/interpreter/tags/at2-build060407/src/edu/vub/at/objects/natives/NATContext.java
Java | 82 lines | 36 code | 12 blank | 34 comment | 0 complexity | 57b4f1c33ee7f10c0939abb011c7ef87 MD5 | raw file
1/** 2 * AmbientTalk/2 Project 3 * NATContext.java created on Jul 24, 2006 at 11:22:36 PM 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; 29 30import edu.vub.at.exceptions.InterpreterException; 31import edu.vub.at.objects.ATContext; 32import edu.vub.at.objects.ATObject; 33import edu.vub.at.objects.ATTable; 34import edu.vub.at.objects.coercion.NativeStripes; 35 36/** 37 * NATContext is a purely functional implementation of the ATContext interface. 38 * It allows for storing the context parameters (scope self super) in such a way 39 * that no ill-placed assignment may affect other frames on the stack. 40 * 41 * @author smostinc 42 */ 43public class NATContext extends NATByCopy implements ATContext { 44 45 private final ATObject scope_; 46 private final ATObject self_; 47 48 public NATContext(ATObject scope, ATObject self) { 49 scope_ = scope; 50 self_ = self; 51 } 52 53 public ATObject base_getLexicalScope() { 54 return scope_; 55 } 56 57 public ATObject base_getSelf() { 58 return self_; 59 } 60 61 public ATContext base_withLexicalEnvironment(ATObject scope) { 62 return new NATContext(scope, self_); 63 } 64 65 public ATContext base_withDynamicReceiver(ATObject self) { 66 return new NATContext(scope_, self); 67 } 68 69 public NATText meta_print() throws InterpreterException { 70 return NATText.atValue("<context("+scope_.meta_print().javaValue+ 71 ","+self_.meta_print().javaValue+")>"); 72 } 73 74 public ATTable meta_getStripes() throws InterpreterException { 75 return NATTable.of(NativeStripes._CONTEXT_); 76 } 77 78 public ATObject meta_clone() throws InterpreterException { 79 return this; 80 } 81 82}