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;;; pascal.el  -  Major mode for editing pascal source in emacs.

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;;; Copyright (C) 1993, 1994 Free Software Foundation, Inc.
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;;; Author: Espen Skoglund (espensk@stud.cs.uit.no)
;;; Keywords: languages
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;;; This file is part of GNU Emacs.
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;;; This program is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 2 of the License, or
;;; (at your option) any later version.
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;;; This program is distributed in the hope that it will be useful,
;;; 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.
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;;; You should have received a copy of the GNU General Public License
;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:

;;; USAGE
;;; =====
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;;; 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
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;;; C-h m. You may also get online help describing various functions by:
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;;; C-h f <Name of function you want described>

;;; 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
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;;;       pascal-auto-lineup        '(all)
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;;;       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")
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;;;       pascal-separator-keywords '("downto" "else" "mod" "div" "then"))
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;;; KNOWN BUGS / BUGREPORTS
;;; =======================
;;; As far as I know, there are no bugs in the current version of this
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;;; 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.

;;; Code:
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(defconst pascal-mode-version "2.4"
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  "Version of `pascal.el'.")
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(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.")
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(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)
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  (define-key pascal-mode-map "#"        'electric-pascal-hash)
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  (define-key pascal-mode-map "\r"       'electric-pascal-terminate-line)
  (define-key pascal-mode-map "\t"       'electric-pascal-tab)
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  (define-key pascal-mode-map "\M-\t"    'pascal-complete-word)
  (define-key pascal-mode-map "\M-?"     'pascal-show-completions)
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  (define-key pascal-mode-map "\177"     'backward-delete-char-untabify)
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  (define-key pascal-mode-map "\M-\C-h"  'pascal-mark-defun)
  (define-key pascal-mode-map "\C-c\C-b" 'pascal-insert-block)
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  (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)
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  (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)
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;;; A command to change the whole buffer won't be used terribly
;;; often, so no need for a key binding.
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;  (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)
  )
  
(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\\)\\>")
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(defconst pascal-sub-block-re   "\\<\\(if\\|else\\|for\\|while\\|with\\)\\>")
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(defconst pascal-noindent-re    "\\<\\(begin\\|end\\|until\\|else\\)\\>")
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(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 -----/\\-----}")
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(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))
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  (modify-syntax-entry ?\\ "\\"  pascal-mode-syntax-table)
  (modify-syntax-entry ?( "()1"  pascal-mode-syntax-table)  
  (modify-syntax-entry ?) ")(4"  pascal-mode-syntax-table)
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  (modify-syntax-entry ?* ". 23" pascal-mode-syntax-table)
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  (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))

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(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.")

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(defvar pascal-indent-level 3
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  "*Indentation of Pascal statements with respect to containing block.")
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(defvar pascal-case-indent 2
  "*Indentation for case statements.")
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(defvar pascal-auto-newline nil
  "*Non-nil means automatically newline after simcolons and the punctation mark
after an end.")
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(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.")
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(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.")
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(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.")

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(defvar pascal-toggle-completions nil
  "*Non-nil means that \\<pascal-mode-map>\\[pascal-complete-label] should \
not display a completion buffer when
the label couldn't be completed, but instead toggle the possible completions
with repeated \\[pascal-complete-label]'s.")
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(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.")
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(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.")
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(defvar pascal-separator-keywords
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  '("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)))
	    ((match-beginning 2) (setq nest (1- nest)))))))

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(defun pascal-declaration-beg ()
  (let ((nest 1))
    (while (and (> nest 0)
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		(re-search-backward "[:=]\\|\\<\\(type\\|var\\|label\\|const\\)\\>\\|\\(\\<record\\>\\)\\|\\(\\<end\\>\\)" (pascal-get-beg-of-line 0) t))
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      (cond ((match-beginning 1) (setq nest 0))
	    ((match-beginning 2) (setq nest (1- nest)))
	    ((match-beginning 3) (setq nest (1+ nest)))))
    (= nest 0)))
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(defsubst pascal-within-string ()
  (save-excursion
    (nth 3 (parse-partial-sexp (pascal-get-beg-of-line) (point)))))

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;;;###autoload
(defun pascal-mode ()
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  "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)
    Non-nil means automatically newline after simcolons and the punctation mark
    after an end.
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 pascal-tab-always-indent (default t)
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    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.
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 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.
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 pascal-auto-lineup       (default t)
    List of contexts where auto lineup of :'s or ='s hould be done.
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See also the user variables pascal-type-keywords, pascal-start-keywords and
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pascal-separator-keywords.
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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)
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  (setq comment-indent-function 'pascal-indent-comment)
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  (make-local-variable 'parse-sexp-ignore-comments)
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  (setq parse-sexp-ignore-comments nil)
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  (make-local-variable 'case-fold-search)
  (setq case-fold-search t)
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  (make-local-variable 'comment-start-skip)
  (setq comment-start-skip "(\\*+ *\\|{ *")
  (make-local-variable 'comment-end)
  (setq comment-end "}")
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  (make-local-variable 'font-lock-defaults)
  (setq font-lock-defaults '(pascal-font-lock-keywords nil t))
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  (run-hooks 'pascal-mode-hook))

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;;;
;;;  Electric functions
;;;
(defun electric-pascal-terminate-line ()
  "Terminate line and indent next line."
  (interactive)
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  ;; First, check if current line should be indented
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  (save-excursion
    (beginning-of-line)
    (skip-chars-forward " \t")
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    (if (looking-at pascal-autoindent-lines-re)
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	(pascal-indent-line)))
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  (delete-horizontal-space) ; Removes trailing whitespaces
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  (newline)
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  ;; Indent next line
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  (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")
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      (cond ((looking-at "\\*[ \t]+)")
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	     ;; Delete region between `*' and `)' if there is only whitespaces.
	     (forward-char 1)
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	     (delete-horizontal-space))
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	    ((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.
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    (if (null setstar)	
	(pascal-indent-line)
      (insert "*  "))))
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(defun electric-pascal-semi-or-dot ()
  "Insert `;' or `.' character and reindent the line."
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  (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 ()
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  "Insert `:' and do all indentions except line indent on this line."
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  (interactive)
  (insert last-command-char)
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  ;; 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))))

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(defun electric-pascal-equal ()
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  "Insert `=', and do indention if within type declaration."
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  (interactive)
  (insert last-command-char)
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  (if (eq (car (pascal-calculate-indent)) 'declaration)
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      (let ((pascal-tab-always-indent nil))
	(pascal-indent-command))))

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

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(defun electric-pascal-tab ()
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  "Function called when TAB is pressed in Pascal mode."
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  (interactive)
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  ;; 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) ?#))))
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      (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))
      (insert "\t"))
    (pascal-indent-command)))


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;;;
;;; Interactive functions
;;;
(defun pascal-insert-block ()
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  "Insert Pascal begin ... end; block in the code with right indentation."
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  (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 ()
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  "Insert Pascal star comment at point."
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  (interactive)
  (pascal-indent-line)
  (insert "(*")
  (electric-pascal-terminate-line)
  (save-excursion
    (electric-pascal-terminate-line)
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    (delete-horizontal-space)
    (insert ")"))
  (insert "  "))
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(defun pascal-mark-defun ()
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  "Mark the current pascal function (or procedure).
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This puts the mark at the end, and point at the beginning."
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  (interactive)
  (push-mark (point))
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  (pascal-end-of-defun)
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  (push-mark (point))
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  (pascal-beg-of-defun)
  (if (fboundp 'zmacs-activate-region)
      (zmacs-activate-region)))
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(defun pascal-comment-area (start end)
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  "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."
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  (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))
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    (insert pascal-exclude-str-end)
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    (setq end (point))
    (newline)
    (goto-char start)
    (beginning-of-line)
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    (insert pascal-exclude-str-start)
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    (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 ()
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  "Uncomment a commented area; change deformed comments back to normal.
This command does nothing if the pointer is not in a commented
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area.  See also `pascal-comment-area'."
  (interactive)
  (save-excursion
    (let ((start (point))
	  (end (point)))
      ;; Find the boundaries of the comment
      (save-excursion
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	(setq start (progn (search-backward pascal-exclude-str-start nil t)
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			   (point)))
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	(setq end (progn (search-forward pascal-exclude-str-end nil t)
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			 (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)))))))))

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(defun pascal-beg-of-defun ()
  "Move backward to the beginning of the current function or procedure."
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  (interactive)
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  (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."
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  (interactive)
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  (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))
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(defun pascal-end-of-statement ()
  "Move forward to end of current statement."
  (interactive)
  (let ((nest 0) pos
	(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)))

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(defun pascal-downcase-keywords ()
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  "Downcase all Pascal keywords in the buffer."
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  (interactive)
  (pascal-change-keywords 'downcase-word))

(defun pascal-upcase-keywords ()
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  "Upcase all Pascal keywords in the buffer."
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  (interactive)
  (pascal-change-keywords 'upcase-word))

(defun pascal-capitalize-keywords ()
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  "Capitalize all Pascal keywords in the buffer."
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  (interactive)
  (pascal-change-keywords 'capitalize-word))

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;; Change the keywords according to argument.
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(defun pascal-change-keywords (change-word)
  (save-excursion
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    (let ((keyword-re (concat "\\<\\("
			      (mapconcat 'identity pascal-keywords "\\|")
			      "\\)\\>")))
      (goto-char (point-min))
      (while (re-search-forward keyword-re nil t)
	(funcall change-word -1)))))


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;;;
;;; Other functions
;;;
(defun pascal-set-auto-comments ()
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  "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."
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  (save-excursion
    (forward-line -1)
    (skip-chars-forward " \t")
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    (if (and (looking-at "\\<end;")
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	     (not (save-excursion
		    (end-of-line)
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		    (search-backward "{" (pascal-get-beg-of-line) t))))
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	(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 " }"))))))))))
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;;;
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;;; Indentation
;;;
(defconst pascal-indent-alist
  '((block . (+ ind pascal-indent-level))
    (case . (+ ind pascal-case-indent))
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    (caseblock . ind) (cpp . 0)
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    (declaration . (+ ind pascal-indent-level))
    (paramlist . (pascal-indent-paramlist t))
    (comment . (pascal-indent-comment t))
    (defun . ind) (contexp . ind)
    (unknown . 0) (string . 0)))

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(defun pascal-indent-command ()
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  "Indent for special part of code."
  (let* ((indent-str (pascal-calculate-indent))
	 (type (car indent-str))
	 (ind (car (cdr indent-str))))
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    (cond ((and (eq type 'paramlist)
		(or (memq 'all pascal-auto-lineup)
		    (memq 'paramlist pascal-auto-lineup)))
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	   (pascal-indent-paramlist)
	   (pascal-indent-paramlist))
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	  ((and (eq type 'declaration)
		(or (memq 'all pascal-auto-lineup)
		    (memq 'declaration  pascal-auto-lineup)))
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	   (pascal-indent-declaration))
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	  ((and (eq type 'case) (not (looking-at "^[ \t]*$"))
		(or (memq 'all pascal-auto-lineup)
		    (memq 'case pascal-auto-lineup)))
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	   (pascal-indent-case)))
    (if (looking-at "[ \t]+$")
	(skip-chars-forward " \t"))))
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(defun pascal-indent-line ()
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  "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)
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    ;; Some things should not be indented
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    (if (or (and (eq type 'declaration) (looking-at pascal-declaration-re))
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	    (eq type 'cpp)
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	    (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
    (let* ((oldpos (point))
	   (state (save-excursion (parse-partial-sexp (point-min) (point))))
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	   (nest 0) (par 0) (complete (looking-at "[ \t]*end\\>"))
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	   (elsed (looking-at "[ \t]*else\\>"))
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	   (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)))
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			  (setq par (1+ (current-column))))
			 ((save-excursion (beginning-of-line)
					  (eq (following-char) ?#))
			  (throw 'nesting 'cpp)))
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		   ;; Loop until correct indent is found
		   (while t
		     (backward-sexp 1)
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		     (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
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			    (looking-at pascal-beg-block-re)
			    (if (= nest 0)
				(cond ((looking-at "case\\>")
				       (throw 'nesting 'case))
				      ((looking-at "record\\>")
				       (throw 'nesting 'declaration))
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				      (t (throw 'nesting 'block)))
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			      (setq nest (1- nest))))
			   (;--Nest block inwards
			    (looking-at pascal-end-block-re)
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			    (if (and (looking-at "end\\s ")
				     elsed (not complete))
				(throw 'nesting 'block))
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			    (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)
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			    (if (save-excursion
				  (goto-char oldpos)
				  (forward-line -1)
				  (looking-at "^[ \t]*$"))
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				(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))
			   )))))
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      ;; 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."
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  (save-excursion
    (beginning-of-line)
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    (if (looking-at "[ \t]*[0-9a-zA-Z]+[ \t]*:[^=]")
	(search-forward ":" nil t)
      (if (looking-at ".*=[ \t]*record\\>")
	  (search-forward "=" nil t)))
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    (skip-chars-forward " \t")
    (current-column)))

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(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."
  (skip-chars-forward ": \t")
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  (let ((end (prog2
		 (end-of-line)
		 (point-marker)
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	       (re-search-backward "\\<case\\>" nil t)))
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	(beg (point)) oldpos
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	(ind 0))
    ;; Get right indent
    (while (< (point) (marker-position end))
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      (if (re-search-forward 
	   "^[ \t]*[^ \t,:]+[ \t]*\\(,[ \t]*[^ \t,:]+[ \t]*\\)*:"
	   (marker-position end) 'move)
	  (forward-char -1))
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      (delete-horizontal-space)
      (if (> (current-column) ind)
	  (setq ind (current-column)))
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      (pascal-end-of-statement))
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    (goto-char beg)
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    (setq oldpos (marker-position end))
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    ;; Indent all case statements
    (while (< (point) (marker-position end))
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      (if (re-search-forward
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	   "^[ \t]*[^][ \t,\\.:]+[ \t]*\\(,[ \t]*[^ \t,:]+[ \t]*\\)*:"
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	   (marker-position end) 'move)
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	  (forward-char -1))
      (indent-to (1+ ind))
      (if (/= (following-char) ?:)
	  ()
	(forward-char 1)
	(delete-horizontal-space)
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	(insert " "))
      (setq oldpos (point))
      (pascal-end-of-statement))
    (goto-char oldpos)))
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(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."
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  (save-excursion
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    (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)
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	    (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)))))))
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      ;; 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
;;;
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(defvar pascal-str nil)
(defvar pascal-all nil)
(defvar pascal-pred nil)
(defvar pascal-buffer-to-use nil)
(defvar pascal-flag nil)

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(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
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  (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_.]*\\)\\>"))
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	match)
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    (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)
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      (if (re-search-forward pascal-str (pascal-get-end-of-line) t)
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	  (progn (setq match (buffer-substring (match-beginning 2)
					       (match-end 2)))
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		 (if (or (null pascal-pred)
			 (funcall pascal-pred match))
		     (setq pascal-all (cons match pascal-all)))))
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      (goto-char (match-beginning 0)))))

(defun pascal-get-completion-decl ()
  ;; Macro for searching through current declaration (var, type or const)
  ;; for matches of `str' and adding the occurence tp `all'
  (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)))
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	    (if (string-match (concat "\\<" pascal-str) match)
		(if (or (null pascal-pred)
			(funcall pascal-pred match))
		    (setq pascal-all (cons match pascal-all))))))
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      (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
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		  "\\<type\\>\\|\\<\\(begin\\|function\\|procedure\\)\\>"
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		  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))))
	    () ; Declarations not reacable
	  (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) 
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	     (if (string-match (concat "\\<" pascal-str) s)
		 (if (or (null pascal-pred)
			 (funcall pascal-pred s))
		     (setq pascal-all (cons s pascal-all)))))
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	  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.

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(defun pascal-completion (pascal-str pascal-pred pascal-flag)
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  (save-excursion
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    (let ((pascal-all nil))
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      ;; Set buffer to use for searching labels. This should be set
      ;; within functins which use pascal-completions
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      (set-buffer pascal-buffer-to-use)
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      ;; 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
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			  (re-search-backward ")[ \t]*:"
					      (pascal-get-beg-of-line) t))))
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	       (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
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	       (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))
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	      (t;--Anywhere else
	       (save-excursion (pascal-var-completion))
	       (pascal-func-completion 'function)
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	       (pascal-keyword-completion pascal-separator-keywords))))
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      ;; Now we have built a list of all matches. Give response to caller
      (pascal-completion-response))))

(defun pascal-completion-response ()
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  (cond ((or (equal pascal-flag 'lambda) (null pascal-flag))
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	 ;; This was not called by all-completions
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	 (if (null pascal-all)
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	     ;; Return nil if there was no matching label
	     nil
	   ;; Get longest string common in the labels
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	   (let* ((elm (cdr pascal-all))
		  (match (car pascal-all))
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		  (min (length match))
		  exact tmp)
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	     (if (string= match pascal-str)
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		 ;; 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
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		 (if (string= (car elm) pascal-str)
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		     (progn
		       (setq match t)
		       (setq elm nil))
		   (setq elm (cdr elm)))))
	     ;; If this is a test just for exact match, return nil ot t
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	     (if (and (equal pascal-flag 'lambda) (not (equal match 't)))
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		 nil
	       match))))
	;; If flag is t, this was called by all-completions. Return
	;; list of all possible completions
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	(pascal-flag
	 pascal-all)))
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(defvar pascal-last-word-numb 0)
(defvar pascal-last-word-shown nil)
(defvar pascal-last-completions nil)

(defun pascal-complete-word ()
  "Complete word at current point.
\(See also `pascal-toggle-completions', `pascal-type-keywords',
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`pascal-start-keywords' and `pascal-separator-keywords'.)"
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  (interactive)
  (let* ((b (save-excursion (skip-chars-backward "a-zA-Z0-9_") (point)))
	 (e (save-excursion (skip-chars-forward "a-zA-Z0-9_") (point)))
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	 (pascal-str (buffer-substring b e))
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	 ;; The following variable is used in pascal-completion
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	 (pascal-buffer-to-use (current-buffer))
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	 (allcomp (if (and pascal-toggle-completions
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			   (string= pascal-last-word-shown pascal-str))
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		      pascal-last-completions
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		    (all-completions pascal-str 'pascal-completion)))
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	 (match (if pascal-toggle-completions
		    "" (try-completion
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			pascal-str (mapcar '(lambda (elm)
					      (cons elm 0)) allcomp)))))
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    ;; Delete old string
    (delete-region b e)

    ;; Toggle-completions inserts whole labels
    (if pascal-toggle-completions
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	(progn