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/interpreter/tags/at_build150307/src/edu/vub/at/objects/natives/grammar/AGDelegationCreation.java

http://ambienttalk.googlecode.com/
Java | 70 lines | 22 code | 7 blank | 41 comment | 0 complexity | f3597c46dd416f5a635422a6e49e3db2 MD5 | raw file
 1/**
 2 * AmbientTalk/2 Project
 3 * AGDelegationCreation.java created on 29-jan-2007 at 16:22:25
 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.Evaluator;
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.ATSymbol;
36import edu.vub.at.objects.natives.NATDelegation;
37
38/**
39 * The native implementation of a first-class delegating message send.
40 *
41 * @author tvcutsem
42 */
43public final class AGDelegationCreation extends AGMessageCreation {
44	
45	public AGDelegationCreation(ATSymbol sel, ATTable args) {
46		super(sel, args);
47	}
48
49	/**
50	 * To evaluate a first-class delegation message creation AG element, transform the selector
51	 * and evaluated arguments into a first-class NATDelegation object.
52	 * It is important to note that the arguments are all eagerly evaluated.
53	 * 
54	 * AGDEL(sel,arg).eval(ctx) = NATDEL(sel, map eval(ctx) over arg )
55	 * 
56	 * @return a first-class delegating message send
57	 */
58	public ATObject meta_eval(ATContext ctx) throws InterpreterException {
59		return new NATDelegation(ctx.base_getSelf(), // the current 'self' is the delegator, to which 'self' should remain bound
60				                 this.base_getSelector(),
61				                 Evaluator.evaluateArguments(this.base_getArguments().asNativeTable(), ctx));
62	}
63
64	protected ATObject newQuoted(ATSymbol quotedSel, ATTable quotedArgs) {
65		return new AGDelegationCreation(quotedSel, quotedArgs);
66	}
67	
68	protected String getMessageToken() { return "^"; }
69
70}