anchovy.utils.flexibleobject.flexibleobject source code

1 /*
2 Copyright (c) 2013 Andrey Penechko
3 
4 Boost Software License - Version 1.0 - August 17th, 2003
5 
6 Permission is hereby granted, free of charge, to any person or organization
7 obtaining a copy of the software and accompanying documentation covered by
8 this license the "Software" to use, reproduce, display, distribute,
9 execute, and transmit the Software, and to prepare derivative works of the
10 Software, and to permit third-parties to whom the Software is furnished to
11 do so, all subject to the following:
12 
13 The copyright notices in the Software and this entire statement, including
14 the above license grant, this restriction and the following disclaimer,
15 must be included in all copies of the Software, in whole or in part, and
16 all derivative works of the Software, unless such copies or derivative
17 works are solely in the form of machine-executable object code generated by
18 a source language processor.
19 
20 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
23 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
24 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
25 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 DEALINGS IN THE SOFTWARE.
27 */
28 
29 module anchovy.utils.flexibleobject.flexibleobject;
30 
31 import std.variant : Variant;
32 
33 import anchovy.utils.flexibleobject.flexibleproperty : IProperty, ValueProperty;
34 import anchovy.utils.flexibleobject.flexibleaccess;
35 import anchovy.utils.signal : Signal;
36 
37 // Object that can have any number of properties
38 class FlexibleObject
39 {
40 	override int opCmp(Object o) { return cast(int)cast(void*)this - cast(int)cast(void*)o; }
41 
42 	package IProperty[string] properties;
43 
44 	Variant opIndex(string propName)
45 	{
46 		return properties.get(propName, new ValueProperty(this, Variant(null))).value;
47 	}
48 
49 	Variant opIndexAssign(V)(V value, string propName)
50 	{
51 		static if (is(V:IProperty) && !is(V == typeof(null)))
52 		{
53 			return properties[propName] = value;
54 		}
55 		else static if (is(V:Variant))
56 		{
57 			if (auto property = propName in properties)
58 			{
59 				return property.value = value;
60 			}
61 			else
62 			{
63 				return properties[propName] = new ValueProperty(this, value);
64 			}
65 		}
66 		else
67 		{
68 			if (auto property = propName in properties)
69 			{
70 				return property.value = Variant(value);
71 			}
72 			else
73 			{
74 				return properties[propName] = new ValueProperty(this, Variant(value));
75 			}
76 		}
77 	}
78 
79 	Variant opIndexOpAssign(string op, V)(V value, string propName)
80 	{
81 		IProperty property = properties.get(propName, new ValueProperty(this, Variant(null)));
82 
83 		mixin("property.value " ~ op ~ "= value;");
84 
85 		return property.value;
86 	}
87 
88 	Variant remove(string propName)
89 	{
90 		Variant result = properties.get(propName, new ValueProperty(this, Variant(null))).value;
91 
92 		properties.remove(propName);
93 
94 		return result;
95 	}
96 
97 	IProperty property(string propName)
98 	{
99 		if (propName !in properties)
100 		{
101 			properties[propName] = new ValueProperty(this, Variant(null));
102 		}
103 
104 		return properties[propName];
105 	}
106 }