1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Threading;
namespace ICSharpCode.NRefactory
{
/// <summary>
/// Represents the role a node plays within its parent.
/// </summary>
public abstract class Role
{
public const int RoleIndexBits = 9;
static readonly Role[] roles = new Role[1 << RoleIndexBits];
static int nextRoleIndex = 0;
readonly uint index;
[CLSCompliant(false)]
public uint Index {
get { return index; }
}
// don't allow NRefactory consumers to derive from Role
internal Role()
{
this.index = (uint)Interlocked.Increment(ref nextRoleIndex);
if (this.index >= roles.Length)
throw new InvalidOperationException("Too many roles");
roles[this.index] = this;
}
/// <summary>
/// Gets whether the specified node is valid in this role.
/// </summary>
public abstract bool IsValid(object node);
/// <summary>
/// Gets the role with the specified index.
/// </summary>
[CLSCompliant(false)]
public static Role GetByIndex(uint index)
{
return roles[index];
}
}
/// <summary>
/// Represents the role a node plays within its parent.
/// All nodes with this role have type T.
/// </summary>
public class Role<T> : Role where T : class
{
readonly string name; // helps with debugging the AST
readonly T nullObject;
/// <summary>
/// Gets the null object used when there's no node with this role.
/// Not every role has a null object; this property returns null for roles without a null object.
/// </summary>
/// <remarks>
/// Roles used for non-collections should always have a null object, so that no AST property returns null.
/// However, if a role used for collections only, it may leave out the null object.
/// </remarks>
public T NullObject {
get { return nullObject; }
}
public override bool IsValid(object node)
{
return node is T;
}
public Role(string name)
{
if (name == null)
throw new ArgumentNullException("name");
this.name = name;
}
public Role(string name, T nullObject)
{
if (name == null)
throw new ArgumentNullException("name");
if (nullObject == null)
throw new ArgumentNullException ("nullObject");
this.nullObject = nullObject;
this.name = name;
}
public override string ToString()
{
return name;
}
}
}
|
