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external-format.lisp (3688B) | |
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1 ;;;; -*- Mode: lisp; indent-tabs-mode: nil -*- | |
2 ;;; | |
3 ;;; external-format.lisp --- External format classes and functions. | |
4 ;;; | |
5 ;;; Copyright (C) 2007, 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 (defvar *default-eol-style* | |
30 #+windows :crlf | |
31 #-windows :lf | |
32 "The end-of-line style used by external formats if none is | |
33 explicitly given. Depends on the OS the code is compiled on.") | |
34 | |
35 (deftype eol-style () | |
36 "Possible end-of-line styles." | |
37 '(member :cr :lf :crlf)) | |
38 | |
39 (defclass external-format () | |
40 ((encoding :initarg :encoding :reader external-format-encoding | |
41 :type character-encoding) | |
42 (eol-style :initarg :eol-style :reader external-format-eol-style | |
43 :type eol-style :initform *default-eol-style*)) | |
44 (:documentation | |
45 "An EXTERNAL-FORMAT consists in a combination of a Babel | |
46 CHARACTER-ENCODING and an end-of-line style.")) | |
47 | |
48 (defmethod print-object ((ef external-format) stream) | |
49 (print-unreadable-object (ef stream :type t :identity t) | |
50 (format stream "~A ~A" | |
51 (enc-name (external-format-encoding ef)) | |
52 (external-format-eol-style ef)))) | |
53 | |
54 ;;; This interface is still somewhat sketchy. The rest of Babel | |
55 ;;; doesn't really understand external formats, for instance. | |
56 (defun make-external-format (encoding &key (eol-style *default-eol-style… | |
57 (check-type eol-style eol-style) | |
58 (make-instance 'external-format | |
59 :encoding (get-character-encoding encoding) | |
60 :eol-style eol-style)) | |
61 | |
62 (defun ensure-external-format (thing) | |
63 (etypecase thing | |
64 (external-format thing) | |
65 (character-encoding (make-instance 'external-format :encoding thing)) | |
66 (symbol (make-external-format thing)) | |
67 (list (apply #'make-external-format thing)))) | |
68 | |
69 (defun external-format-equal (ef1 ef2) | |
70 (and (eq (external-format-encoding ef1) (external-format-encoding ef2)) | |
71 (eq (external-format-eol-style ef1) (external-format-eol-style ef… | |
72 | |
73 (declaim (inline lookup-mapping)) | |
74 (defun lookup-mapping (ht encoding) | |
75 "HT should be an hashtable created by | |
76 INSTANTIATE-CONCRETE-MAPPINGS. ENCODING should be either an | |
77 external format, an encoding object or a keyword symbol | |
78 denoting a character encoding name or one of its aliases." | |
79 (or (etypecase encoding | |
80 (keyword | |
81 (gethash encoding ht)) | |
82 (babel-encodings::concrete-mapping | |
83 encoding) | |
84 (character-encoding | |
85 (gethash (enc-name encoding) ht)) | |
86 (external-format | |
87 (gethash (enc-name (external-format-encoding encoding)) ht))) | |
88 (error "~S is not a valid encoding designator" encoding))) |