Created
May 7, 2010 11:51
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brackets.lisp
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#+:xyzzy | |
(require 'cmu_loop) | |
(defpackage :brackets | |
(:use #-xyzzy :cl #+xyzzy :lisp)) | |
(in-package :brackets) | |
(export '(enable-brackets | |
disable-brackets)) | |
(defvar *brackets-readtable* nil) | |
(defvar *backup-readtable* nil) | |
(defun bracket-reader (stream char) | |
(declare (ignore char)) | |
`(lambda (,(intern "_")) | |
,(read-delimited-list #\] stream t))) | |
(defun sharp-bracket-reader (stream char n) | |
(declare (ignore char)) | |
(let ((args (loop for n from 1 to (or n 0) | |
collect (intern (format nil "_~A" n)))) | |
(body (read-delimited-list #\] stream t))) | |
`(lambda ,args ,body))) | |
(defun enable-brackets () | |
(unless #1=*brackets-readtable* | |
(setq #1# (copy-readtable)) | |
(set-macro-character #\[ #'bracket-reader nil #1#) | |
(set-dispatch-macro-character #\# #\[ #'sharp-bracket-reader #1#) | |
(set-syntax-from-char #\] #\) #1# #1#) | |
#+:xyzzy | |
(ed:set-syntax-match ed::*lisp-mode-syntax-table* #\[ #\]) | |
(setq *backup-readtable* (copy-readtable))) | |
(setq *readtable* #1#) | |
t) | |
(defun disable-brackets () | |
(if *backup-readtable* | |
(setq *readtable* *backup-readtable*) | |
nil)) | |
(provide 'brackets) |
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