| 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 -------------------------------------------------- |