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1 | ;;; -*-lisp-*- |
2 | ;;; | |
3 | ;;; Parser contexts for scanners | |
4 | ;;; | |
5 | ;;; (c) 2009 Straylight/Edgeware | |
6 | ;;; | |
7 | ||
8 | ;;;----- Licensing notice --------------------------------------------------- | |
9 | ;;; | |
10 | ;;; This file is part of the Sensble Object Design, an object system for C. | |
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 | ;;; Basic scanner behaviour. | |
30 | ||
31 | ;; Basic scanners. | |
32 | ||
33 | (defmethod parser-step ((context scanner-context)) | |
34 | `(scanner-step ,(parser-scanner context))) | |
35 | ||
36 | (defmethod parser-at-eof-p ((context scanner-context)) | |
37 | `(scanner-at-eof-p ,(parser-scanner context))) | |
38 | ||
39 | (defmethod parser-capture-place ((context scanner-context)) | |
40 | `(scanner-capture-place ,(parser-scanner context))) | |
41 | ||
42 | (defmethod parser-restore-place ((context scanner-context) place) | |
43 | `(scanner-restore-place ,(parser-scanner context) ,place)) | |
44 | ||
45 | (defmethod parser-release-place ((context scanner-context) place) | |
46 | `(scanner-release-place ,(parser-scanner context) ,place)) | |
47 | ||
48 | ;; Character scanners. | |
49 | ||
50 | (defmethod parser-current-char ((context character-scanner-context)) | |
51 | `(scanner-current-char ,(parser-scanner context))) | |
52 | ||
53 | ;; Token scanners. | |
54 | ||
55 | (defmethod parser-token-type ((context token-scanner-context)) | |
56 | `(token-type ,(parser-scanner context))) | |
57 | ||
58 | (defmethod parser-token-value ((context token-scanner-context)) | |
59 | `(token-value ,(parser-scanner context))) | |
60 | ||
61 | ;;;-------------------------------------------------------------------------- | |
62 | ;;; Contexts for specific scanner classes. | |
63 | ||
64 | ;; String scanner. | |
65 | ||
66 | (defclass string-scanner-context (character-scanner-context) | |
67 | () | |
68 | (:documentation | |
69 | "Specialized parser context for scanning strings. | |
70 | ||
71 | Most notably, string positions don't need to be released, which means that | |
72 | the expanded code doesn't need to do install `unwind-protect' handlers.")) | |
73 | ||
74 | (defmethod parser-places-must-be-released-p | |
75 | ((context string-scanner-context)) | |
76 | nil) | |
77 | ||
78 | ;; List scanner. | |
79 | ||
80 | (defclass list-scanner-context (token-scanner-context) | |
81 | () | |
82 | (:documentation | |
83 | "Specialized scanner contexts for the list scanner.")) | |
84 | ||
85 | (defmethod parser-places-must-be-released-p ((context list-scanner-context)) | |
86 | nil) | |
87 | ||
88 | ;;;----- That's all, folks -------------------------------------------------- |