* Re: The indentation of lisp in linear time
@ 2008-07-07 6:41 A Soare
0 siblings, 0 replies; only message in thread
From: A Soare @ 2008-07-07 6:41 UTC (permalink / raw)
To: Emacs Dev [emacs-devel]
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I try again.
This time you have nothing to do... just to load this library and the new indentation will be installed.
I mean just the indentation for a line and for a region.
Maybe with this code I will be able to communicate with somebody from here.
Thanks in advance,
Alin Soare.
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[-- Attachment #2: indent.el --]
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(defun lisp-indent-value ()
"
VERSION : NEW
"
(cond ((elt state 3)
;; Inside a string, don't change indentation.
nil
)
((null (cadr state))
;; outside an expression align to the left column
0
)
((null indent)
;; an empty parethesis
(1+ start-col))
((and (integerp lisp-indent-offset)
(integerp (cadr indent)))
;; indent by constant offset
(+ (cadr indent) lisp-indent-offset)
)
((looking-at "\\s<\\s<\\s<")
;; Comments that start with three semicolons or more, should
;; start at the left margin
0
)
((eq (car indent) :l)
;; indent beneath a list
(caddr indent)
)
((and (eq (car indent) :w)
(stringp (cadr indent))
(>= (length (cadr indent)) 3)
(string-equal "def" (substring (cadr indent) 0 3)))
;; indent a def-form
(+ lisp-body-indent start-col)
)
((and (eq (car indent) :w)
(wholenump (get (intern-soft (cadr indent)) 'lisp-indent-function)))
;; here there is a special form
(setq oo (or (get (intern-soft (cadr indent)) 'lisp-indent-function)
(get (intern-soft (cadr indent)) 'lisp-indent-hook)))
(if (> (length indent) (* 3 oo))
(+ lisp-body-indent start-col)
(+ (* 2 lisp-body-indent) start-col))
)
((and (eq (car indent) :w)
(get (intern-soft (cadr indent)) 'lisp-indent-hook)
nil)
;; indent defined by another function
;; not defined yet
(funcall (get (intern-soft (cadr indent)) 'lisp-indent-hook))
)
((and (equal (following-char) ?:)
nil)
;; indent of a constant symbol
;; not yed defined
(caddr indent)
)
((and (eq (car indent) :w)
(> (length indent) 3))
;; indent beneath the `indent-what-argument' parameter
(elt indent (+ 3 (1- (* 3 indent-what-argument))))
)
(t
;; the first parameter of a function call
(caddr indent))
))
(defun lisp-indent-what-argument nil
(cond ((and (eq (car indent) :w)
(stringp (cadr indent))
(>= (length (cadr indent)) 3)
(string-equal "def" (substring (cadr indent) 0 3))
(= (length indent) 9))
;; if the second parameter of defun is a list, then this list
;; is not a function call
0)
((or
(and (>= (length indent) 6)
(eq (elt indent (- (length indent ) 6)) :q))
(and (eq (car indent) :w)
(stringp (cadr indent))
(string-equal "quote" (cadr indent))))
;; a quoted list is not a function call
0
)
(t
;; for the rest, always indent beneath the first parameter of
;; the function...
1)))
(defun lisp-indent-next-state (&optional n)
(setq steps (or n 1)
state (parse-partial-sexp (point) (+ steps (point)) () () state)
column (+ steps column)))
(defun lisp-indent-automaton (&optional indent-what-argument start-col indent)
"
an automaton to indent the lisp code
VERSION: NEW
"
(or indent-what-argument
(setq indent-what-argument 0))
(or state (and (beginning-of-defun)
(setq column (current-column))))
(and (null start-col) (setq start-col 0))
(catch 'STOP
(while (< (point) end)
(cond ((and (elt state 8)
(not (elt state 4)))
;; inside a string
(and (looking-at "\\s>")
(setq indent-lines (cons (lisp-indent-value) indent-lines)
column 0))
(lisp-indent-next-state)
)
((looking-at "\\s\"")
;; the start of a string
(setq indent (append indent (list :s () column)))
(lisp-indent-next-state)
)
((looking-at "\\s\(")
;; open a parenthesis
(let ((col (if indent-lines
(+ column (- (caar indent-lines) (cdar indent-lines)))
column)))
(setq indent (append indent (list :l () col)))
(lisp-indent-next-state)
(lisp-indent-automaton (lisp-indent-what-argument) col))
)
((looking-at "\\s\)")
;; close a parenthesis
(lisp-indent-next-state)
(throw 'STOP nil)
)
((looking-at "\\s ")
;; spaces are ignored
(while (looking-at "[[:blank:]]")
(lisp-indent-next-state))
)
((looking-at "\\sw\\|\\s_")
;; a function or a parameter
(let* ((col (if indent-lines
(+ column (- (caar indent-lines) (cdar indent-lines)))
column))
r
(w (catch 'WORD
(while t
(setq r (concat r (string (following-char))))
(lisp-indent-next-state)
(and (not (looking-at "\\w\\|\\s_"))
(throw 'WORD r))))))
(setq indent (append indent (list :w w col))))
)
((looking-at "\\s<")
;; start of a comment
(while (not (looking-at "\\s>"))
(lisp-indent-next-state))
)
((looking-at "\\s\'")
;; quote
(setq indent (append indent (list :q () column)))
(lisp-indent-next-state)
)
((looking-at "\\s\\")
;; a special character
(lisp-indent-next-state 2)
)
((looking-at "\\s>")
;; end of line
(lisp-indent-next-state)
(setq column 0)
(while (looking-at "\\s ")
(lisp-indent-next-state))
(setq indent-lines (cons (cons (lisp-indent-value) column) indent-lines))
)
(t
(error "oops! unknown class of syntax ! (indent failed at position %d)" (point)))))))
(defun indent-region (beg end)
"
An example how to use the automatonin for indentig a whole region
of lisp code in linear time (a function from the beginning to the point).
"
(let* (indent-lines
state
l)
(save-excursion
(goto-char beg)
(lisp-indent-automaton)
(let ((j indent-lines)
i)
(while (> (point) beg)
(setq i (car j))
(when (consp i)
(setq l (prog2 (beginning-of-line) (point)))
(skip-chars-forward "[[:blank:]]")
(when (not (zerop (- (- l (point)) (- (cdr i) (car i)))))
(delete-region l (point))
(indent-to (car i))))
(previous-line)
(setq j (cdr j)))))))
(defun indent-line nil
"
An example how to indent a line of code using the automaton
"
(let* (indent-lines
state
dif
(pos (point-marker))
(end (prog2 (beginning-of-line) (point))))
(or end (beginning-of-line) (setq end (point)))
(save-excursion (lisp-indent-automaton))
(if (not (consp (car indent-lines)))
nil
(setq dif
(or (catch 'DIF
(dolist (i (cdr indent-lines))
(and (consp i)
(throw 'DIF (- (cdr i) (car i))))))
0))
(skip-chars-forward "[[:blank:]]")
(when (not (zerop (- (+ (caar indent-lines) dif) (- (point) end))))
(delete-region end (point))
(indent-to (+ (caar indent-lines) dif))))
(goto-char (max pos (point)))))
(fset indent-line-function 'indent-line)
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