#! /usr/bin/scm \ %0 %1 %2 %3 %4 %5 %6 %7 %8 %9
- !#
;; Copyright (C) 1991-1999 Free Software Foundation, Inc.
;;
;; 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, or (at your option)
;; any later version.
;;
;; 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.
;;
;; You should have received a copy of the GNU General Public License
;; along with this software; see the file COPYING.  If not, write to
;; the Free Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111, USA.
;;
;; As a special exception, the Free Software Foundation gives permission
;; for additional uses of the text contained in its release of GUILE.
;;
;; The exception is that, if you link the GUILE library with other files
;; to produce an executable, this does not by itself cause the
;; resulting executable to be covered by the GNU General Public License.
;; Your use of that executable is in no way restricted on account of
;; linking the GUILE library code into it.
;;
;; This exception does not however invalidate any other reasons why
;; the executable file might be covered by the GNU General Public License.
;;
;; This exception applies only to the code released by the
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;; code from other Free Software Foundation releases into a copy of
;; GUILE, as the General Public License permits, the exception does
;; not apply to the code that you add in this way.  To avoid misleading
;; anyone as to the status of such modified files, you must delete
;; this exception notice from them.
;;
;; If you write modifications of your own for GUILE, it is your choice
;; whether to permit this exception to apply to your modifications.
;; If you do not wish that, delete this exception notice.

;;;; "xgen.scm", Convert C Event structs to xevent.h and xevent.scm.
;;; Author: Aubrey Jaffer.

(define (go-script)
  (cond ((not *script*))
	((>= 1 (- (length *argv*) *optind*))
	 (apply xgen.scm (list-tail *argv* *optind*)))
	(else
	 (display "\
\
Usage: xgen.scm /usr/include/X11/Xlib.h
\
  Creates xevent.h and xevent.scm, from the `typedef struct's
  in /usr/include/X11/xlib.h.
"
		  (current-error-port))
	 (exit #f))))

(require 'common-list-functions)
(require 'string-search)
(require 'line-i/o)
(require 'printf)
(require 'scanf)

(define (StudlyCaps->dashed-name nstr)
  (do ((idx (+ -1 (string-length nstr)) (+ -1 idx)))
      ((> 2 idx))
    (cond ((and (char-upper-case? (string-ref nstr (+ -1 idx)))
		(char-lower-case? (string-ref nstr idx)))
	   (set! nstr
		 (string-append (substring nstr 0 (+ -1 idx))
				"-"
				(substring nstr (+ -1 idx)
					   (string-length nstr)))))
	  ((and (char-lower-case? (string-ref nstr (+ -1 idx)))
		(char-upper-case? (string-ref nstr idx)))
	   (set! nstr
		 (string-append (substring nstr 0 idx)
				"-"
				(substring nstr idx
					   (string-length nstr)))))))
  nstr)

;; SCHEMEIFY-NAME:
;; * Changes _ to -
;; * Changes the first - to : if it is within the first 3 characters.
;; * inserts dashes between `StudlyCaps'

(define (schemeify-name pre name)
  (define nstr (string-subst name "_" "-"))
  (let ((sid (string-index nstr #\-)))
    (cond ((and pre sid (< sid 3)) (string-set! nstr sid #\:)
	   nstr)
	  (pre (string-append pre (StudlyCaps->dashed-name nstr)))
	  (else (StudlyCaps->dashed-name nstr)))))

(define (extract-structs port)
  (define typedef-struct (string-append (string #\newline) "typedef struct {"))
  (define structs '())
  (do ((find? (find-string-from-port? typedef-struct port)
	      (find-string-from-port? typedef-struct port)))
      ((not find?) (reverse structs))
    (set! structs (cons (extract-struct port) structs))))

(define (extract-struct port)
  (define elts '())
  (do ((typ (read-token port) (read-token port)))
      ((or (eof-object? typ) (eq? #\} typ))
       (let ((name (read-token port)))
	 (let ((chr (read-token port)))
	   (cond ((eqv? #\; chr))
		 (else (slib:error 'expected #\; 'but-read chr)))
	   (cons name (reverse elts)))))
    (letrec ((loop
	      (lambda (name)
		;;(print 'typ= typ 'name= name)
		(case name
		  ((#\*)
		   (case (string->symbol typ)
		     ((char) (set! typ "string"))
		     (else (set! typ (string-append typ "*"))))
		   (loop (read-token port)))
		  (else
		   (let loop2 ((chr (read-token port)))
		     (case chr
		       ((#\;)
			(set! elts (cons (list typ name) elts)))
		       ((#\,)
			(set! elts (cons (list typ name) elts))
			(loop (read-token port)))
		       ((#\[)
			(find-string-from-port? "]" port)
			(case (string->symbol typ)
			  ((char) (set! typ "string"))
			  (else (set! typ (string-append typ "*"))))
			(loop2 (read-token port)))
		       (else (slib:error 'expected #\; 'read chr))))))
		)))
      (case (string->symbol typ)
	((unsigned)
	 (set! typ (read-token port))
	 (case (string->symbol typ)
	   ((long short char int) (set! typ "int")
	    (loop (read-token port)))
	   (else (loop typ))))
	((struct)
	 (set! typ (read-token port))
	 (loop (read-token port)))
	((union)
	 (find-string-from-port? close-brace-string port)
	 ;;(set! typ "union")
	 (loop (read-token port)))
	(else (loop (read-token port)))))))

(define close-brace-string (string #\}))

(define (read-token port)
  (let ((chr (peek-char port)))
    (cond ((eqv? chr #\newline)
	   (read-char port)
	   (do ((fchr (peek-char port) (peek-char port)))
	       ((not (eqv? #\# fchr)))
	     (read-char port)
	     (if (eq? 'if (read port))
		 (do ((fchr (peek-char port) (peek-char port)))
		     ((eqv? #\# fchr))
		   (read-line port)))
	     (read-line port))
	   (read-token port))
	  ((char-whitespace? chr)
	   (read-char port)
	   (read-token port))
	  ((eqv? #\/ chr)
	   (cond ((and (find-string-from-port? "/*" port)
		       (find-string-from-port? "*/" port
					       ;;(lambda (chr) (display chr) #f)
					       ))
		  ;;(newline)
		  (read-token port))
		 (else
		  (slib:error 'botched-comment (read-line port)))))
	  ((or (char-alphabetic? chr) (eqv? #\_ chr))
	   (car (scanf-read-list "%[a-zA-Z_0-9]" port)))
	  ;;((string-index "[]*" chr) (string->symbol (string chr)))
	  (else (read-char port)))))

(defconst Bool (string->symbol "Bool"))
(defconst Time (string->symbol "Time"))

(define event-map
  '(
    ("XMotionEvent"		"MotionNotify")
    ("XKeyEvent"		"KeyPress"	"KeyRelease")
    ("XButtonEvent"		"ButtonPress"	"ButtonRelease")
    ("XPointerMovedEvent"	"MotionNotify")
    ("XCrossingEvent"		"EnterNotify"	"LeaveNotify")
    ("XFocusChangeEvent"	"FocusIn"	"FocusOut")
    ("XKeymapEvent"		"KeymapNotify")
    ("XExposeEvent"		"Expose")
    ("XGraphicsExposeEvent"	"GraphicsExpose")
    ("XNoExposeEvent"		"NoExpose")
    ("XVisibilityEvent"		"VisibilityNotify")
    ("XCreateWindowEvent"	"CreateNotify")
    ("XDestroyWindowEvent"	"DestroyNotify")
    ("XUnmapEvent"		"UnmapNotify")
    ("XMapEvent"		"MapNotify")
    ("XMapRequestEvent"		"MapRequest")
    ("XReparentEvent"		"ReparentNotify")
    ("XConfigureEvent"		"ConfigureNotify")
    ("XConfigureRequestEvent"	"ConfigureRequest")
    ("XGravityEvent"		"GravityNotify")
    ("XResizeRequestEvent"	"ResizeRequest")
    ("XCirculateEvent"		"CirculateNotify")
    ("XCirculateRequestEvent"	"CirculateRequest")
    ("XPropertyEvent"		"PropertyNotify")
    ("XSelectionClearEvent"	"SelectionClear")
    ("XSelectionRequestEvent"	"SelectionRequest")
    ("XSelectionEvent"		"SelectionNotify")
    ("XColormapEvent"		"ColormapNotify")
    ("XClientMessageEvent"	"ClientMessage")
    ("XMappingEvent"		"MappingNotify")
    ))

(define event-fields '())
(define event-field-idx #x10)
(define (do-field xevent.scm fname)
  (define apr (assoc fname event-fields))
  (cond (apr (cdr apr))
	(else
	 (set! event-fields (acons fname event-field-idx event-fields))
	 (fprintf xevent.scm "(define X-event:%s #x%02x)\n"
		  (schemeify-name #f fname)
		  event-field-idx)
	 (set! event-field-idx (+ 1 event-field-idx))
	 (+ -1 event-field-idx))))

(define (xgen.scm . filename)
  (set! filename (if (null? filename) "/usr/include/X11/Xlib.h" (car filename)))
  (let ((structs (remove-if-not
		  (lambda (struct) (substring? "Event" (car struct)))
		  (call-with-input-file filename extract-structs))))
    (call-with-output-file "xevent.h"
      (lambda (xevent.h)
	(fprintf xevent.h "/* %s extracted typedef structs from %s */\n"
		 (car *argv*) filename)
	(fprintf xevent.h
		 "#ifdef SCM_EVENT_FIELDS\n")
	(call-with-output-file "xevent.scm"
	  (lambda (xevent.scm)
	    (define evs #f)
	    (fprintf xevent.scm ";; %s extracted typedef structs from %s\n"
		     (car *argv*) filename)
	    (for-each
	     (lambda (struct)
	       (define name (car struct))
	       (set! evs (assoc name event-map))
	       (and
		evs
		(for-each
		 (lambda (decl)
		   (define typ (string->symbol (car decl)))
		   (casev typ
		     ((,Bool ,Time int char)
		      (fprintf xevent.h "  ")
		      (for-each (lambda (event-name)
				  (fprintf xevent.h "case (%s<<8)+0x%02x: "
					   event-name
					   (do-field xevent.scm (cadr decl))))
				(cdr evs))
		      (fprintf xevent.h "return %s(((%s *) x)->%s);\n"
			       (casev typ
				 ((,Bool) "x_make_bool")
				 ((,Time) "ulong2num")
				 ((int char) "MAKINUM"))
			       name
			       (cadr decl)))
		     ;;(else (print 'typ typ))
		     ))
		 (cdr struct))))
	     structs)))
	(fprintf xevent.h "#else\n")
	(for-each (lambda (apr)
		    (for-each (lambda (evnt)
				(fprintf xevent.h
					 "  {%-20s \"%s\"},\n"
					 (string-append evnt ",") evnt))
			      (cdr apr)))
		  event-map)
	(fprintf xevent.h "#endif\n")))))

(go-script)

;;; Local Variables:
;;; mode:scheme
;;; End: