xemacs-beta: lisp/edebug/cl-read.el-19.15-b1 comparison

comparison lisp/edebug/cl-read.el-19.15-b1 @ 4:b82b59fe008d r19-15b3

Import from CVS: tag r19-15b3

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date	Mon, 13 Aug 2007 08:46:56 +0200
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+:b82b59fe008d
+;; Customizable, Common Lisp like reader for Emacs Lisp.
+;;
+;; Copyright (C) 1993 by Guido Bosch <Guido.Bosch@loria.fr>
+;; This file is written in GNU Emacs Lisp, but not (yet) part of GNU Emacs.
+;; The software contained in this file 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, 675 Mass Ave, Cambridge, MA 02139, USA.
+;;
+;; Please send bugs and comments to the author.
+;;
+;; <DISCLAIMER>
+;; This program is still under development.  Neither the author nor
+;; his employer accepts responsibility to anyone for the consequences of
+;; using it or for whether it serves any particular purpose or works
+;; at all.
+;; Introduction
+;; ------------
+;;
+;; This package replaces the standard Emacs Lisp reader (implemented
+;; as a set of built-in Lisp function in C) by a flexible and
+;; customizable Common Lisp like one (implemented entirely in Emacs
+;; Lisp). During reading of Emacs Lisp source files, it is about 40%
+;; slower than the built-in reader, but there is no difference in
+;; loading byte compiled files - they dont contain any syntactic sugar
+;; and are loaded with the built in subroutine `load'.
+;;
+;; The user level functions for defining read tables, character and
+;; dispatch macros are implemented according to the Commom Lisp
+;; specification by Steel's (2nd edition), but the read macro functions
+;; themselves are implemented in a slightly different way, because the
+;; basic character reading is done in an Emacs buffer, and not by
+;; using the primitive functions `read-char' and `unread-char', as real
+;; CL does.  To get 100% compatibility with CL, the above functions
+;; (or their equivalents) must be implemented as subroutines.
+;;
+;; Another difference with real CL reading is that basic tokens (symbols
+;; numbers, strings, and a few more) are still read by the original
+;; built-in reader. This is necessary to get reasonable performance.
+;; As a consquence, the read syntax of basic tokens can't be
+;; customized.
+;; Most of the built-in reader syntax has been replaced by lisp
+;; character macros: parentheses and brackets, simple and double
+;; quotes, semicolon comments and the dot. In addition to that, the
+;; following new syntax features are provided:
+;; Backquote-Comma-Atsign Macro: `(,el ,@list)
+;;
+;; (the clumsy Emacs Lisp syntax (` ((, el) (,@ list))) is also
+;; supported, but with one restriction: the blank behind the quote
+;; characters is mandatory when using the old syntax. The cl reader
+;; needs it as a landmark to distinguish between old and new syntax.
+;; An example:
+;;
+;; With blanks, both readers read the same:
+;; (` (, (head)) (,@ (tail))) -std-read->  (` (, (head)) (,@ (tail)))
+;; (` (, (head)) (,@ (tail))) -cl-read->   (` (, (head)) (,@ (tail)))
+;;
+;; Without blanks, the form is interpreted differently by the two readers:
+;; (`(,(head)) (,@(tail))) -std-read-> (` (, (head)) (,@ (tail)))
+;; (`(,(head)) (,@(tail))) -cl-read->  ((` ((, ((head)))) ((,@ ((tail)))))
+;;
+;;
+;; Dispatch Character Macro" `#'
+;;
+;; #'<function>			function quoting
+;; #\<charcter>			character syntax
+;; #.<form>    			read time evaluation
+;; #p<path>, #P<path> 		paths
+;; #+<feature>, #-<feature> 	conditional reading
+;; #<n>=, #<n># 		tags for shared structure reading
+;;
+;; Other read macros can be added easily (see the definition of the
+;; above ones in this file, using the functions `set-macro-character'
+;; and `set-dispatch-macro-character')
+;;
+;; The Cl reader is mostly downward compatile, (exception: backquote
+;; comma macro, see above). E.g., this file, which is written entirely
+;; in the standard Emacs Lisp syntax, can be read and compiled with the
+;; cl-reader activated (see Examples below).
+;; This also works with package.el for Common Lisp packages.
+;; Requirements
+;; ------------
+;; The package runs on Emacs 18 and Emacs 19 (FSF and Lucid) It is
+;; built on top of Dave Gillespie's cl.el package (version 2.02 or
+;; later).  The old one (from Ceazar Quiroz, still shiped with some
+;; Emacs 19 disributions) will not do.
+;; Usage
+;; -----
+;; The package is implemented as a kind of minor mode to the
+;; emacs-lisp-mode. As most of the Emacs Lisp files are still written
+;; in the standard Emacs Lisp syntax, the cl reader is only activated
+;; on elisp files whose property lines contain the following entry:
+;;
+;; -*- Read-Syntax: Common-Lisp -*-
+;;
+;; Note that both property name ("Read-Syntax") and value
+;; ("Common-Lisp") are not case sensitive. There can also be other
+;; properties in this line:
+;;
+;; -*- Mode: Emacs-Lisp; Read-Syntax: Common-Lisp -*-
+;; Installation
+;; ------------
+;; Save this file in a directory where Emacs will find it, then
+;; byte compile it (M-x byte-compile-file).
+;;
+;; A permanent installation of the package can be done in two ways:
+;;
+;; 1.) If you want to have the package always loaded, put this in your
+;;     .emacs, or in just the files that require it:
+;;
+;; (require 'cl-read)
+;;
+;; 2.) To load the cl-read package automatically when visiting an elisp
+;;     file that needs it, it has to be installed using the
+;;     emacs-lisp-mode-hook. In this case, put the following function
+;;     definition and add-hook form in your .emacs:
+;;
+;; (defun cl-reader-autoinstall-function ()
+;;   "Activates the Common Lisp style reader for emacs-lisp-mode buffers,
+;; if the property line has a local variable setting like this:
+;; \;\; -*- Read-Syntax: Common-Lisp -*-"
+;;
+;;   (or (boundp 'local-variable-hack-done)
+;;       (let (local-variable-hack-done
+;;             (case-fold-search t))
+;;         (hack-local-variables-prop-line 't)
+;;         (cond
+;;          ((and (boundp 'read-syntax)
+;;                read-syntax
+;;                (string-match "^common-lisp$" (symbol-name read-syntax)))
+;;           (require 'cl-read)
+;;           (make-local-variable 'cl-read-active)
+;;           (setq cl-read-active 't))))))
+;;
+;; (add-hook 'emacs-lisp-mode-hook 'cl-reader-autoinstall-function)
+;;
+;; The `cl-reader-autoinstall-function' function tests for the
+;; presence of the correct Read-Syntax property in the first line of
+;; the file and loads the cl-read package if necessary. cl-read
+;; replaces the following standard elisp functions:
+;;
+;; 	- read
+;; 	- read-from-string
+;; 	- eval-current-buffer
+;; 	- eval-buffer
+;; 	- eval-region
+;;	- eval-expression (to call reader explicitly)
+;;
+;; There may be other built-in functions that need to be replaced
+;; (e.g. load).  The behavior of the new reader function depends on
+;; the value of the buffer local variable `cl-read-active': if it is
+;; nil, they just call the original functions, otherwise they call the
+;; cl reader. If the cl reader is active in a buffer, this is
+;; indicated in the modeline by the string "CL" (minor mode like).
+;;
+;; Examples:
+;; ---------
+;; After having installed the package as described above, the
+;; following forms can be evaluated (M-C-x) with the cl reader being
+;; active. (make sure that the mode line displays "(Emacs-Lisp CL)")
+;;
+;; (setq whitespaces '(#\space #\newline #\tab))
+;; (setq more-whitespaces `(#\page ,@whitespaces #\linefeed))
+;; (setq whitespace-strings (mapcar #'char-to-string more-whitespaces))
+;;
+;; (setq shared-struct '(#1=[hello world] #1# #1#))
+;; (progn (setq cirlist '#1=(a b . #1#)) 't)
+;;
+;; This file, though written in standard Emacs Lisp syntax, can also be
+;; compiled with the cl reader active: Type M-x byte-compile-file
+;; TO DO List:
+;; -----------
+;; - Provide a replacement for load so that uncompiled cl syntax
+;;   source file can be loaded, too.  For now prohibit loading un-bytecompiled.
+;; - Do we really need the (require 'cl) dependency?   Yes.
+;; - More read macros: #S for structs, #A for array, #X for hex, #nR for radix
+;; - Refine the error signaling mechanism.
+;;     - invalid-cl-read-syntax is now defined. what else?
+; Change History
+;
+; $Log: cl-read.el-19.15-b1,v $
+; Revision 1.1.1.1  1996/12/18 03:54:31  steve
+; XEmacs 19.15-b3
+;
+; Revision 1.19  94/03/21  19:59:24  liberte
+; Add invalid-cl-read-syntax error symbol.
+; Add reader::read-sexp and reader::read-sexp-func to allow customization
+; based on the results of reading.
+; Remove more dependencies on cl-package.
+; Remove reader::eval-current-buffer, eval-buffer, and eval-region,
+; and use elisp-eval-region package instead.
+;
+; Revision 1.18  94/03/04  23:42:24  liberte
+; Fix typos in comments.
+;
+; Revision 1.17  93/11/24  12:04:09  bosch
+; cl-packages dependency removed. `reader::read-constituent' and
+; corresponding variables moved to cl-packages.el.
+; Multi-line comment #| ... |# dispatch character read macro added.
+;
+; Revision 1.16  1993/11/23  10:21:02  bosch
+; Patches from Daniel LaLiberte integrated.
+;
+; Revision 1.15  1993/11/18  21:21:10  bosch
+; `reader::symbol-regexp1' modified.
+;
+; Revision 1.14  1993/11/17  19:06:32  bosch
+; More characters added to `reader::symbol-characters'.
+; `reader::read-constituent' modified.
+; defpackage form added.
+;
+; Revision 1.13  1993/11/16  13:06:41  bosch
+; - Symbol reading for CL package convention implemented.
+;   Variables `reader::symbol-characters', `reader::symbol-regexp1' and
+;   `reader::symbol-regexp2' and functions `reader::lookup-symbol' and
+;   `reader::read-constituent' added.
+; - Prefix for internal symbols is now "reader::" (Common Lisp
+;   compatible).
+; - Dispatch character macro #: for reading uninterned symbols added.
+;
+; Revision 1.12  1993/11/07  19:29:07  bosch
+; Minor bug fix.
+;
+; Revision 1.11  1993/11/07  19:23:59  bosch
+; Comment added. Character read macro #\<char> rewritten. Now reads
+; e.g. #\meta-control-x. Needs to be checked.
+; fix in `reader::restore-shared-structure'. `cl-reader-autoinstall-function' improved.
+;
+; Revision 1.10  1993/11/06  18:35:35  bosch
+; Included Daniel LaLiberte's Patches.
+; Efficiency of `reader::restore-shared-structure' improved.
+; Implementation notes for shared structure reading added.
+;
+; Revision 1.9  1993/09/08  07:44:54  bosch
+; Comment modified.
+;
+; Revision 1.8  1993/08/10  13:43:34  bosch
+; Hook function `cl-reader-autoinstall-function' for automatic installation added.
+; Buffer local variable `cl-read-active' added: together with the above
+; hook it allows the file specific activation of the cl reader.
+;
+; Revision 1.7  1993/08/10  10:35:21  bosch
+; Functions `read*' and `read-from-string*' renamed into `reader::read'
+; and `reader::read-from-string'. Whitespace character skipping after
+; recursive reader calls removed (Emacs 19 should not need this).
+; Functions `cl-reader-install'  and `cl-reader-uninstall' updated.
+; Introduction text and  function comments added.
+;
+; Revision 1.6 1993/08/09 15:36:05 bosch Function `read*' now nearly
+; elisp compatible (no functions as streams, yet -- I don't think I
+; will ever implement this, it would be far too slow).  Elisp
+; compatible function `read-from-string*' added.  Replacements for
+; `eval-current-buffer', `eval-buffer' and `eval-region' added.
+; Renamed feature `cl-dg' in `cl', as Dave Gillespie's cl.el package
+; is rather stable now.  Function `cl-reader-install' and
+; `cl-reader-uninstall' modified.
+;
+; Revision 1.5  1993/08/09  10:23:35  bosch
+; Functions `copy-readtable' and `set-syntax-from-character' added.
+; Variable `reader::internal-standard-readtable' added.  Standard
+; readtable initialization modified. Whitespace skipping placed back
+; inside the read loop.
+;
+; Revision 1.4  1993/05/14  13:00:48  bosch
+; Included patches from Daniel LaLiberte.
+;
+; Revision 1.3  1993/05/11  09:57:39  bosch
+; `read*' renamed in `reader::read-from-buffer'. `read*' now can read
+; from strings.
+;
+; Revision 1.2  1993/05/09  16:30:50  bosch
+; (require 'cl-read) added.
+; Calling of `{before,after}-read-hook' modified.
+;
+; Revision 1.1  1993/03/29  19:37:21  bosch
+; Initial revision
+;
+;
+;;
+(require 'cl)
+(provide 'cl-read)
+;; load before compiling
+(require 'cl-read)
+;; bootstrapping with cl-packages
+;; defpackage and in-package are ignored until cl-read is installed.
+'(defpackage reader
+(:nicknames "rd")
+(:use el)
+(:export
+cl-read-active
+copy-readtable
+set-macro-character
+get-macro-character
+set-syntax-from-character
+make-dispatch-macro-character
+set-dispatch-macro-character
+get-dispatch-macro-character
+before-read-hook
+after-read-hook
+cl-reader-install
+cl-reader-uninstall
+read-syntax
+cl-reader-autoinstall-function))
+'(in-package reader)
+(autoload 'compiled-function-p "bytecomp")
+;; This makes cl-read behave as a kind of minor mode:
+(make-variable-buffer-local 'cl-read-active)
+(defvar cl-read-active nil
+"Buffer local variable that enables Common Lisp style syntax reading.")
+(setq-default cl-read-active nil)
+(or (assq 'cl-read-active minor-mode-alist)
+(setq minor-mode-alist
+	  (cons '(cl-read-active " CL") minor-mode-alist)))
+;; Define a new error symbol: invalid-cl-read-syntax
+;; XEmacs change
+(define-error 'invalid-cl-read-syntax "Invalid CL read syntax"
+'invalid-read-syntax)
+(defun reader::error (msg &rest args)
+(signal 'invalid-cl-read-syntax (list (apply 'format msg args))))
+;; The readtable
+(defvar reader::readtable-size 256
+"The size of a readtable."
+;; Actually, the readtable is a vector of size (1+
+;; reader::readtable-size), because the last element contains the
+;; symbol `readtable', used for defining `readtablep.
+)
+;; An entry of the readtable must have one of the following forms:
+;;
+;; 1. A symbol, one of {illegal, constituent, whitespace}.  It means
+;;    the character's reader class.
+;;
+;; 2. A function (i.e., a symbol with a function definition, a byte
+;;    compiled function or an uncompiled lambda expression).  It means the
+;;    character is a macro character.
+;;
+;; 3. A vector of length `reader::readtable-size'. Elements of this vector
+;;    may be `nil' or a function (see 2.). It means the charater is a
+;;    dispatch character, and the vector its dispatch fucntion table.
+(defvar *readtable*)
+(defvar reader::internal-standard-readtable)
+(defun* copy-readtable
+(&optional (from-readtable *readtable*)
+	       (to-readtable
+		(make-vector (1+ reader::readtable-size) 'illegal)))
+"Return a copy of FROM-READTABLE \(default: *readtable*\). If the
+FROM-READTABLE argument is provided as `nil', make a copy of a
+standard \(CL-like\) readtable. If TO-READTABLE is provided, modify and
+return it, otherwise create a new readtable object."
+(if (null from-readtable)
+(setq from-readtable reader::internal-standard-readtable))
+(loop for i to reader::readtable-size
+	as from-syntax = (aref from-readtable i)
+	do (setf (aref to-readtable i)
+		 (if (vectorp from-syntax)
+		     (copy-sequence from-syntax)
+		   from-syntax))
+	finally return to-readtable))
+(defmacro reader::get-readtable-entry (char readtable)
+(` (aref (, readtable) (, char))))
+(defun set-macro-character
+(char function &optional readtable)
+"Makes CHAR to be a macro character with FUNCTION as handler.
+When CHAR is seen by reader::read-from-buffer, it calls FUNCTION.
+Returns always t. Optional argument READTABLE is the readtable to set
+the macro character in (default: *readtable*)."
+(or readtable (setq readtable *readtable*))
+(or (reader::functionp function)
+(reader::error "Not valid character macro function: %s" function))
+(setf (reader::get-readtable-entry char readtable) function)
+t)
+(put 'set-macro-character 'edebug-form-spec
+'(&define sexp function-form &optional sexp))
+(put 'set-macro-character 'lisp-indent-function 1)
+(defun get-macro-character (char &optional readtable)
+"Return the function associated with the character CHAR.
+Optional READTABLE defaults to *readtable*. If char isn't a macro
+character in READTABLE, return nil."
+(or readtable (setq readtable *readtable*))
+(let ((entry (reader::get-readtable-entry char readtable)))
+(if (reader::functionp entry)
+	 entry)))
+(defun set-syntax-from-character
+(to-char from-char &optional to-readtable from-readtable)
+"Make the syntax of TO-CHAR be the same as the syntax of FROM-CHAR.
+Optional TO-READTABLE and FROM-READTABLE are the corresponding tables
+to use. TO-READTABLE defaults to the current readtable
+\(*readtable*\), and FROM-READTABLE to nil, meaning to use the
+syntaxes from the standard Lisp Readtable."
+(or to-readtable (setq to-readtable *readtable*))
+(or from-readtable
+(setq from-readtable reader::internal-standard-readtable))
+(let ((from-syntax
+	 (reader::get-readtable-entry from-char from-readtable)))
+(if (vectorp from-syntax)
+	;; dispatch macro character table
+	(setq from-syntax (copy-sequence from-syntax)))
+(setf (reader::get-readtable-entry to-char to-readtable)
+	  from-syntax))
+t)
+;; Dispatch macro character
+(defun make-dispatch-macro-character (char &optional readtable)
+"Let CHAR be a dispatch macro character in READTABLE (default: *readtable*)."
+(or readtable (setq readtable *readtable*))
+(setf (reader::get-readtable-entry char readtable)
+	;; create a dispatch character table
+	(make-vector reader::readtable-size nil)))
+(defun set-dispatch-macro-character
+(disp-char sub-char function &optional readtable)
+"Make reading CHAR1 followed by CHAR2 be handled by FUNCTION.
+Optional argument READTABLE (default: *readtable*).  CHAR1 must first be
+made a dispatch char with `make-dispatch-macro-character'."
+(or readtable (setq readtable *readtable*))
+(let ((disp-table (reader::get-readtable-entry disp-char readtable)))
+;; check whether disp-char is a valid dispatch character
+(or (vectorp disp-table)
+	(reader::error "`%c' not a dispatch macro character." disp-char))
+;; check whether function is a valid function
+(or (reader::functionp function)
+	(reader::error "Not valid dispatch character macro function: %s"
+		       function))
+(setf (aref disp-table sub-char) function)))
+(put 'set-dispatch-macro-character 'edebug-form-spec
+'(&define sexp sexp function-form &optional sexp))
+(put 'set-dispatch-macro-character 'lisp-indent-function 2)
+(defun get-dispatch-macro-character
+(disp-char sub-char &optional readtable)
+"Return the macro character function for SUB-CHAR unser DISP-CHAR.
+Optional READTABLE defaults to *readtable*.
+Returns nil if there is no such function."
+(or readtable (setq readtable *readtable*))
+(let ((disp-table (reader::get-readtable-entry disp-char readtable)))
+(and (vectorp disp-table)
+	 (reader::functionp (aref disp-table sub-char))
+	 (aref disp-table sub-char))))
+(defun reader::functionp (function)
+;; Check whether FUNCTION is a valid function object to be used
+;; as (dispatch) macro character function.
+(or (and (symbolp function) (fboundp function))
+(compiled-function-p function)
+(and (consp function) (eq (first function) 'lambda))))
+;; The basic reader loop
+;; shared and circular structure reading
+(defvar reader::shared-structure-references nil)
+(defvar reader::shared-structure-labels nil)
+(defun reader::read-sexp-func (point func)
+;; This function is called to read a sexp at POINT by calling FUNC.
+;; reader::read-sexp-func is here to be advised, e.g. by Edebug,
+;; to do something before or after reading.
+(funcall func))
+(defmacro reader::read-sexp (point &rest body)
+;; Called to return a sexp starting at POINT.  BODY creates the sexp result
+;; and should leave point after the sexp.  The body is wrapped in
+;; a lambda expression and passed to reader::read-sexp-func.
+(` (reader::read-sexp-func (, point) (function (lambda () (,@ body))))))
+(put 'reader::read-sexp 'edebug-form-spec '(form body))
+(put 'reader::read-sexp 'lisp-indent-function 2)
+(put 'reader::read-sexp 'lisp-indent-hook 1)  ;; Emacs 18
+(defconst before-read-hook nil)
+(defconst after-read-hook nil)
+;; Set the hooks to `read-char' in order to step through the reader. e.g.
+;; (add-hook 'before-read-hook '(lambda () (message "before") (read-char)))
+;; (add-hook 'after-read-hook '(lambda () (message "after") (read-char)))
+(defmacro reader::encapsulate-recursive-call (reader-call)
+;; Encapsulate READER-CALL, a form that contains a recursive call to
+;; the reader, for usage inside the main reader loop.  The macro
+;; wraps two hooks around READER-CALL: `before-read-hook' and
+;; `after-read-hook'.
+;;
+;; If READER-CALL returns normally, the macro exits immediately from
+;; the surrounding loop with the value of READER-CALL as result.  If
+;; it exits non-locally (with tag `reader-ignore'), it just returns
+;; the value of READER-CALL, in which case the surrounding reader
+;; loop continues its execution.
+;;
+;; In both cases, `before-read-hook' and `after-read-hook' are
+;; called before and after executing READER-CALL.
+;; Are there any other uses for these hooks?  Edebug doesn't need them.
+(` (prog2
+	 (run-hooks 'before-read-hook)
+	 ;; this catch allows to ignore the return, in the case that
+	 ;; reader::read-from-buffer should continue looping (e.g.
+	 ;; skipping over comments)
+	 (catch 'reader-ignore
+	   ;; this only works inside a block (e.g., in a loop):
+	   ;; go outside
+	   (return
+	    (prog1
+		(, reader-call)
+	      ;; this occurrence of the after hook fires if the
+	      ;; reader-call returns normally ...
+	      (run-hooks 'after-read-hook))))
+;; ... and that one if  it was thrown to the tag 'reader-ignore
+(run-hooks 'after-read-hook))))
+(put 'reader::encapsulate-recursive-call 'edebug-form-spec '(form))
+(put 'reader::encapsulate-recursive-call 'lisp-indent-function 0)
+(defun reader::read-from-buffer (&optional stream reader::recursive-p)
+(or (bufferp stream)
+(reader::error "Sorry, can only read on buffers"))
+(if (not reader::recursive-p)
+;; set up environment for shared structure reading
+(let (reader::shared-structure-references
+	    reader::shared-structure-labels
+	    tmp-sexp)
+	;; the reader returns an unshared sexpr, possibly containing
+	;; symbolic references
+	(setq tmp-sexp (reader::read-from-buffer stream 't))
+	(if ;; sexpr actually contained shared structures
+	    reader::shared-structure-references
+	    (reader::restore-shared-structure tmp-sexp)
+	  ;; it did not, so don't bother about restoring
+	  tmp-sexp))
+(loop for char = (following-char)
+	  for entry = (reader::get-readtable-entry  char *readtable*)
+	  if (eobp) do (reader::error "End of file during reading")
+	  do
+	  (cond
+	   ((eq entry 'illegal)
+	    (reader::error "`%c' has illegal character syntax" char))
+	   ;; skipping whitespace characters must be done inside this
+	   ;; loop as character macro subroutines may return without
+	   ;; leaving the loop using (throw 'reader-ignore ...)
+	   ((eq entry 'whitespace)
+	    (forward-char 1)
+	    ;; skip all whitespace
+	    (while (eq 'whitespace
+		       (reader::get-readtable-entry
+			(following-char) *readtable*))
+	      (forward-char 1)))
+	   ;; for every token starting with a constituent character
+	   ;; call the built-in reader (symbols, numbers, strings,
+	   ;; characters with ?<char> syntax)
+	   ((eq entry 'constituent)
+	    (reader::encapsulate-recursive-call
+	     (reader::read-constituent stream)))
+	   ((vectorp entry)
+	    ;; Dispatch macro character. The dispatch macro character
+	    ;; function is contained in the vector `entry', at the
+	    ;; place indicated by <sub-char>, the first non-digit
+	    ;; character following the <disp-char>:
+	    ;; 	<disp-char><digit>*<sub-char>
+	    (reader::encapsulate-recursive-call
+	      (loop initially do (forward-char 1)
+		    for sub-char = (prog1 (following-char)
+				     (forward-char 1))
+		    while (memq sub-char
+				'(?0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9))
+		    collect sub-char into digit-args
+		    finally
+		    (return
+		     (funcall
+		      ;; no test is done here whether a non-nil
+		      ;; contents is a correct dispatch character
+		      ;; function to apply.
+		      (or (aref entry sub-char)
+			  (reader::error
+			   "Undefined subsequent dispatch character `%c'"
+			   sub-char))
+		      stream
+		      sub-char
+		      (string-to-int
+		       (apply 'concat
+			      (mapcar
+			       'char-to-string digit-args))))))))
+	   (t
+	    ;; must be a macro character. In this case, `entry' is
+	    ;; the function to be called
+	    (reader::encapsulate-recursive-call
+	      (progn
+		(forward-char 1)
+		(funcall entry stream char))))))))
+;; Constituent reader fix for Emacs 18
+(if (string-match "^19" emacs-version)
+(defun reader::read-constituent (stream)
+(reader::read-sexp (point)
+	(reader::original-read stream)))
+(defun reader::read-constituent (stream)
+(reader::read-sexp (point)
+(prog1 (reader::original-read stream)
+	;; For Emacs 18, backing up is necessary because the `read' function
+	;; reads one character too far after reading a symbol or number.
+	;; This doesnt apply to reading chars (e.g. ?n).
+	;; This still loses for escaped chars.
+	(if (not (eq (reader::get-readtable-entry
+		      (preceding-char) *readtable*) 'constituent))
+	    (forward-char -1))))))
+;; Make the default current CL readtable
+(defconst *readtable*
+(loop with raw-readtable =
+	(make-vector (1+ reader::readtable-size) 'illegal)
+	initially do (setf (aref raw-readtable reader::readtable-size)
+			   'readtable)
+	for entry in
+	'((constituent ?! ?@ ?$ ?% ?& ?* ?_ ?- ?+ ?= ?/ ?\\ ?0 ?1 ?2
+		       ?3 ?4 ?5 ?6 ?7 ?8 ?9 ?: ?~ ?> ?< ?a ?b
+		       ?c ?d ?e ?f ?g ?h ?i ?j ?k ?l ?m ?n ?o ?p
+		       ?q ?r ?s ?t ?u ?v ?w ?x ?y ?z ?A ?B ?C ?D
+		       ?E ?F ?G ?H ?I ?J ?K ?L ?M ?N ?O ?P ?Q ?R
+		       ?S ?T ?U ?V ?W ?X ?Y ?Z)
+	  (whitespace ?  ?\t ?\n ?\r ?\f)
+	  ;; The following CL character classes are only useful for
+	  ;; token parsing.  We don't need them, as token parsing is
+	  ;; left to the built-in reader.
+	  ;; (single-escape ?\\)
+	  ;; (multiple-escape ?|)
+	  )
+	do
+	(loop for char in (rest entry)
+	      do (setf (reader::get-readtable-entry  char raw-readtable)
+		       (first entry)))
+	finally return raw-readtable)
+"The current readtable.")
+;; Variables used non-locally in the standard readmacros
+(defvar reader::context)
+(defvar reader::stack)
+(defvar reader::recursive-p)
+;;;; Read macro character definitions
+;;; Hint for modifying, testing and debugging new read macros: All the
+;;; read macros and dispatch character macros below are defined in
+;;; the `*readtable*'.  Modifications or
+;;; instrumenting with edebug are effective immediately without having to
+;;; copy the internal readtable to the standard *readtable*.  However,
+;;; if you wish to modify reader::internal-standard-readtable, then
+;;; you must recopy *readtable*.
+;; Chars and strings
+;; This is defined to distinguish chars from constituents
+;; since chars are read by the standard reader without reading too far.
+(set-macro-character ?\?
+(function
+(lambda (stream char)
+(forward-char -1)
+(reader::read-sexp (point)
+(reader::original-read stream)))))
+;; ?\M-\C-a
+;; This is defined to distinguish strings from constituents
+;; since backing up after reading a string is simpler.
+(set-macro-character ?\"
+(function
+(lambda (stream char)
+(forward-char -1)
+(reader::read-sexp (point)
+(prog1 (reader::original-read stream)
+	 ;; This is not needed with Emacs 19, but it is OK.  See above.
+	 (if (/= (preceding-char) ?\")
+	     (forward-char -1)))))))
+;; Lists and dotted pairs
+(set-macro-character ?\(
+(function
+(lambda (stream char)
+(reader::read-sexp (1- (point))
+(catch 'read-list
+	 (let ((reader::context 'list) reader::stack )
+	   ;; read list elements up to a `.'
+	   (catch 'dotted-pair
+	     (while t
+	       (setq reader::stack (cons (reader::read-from-buffer stream 't)
+					 reader::stack))))
+	   ;; In dotted pair. Read one more element
+	   (setq reader::stack (cons (reader::read-from-buffer stream 't)
+				     reader::stack)
+		 ;; signal it to the closing paren
+		 reader::context 'dotted-pair)
+	   ;; Next char *must* be the closing paren that throws read-list
+	   (reader::read-from-buffer stream 't)
+	   ;; otherwise an error is signalled
+	   (reader::error "Illegal dotted pair read syntax")))))))
+(set-macro-character ?\)
+(function
+(lambda (stream char)
+(cond ((eq reader::context 'list)
+	    (throw 'read-list (nreverse reader::stack)))
+	   ((eq reader::context 'dotted-pair)
+	    (throw 'read-list (nconc (nreverse (cdr reader::stack))
+				     (car reader::stack))))
+	   (t
+	    (reader::error "`)' doesn't end a list"))))))
+(set-macro-character ?\.
+(function
+(lambda (stream char)
+(and (eq reader::context 'dotted-pair)
+	  (reader::error "No more than one `.' allowed in list"))
+(throw 'dotted-pair nil))))
+;; '(#\a . #\b)
+;; '(a . (b . c))
+;; Vectors: [a b]
+(set-macro-character ?\[
+(function
+(lambda (stream char)
+(reader::read-sexp (1- (point))
+(let ((reader::context 'vector))
+	 (catch 'read-vector
+	   (let ((reader::context 'vector)
+		 reader::stack)
+	     (while t (push (reader::read-from-buffer stream 't)
+			    reader::stack)))))))))
+(set-macro-character ?\]
+(function
+(lambda (stream char)
+(if (eq reader::context 'vector)
+	 (throw 'read-vector (apply 'vector (nreverse reader::stack)))
+(reader::error "`]' doesn't end a vector")))))
+;; Quote and backquote/comma macro
+(set-macro-character ?\'
+(function
+(lambda (stream char)
+(reader::read-sexp (1- (point))
+(list (reader::read-sexp (point) 'quote)
+	     (reader::read-from-buffer stream 't))))))
+(set-macro-character ?\`
+(function
+(lambda (stream char)
+(if (= (following-char) ?\ )
+	 ;; old backquote syntax. This is ambigous, because
+	 ;; (`(sexp)) is a valid form in both syntaxes, but
+	 ;; unfortunately not the same.
+	 ;; old syntax: read -> (` (sexp))
+	 ;; new syntax: read -> ((` (sexp)))
+	 (reader::read-sexp (1- (point)) '\`)
+(reader::read-sexp (1- (point))
+	 (list (reader::read-sexp (point) '\`)
+	       (reader::read-from-buffer stream 't)))))))
+(set-macro-character ?\,
+(function
+(lambda (stream char)
+(cond ((eq (following-char) ?\ )
+	    ;; old syntax
+	    (reader::read-sexp (point) '\,))
+	   ((eq (following-char) ?\@)
+	    (forward-char 1)
+	    (cond ((eq (following-char) ?\ )
+		   (reader::read-sexp (point) '\,\@))
+		  (t
+		   (reader::read-sexp (- (point) 2)
+		     (list
+		      (reader::read-sexp (point) '\,\@)
+		      (reader::read-from-buffer stream 't))))))
+	   (t
+	    (reader::read-sexp (1- (point))
+	      (list
+	       (reader::read-sexp (1- (point)) '\,)
+	       (reader::read-from-buffer stream 't))))))))
+;; 'a
+;; '(a b c)
+;; (let ((a 10) (b '(20 30))) `(,a ,@b c))
+;; the old syntax is also supported:
+;; (let ((a 10) (b '(20 30))) (` ((, a) (,@ b) c)))
+;; Single line character comment:  ;
+(set-macro-character ?\;
+(function
+(lambda (stream char)
+(skip-chars-forward "^\n\r")
+(throw 'reader-ignore nil))))
+;; Dispatch character character #
+(make-dispatch-macro-character ?\#)
+(defsubst reader::check-0-infix (n)
+(or (= n 0)
+(reader::error "Numeric infix argument not allowed: %d" n)))
+(defalias 'search-forward-regexp 're-search-forward)
+;; nested multi-line comments #| ... |#
+(set-dispatch-macro-character ?\# ?\|
+(function
+(lambda (stream char n)
+(reader::check-0-infix n)
+(let ((counter 0))
+(while (search-forward-regexp "#|\\||#" nil t)
+	 (if (string-equal
+	      (buffer-substring
+	       (match-beginning 0) (match-end 0))
+	      "|#")
+	     (cond ((> counter 0)
+		    (decf counter))
+		   ((= counter 0)
+		    ;; stop here
+		    (goto-char (match-end 0))
+		    (throw 'reader-ignore nil))
+		   ('t
+		    (reader::error "Unmatching closing multicomment")))
+	   (incf counter)))
+(reader::error "Unmatching opening multicomment")))))
+;; From cl-packages.el
+(defconst reader::symbol-characters "[A-Za-z0-9-_!@$%^&*+=|~{}<>/]")
+(defconst reader::symbol-regexp2
+(format "\\(%s+\\)" reader::symbol-characters))
+(set-dispatch-macro-character ?\# ?\:
+(function
+(lambda (stream char n)
+(reader::check-0-infix n)
+(or (looking-at reader::symbol-regexp2)
+	 (reader::error "Invalid symbol read syntax"))
+(goto-char (match-end 0))
+(make-symbol
+(buffer-substring (match-beginning 0) (match-end 0))))))
+;; Function quoting: #'<function>
+(set-dispatch-macro-character ?\# ?\'
+(function
+(lambda (stream char n)
+(reader::check-0-infix n)
+;; Probably should test if cl is required by current buffer.
+;; Currently, cl will always be a feature because cl-read requires it.
+(reader::read-sexp (- (point) 2)
+(list
+	(reader::read-sexp (point) (if (featurep 'cl)  'function* 'function))
+	(reader::read-from-buffer stream 't))))))
+;; Character syntax: #\<char>
+;; Not yet implemented: #\Control-a #\M-C-a etc.
+;; This definition is not used - the next one is more general.
+'(set-dispatch-macro-character ?# ?\\
+(function
+(lambda (stream char n)
+(reader::check-0-infix n)
+(let ((next (following-char))
+name)
+(if (not (and (<= ?a next) (<= next ?z)))
+(progn (forward-char 1) next)
+(setq next (reader::read-from-buffer stream t))
+(cond ((symbolp next) (setq name (symbol-name next)))
+((integerp next) (setq name (int-to-string next))))
+(if (= 1 (length name))
+(string-to-char name)
+(case next
+(linefeed  ?\n)
+(newline   ?\r)
+(space     ?\ )
+(rubout    ?\b)
+(page      ?\f)
+(tab       ?\t)
+(return    ?\C-m)
+(t
+(reader::error "Unknown character specification `%s'"
+			     next))))))))
+)
+(defvar reader::special-character-name-table
+'(("linefeed"	. ?\n)
+("newline"	. ?\r)
+("space"	. ?\ )
+("rubout"	. ?\b)
+("page"	. ?\f)
+("tab"        . ?\t)
+("return"	. ?\C-m)))
+(set-dispatch-macro-character ?# ?\\
+(function
+(lambda (stream char n)
+(reader::check-0-infix n)
+(forward-char -1)
+;; We should read in a special package to avoid creating symbols.
+(let ((symbol (reader::read-from-buffer stream t))
+	   (case-fold-search t)
+	   name modifier character char-base)
+(setq name (symbol-name symbol))
+(if (string-match "^\\(meta-\\|m-\\|control-\\|c-\\)+" name)
+	   (setq modifier (substring name
+				     (match-beginning 1)
+				     (match-end 1))
+		 character (substring name (match-end 1)))
+	 (setq character name))
+(setq char-base
+	     (cond ((= (length character) 1)
+		    (string-to-char character))
+		   ('t
+		    (cdr (assoc character
+				reader::special-character-name-table)))))
+(or char-base
+	   (reader::error
+	    "Unknown character specification `%s'" character))
+(and modifier
+	    (progn
+	      (and (string-match "control-\\|c-" modifier)
+		   (decf char-base 32))
+	      (and (string-match "meta-\\|m-" modifier)
+		   (incf char-base 128))))
+char-base))))
+;; '(#\meta-space #\tab #\# #\> #\< #\a #\A  #\return #\space)
+;; (eq #\m-tab ?\M-\t)
+;; (eq #\c-m-x #\m-c-x)
+;; (eq #\Meta-Control-return #\M-C-return)
+;; (eq #\m-m-c-c-x #\m-c-x)
+;; #\C-space #\C-@ ?\C-@
+;; Read and load time evaluation:  #.<form>
+;; Not yet implemented: #,<form>
+(set-dispatch-macro-character ?\# ?\.
+(function
+(lambda (reader::stream reader::char reader::n)
+(reader::check-0-infix reader::n)
+;; This eval will see all internal vars of reader,
+;; e.g. stream, reader::recursive-p.  Anything that might be bound.
+;; We must use `read' here rather than read-from-buffer with 'recursive-p
+;; because the expression must not have unresolved #n#s in it anyway.
+;; Otherwise the top-level expression must be completely read before
+;; any embedded evaluation(s) occur(s).  CLtL2 does not specify this.
+;; Also, call `read' so that it may be customized, by e.g. Edebug
+(eval (read reader::stream)))))
+;; '(#.(current-buffer) #.(get-buffer "*scratch*"))
+;; Path names (kind of):  #p<string>, #P<string>,
+(set-dispatch-macro-character ?\# ?\P
+(function
+(lambda (stream char n)
+(reader::check-0-infix n)
+(let ((string (reader::read-from-buffer stream 't)))
+(or (stringp string)
+	   (reader::error "Pathname must be a string: %s" string))
+(expand-file-name string)))))
+(set-dispatch-macro-character ?\# ?\p
+(get-dispatch-macro-character ?\# ?\P))
+;; #P"~/.emacs"
+;; #p"~root/home"
+;; Feature reading:  #+<feature>,  #-<feature>
+;; Not yet implemented: #+<boolean expression>, #-<boolean expression>
+(defsubst reader::read-feature (stream char n flag)
+(reader::check-0-infix n)
+(let (;; Use the original reader to only read the feature.
+	;; This is not exactly correct without *read-suppress*.
+	;; Also Emacs 18 read goes one too far,
+	;; so we assume there is a space after the feature.
+	(feature (reader::original-read stream))
+	(object (reader::read-from-buffer stream 't)))
+(if (eq (featurep feature) flag)
+	object
+;; Ignore it.
+(throw 'reader-ignore nil))))
+(set-dispatch-macro-character ?\# ?\+
+(function
+(lambda (stream char n)
+(reader::read-feature stream char n t))))
+(set-dispatch-macro-character ?\# ?\-
+(function
+(lambda (stream char n)
+(reader::read-feature stream char n nil))))
+;; (#+cl loop #+cl do #-cl while #-cl t (body))
+;; Shared structure reading: #<n>=, #<n>#
+;; Reading of sexpression with shared and circular structure read
+;; syntax  is done in two steps:
+;;
+;; 1. Create an sexpr with unshared structures, just as the ordinary
+;;    read macros do, with two exceptions:
+;;    - each label (#<n>=) creates, as a side effect, a symbolic
+;;      reference for the sexpr that follows it
+;;    - each reference (#<n>#) is replaced by the corresponding
+;;      symbolic reference.
+;;
+;; 2. This non-cyclic and unshared lisp structure is given to the
+;;    function `reader::restore-shared-structure' (see
+;;    `reader::read-from-buffer'), which simply replaces
+;;    destructively all symbolic references by the lisp structures the
+;;    references point at.
+;;
+;; A symbolic reference is an uninterned symbol whose name is obtained
+;; from the label/reference number using the function `int-to-string':
+;;
+;; There are two non-locally used variables (bound in
+;; `reader::read-from-buffer') which control shared structure reading:
+;; `reader::shared-structure-labels':
+;;	A list of integers that correspond to the label numbers <n> in
+;;      the string currently read. This is used to avoid multiple
+;;      definitions of the same label.
+;; `reader::shared-structure-references':
+;;      The list of symbolic references that will be used as temporary
+;;      placeholders for the shared objects introduced by a reference
+;;      with the same number identification.
+(set-dispatch-macro-character ?\# ?\=
+(function
+(lambda (stream char n)
+(and (= n 0) (reader::error "0 not allowed as label"))
+;; check for multiple definition of the same label
+(if (memq n reader::shared-structure-labels)
+	 (reader::error "Label defined twice")
+(push n reader::shared-structure-labels))
+;; create an uninterned symbol as symbolic reference for the label
+(let* ((string (int-to-string n))
+	    (ref (or (find string reader::shared-structure-references
+			   :test 'string=)
+		     (first
+		      (push (make-symbol string)
+			    reader::shared-structure-references)))))
+;; the link between the symbolic reference and the lisp
+;; structure it points at is done using the symbol value cell
+;; of the reference symbol.
+(setf (symbol-value ref)
+	     ;; this is also the return value
+	     (reader::read-from-buffer stream 't))))))
+(set-dispatch-macro-character ?\# ?\#
+(function
+(lambda (stream char n)
+(and (= n 0) (reader::error "0 not allowed as label"))
+;; use the non-local variable `reader::recursive-p' (from the reader
+;; main loop) to detect labels at the top level of an sexpr.
+(if (not reader::recursive-p)
+	 (reader::error "References at top level not allowed"))
+(let* ((string (int-to-string n))
+	    (ref (or (find string reader::shared-structure-references
+			   :test 'string=)
+		     (first
+		      (push (make-symbol string)
+			    reader::shared-structure-references)))))
+;; the value of reading a #n# form is a reference symbol
+;; whose symbol value is or will be the shared structure.
+;; `reader::restore-shared-structure' then replaces the symbol by
+;; its value.
+ref))))
+(defun reader::restore-shared-structure (obj)
+;; traverses recursively OBJ and replaces all symbolic references by
+;; the objects they point at. Remember that a symbolic reference is
+;; an uninterned symbol whose value is the object it points at.
+(cond
+((consp obj)
+(loop for rest on obj
+	  as lastcdr = rest
+	  do
+	  (if;; substructure is a symbolic reference
+	      (memq (car rest) reader::shared-structure-references)
+	      ;; replace it by its symbol value, i.e. the associated object
+	      (setf (car rest) (symbol-value (car rest)))
+	    (reader::restore-shared-structure (car rest)))
+	  finally
+	  (if (memq (cdr lastcdr) reader::shared-structure-references)
+	      (setf (cdr lastcdr) (symbol-value (cdr lastcdr)))
+	    (reader::restore-shared-structure (cdr lastcdr)))))
+((vectorp obj)
+(loop for i below (length obj)
+	  do
+	  (if;; substructure  is a symbolic reference
+	      (memq (aref obj i) reader::shared-structure-references)
+	      ;; replace it by its symbol value, i.e. the associated object
+	      (setf (aref obj i) (symbol-value (aref obj i)))
+	    (reader::restore-shared-structure (aref obj i))))))
+obj)
+;; #1=(a b #3=[#2=c])
+;; (#1=[#\return #\a] #1# #1#)
+;; (#1=[a b c] #1# #1#)
+;; #1=(a b . #1#)
+;; Creation and initialization of an internal standard readtable.
+;; Do this after all the macros and dispatch chars above have been defined.
+(defconst reader::internal-standard-readtable (copy-readtable)
+"The original (CL-like) standard readtable. If you ever modify this
+readtable, you won't be able to recover a standard readtable using
+\(copy-readtable nil\)")
+;; Replace built-in functions that call the built-in reader
+;;
+;; The following functions are replaced here:
+;;
+;; read			by	reader::read
+;; read-from-string	by	reader::read-from-string
+;;
+;; eval-expression	by	reader::eval-expression
+;; Why replace eval-expression? Not needed for Lucid Emacs since the
+;; reader for arguments is also written in Lisp, and so may be overridden.
+;;
+;; eval-current-buffer  by	reader::eval-current-buffer
+;; eval-buffer		by	reader::eval-buffer
+;; original-eval-region by	reader::original-eval-region
+;; Temporary read buffer used for reading from strings
+(defconst reader::tmp-buffer
+(get-buffer-create " *CL Read*"))
+;; Save a pointer to the original read function
+(or (fboundp 'reader::original-read)
+(fset 'reader::original-read  (symbol-function 'read)))
+(defun reader::read (&optional stream reader::recursive-p)
+"Read one Lisp expression as text from STREAM, return as Lisp object.
+If STREAM is nil, use the value of `standard-input' \(which see\).
+STREAM or the value of `standard-input' may be:
+a buffer \(read from point and advance it\)
+a marker \(read from where it points and advance it\)
+a string \(takes text from string, starting at the beginning\)
+t \(read text line using minibuffer and use it\).
+This is the cl-read replacement of the standard elisp function
+`read'. The only incompatibility is that functions as stream arguments
+are not supported."
+(if (not cl-read-active)
+(reader::original-read stream)
+(if (null stream)			; read from standard-input
+	(setq stream standard-input))
+(if (eq stream 't)			; read from minibuffer
+	(setq stream (read-from-minibuffer "Common Lisp Expression: ")))
+(cond
+((bufferp stream)			; read from buffer
+(reader::read-from-buffer stream reader::recursive-p))
+((markerp stream)			; read from marker
+(save-excursion
+	(set-buffer (marker-buffer stream))
+	(goto-char (marker-position stream))
+	(reader::read-from-buffer (current-buffer) reader::recursive-p)))
+((stringp stream)			; read from string
+(save-excursion
+	(set-buffer reader::tmp-buffer)
+	(auto-save-mode -1)
+	(erase-buffer)
+	(insert stream)
+	(goto-char (point-min))
+	(reader::read-from-buffer reader::tmp-buffer reader::recursive-p)))
+(t
+(reader::error "Not a valid stream: %s" stream)))))
+;; read-from-string
+;; save a pointer to the original `read-from-string' function
+(or (fboundp 'reader::original-read-from-string)
+(fset 'reader::original-read-from-string
+	  (symbol-function 'read-from-string)))
+(defun reader::read-from-string (string &optional start end)
+"Read one Lisp expression which is represented as text by STRING.
+Returns a cons: (OBJECT-READ . FINAL-STRING-INDEX).
+START and END optionally delimit a substring of STRING from which to read;
+they default to 0 and (length STRING) respectively.
+This is the cl-read replacement of the standard elisp function
+`read-from-string'.  It uses the reader macros in *readtable* if
+`cl-read-active' is non-nil in the current buffer."
+;; Does it really make sense to have read-from-string depend on
+;; what the current buffer happens to be?   Yes, so code that
+;; has nothing to do with cl-read uses original reader.
+(if (not cl-read-active)
+(reader::original-read-from-string string start end)
+(or start (setq start 0))
+(or end (setq end (length string)))
+(save-excursion
+(set-buffer reader::tmp-buffer)
+(auto-save-mode -1)
+(erase-buffer)
+(insert (substring string 0 end))
+(goto-char (1+ start))
+(cons
+(reader::read-from-buffer reader::tmp-buffer nil)
+(1- (point))))))
+;; (read-from-string "abc (car 'a) bc" 4)
+;; (reader::read-from-string "abc (car 'a) bc" 4)
+;; (read-from-string "abc (car 'a) bc" 2 11)
+;; (reader::read-from-string "abc (car 'a) bc" 2 11)
+;; (reader::read-from-string "`(car ,first ,@rest)")
+;; (read-from-string ";`(car ,first ,@rest)")
+;; (reader::read-from-string ";`(car ,first ,@rest)")
+;; We should replace eval-expression, too, so that it reads (and
+;; evals) in the current buffer.  Alternatively, this could be fixed
+;; in C.  In Lemacs 19.6 and later, this function is already written
+;; in lisp, and based on more primitive read functions we already
+;; replaced. The reading happens during the interactive parameter
+;; retrieval, which is written in lisp, too.  So this replacement of
+;; eval-expresssion is only required fro (FSF) Emacs 18 (and 19?).
+(or (fboundp 'reader::original-eval-expression)
+(fset 'reader::original-eval-expression
+(symbol-function 'eval-expression)))
+(defun reader::eval-expression (reader::expression)
+"Evaluate EXPRESSION and print value in minibuffer.
+Value is also consed on to front of variable `values'."
+(interactive
+(list
+(car (read-from-string
+(read-from-minibuffer
+"Eval: " nil
+;;read-expression-map ;; not for emacs 18
+nil ;; use default map
+nil ;; don't do read with minibuffer current.
+;; 'edebug-expression-history ;; not for emacs 18
+)))))
+(setq values (cons (eval reader::expression) values))
+(prin1 (car values) t))
+(require 'eval-reg "eval-reg")
+(require 'advice)
+;; installing/uninstalling the cl reader
+;; These two should always be used in pairs, or just install once and
+;; never uninstall.
+(defun cl-reader-install ()
+(interactive)
+(fset 'read 			'reader::read)
+(fset 'read-from-string 	'reader::read-from-string)
+(fset 'eval-expression 	'reader::eval-expression)
+(elisp-eval-region-install))
+(defun cl-reader-uninstall ()
+(interactive)
+(fset 'read
+	(symbol-function 'reader::original-read))
+(fset 'read-from-string
+	(symbol-function 'reader::original-read-from-string))
+(fset 'eval-expression
+	(symbol-function 'reader::original-eval-expression))
+(elisp-eval-region-uninstall))
+;; Globally installing the cl-read replacement functions is safe, even
+;; for buffers without cl read syntax. The buffer local variable
+;; `cl-read-active' controls whether the replacement funtions of this
+;; package or the original ones are actually called.
+(cl-reader-install)
+(cl-reader-uninstall)
+;; Advise the redefined eval-region
+(defadvice eval-region (around cl-read activate)
+"Use the reader::read instead of the original read if cl-read-active."
+(with-elisp-eval-region (not cl-read-active)
+(ad-do-it)))
+;;(ad-unadvise 'eval-region)
+(add-hook 'emacs-lisp-mode-hook 'cl-reader-autoinstall-function)
+'(defvar read-syntax)
+'(defun cl-reader-autoinstall-function ()
+"Activates the Common Lisp style reader for emacs-lisp-mode buffers,
+if the property line has a local variable setting like this:
+\;\; -*- Read-Syntax: Common-Lisp -*-"
+;; this is a hack to avoid recursion in the case that the prop line
+;; containes "Mode: emacs-lisp" entry
+(or (boundp 'local-variable-hack-done)
+(let (local-variable-hack-done
+	    (case-fold-search t))
+	;; Usually `hack-local-variables-prop-line' is called only after
+	;; installation of the major mode. But we need to know about the
+	;; local variables before that, so we call the local variable hack
+	;; explicitly here:
+	(hack-local-variables-prop-line 't)
+	;; But hack-local-variables-prop-line not defined in emacs 18.
+	(cond
+	 ((and (boundp 'read-syntax)
+	       read-syntax
+	       (string-match "^common-lisp$" (symbol-name read-syntax)))
+	  (require 'cl-read)
+	  (make-local-variable 'cl-read-active)
+	  (setq cl-read-active 't))))))
+;; Emacs 18 doesnt have hack-local-variables-prop-line.  So use this instead.
+(defun cl-reader-autoinstall-function ()
+(save-excursion
+(goto-char (point-min))
+(let ((case-fold-search t))
+(cond ((re-search-forward
+	      "read-syntax: *common-lisp"
+	      (save-excursion
+		(end-of-line)
+		(point))
+	      t)
+	     (require 'cl-read)
+	     (make-local-variable 'cl-read-active)
+	     (setq cl-read-active t))))))
+(run-hooks 'cl-read-load-hooks)
+;; end cl-read.el

Mercurial > hg > xemacs-beta

comparison lisp/edebug/cl-read.el-19.15-b1 @ 4:b82b59fe008d r19-15b3