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sharp-backslash.lisp (3620B) | |
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1 ;;;; -*- Mode: lisp; indent-tabs-mode: nil -*- | |
2 ;;; | |
3 ;;; sharp-backslash.lisp --- Alternative #\ dispatch code. | |
4 ;;; | |
5 ;;; Copyright (C) 2007-2009, Luis Oliveira <[email protected]> | |
6 ;;; | |
7 ;;; Permission is hereby granted, free of charge, to any person | |
8 ;;; obtaining a copy of this software and associated documentation | |
9 ;;; files (the "Software"), to deal in the Software without | |
10 ;;; restriction, including without limitation the rights to use, copy, | |
11 ;;; modify, merge, publish, distribute, sublicense, and/or sell copies | |
12 ;;; of the Software, and to permit persons to whom the Software is | |
13 ;;; furnished to do so, subject to the following conditions: | |
14 ;;; | |
15 ;;; The above copyright notice and this permission notice shall be | |
16 ;;; included in all copies or substantial portions of the Software. | |
17 ;;; | |
18 ;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
19 ;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
20 ;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
21 ;;; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | |
22 ;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
23 ;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
24 ;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
25 ;;; DEALINGS IN THE SOFTWARE. | |
26 | |
27 (in-package #:babel) | |
28 | |
29 #-allegro | |
30 (defun sharp-backslash-reader (original-reader stream char numarg) | |
31 (let ((1st-char (read-char stream))) | |
32 (if (and (char-equal 1st-char #\u) | |
33 ;; because #\z is not a digit char... | |
34 (digit-char-p (peek-char nil stream nil #\z) 16)) | |
35 ;; something better than READ would be nice here | |
36 (let ((token (let ((*read-base* 16)) (read stream)))) | |
37 (if (typep token 'babel-encodings::code-point) | |
38 (code-char token) | |
39 (if *read-suppress* | |
40 nil | |
41 (simple-reader-error | |
42 stream "Unrecognized character name: u~A" token)))) | |
43 (funcall original-reader | |
44 (make-concatenated-stream (make-string-input-stream | |
45 (string 1st-char)) | |
46 stream) | |
47 char | |
48 numarg)))) | |
49 | |
50 ;;; Allegro's PEEK-CHAR seems broken in some situations, and the code | |
51 ;;; above would generate an error about too many calls to UNREAD-CHAR. | |
52 ;;; Then Allegro's original SHARP-BACKSLASH wants to UNREAD-CHAR | |
53 ;;; twice, very weird. This is the best workaround I could think of. | |
54 ;;; It sucks. | |
55 #+allegro | |
56 (defun sharp-backslash-reader (original-reader stream char numarg) | |
57 (let* ((1st-char (read-char stream)) | |
58 (rest (ignore-errors (excl::read-extended-token stream))) | |
59 (code (when (and rest (char-equal 1st-char #\u)) | |
60 (ignore-errors (parse-integer rest :radix 16))))) | |
61 (if code | |
62 (code-char code) | |
63 (with-input-from-string | |
64 (s (concatenate 'string "#\\" (string 1st-char) rest)) | |
65 (read-char s) | |
66 (read-char s) | |
67 (funcall original-reader s char numarg))))) | |
68 | |
69 (defun make-sharp-backslash-reader () | |
70 (let ((original-sharp-backslash (get-dispatch-macro-character #\# #\\)… | |
71 (lambda (stream char numarg) | |
72 (sharp-backslash-reader original-sharp-backslash stream char numar… | |
73 | |
74 (defmacro enable-sharp-backslash-syntax () | |
75 `(eval-when (:compile-toplevel :execute) | |
76 (setf *readtable* (copy-readtable *readtable*)) | |
77 (set-sharp-backslash-syntax-in-readtable) | |
78 (values))) | |
79 | |
80 (defun set-sharp-backslash-syntax-in-readtable () | |
81 (set-dispatch-macro-character #\# #\\ (make-sharp-backslash-reader)) | |
82 (values)) |