~mdw / sod / blame
| Commit | Line | Data |
|---|---|---|
| dea4d055 MW |
1 | ;;; -*-lisp-*- |
| 2 | ;;; | |
| 3 | ;;; Tokenizing scanner | |
| 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 | ;;; Token scanner implementation. | |
| 30 | ||
| 31 | (defmethod shared-initialize :after | |
| 32 | ((scanner token-scanner) slot-names &key) | |
| 33 | (declare (ignore slot-names)) | |
| 34 | (scanner-step scanner)) | |
| 35 | ||
| 36 | (defmethod scanner-at-eof-p ((scanner token-scanner)) | |
| 37 | (with-slots (type) scanner | |
| 38 | (eq type :eof))) | |
| 39 | ||
| 40 | (defmethod scanner-step ((scanner token-scanner)) | |
| 41 | (with-slots (type value tail captures line column) scanner | |
| bf090e02 MW |
42 | (acond ((and tail (token-scanner-place-next tail)) |
| 43 | (setf type (token-scanner-place-type it) | |
| 44 | value (token-scanner-place-value it) | |
| 45 | line (token-scanner-place-line it) | |
| 46 | column (token-scanner-place-column it) | |
| 47 | tail it)) | |
| 48 | (t | |
| 49 | (multiple-value-bind (ty val) (scanner-token scanner) | |
| 50 | (setf type ty | |
| 51 | value val) | |
| 52 | (if (plusp captures) | |
| 53 | (let ((next (make-token-scanner-place | |
| 54 | :type ty :value val | |
| 55 | :line line :column column))) | |
| 56 | (setf (token-scanner-place-next tail) next | |
| 57 | tail next)) | |
| 58 | (setf tail nil))))))) | |
| dea4d055 MW |
59 | |
| 60 | (defmethod scanner-capture-place ((scanner token-scanner)) | |
| 61 | (with-slots (type value captures tail line column) scanner | |
| 62 | (incf captures) | |
| 63 | (or tail | |
| 64 | (setf tail (make-token-scanner-place | |
| 65 | :type type :value value :line line :column column))))) | |
| 66 | ||
| 67 | (defmethod scanner-restore-place ((scanner token-scanner) place) | |
| 68 | (with-slots (type value tail line column) scanner | |
| 69 | (setf type (token-scanner-place-type place) | |
| 70 | value (token-scanner-place-value place) | |
| 71 | line (token-scanner-place-line place) | |
| 72 | column (token-scanner-place-column place) | |
| 73 | tail place))) | |
| 74 | ||
| 75 | (defmethod scanner-release-place ((scanner token-scanner) place) | |
| 76 | (with-slots (captures) scanner | |
| 77 | (decf captures))) | |
| 78 | ||
| 79 | ;;;----- That's all, folks -------------------------------------------------- |