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lex.lisp
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lex.lisp
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;;; Implementation of Arc in SBCL
;;; 2008 (c) Pau Fernandez
;;; See COPYING for details
(in-package :arc)
(declaim #.*arc-opt*)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;
;;;; Bracket notation
(eval-when (:compile-toplevel :load-toplevel :execute)
(set-macro-character #\]
(get-macro-character #\) nil))
(set-macro-character #\[
#'(lambda (stream char)
(declare (ignore char))
(list 'fn (list (intern "_"))
(read-delimited-list #\] stream t)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;
;;;; Handle package marker #\:
;; Version 1: Fragile hack...
(defun %copy-trait-table (tab)
(let* ((sz (length tab))
(newtab (make-array sz :element-type '(unsigned-byte 8))))
(dotimes (i sz)
(setf (aref newtab i) (aref tab i)))
newtab))
(defmacro w/no-colon (&body body)
`(let* ((old sb-impl::*constituent-trait-table*)
(new (%copy-trait-table old)))
(setf (elt new (char-code #\:))
sb-impl::+char-attr-constituent+)
(let ((sb-impl::*constituent-trait-table* new))
,@body)))
#|
;; Version 2: Gray streams...
(defclass wrap-stream (fundamental-stream)
((stream :initarg :wrap :reader %stream)))
(defmethod stream-element-type ((s wrap-stream))
(stream-element-type (%stream s)))
(defmethod close ((s wrap-stream) &key abort)
(close (%stream s) :abort abort))
(defclass esc-stream (wrap-stream)
((echar :initarg :escape :accessor %char)
(esc? :initform nil :accessor esc?)))
(defmethod stream-read-char ((s esc-stream))
(if (esc? s)
(prog1 (%char s) (setf (esc? s) nil))
(let ((c (read-char (%stream s) nil :eof)))
(cond ((eql c :eof) :eof)
((char= c (%char s))
(prog1 #\\ (setf (esc? s) t)))
(t c)))))
(defmethod stream-unread-char ((s esc-stream) char)
(if (esc? s)
(setf (esc? s) nil)
(unread-char char (%stream s))))
(defmethod stream-peek-char ((s esc-stream))
(if (esc? s)
(%char s)
(let ((c (peek-char nil (%stream s))))
(if (char= c (%char s)) #\\ c))))
(defun new-esc-stream (esc-char stream)
(make-instance 'esc-stream
:escape esc-char
:wrap stream))
;;;; Transform ':' into '\:' throughout.
(defmacro w/no-colon ((var stream) &body body)
`(with-open-stream (,var (new-esc-stream #\: ,stream))
,@body))
|#