/interpreter/tags/at2dist130208/src/edu/vub/at/objects/natives/grammar/NATAbstractGrammar.java
Java | 56 lines | 12 code | 6 blank | 38 comment | 0 complexity | 3ff4a084d2a2f47adee8b534c37d8069 MD5 | raw file
1/** 2 * AmbientTalk/2 Project 3 * NATAbstractGrammar.java created on 26-jul-2006 at 11:57:00 4 * (c) Programming Technology Lab, 2006 - 2007 5 * Authors: Tom Van Cutsem & Stijn Mostinckx 6 * 7 * Permission is hereby granted, free of charge, to any person 8 * obtaining a copy of this software and associated documentation 9 * files (the "Software"), to deal in the Software without 10 * restriction, including without limitation the rights to use, 11 * copy, modify, merge, publish, distribute, sublicense, and/or 12 * sell copies of the Software, and to permit persons to whom the 13 * Software is furnished to do so, subject to the following 14 * conditions: 15 * 16 * The above copyright notice and this permission notice shall be 17 * included in all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 21 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 22 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 23 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 24 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 26 * OTHER DEALINGS IN THE SOFTWARE. 27 */ 28package edu.vub.at.objects.natives.grammar; 29 30import edu.vub.at.exceptions.InterpreterException; 31import edu.vub.at.objects.ATAbstractGrammar; 32import edu.vub.at.objects.ATTable; 33import edu.vub.at.objects.coercion.NativeTypeTags; 34import edu.vub.at.objects.natives.NATByCopy; 35import edu.vub.at.objects.natives.NATTable; 36 37/** 38 * @author tvc 39 * 40 * NATAbstractGrammar is the common superclass of all native ambienttalk objects 41 * that represent abstract grammar parse tree elements. That is, any object that 42 * can be returned as part of the AST produced by the native parser. 43 */ 44public abstract class NATAbstractGrammar extends NATByCopy implements ATAbstractGrammar { 45 46 // This is an empty superclass used only for proper documentation and 47 // to identify which native objects can be output by the parser. 48 49 // subclasses of NATAbstractGrammar will override meta_eval and meta_quote as appropriate, 50 // except for the literal grammar elements which can inherit the self-evaluating behaviour of NATNil. 51 52 public ATTable meta_typeTags() throws InterpreterException { 53 return NATTable.of(NativeTypeTags._ABSTRACTGRAMMAR_, NativeTypeTags._ISOLATE_); 54 } 55 56}