;;; ada-stmt.el --- an extension to Ada mode for inserting statement templates

;; Copyright (C) 1987, 1993-1994, 1996-2018 Free Software Foundation,
;; Inc.

;; Authors: Daniel Pfeiffer
;;	Markus Heritsch
;;	Rolf Ebert <ebert@waporo.muc.de>
;; Maintainer: Stephen Leake <stephen_leake@stephe-leake.org>
;; Keywords: languages, ada
;; Package: ada-mode

;; This file is part of GNU Emacs.

;; GNU Emacs 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 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs 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.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:
;; This file is now automatically loaded from ada-mode.el, and creates a submenu
;; in Ada/ on the menu bar.

;;; History:

;; Created May 1987.
;; Original version from V. Bowman as in ada.el of Emacs-18
;; (borrowed heavily from Mick Jordan's Modula-2 package for GNU,
;; as modified by Peter Robinson, Michael Schmidt, and Tom Perrine.)
;;
;; Sep 1993. Daniel Pfeiffer <pfeiffer@cict.fr> (DP)
;; Introduced statement.el for smaller code and user configurability.
;;
;; Nov 1993. Rolf Ebert <ebert@enpc.fr> (RE) Moved the
;; skeleton generation into this separate file. The code still is
;; essentially written by DP
;;
;; Adapted Jun 1994. Markus Heritsch
;; <Markus.Heritsch@studbox.uni-stuttgart.de> (MH)
;; added menu bar support for templates
;;
;; 1994/12/02  Christian Egli <cegli@hcsd.hac.com>
;; General cleanup and bug fixes.
;;
;; 1995/12/20  John Hutchison <hutchiso@epi.syr.ge.com>
;; made it work with skeleton.el from Emacs-19.30. Several
;; enhancements and bug fixes.

;; BUGS:
;;;> I have the following suggestions for the function template: 1) I
;;;> don't want it automatically assigning it a name for the return variable. I
;;;> never want it to be called "Result" because that is nondescript. If you
;;;> must define a variable, give me the ability to specify its name.
;;;>
;;;> 2) You do not provide a type for variable 'Result'. Its type is the same
;;;> as the function's return type, which the template knows, so why force me
;;;> to type it in?
;;;>

;;;It would be nice if one could configure such layout details separately
;;;without patching the LISP code. Maybe the metalanguage used in ada-stmt.el
;;;could be taken even further, providing the user with some nice syntax
;;;for describing layout. Then my own hacks would survive the next
;;;update of the package :-)


;;; Code:

(require 'skeleton nil t)
(require 'easymenu)
(require 'ada-mode)

(defun ada-func-or-proc-name ()
  "Return the name of the current function or procedure."
  (save-excursion
    (let ((case-fold-search t))
      (if (re-search-backward ada-procedure-start-regexp nil t)
	  (match-string 5)
	"NAME?"))))

;;; ---- statement skeletons ------------------------------------------

(define-skeleton ada-array
  "Insert array type definition.
Prompt for component type and index subtypes."
  ()
  "array (" ("index definition: " str ", " ) -2 ") of " _ ?\;)


(define-skeleton ada-case
  "Build skeleton case statement.
Prompt for the selector expression.  Also builds the first when clause."
  "[selector expression]: "
  "case " str " is" \n
  > "when " ("discrete choice: " str " | ") -3 " =>" \n
  > _ \n
  < < "end case;")


(define-skeleton ada-when
  "Start a case statement alternative with a when clause."
  ()
  < "when " ("discrete choice: " str " | ") -3 " =>" \n
  >)


(define-skeleton ada-declare-block
  "Insert a block with a declare part.
Indent for the first declaration."
  "[block name]: "
  < str & ?: & \n
  > "declare" \n
  > _ \n
  < "begin" \n
  > \n
  < "end " str | -1 ?\;)


(define-skeleton ada-exception-block
  "Insert a block with an exception part.
Indent for the first line of code."
  "[block name]: "
  < str & ?: & \n
  > "begin" \n
  > _ \n
  < "exception" \n
  > \n
  < "end " str | -1 ?\;)


(define-skeleton ada-exception
  "Insert an indented exception part into a block."
  ()
  < "exception" \n
  >)


(define-skeleton ada-exit-1
  "Insert then exit condition of the exit statement, prompting for condition."
  "[exit condition]: "
  "when " str | -5)


(define-skeleton ada-exit
  "Insert an exit statement, prompting for loop name and condition."
  "[name of loop to exit]: "
  "exit " str & ?\ (ada-exit-1) | -1 ?\;)

;;;###autoload
(defun ada-header ()
  "Insert a descriptive header at the top of the file."
  (interactive "*")
  (save-excursion
    (goto-char (point-min))
    (if (fboundp 'make-header)
	(funcall (symbol-function 'make-header))
      (ada-header-tmpl))))


(define-skeleton ada-header-tmpl
  "Insert a comment block containing the module title, author, etc."
  "[Description]: "
  "--                              -*- Mode: Ada -*-"
  "\n" ada-fill-comment-prefix "Filename        : " (buffer-name)
  "\n" ada-fill-comment-prefix "Description     : " str
  "\n" ada-fill-comment-prefix "Author          : " (user-full-name)
  "\n" ada-fill-comment-prefix "Created On      : " (current-time-string)
  "\n" ada-fill-comment-prefix "Last Modified By: ."
  "\n" ada-fill-comment-prefix "Last Modified On: ."
  "\n" ada-fill-comment-prefix "Update Count    : 0"
  "\n" ada-fill-comment-prefix "Status          : Unknown, Use with caution!"
  "\n")


(define-skeleton ada-display-comment
  "Inserts three comment lines, making a display comment."
  ()
  "--\n" ada-fill-comment-prefix _ "\n--")


(define-skeleton ada-if
  "Insert skeleton if statement, prompting for a boolean-expression."
  "[condition]: "
  "if " str " then" \n
  > _ \n
  < "end if;")


(define-skeleton ada-elsif
  "Add an elsif clause to an if statement,
prompting for the boolean-expression."
  "[condition]: "
  < "elsif " str " then" \n
  >)


(define-skeleton ada-else
  "Add an else clause inside an if-then-end-if clause."
  ()
  < "else" \n
  >)


(define-skeleton ada-loop
  "Insert a skeleton loop statement.  The exit statement is added by hand."
  "[loop name]: "
  < str & ?: & \n
  > "loop" \n
  > _ \n
  < "end loop " str | -1 ?\;)


(define-skeleton ada-for-loop-prompt-variable
  "Prompt for the loop variable."
  "[loop variable]: "
  str)


(define-skeleton ada-for-loop-prompt-range
  "Prompt for the loop range."
  "[loop range]: "
  str)


(define-skeleton ada-for-loop
  "Build a skeleton for-loop statement, prompting for the loop parameters."
  "[loop name]: "
  < str & ?: & \n
  > "for "
  (ada-for-loop-prompt-variable)
  " in "
  (ada-for-loop-prompt-range)
  " loop" \n
  > _ \n
  < "end loop " str | -1 ?\;)


(define-skeleton ada-while-loop-prompt-entry-condition
  "Prompt for the loop entry condition."
  "[entry condition]: "
  str)


(define-skeleton ada-while-loop
  "Insert a skeleton while loop statement."
  "[loop name]: "
  < str & ?: & \n
  > "while "
  (ada-while-loop-prompt-entry-condition)
  " loop" \n
  > _ \n
  < "end loop " str | -1 ?\;)


(define-skeleton ada-package-spec
  "Insert a skeleton package specification."
  "[package name]: "
  "package " str  " is" \n
  > _ \n
  < "end " str ?\;)


(define-skeleton ada-package-body
  "Insert a skeleton package body -- includes a begin statement."
  "[package name]: "
  "package body " str " is" \n
  > _ \n
;  < "begin" \n
  < "end " str ?\;)


(define-skeleton ada-private
  "Undent and start a private section of a package spec.  Reindent."
  ()
  < "private" \n
  >)


(define-skeleton ada-function-spec-prompt-return
  "Prompts for function result type."
  "[result type]: "
  str)


(define-skeleton ada-function-spec
  "Insert a function specification.  Prompts for name and arguments."
  "[function name]: "
  "function " str
  " (" ("[parameter_specification]: " str "; " ) -2 ")"
  " return "
  (ada-function-spec-prompt-return)
  ";" \n )


(define-skeleton ada-procedure-spec
  "Insert a procedure specification, prompting for its name and arguments."
  "[procedure name]: "
  "procedure " str
  " (" ("[parameter_specification]: " str "; " ) -2 ")"
  ";" \n )


(define-skeleton ada-subprogram-body
  "Insert frame for subprogram body.
Invoke right after `ada-function-spec' or `ada-procedure-spec'."
  ()
  ;; Remove `;' from subprogram decl
  (save-excursion
    (let ((pos (1+ (point))))
      (ada-search-ignore-string-comment ada-subprog-start-re t nil)
      (when (ada-search-ignore-string-comment "(" nil pos t 'search-forward)
	(backward-char 1)
	(forward-sexp 1)))
    (if (looking-at ";")
	(delete-char 1)))
  " is" \n
   _ \n
   < "begin" \n
   \n
   < "exception" \n
   "when others => null;" \n
   < < "end "
  (ada-func-or-proc-name)
  ";" \n)


(define-skeleton ada-separate
  "Finish a body stub with `separate'."
  ()
  > "separate;" \n
  <)


;(define-skeleton ada-with
;  "Inserts a with clause, prompting for the list of units depended upon."
;  "[list of units depended upon]: "
;  "with " str ?\;)

;(define-skeleton ada-use
;  "Inserts a use clause, prompting for the list of packages used."
;  "[list of packages used]: "
;  "use " str ?\;)


(define-skeleton ada-record
  "Insert a skeleton record type declaration."
  ()
  "record" \n
  > _ \n
  < "end record;")


(define-skeleton ada-subtype
  "Start insertion of a subtype declaration, prompting for the subtype name."
  "[subtype name]: "
  "subtype " str " is " _ ?\;
  (not (message "insert subtype indication.")))


(define-skeleton ada-type
  "Start insertion of a type declaration, prompting for the type name."
  "[type name]: "
  "type " str ?\(
  ("[discriminant specs]: " str " ")
  | (backward-delete-char 1) | ?\)
  " is "
  (not (message "insert type definition.")))


(define-skeleton ada-task-body
  "Insert a task body, prompting for the task name."
  "[task name]: "
  "task body " str " is\n"
  "begin\n"
  > _ \n
  < "end " str ";" )


(define-skeleton ada-task-spec
  "Insert a task specification, prompting for the task name."
  "[task name]: "
  "task " str
  " (" ("[discriminant]: " str "; ") ") is\n"
  > "entry " _ \n
  <"end " str ";" )


(define-skeleton ada-get-param1
  "Prompt for arguments and if any enclose them in brackets."
  ()
  ("[parameter_specification]: " str "; " ) & -2 & ")")


(define-skeleton ada-get-param
  "Prompt for arguments and if any enclose them in brackets."
  ()
  " ("
  (ada-get-param1) | -2)


(define-skeleton ada-entry
  "Insert a task entry, prompting for the entry name."
  "[entry name]: "
  "entry " str
  (ada-get-param)
  ";" \n)


(define-skeleton ada-entry-family-prompt-discriminant
  "Insert an entry specification, prompting for the entry name."
  "[discriminant name]: "
  str)


(define-skeleton ada-entry-family
  "Insert an entry specification, prompting for the entry name."
  "[entry name]: "
  "entry " str
  " (" (ada-entry-family-prompt-discriminant) ")"
  (ada-get-param)
  ";" \n)


(define-skeleton ada-select
  "Insert a select block."
  ()
  "select\n"
  > _ \n
  < "end select;")


(define-skeleton ada-accept-1
  "Insert a condition statement, prompting for the condition name."
  "[condition]: "
  "when " str | -5 )


(define-skeleton ada-accept-2
  "Insert an accept statement, prompting for the name and arguments."
  "[accept name]: "
  > "accept " str
  (ada-get-param)
  " do" \n
  > _ \n
  < "end " str ";" )


(define-skeleton ada-accept
  "Insert an accept statement (prompt for condition, name and arguments)."
  ()
  > (ada-accept-1) & " =>\n"
  (ada-accept-2))


(define-skeleton ada-or-accept
  "Insert an accept alternative, prompting for the condition name."
  ()
  < "or\n"
  (ada-accept))


(define-skeleton ada-or-delay
  "Insert a delay alternative, prompting for the delay value."
  "[delay value]: "
  < "or\n"
  > "delay " str ";")


(define-skeleton ada-or-terminate
  "Insert a terminate alternative."
  ()
  < "or\n"
  > "terminate;")


(provide 'ada-stmt)

;;; ada-stmt.el ends here
