pegutils.lisp

   1 ;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10; -*-
   2 ;;;
   3 ;;; pegutils.lisp --- Utility functions for implementing PEG parsers
   4
   5 ;; Copyright (C) 2008 Utz-Uwe Haus <lisp@uuhaus.de>
   6 ;; $Id:$
   7 ;; This code is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the version 3 of the GNU General
   9 ;; Public License as published by the Free Software Foundation, as
  10 ;; clarified by the prequel found in LICENSE.Lisp-GPL-Preface.
  11 ;;
  12 ;; This code is distributed in the hope that it will be useful, but
  13 ;; without any warranty; without even the implied warranty of
  14 ;; merchantability or fitness for a particular purpose. See the GNU
  15 ;; Lesser General Public License for more details.
  16 ;;
  17 ;; Version 3 of the GNU General Public License is in the file
  18 ;; LICENSE.GPL that was distributed with this file. If it is not
  19 ;; present, you can access it from
  20 ;; http://www.gnu.org/copyleft/gpl.txt (until superseded by a
  21 ;; newer version) or write to the Free Software Foundation, Inc., 59
  22 ;; Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23 ;;
  24 ;; Commentary:
  25
  26 ;; Some code here is inspired by the metapeg library of John Leuner
  27
  28 ;;; Code:
  29
  30
  31
  32 (in-package #:opossum)
  33 \f
  34 (defclass parse-context ()
  35   ((destpkg :accessor get-destpkg :initarg :destpkg)
  36    (grammar :accessor get-grammar :initarg :grammar))
  37   (:documentation "Parser context"))
  38
  39
  40 (defvar *opossum-parser* nil
  41   "Special variable bound to the parser context at parse time.")
  42
  43 (defun make-name (string)
  44   (intern (concatenate 'string "parse_" string)
  45           (get-destpkg *opossum-parser*)))