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authorUlrich Drepper <drepper@redhat.com>1997-04-18 00:57:04 +0000
committerUlrich Drepper <drepper@redhat.com>1997-04-18 00:57:04 +0000
commitf0a39e37f1bd7bcc8d6988345df5870d91c92cce (patch)
tree063fa517655b571179bcd74d8719409852b25477 /lisp/emacs-lisp/cl-indent.el
parent2b385e3555b76372ce8e19020673854a46a5ac63 (diff)
downloademacs-glibc-2_0_4.tar.gz
update from main archive 970417libc20x-970417glibc-2_0_4
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-;;; cl-indent.el --- enhanced lisp-indent mode
-
-;; Copyright (C) 1987 Free Software Foundation, Inc.
-
-;; Author: Richard Mlynarik <mly@eddie.mit.edu>
-;; Created: July 1987
-;; Maintainer: FSF
-;; Keywords: lisp, tools
-
-;; 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 2, 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; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
-
-;;; Commentary:
-
-;; This package supplies a single entry point, common-lisp-indent-function,
-;; which performs indentation in the preferred style for Common Lisp code.
-;; To enable it:
-;;
-;; (setq lisp-indent-function 'common-lisp-indent-function)
-
-;;>> TODO
-;; :foo
-;; bar
-;; :baz
-;; zap
-;; &key (like &body)??
-
-;; &rest 1 in lambda-lists doesn't work
-;; -- really want (foo bar
-;; baz)
-;; not (foo bar
-;; baz)
-;; Need something better than &rest for such cases
-
-;;; Code:
-
-(defvar lisp-indent-maximum-backtracking 3
- "*Maximum depth to backtrack out from a sublist for structured indentation.
-If this variable is 0, no backtracking will occur and forms such as flet
-may not be correctly indented.")
-
-(defvar lisp-tag-indentation 1
- "*Indentation of tags relative to containing list.
-This variable is used by the function `lisp-indent-tagbody'.")
-
-(defvar lisp-tag-body-indentation 3
- "*Indentation of non-tagged lines relative to containing list.
-This variable is used by the function `lisp-indent-tagbody' to indent normal
-lines (lines without tags).
-The indentation is relative to the indentation of the parenthesis enclosing
-the special form. If the value is t, the body of tags will be indented
-as a block at the same indentation as the first s-expression following
-the tag. In this case, any forms before the first tag are indented
-by `lisp-body-indent'.")
-
-
-;;;###autoload
-(defun common-lisp-indent-function (indent-point state)
- (let ((normal-indent (current-column)))
- ;; Walk up list levels until we see something
- ;; which does special things with subforms.
- (let ((depth 0)
- ;; Path describes the position of point in terms of
- ;; list-structure with respect to containing lists.
- ;; `foo' has a path of (0 4 1) in `((a b c (d foo) f) g)'
- (path ())
- ;; set non-nil when somebody works out the indentation to use
- calculated
- (last-point indent-point)
- ;; the position of the open-paren of the innermost containing list
- (containing-form-start (elt state 1))
- ;; the column of the above
- sexp-column)
- ;; Move to start of innermost containing list
- (goto-char containing-form-start)
- (setq sexp-column (current-column))
- ;; Look over successively less-deep containing forms
- (while (and (not calculated)
- (< depth lisp-indent-maximum-backtracking))
- (let ((containing-sexp (point)))
- (forward-char 1)
- (parse-partial-sexp (point) indent-point 1 t)
- ;; Move to the car of the relevant containing form
- (let (tem function method)
- (if (not (looking-at "\\sw\\|\\s_"))
- ;; This form doesn't seem to start with a symbol
- (setq function nil method nil)
- (setq tem (point))
- (forward-sexp 1)
- (setq function (downcase (buffer-substring tem (point))))
- (goto-char tem)
- (setq tem (intern-soft function)
- method (get tem 'common-lisp-indent-function))
- (cond ((and (null method)
- (string-match ":[^:]+" function))
- ;; The pleblisp package feature
- (setq function (substring function
- (1+ (match-beginning 0)))
- method (get (intern-soft function)
- 'common-lisp-indent-function)))
- ((and (null method))
- ;; backwards compatibility
- (setq method (get tem 'lisp-indent-function)))))
- (let ((n 0))
- ;; How far into the containing form is the current form?
- (if (< (point) indent-point)
- (while (condition-case ()
- (progn
- (forward-sexp 1)
- (if (>= (point) indent-point)
- nil
- (parse-partial-sexp (point)
- indent-point 1 t)
- (setq n (1+ n))
- t))
- (error nil))))
- (setq path (cons n path)))
-
- ;; backwards compatibility.
- (cond ((null function))
- ((null method)
- (if (null (cdr path))
- ;; (package prefix was stripped off above)
- (setq method (cond ((string-match "\\`def"
- function)
- '(4 (&whole 4 &rest 1) &body))
- ((string-match "\\`\\(with\\|do\\)-"
- function)
- '(4 &body))))))
- ;; backwards compatibility. Bletch.
- ((eq method 'defun)
- (setq method '(4 (&whole 4 &rest 1) &body))))
-
- (cond ((and (memq (char-after (1- containing-sexp)) '(?\' ?\`))
- (not (eql (char-after (- containing-sexp 2)) ?\#)))
- ;; No indentation for "'(...)" elements
- (setq calculated (1+ sexp-column)))
- ((or (eql (char-after (1- containing-sexp)) ?\,)
- (and (eql (char-after (1- containing-sexp)) ?\@)
- (eql (char-after (- containing-sexp 2)) ?\,)))
- ;; ",(...)" or ",@(...)"
- (setq calculated normal-indent))
- ((eql (char-after (1- containing-sexp)) ?\#)
- ;; "#(...)"
- (setq calculated (1+ sexp-column)))
- ((null method))
- ((integerp method)
- ;; convenient top-level hack.
- ;; (also compatible with lisp-indent-function)
- ;; The number specifies how many `distinguished'
- ;; forms there are before the body starts
- ;; Equivalent to (4 4 ... &body)
- (setq calculated (cond ((cdr path)
- normal-indent)
- ((<= (car path) method)
- ;; `distinguished' form
- (list (+ sexp-column 4)
- containing-form-start))
- ((= (car path) (1+ method))
- ;; first body form.
- (+ sexp-column lisp-body-indent))
- (t
- ;; other body form
- normal-indent))))
- ((symbolp method)
- (setq calculated (funcall method
- path state indent-point
- sexp-column normal-indent)))
- (t
- (setq calculated (lisp-indent-259
- method path state indent-point
- sexp-column normal-indent)))))
- (goto-char containing-sexp)
- (setq last-point containing-sexp)
- (if (not calculated)
- (condition-case ()
- (progn (backward-up-list 1)
- (setq depth (1+ depth)))
- (error (setq depth lisp-indent-maximum-backtracking))))))
- calculated)))
-
-
-(defun lisp-indent-report-bad-format (m)
- (error "%s has a badly-formed %s property: %s"
- ;; Love those free variable references!!
- function 'common-lisp-indent-function m))
-
-;; Blame the crufty control structure on dynamic scoping
-;; -- not on me!
-(defun lisp-indent-259 (method path state indent-point
- sexp-column normal-indent)
- (catch 'exit
- (let ((p path)
- (containing-form-start (elt state 1))
- n tem tail)
- ;; Isn't tail-recursion wonderful?
- (while p
- ;; This while loop is for destructuring.
- ;; p is set to (cdr p) each iteration.
- (if (not (consp method)) (lisp-indent-report-bad-format method))
- (setq n (1- (car p))
- p (cdr p)
- tail nil)
- (while n
- ;; This while loop is for advancing along a method
- ;; until the relevant (possibly &rest/&body) pattern
- ;; is reached.
- ;; n is set to (1- n) and method to (cdr method)
- ;; each iteration.
- (setq tem (car method))
-
- (or (eq tem 'nil) ;default indentation
-; (eq tem '&lambda) ;abbrev for (&whole 4 (&rest 1))
- (and (eq tem '&body) (null (cdr method)))
- (and (eq tem '&rest)
- (consp (cdr method)) (null (cdr (cdr method))))
- (integerp tem) ;explicit indentation specified
- (and (consp tem) ;destructuring
- (eq (car tem) '&whole)
- (or (symbolp (car (cdr tem)))
- (integerp (car (cdr tem)))))
- (and (symbolp tem) ;a function to call to do the work.
- (null (cdr method)))
- (lisp-indent-report-bad-format method))
-
- (cond ((and tail (not (consp tem)))
- ;; indent tail of &rest in same way as first elt of rest
- (throw 'exit normal-indent))
- ((eq tem '&body)
- ;; &body means (&rest <lisp-body-indent>)
- (throw 'exit
- (if (and (= n 0) ;first body form
- (null p)) ;not in subforms
- (+ sexp-column
- lisp-body-indent)
- normal-indent)))
- ((eq tem '&rest)
- ;; this pattern holds for all remaining forms
- (setq tail (> n 0)
- n 0
- method (cdr method)))
- ((> n 0)
- ;; try next element of pattern
- (setq n (1- n)
- method (cdr method))
- (if (< n 0)
- ;; Too few elements in pattern.
- (throw 'exit normal-indent)))
- ((eq tem 'nil)
- (throw 'exit (list normal-indent containing-form-start)))
-; ((eq tem '&lambda)
-; ;; abbrev for (&whole 4 &rest 1)
-; (throw 'exit
-; (cond ((null p)
-; (list (+ sexp-column 4) containing-form-start))
-; ((null (cdr p))
-; (+ sexp-column 1))
-; (t normal-indent))))
- ((integerp tem)
- (throw 'exit
- (if (null p) ;not in subforms
- (list (+ sexp-column tem) containing-form-start)
- normal-indent)))
- ((symbolp tem) ;a function to call
- (throw 'exit
- (funcall tem path state indent-point
- sexp-column normal-indent)))
- (t
- ;; must be a destructing frob
- (if (not (null p))
- ;; descend
- (setq method (cdr (cdr tem))
- n nil)
- (setq tem (car (cdr tem)))
- (throw 'exit
- (cond (tail
- normal-indent)
- ((eq tem 'nil)
- (list normal-indent
- containing-form-start))
- ((integerp tem)
- (list (+ sexp-column tem)
- containing-form-start))
- (t
- (funcall tem path state indent-point
- sexp-column normal-indent))))))))))))
-
-(defun lisp-indent-tagbody (path state indent-point sexp-column normal-indent)
- (if (not (null (cdr path)))
- normal-indent
- (save-excursion
- (goto-char indent-point)
- (beginning-of-line)
- (skip-chars-forward " \t")
- (list (cond ((looking-at "\\sw\\|\\s_")
- ;; a tagbody tag
- (+ sexp-column lisp-tag-indentation))
- ((integerp lisp-tag-body-indentation)
- (+ sexp-column lisp-tag-body-indentation))
- ((eq lisp-tag-body-indentation 't)
- (condition-case ()
- (progn (backward-sexp 1) (current-column))
- (error (1+ sexp-column))))
- (t (+ sexp-column lisp-body-indent)))
-; (cond ((integerp lisp-tag-body-indentation)
-; (+ sexp-column lisp-tag-body-indentation))
-; ((eq lisp-tag-body-indentation 't)
-; normal-indent)
-; (t
-; (+ sexp-column lisp-body-indent)))
- (elt state 1)
- ))))
-
-(defun lisp-indent-do (path state indent-point sexp-column normal-indent)
- (if (>= (car path) 3)
- (let ((lisp-tag-body-indentation lisp-body-indent))
- (funcall (function lisp-indent-tagbody)
- path state indent-point sexp-column normal-indent))
- (funcall (function lisp-indent-259)
- '((&whole nil &rest
- ;; the following causes weird indentation
- ;;(&whole 1 1 2 nil)
- )
- (&whole nil &rest 1))
- path state indent-point sexp-column normal-indent)))
-
-(defun lisp-indent-function-lambda-hack (path state indent-point
- sexp-column normal-indent)
- ;; indent (function (lambda () <newline> <body-forms>)) kludgily.
- (if (or (cdr path) ; wtf?
- (> (car path) 3))
- ;; line up under previous body form
- normal-indent
- ;; line up under function rather than under lambda in order to
- ;; conserve horizontal space. (Which is what #' is for.)
- (condition-case ()
- (save-excursion
- (backward-up-list 2)
- (forward-char 1)
- (if (looking-at "\\(lisp:+\\)?function\\(\\Sw\\|\\S_\\)")
- (+ lisp-body-indent -1 (current-column))
- (+ sexp-column lisp-body-indent)))
- (error (+ sexp-column lisp-body-indent)))))
-
-
-(let ((l '((block 1)
- (catch 1)
- (case (4 &rest (&whole 2 &rest 1)))
- (ccase . case) (ecase . case)
- (typecase . case) (etypecase . case) (ctypecase . case)
- (catch 1)
- (cond (&rest (&whole 2 &rest 1)))
- (block 1)
- (defvar (4 2 2))
- (defconstant . defvar) (defparameter . defvar)
- (define-modify-macro
- (4 &body))
- (define-setf-method
- (4 (&whole 4 &rest 1) &body))
- (defsetf (4 (&whole 4 &rest 1) 4 &body))
- (defun (4 (&whole 4 &rest 1) &body))
- (defmacro . defun) (deftype . defun)
- (defstruct ((&whole 4 &rest (&whole 2 &rest 1))
- &rest (&whole 2 &rest 1)))
- (destructuring-bind
- ((&whole 6 &rest 1) 4 &body))
- (do lisp-indent-do)
- (do* . do)
- (dolist ((&whole 4 2 1) &body))
- (dotimes . dolist)
- (eval-when 1)
- (flet ((&whole 4 &rest (&whole 1 (&whole 4 &rest 1) &body))
- &body))
- (labels . flet)
- (macrolet . flet)
- ;; `else-body' style
- (if (nil nil &body))
- ;; single-else style (then and else equally indented)
- (if (&rest nil))
- ;(lambda ((&whole 4 &rest 1) &body))
- (lambda ((&whole 4 &rest 1)
- &rest lisp-indent-function-lambda-hack))
- (let ((&whole 4 &rest (&whole 1 1 2)) &body))
- (let* . let)
- (compiler-let . let) ;barf
- (locally 1)
- ;(loop ...)
- (multiple-value-bind
- ((&whole 6 &rest 1) 4 &body))
- (multiple-value-call
- (4 &body))
- (multiple-value-list 1)
- (multiple-value-prog1 1)
- (multiple-value-setq
- (4 2))
- ;; Combines the worst features of BLOCK, LET and TAGBODY
- (prog ((&whole 4 &rest 1) &rest lisp-indent-tagbody))
- (prog* . prog)
- (prog1 1)
- (prog2 2)
- (progn 0)
- (progv (4 4 &body))
- (return 0)
- (return-from (nil &body))
- (tagbody lisp-indent-tagbody)
- (throw 1)
- (unless 1)
- (unwind-protect
- (5 &body))
- (when 1))))
- (while l
- (put (car (car l)) 'common-lisp-indent-function
- (if (symbolp (cdr (car l)))
- (get (cdr (car l)) 'common-lisp-indent-function)
- (car (cdr (car l)))))
- (setq l (cdr l))))
-
-
-;(defun foo (x)
-; (tagbody
-; foo
-; (bar)
-; baz
-; (when (losing)
-; (with-big-loser
-; (yow)
-; ((lambda ()
-; foo)
-; big)))
-; (flet ((foo (bar baz zap)
-; (zip))
-; (zot ()
-; quux))
-; (do ()
-; ((lose)
-; (foo 1))
-; (quux)
-; foo
-; (lose))
-; (cond ((x)
-; (win 1 2
-; (foo)))
-; (t
-; (lose
-; 3))))))
-
-
-;(put 'while 'common-lisp-indent-function 1)
-;(put 'defwrapper'common-lisp-indent-function ...)
-;(put 'def 'common-lisp-indent-function ...)
-;(put 'defflavor 'common-lisp-indent-function ...)
-;(put 'defsubst 'common-lisp-indent-function ...)
-
-;(put 'with-restart 'common-lisp-indent-function '((1 4 ((* 1))) (2 &body)))
-;(put 'restart-case 'common-lisp-indent-function '((1 4) (* 2 ((0 1) (* 1)))))
-;(put 'define-condition 'common-lisp-indent-function '((1 6) (2 6 ((* 1))) (3 4 ((* 1))) (4 &body)))
-;(put 'with-condition-handler 'common-lisp-indent-function '((1 4 ((* 1))) (2 &body)))
-;(put 'condition-case 'common-lisp-indent-function '((1 4) (* 2 ((0 1) (1 3) (2 &body)))))
-
-;;; cl-indent.el ends here