/interpreter/tags/at2dist030708/src/edu/vub/at/objects/natives/grammar/AGMultiDefinition.java
Java | 87 lines | 32 code | 11 blank | 44 comment | 0 complexity | 63896d79f1a0bf4a98e6ef1883156be1 MD5 | raw file
1/** 2 * AmbientTalk/2 Project 3 * AGMultiDefinition.java created on 18-aug-2006 at 10:13:58 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.eval.PartialBinder; 31import edu.vub.at.exceptions.InterpreterException; 32import edu.vub.at.objects.ATContext; 33import edu.vub.at.objects.ATObject; 34import edu.vub.at.objects.ATTable; 35import edu.vub.at.objects.grammar.ATExpression; 36import edu.vub.at.objects.grammar.ATMultiDefinition; 37import edu.vub.at.objects.natives.NATText; 38 39/** 40 * @author tvc 41 * 42 * The native implementation of a multiple definition AG element. 43 */ 44public class AGMultiDefinition extends NATAbstractGrammar implements ATMultiDefinition { 45 46 private final ATTable parameters_; 47 private final ATExpression valueExp_; 48 49 private final PartialBinder binderPartialFunction_; 50 51 public AGMultiDefinition(ATTable par, ATExpression val) throws InterpreterException { 52 parameters_ = par; 53 valueExp_ = val; 54 binderPartialFunction_ = PartialBinder.calculateResidual("multi-definition", par); 55 } 56 57 public ATTable base_parameters() { return parameters_; } 58 59 public ATExpression base_valueExpression() { return valueExp_; } 60 61 /** 62 * To evaluate a multiple definition, evaluate the right hand side to a table 63 * and bind the parameters on the left hand side to the 'arguments' of the right hand side, 64 * exactly as if they were bound during a function call. 65 * 66 * AGMULTIDEF(par,val).eval(ctx) = bind(ctx.scope, par, val.eval(ctx)) 67 * 68 * @return the evaluated arguments table 69 */ 70 public ATObject meta_eval(ATContext ctx) throws InterpreterException { 71 ATTable args = valueExp_.meta_eval(ctx).asTable(); 72 PartialBinder.defineParamsForArgs(binderPartialFunction_, ctx, args); 73 return args; 74 } 75 76 /** 77 * AGMULTIDEF(par,val).quote(ctx) = AGMULTIDEF(par.quote(ctx), val.quote(ctx)) 78 */ 79 public ATObject meta_quote(ATContext ctx) throws InterpreterException { 80 return new AGMultiDefinition(parameters_.meta_quote(ctx).asTable(), valueExp_.meta_quote(ctx).asExpression()); 81 } 82 83 public NATText meta_print() throws InterpreterException { 84 return NATText.atValue("def " + parameters_.meta_print().javaValue + " := " + valueExp_.meta_print().javaValue); 85 } 86 87}