  (make-local-variable 'case-fold-search)
  (setq case-fold-search t)
325 326
  (make-local-variable 'comment-start)
  (setq comment-start "{")
327 328 329 330
  (make-local-variable 'comment-start-skip)
  (setq comment-start-skip "(\\*+ *\\|{ *")
  (make-local-variable 'comment-end)
  (setq comment-end "}")
331
  ;; Font lock support
332 333
  (make-local-variable 'font-lock-defaults)
  (setq font-lock-defaults '(pascal-font-lock-keywords nil t))
334 335 336
  ;; Imenu support
  (make-local-variable 'imenu-generic-expression)
  (setq imenu-generic-expression pascal-imenu-generic-expression)
Richard M. Stallman's avatar
Richard M. Stallman committed
337 338
  (run-hooks 'pascal-mode-hook))

Richard M. Stallman's avatar
Richard M. Stallman committed
339 340


Richard M. Stallman's avatar
Richard M. Stallman committed
341 342 343 344 345 346
;;;
;;;  Electric functions
;;;
(defun electric-pascal-terminate-line ()
  "Terminate line and indent next line."
  (interactive)
Richard M. Stallman's avatar
Richard M. Stallman committed
347
  ;; First, check if current line should be indented
Richard M. Stallman's avatar
Richard M. Stallman committed
348 349 350
  (save-excursion
    (beginning-of-line)
    (skip-chars-forward " \t")
Richard M. Stallman's avatar
Richard M. Stallman committed
351
    (if (looking-at pascal-autoindent-lines-re)
Richard M. Stallman's avatar
Richard M. Stallman committed
352
	(pascal-indent-line)))
Richard M. Stallman's avatar
Richard M. Stallman committed
353
  (delete-horizontal-space) ; Removes trailing whitespaces
Richard M. Stallman's avatar
Richard M. Stallman committed
354
  (newline)
Richard M. Stallman's avatar
Richard M. Stallman committed
355
  ;; Indent next line
Richard M. Stallman's avatar
Richard M. Stallman committed
356 357 358 359 360 361 362 363 364
  (pascal-indent-line)
  ;; Maybe we should set some endcomments
  (if pascal-auto-endcomments
      (pascal-set-auto-comments))
  ;; Check if we shall indent inside comment
  (let ((setstar nil))
    (save-excursion
      (forward-line -1)
      (skip-chars-forward " \t")
Richard M. Stallman's avatar
Richard M. Stallman committed
365
      (cond ((looking-at "\\*[ \t]+)")
Richard M. Stallman's avatar
Richard M. Stallman committed
366 367
	     ;; Delete region between `*' and `)' if there is only whitespaces.
	     (forward-char 1)
Richard M. Stallman's avatar
Richard M. Stallman committed
368
	     (delete-horizontal-space))
Richard M. Stallman's avatar
Richard M. Stallman committed
369 370 371 372 373
	    ((and (looking-at "(\\*\\|\\*[^)]")
		  (not (save-excursion
			 (search-forward "*)" (pascal-get-end-of-line) t))))
	     (setq setstar t))))
    ;; If last line was a star comment line then this one shall be too.
Richard M. Stallman's avatar
Richard M. Stallman committed
374 375 376
    (if (null setstar)	
	(pascal-indent-line)
      (insert "*  "))))
Richard M. Stallman's avatar
Richard M. Stallman committed
377 378


Richard M. Stallman's avatar
Richard M. Stallman committed
379 380
(defun electric-pascal-semi-or-dot ()
  "Insert `;' or `.' character and reindent the line."
Richard M. Stallman's avatar
Richard M. Stallman committed
381 382 383 384 385 386 387 388 389
  (interactive)
  (insert last-command-char)
  (save-excursion
    (beginning-of-line)
    (pascal-indent-line))
  (if pascal-auto-newline
      (electric-pascal-terminate-line)))

(defun electric-pascal-colon ()
Richard M. Stallman's avatar
Richard M. Stallman committed
390
  "Insert `:' and do all indentions except line indent on this line."
Richard M. Stallman's avatar
Richard M. Stallman committed
391 392
  (interactive)
  (insert last-command-char)
Richard M. Stallman's avatar
Richard M. Stallman committed
393 394 395 396 397 398 399 400 401
  ;; Do nothing if within string.
  (if (pascal-within-string)
      ()
    (save-excursion
      (beginning-of-line)
      (pascal-indent-line))
    (let ((pascal-tab-always-indent nil))
      (pascal-indent-command))))

Richard M. Stallman's avatar
Richard M. Stallman committed
402
(defun electric-pascal-equal ()
Richard M. Stallman's avatar
Richard M. Stallman committed
403
  "Insert `=', and do indention if within type declaration."
Richard M. Stallman's avatar
Richard M. Stallman committed
404 405
  (interactive)
  (insert last-command-char)
Richard M. Stallman's avatar
Richard M. Stallman committed
406
  (if (eq (car (pascal-calculate-indent)) 'declaration)
Richard M. Stallman's avatar
Richard M. Stallman committed
407 408 409
      (let ((pascal-tab-always-indent nil))
	(pascal-indent-command))))

410
(defun electric-pascal-hash ()
411
  "Insert `#', and indent to column 0 if this is a CPP directive."
412 413 414 415 416 417
  (interactive)
  (insert last-command-char)
  (if (save-excursion (beginning-of-line) (looking-at "^[ \t]*#"))
      (save-excursion (beginning-of-line)
		      (delete-horizontal-space))))

Richard M. Stallman's avatar
Richard M. Stallman committed
418
(defun electric-pascal-tab ()
Richard M. Stallman's avatar
Richard M. Stallman committed
419
  "Function called when TAB is pressed in Pascal mode."
Richard M. Stallman's avatar
Richard M. Stallman committed
420
  (interactive)
421 422 423 424
  ;; Do nothing if within a string or in a CPP directive.
  (if (or (pascal-within-string)
	  (and (not (bolp))
	       (save-excursion (beginning-of-line) (eq (following-char) ?#))))
Richard M. Stallman's avatar
Richard M. Stallman committed
425 426 427 428 429 430
      (insert "\t")
    ;; If pascal-tab-always-indent, indent the beginning of the line.
    (if pascal-tab-always-indent
	(save-excursion
	  (beginning-of-line)
	  (pascal-indent-line))
431 432 433 434 435
      (if (save-excursion
	    (skip-chars-backward " \t")
	    (bolp))
	  (pascal-indent-line)
	(insert "\t")))
Richard M. Stallman's avatar
Richard M. Stallman committed
436 437 438
    (pascal-indent-command)))


Richard M. Stallman's avatar
Richard M. Stallman committed
439 440 441 442 443

;;;
;;; Interactive functions
;;;
(defun pascal-insert-block ()
Richard M. Stallman's avatar
Richard M. Stallman committed
444
  "Insert Pascal begin ... end; block in the code with right indentation."
Richard M. Stallman's avatar
Richard M. Stallman committed
445 446 447 448 449 450 451 452 453 454 455
  (interactive)
  (pascal-indent-line)
  (insert "begin")
  (electric-pascal-terminate-line)
  (save-excursion
    (electric-pascal-terminate-line)
    (insert "end;")
    (beginning-of-line)
    (pascal-indent-line)))

(defun pascal-star-comment ()
Richard M. Stallman's avatar
Richard M. Stallman committed
456
  "Insert Pascal star comment at point."
Richard M. Stallman's avatar
Richard M. Stallman committed
457 458 459 460 461 462
  (interactive)
  (pascal-indent-line)
  (insert "(*")
  (electric-pascal-terminate-line)
  (save-excursion
    (electric-pascal-terminate-line)
Richard M. Stallman's avatar
Richard M. Stallman committed
463 464 465
    (delete-horizontal-space)
    (insert ")"))
  (insert "  "))
Richard M. Stallman's avatar
Richard M. Stallman committed
466

Richard M. Stallman's avatar
Richard M. Stallman committed
467
(defun pascal-mark-defun ()
Richard M. Stallman's avatar
Richard M. Stallman committed
468
  "Mark the current pascal function (or procedure).
Richard M. Stallman's avatar
Richard M. Stallman committed
469
This puts the mark at the end, and point at the beginning."
Richard M. Stallman's avatar
Richard M. Stallman committed
470 471
  (interactive)
  (push-mark (point))
Richard M. Stallman's avatar
Richard M. Stallman committed
472
  (pascal-end-of-defun)
Richard M. Stallman's avatar
Richard M. Stallman committed
473
  (push-mark (point))
Richard M. Stallman's avatar
Richard M. Stallman committed
474 475 476
  (pascal-beg-of-defun)
  (if (fboundp 'zmacs-activate-region)
      (zmacs-activate-region)))
Richard M. Stallman's avatar
Richard M. Stallman committed
477 478

(defun pascal-comment-area (start end)
Richard M. Stallman's avatar
Richard M. Stallman committed
479 480 481 482 483 484 485 486 487
  "Put the region into a Pascal comment.
The comments that are in this area are \"deformed\":
`*)' becomes `!(*' and `}' becomes `!{'.
These deformed comments are returned to normal if you use
\\[pascal-uncomment-area] to undo the commenting.

The commented area starts with `pascal-exclude-str-start', and ends with
`pascal-include-str-end'.  But if you change these variables,
\\[pascal-uncomment-area] won't recognize the comments."
Richard M. Stallman's avatar
Richard M. Stallman committed
488 489 490 491 492 493 494 495
  (interactive "r")
  (save-excursion
    ;; Insert start and endcomments
    (goto-char end)
    (if (and (save-excursion (skip-chars-forward " \t") (eolp))
	     (not (save-excursion (skip-chars-backward " \t") (bolp))))
	(forward-line 1)
      (beginning-of-line))
Richard M. Stallman's avatar
Richard M. Stallman committed
496
    (insert pascal-exclude-str-end)
Richard M. Stallman's avatar
Richard M. Stallman committed
497 498 499 500
    (setq end (point))
    (newline)
    (goto-char start)
    (beginning-of-line)
Richard M. Stallman's avatar
Richard M. Stallman committed
501
    (insert pascal-exclude-str-start)
Richard M. Stallman's avatar
Richard M. Stallman committed
502 503 504 505 506 507 508 509 510 511 512
    (newline)
    ;; Replace end-comments within commented area
    (goto-char end)
    (save-excursion
      (while (re-search-backward "\\*)" start t)
	(replace-match "!(*" t t)))
    (save-excursion
      (while (re-search-backward "}" start t)
	(replace-match "!{" t t)))))

(defun pascal-uncomment-area ()
Richard M. Stallman's avatar
Richard M. Stallman committed
513 514
  "Uncomment a commented area; change deformed comments back to normal.
This command does nothing if the pointer is not in a commented
Richard M. Stallman's avatar
Richard M. Stallman committed
515 516 517 518 519 520 521
area.  See also `pascal-comment-area'."
  (interactive)
  (save-excursion
    (let ((start (point))
	  (end (point)))
      ;; Find the boundaries of the comment
      (save-excursion
Richard M. Stallman's avatar
Richard M. Stallman committed
522
	(setq start (progn (search-backward pascal-exclude-str-start nil t)
Richard M. Stallman's avatar
Richard M. Stallman committed
523
			   (point)))
Richard M. Stallman's avatar
Richard M. Stallman committed
524
	(setq end (progn (search-forward pascal-exclude-str-end nil t)
Richard M. Stallman's avatar
Richard M. Stallman committed
525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549
			 (point))))
      ;; Check if we're really inside a comment
      (if (or (equal start (point)) (<= end (point)))
	  (message "Not standing within commented area.")
	(progn
	  ;; Remove endcomment
	  (goto-char end)
	  (beginning-of-line)
	  (let ((pos (point)))
	    (end-of-line)
	    (delete-region pos (1+ (point))))
	  ;; Change comments back to normal
	  (save-excursion
	    (while (re-search-backward "!{" start t)
	      (replace-match "}" t t)))
	  (save-excursion
	    (while (re-search-backward "!(\\*" start t)
	      (replace-match "*)" t t)))
	  ;; Remove startcomment
	  (goto-char start)
	  (beginning-of-line)
	  (let ((pos (point)))
	    (end-of-line)
	    (delete-region pos (1+ (point)))))))))

Richard M. Stallman's avatar
Richard M. Stallman committed
550 551
(defun pascal-beg-of-defun ()
  "Move backward to the beginning of the current function or procedure."
Richard M. Stallman's avatar
Richard M. Stallman committed
552
  (interactive)
Richard M. Stallman's avatar
Richard M. Stallman committed
553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581
  (catch 'found
    (if (not (looking-at (concat "\\s \\|\\s)\\|" pascal-defun-re)))
	(forward-sexp 1))
    (let ((nest 0) (max -1) (func 0)
	  (reg (concat pascal-beg-block-re "\\|" 
		       pascal-end-block-re "\\|"
		       pascal-defun-re)))
      (while (re-search-backward reg nil 'move)
	(cond ((let ((state (save-excursion
			      (parse-partial-sexp (point-min) (point)))))
		 (or (nth 3 state) (nth 4 state))) ; Inside string or comment
	       ())
	      ((match-end 1)                       ; begin|case|record|repeat
	       (if (and (looking-at "\\<record\\>") (>= max 0))
		   (setq func (1- func)))
	       (setq nest (1+ nest)
		     max (max nest max)))
	      ((match-end 2)                       ; end|until
	       (if (and (= nest max) (>= max 0))
		   (setq func (1+ func)))
	       (setq nest (1- nest)))
	      ((match-end 3)                       ; function|procedure
	       (if (= 0 func)
		   (throw 'found t)
		 (setq func (1- func)))))))
    nil))

(defun pascal-end-of-defun ()
  "Move forward to the end of the current function or procedure."
Richard M. Stallman's avatar
Richard M. Stallman committed
582
  (interactive)
Richard M. Stallman's avatar
Richard M. Stallman committed
583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610
  (if (looking-at "\\s ")
      (forward-sexp 1))
  (if (not (looking-at pascal-defun-re))
      (pascal-beg-of-defun))
  (forward-char 1)
  (let ((nest 0) (func 1)
	(reg (concat pascal-beg-block-re "\\|" 
		     pascal-end-block-re "\\|"
		     pascal-defun-re)))
    (while (and (/= func 0)
		(re-search-forward reg nil 'move))
      (cond ((let ((state (save-excursion
			      (parse-partial-sexp (point-min) (point)))))
		 (or (nth 3 state) (nth 4 state))) ; Inside string or comment
	       ())
	    ((match-end 1)
	     (setq nest (1+ nest))
	     (if (save-excursion
		   (goto-char (match-beginning 0))
		   (looking-at "\\<record\\>"))
		 (setq func (1+ func))))
	    ((match-end 2)
	     (setq nest (1- nest))
	     (if (= nest 0)
		 (setq func (1- func))))
	    ((match-end 3)
	     (setq func (1+ func))))))
  (forward-line 1))
Richard M. Stallman's avatar
Richard M. Stallman committed
611

612 613 614
(defun pascal-end-of-statement ()
  "Move forward to end of current statement."
  (interactive)
615 616
  (let ((parse-sexp-ignore-comments t)
	(nest 0) pos
617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649
	(regexp (concat "\\(" pascal-beg-block-re "\\)\\|\\("
			pascal-end-block-re "\\)")))
    (if (not (looking-at "[ \t\n]")) (forward-sexp -1))
    (or (looking-at pascal-beg-block-re)
	;; Skip to end of statement
	(setq pos (catch 'found
		    (while t
		      (forward-sexp 1)
		      (cond ((looking-at "[ \t]*;")
			     (skip-chars-forward "^;")
			     (forward-char 1)
			     (throw 'found (point)))
			    ((save-excursion
			       (forward-sexp -1)
			       (looking-at pascal-beg-block-re))
			     (goto-char (match-beginning 0))
			     (throw 'found nil))
			    ((eobp)
			     (throw 'found (point))))))))
    (if (not pos)
	;; Skip a whole block
	(catch 'found
	  (while t
	    (re-search-forward regexp nil 'move)
	    (setq nest (if (match-end 1) 
			   (1+ nest)
			 (1- nest)))
	    (cond ((eobp)
		   (throw 'found (point)))
		  ((= 0 nest)
		   (throw 'found (pascal-end-of-statement))))))
      pos)))

Richard M. Stallman's avatar
Richard M. Stallman committed
650
(defun pascal-downcase-keywords ()
Richard M. Stallman's avatar
Richard M. Stallman committed
651
  "Downcase all Pascal keywords in the buffer."
Richard M. Stallman's avatar
Richard M. Stallman committed
652 653 654 655
  (interactive)
  (pascal-change-keywords 'downcase-word))

(defun pascal-upcase-keywords ()
Richard M. Stallman's avatar
Richard M. Stallman committed
656
  "Upcase all Pascal keywords in the buffer."
Richard M. Stallman's avatar
Richard M. Stallman committed
657 658 659 660
  (interactive)
  (pascal-change-keywords 'upcase-word))

(defun pascal-capitalize-keywords ()
Richard M. Stallman's avatar
Richard M. Stallman committed
661
  "Capitalize all Pascal keywords in the buffer."
Richard M. Stallman's avatar
Richard M. Stallman committed
662 663 664
  (interactive)
  (pascal-change-keywords 'capitalize-word))

Richard M. Stallman's avatar
Richard M. Stallman committed
665
;; Change the keywords according to argument.
Richard M. Stallman's avatar
Richard M. Stallman committed
666 667
(defun pascal-change-keywords (change-word)
  (save-excursion
Richard M. Stallman's avatar
Richard M. Stallman committed
668 669 670 671 672 673 674 675
    (let ((keyword-re (concat "\\<\\("
			      (mapconcat 'identity pascal-keywords "\\|")
			      "\\)\\>")))
      (goto-char (point-min))
      (while (re-search-forward keyword-re nil t)
	(funcall change-word -1)))))


Richard M. Stallman's avatar
Richard M. Stallman committed
676 677 678 679 680

;;;
;;; Other functions
;;;
(defun pascal-set-auto-comments ()
Richard M. Stallman's avatar
Richard M. Stallman committed
681 682 683 684
  "Insert `{ case }' or `{ NAME }' on this line if appropriate.
Insert `{ case }' if there is an `end' on the line which
ends a case block.  Insert `{ NAME }' if there is an `end'
on the line which ends a function or procedure named NAME."
Richard M. Stallman's avatar
Richard M. Stallman committed
685 686 687
  (save-excursion
    (forward-line -1)
    (skip-chars-forward " \t")
Richard M. Stallman's avatar
Richard M. Stallman committed
688
    (if (and (looking-at "\\<end;")
Richard M. Stallman's avatar
Richard M. Stallman committed
689 690
	     (not (save-excursion
		    (end-of-line)
Richard M. Stallman's avatar
Richard M. Stallman committed
691
		    (search-backward "{" (pascal-get-beg-of-line) t))))
692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726
	(let ((type (car (pascal-calculate-indent))))
	  (if (eq type 'declaration)
	      ()
	    (if (eq type 'case)
		;; This is a case block
		(progn
		  (end-of-line)
		  (delete-horizontal-space)
		  (insert " { case }"))
	      (let ((nest 1))
		;; Check if this is the end of a function
		(save-excursion
		  (while (not (or (looking-at pascal-defun-re) (bobp)))
		    (backward-sexp 1)
		    (cond ((looking-at pascal-beg-block-re)
			   (setq nest (1- nest)))
			  ((looking-at pascal-end-block-re)
			   (setq nest (1+ nest)))))
		  (if (bobp)
		      (setq nest 1)))
		(if (zerop nest)
		    (progn
		      (end-of-line)
		      (delete-horizontal-space)
		      (insert " { ")
		      (let (b e)
			(save-excursion
			  (setq b (progn (pascal-beg-of-defun)
					 (skip-chars-forward "^ \t")
					 (skip-chars-forward " \t")
					 (point))
				e (progn (skip-chars-forward "a-zA-Z0-9_")
					 (point))))
			(insert-buffer-substring (current-buffer) b e))
		      (insert " }"))))))))))
Richard M. Stallman's avatar
Richard M. Stallman committed
727

Richard M. Stallman's avatar
Richard M. Stallman committed
728 729


Richard M. Stallman's avatar
Richard M. Stallman committed
730
;;;
Richard M. Stallman's avatar
Richard M. Stallman committed
731 732 733 734 735
;;; Indentation
;;;
(defconst pascal-indent-alist
  '((block . (+ ind pascal-indent-level))
    (case . (+ ind pascal-case-indent))
736
    (caseblock . ind) (cpp . 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
737 738 739 740 741 742
    (declaration . (+ ind pascal-indent-level))
    (paramlist . (pascal-indent-paramlist t))
    (comment . (pascal-indent-comment t))
    (defun . ind) (contexp . ind)
    (unknown . 0) (string . 0)))

Richard M. Stallman's avatar
Richard M. Stallman committed
743
(defun pascal-indent-command ()
Richard M. Stallman's avatar
Richard M. Stallman committed
744 745 746 747
  "Indent for special part of code."
  (let* ((indent-str (pascal-calculate-indent))
	 (type (car indent-str))
	 (ind (car (cdr indent-str))))
748 749 750
    (cond ((and (eq type 'paramlist)
		(or (memq 'all pascal-auto-lineup)
		    (memq 'paramlist pascal-auto-lineup)))
Richard M. Stallman's avatar
Richard M. Stallman committed
751 752
	   (pascal-indent-paramlist)
	   (pascal-indent-paramlist))
753 754 755
	  ((and (eq type 'declaration)
		(or (memq 'all pascal-auto-lineup)
		    (memq 'declaration  pascal-auto-lineup)))
Richard M. Stallman's avatar
Richard M. Stallman committed
756
	   (pascal-indent-declaration))
757 758 759
	  ((and (eq type 'case) (not (looking-at "^[ \t]*$"))
		(or (memq 'all pascal-auto-lineup)
		    (memq 'case pascal-auto-lineup)))
Richard M. Stallman's avatar
Richard M. Stallman committed
760 761 762
	   (pascal-indent-case)))
    (if (looking-at "[ \t]+$")
	(skip-chars-forward " \t"))))
Richard M. Stallman's avatar
Richard M. Stallman committed
763 764

(defun pascal-indent-line ()
Richard M. Stallman's avatar
Richard M. Stallman committed
765 766 767 768 769 770 771
  "Indent current line as a Pascal statement."
  (let* ((indent-str (pascal-calculate-indent))
	 (type (car indent-str))
	 (ind (car (cdr indent-str))))
    (if (looking-at "^[0-9a-zA-Z]+[ \t]*:[^=]")
	(search-forward ":" nil t))
    (delete-horizontal-space)
772
    ;; Some things should not be indented
Richard M. Stallman's avatar
Richard M. Stallman committed
773
    (if (or (and (eq type 'declaration) (looking-at pascal-declaration-re))
774
	    (eq type 'cpp)
Richard M. Stallman's avatar
Richard M. Stallman committed
775 776 777 778 779 780 781 782 783 784 785 786 787
	    (looking-at pascal-defun-re))
	()
      ;; Other things should have no extra indent
      (if (looking-at pascal-noindent-re)
	  (indent-to ind)
	;; But most lines are treated this way:
	(indent-to (eval (cdr (assoc type pascal-indent-alist))))
	))))

(defun pascal-calculate-indent ()
  "Calculate the indent of the current Pascal line.
Return a list of two elements: (INDENT-TYPE INDENT-LEVEL)."
  (save-excursion
788 789
    (let* ((parse-sexp-ignore-comments t)
	   (oldpos (point))
Richard M. Stallman's avatar
Richard M. Stallman committed
790
	   (state (save-excursion (parse-partial-sexp (point-min) (point))))
791
	   (nest 0) (par 0) (complete (looking-at "[ \t]*end\\>"))
792
	   (elsed (looking-at "[ \t]*else\\>"))
Richard M. Stallman's avatar
Richard M. Stallman committed
793 794 795 796 797 798
	   (type (catch 'nesting
		   ;; Check if inside a string, comment or parenthesis
		   (cond ((nth 3 state) (throw 'nesting 'string))
			 ((nth 4 state) (throw 'nesting 'comment))
			 ((> (car state) 0)
			  (goto-char (scan-lists (point) -1 (car state)))
799 800 801 802
			  (setq par (1+ (current-column))))
			 ((save-excursion (beginning-of-line)
					  (eq (following-char) ?#))
			  (throw 'nesting 'cpp)))
Richard M. Stallman's avatar
Richard M. Stallman committed
803 804 805
		   ;; Loop until correct indent is found
		   (while t
		     (backward-sexp 1)
806 807 808 809 810 811 812 813 814 815 816 817 818 819
		     (cond (;--Escape from case statements
			    (and (looking-at "[A-Za-z0-9]+[ \t]*:[^=]")
				 (not complete)
				 (save-excursion (skip-chars-backward " \t")
						 (bolp))
				 (= (save-excursion
				      (end-of-line) (backward-sexp) (point))
				    (point))
				 (> (save-excursion (goto-char oldpos)
						    (beginning-of-line)
						    (point))
				    (point)))
			    (throw 'nesting 'caseblock))
			   (;--Nest block outwards
Richard M. Stallman's avatar
Richard M. Stallman committed
820 821 822 823 824 825
			    (looking-at pascal-beg-block-re)
			    (if (= nest 0)
				(cond ((looking-at "case\\>")
				       (throw 'nesting 'case))
				      ((looking-at "record\\>")
				       (throw 'nesting 'declaration))
826
				      (t (throw 'nesting 'block)))
Richard M. Stallman's avatar
Richard M. Stallman committed
827 828 829
			      (setq nest (1- nest))))
			   (;--Nest block inwards
			    (looking-at pascal-end-block-re)
830 831 832
			    (if (and (looking-at "end\\s ")
				     elsed (not complete))
				(throw 'nesting 'block))
Richard M. Stallman's avatar
Richard M. Stallman committed
833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850
			    (setq complete t
				  nest (1+ nest)))
			   (;--Defun (or parameter list)
			    (looking-at pascal-defun-re)
			    (if (= 0 par)
				(throw 'nesting 'defun)
			      (setq par 0)
			      (let ((n 0))
				(while (re-search-forward
					"\\(\\<record\\>\\)\\|\\<end\\>"
					oldpos t)
				  (if (match-end 1)
				      (setq n (1+ n)) (setq n (1- n))))
				(if (> n 0)
				    (throw 'nesting 'declaration)
				  (throw 'nesting 'paramlist)))))
			   (;--Declaration part
			    (looking-at pascal-declaration-re)
851 852 853 854
			    (if (save-excursion
				  (goto-char oldpos)
				  (forward-line -1)
				  (looking-at "^[ \t]*$"))
Richard M. Stallman's avatar
Richard M. Stallman committed
855 856 857 858 859 860 861 862 863 864 865 866 867 868
				(throw 'nesting 'unknown)
			      (throw 'nesting 'declaration)))
			   (;--If, else or while statement
			    (and (not complete)
				 (looking-at pascal-sub-block-re))
			    (throw 'nesting 'block))
			   (;--Found complete statement
			    (save-excursion (forward-sexp 1)
					    (= (following-char) ?\;))
			    (setq complete t))
			   (;--No known statements
			    (bobp)
			    (throw 'nesting 'unknown))
			   )))))
869

Richard M. Stallman's avatar
Richard M. Stallman committed
870 871 872 873 874 875 876 877
      ;; Return type of block and indent level.
      (if (> par 0)                               ; Unclosed Parenthesis 
	  (list 'contexp par)
	(list type (pascal-indent-level))))))

(defun pascal-indent-level ()
  "Return the indent-level the current statement has.
Do not count labels, case-statements or records."
Richard M. Stallman's avatar
Richard M. Stallman committed
878 879
  (save-excursion
    (beginning-of-line)
Richard M. Stallman's avatar
Richard M. Stallman committed
880 881 882 883
    (if (looking-at "[ \t]*[0-9a-zA-Z]+[ \t]*:[^=]")
	(search-forward ":" nil t)
      (if (looking-at ".*=[ \t]*record\\>")
	  (search-forward "=" nil t)))
Richard M. Stallman's avatar
Richard M. Stallman committed
884 885 886
    (skip-chars-forward " \t")
    (current-column)))

Richard M. Stallman's avatar
Richard M. Stallman committed
887 888 889 890 891 892 893 894 895 896 897 898 899
(defun pascal-indent-comment (&optional arg)
  "Indent current line as comment.
If optional arg is non-nil, just return the
column number the line should be indented to."
    (let* ((stcol (save-excursion
		    (re-search-backward "(\\*\\|{" nil t)
		    (1+ (current-column)))))
      (if arg stcol
	(delete-horizontal-space)
	(indent-to stcol))))

(defun pascal-indent-case ()
  "Indent within case statements."
900 901
  (let ((savepos (point-marker))
	(end (prog2
902 903
		 (end-of-line)
		 (point-marker)
Richard M. Stallman's avatar
Richard M. Stallman committed
904
	       (re-search-backward "\\<case\\>" nil t)))
905
	(beg (point)) oldpos
Richard M. Stallman's avatar
Richard M. Stallman committed
906 907 908
	(ind 0))
    ;; Get right indent
    (while (< (point) (marker-position end))
909 910 911 912
      (if (re-search-forward 
	   "^[ \t]*[^ \t,:]+[ \t]*\\(,[ \t]*[^ \t,:]+[ \t]*\\)*:"
	   (marker-position end) 'move)
	  (forward-char -1))
913 914 915 916 917 918
      (if (< (point) (marker-position end))
	  (progn
	    (delete-horizontal-space)
	    (if (> (current-column) ind)
		(setq ind (current-column)))
	    (pascal-end-of-statement))))
Richard M. Stallman's avatar
Richard M. Stallman committed
919
    (goto-char beg)
920
    (setq oldpos (marker-position end))
Richard M. Stallman's avatar
Richard M. Stallman committed
921 922
    ;; Indent all case statements
    (while (< (point) (marker-position end))
923
      (if (re-search-forward
924
	   "^[ \t]*[^][ \t,\\.:]+[ \t]*\\(,[ \t]*[^ \t,:]+[ \t]*\\)*:"
925
	   (marker-position end) 'move)
Richard M. Stallman's avatar
Richard M. Stallman committed
926 927 928 929 930 931
	  (forward-char -1))
      (indent-to (1+ ind))
      (if (/= (following-char) ?:)
	  ()
	(forward-char 1)
	(delete-horizontal-space)
932 933 934
	(insert " "))
      (setq oldpos (point))
      (pascal-end-of-statement))
935
    (goto-char savepos)))
Richard M. Stallman's avatar
Richard M. Stallman committed
936 937 938 939 940

(defun pascal-indent-paramlist (&optional arg)
  "Indent current line in parameterlist.
If optional arg is non-nil, just return the
indent of the current line in parameterlist."
Richard M. Stallman's avatar
Richard M. Stallman committed
941
  (save-excursion
Richard M. Stallman's avatar
Richard M. Stallman committed
942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
    (let* ((oldpos (point))
	   (stpos (progn (goto-char (scan-lists (point) -1 1)) (point)))
	   (stcol (1+ (current-column)))
	   (edpos (progn (pascal-declaration-end) 
			 (search-backward ")" (pascal-get-beg-of-line) t)
			 (point)))
	   (usevar (re-search-backward "\\<var\\>" stpos t)))
      (if arg (progn
		;; If arg, just return indent
		(goto-char oldpos)
		(beginning-of-line)
		(if (or (not usevar) (looking-at "[ \t]*var\\>"))
		    stcol (+ 4 stcol)))
	(goto-char stpos)
	(forward-char 1)
	(delete-horizontal-space)
	(if (and usevar (not (looking-at "var\\>")))
	    (indent-to (+ 4 stcol)))
	(pascal-indent-declaration nil stpos edpos)))))

(defun pascal-indent-declaration (&optional arg start end)
  "Indent current lines as declaration, lining up the `:'s or `='s."
  (let ((pos (point-marker)))
    (if (and (not (or arg start)) (not (pascal-declaration-beg)))
	()
      (let ((lineup (if (or (looking-at "\\<var\\>\\|\\<record\\>") arg start) 
			":" "="))
	    (stpos (if start start
		       (forward-word 2) (backward-word 1) (point)))
	    (edpos (set-marker (make-marker)
			       (if end end
				 (max (progn (pascal-declaration-end)
					     (point))
				      pos))))
	    ind)

	(goto-char stpos)
	;; Indent lines in record block
	(if arg
	    (while (<= (point) (marker-position edpos))
	      (beginning-of-line)
	      (delete-horizontal-space)
	      (if (looking-at "end\\>")
		  (indent-to arg)
		(indent-to (+ arg pascal-indent-level)))
	      (forward-line 1)))

	;; Do lineup
	(setq ind (pascal-get-lineup-indent stpos edpos lineup))
	(goto-char stpos)
	(while (<= (point) (marker-position edpos))
	  (if (search-forward lineup (pascal-get-end-of-line) 'move)
	      (forward-char -1))
	  (delete-horizontal-space)
	  (indent-to ind)
	  (if (not (looking-at lineup))
	      (forward-line 1) ; No more indent if there is no : or =
	    (forward-char 1)
	    (delete-horizontal-space)
	    (insert " ")
	    ;; Indent record block
	    (if (looking-at "record\\>")
		(pascal-indent-declaration (current-column)))
	    (forward-line 1)))))

    ;; If arg - move point
    (if arg (forward-line -1)
      (goto-char (marker-position pos)))))

;  "Return the indent level that will line up several lines within the region
;from b to e nicely. The lineup string is str."
(defun pascal-get-lineup-indent (b e str)
  (save-excursion
    (let ((ind 0)
	  (reg (concat str "\\|\\(\\<record\\>\\)"))
	  nest)
      (goto-char b)
      ;; Get rightmost position
      (while (< (point) e)
	(setq nest 1)
	(if (re-search-forward reg (min e (pascal-get-end-of-line 2)) 'move)
1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
	    (progn
	      ;; Skip record blocks
	      (if (match-beginning 1)
		  (pascal-declaration-end)
		(progn
		  (goto-char (match-beginning 0))
		  (skip-chars-backward " \t")
		  (if (> (current-column) ind)
		      (setq ind (current-column)))
		  (goto-char (match-end 0)))))))
Richard M. Stallman's avatar
Richard M. Stallman committed
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046
      ;; In case no lineup was found
      (if (> ind 0)
	  (1+ ind)
	;; No lineup-string found
	(goto-char b)
	(end-of-line)
	(skip-chars-backward " \t")
	(1+ (current-column))))))
    


;;;
;;; Completion
;;;
1047 1048 1049 1050 1051 1052
(defvar pascal-str nil)
(defvar pascal-all nil)
(defvar pascal-pred nil)
(defvar pascal-buffer-to-use nil)
(defvar pascal-flag nil)

Richard M. Stallman's avatar
Richard M. Stallman committed
1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
(defun pascal-string-diff (str1 str2)
  "Return index of first letter where STR1 and STR2 differs."
  (catch 'done
    (let ((diff 0))
      (while t
	(if (or (> (1+ diff) (length str1))
		(> (1+ diff) (length str2)))
	    (throw 'done diff))
	(or (equal (aref str1 diff) (aref str2 diff))
	    (throw 'done diff))
	(setq diff (1+ diff))))))

;; Calculate all possible completions for functions if argument is `function',
;; completions for procedures if argument is `procedure' or both functions and
;; procedures otherwise.

(defun pascal-func-completion (type)
  ;; Build regular expression for function/procedure names
1071 1072 1073 1074 1075 1076 1077
  (if (string= pascal-str "")
      (setq pascal-str "[a-zA-Z_]"))
  (let ((pascal-str (concat (cond
			     ((eq type 'procedure) "\\<\\(procedure\\)\\s +")
			     ((eq type 'function) "\\<\\(function\\)\\s +")
			     (t "\\<\\(function\\|procedure\\)\\s +"))
			    "\\<\\(" pascal-str "[a-zA-Z0-9_.]*\\)\\>"))
Richard M. Stallman's avatar
Richard M. Stallman committed
1078
	match)
1079
    
Richard M. Stallman's avatar
Richard M. Stallman committed
1080 1081 1082 1083 1084 1085
    (if (not (looking-at "\\<\\(function\\|procedure\\)\\>"))
	(re-search-backward "\\<\\(function\\|procedure\\)\\>" nil t))
    (forward-char 1)

    ;; Search through all reachable functions
    (while (pascal-beg-of-defun)
1086
      (if (re-search-forward pascal-str (pascal-get-end-of-line) t)
Richard M. Stallman's avatar
Richard M. Stallman committed
1087 1088
	  (progn (setq match (buffer-substring (match-beginning 2)
					       (match-end 2)))
1089 1090 1091
		 (if (or (null pascal-pred)
			 (funcall pascal-pred match))
		     (setq pascal-all (cons match pascal-all)))))
Richard M. Stallman's avatar
Richard M. Stallman committed
1092 1093 1094 1095
      (goto-char (match-beginning 0)))))

(defun pascal-get-completion-decl ()
  ;; Macro for searching through current declaration (var, type or const)
1096
  ;; for matches of `str' and adding the occurrence tp `all'
Richard M. Stallman's avatar
Richard M. Stallman committed
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109
  (let ((end (save-excursion (pascal-declaration-end)
			     (point)))
	match)
    ;; Traverse lines
    (while (< (point) end)
      (if (re-search-forward "[:=]" (pascal-get-end-of-line) t)
	  ;; Traverse current line
	  (while (and (re-search-backward 
		       (concat "\\((\\|\\<\\(var\\|type\\|const\\)\\>\\)\\|" 
			       pascal-symbol-re)
		       (pascal-get-beg-of-line) t)
		      (not (match-end 1)))
	    (setq match (buffer-substring (match-beginning 0) (match-end 0)))
1110 1111 1112 1113
	    (if (string-match (concat "\\<" pascal-str) match)
		(if (or (null pascal-pred)
			(funcall pascal-pred match))
		    (setq pascal-all (cons match pascal-all))))))
Richard M. Stallman's avatar
Richard M. Stallman committed
1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
      (if (re-search-forward "\\<record\\>" (pascal-get-end-of-line) t)
	  (pascal-declaration-end)
	(forward-line 1)))))

(defun pascal-type-completion ()
  "Calculate all possible completions for types."
  (let ((start (point))
	goon)
    ;; Search for all reachable type declarations
    (while (or (pascal-beg-of-defun)
	       (setq goon (not goon)))
      (save-excursion
	(if (and (< start (prog1 (save-excursion (pascal-end-of-defun)
						 (point))
			    (forward-char 1)))
		 (re-search-forward
1130
		  "\\<type\\>\\|\\<\\(begin\\|function\\|procedure\\)\\>"
Richard M. Stallman's avatar
Richard M. Stallman committed
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
		  start t)
		 (not (match-end 1)))
	    ;; Check current type declaration
	    (pascal-get-completion-decl))))))

(defun pascal-var-completion ()
  "Calculate all possible completions for variables (or constants)."
  (let ((start (point))
	goon twice)
    ;; Search for all reachable var declarations
    (while (or (pascal-beg-of-defun)
	       (setq goon (not goon)))
      (save-excursion
	(if (> start (prog1 (save-excursion (pascal-end-of-defun)
					    (point))))
1146
	    () ; Declarations not reachable
Richard M. Stallman's avatar
Richard M. Stallman committed
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
	  (if (search-forward "(" (pascal-get-end-of-line) t)
	      ;; Check parameterlist
		(pascal-get-completion-decl))
	  (setq twice 2)
	  (while (>= (setq twice (1- twice)) 0)
	    (cond ((and (re-search-forward
			 (concat "\\<\\(var\\|const\\)\\>\\|"
				 "\\<\\(begin\\|function\\|procedure\\)\\>")
			 start t)
			(not (match-end 2)))
		   ;; Check var/const declarations
		   (pascal-get-completion-decl))
		  ((match-end 2)
		   (setq twice 0)))))))))


(defun pascal-keyword-completion (keyword-list)
  "Give list of all possible completions of keywords in KEYWORD-LIST."
  (mapcar '(lambda (s) 
1166 1167 1168 1169
	     (if (string-match (concat "\\<" pascal-str) s)
		 (if (or (null pascal-pred)
			 (funcall pascal-pred s))
		     (setq pascal-all (cons s pascal-all)))))
Richard M. Stallman's avatar
Richard M. Stallman committed
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180
	  keyword-list))

;; Function passed to completing-read, try-completion or
;; all-completions to get completion on STR. If predicate is non-nil,
;; it must be a function to be called for every match to check if this
;; should really be a match. If flag is t, the function returns a list
;; of all possible completions. If it is nil it returns a string, the
;; longest possible completion, or t if STR is an exact match. If flag
;; is 'lambda, the function returns t if STR is an exact match, nil
;; otherwise.

1181
(defun pascal-completion (pascal-str pascal-pred pascal-flag)
Richard M. Stallman's avatar
Richard M. Stallman committed
1182
  (save-excursion
1183
    (let ((pascal-all nil))
Richard M. Stallman's avatar
Richard M. Stallman committed
1184
      ;; Set buffer to use for searching labels. This should be set
1185
      ;; within functions which use pascal-completions
1186
      (set-buffer pascal-buffer-to-use)
Richard M. Stallman's avatar
Richard M. Stallman committed
1187 1188 1189 1190 1191 1192 1193

      ;; Determine what should be completed
      (let ((state (car (pascal-calculate-indent))))
	(cond (;--Within a declaration or parameterlist
	       (or (eq state 'declaration) (eq state 'paramlist)
		   (and (eq state 'defun)
			(save-excursion
1194 1195
			  (re-search-backward ")[ \t]*:"
					      (pascal-get-beg-of-line) t))))
Richard M. Stallman's avatar
Richard M. Stallman committed
1196 1197 1198 1199 1200
	       (if (or (eq state 'paramlist) (eq state 'defun))
		   (pascal-beg-of-defun))
	       (pascal-type-completion)
	       (pascal-keyword-completion pascal-type-keywords))
	      (;--Starting a new statement
1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211
	       (and (not (eq state 'contexp))
		    (save-excursion
		      (skip-chars-backward "a-zA-Z0-9_.")
		      (backward-sexp 1)
		      (or (looking-at pascal-nosemi-re)
			  (progn
			    (forward-sexp 1)
			    (looking-at "\\s *\\(;\\|:[^=]\\)")))))
	       (save-excursion (pascal-var-completion))
	       (pascal-func-completion 'procedure)
	       (pascal-keyword-completion pascal-start-keywords))
Richard M. Stallman's avatar
Richard M. Stallman committed
1212 1213 1214
	      (t;--Anywhere else
	       (save-excursion (pascal-var-completion))
	       (pascal-func-completion 'function)
1215
	       (pascal-keyword-completion pascal-separator-keywords))))
1216
      
Richard M. Stallman's avatar
Richard M. Stallman committed
1217 1218 1219 1220
      ;; Now we have built a list of all matches. Give response to caller
      (pascal-completion-response))))

(defun pascal-completion-response ()
1221
  (cond ((or (equal pascal-flag 'lambda) (null pascal-flag))
Richard M. Stallman's avatar
Richard M. Stallman committed
1222
	 ;; This was not called by all-completions
1223
	 (if (null pascal-all)
Richard M. Stallman's avatar
Richard M. Stallman committed
1224 1225 1226
	     ;; Return nil if there was no matching label
	     nil
	   ;; Get longest string common in the labels
1227 1228
	   (let* ((elm (cdr pascal-all))
		  (match (car pascal-all))
Richard M. Stallman's avatar
Richard M. Stallman committed
1229 1230
		  (min (length match))
		  exact tmp)
1231
	     (if (string= match pascal-str)
Richard M. Stallman's avatar
Richard M. Stallman committed
1232 1233 1234 1235 1236 1237 1238 1239 1240
		 ;; Return t if first match was an exact match
		 (setq match t)
	       (while (not (null elm))
		 ;; Find longest common string
		 (if (< (setq tmp (pascal-string-diff match (car elm))) min)
		     (progn
		       (setq min tmp)
		       (setq match (substring match 0 min))))
		 ;; Terminate with match=t if this is an exact match