opensim-development – Blame information for rev 1

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1 eva 1 /*
2 * Copyright (C) 2007-2008, Jeff Thompson
3 *
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * * Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * * Neither the name of the copyright holder nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
22 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30  
31 using System;
32 using System.Collections.Generic;
33  
34 namespace OpenSim.Region.ScriptEngine.Shared.YieldProlog
35 {
36 public class Functor1 : IUnifiable
37 {
38 public readonly Atom _name;
39 public readonly object _arg1;
40  
41 public Functor1(Atom name, object arg1)
42 {
43 _name = name;
44 _arg1 = arg1;
45 }
46  
47 public Functor1(string name, object arg1)
48 : this(Atom.a(name), arg1)
49 {
50 }
51  
52 // disable warning on l1, don't see how we can
53 // code this differently
54 #pragma warning disable 0168, 0219
55 /// <summary>
56 /// If arg is another Functor1, then succeed (yield once) if this and arg have the
57 /// same name and the functor args unify, otherwise fail (don't yield).
58 /// If arg is a Variable, then call its unify to unify with this.
59 /// Otherwise fail (don't yield).
60 /// </summary>
61 /// <param name="arg"></param>
62 /// <returns></returns>
63 public IEnumerable<bool> unify(object arg)
64 {
65 arg = YP.getValue(arg);
66 if (arg is Functor1)
67 {
68 Functor1 argFunctor = (Functor1)arg;
69 if (_name.Equals(argFunctor._name))
70 {
71 foreach (bool l1 in YP.unify(_arg1, argFunctor._arg1))
72 yield return false;
73 }
74 }
75 else if (arg is Variable)
76 {
77 foreach (bool l1 in ((Variable)arg).unify(this))
78 yield return false;
79 }
80 }
81 #pragma warning restore 0168, 0219
82  
83  
84 public override string ToString()
85 {
86 return _name + "(" + YP.getValue(_arg1) + ")";
87 }
88  
89 public bool termEqual(object term)
90 {
91 term = YP.getValue(term);
92 if (term is Functor1)
93 {
94 Functor1 termFunctor = (Functor1)term;
95 return _name.Equals(termFunctor._name) && YP.termEqual(_arg1, termFunctor._arg1);
96 }
97 return false;
98 }
99  
100 public bool lessThan(Functor1 functor)
101 {
102 // Do the equal check first since it is faster.
103 if (!_name.Equals(functor._name))
104 return _name.lessThan(functor._name);
105  
106 return YP.termLessThan(_arg1, functor._arg1);
107 }
108  
109 public bool ground()
110 {
111 return YP.ground(_arg1);
112 }
113  
114 public void addUniqueVariables(List<Variable> variableSet)
115 {
116 YP.addUniqueVariables(_arg1, variableSet);
117 }
118  
119 public object makeCopy(Variable.CopyStore copyStore)
120 {
121 return new Functor1(_name, YP.makeCopy(_arg1, copyStore));
122 }
123 }
124 }