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1 | ;;; -*-lisp-*- |
2 | ;;; | |
3 | ;;; Basic scanner interface | |
4 | ;;; | |
5 | ;;; (c) 2009 Straylight/Edgeware | |
6 | ;;; | |
7 | ||
8 | ;;;----- Licensing notice --------------------------------------------------- | |
9 | ;;; | |
e0808c47 | 10 | ;;; This file is part of the Sensible Object Design, an object system for C. |
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11 | ;;; |
12 | ;;; SOD is free software; you can redistribute it and/or modify | |
13 | ;;; it under the terms of the GNU General Public License as published by | |
14 | ;;; the Free Software Foundation; either version 2 of the License, or | |
15 | ;;; (at your option) any later version. | |
16 | ;;; | |
17 | ;;; SOD is distributed in the hope that it will be useful, | |
18 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;;; GNU General Public License for more details. | |
21 | ;;; | |
22 | ;;; You should have received a copy of the GNU General Public License | |
23 | ;;; along with SOD; if not, write to the Free Software Foundation, | |
24 | ;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
25 | ||
26 | (cl:in-package #:sod-parser) | |
27 | ||
28 | ;;;-------------------------------------------------------------------------- | |
29 | ;;; Common scanner implementation.. | |
30 | ||
31 | (defmethod file-location ((scanner character-scanner)) | |
32 | (scanner-file-location scanner)) | |
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33 | |
34 | (defmethod file-location ((scanner token-scanner)) | |
35 | (scanner-file-location scanner)) | |
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36 | |
37 | ;;;-------------------------------------------------------------------------- | |
38 | ;;; Streams on character scanners. | |
39 | ||
40 | (defmethod stream-read-char ((stream character-scanner-stream)) | |
41 | (with-slots (scanner) stream | |
42 | (if (scanner-at-eof-p scanner) | |
43 | :eof | |
44 | (prog1 (scanner-current-char scanner) | |
45 | (scanner-step scanner))))) | |
46 | ||
47 | (defmethod stream-unread-char ((stream character-scanner-stream) char) | |
48 | (with-slots (scanner) stream | |
49 | (scanner-unread scanner char))) | |
50 | ||
51 | (defmethod stream-peek-char ((stream character-scanner-stream)) | |
52 | (with-slots (scanner) stream | |
53 | (scanner-current-char scanner))) | |
54 | ||
55 | ;;;-------------------------------------------------------------------------- | |
56 | ;;; String scanner. | |
57 | ||
58 | ;; This is much more convenient for testing lexers than the full character | |
59 | ;; buffer scanner. | |
60 | ||
61 | (export '(string-scanner make-string-scanner string-scanner-p)) | |
62 | (defstruct (string-scanner | |
63 | (:constructor make-string-scanner | |
f5992dc3 | 64 | (string &key (start 0) end filename |
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65 | &aux (%string string) |
66 | (index start) | |
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67 | (limit (or end (length string)))))) |
68 | "Scanner structure for a simple string scanner." | |
4b8e5c03 | 69 | (%string "" :type string :read-only t) |
f5992dc3 | 70 | (filename "<string>" :type string :read-only t) |
dea4d055 | 71 | (index 0 :type (and fixnum unsigned-byte)) |
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72 | (limit nil :type (and fixnum unsigned-byte) :read-only t) |
73 | (line 1 :type fixnum) | |
74 | (column 0 :type fixnum)) | |
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75 | (define-access-wrapper string-scanner-string string-scanner-%string |
76 | :read-only t) | |
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77 | |
78 | (defmethod scanner-at-eof-p ((scanner string-scanner)) | |
79 | (>= (string-scanner-index scanner) (string-scanner-limit scanner))) | |
80 | ||
81 | (defmethod scanner-current-char ((scanner string-scanner)) | |
82 | (char (string-scanner-string scanner) (string-scanner-index scanner))) | |
83 | ||
84 | (defmethod scanner-step ((scanner string-scanner)) | |
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85 | (let ((index (string-scanner-index scanner))) |
86 | (setf (values (string-scanner-line scanner) | |
87 | (string-scanner-column scanner)) | |
88 | (update-position (char (string-scanner-string scanner) index) | |
89 | (string-scanner-line scanner) | |
90 | (string-scanner-column scanner)) | |
91 | (string-scanner-index scanner) (1+ index)))) | |
dea4d055 | 92 | |
2392e488 | 93 | (defmethod scanner-unread ((scanner string-scanner) char) |
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94 | (let ((index (1- (string-scanner-index scanner)))) |
95 | (setf (values (string-scanner-line scanner) | |
96 | (string-scanner-column scanner)) | |
97 | (backtrack-position (char (string-scanner-string scanner) index) | |
98 | (string-scanner-line scanner) | |
99 | (string-scanner-column scanner)) | |
100 | (string-scanner-index scanner) index))) | |
101 | ||
102 | (defmethod scanner-filename ((scanner string-scanner)) | |
103 | (string-scanner-filename scanner)) | |
104 | (defmethod scanner-line ((scanner string-scanner)) | |
105 | (string-scanner-line scanner)) | |
106 | (defmethod scanner-column ((scanner string-scanner)) | |
107 | (string-scanner-column scanner)) | |
108 | (defmethod file-location ((scanner string-scanner)) | |
109 | (make-file-location (string-scanner-filename scanner) | |
110 | (string-scanner-line scanner) | |
111 | (string-scanner-column scanner))) | |
2392e488 | 112 | |
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113 | (defmethod scanner-capture-place ((scanner string-scanner)) |
114 | (string-scanner-index scanner)) | |
115 | ||
116 | (defmethod scanner-restore-place ((scanner string-scanner) place) | |
117 | (setf (string-scanner-index scanner) place)) | |
118 | ||
119 | (defmethod scanner-interval | |
120 | ((scanner string-scanner) place-a &optional place-b) | |
4b8e5c03 | 121 | (with-slots ((string %string) index) scanner |
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122 | (subseq string place-a (or place-b index)))) |
123 | ||
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124 | (defmethod make-scanner-stream ((scanner string-scanner)) |
125 | (make-instance 'character-scanner-stream :scanner scanner)) | |
126 | ||
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127 | ;;;-------------------------------------------------------------------------- |
128 | ;;; List scanner. | |
129 | ||
61c7351e | 130 | (export '(list-scanner list-scanner-p make-list-scanner)) |
dea4d055 | 131 | (defstruct (list-scanner |
4b8e5c03 | 132 | (:constructor make-list-scanner (list &aux (%list list)))) |
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133 | "Simple token scanner for lists. |
134 | ||
135 | The list elements are the token semantic values; the token types are the | |
136 | names of the elements' classes. This is just about adequate for testing | |
137 | purposes, but is far from ideal for real use." | |
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138 | (%list nil :type list)) |
139 | (define-access-wrapper list-scanner-list list-scanner-%list) | |
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140 | |
141 | (defmethod scanner-step ((scanner list-scanner)) | |
142 | (pop (list-scanner-list scanner))) | |
143 | ||
144 | (defmethod scanner-at-eof-p ((scanner list-scanner)) | |
145 | (null (list-scanner-list scanner))) | |
146 | ||
147 | (defmethod token-type ((scanner list-scanner)) | |
148 | (class-name (class-of (car (list-scanner-list scanner))))) | |
149 | ||
150 | (defmethod token-value ((scanner list-scanner)) | |
151 | (car (list-scanner-list scanner))) | |
152 | ||
153 | (defmethod scanner-capture-place ((scanner list-scanner)) | |
154 | (list-scanner-list scanner)) | |
155 | ||
156 | (defmethod scanner-restore-place ((scanner list-scanner) place) | |
157 | (setf (list-scanner-list scanner) place)) | |
158 | ||
159 | ;;;----- That's all, folks -------------------------------------------------- |