/interpreter/tags/at2dist130208/src/edu/vub/at/objects/natives/grammar/AGFieldSelectionCreation.java

 1/**
 2 * AmbientTalk/2 Project
 3 * AGFieldSelectionCreation.java created on 26-jul-2006 at 16:18:10
 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.ATContext;
32import edu.vub.at.objects.ATMessage;
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.ATFieldSelectionCreation;
37import edu.vub.at.objects.grammar.ATSymbol;
38import edu.vub.at.objects.natives.NATFieldSelection;
39import edu.vub.at.objects.natives.NATTable;
40import edu.vub.at.objects.natives.NATText;
41
42/**
43 * @author tvcutsem
44 *
45 * The native implementation of a first-class field creation AG element.
46 */
47public final class AGFieldSelectionCreation extends AGMessageCreation
48      										  implements ATFieldSelectionCreation {
49	
50	/** create a field selection based on a message creation AG element */
51	public AGFieldSelectionCreation(ATSymbol sel, ATExpression annotations) {
52		super(sel, NATTable.EMPTY, annotations);
53	}
54
55	/**
56	 * To evaluate a first-class field selection creation AG element, transform the selector
57	 * and evaluated arguments into a first-class FieldSelection.
58	 * It is important to note that the arguments are all eagerly evaluated.
59	 * 
60	 * AGFSL(sel,ann).eval(ctx) = NATFS(sel, map eval(ctx) over ann)
61	 * 
62	 * @return a first-class field selection object
63	 */
64	public ATMessage createMessage(ATContext ctx, ATSymbol selector, ATTable evaluatedArgs, ATTable annotations) throws InterpreterException {
65		return new NATFieldSelection(selector,
66				                     annotations);
67	}
68	
69
70	protected ATObject newQuoted(ATSymbol quotedSel, ATTable quotedArgs, ATExpression quotedAnnotations) {
71		return new AGFieldSelectionCreation(quotedSel, quotedAnnotations);
72	}
73	
74	protected String getMessageToken() { return "."; }
75	
76	public NATText meta_print() throws InterpreterException {
77		if (base_annotations() == NATTable.EMPTY) {
78			return NATText.atValue(this.getMessageToken() +
79		               base_selector().meta_print().javaValue);
80		} else {
81			return NATText.atValue(this.getMessageToken() +
82		               base_selector().meta_print().javaValue +
83		               "@" + base_annotations().meta_print().javaValue);
84		}
85	}
86
87}