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;;; common.lisp --- common stuff
;;; Copyright (C) 2003-2006, 2009 by Walter C. Pelissero
;;; Author: Walter C. Pelissero <walter@pelissero.de>
;;; Project: NPG a Naive Parser Generator
#+cmu (ext:file-comment "$Module: common.lisp $")
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Lesser General Public License
;;; as published by the Free Software Foundation; either version 2.1
;;; of the License, or (at your option) any later version.
;;; This library is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; Lesser General Public License for more details.
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with this library; if not, write to the Free
;;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
;;; 02111-1307 USA
(in-package :naive-parser-generator)
(eval-when (:compile-toplevel :load-toplevel)
(defstruct grammar
rules
keywords
equal-p)
(defstruct rule
name
productions)
(defstruct (production (:conc-name prod-))
tokens
(tokens-length 0 :type fixnum)
action)
(defstruct token
type ; type of token (identifier, number, ...)
value ; its actual value
position) ; line/column in the input stream
) ; eval-when
(defmethod print-object ((obj rule) stream)
(format stream "#R(~A)" (rule-name obj)))
(defmethod print-object ((obj production) stream)
(format stream "#P(action: ~S)" (prod-action obj)))
(defmethod print-object ((obj token) stream)
(format stream "#T:~A=~S" (token-type obj) (token-value obj)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(declaim (inline make-rules-table find-rule add-rule))
(defun make-rules-table ()
(make-hash-table))
(defun find-rule (rule-name rules)
(gethash rule-name rules))
(defun add-rule (rule-name rule rules)
(setf (gethash rule-name rules) rule))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(declaim (inline make-keywords-table find-keyword add-keyword))
(defun make-keywords-table ()
(make-hash-table :test 'equal))
(defun find-keyword (keyword-name keywords)
(gethash keyword-name keywords))
(defun add-keyword (keyword keywords)
(setf (gethash keyword keywords) t))
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